Process for graining an aluminum base lithographic plate and article thereof
AssigneeHoward A. Fromson
InventorsHoward A. Fromson, Robert F. Gracia
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Abstract
Planar surfaces are roughened by graining with an aqueous slurry of unfused platy, crystalline alumina. Preferably, an aluminum base with is adapted to receive a light-sensitive coating thereon to make lithographic plate is grained with said aqueous slurry.
Claims14
Process for making a lithographic printing plate comprising an aluminum base which comprises graining said aluminum base with an aqueous slurry comprising unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum.
Lithographic printing plate comprising an aluminim base, said base being grained with an aqueous slurry of unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum base.
Lithographic printing plate comprising an aluminum base coated with a light-sensitive material, said base being grained with an aqueous slurry comprising unfused, platy crystalline alumina while applying a rotary brushing motion whose force vector is predominantly tangential to the surface of the aluminum base, before application of said light-sensitive coating.
Dependencies are inferred from the claim text.