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Title:
ORIGINAL PLATE FOR LITHOGRAPHIC PRINTING PLATE, METHOD FOR MAKING PRINTING LITHOGRAPHIC PRINTING PLATE EMPLOYING THE SAME AND PRINTING METHOD
Document Type and Number:
Japanese Patent JP2001162964
Kind Code:
A
Abstract:

To provide an original plate for lithographic printing plate, which will not necessitate any developing operation after image exposure or heating and capable of obtaining a lithographic printing plate, comprehensively prominent in the contamination of a non-printing area, a sensitivity and an image durability, through a simple treatment, and the preparing method as well as the printing method of the lithographic printing plate employing the original plate.

(1) The original plate for a lithographic printing plate comprises a phase change layer A, changing from hydrophilic nature into lipophilic nature by heating, and another phase change layer B, changing from the lipophilic nature into the hydrophilic nature through hydrophilic nature providing treatment, which are laminated sequentially on a substrate. (2) In such an original plate, the phase change layer A and/or the phase change layer B contains a substance, generating heat by absorbing light. (3) In this case, the thickness of the phase change layer B is 0.5-3.0 g/m2. (4) A method for preparing the lithographic printing plate comprises the steps or an image describing on the original plate of lithographic printing plate through a thermal head or laser exposure and, thereafter, applying the hydrophilic nature providing treatment on the surface of the original plate of the lithographic printing plate.


Inventors:
HIRAOKA SABURO
Application Number:
JP34864499A
Publication Date:
June 19, 2001
Filing Date:
December 08, 1999
Export Citation:
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Assignee:
KONISHIROKU PHOTO IND
International Classes:
G03F7/00; B41N1/14; (IPC1-7): B41N1/14; G03F7/00