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Abstract

An aluminum alloy sheet for a lithographic printing plate which allows pits to be more uniformly formed by an electrochemical surface-roughening treatment and exhibits more excellent adhesion to a photosensitive film and water retention properties, and a method of producing the same are disclosed. The aluminum alloy sheet includes 0.1 to 1.5% of Mg, more than 0.05% and 0.5% or less of Zn, 0.1 to 0.6% of Fe, 0.03 to 0.15% of Si, 0.0001 to 0.10% of Cu, and 0.0001 to 0.05% of Ti, with the balance being aluminum and impurities, the Mg content and the Zn content satisfying a relationship '4.times.Zn %-1.4%.ltoreq.Mg %.ltoreq.4.times.Zn %+0.6%', and the amount of aluminum powder on the surface of the aluminum alloy sheet being 0.1 to 3.0 mg/m.sup.2. It is more effective when precipitates with a diameter (circle equivalent diameter) of 0.1 to 1.0 .mu.m are dispersed on the surface of the sheet in a number of 10,000 to 100,000 per square millimeter (mm.sup.2).

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First Claim