Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Patent
1989-03-28
1990-11-06
Dees, Jose
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
430331, 1014631, 101466, G03F 700
Patent
active
049685848
ABSTRACT:
A method for making lithographic printing plates which comprises imagewise exposing a presensitized plate for use in making lithographic printing plates to light, then developing and thereafter subjecting the developed plate to burning-in pretreatment, the method characterized in that the burning-in pretreatment is performed after applying, to the developed plate, an aqueous solution containing at least one organic solvent whose solubility in water at 25.degree. C. is not less than 0.5% by weight and whose surface tension measured on 0.5% by weight distilled water solution at 25.degree. C. is not more than 65 dyn/cm. The method can provide lithographic printing plates free of greasing, ink spreading on half-dot image portions, in particular shadow portions and excellent in ink receptivity of image areas. In addition, the method can be automated by making use of a spray-circulation type processing apparatus.
REFERENCES:
patent: 4063507 (1977-12-01), Toyama et al.
patent: 4191570 (1980-03-01), Herting et al.
patent: 4294910 (1981-10-01), Wielinga
patent: 4762771 (1988-08-01), Matsumoto et al.
patent: 4786581 (1988-11-01), Stahlhofen et al.
Matsumoto Hiroshi
Nagashima Akira
Dees Jose
Fuji Photo Film Co. , Ltd.
Weddington J.
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