Support for lithographic printing plate and presensitized plate

摘要

Disclosed is a support for a lithographic printing plate which, when measured over a 400 µm x 400 µm surface region thereon using a three-dimensional non-contact roughness tester, has at most 5.0 convex portions of a height from centerline of at least 0.70 µm and an equivalent circle diameter of at least 20 µm, and has at least 800 concave portions of a depth from centerline of at least 0.50 µm and an equivalent circle diameter of at least 2.0 µm. Presensitized plates which are obtainable by using the support for a lithographic printing plate according to the present invention have an excellent scumming resistance and an extremely long press life.