On-press development type planographic printing plate precursor, method of manufacturing planographic printing plate, and printing method

Abstract

An object of the present invention is to provide an on-press development type planographic printing plate precursor having excellent printing durability, a method of preparing a planographic printing plate, and a printing method. The on-press development type planographic printing plate precursor of the present invention is an on-press development type planographic printing plate precursor including a support; and an image recording layer, in which the support has an aluminum plate and an anodized film disposed on the aluminum plate, the anodized film has a plurality of micropores extending in a depth direction from a surface on a side of the image recording layer, the micropores have large-diameter pore portions extending from the surface of the anodized film to a position at a depth of 0.05 to 0.50 μm and small-diameter pore portions communicating with bottom portions of the large-diameter pore portions and extending in the depth direction from communication positions, an average diameter of the large-diameter pore portions on the surface of the anodized film is 0.015 to 0.070 μm, and an average value of Si atomic amounts calculated in a case where a circular region having a diameter of 30 mm on the surface of the anodized film on the side of the image recording layer is measured by X-ray fluorescence analysis is 0.008 to 0.14 mg.

Dependencies are inferred from the claim text.