Densitometry - Offset Print Quality Control10-23-2013
Densitometry, colorimetry, and spectrophotometry are the three methods used to measure color in the graphic arts. The densitometer measures optical density. It…Read More
Dampening Solution Ingredients10-22-2013
Dampening solutions are usually sold as concentrated solutions that are diluted with water to the proper concentration. In concentrated from, it is commonly ref…Read More
Basic Functions of Dampening Solution10-21-2013
The primary function of solution is to desensitize the nonimage areas of the printing plate to ink. A surface that is "desensitized to ink" is a surface that in…Read More
Ink Film Thickness10-20-2013
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 (…Read More
Design Principles of Inking Systems10-19-2013
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 f…Read More
Inking Systems for Waterless Lithography10-18-2013
Waterless lithography requires a printing press that is equipped with a temperature control system, Figure 3-8. Two types of press temperature control systems a…Read More
The Typical Inking System10-17-2013
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:
Inking System Functions10-16-2013
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 i…Read More
Small Offset Presses10-15-2013
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 journ…Read More
Perfecting Press10-14-2013
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…Read More
Multicolor Press10-13-2013
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 mult…Read More
Printing Auxiliary Equipment10-12-2013
Auxiliary equipment for a sheetfed press is composed of those devices that perform specialized operational functions. These devices can significantly improve pr…Read More
Direct-Imaging Presses10-11-2013
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 o…Read More
Cylinder Arrangements10-10-2013
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…Read More
Single-Color Press10-09-2013
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 sing…Read More
Press Configurations10-08-2013
A variety of sheetfed printing presses are available. These presses can best be classified according to their offset press cylinder configurations (arrangements…Read More
Basic Systems of Sheetfed Offset Presses10-07-2013
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 del…Read More
Lithographic Plate Composition10-06-2013
A conventional lithographic plate consists of two distinct surface areas. The image areas are oleophilic, meaning that the surface will readily attract oily ink…Read More
Types of Lithographic Plates10-05-2013
Contact plates. A high percentage of today's commercial printing plates are made photographically using either negative or positive film. These plates are coate…Read More
Introduction to Lithographic Plates10-04-2013
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 produ…Read More