Method of producing support for planographic printing plate.

摘要

A method of producing a support for a planographic printing plate, which reduces the scattering in the material of the aluminum support, improves the yield of the electrolytic surface graining treatment, and is able to produce lithographic printing plates having superior surface graining aptitude. Aluminum material with a width of 1000mm and a thickness of 6mm is formed in the continuous casting twin-roller thin plate device. It is then cold rolled to a plate thickness of 3mm, and after conducting annealing at 400 DEG C, cold rolling (including correction) is further conducted to bring it to 0.3mm and form the samples. The temperature distribution of the molten metal at the outlet of the molten metal supply nozzle is kept within a predetermined range.