| abstract |
An aluminum alloy rolled plate for a lithographic printing plate support is provided which has a uniform electrolytic graining property and excellent local development resistance of a photosensitive layer. It contains Cu 0.0001 to 0.03%, Ti 0.005 to 0.03%, Fe 0.1 to 0.5%, Si 0.05 to 0.20%, and the balance is substantially made of Al. When rolling the resulting Al alloy, the oil pit depth on the surface of the rolled plate is adjusted to 3 μm or less by adjusting the viscosity of the rolling oil in the final cold rolling to 4.5 cSt or less. Board manufacturing method. In addition to the above elements, an Al alloy containing a trace amount of one or more of In, Sn, Pb, Ni, and Be is used. [Selected figure] No applicable figure |