Plastic sheet having high gloss and low coefficient of friction and method for producing the same
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United States of America Patent
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-
Oct 16, 1984
Issued Date -
N/A
app pub date -
Apr 29, 1983
filing date -
Mar 22, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plastic sheet (13) having a surface with low friction and high gloss is produced by extruding a layer of thermoplastic and pressing it while hot against the surface of a chill roller (17). The surface of the chill roller (17) is characterized by being highly polished and having minute randomly distributed depressions therein of an average depth of about 5 microns, a depth standard deviation of less than 3 microns, and an average frequency of about 3,000 per square centimeter. The thermoplastic layer may be laminated to a single or multilayer base (12) to form a finished product (21). A polyethylene surface layer will have a coefficient of friction generally less than 1.0 with respect to itself, while the surface nonetheless retains a high gloss appearance.
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