KEY ORIGINAL PLATE FOR PLANOGRAPHIC PRINTING PLATE, CUMULATIVE BODY OF KEY ORIGINAL PLATES FOR PLANOGRAPHIC PRINTING PLATE, AND PLATEMAKING METHOD OF KEY PLATE FOR PLANOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a key original plate for planographic printing plates which is excellent in retainability of a matting agent, flaw resistance, bonding preventability of key original plates for planographic printing plates, and setter transferability, has a good color sensor suitability and leaves less color after development, to provide a cumulative body of key original plates for planographic printing plates, and to provide a platemaking method of a key plate for planographic printing plates using the key original plate for planographic printing plates.;SOLUTION: The key original plate for planographic printing plates has a non-photosensitive layer and a hydrophilic layer which includes the matting agent in this sequence on an aluminum support. Two or more of the key original plates for planographic printing plates are directly stacked without via an interleaving paper into the cumulative body of key original plates for planographic printing plates. The platemaking method of the key plate for planographic printing plates includes: a key original plate preparation step in which the key original plate for planographic printing plates is prepared; and a development step in which the key original plate for planographic printing plates is passed through a development step by an alkali development liquid to be a key plate for planographic printing plates.;COPYRIGHT: (C)2012,JPO&INPIT