Title:
LITHOGRAPHIC PRINTING PLATE AND PLATE MAKING METHOD
Document Type and Number:
Japanese Patent JP3480663
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve wash-off property in a washing process and to obtain excellent ink receptivity and water holding property by controlling the whole calcium ton content to a specified amt. or smaller in the all structural layers which constitute a lithographic printing plate.
SOLUTION: This aluminum lithographic printing plate is produced by applying a physical developing nuclear layer on an aluminum base body which is preliminarily roughened and anodically oxidized, and then applying a silver hallde emulsion layer thereon. A gelatin is generally used as a protective colloid in the silver halide emulsion layer. Also a gelatin can be used for other structural layers. A gelatin subjected to desalting treatment is preferably used for the silver halide emulsion layer or other structural layers. Especially, a gelatin having <1000 ppm calcium ion content is used. Preferably, a gelatin with <500 ppm calcium ion content, and more preferably <300 ppm content is used.
Inventors:
Genzo Yamano
Kunihiro Nakagawa
Etsuji Tanaka
Toshiro Kondo
Kunihiro Nakagawa
Etsuji Tanaka
Toshiro Kondo
Application Number:
JP23931297A
Publication Date:
December 22, 2003
Filing Date:
September 04, 1997
Export Citation:
Assignee:
Mitsubishi Paper Mills Co., Ltd.
International Classes:
B41C1/10; B41N1/14; G03C8/06; G03F7/00; G03F7/07; G03F7/32; (IPC1-7): G03F7/07; G03C8/06; G03F7/32
Domestic Patent References:
| JP922101A | ||||
| JP829969A | ||||
| JP6299752A |