Process for producing printing plates

Details Process for producing printing plates Process for producing printing plates

1973-04-04

1976-06-29

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 83, G03F 702, G03C 190

Patent

active

039664724

ABSTRACT:
A printing plate having halftones and lines is produced by exposing a photosensitive printing plate material comprising a support having an oleophilic surface, a hydrophilic layer formed thereon and a layer of a direct positive-type photosensitive silver halide emulsion formed on top of the hydrophilic layer through a positive original, developing the exposed material to form a silver image in the emulsion layer, subjecting the developed material to an etch bleaching treatment to remove the hydrophilic layer at portions corresponding to the silver image and to reveal the oleophilic surface, and removing the emulsion layer at a portion on which the silver image is not formed, thereby to reveal said hydrophilic layer. The printing plate can given a number of good quality impressions from the outset of printing, and smeared impressions do not result during continued printing operation.

REFERENCES:
patent: 2458403 (1949-01-01), Nadeau et al.
patent: 2462151 (1949-02-01), Woodward
patent: 2494053 (1950-01-01), Mitson et al.
patent: 3053658 (1962-09-01), Spencer
patent: 3300306 (1967-01-01), Sevens et al.
patent: 3625687 (1971-12-01), Dankle
patent: 3658524 (1972-04-01), Piesach
Woodward et al., Def. Pub. Search Copy of S.N. 849,648, filed 8/13/69, Def. Pub. No. T870,005.
Hartsuch, P. J. Chemistry of Lithography, 1961, Lithographic Technical Foundation, N.Y., pp. 105 & 106.
Tory, B. E. Photolithography, 1953, Graphic Arts Monthly, Chicago, Ill., pp. 182 & 183.

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