Support for lithographic printing plate and method of manufacturing the same
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United States of America Patent
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Dec 30, 2003
Grant Date -
Apr 25, 2002
app pub date -
Sep 6, 2001
filing date -
Sep 6, 2000
priority date (Note) -
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Abstract
A support for a lithographic printing plate with no damage in appearance such as unevenness in the form of streaks and with excellent pit homogeneity. A support for a lithographic printing plate obtained by subjecting a surface of an aluminum alloy plate to a surface treatment including alkali etching and an electrochemical graining treatment, wherein the aluminum alloy plate shows dispersion of 50% or lower for each element, the dispersion being defined by an specific equation with regard to contents of Fe, Si, Mn, Mg and Sn in a surface layer portion thereof which is from the surface to a depth of 1 .mu.m.
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