Patent ID: 6596150
Filing Date: 2003-07-22
Classification: B41N,C23F,C23G,C25F

Abstract:
A method for producing an aluminum support for a lithographic printing plate, comprising subjecting an aluminum plate to surface graining and then to mechanical polishing, wherein the surface graining is electrochemical surface graining using a direct or alternating current in an aqueous nitric acid solution, the aluminum plate being subjected to a preliminary surface graining treatment for generating fine irregularities before the electrochemical surface graining, andwherein the preliminary surface graining treatment comprises:(i) preliminary electrochemical surface graining of from 1 to 300 C/dm2 using an alternating current in an aqueous solution mainly comprising hydrochloric acid, and (ii) chemical etching of from 0.1 to 1.0 g/m2 in an aqueous alkali solution.