ORIGINAL PLATE FOR DIRECT DRAWING TYPE WATERLESS LITHOGRAPHIC PRINTING PLATE AND DIRECT DRAWING TYPE WATERLESS LITHOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a direct drawing type waterless lithographic printing plate with good image reproducibility and good adhesive properties with a base sheet and in which a dot area ratio of the printing plate can be measured by a reflective densitometer.;SOLUTION: The original plate for the direct drawing type waterless lithographic printing plate which has at least a heat-sensitive layer and an ink repellent layer in this order on an aluminum base, is characterized by a mean surface roughness of the base being at most 4 μm and a width of change in the angle to the aluminum base being at most 0.08 when it is measured by the reflective densitometer.;COPYRIGHT: (C)2003,JPO