ORIGINAL PLATE OF DIRECT PATTERN FORMING WATERLESS PLANOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide an original plate of a direct pattern forming waterless planographic printing plate capable of providing a printing plate having good image reproducibility with water or a developing solution prepared by adding a surfactant to water. SOLUTION: The original plate is obtained by laminating at ink receiving layer and a silicone rubber layer in this order on a base. When the original plate is heated at 10 deg.C/min heating rate under a flow of gaseous helium and gas generated in this heating is measured (TG-GC/MS measurement), a gaseous decomposed body is generated in the range of 100-200 deg.C and the amount is 0.01-1 g/m2. The original plate is developed with water or an aqueous solution prepared by adding a surfactant to water after being irradiated with laser beam.