Composite aluminum plate for lithographic printing.

摘要

A composite aluminum sheet for a presensitized lithographic printing plate comprises a substrate such as a thermoplastic sheet and an aluminum foil which has a matt surface with a roughness of 0.45-0.65 µm R, on one side thereof and is produced by repeatedly rolling doubled aluminum foils twice or more, the substrate being laminated on the aluminum foil so that its matt surface faces outside. A presensitized plate for lithography having excellent printing properties such as printing runnability can be prepared from the composite aluminum sheet.