The straight-writing die water it is not planographic printing edition basic plate

摘要

PROBLEM TO BE SOLVED: To suppress the reflection of laser beam on a metal membrane and to efficiently absorb laser beam by forming a thermal layer from a carbon membrane and a metal membrane in a direct drawing type waterless planographic base plate obtained by successively laminating a thermal layer and a silicone rubber layer on a substrate. ;SOLUTION: A planographic printing base plate made printable without using soaking water is obtained by successively laminating a thermal layer formed by providing a carbon membrane on a metal membrane and a silicone rubber layer. Metal has an m.p. of 2000K or less and is composed at least one kind selected from a group consisting of titanium, aluminum, nickel, iron, chromium, tellurium, tin, antimony, gallium, magensium, polynium, selenium thallium, zinc and bismuth or an alloy composed of a combination of two kinds selected from a group consisting of tellurium, tin, antimony, gallium, bismuth and zinc. The thickness of the thermal layer is set to 1000Å or less and the optical density thereof is set to 0.6-2.3.;COPYRIGHT: (C)1997,JPO