Aluminum alloy plate for planographic printing plate
AssigneeMitsubishi Aluminum Co., Ltd.
InventorKeitarou Yamaguchi
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Abstract
An aluminum alloy plate for a planographic printing plate capable of being provided with a satisfactory roughed surface by electrolytic etching. The aluminum alloy plate contains 0.1 to 0.6% of Fe, 0.01 to 0.2% of Si, 5 to 150 ppm of Cu, and balance of Al and unavoidable impurities and has a surface layer portion formed of a metastable phase dispersion layer in which metastable phase AlFe-based intermetallic compound particles are dispersed. The metastable intermetallic compound particles each act as a starting point for pits. The alloy plate is formed with a roughed surface which is reduced in unetching and uniformly formed with pits, by electrolytic etching.
Claims32
An aluminum alloy plate for a planographic printing plate comprising, in a mass ratio, 0.2 to 0.6% of Fe, 0.01 to 0.2% of Si, 5 to 150 ppm of Cu, and balance of Al and having a surface layer portion which forms a dispersion layer in a metastable phase in which AlFe-based intermetallic compound particles are dispersed such that said dispersion layer contains, in a plane direction, the metastable phase AlFe-based intermetallic compound particles in a ratio of 5/100 or more to the number of stable phase AlFe-based intermetallic compound particles.
Dependencies are inferred from the claim text.