Lithographic printing process

Details Lithographic printing process Lithographic printing process

1974-10-02

1977-03-08

Weston, Caleb

Gas separation: apparatus

Solid sorbent apparatus

With programmed, cyclic, or time responsive control means

96 31, 96 45, 101450, B41M 118

Patent

active

040110850

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 contrasting 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.

REFERENCES:
patent: 547780 (1895-10-01), Gast
patent: 744223 (1903-11-01), Ortmann
patent: 809157 (1906-01-01), Weyl
patent: 3345176 (1967-10-01), Erikson et al.
patent: 3581660 (1971-06-01), Rapoport et al.
patent: 3655381 (1972-04-01), Roemer
The Lithographers Manual, 4th Edition, The Graphic Arts Technical Foundation, pp. 5:58-6:1 & 6:16.
The Handbook of Modern Halftone Photographs, Nov. 1965, pp. 100-101.

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