Composite aluminum sheet for presensitized lithographic printing plate comprising a support having specified center line average roughness
AssigneeNippon Foil Manufacturing Co., Ltd.
InventorsHironori Kitamura, Kanji Noma
Life of this patent
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Abstract
A composite aluminum sheet for a presensitized lithographic printing plate comprises a support such as a thermoplastic sheet and an aluminum foil which has a matt surface with a roughness of 0.20-0.65 .mu.m R.sub.a on one side thereof and is prepared by twice or more repeatedly pack rolling doubled aluminum foils, the support being overlaid with the aluminum foil so that the matt surface thereof faces outside. A presensitized plate for lithography having excellent printing properties such as printing runnability can be prepared from the composite aluminum sheet.
Claims8
A composite sheet for a presensitized lithographic printing plate, comprising a support of a synthetic resin film and an aluminum foil thereon, said aluminum foil having a matt surface with a roughness of 0.20 to 0.65 .mu.mR.sub.a on one surface thereof and a thickness of from 7 to 80 .mu.m, said foil prepared by twice or more pack rolling doubled aluminum foils under the conditions of a roll load of 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65%, said aluminum foil positioned on said support so that the matt surface thereof faces outside.
A method for producing a composite sheet for a presensitized lithographic printing plate, comprising subjecting doubled aluminum foils to the pack rolling process twice or more under the conditions of a roll load of 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65% to obtain an aluminum foil with a matt surface with a roughness of 0.20 to 0.65 .mu.mR.sub.a on one surface thereof and a thickness of from 7 to 80 .mu.m, and adhering said aluminum foil to a support of a synthetic resin film.
Dependencies are inferred from the claim text.