ORIGINAL PLATE OF PLANOGRAPHIC PRINTING PLATE AND MANUFACTURE OF PRINTING PLATE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain an original plate of a planographic printing plate that enables a novel plate making method with which an image can be formed by irradiation with light in the offset printing field. SOLUTION: A petaloid alumina layer, a titanium dioxide layer and a coating of a polysiloxane containing silicon atoms to which organic groups bond are successively disposed on a glass, ceramic or metallic substrate to obtain the objective original plate of a planographic printing plate. The original plate is imagewise irradiated with an active light, high density energy light or radiation for manufacturing the objective printing plate.