Printing Knowledge
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Ink Film Thickness 2013-10-20
The thickness of the ink film on the rollers is a very important consideration in printing. Typical ink film thickness on a lithographic press is 0.2~0.4 mils (0.0002~0.0004 in., or 0.005~0.010 mm), depending on the ink color and printing sequence. T…
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Design Principles of Inking Systems 2013-10-19
A few important design principles are built into the inking system. Each of these helps to optimize the efficiency of the inking system for depositing an even film of ink across the entire plate image.Length of ink train. The number of rollers and th…
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Inking Systems for Waterless Lithography 2013-10-18
Waterless lithography requires a printing press that is equipped with a temperature control system, Figure 3-8. Two types of press temperature control systems are used: an ink oscillator cooling system and a plate cylinder cooling system. With the in…
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The Typical Inking System 2013-10-17
The inking system, or inker, of most large sheetfed presses in Figure 3-7 usually has at least ten rollers and consists of the following parts: . Ink fountain - a pan that contains the ink supply.. Ductor or ductor roller - a transfer roller that alt…
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Inking System Functions 2013-10-16
The inking system of an offset press serves five important functions: (1) ink milling, (2) varying ink input across the system, (3) storing ink for consistent ink film thickness, (4) dampening control, and (5) keeping the plate clean. Ink milling. Th…
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Small Offset Presses 2013-10-15
Generally, any press smaller than 11 x 17in. (279 x 432mm) without bearers (hardened metal tings attached to the ends of the cylinder or to the cylinder's journal) is called a small offset press or, more often, a duplicator, Figure 3-6. Duplicators …
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Perfecting Press 2013-10-14
Most sheetfed presses can print on side of the sheet in a single pass. For the other side to be printed, the entire paper pile must be turned over and the paper run through the press a second time. There is, however, a type of sheetfed press that can…
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Multicolor Press 2013-10-13
A press consisting of several printing units (each with its own inking and dampening system), a feeder, a sheet transfer system, and a delivery is called a multicolor, or multiunit press. A multicolor press can have two, four, five, six, or more prin…
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Printing Auxiliary Equipment 2013-10-12
Auxiliary equipment for a sheetfed press is composed of those devices that perform specialized operational functions. These devices can significantly improve print quality and increase productivity. The following auxiliary equipment may be found on a…
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Direct-Imaging Presses 2013-10-11
A printing press that uses a laser system to image plates directly on the plate cylinder is referred to as direct-imaging press. The first printing press with on-press platemaking capabilities was introduced in 1991. This two-up press was Heidelberg …
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Cylinder Arrangements 2013-10-10
Although the three-cylinder arrangement is the most common for sheetfed presses a number of other cylinder arrangements may also be encountered. Following is a brief overview of six possible cylinder arrangements (Figure 3-2): . Two-cylinder. A speci…
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Single-Color Press 2013-10-09
A press consisting of a single printing unit, with its integral inking and dampening systems, a feeder, a sheet transfer system, and a delivery is called a single-color press (Figure 3-1). Normally, it can print only a single color in any one pass th…
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Press Configurations - Sheetfed Press 2013-10-08
A variety of sheetfed printing presses are available. These presses can best be classified according to their offset press cylinder configurations (arrangements), although the placement of the feeder and delivery are also important considerations in …
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Basic Systems of Sheetfed Offset Presses 2013-10-07
A sheetfed press consists of a feeder, one or more printing units, a sheet register system including transfer devices to move the paper through the press, a delivery, and various auxiliary devices (such as a control console). The printing unit of a s…
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Lithographic Plate Composition 2013-10-06
A conventional lithographic plate consists of two distinct surface areas. The image areas are oleophilic, meaning that the surface will readily attract oily ink. Nonimage areas are hydrophilic, or water attracting. Because oil-based ink and water ten…
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Types of Lithographic Plates 2013-10-05
A conventional lithographic plate consists of two distinct surface areas. The image areas are oleophilic, meaning that the surface will readily attract oily ink. Nonimage areas are hydrophilic, or water attracting. Because oil-based ink and water ten…
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Introduction to Lithographic Plates 2013-10-04
There are a variety of plates used in lithography. Each type of plates may have characteristics that make it suitable for a given type of press or type of production workflow. Even so, any plate used in lithography falls into one of two general categ…
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Job Planning, Machine Proofing, Digital Proofing 2013-10-03
Job Planning Communication is conveying a message from one person or group to another. The content of this book deals with the use of printed images to convey these messages. Printing is the primary vehicle for communicating graphically. Messages are…
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Computer-to-Plate Technology--the Focal Point of Development in Printing Technology 2013-10-01
a. The new trend of development in prepress industry 1. Conventional plate production featured by imagesetter, film and PS plate will not be able to keep its teading position in prepress industry in the twenty first century at present, the sales turn…
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Digital Workflow Would Become the Mainstream of Development in Printing 2013-09-30
a. Speedy development of digital processing and internet information exchange
All-digital workflows are on their way. They will soon replace the traditional analogue imaging and desktop processing system. With all-digital workflows, you would experie…