Support for lithographic printing plate
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Sep 29, 1999
filing date -
Oct 1, 1998
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Abstract
A support for a lithographic printing plate in which uniform pits are efficiently formed by electrochemically graining treatment, always independently of electrolytic conditions to give excellent printing performance, which comprises an aluminum alloy plate containing 0.05% to 0.5% by weight of Fe, 0.03% to 0.15% of Si, 0.006% to 0.03% by weight of Cu and 0.010% to 0.040% by weight of Ti, wherein the Cu concentration of a surface layer portion of from a surface to a depth of 2 .mu.m of the aluminum alloy plate is at least 20 ppm higher than that of a region deeper than the surface layer portion.
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