Patent ID: 6436596
Filing Date: 2002-08-20
Classification: B41C,G03F,Y10S

Abstract:
A quality control method for a planographic printing plate having disposed on a substrate a photosensitive layer formed by a resin soluble in an aqueous alkali solution and a compound that absorbs light to generate heat, the quality control method comprising the steps of:(A) exposing, to an ultraviolet ray, a gray scale for evaluating a positive type planographic printing plate made by exposure to an ultraviolet ray, followed by development with a standard developing solution having a standard formula, and measurement of the sensitivity of the gray scale processed by the standard developing solution; (B) exposing, to an ultraviolet ray, a gray scale for evaluating a positive type planographic printing plate made by exposure to an ultraviolet ray in the same manner as in the step (A), followed by development with a developing solution to be evaluated, and measurement of the sensitivity of the gray scale processed by the developing solution to be evaluated; (C) comparing the sensitivity of the gray scale processed by the developing solution to be evaluated with the sensitivity of the gray scale processed by the standard developing solution; and (D) reducing the exposure by 30% to 50% when the sensitivity of the gray scale processed by the developing solution to be evaluated is increased by a 0.5 level greater than the sensitivity of the gray scale processed by the standard developing solution.