PRINTING PLATE HAVING RADIATION-SENSITIVE RECORDING LAYER ON ROLL-TREATED AND STAMPED ALUMINUM SUPPORT, AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a radiation-sensitive printing plate free from such disadvantage of a known material as introduction of a matting agent into an additional matting layer or a radiation-sensitive layer, by tightly fixing the radiation- sensitive layer in a support material for more print runs than 150,000 prints and having a fine surface structure of a limited roughness in the support. SOLUTION: The radiation-sensitive printing plate comprises a roll-treated and stamped aluminum plate. The surface of the aluminum plate has a rough pit structure. A fine recess structure formed by electrochemically roughing is superposed on the rough pit structure. Each recess has a diameter of 0.1 to 5μm. A mean roughness of the surface Ra of the stamped aluminum support is in a range of 0.63 to 0.83μm.