Printing plate precursor and printing plate

摘要

Disclosed is a printing plate precursor comprising a comprising a substrate and provided thereon, a hydrophilic layer having a center line average roughness Ra of from 150 nm to less than 1000 nm and having effective protrusions of from 500 to less than 3000 per mm<2>, the effective protrusions protruding from an upper plane 1.0 mu m farther from the substrate than a center roughness plane in the three dimensional roughness plane of the hydrophilic layer, and having a ratio H/D of not less than 0.15, wherein H represents a height ( mu m) from the upper plane of the effective protrusions, and D represents a size ( mu m) of solids formed by the upper layer and the curved surface protruding from the upper plane of the effective protrusions.