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1-26
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Table 9. U.S. Printing Industry Forecast 1990 to 2000
Industry Segment
Magazines and Other
Periodicals
Catalogs and Directories
Direct Mail
Labels and Wraps
Inserts and Coupons
Other Advertising arid Free
Circulation Papers
Annual Reports and Related
Products
Business Forms
Business Communications
Manuals and Technical
Documentation
Quick Printing
Books
Printing Trade Services
Industry
Forecast
Annual Percent
Growth 1990 - 2000*
2
3
5
0
3
3
4
6
2
4
8-9
4
1
2
-2
5
1
3
5
2
3
0
8
2
4
3.8 - 5.3
* Based on constant 1988 dollars.
Source: SRI 1990.
A number of major more traditional areas of printing are
expected to grow at well below the industry average during the
decade. Book printing and business form printing are expected to
experience growth of only one to two percent annually while the
printing of magazines and other periodicals is expected to increase
by two to three percent per year (SRI 1990).
1. Magazine and Periodical Publishing
Growth in the magazine and other periodicals market
is expected to average two to three percent annually through the
end of the decade. The outlook in the market is for a greater
number of titles, shorter press runs per title, and greater
emphasis on local and regional editions of national magazines as
well as the personalization of advertising. Offset printing will
continue to dominate this market (SRI 1990).
2. Catalogs and Directories
During the 1990s, growth in the catalogs and
directories' market is expected to average three to four percent
1-27
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annually. Rising distribution costs and. competition from other
^advertising media will result in the consolidation of Catalog firms
as they seek lower production costs and alternative methods of
product delivery (SRI 1990) . '
The strongest growth in the market during the decade will be
for business-to-business catalogs (e.g., office supply catalogs).
Overall there should continue to be moderate growth in the mail-
order catalog segment of the market although the number of
specialty catalogs published will decline. Due to increased
postage costs, catalogs distributed through the mail will be
smaller and use lighter papers. (SRI 1990).
Directory printing is expected to increase over the next few
years. Growth will be fueled primarily by the demand for local
directories and abridged versions of large directories . Demand for
large business directories will grow but at a slower rate than
before (SRI 1990) .
3. Direct Mail
Direct mail is expected to be one of the fastest
growing areas in the printing industry during the 1990s. It is
anticipated that growth in the industry will average five to six
per cent annually. Major changes will occur in the direct mail
printing business segment by the year 2000. The industry will
consolidate through acquisitions and specialization. The direct
mail printer will see the number of jobs increase. However,
production runs will be smaller as mailing lists are continuously
refined to target select groups. Growth in telecommunications
technologies will permit a greater level of direct contact between
the customer and the printer, thus allowing for more .revisions and
faster turnaround of direct mail materials. In response to
customer demand for more frequent revisions and faster turnaround,
the industry- will make increasing use of in-line printing (SRI
1990) .
4 .
Labels and Wraps
The labels and wraps segment of the printing market
is expected to experience an average annual rate of growth of
between zero and two percent during the 1990s, one of the lowest
rates in the industry. This weak growth will result from the
decline in the growth of the number of packaged goods . However, a
greater variety of package sizes will result in more but shorter
production runs. To meet customers needs, label and wrap printers
will have to provide greater customization, higher quality images,
and the ability to work with more complex materials.
1-28
-------
5. Advertising Inserts, and Coupons
The advertising inserts and coupons segment is
expected to grow between three and four percent annually during the
1990s, a rate somewhat lower than that anticipated for the printing
industry as a whole. Printers specializing in advertising inserts
and coupons may lose market share to daily newspapers who are
expected to compete for this type of business in order to keep
their large flexographic presses operating at near capacity.
Competition can also be expected from operators of non-heatset
offset presses, another area where overcapacity exists (SRI 1990}.
6. Other Advertising and Free Circulation Papers
During the 1990s this market segment is expected to
be the industry growth leader with an expected annual growth rate
of eight to nine percent. "Other advertising" refers to printed
advertising other than direct mail and coupons and inserts.
Examples include booklets, brochures, and circulars directly
distributed to consumers. Printers of other advertising materials
will be influenced by the need for smaller, specialized production
runs as well as by the need for a greater variety of products,
especially materials tailored to sell to a specialized audience.
Advertisers will insist on the increased use of color and
distinguishing features in their advertising. Quick printers will
put economic pressures on larger printers as they attempt to
capture a larger portion of this market for themselves (SRI 1990).
Free circulation papers, currently produced primarily by small'
local printers-, are expected to experience moderate growth into the
late 1990s. However, during the decade this market will
increasingly attract the interest of large printers, and, as a
result, small local companies will see their share of the market
decline. Growth and increasing competition in the free circulation
paper market will require printers to use more color and to improve
the overall quality of their product. Furthermore, printers will
make increasing use of flexographic presses instead of the non-
heatset offset presses that now dominate printing in this market
(SRI 1990).
7. Annual Reports
During the 1990s, growth in the annual reports
market is expected to average four to five percent annually.
Because corporate clients are extremely conscious of the image
portrayed by their annual reports, this segment of the_printing
industry continually pushes the industry as a whole to higher and
higher standards in color production. Most commercial printers
avoid this highly specialized, demanding area of business.
Presently, there are only about 30 large printing firms involved in
1-29
-------
producing annual reports and the number of companies in this market
segment is not expected to show any marked change over the next ten
years (SRI 1990).
8. Business Forms
At one to two percent annually, growth in the
business form printing market will be well below growth in the
printing industry as a whole during .the nineties. A growing number
of small and medium-sized printers are expected to enter this
market where they will be competitive with larger firms when small
to medium volume runs are required. However, the growing ability
of personal computers equipped with laser printers to generate
forms on demand could potentially result in loss of market share by
both large and small printers (SRI 1990).
9. Business Communication
During the 1990s, growth in the business
communications printing market (e.g., preprinted letterhead,
envelopes and memo forms) is expected to average two to three
percent annually. Growth in demand for business communications
products will decline due to: the growing versatility of
telecommunications technology (E-mail, voice mail, etc.) reducing
the . need for printed business communications materials; high
quality computer driven electrostatic and ink-jet printers,
facsimile machines, and color copiers allowing businesses to
produce much of this material in-house; and cost conscious
businesses making greater use of generic printed products such as
memo pads and phone message pads (SRI 1990).
• ' •''','. • ', V ! ': '• v,!V''v''t : ' ' '•'" •'•'K.V''' .';! '
10. Manuals and Technical Documentation
This is the only printing market sector that' may'
actually experience negative growth during the 1990s. During the
decade the market for manuals and technical documentation is
expected to decline by as much as two percent annually or, at best,
to remain flat. The largest client of this market has been the
U.S. government, particularly the Department of Defense. The two
major factors affecting this market are: 1) reduction in the U.S.
defense budget and 2) the development of the DOD Computer Aided
Logistics System (CALS) which will provide on-line access to
technical documentation, engineering drawings, parts lists, and
other pertinent data. With fewer new defense systems procurements,
the demand for technical manuals is declining and will continue to
decline unless the present world political situation changes
dramatically (SRI 1990).
1-30
-------
11. Convenience or "Quick" Printing
Convenience or quick printing will be one of the
major growth areas of the printing industry during, the 1990s..
Growth in the market ,is expected to be. between five and eight
percent annually. Quick printers are distinguished not so much by
a particular printing technology as by a commitment to very fast
job turnaround. Traditionally, quick printers relied primarily on
xerographic reproduction; however, many now employ presses,
especially small sheetfed lithographic presses, or act as brokers
for full-service printers (SRI 1990). ,
Quick printers will capture a growing share of business that
previously would have gone to small- and medium-size commercial
printers. Traditional printers have long 'been able to provide
higher quality products than the average quick printer. However,
new equipment that allows" the delivery of higher quality products
coupled with a growing demand for rapid turn-around by cost-
conscious clients has increased the market for quick printing
services. Many quick printers also offer consultation, design,
composition, and desk-top publishing services. They use personal
computers, -electronic mail, and facsimile to communicate directly
with their customers. The market share for quick printers will
continue to grow well into the late 1990s as additional new
technologies come on line. These new systems will result in lower
production costs and will help quick printers remain very
competitive with traditional printers, particularly in the low-end
color printing market (SRI 1990).
Appendix D lists the top 100 North American quick printing
operations for 1990.
12. Books
Growth in the book printing market is expected Jto be
very slow in the 1990s, averaging only one to two percent annually.
Publishers will pressure printers to reduce production costs in
order to keep the retail price of books as low as possible. _The
number of book printers has declined by more than 40 percent since
1977; even greater consolidation in the industry will occur over
the next few years as more and more medium to large capacity
printers are squeezed out of the market. This _ will open
opportunities for smaller book printers to enter the industry in
support of small, specialized publishers who have a need for short
runs. However, improvements in technology will produce less waste
and reduce labor requirements, thus making short run jobs more
attractive to large printers (SRI 1990).
1-31
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-------
PART TWO:
PRINTING PROCESS PROFILE
-------
-------
I.
PRINTING PROCESSES OVERVIEW1
This section presents a preliminary identification of the use
clusters in the printing industry. 'These use clusters define sets
of competing chemicals, processes, and technologies used in the
industry and identify the environmental and health considerations
associated with the members of each set. The use cluster approach
allows risk evaluations to be performed on all members of the
cluster and facilitates the development of risk reduction
strategies by identifying viable substitute chemicals, processes,
and technologies.
The printing industry is a very diversified and sophisticated
industry owing to the multiplicity of printing processes utilized.
These processes include lithography, gravure, flexography,
letterpress, and screen printing, as well as a number of more
recently developed plateless printing processes. According to
Michael Bruno's Status of Printing, lithography, gravure, and
flexography are the dominant processes, accounting for more than 83
percent of total U.S. printing industry output. Lithography alone
accounts for nearly 50 percent of all domestic output. The
importance of letterpress,, until the 1940s the dominant printing
process, is declining very rapidly and is being replaced by
lithography and flexography. The various plateless printing
processes are gradually becoming a major force in the industry
because of their relative ease of use and the growing application
of computer controlled printing operations. In 1991, the plateless
processes accounted for only about three percent of total U.S.
printing industry output. However, these processes are forecast to
have a 21 percent market share by 2025 (Bruno 1990, 1991).
Industry trends are summarized in Figure 8.
Some of the printing processes have several major subprpcesses
based primarily on the types of substrate or products printed.
Lithography is divided into three subprocesses: sheetfed offset,
heatset web offset, and non-heatset web offset. Gravure includes
publication gravure, packaging gravure, and product gravure.
Flexography consists of publication flexography and packaging
.flexography. The various plateless printing processes, all
comparatively new technologies, include: electronic printing, ink
1 Except where otherwise noted, the description of prepress, press, and
postpress operations is a synthesis of information from the following sources:
Adams 1988; Field 1980; Kirk-Othmer 1982; McGraw-Hill 1987; SRI 1990. Please see
the Bibliography for full citations.
2-1
-------
Trends In Printing Technologies
1991-2025
Market Share
60%
50% -
40% -
30%
20% -
10% -
Lithography Gravure Flexography Letterpress Screen Plateless
Process
" ' i i
,L • t: • ' '
• '• ' :: '•<' i
••1991 £232025
Figure 8. Trends in Printing Technology
(Source: Bruno 1990, 1991)
2-2
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jet printing, magnetography, ion deposition printing, direct charge
deposition printing, and the Mead Cycolor Photocapsule process
(Bruno 1991).
Each of the printing processes can be divided into three major
steps: prepress, press, and postpress. Prepress operations
encompass that series of steps during which the idea for a printed
image is converted into an image carrier such as. a printing plate,
cylinder or. screen. Prepress operations include,composition and
typesetting, graphic arts photography, image assembly, and image
carrier preparation. Press refers to actual printing operations.
Postpress primarily involves the assembly of printed materials and
consists of binding and finishing operations. Figure 9 presents a
flow chart of the typical steps in the printing process.
Within each process, a variety of chemicals are used.
Prepress operations typically involve photoprocessing chemicals and
solutions. Inks and cleaning solvents are the major types of
chemicals used during press operations. Postpress operations can
use large amounts of adhesives, especially where the production of
books and directories is involved. Of all the chemicals used in a
typical printing plant, inks and organic cleaning solvents are the
categories ordered and used in the largest quantities. Many of the
chemicals used in the printing industry are potential hazards to
human health and the environment. Occupational exposure to many of
these chemicals are currently regulated by the U.S. Occupational
Safety and Health Administration (GATF 1992b).
Extremely limited information was found on the volume of
chemicals, especially specific-chemicals, used in the printing
industry. As noted above, inks and cleaners are the chemical
products used in the largest quantities by the printing industry.
No data on the quantity of cleaners used in the industry was found,
however, information on volumes of ink and ink raw materials was
available.
In 1991, the U.S. market for printing ink was 1.9 billion
pounds. The market is expected to grow at an average annual rate
of 2.2 percent through 1996 when the domestic market for printing
is expected to total almost 2.2 billion pounds. Additional
information on the 1991 and estimated 1996 U.S. market for ink by
printing process is presented in Table 10. .
Table 11 shows the estimated amount of solvents, resins>
pigments, and additives consumed in the domestic production of
printing inks.
With the exception of image carrier preparation, prepress
operations .are similar for the five major printing processes.
Therefore, prepress operations, including a general overview of
image carrier preparation, are discussed below in Section II. No
discussion of prepress activities is included for the plateless
2-3
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DESIGN
MANUSCRIPT
PREPARATION
ART
PREPARATION
TYPOGRAPHY
PHOTOGRAPHY
COMPOSITION
GRAPHIC ARTS
PHOTOGRAPHY
J
STRIPPING
& FILM
COMPOSITION
IMAGE CARRIER
PREPARATION
(PLATE/CYLINDER/
SCREEN)
-Prepress
PRINTING'
-Press
BINDING
FULFILIiMENT
-Postpress
Figure 9. Flow Chart of a Typical Printing Process
(Source: Field 1980).
2-4
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Table 10. U.s; Market for Printing Inks (millions of pounds)
Printing
Process
Lithographic
Gravure
Flexographic
Letterpress
Other
Total
1991
836
477
363
154
110
1,940
1996
946
. 528 '
441
101
141
2,156*
Average Annual
Growth Rate
1991 - 1996
( Percent )
2.5
2.0
4.0
-8.0
5.0
2.2
* Column does not add .due to rounding
Source: SRI 1993
2-5
-------
Table 11. Estimated Domestic Consumption of Raw Materials
for Printing Inks, 1991
Raw Material
Hydrocarbon and Oxygenated
Solvents
Resins
Rosin Esters & Adducts
Metallized Rosin
Hydrocarbon Resins
Alkyds
Acrylics
Nitrocellulose
Polyamides
Miscellaneous2
Resin Subtotal
Oils
Pigments
Additives
Total
Millions of
Pounds
6601
132
106
99
33
55
2
15
44
486
363
330
66
1,905
Percent of
Total
35
7
6
5
2
3
0.1
1
2
26*
19
17
3
100
* Subtotal does not add due to rounding
1 Printers use an additional 495 to 660 million pounds of solvents
at press side to dilute inks supplied by the manufacturer in
concentrated form.
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2 Includes polyurethanes, cyclized rubber, shellac, casein,
melamines, and others
' ' , .'•'.•:' ":k ' '• '." "it": •'?''• ; ''•:.. >. •• :! ," •'• .• • <,i
Source: SRI 1993.
2-6
i* '•;!,' !'•,!!:"i '',: /ifiM,',„:,.air1
-------
processes because in -these processes almost all preparatory steps
are accomplished using computers. Section_ III presents a
description of image carrier preparation and printing for each of
the five major printing processes. This section also includes
brief discussions of a number of plateless printing processes.
Because the use of chemicals is most extensive_ during image carrier
preparation and printing operations, the chemicals used throughout
the entire printing process (i.e., pre- through postpress) are
discussed in this section. Postpress operations, fairly similar
for all printing processes, are described in Section IV. Section
V discusses technological trends in the printing industry.
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II. PREPRESS OPERATIONS
A. Introduction
Prepress consists of those operations required to convert
the original idea for a printed image into a printing plate or
other image carrier. Prepress steps include composition and
typesetting, graphic arts photography, image assembly, and image
carrier preparation. With the exception of image carrier
preparation, the prepress process is similar for the five major
printing processes. Plateless process.do most of the prepress
steps using a computer.
B. Typesetting and Composition
During composition, text, photographs and artwork are
assembled to produce a "rough layout" of the desired printed image.
The rough layout is a detailed guide used in the preparation of the
paste-up or camera ready copy from which an image carrier can be
produced.
Traditionally, rough layouts and pasteups were composed by
hand using: drafting boards; light tables; various paste-up tools
such as technical pens, rulers, and cutting tools; and adhesives.
The text used in the paste-up was typeset and printed mechanically.
However, composition has changed dramatically with the advent
of computers. Both type and artwork can be generated and edited
using computers. Computer systems can be equipped with both
optical character recognition and photographic image scanners and
digitizers so that pretyped material and photographic images can
easily be incorporated into the document being composed. With the
systems now becoming available, the computer can directly drive the
typesetting and image carrier preparation processes once the page
or entire document is laid out and ready for printing.
Typesetting operations assemble the' type characters into
pages. There are a number of methods of typesetting including
manual assembly of pieces of metal type, mechanical assembly of
lines of type, and phototypesetting. Until the 1950s, the majority
of typesetting was performed using the Linotype machine which
produces a "slug" or line of type from molten metal. Similar
machines produced single characters of type. Today
phototypesetting devices have almost completely replaced manual and
mechanical methods of typesetting.
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Phototypesetting devices, first demonstrated in the late
nineteenth century, were introduced commercially in the_ early
1950s. They rapidly overtook the Linotype and similar machines in
importance. In phototypesetting, individual type characters or
symbols are exposed onto photographic film or paper. In early
• 2-8
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mechanical photo-typesetting units, entire fonts of characters were
stored as negatives on film. In the later generations of computer-
driven phototypesetters, the image, is generated electronically,
and, in the latest generation of units, a laser is used to project
the image onto the photographic film or paper. Phototypesetting
produces high contrast, high resolution images ideal for printing
purposes. Other computer driven output devices, which include
strike-on, line, ink-jet, and laser printers, do not currently
produce images of sufficient quality for use in large-scale
commercial printing purposes though they are used extensively in
in-plant printing applications.
C. Copy Assembly and Process Photography
Copy assembly consists of bringing all original work
(text, pictures, and illustrations) together and preparing
photographic images. * The photographic images are in the form of
either positive or negative films and are used for photomechanical
image carrier preparation. Copy must be set up correctly to ensure
the finished image carrier will produce a high quality print.
Assembled copy that is ready for the photographic process is called
a flat. When copy of various sizes and shapes is assembled for
transfer to film the process is called image assembly or stripping.
The printing industry depends heavily on the use of highly
specialized photographic equipment, methods, and materials to
produce hi-gh quality printed material. Process photography refers
to the photographic techniques used in graphic arts. Prior to the
'invention of electronic page making systems, virtually all printing
processes employed photomechanical methods of making image
carriers.
Two important types of photography used in the preparation of
image carriers are line and halftone photography. Neither of these
processes can be used to print a true continuous-tone photograph
(i.e., a photograph with intermediate or graduated tones) though
halftone can -achieve the illusion of continuous tones.
Letterpress, lithography, screen printing and some gravure methods
involve both these, types of photography.
Line photography is used to produce high contrast images on
film. Image areas on the film are solid black; • little or no
illusion of intermediate tones can be achieved with this method.
As noted above, by using halftone photography the illusion of
intermediate tones can be achieved for letterpress, lithography,
lateral dot gravure, and screen printing. In halftone photography,
continuous-tone images are broken down into high-contrast dots of
equal density but varying sizes and shapes. (Depending upon the
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type and quality'Of printing being done, the density of dots varies
from 24 to 120 per centimeter). If, forexample, very small dots
are used in one area of aij image, that area appears to be lighter
than those areas of the image where larger dots are used. This
occurs because more of the lighter color substrate remains visible
in the areas where the very small dots are used.
D.
Image Carrier Preparation
Some form of image carrier is used in each of the five
printing processes that now dominate the industry. The image
carrier, often a plate, is used to transfer ink in the form of the
image to the substrate. The image carrier must pick up ink only in
the areas where ink is to be applied to the final image on the
substrate, It must also reject ink in the areas of the. image where
it is not wanted. Figures 10 and 11 describe the basic principles
of the image carriers used for the major printing processes.
Relief plates used in letterpress and flexographic printing
have raised areas that pick ink up from the inking source. Non-
printing areas are recessed below the level of the inking rollers
and therefore are hot coated with ink.
iif . •, • , , | ., ,,-! , ; : | ||
The reverse of a relief plate, the printing areas of a gravure
image carrier are recessed below the level ofthe non-printing
areas. The depressions, referred to as cell's, pick up small
amounts of ink as they pass through an ink fountain. The ink is
then passed to the substrate from the cells. The surface of the
plate is constantly'scraped clean with a doctor blade so that no
ink_is retained except in the cells. Most gravure presses use a
cylindrical image carrier, although some sheet-fed gravure presses
and intaglio plate printing presses use a flat plate.
Planographic plates, used in offset lithography, 'have both the
•image and non-image areas on the same-plane. The image and non-
image areas of the plate are each defined by differing
physicochemical properties. ' The image areas are treated to be
hydrophobia (water-repellant) and oleophilic (oil receptive). Ink
will adhere to these areas„ . The non-image areas, on the other
hand, are treated to be hydrophilic (water loving), and will hot
accept ink. ,
The image carrier in screen printing consists of a porous
screen. A stencil or mask of an impermeable material ,is overlaid
on the screen to create the non-image area. The image is printed
by forcing ink through the stencil openings and onto the substrate.
The stencil openings determine the form and dimensions of the
imprint produced.
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PLATE TECHNOLOGIES
RELIEF PRINTING
The image area is raised above the non-image area
Examples include letterpress and flexography
• ' .•/.-''
PLANOGRAPHIC PRINTING
The image and non-image areas are on the same plain
The image and non-image areas are defined by differing physicochemical
properties
Lithography is a planographic process
INTAGLIO PRINTING .
The image area is recessed and consists of etched or engraved cells of
differing sizes and/or depths
Gravure is an intaglio process
SCREEN PRINTING
The image area consists of a porous screen defined by a stencil of a non-
porous material. .
PLATELESS PROCESSES
Electronic
Magnetographic
Ion-Deposition
Mead Cycolor Photocapsule
Electrostatic
Thermal
Ink-Jet
Figure 10. Image Carrier Technologies
.2-11
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Relief (letterpress)
plate •
-impression surface
' paper
ink
* raised printing surface
Intaglio (gravure)
m //.
plate-
impression surface
paper
recessed ink cups
Planography (lithography)
plate ^ water-receptive surface coating
impression surface
paper
ink
ink-receptive plate
1 I
Stencil
(screen)
squeegee blade
ink
-screen
-paper
- impression surface
Figure 11. Image Carriers (Source: Field 1980. Reproduced
by permission of Ayer Company Publishers, Inc.)
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The primary method of image carrier preparation is the '
photomechanical process where a printing image is produced from a
photographic image. Typically, with this process, a light
sensitive coating is applied to a plate or other type of image
carrier. The plate is then exposed to a negative or positive of a
photographic image. The exposed plate then _ undergoes further
processing steps. The individual photomechanical image carrier
preparation processes are described in greater detail below. •
There are other methods of image carrier preparation: manual,
mechanical, electrochemical, electronic, and electrostatic. Some
of these processes, such as the manual and the mechanical
processes, are of little or no commercial importance. Other
processes, such as trie electromechanical preparation of gravure
cylinders, are discussed below where relevant.
1. Photomechanical Image Carrier Preparation
Photomechaniccil image carrier preparation begins
with a plate, cylinder or screen that has been treated with a
light-sensitive coating. (The types of light-sensitive coatings
used are discussed in the following section.) The coated plate is
exposed to light that has first passed through a transparent image
carrier such as a film positive or negative ^ The exposed plate is
then processed to produce a plate with defined printing and non-
printing areas. Typically, the exposed areas on the plate are
resistant to the developing solutions used to process the plate,
though in some cases the opposite is true. In either case, during
processing the soluble areas of the coating are washed away while
the insoluble areas remain on the plate. ,
~ At this point image carriers produced from film negatives are
essentially finished. The insoluble areas of coating remaining on
the plate become the ink carrier during printing. Letterpress
plates and lithographic surface plates are produced this way.
With image carriers made from film positives, the insoluble
coating serves as a protective barrier during a further processing
step called etching. The coating on this type of image carrier is
often referred to as a "resist" because it resists the acid used to
etch the plate surface. Image carriers produced by this method are
used in lithography, gravure, and screen printing.
2. Light-sensitive Coatings
The three most important light-sensitive coatings
used on image carriers are photopolymers, diazos, and bichromated
colloids. Each of these coatings are discussed in more detail
below. Silyer-halide and electrostatic coatings are used
infrequently ."for special purpose plates used in duplicating
equipment.
' 2-13
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a. Photopolymeric Coatings
,'•'"' ''",'"',''« *
Today, most image carriers are made using any
of a number of different types of photopolymeric coatings. These
coatings are characterized by the type of reaction they undergo
upon exposure to light: photopolymerization, photocrosslinking,
photoarrangement, and photodegradation. A well known example of a
photopolymer coating is Kodak Photo Resist (KPR), a
photocrosslinking polymer, which is used in image carrier
preparation for all major printing processes as well as in the
preparation of printed circuit boards.
Depending on the type of image carrier being produced, the
hardened photopolymer coating may remain oh the image carrier as
either the image or non-image area following processing.
Photopolymer coatings are characterized by wearability, temperature
and humidity stability, and long storage life. Some also exhibit
good solvent resistance. For example, if baked prior to ,use,
lithographic plates produced using photopolymer coatings can be
used for press runs in excess of one million impressions.
b. Diazo Coatings
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Diazo coatings, introduced in the printing
industry around 1950, are used primarily for coating both
presensitized and wipe-on lithographic surface plates . For
presensitized plates, the diazo coating is applied by a machine
called a whirler which spreads the coating on the rotating plate ,
With wipe-on plates the coating is applied by the platemaker with
a sponge or a roller applicator instead of by the usual whirler
method. Diazo coatings are very thin and susceptible to abrasion
and wear during the printing run and generally are used for short
press runs of 75,000 impressions or less. However, pre-lacquered
plates, plates supplied by the manufacturer with a lacquer
impregnated in the plate coating, offer superior abrasion
resistance and can be used for press runs in excess of 100,000
impressions. Most diazo plates have negative-process coatings,
though positive process coatings are also usedl Diazo coatings
are used to presensitize deep-etch and bi -metal plates .
Additionally, diazo is used to sensitize some colloid coatings .
The diazo resin most often used for plates is the condensation
product of 4-diazodiphenylamine salt with formaldehyde. Diazo
oxides such as pyridol [l,2-a]benzimidazol-8-yl-3 (4H) -diazo-4 (3H) -
oxo-1-naphthalenesulfonate are also used (Kirk-Othmer) .
' ' ' ''
, . , . , . , . ,
Diazos are not usually affected by temperature and relative
humidity and have a relatively long storage life. They can be
processed by automatic plate processing machines which speed up
production and result in much higher quality plates than manual
methods. Automatic processing equipment can perform plate coating
2-14 ....... ' ............. ' ..................................... ............ - ..... .....
-------
•and exposure all in one continuous process.
used extensively in newspaper printing.
These machines are
c. Bichromated Colloid Coatings
Bichromated colloid coatings were widely used
until the early 1950s; limited use continues today. They consist
of a light sensitive bichromate and a collodion. The bichromate of
choice is ammonium bichromate, with potassium bichromate used in
special processes such as collotype. A collodion is an organic
material that is capable of forming a strong continuous coating
when applied to the image carrier. Collodions used for
photoengraving are shellac, glue, albumin, and polyvinyl alcohol.
Albumin, casein, alpha protein, polyvinyl alcohol, and gum arable
are used for lithography. Gelatin is used mostly for gravure,
screen printing, and collotype. The colloid is formed when the
finely divided bichromate and the collodion are mixed. Applied to
the image carrier and exposed to light, the colloid forms an
continuous, -insoluble coating. . - ,
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III. IMAGE CARRIER PREPARATION AND PRESS OPERATIONS
A. Lithography .
1. Lithographic Platemakinq
Lithography uses a planographic plate, a type of
plate on which the image areas are neither raised nor indented
(depressed) in relation to the non-image areas. Instead the image
and non-image areas, both on essentially the same plane of the
printing plate, are defined by differing physicochemical
properties.
Lithography is based on the principal that oil and water do
not mix. Lithographic plates undergo chemical treatment that
render the image area of the plate oleophilic (oil-loving) and,
therefore, ink-receptive and the non-image area hydrophilic (water-
loving) . During printing, ink is applied to the oleophilic image
area of the plate. Water applied to the hydrophilic area of the
plate prevents ink from migrating into the non-image area. During
printing operations water is applied-to the plate by a dampening
system. The water is applied in the form of a fountain solution
which consists primarily of water with small quantities of chemical
additives intended to lower the surface tension of the water and
control pH. Traditionally, isopropyl alcohol was used to control
surface tension but in recent years it has been largely replaced by
glycol ethers, especially 2-butoxy ethanol. This substitution was
motivated by a variety of factors, including concerns about
isopropyl. alcohol's possible health' effects, market pressures to
reduce VOC emmissions, and regulations requiring reductions in VOC
emmissions (Buonicore; DeJidas).
Surface, deep etch, and bi-metal plates, the are three main
types of plates used in lithographic printing today, are
categorized according to how the printing and non-printing areas
are formed. The type of plate used by-the printer depends largely
on the length of the press run. Surface plates, the least durable
of the three types of'plates, are used for shortruns; deep-etch
for runs requiring up to 400,000 impressions; and bi-metal plates
for runs requiring up to several million impressions.
a. Surface Plates
Surface plates are made with an aluminum base
metal treated with a naturally oil-receptive, light-sensitive
coating. During processing, the coating is exposed to light
through a photographic negative or positive, thus rendering the
image on the plate. The coating is then removed from the non-image
areas making them water-receptive. These plates are used mainly
for short runs due to their poor wear properties. However,
.'. T
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2-16,
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applying a layer of lacquer to the image area substantially
increases the number of copies that can be printed.
b.
Deep-etch Plates
Deep-etch plates also have a water receptive
coating on a base-metal of aluminum. Images are created on the
plates by creating an oxide coating on the plate in the image
areas, then applying an image bearing coating that adheres to the
oxide and not to the base metal. The image becomes slightly
countersunk during the processing. These plates are characterized
by their long runs, usually in excess of 100,000 impressions. For
runs of greater than 400,000 these plates can be copperized or
anodized.
' c. Bi-Metal Plates
Bi-metal plates take advantage of the affinity
of some metals for ink and of others for water. For example,
copper and brass are ink receptive while metals such as chromium,
aluminum, and stainless steel have an affinity to water. Bi-metal
plates are made of two electroplated metal layers. Once processed,
the ink receptive metal layer is the image area and the layer -with'
an affinity for water is the non-image area. Copper-surfaced and
chromium-surfaced plates are the two main types of bi-metal plates
produced today. The chromium-surfaced plate is popularly called a
tri-metal plate because it consists of an aluminum base, followed.
by a layer of copper or -brass, and finally a - surf ace layer of
chromium. •
The plates are supplied either presensitized or ready for in-
plant coating. The coating is generally exposed with a negative
when using copper-surfaced plates and -is always exposed - with a
positive when using chromium-surfaced plates. The exposed areas of
the coating forms a hardened stencil that protects the surface
layer of metal. An etching solution is then applied to remove the
unprotected areas of . the surface layer of metal and expose the
underlying layer. On processed copper-surfaced plates, the copper
layer forms the image area and the exposed underlying layer of
aluminum or stainless steel forms the non-image area. On chromium-
surfaced plates, the chromium forms the non-image area and the
exposed underlying layer of copper or brass forms the image area.
Bi-metal plates are very durable and are capable of press runs
ranging into the millions of impressions. •
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2. Lithographic Presses and Printing
" ' ' •••,•• "•• ' ' ." :'. ; I
Lithography is well suited for printing both text:
and illustrations in short to medium length runs of up to 1,000,000
impressions. Feed stock can be either, sheet or web.
There are three basic lithographic press designs: unit-
design, common impression cylinder design, and blanket-to-blanket
design. The unit-design press is a self-contained printing station
consisting of a plate cylinder, a blanketcylinder, and an
impression cylinder. Two or more stations may be joined to perform
multi-color printing. Figure 12 shows a typical layout for a unit--
design press. A common impression cylinder press consists of two.
or more sets of plate and blanket cylinders sharing a common
impression cylinder. This allows two or more colors to be printed
at a single station. A blanket-to-blanket press consists of two
sets of plate and blanket cylinders without an impression cylinder.
The- paper is printed on both sides simultaneously as it passes
between the two blanket cylinders (Field).
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As noted in the introduction, lithography can be divided into
three subprocesses: sheetfed offset, heatset web offset, and non-
heatset web offset. The three subprocessesand the types of
chemicals used in each are discussed below.
; a.
Sheetfed Offset
The sheetfed offset process is used mainly for
relatively short runs in the production of commercial and packaging
products. The inks used go through an oxidatiye polymerization
drying process generating very little fugitive volatile organic
compound (VOC) emissions. The majority of emissions that do occur
are from the VOCs in the circulating fountain solutions and
solvents used in cleaning presses, blankets , Ink fountains, and
rollers. Major categories of chemicals used in the sheetfed offset
process include film developers and fixers, inks, blanket and
roller washes, and fountain solution concentrate. Isopropyl alcohol
is widely used in fountain solutions though alcohol substitutes are
also available (GATF 1992b) . A process flow diagram as well as
information on the chemicals used in this process are presented in
Figure 13 . ..... ' ......... ' ........... "" '"
b. Heatset Web Offset
The heatset web offset process is used
primarily for long jobs at high speed (up to 40,000 impressions per
hour) for the production of magazines, other periodicals, and
catalogs. "Web" refers to the continuous sheets of paper, supplied
in roll form, that are used in this type of printing. The web is
cut into individual pages or sheets only after printing. Inks used
2-18
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da/npening-
solution
fountain V
plate _
cylinder
ink fountain
feed
pile
impression
cylinder
additional units
for multicolor
printing
pile
Figure 12. Simplified Lithographic Press Layout
(Source: Field 1980, Reproduced by permission
of Ayer Company Publishers, Inc.)
' 2-19
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SHEETFED OFFSET OPERATION
PROCESS FLOW DIAGRAM
1.
2.
3.
4.
5.
6.
8
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
FILM PROCESSING AND ASSEMBLY
PLATEMAKING
PRESS MAKEREADY
PRINTING, COATING
LAMINATING, EMBOSSING,
BRONZING, STAMPING
DIECUTTING, INSERTING, COLLATING,
FOLDING, STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
PRESS
POSTPRESS
Figure 13. Sheetfed Offset (Source: GATF 1992b)
.2-20
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SHEETFED OFFSET (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive, cleaning solvent
2. Color scanner cleaner, deletion fluid
3. Film developer and fixer, film cleaner, film system cleaner,
image cleaner/preserver, antistatic spray, adhesive
4. Plate developer and finisher, plate toner, plate system cleaner
5/6. Fountain solution concentrate, fountain solution defoamer,
fountain solution additive, isopropyl alcohol, alcohol substitute,
gum arable, phosphoric acid
Sheetfed offset ink, ink preserver, tack reducer
Blanket wash, roller wash, type wash, glaze remover, UV-ink cleaner,
. sheetfed ink remover, plate preserver, roller lubricator, copperizing
solution, rubber rejuvenator, blanket hardener, image remover, metering
roller cleaning solvent
Varnish, UV-varnish, silicone coating
Anti-setoff powder
7. Adhesive, ink, bronze powder, metal foil
8. Adhesive
Specialty operations: ....
Lamination (glue, varnish, plastics)
Stamping (metal foil)
Thermography (polyamide resin)
Cellophane window (glue)
Numbering (ink)
Bronzing (copper/nickel powder)
Figure 13. Sheetfed Offset (continued)
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SHEETFED OFFSET (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Plate developer
Plate finisher/
replenisher
Image preserver
Color proofing
Press
Ink, varnish
Coating
UV-ink
Fountain solution
Major Chemicals Used (Volumes of
Individual Chemical Used Vary Greatly)
Acetone, hexane, 1,1,1-trichloroethane, ethanol,
n-propanol, perchloroethylene, 2-butoxy ethanol,
isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquinone,
potassium sulfite, potassium hydroxide,
butyl-diethanoiamine
Ammonium thiosulfate, sodium acetate, acetic acid,
aluminum sulfate
Benzyl alcohol, diethanolamine, polyvinyl alcohol,
ethylene glycol, acetic acid
Dextrin, mineral spirit, sodium hydroxide,
N-methylpyrrolidone, sodium sulfite, potassium
hydroxide
Stoddard solvent, phosphoric acid
n-Propanol
Petroleum distillates, vegetable oil, resin, rosin,
dryers, pigments containing barium and copper
Polydimethyl siloxane
Acrylates, pentaerythritol tritetracrylates
Isopropanol, 2-butoxy ethanol and other glycol ethers,
gum arabic, ethylene glycol, phosphoric acid .
Figure 13. Sheetfed Offset (continued)
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SHEETFED OFFSET (cont'd)
MAJOR CHEMICALS USED (cont'd)
Operation/Process
Press (cont'd)
Wash solvent/plate
cleaner
Copperizing
solution
Glaze remover
Postpress
Glue
Bronzing powder
Major Chemicals Used (Volumes of
Individual Chemical Used Vary Greatly)
Aliphatic and aromatic hydrocarbons,
mineral spirits, acetone, methylene chloride, xylene,
toluene, glycol ethers, vegetable oils, fatty acids,
surfactants
Ethylene glycol, isopropanol, methylene
chloride
Toluene, methanol, acetone
Paraffin wax
Copper, zinc, aluminum, stearic acid
Figure 13. Sheetfed Offset (continued)
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in this process are dried by evaporating the ink oil, usually with
a recirculating hot air system although direct flame impingement
and infrared drying systems continue in limited use (Buonicore).
Ink oil evaporated and emitted through dryer stacks is a'
potentially significant source of VOC emissions. Major chemicals
used are quite similar to those used, in sheetfed offset (GATF
1992b) . A process flow diagram as well as information on the
chemicals used in this process are presented in Figure 14.
c.
Non-heatset Web Offset
• The non-heatset web offsetprocess is a high
speed process used largely in the production of newspapers,
journals, directories, and forms. The inks used usually do not
require drying, therefore, the VOC emissions generated during the
use of this printing process are quite small. Dampening and inking
systems (including dampening chemistry and ink formulations) differ
significantly from heatset web offset.. The other major chemicals
used in this process, however, are quite similar to those used in
heatset web offset (GATF 1992b) . A process flow diagram as well as
information on the chemicals used in this process are presented in
Figure 15.
3. Volume of Output and Percentage of Total Market
•In 1991 lithographic printing"accounted" for 17
percent of the total value of U.S.printing industry output
(excluding instant and in-plant printing). However, by 2025,
lithography's share of the total U.S. market is expected to decline
to 35 percent, due largely to competition from flexography and the
various developing plateless printing technologies (Bruno 1990,
1991). .
4. Number and Relative Size of Printing Companies
Of a total of 59,636 plants with printing presses,
54,472, or 91.3 percent, have offset lithographic presses: Of the
plants with lithographic presses, about 92 percent have sheetfed
presses and 11 percent have web-fed presses (some plants have both
types of presses) (A.F. Lewis 1991).
As discussed in Section II of this report, the overwhelming
majority of companies in the printing industry are small
businesses. This is especially true in lithographic printing where
about 85 percent of plants with lithographic presses employ fewer
than 20 people and roughly half employ less than five. The
relatively small number of plants with web-fed lithographic
presses, however, tend to be considerably larger. Almost 60
percent of these plants' have more than 20 employees (A.F. Lewis
1991). " _ /" ;\;;;'; ; ." '
2-24 ' ' '" '"' """': '"""""'""'" ' " "'" '""
-------
HEATSET WEB OFFSET OPERATION
PROCESS FLOW DIAGRAM
l.
2.
3.
4.
.5.
6.
7.
8.
9.
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
FILM PROCESSING AND ASSEMBLY
PLATEMAKING
PRESS MAKEREADY
PRINTING, IMPRINTING, COATING
SLITTING, PERFORATING,
CUTTING, FOLDING
PLATELESS PRINTING (INK JET,
LASER PRINTER), STAMPING
INSERTING, COLLATING,
STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
PRESS .
J
POSTPRESS
Figure 14. Heatset Web Offset (Source: GATF 1992b)
2-25
-------
HEATSET WEB OFFSET (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive, cleaning solvent
2. Color scanner cleaner, deletion fluid
3. Film developer and fixer, film cleaner, film system cleaner, image
cleaner/preserver, antistatic spray, adhesive
4. Plate developer and finisher, plate toner, plate system cleaner
5/6. Fountain solution concentrate, fountain solution defoamer, fountain
solution additive, isopropyl alcohol, isopropyl alcohol substitute, gum
arabic, phosphoric acid
Heatset web offset ink, ink preserver, tack reducer, UV-ink
Blanket wash, roller wash, glaze remover, ink remover, plate preserver,
roller lubricator, copperizing solution, rubber rejuvenator, blanket hardener,
image remover, metering roller cleaning solvent
Varnish, silicone coating
7. None
8. Adhesive, ink, metal foil
9. Adhesive
Specialty operations:
Stamping (metal foil)
Laminating (varnish)
Numbering (ink)
Figure 14. Heatset Web Offset (continued)
2-26
-------
HEATSET WEB OFFSET OPERATION (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Plate developer
Plate.finisher/
replenisher
Image preserver
Color proofing
Press
Ink, varnish
Fountain solution
Wash solvent/plate
cleaner
Glaze remover
Postpress
Glue
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Acetone, hexane, 1,1,1 trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy .ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Benzyl alpohol, diethanolamine, polyvmyl alcohol, ethylene
glycol, acetic acid
Dextrin, mineral spirit, sodium hydroxide,
N-methylpyrrolidone, sodium sulfite
Stoddard solvent, phosphoric acid
n-Propanol
Petroleum distillates, vegetable oils, resin, rosin, dryer,
pigments containing barium and copper
Isopropanol, 2-butoxy ethanol and other glycol ethers, gum
arabic, phosphoric acid, ethylene glycol
Aliphatic and aromatic hydrocarbons, mineral spirits, acetone,
methylene chloride, xylene, toluene, isopropanol, glycol
ethers, vegetable oils, fatty acids, surfactants
Toluene, methanol, acetone
Paraffin wax, isopropanol, trichloroethylene, toluene,
ammonia, amines
Figure 14. Heatset Web Offset (continued)
2-27
-------
NONHEATSET WEB OFFSET OPEEATION
PROCESS FLOW DIAGRAM
1.
2.
3.
4
5.
6.
7.
8.
ART DESIGN, ORIGINAL PICTURE /FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
FILM PROCESSING AND ASSEMBLY
PLATEMAKING
PRESS MAKEREADY
PRINTING, IMPRINTING
t
SLITTING, PERFORATING/
CUTTING, FOLDING
-
SHEETING, INSERTING,
LABELING, STAMPING, COLLATING,
STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
PRESS
POSTPRESS
Figure 15. Non-heatset Web Offset (Source: GATF 1992b)
2-28
-------
NONHEATSET WEB OFFSET (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1.
2.
3.
Adhesive, cleaning solvent, glass cleaner
Color scanner cleaner, deletion fluid
Film developer and fixer, film cleaner, film system cleaner, image
cleaner/preserver, antistatic spray, adhesive
4. Plate developer and finisher,, plate toner, plate system cleaner
5\6. Fountain solution concentrate, fountain solution defoamer, fountain
solution additive, isopropyl alcohol, isopropyl alcohol substitute, gum
arable
Nonheatset web offset ink, ink preserver, tack reducer, UV-ink
Blanket wash, roller wash, glaze remover, UV-ink cleaner, sheetfed ink
remover, plate preserver, roller lubricator, copperizing solution, rubber
rejuvenator, blanket hardener, image remover
7. None
8. Adhesive, ink, metal foil
Specialty operations:
Stamping (metal foil)
Thermography (polyamide resin)
Numbering (ink)
Figure 15. Non-heatset Web Offset (continued)
2-29
-------
NONHEATSET WEB OFFSET (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Plate developer
Plate finisher/
replenisher
Image preserver
Press
Ink
Fountain solution
Wash solvent/plate
cleaner
Glaze remover ,
Postpress
Glue
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol alcohol, hexane, acetone
Sodium sulfite, sulfosah'cych'c acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Benzyl alcohol, diethanolamine, polyvhiyl alcohol, ethylene
glycol, acetic acid
Dextrin, mineral spirit, sodium hydroxide,
N-methylpyrrolidone, sodium sulfite
Stoddard solvent, phosphoric acid
Soybean oil and other vegetable oils, hydrotreated & solvent
extracted naphthenic distillates and paraffin oils, alkyds and
other resins, rosin, dryers, clays, carbon black, pigments
containing barium and copper
Isopropanol, 2-butoxy ethanol, gum arabic, dextrin, phosphate
salts, silicates, surfactants, polyols, ethylene glycol,
dipropylene glycol, synthetic cellulose, isopropanol
Aliphatic and aromatic hydrocarbons, ethanol, mineral spirits,
acetone, glycol ethers, vegetable oils, fatty acids
Toluene, methanol, acetone
Paraffin wax, isopropanol, trichloroethylene, toluene
Figure 15. Non-heatset Web Offset (continued)
2-30
-------
B. Gravure
1. Gravure Cylinder Making
Currently, the dominant gravure printing process,
referred to as rotogravure, employs web presses equipped with
cylindrical, copper-clad plates. In gravure printing, the image is
transferred from a sunken surface. The image area o'f a gravure
cylinder consists of a pattern of depressions or cells etched into
the cylinder. Following Etching, the cylinder is completed by the
application of an electroplate of chromium which improves its
durability.
A number of other types of gravure presses are currently in
use. Rotary sheet-fed gravure presses are used when high quality
pictorial impressions are required. They find limited use,
primarily in Europe. Intaglio plate printing presses are used in.
certain specialty applications such as printing currency and in
fine arts printing. - Offset gravure presses are used for printing
substrates with irregular surfaces or on films and plastics.
The cylinders used in rotogravure printing can be from three
inches in diameter by two inch wide to three feet in diameter by 20
feet wide. Publication presses are from six to eight feet wide
while presses used for printing packaging rarely exceed five feet.
in width. Product gravure presses show great variation in size,
ranging from presses with cylinders two inches wide, designed to
print wood grain edge trim, to cylinders 20 feet wide, designed to
print paper towels. - - ' ,
Five different processes, conventional, direct-transfer,
variable-area/variable-depth, laser, and electromechanical, have
been used, to prepare gravure cylinders. The first four use a
chemical process to etch cells .on the cylinder while the fifth
process uses an electronically controlled mechanical process to
engrave cells on the cylinder. Electromechanical engraving has
almost entirely replaced chemical etching iri the preparation of
gravure cylinders. Currently, the electromechanical process is
used to prepare 100 percent of publication gravure cylinders and 95
percent of packaging- and product gravure cylinders. The remaining
five percent of product and packaging gravure cylinders, intended
for various special applications, are prepared either by the direct
transfer or the laser process (Tyszka 1993). The cost of
preparing gravure cylinders using any process is high when compared
to other types of image carriers. The primary advantage of gravure
cylinders is that they have a long service life and will yield a
very large number of impressions without degradation. Each of.the
five processes are discussed in greater detail below.
2-31
-------
a.
Conventional Gravure
The conventional process ofpreparing gravure
cylinders uses either bichromate-sensitized carbon tissue or
special photographic transfer film as the light-sensitive coating
and etchant resist. Carbon tissue consists of a pigmented gelatin
coating on a paper substrate. It is sensitized with a bichromate
solution immediately before it is used. The cylinder preparation
process is the same whether the carbon tissue or photographic film
are used.
I , ' ..I' ' , , • ' ' i| •• " ; I nf '!,! , i , '• ' ' '' ' I .,,!'''••• i1' J' ., 1 , ' ".
During the cylinder preparation process, the resist is exposed
twice using a high intensity ultraviolet light, one time to each of
two different glass positives. The first exposure is through a
continuous-tone positive. The second exposure is through a gravure
screen consisting of transparent lines (150 to 175 per inch) and
opaque dots (Buonicore).
During the first exposure, the bichromated gelatin is hardened
in proportion to the optical density of the positive image. During
the second exposure, maximum hardening of the gelatin occurs in
areas under the transparent lines in the screen while the pattern
of opaque dots prevents hardening in other areas. The sheet of
carbon tissue and hardened .gelatin carrying the image is
transferred to a copper-clad cylinder. Traditionally, the image is
then etched into the cylinder with acid. The more heavily exposed
areas of the gelatin are more resistant to the effects of the acid.
In these areas no etching will occur or only shallow cells will be
etched into th'e copper cylinder. Deeper cells will be etched on
the copper cylinder in areas where the gelatin received less
exposure. The process results in a regular pattern of un-etched
high spots (lands) and cells of varying depths. In the U.S., the
conventional process for gravure cylinder preparation has been
replaced by the electromechanical process.
b.
Direct-Transfer drravure
In the direct-transfer process, photographic
polymer plates replace the glass photo'plates used_ in the
conventional gravure cylinder preparation process. A special wrap-
around positive consisting of a combination of half-tone and
screened solids is used to transfer the image to the cylinder
(Buonicore). The half-tone image is contact printed onto a copper
cylinder that has been treated with a photopolymer emulsion. _The
cylinder is then etched using a process similar to that described
for the conventional gravure cylinder preparation process.
Cylinders prepared by the direct-transfer process are currently
used primarily for printing specialty packaging.
2-32
-------
c. Variable-area/Variable-depth Gravure
• ' Cylinders prepared by this process were once
used for most multi-color printing in the United States. The
method combines elements of the two previously described processes
for gravure cylinder preparation. A half-tone and a continuous-tone
image are both contact printed on to a sheet of sensitized carbon
tissue and gelatin. The carbon paper/gelatin sheet is transferred
to the copper cylinder. The cylinder is etched producing a pattern
of discontinuous ink cells of varying size and depth which
correspond to the areas of light and shadow on the continuous and
half-tone composite image. Cylinders prepared by this process are
typically used in very long press runs because of their good wear
characteristics. In the U.S., the variable-area/variable depth
process for gravure cylinder preparation has been replaced by the
electromechanical, process.
. d. Laser Imaging .
A proprietary system developed in Japan uses
laser technology to image a cylinder treated with a photopolymer
resist. However, once the resist has been exposed,•traditional
chemical etching techniques are used to prepare the cylinder. This
process finds limited use in the preparation of cylinders for
packaging and product gravure printing (GAA 1991).
e. Electromechanical Engraving
The electromechanical cylinder engraving
process, introduced in the late 1960s, has largely replaced the
chemical etching process for the preparation of gravure cylinders.
.Electromechanical engraving is performed using a computer-
controlled lathe-type cutting machine. The lathe uses a diamond
tool to engrave a pattern of variable size and depth cells on the
copper cylinder.. Engraving speeds range from 2,000 to 5,000 cells
per second with a speed of 3,200 cells per second being typical.
At 3,200 cells per second, a typical 30 inch by 40 inch cylinder
would require two hours and 20 minutes to engrave.
An electronic signal that is'varied to represent values from
zero to 100 percent controls the cutting of corresponding size
cells on the cylinder. Typically, the electronic signal originates
from a drum scanner (or one of the more recent and faster, scanning
technologies such as the high-speed drum scanner or the flat-bed
scanner). The image to be engraved is mounted on the drum of the
scanner and as the drum spins, the image is scanned by a
combination microscope and electronic eye mounted on the scan
carriage. •
2-33
-------
With early electromechanical engravers, what was seen by the
electronic eye of the scanner was immediately engraved on the
gravure printing cylinder. Today, however, entire images are
scanned into computer memory to be used whenever needed. The
computer storage of scans has a number of advantages: cylinder
quality can be improved because stored images can1 be previewed for
errors; images can be electronically manipulated; images can be
engraved as often as desired without loss of quality; and entire
cylinders can be engraved in one nonstop pass of the engraving head
(GAA 1991).
Recently direct digital engraving has become widespread. With
this process the image can be created and manipulated using an
image handling computer. Therefore, the steps of creating,
copying, and rescanning film, and the loss of quality inherent in
these steps, can be avoided (GAA 1991).
2. Gravure Cylinder Plating
Today virtually all finished gravure cylinders have
a copper surface coated with a thin layer of chromium. The copper
carries the, engraved image while the chrome provides a protective
layer against the friction of the doctor blade and the printing
substrate (GAA 1991).
Both the copper and chrome layers are applied using an
electroplating process. •Copper plating is used for plating base
copper onto repaired cylinders and for replating the image carrier
layer onto the base copper layer of previously used cylinders. The
electrolyte used in the acid plating process consists of copper
sulfate, sulfuric acid, deionized water, and small quantities of
organic additi.ves. Use of a cyanide based electrolyte for copper
plating is restricted to the original manufacture of cylinders (GAA
1991).
Chrome plating is applied in a very thin layer so as to change
the shape of the cells engraved in the copper as little as
possible. For most applications the chrome is plated in layers of
about six microns (0.00023 inches), though thicker layers are
applied to protect cylinders from the abrasive inks used in some
product gravure printing (GAA 1991). The primary electrolyte used
in chrome plating consists of chromic acid, , sulfuric acid,
deionized water, and small amounts of organic, additives (GAA 1991) .
3. Gravure Presses and Printing
The gravure process has its origins in the early
seventeenth century when the intaglio printing process was
developed to replace woodcuts in illustrating the best books of the
2-34
-------
time. In early intaglio printing, illustrations were etched on
metal, inked, and pressed on paper. •
Gravure, still also known as intaglio printing, makes use of
the ability of ink to adhere to a slight scratch or depression on
a polished metal plate. Today almost all gravure printing is done
using engraved copper cylinders protected from wear by the
application of a thin electroplate of chromium. During printing,
the surface of the engraved cylinder is flooded with ink with the
excess removed by a mechanical wiper known as a doctor blade.
Paper or another substrate is brought into contact with the
cylinder with sufficient pressure that it picks up the ink left in
the depressions. Characteristic of this method of printing is a
sharp, fine image.
Web-fed gravure presses account for almost all publication,
packaging, and product .gravure printing. These presses are•
generally custom manufactured machines designed for a specific
range of products. The typical press is highly automated and
consists of multiple print units. The printing mechanism in a
rotogravure press consists of a gravure cylinder and a smaller,
rubber clad impression cylinder. A typical modern rotogravure
press is shown in schematic form in Figure 16. Rotogravure presses
do not use elaborate .trains of inking rollers like those in certain
types of presses. Instead, low-viscosity inks are flooded onto the^
printing cylinder from an ink fountain. Excess ink is wiped from
the cylinder by a doctor blade. During printing the paper passes
between the impression roller .and the gravure cylinder. The rubber
covered impression roller applies pressure to the paper and the ink
in the cells on the cylinder is transferred to the paper.
Other types of gravure presses in commercial use today are
sheet-fed, intaglio plate,, and offset gravure. These types of
presses are used primarily for -special printing applications.
Sheet-fed gravure is used when very high quality impressions
are required. Uses include the production of pictorial impressions
for art books/and posters and short runs of high quality packaging
material such as cosmetics cartons. Sheet-fed gravure presses are
also used for overall coating of products printed by sheet-fed
offset to provide high brilliancy to the printed sheet and for the
application of metallic inks that cannot be applied by the offset
method. Additionally, sheet-fed gravure presses are used to
produce proof copies prior to large rotogravure runs (GAA 1991).
The sheet-fed gravure press differs from the web-fed press
primarily in that paper is delivered to the press as pre-cut sheets
instead of a continuous web. The printing mechanism in a typical
sheet-fed gravure press consists of a gravure cylinder and an
impression cylinder of the same size. The plate itself is a
flexible metal sheet wrapped around a carrier cylinder equipped
2-35
-------
single-color station
dryer
impression roller
doctor
blade
LJ
printing
cylinder
ink fountain
additional stations for
multicolor printing
sheets
folder
rewind
Figure 16. Rotogravure Press (Source: Field 1980. Reproduced
by permission of Ayer Company Publishers, Inc.)
2-36
-------
with a gripper to hold the plate in place during printing. The gap
in the cylinder is fitted with a protective cover once the plate
has been mounted. This cover prevents ink from collecting in the
gap and consequently producing an unwanted image on the substrate.
Ink is flooded onto the plate from a fountain roller. In
multicolor printing, air may be directed at the plate to slightly
dry the ink and thus assure proper trapping of the ink in the
cells. A limited number of sheet-fed gravure presses use a flat
plate instead of a cylinder as the image carrier (GAA 1991).
Intaglio plate printing is used to produce stamps, currency,
bank notes, securities, and stationary items such as invitations
and business cards 1 It is also used for fine arts printing. Most
intaglio plate presses use gravure printing cylinders. However, a
flat gravure plate is used for fine arts printing. Intaglio plate
printing presses differ from other gravure presses primarily in the
inking system which is designed to handle thick paste-like ink (GAA
1991). / . •
The offset gravure press is a standard gravure unit to which
a rubber-covered transfer roller has been added. The image to be
printed is transferred from the gravure printing cylinder to the
roller. The transfer roller then prints the image on .the
substrate. The transfer of the image from the cylinder to the
roller is similar to the transfer method used in .offset
lithography. Offset gravure presses are used to print substrates
with irregular surfaces such as wood veneer or decorated metal (GAA
1991). • -
Another type of offset gravure press, the flexo gravure press,
is currently used for printing clear film overwraps for paper
towels and tissues as well as high quality plastic shopping bags.
A flexo gravure- press is a flexographic press on which the anilox
roller has been replaced by a gravure printing cylinder (GAA 1991) *•
In order to fill the tiriy cells on the printing cylinder or
plate, very low viscosity inks must be used^in gravure printing.
The inks are maintained in a low viscosity state by the use of
solvents. The solvents must be evaporated quickly so that the ink
will dry before the paper reaches the next printing station on the
press. This is necessary because wet inks cannot be overprinted
without smearing and smudging. Therefore, high volume air dryers
are placed after each printing station. The solvent-laden air from
the dryers is passed through either a solvent recovery system or
solvent vapor incinerator. A typical recovery system uses beds of
activated carbon to absorb the solvent. Saturated beds are
regenerated by steam. The solvent laden steam is then condensed
and the water and solvent separate by gravity. Greater than 95
percent of the ink solvents are recovered using this process
(Buonicore). The .solvents can either be reused or destroyed by
incineration. .
2-37
-------
.,,(' •'
-------
a competitive edge in the printing of mass-circulation magazines
because the process offers high speed, high quality four color
illustrations on less expensive paper, variable cut-off lengths,
and flexible folding equipment. These presses can have as many as
ten printing stations - four for color and one for monochrome text
and illustration in each direction so that both sides of the web
can be printed in one non-stop operation. They can handle web
widths of up to 125 inches and are equipped to print most large
format publications in circulation today. Publication 'gravure
presses can also be fitted with cylinders of differing diameters to
accommodate varying page sizes. ,
The major types of chemicals used in publication gravure
include adhesives, metal plating solutions, inks, and cleaning
solvents. In terms of chemicals, publication gravure differs from
packaging and product gravure primarily in its heavy reliance on
toluene-based ink (GATF 1992b). The publication gravure industry
has had little success with water-based inks (Buonicore).• The
industry has found that in publication gravure where the substrate
is always paper stock, water-based inks have not been capable of
printing commercially acceptable quality productions runs of 2,000
to 3,000 feet per minute. A process flow diagram as well as
information on the chemicals used in this process arey presented in
Figure 17.
b.
Packaging Gravure
Packaging rotogravure presses are used for
printing folding cartons as well as a variety of other flexible
packaging materials. In addition to printing, packaging gravure
presses are equipped to fold, cut, and crease paper boxes in a
continuous process. Packages are usually printed on only one side,
so the number of print stations is usually about half 'that required
for publication gravure presses. However, in addition to printing
stations for the four basic colors, packaging gravure presses may
employ printing stations for the application of metallic inks and
varnishes as well as laminating stations designed to apply,foils to
the paper substrate prior to printing.
Packaging gravure presses are designed with the accurate
cutting and creasing needs of the packaging material in mind.
However, image quality is generally less important in packaging
printing than in most other types of printing and, subsequently,
receives less emphasis.
The chemicals used in packaging gravure are similar to those
used in publication gravure. However," the inks used in packaging
gravure are largely alcohol- and not toluene-based (GATF 1992b),.
Water-based inks are being successfully used for lower quality,
non-process printing on paper and paperboard packaging and for
2-39
-------
PUBLICATION GRAVURE
PROCESS FLOW DIAGRAM
l.
2.
4.
5.
6.
7.
8.
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
CYLINDER MAKING
CYLINDER PROOFING
PRESS .MAKEREADY
PRINTING, COATING
SLITTING, PERFORATING,
CUTTING, FOLDING
LABELING
INSERTING, COLLATING,
STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
n
PRESS
POSTPRESS
Figure 17. Publication Gravure (Source:
2-40
-------
PUBLICATION GRAVURE (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step m me process flow diagram:
1. Adhesive, glass cleaner
2. Photographic processing solution, cleaning solvent
3 Chromium plating solution, polishing compound, etching solution, copper plating
solution, nickel plating solution, sulfuric acid solution, degreasing salt, dechroming
solution .
4. Cylinder cleaner, gravure ink, cylinder cleaning solvent, roller cleaner, toluene,
alkane hydrocarbons
5/6. Gravure ink, imprinting inks, ink remover, splicing cement, ink jet inks
7. None
8. Adhesive, cleaning solvent, adhesive remover
9. Adhesive, adhesive remover
Figure 17. Publication Gravure (continued) (Source: GATF 1992b).
2-41
-------
PUBLICATION GRAVURE (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Cylinder making
Press
Ink, varnish
Wash solvent
Postpress
Glue, adhesive
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid,
aluminum sulfate
Barium chloride, 1,1,1-trichloroethane, aliphatic petroleum
distillates, ammonium oxalate, ammonium molybdate, barium
formate, calcium benzoate, chromic acid, citric acid, copper ~
sulfate, dicarboxylic acid, cupric tetrafluoborate, ethyl
acetate, ethylenediamine, formaldehyde, copper, hydrogen
peroxide, hydrochloric acid, muriatic acid, isopropanol,
phosphoric acid, sodium hydroxide, sulfuric acid, zinc
chloride
Hexane, mineral spirits, heptane, lactol spirits, petroleum
naphtha, VM&P naphtha, toluene, xylene, alcohols
Toluene, aliphatic and other aromatic hydrocarbons, ethanol,
mineral spirits, acetone, isopropanol
Paraffin wax, toluene, 1,1,1-trichloroethane, isopropanol
Figure 17. Publication Gravure (continued) (Source: Mathtech)
10! ' •'!•',: "
2-42
-------
printing on non-absorbent packaging substrates such as plastics,
aluminum, and laminates (Tyszka 1993). Use of water-based inks is
axpected to increase; however, problems still limit their use at press
speeds above 1,000 feet per minute (Budnicore). A process flow
iiagram as well as information on the chemicals used in- this process
ire presented in Figure 18.
c.
Product Grcivure
The continuous printing surface found on gravure
press cylinders provides the "repeat" required to'print the continuous'
patterns found on textiles, and a variety of other products. In the
:extile industry, a gravure heat transfer process using subliming dyes
Ls used to print images, on paper. These images are then transferred
Erom the paper to a fabric (usually polyester) through a combination
heat and pressure. The gravure process is also used to print
continuous patterns on wallboard, wallpaper, floor coverings, and % •
plastics.
The chemicals used in product gravure are similar to those used
In both publication and packaging gravure. However, product gravure
ises both water- and solvent-based inks (GATF 1992b). The industry
las used water-based inks successfully on medium-weight papers and on
lonabsorbent substrates such as plastics, aluminum, and laminates
(Tyszka 1993). However, problems such as paper distortion and curl
persist with lightweight papers (Buonicore). A process flow diagram
as well as information on 'the chemicals used in this process are
presented in Figure 19.
4. Volume of Output and Percentage of Total Market
In 1991 gravure printing accounted for 19 percent of
;he total value of U.S. printing industry output (excluding instant
and in-plant printing). Between 1991 and 2025, gravure's market share
Ls expected to decline to 16 percent of the total U.S. market.
Sravure will continue to be the dominant process for the printing of
Long-run products such as mass-circulation magazines and catalogs, and
certain types of packaging. However, the long-run products market is
relatively mature and little growth is expected (Bruno 1990, 1991).
5. Number and Relative'Size of Printing Companies
Based on a member survey, the Gravure Association of
America reports that there were 1,090 plants with gravure presses in
1989 (GAA 1989). Gravure printing is generally used by medium to
large size printers (Lewis 1992).
2-43
-------
1.
2.
3.
4.
5.
6.
7.
8.
PACKAGING GRAVURE
PROCESS FLOW DIAGRAM
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
CYLINDER MAKING
•
CYLINDER PROOFING -'-"-Z.
PRESS MAKEREADY
PRINTING, COATING
.
LAMINATING, DIECUTTING
INSERTING, COLLATING,
FOLDING, STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
. PRESS
POSTPRESS
_l
Figure 18. Packaging Gravure (Source: GATF 1992b).
2-44
-------
PACKAGING GRAVURE (eont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive, glass cleaner
Photographic processing solution; cleaning solvent
2.
3.
Chromium plating solution, polishing compound, etching solution, copper plating
solution, nickel plating solution, sulfuric acid solution, degreasing salt, dechroming
solution
4. Cylinder cleaner, gravure ink, cylinder cleaning solvent, roller cleaner
5/6. Gravure ink, imprinting inks, ink remover, splicing cement, isopropyl alcohol, ink
jet inks
7. Adhesive, cleaning solvent, adhesive remover
8. Adhesive, adhesive remover
Figure 18. Packaging Gravure (continued) (Source: GATF 1992b).
. 2-45
-------
PACKAGING GRAVURE (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Cylinder making
Press
Ink, varnish
Wash solvent
Postpress
Glue, adhesive
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Barium chloride, 1,1,1-trichloroethane, aliphatic petroleum
distillates, ammonium oxalate, ammonium molybdate, barium
formate, calcium benzoate, chromic acid, citric acid, copper
sulfate, dicarboxylic acid, cupric tetrafluoborate, ethyl acetate,
ethylenediamine, formaldehyde, copper, hydrogen peroxide,
hydrochloric acid, muriatic acid, isopropanol, phosphoric
acid, sodium hydroxide, sulfuric acid, zinc chloride
Toluene, xylene, mineral spirits, acetone, methyl ethyl
ketone, methyl isobutyl ketbne, ethyl acetate, isopropyl
acetate, n-propyl acetate, butyl acetate, n-butyl acetate,
ethylene glycol monoethyl ether, methanol, ethanol,
isopropanol, tri-decanol
Ah'phatic and aromatic hydrocarbons, ethanol, mineral spirits,
acetone, toluene, isopropanol
Paraffin wax, toluene, 1,1,1-trichloroethane, isopropanol
Figure 18. Packaging Gravure (continued) (Source: Mathtech) .,
2-46
-------
1.
2.
3.
4.
5.
6.
7.
8.
PRODUCT GRAVURE
PROCESS FLOW DIAGRAM
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
CYLINDER MAKING
CYLINDER PROOFING
PRESS MAKEREADY
PRINTING
SLITTING, PERFORATING,
CUTTING, FOLDING
LAMINATING, GLUEING
PRODUCT
PREPRESS
PRESS
~T
POSTPRESS
Figure 19. Product Gravure (Source: GATF 1992b)
2-47 .
-------
PRODUCT GRAVURE (cont'd)
CHEMICAI/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive, glass cleaner
2. Photographic processing solution, cleaning solvent
3. Chromium plating solution, polishing compound, etching solution, copper plating
solution, nickel plating solution, sulfuric acid solution, degreasing salt, dechroming
solution
4. Plate cleaner, gravure ink, cylinder cleaning solvent, roller cleaner
5/6. Gravure ink, imprinting inks, ink remover, splicing cement, isopropyl alcohol, ink
jet inks
7. None
8. Adhesive, cleaning solvent, adhesive remover
Figure 19. Product Gravure (continued) (Source: GATF i992b).
'2-48
::::i:'; • •* «•. ;s; m. ?; I;; • <. •';;:,,, i; ;i;'.'; •• A, iW/'j
1' :,-:," i".;.,;, ::.,,|,: i',;,..; it.., •;;, iv: .s-SiSSi • .iiiit.;;tiJl*^^^^^^^^^^^^^^^^^^^^ ssn {^MifciM sniii :,''.' Hi flu,;- :.ii:«Jii»^^^^^^^^^^^ I
-------
Operation/Process
Prepress ,
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Cylinder making
PRODUCT GRAVURE (cont'd)
MAJOR CHEMICALS USED
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Press
Ink, varnish
Wash solvent
Postpress
Glue, adhesive
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosaUcyclic acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Barium chloride, 1,1,1-trichloroethane, aliphatic petroleum
distillates, ammonium oxalate, ammonium molybdate, barium
formate, calcium benzoate, chromic acid, citric acid, copper
sulfate, dicarboxylic acid, cupric tetrafmoborate, ethyl acetate,
ethylenediamine, formaldehyde, copper, hydrogen peroxide,
hydrochloric acid, muriatic acid, isopropanol, phosphoric
acid, sodium hydroxide, sulfuric acid, zinc chloride
Toluene, xylene, mineral spirits, acetone, methyl ethyl
ketone, methyl isobutyl ketone, ethyl acetate, isopropyl
acetate, n-butyl acetate, ethylene glycol monoethyl ether,
methanol, ethanol, isopropanol, tri-decanol
Aliphatic and aromatic hydrocarbons, ethanol,mineral spirits,
acetone, toluene, isopropanol
Paraffin wax, toluene, 1,1,1-trichloroethane, isopropanol
Figure 19. Product Gravure (continued) (Source: Mathtech)
2-49
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C. Flexocrraphy
1- Flexographic Platemaking
Flexographic plates are relief plates made of either
rubber or ultraviolet light sensitive polymers (i.e.,
photopolymers) . The first step in making a rubber flexpgraphic
plate is the production of an engraving of the job using a
photomechanical process. Once finished, the engraving is placed in
a mold press. The mold is produced by pressing the mold material,
which can be either plastic or glass, against theengraving under
controlled temperature and pressure. The resulting mold is then
used to make a rubber flexographic plate; a rubber sheet is pressed
into the mold under pressure and elevated temperature.
The production of photopolymer flexographic plates is a
direct-to-plate process that does not require an original plate or
mold. The process differs depending on whether solid sheets of
photopolymer or liquid photopolymer are used, though the two
processes are similar in general outline. Inboth processes the
plates are made in ultraviolet exposure units. A negative of the
job is placed between the photopolymer and the ultraviolet light
source. The photopolymer sheet or liquid is then exposed to
ultraviolet light, hardening the image area. Lastly, the plate is
processed to remove the unhardened non-image area. Photopolymer
plates are replacing rubber plates because they offer superior-
quality and performance at a lower cost.
2.
Flexographic Presses and Printing
Flexographic presses combine features of both
letterpress and .rotogravure printing. Like letterpress, the
process uses relief plates and, like rotogravure,, it uses low-
viscosity, fast-drying inks. Typically, the plates are made of
low-cost rubber or photopolymer. .Inexpensive, durable plates
coupled with simple printing techniques and the use of a two roller
system to distribute ink onto the plate cylinder allow for easy
makeup and cleanup. As a result, flexography is one of the least
expensive printing processes. Flexographic presses are capable of
producing good quality impressions on many different substrates.
Figure 20 presents schematics of a web-fed rotary press and a three
roller ink system typical of those used in flexographic printing.
The five types of printing presses used for flexographic
printing are the stack type, central impression cylinder (CIC), in-
line, newspaper unit, and dedicated 4-, 5-, or 6-color unit
commercial publication flexographic presses. All five types employ
a plate cylinder, a metering cylinder known as the anilox
2-50
-------
JflU/v
y BY
y . \y •
JL
J L
Infeed & Tension Control
Printing & Drying
Outfeed & Rewind
Anilox Roll
Fountain Roll
Plate Cylinder
Plate
Impression
Cylinder
Substrate
Figure 20. Web-fed Rotary Flexo.graphic Press (top) and
Three Roller Ink System (Source: Adams 1988. Reproduced by
permission. Printing Technolocrv, 3rd Edition by J. Michael
Adams, David D. Faux and Lloyd Reiber, Delmar Publishers,
Inc., Albany, New York, Copyright 1988)
2-51
-------
roll that applies ink to the plate, and an ink pan.
use a third _ roller as a. . fountain', ' roller/ and ^'^in^
doctor blade for improved ink distribution.
Some presses
The stack press is characterized. by one or more stacks of
printing stations arranged vertically on either side of the press
frame. Each stack has its own plate cylinder which prints one
color of a multicolor impression. All stations are driven from a
common gear train. Stack presses are easy to set up arid can print
both sides of the web in one pass. They can be integrated with
winders, unwinders, cutters, creasers, and coating equipment. They
are very popular for milk carton printing. A drawback of stack
presses is their poor registration; the image position on every
printed sheet is not as consistent as in many other printing
processes.
Central impression cylinder (CIC) presses use a single.
impression cylinder mounted in the press frame. Two to eight color
printing stations surround the central impression cylinder. Each
station consists of an ink pan, fountain roller, anilox roll,
tloctor blade, and plate cylinder. As the web enters the press it
comes jlnto contact with the impression cylinder and remains in
contact until it leaves the press. The. result is precise
registration which allows CIC presses to produce very good color
impressions.
* • •
The in-line flexographic press is similar to the stacked press
except the printing stations are arranged in a horizontal line.
They are all driven by a common line shaft and .may be coupled to
folders, cutters, and other postpress equipment. These presses are
used for printing bags, corrugated board, folding boxes, and
similar products.
A newspaper flexographic' press consists of multiple printing
units, each unit consisting of two printing stations arranged back-
to-back in a common frame. The use of paired stations allows both
sides of the web to be printed in one pass. Multiple printing'
stations are required to print the 'many pages that make, up a
typical newspaper. Single and double .color decks, stacked units,
or 4-, 5-, or 6-color units are sometimes positioned above those
units where the publisher wants to provide single or multiple spot
color, spot color for both sides of the web, or process color,
respectively (Buonicore).
Commercial publication flexographic presses are compact high-
speed presses with wide web capability that utilize dedicated 4-,,
5-, or 6-color units. Typically, two four-color units are paired
in one press to allow printing on both sides of the web.
Publication flexographic presses generally incorporate infrared
dryers to ensure drying of the waterborne ink after each side of
the web is printed (Buonicore).
2-52
-------
There are two primary reasons why flexography is gradually
becoming a major player in the printing industry: 1) it is a
relatively simple operation; and 2) it is easily adapted to the use
of water-based inks. The widespread use of water-based inks _ in
flexographic .printing means a large reduction in VOC emission
compared to the heatset web or gravure printing processes.
Publication flexography is used mainly in the production of
-newspaper, comics, directories, newspaper inserts, and catalogs.
Packaging flexography is used for the production of folding
cartons, labels, and packaging materials. Large quantities of inks
are used during normal runs on flexographic presses; however, some
printers are able to recycle a majority of their spent inks and
wash waters.
Major chemicals used in flexography include platemaking
solution, water and solvent based inks, and blanket/roller cleaning
solvents. Figure 21 presents a process flow diagram as well as
information on the chemicals used in publication flexography.
Figure 22 presents this information for packaging flexography (GATF
1992b) .
3. Volume of Output -and Percentage of Total Market
In 1991, flexqgraphic printing accounted for ill
percent of the total value of U.S. printing industry output
(excluding instant and in-plant printing). Between 1991 and 2025,-
however, flexography's share of the market is expected to increase
to 21 percent.- Growth areas for flexography .which recently
replaced letterpress as the major relief printing process, are
expected to be preprinted labels for corrugated boxes, pressure
sensitive labels, newspaper inserts, comic books, and directories
and catalogs (Bruno 1990, 1991).
4. ' Number and Relative Size of Printing Companies
Of a total of 59,636 plants with printing presses,
only 1,587, or 2.7 percent, have flexographic presses.
Flexographic printers, however, tend to be larger than printers
using other processes. Almost 55 percent of plants 'with
flexographic presses have 20 or more employees compared to less
than 16 percent in the printing industry as a whole (A.F. Lewis
1991).
D. Letterpress '
1. Letterpress Platemaking
Letterpress and flexographic plates are made using
the same basic technology. The two basic types of plates used in
letterpress printing are original plates and duplicate plates.
Only duplicate plates are used in flexography.
2-53
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2.
4.
5.
6.
7.
8
PUBLICATION FLEXOGRAPHY
PROCESS FLOW DIAGRAM
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
FILM PROCESSING AND ASSEMBLY
•
PLATEMAKING
PRESS MAKEREADY
PRINTING, COATING
LABELING
INSERTING, COLLATING,
FOLDING, STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
"1
PRESS
POSTPRESS
_J
Figure 21. Publication Flexography (Source: GATF 1992b)
'' • ' : , '"2-54
-------
PUBLICATION FLEXOGRAPEY (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Glue, cleaning solvent, class cleaner
2. Glue
3. Film fixer, film developer, film cleaner, antistatic spray
4. Platemaking photopolymer, plate washing, defoamer, plate etching compound,
plate cleaning liquid, isopropyl alcohol
5. Microbial agent
6. Flexo ink (solvent- or water-based), varnish blanket and rolle.r wash, ink
cleaner/remover, plate preserver
7. Adhesive
8. Adhesive . ,
Figure 21. Publication Flexography (continued)
2-55
-------
PUBLICATION FLEXOGRAPHY (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Flexoplatemaking
solution
Press
Ink
Wash solvent/plate
cleaner
Wash solution
Postpress
Glue, adhesive
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquhione, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Methacrylate monomer, organic
phosphorous compounds, petroleum distillates, anionic
surfactants, potassium hydroxide
Benzisothiazolinon, ethylenediamine, ammonium hydroxide,
antimicrobial agents, isopropanol, toluene
Aliphatic and aromatic hydrocarbons, ethanol, mineral
spirits, acetone, toluene
Ethylene glycol monoethyl ether, amines, ammonia
Paraffin wax
Figure 21. Publication Flexography (continued)
,1V.'••;1,I'll1! 'l* ':•
2-56
-------
1.
2.
3.
4.
5.
6.
7.
8.
PACKAGING FLEXQGRAPHY
PROCESS FLOW DIAGRAM
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
FILM PROCESSING AND ASSEMBLY
PLATEMAKING
PRESS MAKEREADY
PRINTING, COATING
LAMINATING, DIECUTTING
INSERTING, COLLATING,
FOLDING, STITCHING, GLUEING,
TRIMMING, BINDING
PRODUCT
PREPRESS
PRESS
POSTPRESS
_J
Figure 22. Packaging Flexography (Source: GATF 1992b)
2-57
-------
PACKAGING FLEXOGRAPHY (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive
2. Cleaning solvent, adhesive
3. Film fixer, film developer, film cleaning solvent
4. Platemaking fluid, spent platemaking fluid neutralization compound, muriatic
acid
5. Plate cleaning solvent, ink, plating cleaning solution
6. Plate cleaner, plate preserver, flexo ink, varnish, roller cleaning solvent
7. Adhesive, adhesive remover
8. Adhesive, adhesive remover
Specialty operations:
Lamination (glue)
Figure 22. Packaging Flexography (continued)
2-58
-------
PACKAGING FLEXOGRAPHY (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Flexoplatemaking
solution
Press
Ink
Wash solvent/plate
cleaner
Wash solution
Postpress
Glue, adhesive
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly')
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Methacirylate monomer, organic phosphorous compounds,
petroleum distillates, anionic surfactants, glycol' ethers,
sodium hydroxide
Benzisothiazolinon, ethylenediamine, ammonium hydroxide,
antimicrobial agents, isopropanol, toluene, n-propanol,
n-propyl acetate, ethyl alcohol, n-heptane
Aliphatic arid aromatic hydrocarbons, ethanol, mineral
spirits, acetone, toluene, isopropanol, methyl isobutyl ketone,
diethylene glycol ether, methyl ethyl ketone
Ethylene glycol monoethyl ether, amines, ammonia
Paraffin wax, toluene, 1,1,1-trichloroethane, isopropanol
Figure 22. Packaging Flexography (continued)
2-59
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Original plates are made by photomechanical means from artwork
or photographs that have been converted to either line or half-tone
negatives. The negatives are used to produce either a
photoengraved or photopolymer plate. When the original plates
themselves are used for printing, they are called direct plates.
Generally, direct plates are used for very short press runs.
Duplicate plates, cast in molds made from original plates, are used
for longer press runs.
i u inniii uiiLLii i u i 11,, LI i,
a. Original Plateg
Today, original plates are made either from a
variety of metals by acid etching methods or from photopolymer
plastics. Metal plates are commonly referred to as photoengravings
or engravings. The three types of engravings used, line, half-
tone, and combination, are dependent on the type of film negative
used to expose the plate prior to- engraving. Photoengravings are
made in units smaller than the size of the press cylinder allowing
several to'be mounted on the cylinder to produce a complete image.
Because rotary presses dominate the market, lett'erpress' printing
generally requires curved plates.
A second type of letterpress plate,thewraparound plate, is
made using the same general process as usec: £or photoengraving.
However, letterpress wraparound plates are mounted in one piece and
cover the entire surface of the cylinder.. Wraparound letterpress
plates are used for both dry offset and direct printing.
Photoengraved plates are produced on 16 gauge zinc, copper, or
magnesium. Copper is usually used for halftone plates and zinc and
other metals for line engravings. Photosensitive coatings used in
plate preparation are bichromated shellac for zinc and magnesium
plates and bichromated glue for copper plates. Photocrossiinking
polymers are also used for some plates. After exposure, the metal
plates are subjected to an acid bath wherethenon-printing areas
are etched away by the acid. Large non-printing areas may be
removed by mechanical routing. Nitric acid is frequently used to
etch zinc and magnesium plates' while a ferric chloride solution is
used for copper plates.
A major problem during etching is undercutting, the unwanted
sideways etching that can undercut the resist and adversely effect
dot size and line width on the plate. Today .a technique known as
powderless etching is used to prevent this problem. In powderless
etching, the etching bath consists of anemulsionof nitric acid,
oils, and a wetting agent. As the acid attacks the plate, the
wetting agent and oil form a banking agent that cTIhgs to the sides
of the etched areas and prevents sideways etching. This system has
been adopted for use on zinc, magnesium, • copper and aluminum
plates. Chemically, the emulsions used for etching copper and
aluminum plates are quite different from those used for zinc and
2-60
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magnesium plates. Powderless etching can be used for original "'
photoengraved plates as well as wraparound plates.
Photopolymer plates can be used for original and wraparound
applications or for making duplicate plates. The photopolymer
plates in use today are typically proprietary products and include
Dycril, Nyloprint, Letterflex,.- Dynaflex, NAPP, and Merigraph
plates.
Du Pont Dycril plates1, introduced in 1959, are used in a wide
variety of flat, rotary, and wraparound letterpress applications as
well as letterset applications. These plates also serve as
patterns for making duplicate plates. Dycril plates consist of a
layer of light-sensitive plastic bonded to a metal or film
substructure. When the plate is exposed to UV light through a
halftone or line type negative, the exposed areas of the plastic
coating is polymerized and becomes hardened. The unexposed coating
can be washed away using an alkaline spray.
Nyloprint plates, produced by BASF, Corp., are made of a
photosensitive nylon layer bonded to a backing material, usually
aluminum, steel, or distortion resistant foil. These plates are
used on cylinder presses for printing magazines and other long run
j obs. ' .•'.-•
Letter flex plates, manufactured by W. R. Grace & Co., are used
extensively in newspaper and book printing. They consist of a
liquid photosensitive prepolymer applied as a coating to a
polyester sheet. A machine performs both the coating and exposure
process in one operation. The liquid prepolymer is converted to a
solid polymer on exposed areas of the sheet. The liquid prepolymer
remaining on the unexposed areas is then removed. Used on cylinder
presses, Letterflex plates are very durable. :
Dynaflex plates, used primarily by the newspaper industry,
consist of a dry prepolymer photosensitive coating on a metal
substrate. Once exposed, processing is similar to other
photopolymer plates. The unexposed areas of the plate is easily
removed by water.
NAPP plates, developed in Japan but manufactured in the U.S.
by-Lee Enterprises, Inc., use a denatured polyvinyl alcohol coating
bonded to a steel or aluminum backing. The plates are delivered to
the printer in a presensitized state that are ready for exposure
without any other processing. After exposure, the plate is washed
in water to remove the unexposed material. These plates are used
primarily for letterpress applications but ' they can be easily
adapted to gravure and lithographic operations.
Merigraph plates, developed in Japan but manufactured in the
U.S. by Hercules, Inc., use a liquid unsaturated polyester
2-61
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photopolymer similar to that found on the" Letterflex plate.
machine is used to coat the plate just prior to exposure.
b. Duplicate Plates
A duplicate is a plate cast in a mold made from
an original plate. Duplicate plates are used because they can be
made from a number of durable materials resulting in plates with
longer service lives than is possible with original_ plates.
Furthermore, if a duplicate plate is damaged, a new duplicate can
quickly be produced from the original. Curved duplicate plates are
produced to fit modern press cylinders.
Duplicate plates fall into four general categories:
stereotype, electrotype, plastic, and rubber. Each of these types
of plates are described in greater detail below.
Stereotype plates are used only for letterpress newspaper
printing. A stereotype plate is prepared by first making a_paper-
mache mat or mold from the original plate. Molten metal is then
poured into 'the paper-mache mold to form the press plate. The
metal used depends on the length of the press run. For long runs
nickel, chromium, or iron are used.
Electrotype plates are used in letterpress operations where
high quality is required. This includes commercial printing,,
books, and magazines. An impression or mold,of the original is
made using hot plastic. The mold is then plated with silver to
make it conductive. The coated mold is then electroplated with a
thin layer of copper or nickel. The resulting shell is removed
from the- mold and backed with molten metal to give it strength.
The face can then be plated with nickel, iron, or chromium for long
press runs.
Plastic and rubber plates are prepared in a process similar to
the one used to make electrotype plates. The use of plastic or
rubber makes the plates very lightweight and low-cost. Plastic
plates are made from thermoplastic vinyl resins. Currently,
however, use of this type of plate is not widespread due largely to
the toxicity of the vinyl monomers used.
Rubber plates can be molded from either natural or synthetic
rubber or some combination of the two. These plates are used on
flexographic presses for printing wrapping paper, bags, envelopes,
corrugated boxes, milk cartons, and any application where the
flexible characteristics of rubber assist printing on irregular and
rough surfaces. These plates are also used for special "central
impression presses" used to print flexible films used in packaging.
2-62
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2. Letterpress Presses and Printing
Letterpress printing dates back to the earliest
methods, for applying an image to paper. The three types of
letterpress presses in use today are platen, flat-bed, and rotary
presses. Schematic representations of two of the most common types
of letterpress presses, the unit-design perfecting rotary press and
the rotary letterpress typically used for magazine printing, are
shown in Figure 23.
Platen presses have been in continuous use since Gutenberg
first invented the printing press. A platen press is made up of
two flat surfaces called the bed and the platen. The plate
containing the image is placed on the bed and locked down. The
platen provides a smooth backing for the paper or other substrate
that is to be printed. The'plate is inked and then the platen
presses the substrate against the plate producing the impression.
Some platen presses are arranged with the bed and platen in the
verticalpplane. .
The plate is inked with an inking.roller that transfers ink
from an inking plate to the image carrier. Ink is placed on the
inking plate by an ink fountain roller. The platen style press has
been widely used in printing small-town newspapers since the late
1800s. The printing area is usually limited to a maximum of 18
inches by 24 inches. These presses are also used to print
letterhead, billheads, form's, posters, announcements, and many
other types of printed products, as well as for imprinting,
embossing, and hot-leaf stamping.
Flat-bed cylinder presses use either vertical or horizontal
beds. These presses can print either one or two-color ^impressions.
Flat-bed cylinder presses, which operate in a manner similar to the
platen press, will print stock as large as 42 inches by 56 inches.
The .plate is locked to a bed which passes over an inking roller and
then against the substrate. The substrate passes around an
impressipn cylinder on its way from the feed stack to the delivery
stack. Ink is supplied to the plate cylinder by an inking roller
and an ink fountain. Flat-bed cylinder presses are slow, having a
production rate of not more than 5,000 impressions per hour. As_a
result, much of the printing formerly done on this type of press is
now done using rotary letterpress or lithography. The horizontal
bed press, the slower of the two types of flat-bed cylinder press,
is no longer manufactured in the United States.
Rotary presses are currently the most popular type of press
used in letterpress operation. They can be either sheet-fed or
web-fed and, in construction, are similar to other sheet-fed and
web-fed presses. Like all rotary presses, rotary letterpress
requires curved image carrying plates. The most popular types of
plates used are stereotype, electrotype, and molded plastic or
2-63
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plate
cylinder
inking roller
impression
cylinder
folder
plate
^cylinder
inking
"roller
ink fountain
paper roll
plate cylinder
inking
roller
ink
fountain
impression
cylinder
paper roll
folder
Figure 23. Unit-design Perfecting Rotary Press (top) and
Rotary Letterpress.Typically Used for Magazine Printing
(Source: field 1980. Reproduced by permission of Ayer
Company Publishers, Inc.')
2-64
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rubber. When printing on coated papers, rotary presses use heat-
set inks and are equipped with dryers, usually'the high-velocity
hot air type. .
i . •
Web-fed rotary letterpress presses, are used primarily for
printing newspapers. These presses are designed to print both
sides of the web simultaneously. Typically, they can print up to
four pages across the web; however, some of the new presses can
print up to six pages across.a 90-inch web. Rotary letterpress is
also used for long-run commercial, packaging, book, and magazine
printing. -
Major chemicals used in letterpress printing, very similar to
those used in lithography, include film developers and fixers,
inks, and blanket and roller washes (GATF 1992b). A process flow
diagram as well as information on the chemicals used in this
process are presented in Figure 24.
3. Volume of Output and Percentage of Total Market
Prior to the Second World War letterpress was the
dominant printing process, but since the mid-1940s it has been
gradually replaced by other printing processes. In 1991,
letterpress printing accounted for 11 percent of the total value of
U.S. printing industry output (excluding instant and in-plant
printing). However, between 1991 and 2025, letterpress' market
share is expected to decline dramatically to only four percent of
.the total U.S. market. By 2025, letterpress will no longer rank as
a major printing process. Gra.vure has largely replaced letterpress
in the printing of long-run magazines and catalogs while
flexography is replacing it for printing paperbacks, labels,
business forms,'newspapers., and directories (Bruno 1990, 1991).
4., Number and Relative Size of Printing Companies
In 1982, the. latest year for which data are
available, 20,786 plants used letterpress presses. More recent
data, was available on the number of plants with sheet fed
letterpress presses; in 1988, there were 18,961 plants with this
type of press. In 1982, over 83 percent of plants with letterpress
presses had fewer than 20 employees and almost 46 percent had fewer
than five. In 1988, almost 85 percent of plants with sheetfed
letterpress presses had fewer than 20 employees and 44 percent had
fewer than five (A.F. Lewis 1991).
2-65
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1.
2.
4.
5.
7.
LETTERPRESS
PROCESS FLOW DIAGRAM
ART DESIGN, ORIGINAL PICTURE/FILM
-
PHOTOGRAPHY, COLOR SCANNING,
SEPARATION , PROOFING , STRIPPING ,
TYPESETTING, PHOTOTYPE SETT ING
.
FILM PROCESSING AND ASSEMBLY
PLATEMAKING
. • , PRESS MAKEREADY
PRINTING
DIECUTTING, INSERTING, COLLATING,
FOLDING, STITCHING, GLUEING,
LAMINATING, TRIMMING, BINDING
PRODUCT
PREPRESS
~l
PRESS
POSTPRESS
Figure-24. Letterpress (Source: GATF 1992b)
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LETTERPRESS (coht'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive, cleaning solvent
2. Color scanner cleaner, deletion fluid
3. Film developer and fixer, film cleaner, film system cleaner, image
cleaner/preserver, antistatic spray, adhesive
4. Plate developer and finisher, plate toner, plate system cleaner
5. Letterpress ink, blanket wash,, roller wash, copperizing solution, anti-setoff
powder
6. Adhesive, ink
7. Adhesive
Specialty operations:
Lamination (glue, varnish, plastics)
Cellophane window (glue)
Figure 24. Letterpress (continued).
: 2-67
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LETTERPRESS OPERATION (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film/glass cleaner
Equipment cleaner
Film developer
Film fixer
Plate developer
Plate
ress
Ink, varnish
Ink thinner
Wash solvent
Linotype
Postpress
Glue
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Acetone, hexane, 1,1,1-trichloroethane, ethanol, n-propanol,
perchloroethylene, 2-butoxy ethanol, isopropanol
Isopropanol, hexane, acetone
Sodium sulfite, sulfosalicyclic acid, hydroquinone, potassium
sulfite, potassium hydroxide, butyl-diethanolamine
Ammonium thiosulfate, sodium acetate, acetic acid, aluminum
sulfate
Surfactant, Benzyl alcohol, diethanolamine, polyvinyl alcohol,
ethylene glycol, thiol compounds, acetic acid
Photosensitive polymers
Petroleum distillates, vegetable oil, resin, rosin, toluene,
isopropanol, xylene,
pigments containing barium and copper
Hydrotreated or solvent extracted naphthenic distillates
Aliphatic and aromatic hydrocarbons, ethanol, turpentine,
acetone
Lead, zinc, tin
Paraffin wax, methanol, hexane, acetone, ethylene dichloride,
methyl ethyl ketone, polyglycol dimethacrylates, methyl
cyanoacrylates, toluene
Figure 24. Letterpress (continued).
2-68
.
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E. Screen Printing . .
1. Screen Preparation ' ' .
A typical image carrier used in screen printing
consists of a screen made from a very finely woven fabric. The
image is defined by a stencil or mask,which is adhered, to the
fabric screen. Ink will pass through the fabric except where the
stencil is applied, thus forming an image on the printing
substrate. The fabric is typically stretched taught over a wooden
or metal frame. The resulting shallow container formed by the
frame will hold a quantity of ink which is pressed through the
fabric by a squeegee that is .drawn across the screen by the.
printing press.
a. Screen Fabrics
Silk was the original material used to make
screens for screen printing. Today, various synthetic material are
the dominant screen materials., By far the most widely used fabric
is monofilament polyester followed by multifilament polyester and
nylon. Other screen materials include: calendared monofilament
polyester, metallized monofilament polyester, carbonized polyester,
glass, wire mesh, and stainless steel. Screens made of the same
material can differ in thread diameter, number of threads-per-inch,
.and choice of mono- or multifilament fibers. Need for various
characteristics such as wearability and dimensional stability will
help determine the fabric selected for a particular screen printing
job. Diameter of mesh thread and number of threads per inch
determine the amount of ink transferred to the substrate during the
printing process (Buonicore and SPAI 1991).
b. Stencils
The stencil, used to cover the non-printing
area of the screen, must be of a material that is impermeable to
the screen printing ink. Materials used for stencils include plain
paper, shellac or lacquer coated paper, lacquer film, photographic
film and light-sensitive emulsions. Stencil types available
include: hand-cut film, photographic film, direct coating,
direct/indirect photostencil, and wet-direct photostencil.
A hand-cut film stencil, is made by hand cutting the image
areas from a lacquer film sheet on a paper backing. A liquid
adhesive is then Used to bond the stencil to the screen fabric.
Once the adhesive has dried, the film's paper backing sheet is
removed.
Two types of photographic film, presensitized _and
unsensitized, are available for use in the preparation of stencils.
. • 2-69
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Presensitized film is ready to use as purchased, while unsensitized
film must first be treated with a photosensitization solution. In
preparing the stencil, the film is exposed to a positive film image
in a vacuum frame. It is then developed in a solution that renders
the unexposed image areas soluble in water. The soluble areas are
removed and the remaining film is bonded to the screen fabric.
In the direct coating process, a light-sensitive emulsion is
applied to the entire screen and allowed to dry. The screen is
then exposed to a film'positive image. The non-image areas of the
emulsion harden upon exposure. However, the coating in the
unexposed image areas remains soluble and is removed with a spray
of warm water. Several coats of the light-sensitive material are
applied and smoothed to achieve a long wearing screen.
The preparation of direct^ indirect' stencils combines elements
of both the photographic film and the direct coating methods. An
unsensitized photographic film is laminated to the screen and then
sensitized by the direct application of a photosensitive emulsion.
The exposed stencil is processed in a manner similar -to that used
in the preparation of stencils produced by the photographic film
and the direct coating methods. The direct/indirect process
produces highly durable stencils that are used in applications
where high print quality is required.
,A recent development in.stencil preparation is the wet-direct
photostencil process. To prepare a stencil using this process, &
film positive is held in direct contact with a wet photopolymer
emulsion. The emulsion hardens when exposed to UV light. The
unexposed areas of emulsion are then removed yielding a very
durable, high quality screen.
2. Screen Presses and Printing
Reduced to its basics, screen printing consists of
three elements: the screen which is the image carrier; the
squeegee; and ink. The screen is placed in a wooden, steel, or
aluminum frame and pulled taught. Proper tension is essential to
accurate color registration. The stencil is then applied to the.
non-image areas of the screen to render them impervious to ink.
The image areas remain porous.
The squeegee is a blade that is drawn across the screen to
force ink through its porous image areas and onto the substrate.
Many factors such as composition, size and form, angle, pressure,
and speed of the blade determine the quality of the impression. At
one time most blades were made from rubber which, however, is prone
to wear and edge nicks and has a tendency to warp and distort.
While blades continue to be made from rubbers such as neoprene,
most are now made from polyurethane which can produce as many as
25,000 impressions without significant degradation of the image.
' ' ."'' ' '- •'• '•' ' ''• 2-76"
-------
A significant characteristic of screen printing is that a
greater thickness of the ink can be applied to the substrate than
is possible with other printing techniques. This allows for some
very interesting effects that are not possible using other printing
methods. Because of the.simplicity of the application process, a
wider range of inks and dyes are available for use in screen
printing than for use in any other printing process.
Until relatively recently all screen printing presses were
manually operated. Now, however, most commercial and industrial
screen printing is done on single and multicolor automated presses.
Three types of presses are used by the screen printing industry:
flat-bed (probably the most widely used), cylinder, and rotary.
Flat-bed and cylinder presses are similar in that both use a flat
screen and a three step reciprocating process to perform the
printing operation. The screen is first moved into position over
the substrate, the squeegee is then pressed against the mesh and
drawn over the image area, and then the screen is lifted away from
the substrate to complete the process. With a flat-bed press the
substrate to be printed is positioned on a horizontal print bed
that is parallel to the screen. With a cylinder press the
substrate is mounted on a cylinder (Field 'and Buonicore}.
Rotary screen presses are designed for continuous, high speed
web printing. The screens used on rotary screen presses are
seamless thin metal cylinders. The open-ended cylinders are capped
at both ends and fitted into blocks at the side of the press.
During printing, ink is pumped into, one end of the cylinder so that
a fresh supply is constantly maintained. The squeegee is a free
floating steel bar inside the cylinder and squeegee pressure is
maintained and adjusted by magnets mounted under the press _bed.
Rotary screen presses are most often used for printing textiles,
wallpaper, and other products requiring unbroken continuous
patterns. Figure 25 depicts two types of screen presses, flat-bed
and rotary. ,
Screen printing is arguably the most versatile of all printing.
processes. It can be used to print on a wide variety of
substrates, including paper, paperboard, plastics, glass, metals,
fabrics, and many other materials. The major chemicals used
include screen emulsions, inks, and solvents, surfactants, caustics
and oxidizers used in screen reclamation. The inks used vary
dramatically in their formulations (GATF 1992b). A process flow
diagram as well as information on the chemicals used in this
process are presented in Figure 26.
2-71
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squeegee
»r_
paper sheets
squeegee screen
0 0 ~"U 0
paper roll
magnet force
Figure 25. Flat-bed Screen Press (top) and Rotary Screen Press
(Source: Field 1980. Reproduced by permission of Ayer
Company Publishers, Inc.)
2-72
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4
SCREEN PRINTING
PROCESS FLOW DIAGRAM
ART DESIGN, ORIGINAL PICTURE/FILM
PHOTOGRAPHY,, COLOR SCANNING,
SEPARATION, PROOFING, STRIPPING,
TYPESETTING, PHOTOTYPESETTING
STENCIL & SCREEN PREPARATION
SCREEN MAKING
FOOTPRINT, PRINTING
-SCREEN RECLAMATION
PRODUCT
PREPRESS
PRESS
POSTPRESS
Figure 26. Screen Printing (Source: GATF 1992b).
. - ' 2-73 • '
-------
IllIIIIIII Illlllllll 111
SCREEN PRINTING (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
1. Adhesive, cleaning solvent
Cleaning solvent, film fixer and developer
2.
3.
4.
5.
Mesh preparation compounds, abrading compounds, degreasers, aclhesives,
stencil/emulsion systems, blockout solution
\ .
Screen printing ink, haze remover
Ink remover, stencil remover
Figure 26. Screen Printing (continued)
„ i , ' I
,2-74
-------
SCREEN PRINTING OPERATION (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
Film developer
Film fixer
, Stencil emulsion
Postpress
Screen reclamation
solvents
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Sodium sulfite, sulfosalicyclic acid, potassium hydroxide,
potassium sulfite, hydroquinone, butyl-diemanolamine
Ammonium thiosulfate, sodium acetate, acetic acid,
aluminum sulfate
Polyvinyl alcohol, polyvinyl acetate, benzoate esters, citrate
esters, trihexyl ester acetate, trimethylolpropane triacrylate,
pentaerythritol tetracrylate, sodium citrate, phthalocyanine
pigments, diazonium salts
Glycol ethers, aromatic and aliphatic petroleum distillates,
ketones, esters, mono- and multifunctional acrylate
monomers, acrylate oligomers, isocyanates, acrylic, vinyl,
urethane, styrene, ceUulosic, polyamide, epoxy, polyester
and melamine resins, silicones, amines, pigments
containing lead, chromium, and cadmium
Mineral spirits, toluene, xylenes, limonenes, terpenes,
acetone, methyl ethyl ketone, cyclohexanone, butyrolactbne,
ethyl acetate, butyl acetate, ethylene glycol mono butyl ether
acetate, propylene glycol mono methyl ether acetate,
propylene glycol mono ethyl ether acetate, diethylene glycol
mono butyl ether acetate, dipropylene glycol mono methyl
ether acetate, isoprppanol, diacetone alcohol, benzyl alcohol,
terpineol, ethylene glycol mono methyl ether, ethylene glycol
mono ethyl ether
Figure 26. Screen Printing (continued).
2-75
-------
SCREEN PRINTING OPERATION (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
Postpress (conU
Screen reclamation
solvents (cont.)
Screen reclamation
surfactants
Screen reclamation
caustics
Screen reclamation
oxidizers
Ethylehe glycol mono butyl ether, propylene
glycol mono methyl ether, propylene glycol mono ethyl
ether, propylene glycol mono butyl ether, diethylene glycol
mono ethyl ether, diethylene glycol mono butyl ether,
dipropylene glycol mono methyl ether, dipropylene glycol
mono ethyl ether, dipropylene glycol mono butyl ether,
N-methylpyrrolidone,
Alkybenzene sulphonates, alkyl sulphates, alkyl ether
sulphates, aliphatic phosphate esters, alkyl sulphosuccinates,
alkyl phenol ethoxylates, ethoxylated fatty alcohols, EO-PO
block copolymers, tetra alkylammonium halides/phosphates,
betaines, alkylimidazoline carboxy acids
Sodium hydroxide, potassium hydroxide, sodium
carbonate, trisodium phosphate
Sodium metaperiodate, sodium hypochlorite, periodic
acid, enzymes
Figure 26. Screen Printing (continued)
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3. Volume of 'Output and Percentage of Total Market
In 199.1, screen printing accounted for less than
three percent of the total value of• U.S. printing .industry output
(excluding instant and in-plant printing). Between 1991 and 2025,
screen printing market share is expected to show little or no
growth (Bruno 1991).
4. Number and Relative Size of Printing Companies
The Screen Printing Association International
estimates that there are at least 40,000 plants in the U.S. with
screen presses (Kinter .1993). This estimate does not include an
unknown number of electronics plants that use screen printing in
the production of electronic circuitry (Kinter 1992). The majority
of screen printing plants are small businesses with fewer than 20
employees (Kinter 1993).
F. Plateless Processes
1. Description
The various plateless printing processes are quite
different from the five major conventional printing processes
described above. Unlike traditional processes, the new_processes
do not use printing plates' or any other type of physical image
carrier. Instead, they rely on sophisticated computer software and
hardware to control the printing elements. Currently, however, the
plateless processes are restricted largely to in-plant and quick
printing applications.
In terms of chemical use, the plateless processes have a
number of advantages over traditional printing processes.
Typically, make-ready preparations are done electronically so the
various chemicals associated with prepress operations are largely
avoided. Plateless processes do not require solvent washes and
with a few exceptions (e.g., ink jet printers) dry (solventless)
inks are used. Though the chemicals used in plateless processes
depends on the particular process involved, important chemicals
include . Freon 11, inks, and hydrocarbon based, solvents (GATF
1992b) . A process flow diagreim for electronic printing as well as
information on the chemicals used are presented in Figure 27.
2.
Specific Plateless Processes
A number of commercial plateless_ printing
technologies were identified including: electronic printing, ink
jet printing, magnetography, ion deposition printing, direct charge
deposition printing, and the Mead Cycolor Photocapsule process.
Each of these systems is discussed briefly below.
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ELECTRONIC PRINTING
PROCESS FLOW DIAGRAM
1.
2.
3.
ART DESIGN, ORIGINAL PICTURE/FILM
SEPARATION, PROOFING, STRIPPING
FILM PROCESSING AND ASSEMBLY
-
PRESS MAKEREADY
LABELING, STAMPING, COLLATING,
FOLDING, STITCHING, GLUEING
PRODUCT
~\
PREPRESS
PRESS
POSTPRESS
Figure 27. Electronic Printing (Source: GATF 1992b).
2-78
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ELECTRONIC PRINTING (cont'd)
CHEMICAL/CHEMICAL COMPOUND USAGE
In reference to each step in the process flow diagram:
t
1. None
2. None
3. Cleaning solvent
4. Water and solvent based inks, petroleum hydrocarbon additives, ink depositing
solvents
5. Adhesive
Specialty operations:
Ink jet (water and solvent based inks),
Laser printer (freon and acetone),
Electropress (solvent based inks and petroleum based ink
solvents)
Figure 27. Electronic Printing (continued) .
. • 2-79
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ELECTRONIC PRINTING (cont'd)
MAJOR CHEMICALS USED
Operation/Process
Prepress
None
Press
Ink
Processing
material
Wash solvent
Postpress
Glue
Major Chemicals Used (Volumes of
Individual Chemicals Used Vary Greatly)
None
Petroleum distillates, isopropanol, aliphatic and aromatic
hydrocarbons, pigments
Freon 113, acetone, petroleum hydrocarbons,
Aliphatic and aromatic hydrocarbons, ethanol, mineral spirits,
acetone, isopropanol
Paraffin wax
Figure 27. Electronic Printing (continued)
2-80
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a. Electronic. Printing
The. most important electronic processes are
xerographic and laser printing. With one major exception,
xerographic and laser printers operate on similar principals. In
both processes an image is recorded on a drum in the form of an
electrostatic charge. The electrostatic charge is then transferred
to a sheet of some material, generally paper. A conductive fine
dry powder, the toner, is then spread on the paper. The toner is
attracted to the electrostatically charged areas of the paper,
thereby converting the electrostatic image into a visual one. The
paper is then heat treated to melt and affix the toner to the paper
(Adams 1988; Bruno 1990; Hawley 1981).
Laser printing and xerography differ in how the image is
inputted and how the electrostatic image is formed on the drum. In
xerography, light reflected off a hard copy of the text or
pictorial image (e.g., a printed or illustrated page) is projected
on to the drum though a camera lens. In laser printing the image
is inputted in digital form from a computer. A laser is then used
to project the image onto the drum (Adams 1988; Bruno 1990; Hawley
1981).
The input and output capabilities of electronic printing
continue to improve. For example', raster image processing has made
the integration of text and graphic images much easier. (Until
recently, most computer output devices formed text and graphic
images as a series of dots. With raster image processing, the
image is formed as a series of lines.) The resolution of laser
printers is good but still falls far short of the ' resolution
achieved with phototypesetters. To produce high quality
reproductions of fine type and halftone screen images, a resolution
of at least 1,500 line per inch is required. However, in 1990, the
highest resolution laser printers could achieve was a density of
1,200 X 600 dots per inch (dpi) while most achieved resolutions of
only 300 X 300 dpi.
Currently, electronic printing is used, primarily for short-run
in-plant and quick printing. Another use is for the production of
proof copies of printed materials which will be printed using one
o'f the. traditional printing technologies. These proof copies' are
much less expensive than phototypeset proofs. In desktop
publishing, electronic printing is often used to produce a camera
ready copy of a document that is then printed using one of the
traditional printing technologies. According to Michael Bruno, the
current markets for desktop publishing include demand publishing,
book review copies, college texts, workbooks, technical manuals,
and parts catalogs (Adams .1988; Bruno 1990).
2-81
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iiiiiiiiiiiiiii
b." Ink-jet Printing
Ink-jet printers operate by spraying a pattern
of individual ink droplets onto a substrate. The application of
the dot matrix image is controlled by computer input. The twp-
types of ink-jet printers differ in whether the "jet" of ink
droplets is continuous, or occurs only when a drop of ink is needed
to form part-of the dot matrix image. In continuous spray systems,
an electric charge is used to deflect ink drops not needed to form
the image to an ink recycling unit. In a drop-on^demand system,
drops of ink are produced only when they are needed to form part of
the image. Drop-on-demand systems are less complicated than
continuous systems and use less ink; however, they print much more
slowly (Adams 1988).
The advantage of ink-jet printing is the speed with which it
can do addressing and print variable information on repetitive
forms. For these reasons ink-jet printers are credited with
revolutionizing the direct mailing business. Other applications
include printing bar and batch codes and printing variable
information on computer letters, sweepstakes forms, and other
personalized direct mail advertising as well as on payroll checks
and other business forms. Furthermore, because it is a non-impact
printing process, jet-printers can be used to print on almost any
surface despite the material, texture, shape, or resistance to
surface pressure. Because of this versatility, ink-jet printing is
used to print on substrates as varied as p-£as£j_cs^ sandpaper, and
pills (i.e., Pharmaceuticals) (Adams 1988; Bruno 1990).
The major disadvantage of ink-jet printers is the low
resolution of the images produced. The poor resolution is the
result of at least three factors: even on the best machines no
more than 300 dots per square inch are possible; a certain percent
of the dots applied are misdirected; and the dots of inks used tend
to spread as they dry (Adams 1988). ;
c.
Maqnetoqraphv
Magnetography is similar to electronic printing
except that a magnetic, and not an 'electrostatic, photoconductor is
used. T,he toner must, of course, be magnetic material. Magneto-
graphic printing is competitive with traditional printing methods,
such as lithography, for small runs of up to about 1,500 copies.
Drawbacks include slow speed, high toner costs, and the 'inability
of currently available printers to do color process printing .(Bruno
1990) . ' ,
2-82
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d. Thermal Printing
.In thermal printing, an image is formed by a
chemical reaction that occurs when portion^ of a thermal-coated
paper are subjected to heat. The printing element consists of one
or more heated pins or nibs. Currently thermal printers find use
in facsimile machines and other office applications. A shortcoming
of thermal print is that it tends to fade over time. In certain
applications such as fax machines, thermal printers are being
replaced by electronic printers using plain paper (GATF 1992b).
e. Ion Deposition Printing
The ion deposition process is similar to
electronic printing and other electrostatic processes. The four
basic steps of the process are: 1) an electrostatic image is
generated on a rotating drum using a directed array of ions; 2)
toner is attracted to the latent image on the drum; 3) the toned
image is transferred to plain paper by cold pressure fusion; 4)
toner residue is removed from the drum by a doctor blade and the
drum is ready for re-imaging (Bruno 1990).
Ion deposition printers are used in various business
applications such as printing invoices, reports, manuals, forms,
letters and proposals as well as in specialty printing applications
such as tags, tickets, and checks (Bruno 1990).
f. Direct Charge .Deposition Printing
."..",' In direct charge deposition printing, the image
is generated by a direct voltage carried by ionized, air. The
process differs from ion deposition printing in that the image is
projected on to a dielectric belt and not a drum. A major
advantage of the direct charge deposition printers is the
durability of both the dielectric belt and the imaging head which
can produce up to 200,000 pages and five million^ pages,
respectively, before replacement. This technology is used
primarily for printing business forms (Bruno 1990).
g.. Mead Cvcolor Photocapsule Process
The Mead Cycolor Photocapsule Process combines
microencapsulation technology used in carbonless copy paper with
photopolymerization technology found in UV • curable inks. The
process uses two coated materials, the Cycolor film and the Cycolor
receiver sheet. The coating on the Cycolor film is embedded with
millions of microcapsules that contain a liquid acrylic monomer, a
yellow, cyan, or magenta leuco dye base, and one _ of three
photoinitiators. Each of the photoinitiators is sensitive to the
2-83
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spectrum of visible light corresponding to the final color of the
leuco dye itself. Leuco dyes are dyes which have been rendered
colorless by the addition of a chemical group referred to as a
color block. The color block can be removed and the appropriate
color developed by reacting the dye with an acid. When the cycblbf
film is exposed to colored light, the photoinitiators sensitive to
the particular color cause the monomer to polymerize and harden.
The contents of the unexposed microcapsules remain in a liquid
state (Bruno 1990).
The Cycolor receiver sheet is coated with an acid resin that,
during processing, reacts with the leuco dyes in the film to remove
the color blocks and form color dyes. The receiver sheet can be
either paper or a transparency.To print the receiver sheet, it
and the exposed Cycolor film are brought into contact under
pressure by feeding them between two rollers. The pressure breaks
the unexposed microcapsules on the film, releasing the colorless
leuco dyes, monomer, and photoinitiator. Subsequently, the leuco
dyes react with the coating on the receiver sheet to form colored
dyes and the monomer hardens as well. The result is a continuous
tone color image (Bruno 1990).
Currently, the Cycolor process is used for color copiers, 35mm
slide printers, color computer printers for desktop printing, and
color video output for electronic imaging (Bruno 1990).
3. Volume of Output' and Percentage of Total Market
• In 1991, the various plateless printing processes
accounted for only three percent of the total value of U.S.
printing industry output (excluding instant and in-plant printing) .
However, plateless printing is expected to experience explosive
growth "over the next 35 years and is forecast to account for 21
percent of the market by 2025 (Bruno 1991).
1 •" ! , ". ' ". . I MM'
4. Number and'Relative Size of Printing Companies
No information was found on the current number or
relative size of companies or plants using plateless printing
processes. However, many of these processes, especially
xerographic, electronic, and ink-jet printers, are widely used by
thousands of "quick" printing services, the majority of which are
small businesses. These printing technologies are also_used on an
enormous scale in the office environment and their use in the home
is becoming commonplace.
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TV. POSTPRESS OPERATIONS
A. Introduction JS
Postpress operations consist of four major processes:
cutting, folding, assembling, and binding. Not all printed
products, however, are subjected to all of the processes. For
example, simple folded pamphlets do not undergo binding.
There are many additional lesser postpress finishing processes
such as varnishing, perforating, drilling, etc. Some types of
greeting cards are dusted with gold bronze. Printed metal products
are, formed into containers of various sizes and shapes. Many metal
toys are prepared in the same manner. Containers may also be
coated on the inside ,to protect the eventual contents. Other
substrates may be subjected to finishing processes that involve
pasting, mounting, laminating, and collating. There are also a
number of postpress operations unique to screen printing including
die cutting,, vacuum forming, and embossing.
* A limited number and volume of chemicals are used in postpress
operations. The major type of chemicals used in postpress are the
adhesives used in binding and other assembly operations. Because
chemical usage is limited, only a brief overview of each of the
four major postpress operations is provided in the following
sections. In-line finishing, an automated process that links the
press directly with postpress operations, is also discussed.
B. Cutting
The machine typically used for cutting large web-type
substrates into individual pages or sheets is called a guillotine
cutter or "paper cutter". These machines are built in many sizes,
capacities, and configurations. In general, however, the cutter
consists of a flat bed or table that holds the stack of paper to be
cut. At the rear of the cutter the stack of paper rests against
the fence or back guide which is adjustable. The fence allows the
operator to accurately position the paper for the specified cut.
The side guides or walls of the cutter are at exact right angles to
the bed. A clamp is lowered into contact with the top of the paper
stack to hold the stack in place while it is cut. The cutting
blade itself is normally powered by an electric engine operating a
hydraulic pump. However, manual- lever cutters are also still in
use.
To assist the operator in handling large reams of paper which
can weigh as much as 200 pounds, some tables are designed to blow
air through small openings in the bed of the table. The air lifts
the stack of paper slightly providing a near frictionless^ surface
on which to move the paper stack.
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The cutter operator uses a cutting layout to guide the cutting
operation. Typically, the layout is one sheet from the printing
job that has been ruled to show the location and order of the cuts
to be made. , " .
Though cutting is generally considereda pbstpress bperation,
most lithographic and gravure web presses have integrated cutters
as well as equipment to perform related operations such'as slicing
and perforating. ' ' • '
1 C. Folding '
Folding largely completes postpress operations for
certain products such as simple folded pamphlets. Other products
are folded into bunches, known as signatures, of from 16 to 32
pages. Multiple signatures are then assembled and bound into books
and magazines. Though folding is generally considered a postpress
operation, most lithographic and gravure web presses are equipped
with folders". ' - ' _'
Three different folders are used in modern print shops.
They range in complexity from thei bone "folder•'"to the buckle folder.
Bone folders have been used for centuries and are made of either
bone or plastic. These folders are simple shaped pieces of bone or
plastic that are passed over the fold to form a sharp crease.
Today, they continue to be used, but only for .small, very high
quality jobs.' ' _ '
Knife folders use a thin "knife to force the paper between two
rollers that are counter-rotating. This forces the paper to be
folded at the point where the knife contacts it. A fold gauge and
a moveable side bar are.used to position the paper in the machine
before the knife forces the paper between the rollers. The rollers
have knurled surfaces that grip the paper and crease it. The paper
then passes out of the folder and on to a gathering station.
Several paper paths, knives and roller sets can be stacked to
create several folds on the same sheet as it passes from one
folding station to another.
Buckle folders differ from knife folders in that the sheet is
made to buckle and pass between the two"rotating rollers of its own
accord. In a buckle folder, drive rollers cause the sheet to pass
between a set of closely spaced folding plates. When the sheet
comes in contact with the sheet gauge, the drive rollers continue
to drive the paper causing it to buckle over and then pass between
the folding rollers.
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D.
Assembly
The assembly process brings all of the printed and non-
printed elements of the final product together prior to binding.
Assembly usually includes three steps: gathering, collating, and
inserting. . .
Gathering is the process of placing signatures next to one
another. (A signature is a bunch of printed sheets ranging from 16
to 32 pages.) Typically, gathering is used for assembling books
that have page thicknesses of at least 3/8 inch.
Collating is the process of gathering together individual
sheets of paper instead of signatures. .
Inserting is the process of combining signatures by placing or
"inserting" one inside another. Inserting is normally used for
pieces whose final thickness will be less than one-half inch.
Assembly processes can be manual, semiautomatic or. fully
automatic. In manual assembly operations, workers hand assemble
pieces from stacks of sheets or signatures laid out on tables.
Sheets or signatures are picked up from the stacks in the correct
order and either gathered, collated, or 'inserted to form bindery
units. Some printers use circular revolving tables to as'sist in
this process. However, due to the high cost of labor, manual
assembly is used only for small jobs.
Semiautomatic assembly is completely automated except that
stacks of sheets or signatures must be manually loaded into the
feeder units. During semiautomatic inserting, operators at each
.feeder station open signatures and place them at the "saddlebar" on
a moving conveyer. The number of stations on the machine is
determined by the number . of signatures in the completed
publication. Completed units are removed at the end of the
conveyer and passed on to the bindery.
Automatic assemblers are similar to semiautomatic units except
that a machine and not a person delivers the sheets or signatures
to the feeder station and places them on the conveyor. In order to
improve efficiency, automatic assemblers are typically placed in
line with bindery equipment.
E. Binding
Binding is categorized by the method used to hold units
of printed material together. The three most commonly used methods
are adhesive binding, side binding, and saddle binding. Three
types of covers are available to complete the binding process:
self-covers, soft-covers, and casebound covers.
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1. Binding Methods
Adhesive binding, also known as padding, is the
simplest form of binding. It is 'used for note pads and paperback
books, among other products.
"HI*II I1 '"I," iiiviiJL'lIIII >
In the adhesive binding process, a pile of paper is clamped
securely together in a press. A liquid glue is then applied with
a brush to the binding edge. The glue most commonly used in
binding is a water-soluble latex that becomes impervious to water
when it dries. For note pads, the glue used is flexible and will
easily release an individual sheet of paper when the sheet is
pulled away from the binding. Adhesive bindings are also used for
paperback books, but these bindings must be strong enough to
prevent pages from pulling out during normal use. For paperback
book binding, a hot-melt glue with much greater adhesive strength
than a water-soluble latex is applied. A piece of gauze-like
material is inserted into the glue to provide added strength.
In side binding, a fastening device is passed at a right angle
through a pile of paper. Stapling is an example of a simple form
of side binding. The three other types of side binding are
mechanical, loose-leaf, and side-sewn binding.
A common example of a form of mechanical binding is the metal
spiral notebook. In this method of binding, a series of holes are
punched or drilled through the pages and cover and then a wire is
then run through the holes. Mechanical binding is generally
considered as permanent; however, plastic spiral bindings are
available that can be removed without either tearing the pages or
destroying the binding material. Mechanical binding generally
requires some manual labor.
Looseleaf bindings generally allow for the removal and
addition of pages. This type of binding includes the well known
three-ring binder.
Side-sewn binding involves drilling an odd number of holes in
the binding edge of the unit and then clamping the unit to prevent
it from moving. A needle and thread is then passed through each
hole proceeding from one end of the book to the other and then back
again to the beginning point. This type o'f stitch is called a
buck-stitch. The thread is tied off to finish the process. Both
semiautomatic and automatic machines are widely used to perform
side-stitching. The main disadvantage of this type of binding is
that the book will not lie flat when opened.
In saddle binding one or more signatures are fastened along
their folded edge of the unit. The term saddle binding comes from
an open signature's resemblance to an inverted riding saddle.
Saddle binding is used extensively for news magazines where wire
stitches are placed in the fold of the signatures. Most saddle
••• ' '••• " •• '2-88'" ' " ' '
-------
stitching is performed automatically in-line during the postpress
operations. Large manually operated staplers are used for small
printing jobs.
Another saddle binding process called Smythe sewing is a
center sewing process. It is considered to be the highest quality
fastening method used today and will produce a book that will lie
almost flat.
2.
Covers
Self-covers are made from the same material as the
body of the printed product. Newspapers are the most common
example of a printed product that uses self-covers.
Soft covers are made from paper or paper fiber material that
is somewhat heavier or more substantial than the paper used, for the
body of the publication. This type of cover provides only slight
protection for the contents. Unlike self-cover, soft covers almost
never contain part of the message or text of the publication. A
typical example of the soft cover is found on paper-back books.
These covers are usually cut flush with the inside pages and
attached to the signatures by glue, though they can also be sewn in
place.
Casebourid covers are the rigid covers generally associated
with high-quality bound books. This method of covering is
considerably more complicated than any of the other methods.
Signatures are trimmed by a three-knife trimming machine to produce
three different lengths of signature. This forms a rounded front
(open) edge to give the finished book an attractive appearance ,and
provides a back edge shape that is compatible with that of the
cover. A backing is applied by clamping the book in place and
splaying or mushrooming out the fastened edges of the signatures.
This makes the rounding operation permanent and produces a ridge
for the casebound cover. Gauze and strips of paper are then glued
to the back edge in a process called lining-up. The gauze is known
as "crash" and the paper strips are called "backing paper." These
parts are eventually glued to the case for improved strength and
stability. Headbands are applied to the head and tail of the-book
for decorative purposes.
The case is made of two pieces of thick board, called binder's
board, that is glued to the covering cloth or leather. The
covering, material can be printed either before or after gluing by
hot-stamping or screen methods.
The final step in case binding consists of applying end sheets
to attach the case to the body of the book.
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F. In-Line Finishing
Historically, the finishing operations described above
were labor-intensive operations handled either in-house or by trade
shops. Even when performed in-house, finishing operations
generally were not integrated with the presses or with each other.
Today, web presses are often linked directly to computer controlled
in-line finishing equipment. Equipment is available to perform
virtually all major post-press operations including cutting,
folding, perforating, trimming, and stitching (Adams).
In-line finishing equipment can also be used to prepare
materials for mailing. The computer can store and provide
addresses to ink-jet or label printers, which then address each
publication in zip code order (Adams).
One of the most important results of computer in-line
finishing is the introduction of demographic binding, the selective
assembly of a publication based on any one or more of a number of
factors including geographic area, family structure, income, or
interests. For example, an advertisement will appear only in those
copies of a magazine intended for distribution in the advertisers
selling area. Demographic binding has proven to i>e a successful
marketing tool and is already widely used, especially by major
magazines (Adams).
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One comparison found that the use of in-line finishing
equipment can reduce the number of operators and helpers required
for an off-line finishing operation by almost half, while at least
doubling the rate of production (Adams).
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V. TECHNOLOGICAL TRENDS
The print ing'Indus try has been experiencing a period of change
that promises to be greater than any it's experienced since the
introduction of automated printing presses. Much of the change is
3eing fueled by the already widespread and still rapidly growing
application of computers to the printing industry. Major trends
include:
Prepress
o Continued rapid development in computer-based front-end
platforms that allow users to create, manipulate, and
store text, graphic images, and entire documents prior to
printing; .
o Improved telecommunications and introduction of' digital
data exchange standards that will allow the exchange of
text, graphics,, and entire documents between different
press systems;
Development of
technologies;
direct-to-plate and direct-to-press
Press
Increasing automation of press operations;
Introduction of waterless lithographic plates that do not
require a dampening system;
Introduction of a new generation of low- or no VOC non-
alcohol fountain solutions and of low-VOC press cleaners;
Growing use of low- or no VOC ink technologies such as
vegetable oil- and water-base inks, high-solids inks,
ultraviolet and electron beam curable inks, and
chemically, reactive inks;
Overall trend toward reduction or replacement in the
press room of chemicals that pose a potential hazard to
human health or the environment;
Increased recycling of ink;
market
Ma j or growth
technologies ;
in
for plateless printing
Postpress
o Increasing automation of postpress operations;
o Growing use of in-line finishing; and
o Increasing use of water-base adhesives.
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TECHNOLOGICAL TRENDS
IN THE PRINTING INDUSTRY
PREPRESS
Rapid development in computer-based front-end platforms (e.g. desktop
publishing)
Improved telecommunications and introduction of digital data exchange
standards
Direct-to-plate and direct-to-press technologies
PRESS
Automation
Waterless lithographic plates that do not require dampening systems
New generation of non-alcohol fountain solutions and low-VOC press
cleaners .
Low- or no VOC ink technologies such as vegetable oil- and water-base
inks, high-solids inks, ultraviolet and electron beam curable inks, and
chemically reactive inks
Ink recycling
Plateless printing technologies
Reduction in the use of materials that pose a potential hazard to human
health or the environment
POSTPRESS
Automation
In-line finishing
Water-base adhesives
Figure 28. Technological Trends in the Printing Industry
2-92,
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In the following sections, new products, emerging
technologies, and other factors affecting the printing industry are
explored in more detail.
A. Trends in Prepress Technology
Prepress technologies made major strides in the late
1980s and early 1990s and rapid progress will continue throughout
the current decade. Most of the prepress tasks at both prepress
shops and printers are - now performed using a combination of
computer hardware and software commonly referred to as a front-end
platform (Bruno 1990; SRI 1990).
1.' Front-End Platforms (Desktop Publishing)
Front-end platform (FEP) is a term used by, the
industry to describe the combination of desktop computer hardware
and peripherals and sophisticated software that allow users ^ to
create, manipulate, and store text, graphic images, and entire
documents prior to printing. These systems are found not only in
the printing industry but in literally thousands of homes and
offices across the country, FEPs and desktop publishing will
continue to develop and grow in importance well into mid-decade
(SRI 1990).
Using FEPs, the lay person can perform many prepress
operations and produce a high quality copy ready for printing.
When used properly, a primary benefit of this emerging technology
will be a significant reduction in the cost of producing lay-outs
ready for the plate maker. This, in turn, will make it profitable
for printers to -accept shorter-run jobs. According to the Graphic
Arts Technical Foundation (GATF), however, lay persons rarely use
FEPs properly when preparing materials for printing. Instead their
limited'knowledge of the printing process often creates, more work
for the printer (Jones 1993).
Important new products available for prepress functions
include: ,
o Graphics-oriented Workstations. FEPs, now based largely
on low-cost personal computers, will .evolve -toward
graphics-oriented workstations rurining production-level
software. The software will be based on products
originally developed for CAD/CAM applications (Bruno
1990; SRI 1990). ,
p Color Electronic Prepress Systems (CEPS). CEPS provide
the capability to perform complete color page makeup
including color balciricing -and correction. Newer systems
will be priced economically thus reducing the price-per-
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printed-page. CEPS willbe capable of performing
integrated text and graphics functions in both black and
white and color. It will be possible to fully network
CEPS with other digital equipment including-, for example,
modems for telecommunications, and directly-driven image
carrier preparation systems (Bruno 1990; SRI 1990).
Digital Scanners. _ i Lower cost flat-bed scanners,, are
expected to largely replace the drum scanners in new
systems by,1994. These systems use charge-coupled device
(CCD) technology as the primary imaging element. Flat-
bed scanners will be used in both color and black and
white work and will be capable of scanning a complete
page at a time. These systems will be driven by either
personal computers, graphics workstations, or CEPS.
Initially, the cost of these systems will be high, but
will probably decline to levels affordable to the small
to medium size print shop by mid-decade (SRI 1990).
2. Telecommunications
'.,••.. I II I I I II I Illl I I I II I I I I I I III III
„, ' ' „''',' .4 1
According to a report prepared for the Printing 2000
Task Force, by 1995 prepress systems will be able to transmit text7
graphic images, and even entire documents between different
printers' hardware systems (SRI 1990). Already, two ANSI standards
for digital data exchange in the printing industry have been
published and four additional standards are uiider deveTiopinent
(Bruno 1990)-.
Continuing improvements in high-speed/highvolume
telecommunications coupled with the growing, use of jfronf-end
platforms will lead to the increasing globalization of the printing
and publishing industries. More and more frequently customers will
use printers located at great distances or even in foreign
countries (SRI 1990).
3. Proofing
The increasing use of telecommunications and local
area networks, coupled with workstations, will result in faster,
more accurate proofing of materials being readied for the press at
a significant reduction in cost. Remote or "soft" proofing (i.e.,
proofing from an electronic medium as opposed to a hardcopy), will
be used in initial checking of materials.
During the 1990s it will become possible to produce high-
quality color proofs from digital inputs. Advances in digital
proofing will be facilitated by the continuing development of high
quality ink-jet printers to produce color and black-and-white
2-94
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proofs. The ink-jet technology will be particularly useful to
:extile houses, architectural firms, and advertisers (SRI 1990).
4^ Direct-to-Plate and Direct-to-Press Technologies
A variety of techniques that allow the direct
application of an image to a printing plate or other image carrier
without'various intermediate steps are under development or just
sntering commercial use.
Direct-to-plate (or computer-to-plate) technology is expected
to play a major role in offset printing by the mid-19.90s. The
introduction of direct-to-plate processes in offset printing does
lot require additional technological breakthroughs. Instead, it.
calls for the integration and refinement of existing technologies.
Image laser setters are available as are silver and zinc oxide
plates sufficiently sensitive for use in the direct-to-plate
process. Additional refinements required'include modification of
Laser image setters to accommodate a wider range of materials,
greater laser power, and increased plate coating sensitivities.
rhese improvements coupled with photopolymer plates will allow the
introduction, of digital-to-plate technology to traditional
commercial printing operations (SRI 1990)... Large and medium size
printers are expected to move rapidly to the use of direct-to-plate
technologies. The trend will then slow significantly as smaller
printers (20 or fewer employees), which account for the majority of
printing plants., make the transition (Purcell)-.
In addition to direct-to-plate technologies, direct-to-press
(or computer-to-press) systems are now becoming available. In
these systems, computer controlled equipment allow the application
of the image directly to the printing cylinder while the cylinder
is mounted on the press. For example, Heidelberg USA has a press
that includes an imaging system that will create a waterless plate
directly on the press unit. The use of this and similar systems
are reported to result in major reductions in plate preparation
time as well as press downtime (Petersen 1992).
By the mid-1990s, as much as 7 percent of all printed material
will be produced using direct-to-plate systems. Some industry
analysts expect this to increase to as much as 50 percent by 2000
(SRI 1990). However, as noted above, other analysts are less
optimistic because they expect the transition to direct-to-plate
technology to be slow among the large number of small .printers
(Purcell).
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B.
Trends in Press Technology
1. • General Press Trends
a.
Inks
'• ''*' " • ' The major ""environmental reictof "driVing the'
development of new ink technologies is the need to reduce VOC
emissions which are subject to increasingly stringent state and
Federal regulations. In response to VOC requirements and other
health, safety, and environmental concerns with solvents and
pigment systems, new and, improved vegetable oil-based and water-
based inks will appear during the 1990s and currently available
ultraviolet and electron-beam curable inks'will be widely used by
all the major printing technologies. In general, the new inks will
resist smearing, emit fewer volatile organic compounds, and make
the use of color in new markets possible (Bruno 1990; SRI 1990).
Inks based on soybean oil are increasingly popular in the
U.S., where they are currently used mainly in nonheatset web offset
printing. 'ln"l987, five newspapers were experimenting with soy-
based inks in the U.S.; by 1990 these inks were being used by_over
1,000 newspapers. Newspapers use primarily color soy-based inks,
replacing inks based on petroleum distillates (Bruno 1990).
Water-based inks generally contain small amounts of solvents,
typically analcohol. Water-based screen printing inks, however,
do not contain alcohols: Although water-based inks are now used
primarily in flexographic and gravure packaging printing, their use
is spreading to other areas'of printing except lithography. Water-
based .inks can not be used in lithographic printing because the
process depends on the affinity of the image area of the plate for
oil-based inks and of the non-image area for water (Branco;
Centaur;' Kinter 1993';"' SRI 1990) "
Another approach being taken by industry in reducing VOCs is
the use of high solids ink, particularly for certain products
printed using heatset lithography. By increasing the solids (i.e.,
pigment and/or resin) content of the,.ink, the solvent level can be
reduced from as much as 45 percent by weight to 30 percent
(Centaur; McGraw-Hill).
A number of no-solvent technologies that "emit, no VOCs are also
available including ultraviolet (UV) and electron beam (EB) curable
inks. UV and EB inks polymerize or "cure".,upon exposure to the
energy source indicated by their names. In general these inks
consist of an oligomer, a reactive diluent (usually a
multifunctional acrylate) , and a pigment. UV inks also require a
photoinitiatbr. A number of health risks are associated with
exposure to the multifunctional acrylates found .in these inks. UV
and EB inks are generally more expensive than conventional inks and
the capital costs of the curing equipment is high. However,.the
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111 111 III 111 111 111 111 I
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curing systems use much less energy than the drying systems often
required for conventional inks. Additionally, UV and EB inks dry
almost instantaneously so their use. can increase productivity.
These 'inks provide high gloss print that is both chemical and
abrasion resistant. UV and EB inks are used in lithography, screen
printing, letterpress, and flexography (Centaur; GCIU; McGraw-Hill;
SRI 1990) .
Another no-solvent technology is chemically reactive inks.
Typically, these are two component systems that polymerize upon
mixing. To date, however, chemically reactive inks have found only
very limited commercial use (McGraw-Hill).
b. Dampening Systems
Since the 1950s, isopropyl alcohol (IPA) has
been widely used in fountain solutions for dampening systems on
lithographic presses. However, due to increasingly strict state
and Federal control of VOCs, the trend is towards the use of
alcohol-free fountain solutions. Glycol ethers have been the
primary replacement for alcohols in fountain solutions. 2-Butoxy
ethanol, a glycol ether, is currently the major substitute for IPA;
however," its use requires process changes (Branco; Petersen 1991).
Another alternative is waterless plates that do not require
the use of dampening systems. Waterless plates are discussed in
more detail in section IV.B.2,a of this report.
c.
Press Cleaners
. Currently,, there are three primary categories
of press cleaners: chlorinated solvents, aromatic petroleum
distillates, and aliphatic petroleum distillates.' Potential
substitutes include: 2-butoxy ethanol; N-methylpyrrolidone; D-
limonene; and low vapor pressure mixtures of aliphatic and aromatic
petroleum distillates (Branco). .Others consist of surfactants,
surfactant and solvent mixtures, or non-volatile oils such as
vegetable oil (Hicks; Petersen 1991).
Traditionally, presses have been cleaned manually. Today,
however, automatic press cleaning systems are widely available.
Compared to manual cleaning of presses, these systems shorten press
down-time and reduce (though do not eliminate) solvent use (Hicks) .
Most newspapers now use dry-type. (i.e., solventless) automatic
blanket washers. According to industry sources, while dry systems
do not clean as well as manual or automatic systems using solvents,
they are viable substitutes (Hicks).
' 2-97
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d.
Process Color
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Process color techniques allow the creation of
virtually any color by overprinting some combination of translucent
inks of only four colors: cyan, magenta, yellow, and black.
Improvements in turnaround time and quality will cause the use of
process color to grow in the 1990s. This growth will be fed by the
continued preference of consumers for color images in daily
newspapers and news magazines. Other factors include:
technological developments that allow economies in short-run^of fset
color printing, new prepress systems for processing color images,
and the availability of acceptable quality from laser printers and
color copiers . Other factors that will contribute to the growth of
process color including: the development of water-based and
vegetable oil-based inks suitable for use in all major printing
processes and the introduction of integrated prepress systems that
simplify the preparation of color pages and reduce color processing
costs (SRI 1990) .
2. Offset Printing
in the 1990s, there are expected to be modest
improvements in offset platemaking and ink technology. The major
trend in lithographic printing, however, will be in the automation
of printing press operations (SRI 1990) .
Microcomputer technology will be employed in the areas of data
collection and process control. Microcomputers now available _ run
at the speeds required to monitor and adjust the operation of high-
speed presses. Furthermore, extremely sensitive and responsive
sensors are now available that are capable of monitoring the
performance of printing presses in 'real-tiiae. These two
technologies have been integrated to create closed-loop control
systems that can monitor and control nearly every aspects of the
modern high-speed press (SRI 1990).
During the 1990s, the increasing application of automation to
offset printing will increase speed, reduce waste and improve
quality as well as reduce labor requirements. Areas where
automated monitoring or control are either being implemented or
studied include (SRI 1990) :
changing and unloading;
o
o
o
Paper roll replacement;
Inking control;
Temperature control of inks, water, press dryers, and
chill rollers;
2-98
PI'
-------
o Registration;
o Paper speed.and tension control;
o Press cleaning; : •
o Web tear detection; and
o In-line finishing. •
Waterless plates, an important development in lithographic
plates, are discussed below. Other changes in 'offset technology'
will include modest improvements in plate technology, including the
commercial introduction of laser-exposed plates and wider presses
that will allow faster printing speeds (2500 'to 3000 feet per
minute) and signatures of up to ,72 pages (SRI 1990).
a. Waterless Plates . ,
Waterless plates are a type of lithographic
plate that requires no water to prevent the non-image areas of the
plate from accepting ink. The non-image areas of waterless plates
are coated with silicone rubber which has such low surface energy
that it will not be wet by ink. However, early waterless plates,
introduced in the U.S. in 1970, had poor scratch resistance and
durability. Furthermore, they were sensitive to heat, and elevated
temperatures caused toning of non-image areas. These plates were
withdrawn from the market in 1977. A second generation of plates
was introduced in Japan in the late 1970s that largely overcame
these problems. Today waterless plates are in widespread use _in
Japan and are beginning to achieve commercial acceptance in the
U.S. (Bruno 1990; Stanilus).
Waterless plates require the use of special waterless inks
based on high viscosity modified phenolic or modified hydrocarbon
resins arid high boiling point nonaromatic or alpha-olefin
hydrocarbon solvents. The inks are higher viscosity than
conventional offset inks. Because of their special rheological
properties, the inks need to be maintained within a narrow range of
temperatures during printing,. For this reason presses using
waterless plates must be equipped with chillers (cooling systems)
or printers must .stock a variety of inks designed for use under
different temperature conditions (Lustig and Stanulis). Cooling
systems are optional on most new presses and retrofitting of
existing units is usually possible (Toray).
There are disadvantages to using waterless plates: the plates
are more expensive and less durable than conventional lithographic
plates and'processors for waterless plates run about $40,000. The
inks used are also more expensive. Furthermore, chillers for
presses using waterless plates cost between $60,000 and $100,000
2-99
-------
....... ,!!;.: ..... I ill!::,:1,: •' •",!,! '' ilfff'ili* TI'iH IfL'iil'H'
.
M!!*'!' ''! ..... 'Lali "J"i ; "'It ''"
lliHil'M I'KIIII!!!"!!1 .............. Mini
(American Printer and Branco). This technology' has increased
energy requirements over .traditional technology. Plate and ink
chemistry differences also need to. be examined(Kalima 1993).
From an environmental and health and safety standpoint, the
advantage of waterless plates is they do not require dainpening and,
therefore, print without the alcohol and other chemidals used in
dampening systems (Stanilus). However, theplatedeveloping
chemistry issolvent based (Jones 1993].
3. Rotogravure Printing
iiiiii i HiII111 ill
A steady decrease in the time required for cylinder
preparation as well as increasing automation will keep rotogravure
competitive with both lithographic offset and flexographic
printing. ' ' ; ' : '
Historically, the major disadvantage of the gravure process in
comparison to other printing processes has been the substantially
greater amount of time required- for cylinder preparation.
Automation and the development of a number of direct-to-cylinder
preparation techniques have reduced the time required for cylinder
preparation; however, gravure still remains uneconomical for
smaller press runs. The minimum number of impressions is usually
dictated by economics and the type of product'. tLS".publication
gravure printers seldom print below 500,000 copies while in other
parts of the world publication print orders of 100,000 to 200,000
copies are. not uncommon. On the other hand, a specialty gravure
(i.e., wall covering) run may total only a few; hundred' yards of.
printed material (Tyszka
During the 1990s, a numberof direct-to-cylinder techniques
currently either under development or in the early stages of
commercializatiQn promise to decrease gravure cylinder preparation
time significantly. For example, a computer-to-cylinder system
that uses a laser to carve cells in a polymer coated gravure
cylinder has recently been'installed in a number of U.S. printing
plants. German companiesareleading in the development of
photopolymer cylindersfor gravure presses (Adams 1988; Bruno 1990;
SRI 1990).
Automation of rotogravure presses will" occurat a"slower rate
than for offset presses due primarily to the very large size of
rotogravure i presses However, widespread automation of cylinder
changeover and of "paper roll transport and r6ad"ihg has already
occurred. The introduction of fully automated presses controlled
by a single operator is expected by the late 1990s (Bruno 1990; SRI
1990) .
A number of other significant changesareanticipated in
rotogravure printing during the next few years. Special polymers
. • 2-100
-------
and other new materials will partially replace copper and steel in
cylinders thereby reducing weight and making higher press operating
speeds possible. Although gravure remains heavily dependent on
solvent-base inks, a growing amount of water-based and ultraviolet-
curable inks will be used; however, acceptable water-based
publication gravure inks have yet to be identified. Wider presses
will be introduced, allowing increased output (Bruno 1990; Jones
1993; SRI 1990).
4. Flexoqraphic Printing
Important improvements will occur in . both
flexographic plates and inks. The use of photopolymers in plate
manufacture will both lower the cost and improve the quality of
flexographic plates. Edge sharpness will improve approaching that
achieved with offset. Improvements in the density and consistency
of the water-based color inks used in f lexography are also expected
(SRI 1990) ..
A major problem 'in flexographic printing has been so-called
plate or image plugging. However, this problem will be largely
overcome as a result of improved wash-up devices and inking
systems. This will result in black-and-white halftone quality
approaching that achieved with offset printing (SRI 1990).
Continuing improvements in process color printing by
flexography will make the process increasingly competitive with
lithography in the medium-quality magazine market (Bruno 1990).
5. Plateless Printing
A variety of plateless technologies are currently in
use. These processes, expected to undergo continuing improvements
and refinements during the 1990s, .include: electronic printing;
ink-jet printing; thermal printing; ion deposition printing; and
magnetography. Anticipated market trends for these processes are
discussed below. The technologies themselves are described in
Section III.F.2 of this report.
Plateless technologies are currently important primarily in
the office, in-plant, and quick printing markets. They are also
important in direct mailing and personalized advertising. These
markets are expected to be the growth leaders in the printing
industry during the 1990s. As plateless technologies improve and
become widely available, a growing Share of the business that would
formerly have been done by small- to medium-size commercial
printers using traditional technologies will instead be done in the
office or at the quick printer (Bruno 1990; SRI 1990).
In 1990, plateless processes accounted for only about three
percent of the total value of the output of the U.S. printing
2-101 ' • "
-------
- tii
market. However, these processes' market share will grow
explosively in the next 35 years, accounting for 11 percent of the
market by the year 2000 and 21 percent by 2025 (Bruno 1990).
a.
Printing
Electronic printing is used primarily for
short-run office, in-plant, and quick printing. Quick printing is
eSectXto be one of the fastest growing segments of the printing
industry in the foreseeable future and its growth will be fueled in
part by the continuing increase in the quality and economy of
llectronic printing technologies (SRI 1990). For example, there
havfbeen d?amatic improvements in the quality of color copiers
ThISe copiers are soon expected to be competitive with traditional
printing methods in the short-run (500 to 10,000 copies) color
market (GATF 1992a).
Laser printers, connected to personal computers in both_the
office and home environments, will become widespread Currently
prices are falling and low-end laser printers are ayailable_for as
little as $600. More sophisticated printers capable of using the
Postscript page definition language are available for well under
$2,000 (SRI 1990)
Use of high dot-density color electrophotography machines with
dot densities ranging from 400 dots per inch (DPI) to 2000 DPI will
becoml more widSyuIed in the office, in-plant, and fast-services
The quality of the printed output will increase
" er s
s
1990s "but printing speed will continue to be very slow
when compared to other methods (SRI 1990) .
Another . growth area for electronic Dinting is in_ the
production of relatively inexpensive proof copies of Pnted
materials that will be printed using one of the tr
printing technologies (Adams 1988; Bruno 1990) .
'' •••'•$••• : '-., '°\':^\^'^
b. Ink- "iet Printing.
Continued technological improvements will
stimulate the increased use of ink- jet printers in the printing
£• "™SS1
use for this technology, however, is expected to remain in the
oflice°ren^ronLnt: jS-J.t printers '*
2-102
-------
the office environment for engineering graphics and other business
applications. Higher quality color ink-jet printers will be
developed in response to the growing amount of sophisticated
graphics software available for personal computers (SRI 1990).
c. Thermal Printing
Thermal printers will continue to enjoy a
limited increase in market share during the 1990s. This growth
will be stimulated by improvements in resolution, color capability,
and reduced paper cost. However, a number of drawbacks remain,
including the need for special papers, a low rate of output, and,.
despite improvements, comparatively poor image quality. Thermal
printing is currently used in facsimile machines and other office
applications (SRI 1990).
d.
Ion Deposition
Ion deposition printing, an emerging technology
similar to electronic printing and other electrostatic processes,
will show marked improvement during the mid-1990s. Currently, this
technology is used primarily in the office environment where it is
used to print forms, reports, and other business documents. One
area where this technology is expected to be applied in the 1990s
is in multiple-color printing. However, ion deposition printing
will require considerable development and refinement before it can
compete with laser printing (Bruno 1990; SRI 1990).
e..
Magne t ogr aiphv
Magnetography is similar to electronic printing
except that a magnetic, and not an electrostatic, photoconductor is
used. The use of magnetography is limited to a few specialty
printing markets such as printing identifier labels, bar codes,
pressure sensitive labels, and glossy substrates. No major
improvements in this technology are expected in the 1990s.
Furthermore, due to shortcomings such as slow speed, high toner
costs, and the inability to do color process printing little or no
market growth is anticipated (SRI 1990).
C.
Postpress Technology'
Until recently the automation of postpress operations has
been limited, and, for many printers, postpress operations remain
labor intensive. One source estimates that nearly 80 percent of
the cost of some print jobs is material handling. Because much of
the labor in postpress operations involves materials handling,
2-103
-------
there is the opportunity to decrease postpress costs substantially
through further automation .{Bruno 1990; SRI 1990) .
The major development in postpress technology, has been the
introduction of computer-controlled in-line finishing systems that •
directly link the press with postpress operations. In comparison
to off-line finishing, these in-line systems can typically finish
three to four times the number of units per hour with roughly half
the personnel (Adams 1988; SRI 1990).
In addition to traditional binding and finishing operations,
some in-line finishing' systems can perform a number of specialized
operations such as addressing and demographic binding. Demographic
binding refers to the selective assembly of a publication based on
any of several factors including geographic area/ family structure,
income, or interests. The technique can be used, for example, to
include advertisements only in those copies of a magazine that will
be received by persons in the advertisers selling area (Adams
1988). Selective binding techniques used to target printed
products to selected geographic areas and markets are widely used
today and have been proven1 to be very effective marketing _ tools „
The use of' this technology will continue to expand at a rapid rate
due, primarily, to the intense interest shown by advertising
agencies and other direct marketing organizations (Bruno 1990; SRI
1950). _ ' ' ^ "•; ;;°" '; ';•;; •
Water-based adhesives have long been used in printing
facilities operations. However, an important chemical trend in
postpress1 operations is the increasing use water-based adhesives in
place of solvent-based adhesives containing toluene and methyl
ethyl ketone;'" _ ' • '' •
During the 1990s, the introduction ofrobots for postpress
materials tracking and handling is anticipated (Bruno 1990).
! N'l
2-104
-------
APPENDIX A
SXC Major Group 27:
Printing, Publishing, and Allied Industries
-------
II I HI ,
-------
Major Group 27.—PRINTING, PUBLISHING, AND ALLIED
INDUSTRIES
The Major Group as a Whole
This major group includes establishments engaged in printing by one or more common
processes, such as letterpress; lithography (including offset), gravure, or screen; and those es-
tablishments which perform services for the printing trade, such as bookbinding and plate-
making. This major group also includes establishments engaged in publishing newspapers,
books, and periodicals, regardless of whether or not they do their own printing. News syndi-
cates are classified in Services, Industry 7383. Establishments primarily engaged in textile
printing and finishing fabrics are classified in Major Group 22, and those engaged in printing
and stamping on fabric articles are classified in Industry 2396. Establishments manufactur-
ing products that contain incidental printing, such as advertising or instructions, are classi-
fied according to the nature of the products—for example, as cartons, bags, plastics film, or
paper.
Induitiy
Group Industry
No. No.
271
NEWSPAPERS: PUBLISHING. OR PUBLISHING AND PRINTING
2711 Newspapers: Publishing, or Publishing and Printing
Establishments primarily engaged in publishing newspapers, or in publish-
ing and printing newspapers. These establishments carry on the various oper-
ations necessary for issuing newspapers, including the gathering of news and
the preparation of editorials and advertisements, but may or may not perform
their own printing. Commercial printing is frequently carried on by establish-
ments engaged in publishing and printing newspapers, but, even though the
. . commercial printing may be of major importance, such establishments are in-
cluded in this industry. Establishments not engaged in publishing newspapers,
but which print newspapers for publishers, are classified in Industry Group
275. News syndicates are classified in Services, Industry 7383.
272
Comnmcul printing and nempap*r
publishing combined
Job printing and nttnpapar publishing
pornhinad
Newapaptr branch office*, editorial and
advertising
Nempaperr publishing and printing,
or publishing only
PERIODICALS: PUBLISHING, OR PUBLISHING AND PRINTING
2721 Periodicals: Publishing, or Publishing and Printing
Establishments primarily engaged in publishing periodicals, or in publishing
and printing periodicals. These establishments carry on the various operations
necessary for issuing periodicals, but may or may not perform their own print-
ing. Establishments not engaged in publishing periodicals, but which print
periodicals for publishers, are classified in Industry Group 275.
Comic books: publishing and printing,
or publishing only
Magazines: publishing and printing, or
publishing only
Periodicals: publishing and printing, or
publishing only
Statistical reports (periodicals), publish-
ing and printing, or publishing only
Television schedules: publishing and
printing, or publishing only
Trade journals, publishing and print-
ing, or publishing only
A-l
-------
ladoatry
Greap
No.
273
Industry
No.
2731
BOOKS . •
Books: Publishing, or Publishing and Printing
Establishments primarily engaged in publishing, or in publishing and print-
ing, books and pamphlets. Establishments primarily engaged in printing or in
printing and binding (but not publishing) books and pamphlets are classified
in Industry 2732. ' ' ' '
2732
274
276
Book dub publkhing and printing, or
publiafainic only
Books: publishing and printinf. or pub-
tkhinf only
Marie books: publishing and printing,
or publkhing only
ParapblMc publishing and printinf, or
publishing only
Textbooks- publishing and printing, or
publishing only
Book Printing [ .'.•.'.,,'. ' , ,. . :, ',.,...'' ., , ,.
Establishments primarily engaged in printing, or in printing and binding,
books and pamphlets, but not engaged in publishing. Establishments primarily
engaged in publishing, or in publishing and printing, books and pamphlets are
classified in Industry 2731. Establishments engaged in both printing and bind-
ing books, but primarily binding books printed elsewhere, are classified in In-
dustry 2789.
Boob: prating or printinf and bind-
Jfif » not publishinf
Marie books: printinf or printing and
t pubusbinf
Panphists: printinf or, printfnf and
bindinf, not publiininf
Ttxtbook*: printinf or printinf and
bindinf. not publiininf
MISCELLANEOUS PUBLISHING
2741 Miscellaneous Publishing
Establishments primarily engaged in miscellaneous publishing activities,
not elsewhere classified, whether or not engaged in printing. Establishments
primarily engaged in offering fiyanein'l, credit, or other business ttervices, and
which may publish directories as part of this service, are classified in Division
I, Services. .
Atlawc publkhing and printing, or
publiihiBfonly
'
and prinnnf, or publimhing only
CaltBdan: publahing and printinf. or
publiahifif only •
Caulocc publkhing and printinf. or
publfcbinfonly
Dincteiwr publiihing and printinf. or
pubikhmfonly
Glob* conn (mapfl: publfehiaf and
printiair . or pubUifainf only
Guidac publkhing and printinf. Or
Marie, shott: publishinf and printinf.
or publkhing only
Patterns.'pspir, incliadinf clothinf pat-
tems: publkhing and printinf, or
publishing only
Rao* track programs: publishing and
printinf, or publishinf only
Racing forms: publishing and printinf,
or publishinf only
Shopping newt publishing and print-
ing, or publkhing only
Technical manual* and paptn: publish-
ing and printing, or publillhing only
Tclsphon* directories: publishinf and
Mips: publkhing and printinf. or pub- printing, or publkhing only
Ushinf only Yearbooks: publishinf and printinf, or
Mieropubushinf publishinf only
Multimedia oducational kits: publishing
and printinf, or publishinf only
COMMERCIAL PRINTING
2752 Commercial Printing, Lithographic
Establishments primarily engaged in printing by the lithographic process.
The greater partof the workin.this industry is performed on a job or custom
basis; but in some cases lithographed calendars, maps, posters, decalcomanias,
A-2
-------
Indurtry
Group
No.
275
Industry
No. '
COMMERCIAL PRINTING—Con.
2752 Commercial Printing, Lithographic—Con.
or other products are made for sale. Offset printing, photo-offset printing, and
photolithographing are also included in this industry. Establishments primari-
ly engaged in lithographing books and pamphlets, without publishing, are
classified in Industry 2732. Establishments primarily engaged in publishing or
printing greeting cards are classified in Industry 2771. Establishments primar-
ily engaged in preparing lithographic or offset plates and in related services
are classified in Industry 2796. Establishments primarily engaged in providing
photocopying services are classified in Services. Industry 7334.
Advertising poster*, lithographed
Atlases, lithographed
Billhead!, lithographed
Bread wrappers, lithographed
Business forms, except manifold: litho-
graphed
Calendar*, lithographed: not published
Card*, lithographed
Circular*, lithographed
Color card*, paint: offset printing
Color lithography
Coupon*, lithographed
Dacalminanin (dry tranafera), litho-
graphed
Faihion plate*, lithographed
Instant printing, except photocopy serv-
ice ' •
Label*, lithographed
Letter*, circular and form: lithographed
Lithographing on metal or paper
Map*, lithographed
Menu*, lithographed
Newspapers, lithographed: not pub-
2754
Periodic*]*, lithographed: not published
Photo-of&et printing
Photolithographing
Pianographing
Playing card*, lithographed
Postcard*, picture: lithographed
Poster*, lithographed
Printing from lithographic or offset
platea
Printing, commercial or job: lithograph-
ic and offset
Printing, lithographic
Quick printing, except photocopy serv-
ice
Schedule), transportation: lithographed
Stall, lithographed
Souvenir card*, lithographed
Tag*, lithographed
, Ticket*, lithographed
Trading (tamps, lithographed
Transferring design* (lithographing)
Transforfl, decalcomania and dry: litho-
graphed
^^ ' Visiting card*, lithographed
Onset printing • Wrapperu, lithographed
Commercial Printing, Gravure
Establishments primarily engaged in gravure printing. Establishments pri-
marily engaged in making and preparing plates for printing are classified in
Industry 2796. ,
Bread wrappi
cgr
Bniineai form*, except manifold: gra-
vure printing
Calendar*, gravure printing: not pub-
lishing
Card*, except greeting: gravure print-
• ing
Catalogs: gnvun printing (not publish-
ing)
Circular*: gravure printing
Color printing: gravure
Coupon*: gravure printing
Directories: gravure printing (not pub-
lishing)
Envelope*: gravure printing
Facsimile letter*: gravure printing
Faihion plate*: gravura printing
Gravure printing
iiu[ijintit»g* gravure
Intaglio printing
Labels: gravure printing
Letter*, circular and' form: gravure
printing
Magazine* gravure printing (not pub-
lishing)
Map* gravure printing (not publishing)
Menus: gravure printing
Music, oheet gravure printing (not pub-
lishing)
Newspaper*: gravure printing (not pub-
Periodical*: gravure printing (not pub-
lishing) ,
Photogravure printing
Playing cards: gravure printing
Postcard*, picture: gravure printing
Potters: gravure printing
Printing, commercial or job: gravure
Printing: gravure, photogravure, rotary
photogravure, and rotogravure
Rotary photogravure printing
Rotogravure printing
Scheduled, transportation: gravure
printing
Scale gravure printing
Souvenir card*: gravure printing
Stationary: gravura printing
Telephone diractoriee, gravure printing:
not publishing
Ticket*: gravure printing
Trading stamp*: gravure printing
Visiting cards: gravure printing
Wrappers: gravure printing
. A-3
-------
Wtacry
Croup
He.
275
Industry
COMMERCIAL PRINTING—Con.
2759 Commercial Printing, Not Elsewhere'Classified
Establishments primarily engaged in commercial or job printing, not else-
where classified. This industry includes general printing shops, not elsewhere
classified, as well as shops specializing in printing newspapers and periodicals
, for others.
Musk, sheet: except lithographed er
gravure (not publishing)
Newspaper*, printed: except litho-
graphed or gravure (not publishing)
Periodical*, printed: except litho-
graphed or gravure (not publishing)
Plstelea* engraving
Playing card*, printed: except litho-
graphed or gravure
Postcard*, picture: except lithographed
or gravure printed
Poster*, including billboard: except lith-
ographed or gravure
Printing from engrnved and etched
plate*
Printing, commercial or job: engraved
plat*
Printing, commercial or job: except lith-
ographic or gravure
Printing, flexographic
Printing, letterpress
Printing, screen: except on textile* er
finished fabric article*
Schedule*, transportation: except litbo-
i graphed or gravure
Screen printing on gUia. plastics.
paper, and metal, including highway
sign*
Seal*: printing except lithographic or
Announcement*, engraved
Bag*. rlr^***' printed only, except lith-
ographed or gravure (bags not msae
v in printing pl»ntii
Banknote*, engraved
Bread wrapper*, printed: except litho-
graphed or gravure
niiiinm form*, except manifold, litho-
graphed or gravure printed
Calendars, printed: except lithographed
orgravure
Garde, except greeting card* engraving
•of
Card*, printed: except greeting, litho-
graphed or gravure
Catalog!, printed: except lithographed
or gravure (not publishing)
Circular*, printed: except lithographed
or gravure ...... ....................
Color printing: except lithographed or
gravure
CtHipoci*! printed: except lithographed
,: or gravure
Currency , engraving of
ias. printed: except litho-
.
graphed or gravure
Directories. printed: except litho-
graphed or gravure (not publishing)
Envelope*, printed: except lithographed
or gravure
Fathioo plate*, printed: except litho-
graphed or gravure
Flexotraphic printing
Gummed label* and eeal*. printed:
except lithographed or gravure
Halftone*, engraved
Imprinting, except lithographed or gra-
vure
Invitation!, engraved
F shels, printed: except lithographed or
Letter
276
Security certificates, engraved
Souvenir card*: except lithographed or
giavure
Stationery: except lithographed or gra-
vure
Stock certificate*, engraved
Tags, printed: except lithographed or
Telephone directories, except litho-
graphed or gravure foot publishing)
Thermography. except lithographed or
gravure
Ticket*, printed: except lithographed or
gravure
Trading (tamps, printed: except litho-
graphed or gravure
Visiting card*, printed: except litho-
graphed or giavure
Wrapper*, printed: except lithographed
orgravure '
. iprinting
Letters, circular and form: except litho-
,,11 graphed or gravure printed
M*c*T*it*. printed: except litho-
graphed or gravure (not publishing)
Man*, engraved
Mips, printed: except lithographed or
"i*1 ' gravure (not publishing)
Menus, except lithographed or gravur*
"I"!! printed
MANIFOLD BUSINESS FORMS
2761 Manifold Business Forms
Establishments primarily engaged in designing and printing, by any process,
special forms for use in the operation of a business, in single and multiple
sets, including carbonized or interleaved with carbon or otherwise processed
for "multiple reproduction.
A-4
-------
Inductry
Croup
No.
276
luduttxy
No.
MANIFOLD BUSINESS FORMS—Con.
2761 Manifold Business Forms—Con.
FanfoU form*
Sales book*
Strip form* (manifold bi
ifoi
*i
Tabulating card eel form* ihiminei
form!)
Unit wta (manifold bniinie* formi
277
2771
Autographic register form*, printed
Butine** form*, manifold
• Computer forma, manifold or continu*
oui (exclude* paper (imply linedl
Contaauou* forma, office and buauww
carboniied or multiple reproduction
GREETING CARDS
Greeting Cards
Establishments primarily engaged in publishing, printing by any process, or
both, of greeting cards for all occasions. Establishments primarily engaged in
producing hand painted greeting cards are classified in Services, Industry
8999.
278
2782
Birthday card*, except hand painted
Chriitma* carda, except hand painted
Euter card*, except hand painted
Greeting carda, except hand painted
Valantiae carda, except hand painted
BLANKBOOKS, LOOSELEAF BINDERS, AND BOOKBINDING AND
RELATED WORK
Blankbooks, Looseleaf Binders and Devices
Establishments primarily engaged in manufacturing blankbooks, looeeleaf
devices, and library binders; and in ruling paper.
ACOOUflt IKHrfceT
Album*
Binder*, looeeleaf
Chart and graph paper, ruled
Checkbook!
Diane*
Inventory blinkbooki
Ledger* and ledger abeet* '
Library binder*, looeeleaf
Looerienf derieei end biadete
Lr9T*l*'f form* and filler*, pen ruled
or printed only
Memorandum baoka, printed
Paper ruling
PaMbook*
Receipt book*
Record albumi
Sample book*
Scrapboota
2789 Bookbinding and Related Work
Establishments primarily engaged in edition, trade, job, and library book-
binding. Also included in this industry are establishments primarily engaged
in book or paper bronzing, gilding, and edging; in map and sample mounting;
and in other services related to bookbinding. Establishments primarily bind-
ing books printed elsewhere are classified in this industry, but those primarily
binding books printed in the same establishment are classified'in Industry
Group 273.
Beveling of card*
Binding only: book*, pamphlet*, magi-
zinee,etc.
Book gilding, bronzing, edging, deck-
ling, einbcneini[. and gold Btamping
Bookbinding: edition, job, library, and
trade
Bronzing book*, card*, or paper
Display mounting
Edging book*, card*, or paper
MegatiTiBii binding only
Mounting of map* and atmple*. for the
trade
Pamphlet*, binding only
Paper bronzing, gilding, edging, and
deckling
Paper cutting, except die-cuttinj?
Rebiading book*, migerinte or pam-
phlete
Switches and (ample*, mounting for
. the trade
Trade binding gerriee*
A-5
-------
Qroup
No.
279
Intfaatrr
No.
SERVICE INDUSTRIES FOR THE PRINTING TRADE
2791 Typesetting
Establishments primarily engaged in typesetting for the trade, including ad-
vertisement typesetting.
Adtutiaanant miaaattlng
Cctnpommel, hud: for th* printing
'trad*
Ccopoauioo. machina: *.g, linotype
moootyp*—for tfa* printing tnd*
Phototypeietting
TjiUMIlini fin till |ii inline I mil
Tjpaaailing. cotnpnur cootrollad
2796
Platemaking and Related Serricea
Establishments primarily engaged in making plates for printing purposes
and in related services. Also included are establishments primarily engaged in
making positives or negatives from which offset lithographic plates are made.
These establishments do not print from the plates which they make, but pre-
pare them for use by others. Engraving for purposes other than printing is
classified in Industry 3479.
Color atpantMoa tor printing
Ekctnryp* plataa
Elactrotyping for th« tnd*
Embi»n« pUu» for printing
Eafnnnf oo copper, itxl. wood, or
rubb«f pUm for printing purpani
Eaficrinc oa (train printinc pUtM
udc^indm
Enfnrinc, «•«! line for printing pur-
Lttta
«t«.pnip«lr«tiooof
Etcning oa copper. itMl. wood, or
rubew pUtw for printing putpaM
Ftangnphie pUtM. prapumtiOD of
Gnran pi*U* and qrlindcn, prapin-
tianef
Uthognphie plate*. po*iti«n or n*ga-
tin*: prap*ntion of
OBnt pUu«, pontrm or Mgattvw:
pTVpHTKIOtt Of
Photnognrinffortfattmit
Plata* and eylindan, rotogcDTim print-
ing: prapuation of
Plata*, printiag: pnfuration of
Staraoqrp* plata*
Stano^ping for tba tnd*
I!
I ','
A-6
-------
APPENDIX B
Top 101 North American Commercial
and Publication Printers
-------
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APPENDIX C
Top 100 U.S. Screen Printers
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APPENDIX D
i ' • • .
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OO.S. GOVERNMENT PRINTING OFFICE: 1994-523-884/81373 •
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R-l
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R-2
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REFERENCES
(continued)
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Quick Printing. 1991. "Quick Printing Top 100:
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R-3
Slow Growth,
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Screen Printing. 1990.
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