GRAINED ALUMINIUM SUPPORT FOR A LITHOGRAPHIC PRINTING PLATE

摘要

A support for a lithographic plate comprising an aluminum plate or an aluminum-alloy plate the surface of which has been grained such that the grain structure comprises pits and; (i) the distribution of pit diameter is such that the pits corresponding to 5% and 95% on a cumulative frequency curve for pit diameter are about 3 mu or more and about 10+/-1 mu in diameter, respectively; and (ii) the center line average roughness (Ra) of said surface is on the range from about 0.6 to 1.0 mu . A light-sensitive material for preparing a lithographic plate is also disclosed.