Method of manufacturing lithographic printing plate support

Abstract

Disclosed is a method of manufacturing a lithographic printing plate support, including a step of subjecting an aluminum plate to at least: a mechanical graining treatment using a brush and a slurry containing an abrasive to carry out mechanical graining such that the average surface roughness Ra is 0.25 μm or more but less than 0.40 μm, and an electrochemical graining treatment for carrying out electrochemical graining in an aqueous solution containing hydrochloric acid such that the average surface roughness Ra is 0.40 to 0.55 μm, with the treatments being performed in this order, so as to obtain a lithographic printing plate support. By this method, a lithographic printing plate support which can be used for a presensitized plate of high sensitivity which has both an excellent scumming resistance and a good press life when made into a lithographic printing plate is obtained.

Dependencies are inferred from the claim text.