Patent ID: 7175971
Filing Date: 2007-02-13
Classification: B41C,G03F

Abstract:
1. An exposure processing method of a planographic printing plate comprising: (a) providing a structure of an image recording layer containing a polymerizable compound, a compound generating a polymerization initiator, and a compound absorbing image recording light, the image recording layer having an upper part, middle part and lower part, these three parts of the image recording layer having a uniform thickness in the depth direction; (b) manufacturing a planographic printing plate, by composing the image recording layer on a support body, with a light absorption coefficient distribution of the image recording layer in the depth direction from the surface adjusted so that the light energy quantity absorbed in the lower part of the image recording layer is more than the light energy quantity absorbed in the upper and middle parts of the image recording layer; (c) exposing, by emitting light onto the image recording layer of the planographic printing plate; and (d) heating the image recording layer of the exposed planographic printing plate.