Patent ID: 6868787
Filing Date: 2005-03-22
Classification: B41C,B41N

Abstract:
1. A printing plate precursor 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 μm farther from the substrate than a center roughness plane in a 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 (μm) from the upper plane of the effective protrusions, and D represents a size (μm) of solids formed by the upper plane and the curved surface protruding from the upper plane of the effective protrusions.