| 摘要 |
PROBLEM TO BE SOLVED: To provide a producing method of a supporting body of a lithographic printing plate capable of obtaining uniform quality of the product and decrease the production cost to min. SOLUTION: An aluminum plate or aluminum alloy plate is carried by rollers under the pressure of >=50 g/cm<2> and <=2000 g/cm<2> to perform mechanical roughening treatment to obtain 0.3 to 1μm average surface roughness. Then the plate is subjected to electrochemical roughening treatment while carried by rollers under the pressure of >=220 g/cm<2> and <=2000 g/cm<2> . The plate is further carried by rollers under the pressure of >=50 g/cm<2> and <=2000 g/cm<2> and subjected to anodically oxidation to form an anodic oxidation film. After that, the plate is carried by rollers under the pressure of >=10 g/cm<2> and <=900 g/cm<2> and a photosensitive layer is applied thereon. |
