Aluminum alloy sheet for lithographic printing plates and method

Alloys or metallic compositions – Zinc base – Aluminum containing

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420537, 420538, 420531, 420540, 420548, 420550, 420551, 420552, 148437, C22C 2100

Patent

active

057955417

ABSTRACT:
An aluminum alloy sheet for printing plate contains Fe: 0.2 to 0.6 Wt %, Si: 0.03 to 0.15 Wt %, Ti: 0.005 to 0.05 Wt %, Ni: 0.005 to 0.20 Wt %, and remainder of Al and inevitable impurity, wherein a ratio of Ni content and Si content satisfies 0.1.ltoreq.Ni/Si.ltoreq.3.7. The aluminum alloy sheet is manufactured by homogenizing an aluminum alloy ingot at a temperature in a range of 500.degree. to 630.degree. C., after performing hot rolling at start temperature in a range of 400.degree. to 450.degree. C., providing cold rolling and intermediate annealing, and further performing final cold rolling. By this, the aluminum alloy sheet for printing plate is prevented from pit generation upon dipping in electrolytic solution in a condition where an electric power is not applied. Uniformity of grained surface of the aluminum alloy sheet by electrolytic treatment can be improved.

REFERENCES:
patent: 4634656 (1987-01-01), Ohashi et al.
patent: 4729939 (1988-03-01), Nishikawa et al.
patent: 5110371 (1992-05-01), Moriyama et al.
patent: 5336341 (1994-08-01), Maejima et al.

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