Method for manufacturing lithographic printing plates

Details Method for manufacturing lithographic printing plates Method for manufacturing lithographic printing plates

1989-06-14

1991-03-26

Brammer, Jack P.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

354324, 430309, 430310, 430331, G03F 700

Patent

active

050028570

ABSTRACT:
A method for manufacturing lithographic printing plates which comprises developing a presensitized plate for use in making lithographic printing plates imagewise opposed to light with an alkaline developer utilizing an automatic developing machine and then treating the developed presensitized plate with a finisher, wherein an initial pH of the finisher ranges from 2 to 8 and a pH of the finisher is controlled during running in proportion to concentration of the developer included in the finisher. The method makes it possible to prevent the formation of gel-like insoluble matters in the bath for treatment with the finisher due to the presence of the developer carried over from a developing bath and to stably process a large amount of lithographic printing plates over a long time period.

REFERENCES:
patent: 4291117 (1981-09-01), Ohishi
patent: 4840875 (1989-06-01), Kunichika et al.

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