Producing a lithographic printing plate by sequentially exposing

Details Producing a lithographic printing plate by sequentially exposing Producing a lithographic printing plate by sequentially exposing

1997-03-06

1999-08-03

Codd, Bernard

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430 30, 430348, 430394, 430494, 430944, 430945, G03C 500

Patent

active

059323949

ABSTRACT:
A method for generating on a lithographic printing plate a screened reproduction of a contone image, comprising the steps of: (1) transporting a thermo-sensitive imaging element through an exposure area; (2) scanwise exposing the thermo-sensitive imaging element according to screened data representative for tones of a contone image with a set (s) of radiation beams (b) as the thermo-sensitive imaging element is transported through the exposure area, characterized in that at any given moment (ta+.DELTA.t) during the exposure at least two radiation beams (bi,bj) of the set of radiation beams impinge on different microdots (ma, ma+.DELTA.m) of a scanline (1a) on the imaging element, so that by completion of the exposure step each effective microdot of the scanline has been impinged by all effective radiation beams of the set.

REFERENCES:
patent: 4383261 (1983-05-01), Goldberg
patent: 5804355 (1998-09-01), Bosschaerts et al.

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