Lithoplate and method for making same
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United States of America Patent
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-
Feb 16, 1993
Grant Date -
N/A
app pub date -
Jan 7, 1991
filing date -
Dec 8, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method of making a lithoplate from a 5XXX type alloy which includes controlling the composition and casting practices to eliminate forming a pine tree metal structure in an ingot used for rolling a workpiece to be made into lithoplate. The method also includes homogenizing and hot rolling the ingot at a controlled initial temperature to produce a desired grain and metal microstructure in the sheet rolled from the ingot which is suited for providing a surface having substantially uniform and evenly distributed craters produced by an electrochemical method of graining.
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