Support for planographic printing plate
AssigneeFuji Photo Film Co., Ltd.
InventorsAkio Uesugi, Tsutomu Kakei
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Abstract
Disclosed is a support for planographic printing plate prepared by a process which comprises subjecting molten aluminum alloy to continuous casting by a twin-roll continuous casting machine to directly caste a plate, subjecting the plate to cold rolling and heat treatment once or more times, respectively, reforming the plate, and then surface graining the plate, wherein crystalline grains on a cross section of the finished plate (a) have an average diameter in circle equivalence of 15 .mu.m to 35 .mu.m, (b) contain those having an average diameter in circle equivalence of not less than 40 .mu.m in a proportion of not more than 30% and (c) assume a shape factor of not less than 4.0.
Claims8
A support for planographic printing plate prepared by a process which comprises subjecting molten aluminum alloy to continuous casting by a twin-roll continuous casting machine to directly cast a plate, subjecting the plate to cold rolling and heat treatment once or more times, respectively, reforming the plate, and then surface graining the plate, wherein crystalline grains on a cross section of the finished plate (a) have an average diameter in circle equivalence of 15 .mu.m to 35 .mu.m, (b) contain those having a diameter in circle equivalence of not less than 40 .mu.m in a proportion of not more than 30% and (c) assume a shape factor of not less than 4.0.
Dependencies are inferred from the claim text.