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The problem can occur with most types of printing, and is avoided by the use of slipsheets between copies (so any ink transfer occurs onto discardable paper) or anti-set-off spray powder. The term in offset printing also refers to the unwanted transfer of ink to rollers and friction points throughout the printing press. Ink that is not properly ...
The diameter of the powder used is relative to the density (g/m 2) of the stock (paper or board) being printed. For 150 g/m 2 paper the ideal anti-set-off spray powder would be 15 μm in diameter, for 200 g/m 2 20 μm, through to 70 μm for heavy board (700 g/m 2). Most manufactures of spray powder offer both coated and uncoated powders.
The higher the speed of the press, the higher the set-off will be. Set-off is measured at two different time intervals, 0.35s and 3s. A freshly printed surface is pressed against a paper after 0.35s and after 3s. Then the set-off density is measured.
Lines per inch (LPI) is a measurement of printing resolution. A line consists of halftones that is built up by physical ink dots made by the printer device to create different tones. Specifically LPI is a measure of how close together the lines in a halftone grid are. The quality of printer device or screen determines how high the LPI will be.
Prepress is the term used in the printing and publishing industries for the processes and procedures that occur between the creation of a print layout and the final printing. The prepress process includes the preparation of artwork for press, media selection, proofing, quality control checks and the production of printing plates if required.
A printing press, in its classical form, is a standing mechanism, ranging from 5 to 7 feet (1.5 to 2.1 m) long, 3 feet (0.91 m) wide, and 7 feet (2.1 m) tall. [38] The small individual metal letters known as type would be set up by a compositor into the desired lines of text. [39]