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Title:
METHOD FOR QUALITY CONTROL OF LITHOGRAPHIC PRINTING PLATE
Document Type and Number:
Japanese Patent JP2002062663
Kind Code:
A
Abstract:

To provide a method for quality control such that the state for plate making conditions of a positive image forming material for IR laser beam for direct plate making is easily judged and that feedback is given from the result to the developing process to keep constant quality of the lithographic printing plate.

The method for quality control of a lithographic printing plate having a photosensitive layer containing a resin soluble with an alkali aqueous solution and a photo-thermal converting agent on a supporting body includes the following processes. The processes are (A) a process of preparing a standard alkali developer and determining the activity of the alkali developer based on a specified index, (B) a process of measuring the activity of the alkali developer to be evaluated according to the index same as above described, and (C) a process of comparing the activity of the alkali developer to be evaluated to that of the standard alkali developer and then controlling the value selected from the conductivity of the alkali developer, product of the conductivity and temperature or product of conductivity and developing time according to the difference in the activity if the difference in the activity exceeds a specified value.


Inventors:
AONO KOICHIRO
KAWACHI IKUO
OKUNO TAKASHI
Application Number:
JP2000245481A
Publication Date:
February 28, 2002
Filing Date:
August 14, 2000
Export Citation:
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Assignee:
FUJI PHOTO FILM CO LTD
International Classes:
G03F7/26; G03F7/00; G03F7/30; G03F7/32; G03G13/26; G03G13/28; B41C1/10; (IPC1-7): G03F7/26; G03F7/00; G03F7/32
Attorney, Agent or Firm:
Atsushi Nakajima (3 outside)