Fujifilm Corporation

Sumitomo Light Metal Industries, Ltd.

Hiroshi Ougi

Akio Uesugi

Atsushi Matsuura

Atsushi Hibino

Hirokazu Sawada

Shinya Kurokawa

Masanori Tsunekawa

Kazuaki Hatano

Koushi Nagae

An aluminum sheet material for lithographic printing plates wherein the number of aluminum carbide particles having a circle equivalent diameter, measured by the PoDFA method, of 3 &#x3bc;m or more is four or less, the number of aluminum carbide particles having a circle equivalent diameter, measured by the PoDFA method, of 3 &#x3bc;m or more.

Aluminum sheet material for lithographic printing plates

An aluminum alloy sheet for a lithographic printing plate includes 0.03 to 0.15% (mass %, hereinafter the same) of Si, 0.2 to 0.7% of Fe, 0.05 to 0.5% of Mg, 0.003 to 0.05% of Ti, and 30 to 300 ppm of Ga, with the balance being aluminum and inevitable impurities, a surface area of the aluminum alloy sheet having an average recrystallized grain size of 50 &#x3bc;m or less in a direction perpendicular to a rolling direction, an Mg concentration that is higher than the average Mg concentration by a factor of 5 to 50, and a Ga concentration that is higher than the average Ga concentration by a factor of 2 to 20, the surface area being an area up to a depth of 0.2 &#x3bc;m from the surface of the aluminum alloy sheet.

Aluminum alloy sheet for lithographic printing plate

An aluminum alloy sheet for a lithographic printing plate is obtained by homogenizing an ingot of an aluminum alloy at 500 to 610&#xb0; C. for one hour or more, the aluminum alloy containing 0.03 to 0.15% of Si, 0.2 to 0.6% of Fe, 0.005 to 0.05% of Ti, and 2 to 30 ppm of Pb, with the balance being aluminum and unavoidable impurities, subjecting the homogenized product to rough hot rolling, a start temperature of the rough hot rolling being 430 to 500&#xb0; C. and a finish temperature of the rough hot rolling being 400&#xb0; C. or more, holding the product subjected to rough hot rolling for 60 to 300 seconds after the completion of the rough hot rolling to recrystallize the surface of the product, and subjecting the resulting product to finish hot rolling that is finished at 320 to 370&#xb0; C. The aluminum alloy sheet has an average recrystallized grain diameter of 50 &#x3bc;m or less in a surface area in a direction perpendicular to a rolling direction, and has a Pb concentration 100 to 400 times an average Pb concentration in a surface area up to a depth of 0.2 &#x3bc;m from the surface of the aluminum alloy sheet.

Aluminum alloy sheet for lithographic printing plate and method of producing the same

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Tokyo, Japan

Hiroshi Ougi