Support for planographic printing plate and planographic printing plate material

Abstract

An object of the invention is to provide a planographic printing plate material exhibiting excellent dot reproduction and printing durability and a support for the planographic printing plate material. Disclosed is a support for a planographic printing plate material having a surface roughened via electrolytic surface-roughening treatment and anodization treatment conducted to one surface of an aluminum plate, wherein a) average surface roughness (Ra) of the roughened surface is 0.30-0.55 μm, and b) the roughened surface possesses a surface profile in which a ratio of Xa/Xb is 0.40-0.70, where Xa is the width expanding to the shallow region side and Xb is the width expanding to the deep region side at the position reaching peak depth in amplitude frequency.

Dependencies are inferred from the claim text.