METHOD FOR MANUFACTURING ALUMINUM SUPPORT FOR LITHOGRAPHIC PRINTING PLATE MATERIAL, ALUMINUM SUPPORT FOR LITHOGRAPHIC PRINTING PLATE MATERIAL, LITHOGRAPHIC PRINTING PLATE MATERIAL, AND METHOD FOR IMAGE FORMATION

摘要

This invention provides a method for manufacturing an aluminum support for a lithographic printing plate material that, even when the speed of electrochemical surface roughening treatment by web transfer, the electrochemical surface roughening treatment plate width of an aluminum plate, and the current density have been change, can realize an identical surface roughened shape and is small in unevenness in manufacture. There are also provided an aluminum support for a lithographic printing plate material, having excellent printing durability, stain resistance and tone reproduction, a lithographic printing plate material, and a method for image formation. The method for manufacturing an aluminum support for a lithographic printing plate material is characterized in that the electrode construction of a treatment tank for electrochemical surface roughening treatment is such that the number of electrodes (1φ) using a three-phase power supply is at least 3 to 5, the time necessary for passage by web transfer through between the electrodes is 0.15 to 0.60 sec, and the ratio between the time necessary for passage through directly under the electrodes and the time necessary for passage through between the electrodes (directly under the electrodes/between the electrodes) is 1.5 to 3.5.