| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a supporting body for a negative type photo polymerizing lithographic printing plate wherein a firm adhesion force between a photo-sensitive layer and the supporting body is realized, and fine lines and highlight are not blurred, and which is excellent in printing durability, and in addition, of which the anode oxide film of a wide area can be stably produced at a low cost, and its manufacturing method. SOLUTION: When an anode oxide film is formed by anode-oxidizing a surface-roughened aluminum sheet, as a treating liquid, a sulfic acid solution of which the concentration is 200-500 g/l is used, for the manufacturing method of a supporting body for a negative type lithographic printing plate, wherein a photo polymerization composition is used, and a direct plate making is possible, and in such a manufacturing method or in the supporting body for a negative type lithographic printing plate having an anode oxidization on a surface-roughened aluminum sheet, the bore diameter when a micro-bore existing in the anode oxide film is seen from the surface, is 10-20 nm, and also, an interval between average bores, is 10-30 nm, and the purpose is achieved by such a supporting body for a negative type lithographic printing plate.</p> |
