SUPPORT FOR PLANOGRAPHIC PLATE, PRODUCTION THEREOF AND PHOTOSENSITIVE PLANOGRAPHIC PRINTING PLATE

摘要

PURPOSE: To obtain a support for a planographic printing plate reconciled in both of the hardness to contaminate and printing durability of a non-image line part and good in tone reproducibility and to provide a photosensitive planographic printing plate. CONSTITUTION: In a support for a planographic printing plate obtained from an aluminum plate to which surface roughening treatment and anodic oxidation treatment are applied, recessed parts with a length of 30-50μm and a width of 5-15μm are provided to the roughened surface of the support at an interval of 100-200μm in a number of 2.5×10<3> -10×10<3> /cm<2> .