Lithographic plate making and printing process

Details Lithographic plate making and printing process Lithographic plate making and printing process

1977-02-16

1979-04-17

Coughenour, Clyde I.

Printing

Planographic

Processes of lithographic printing

96 33, 96 45, 96116, 101211, B41M 118, G03F 512, G03F 522, G03F 702

Patent

active

041494644

ABSTRACT:
An improved two printing step process for reproducing visual subject matter including the making of a secondary printing plate with a positive image random pattern screen and printing a substrate sequentially and in registry with the secondary printing plate and a master printing plate made with a conventional half tone screen. The random pattern screen is a positive image phototransparency having a large plurality of irregularly shaped highlight areas and constrasting shadow areas per square inch, an optical density from about 0.17 to about 1.6, a contrast factor from about 0.75 to about 1.5 and a transparency factor from about 0.25 to about 0.60. The random pattern screen is made from a transparent plate having light disruptive projections on its surface. A negative and a positive phototransparency of the transparent plate are made while controlling exposure and developing conditions to produce a positive image screen having the desired characteristics.

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patent: 3581660 (1971-06-01), Rapoport et al.
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