Method of electrolytically graining a lithographic plate
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United States of America Patent
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Oct 22, 1985
Grant Date -
N/A
app pub date -
Sep 28, 1984
filing date -
Sep 28, 1984
priority date (Note) -
Expired
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Abstract
A method is provided for electrolytically graining an aluminum lithographic plate to produce a grained surface with a honeycomb topography, non-directional grain structure, and a substantially reduced production of smut. The reduction of smut is achieved by utilizing an alternating current of higher frequencies, generally in the range of approximately 140 to 400 Hz.
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