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Digital printing has a higher cost per page than more traditional offset printing methods, but this price is usually offset by avoiding the cost of all the technical steps required to make printing plates. It also allows for on-demand printing, short turnaround time, and even a modification of the image (variable data) used for each impression. [2]
After the plate is cleaned of ink, the parts of the plate that received the blast can be seen to have minute pits that hold ink; the areas that were protected by the white litho ink remain smooth and are wiped clean before printing. [18] Contact paper and tape are also used on the plates as a sandblasting resist; those materials create imagery ...
To make a print, the engraved plate is inked all over, then the ink is wiped off the surface, leaving ink only in the engraved lines. The plate is then put through a high-pressure printing press together with a sheet of paper (often moistened to soften it). The paper picks up the ink from the engraved lines, making a print.
Collagraphy (sometimes spelled collography) is a printmaking process in which materials are glued or sealed to a rigid substrate (such as paperboard or wood) to create a plate. [1] Once inked, the plate becomes a tool for imprinting the design onto paper or another medium. The resulting print is termed a collagraph.
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This printing plate is mounted onto the plate cylinder within the printing unit which again is part of the printing tower. Modern presses can print full color on every page. Four color printing units are used for printing on one side of the paper web and another four printing units apply the backside print onto the paper web.
Viscosity printing is a multi-color printmaking technique that incorporates principles of relief printing and intaglio printing. It was pioneered by Stanley William Hayter . The process uses the principle of viscosity to print multiple colors of ink from a single plate, rather than relying upon multiple plates for color separation .