Compression molding process
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United States of America Patent
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Jun 9, 1998
Grant Date -
N/A
app pub date -
Mar 5, 1996
filing date -
Mar 5, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A compression molding process for forming an article, preferably a preform or closure, is provided. The process includes the steps of forming thermoplastic resin into a precursor, wherein the precursor fits in a compression mold and has a shape for allowing the precursor to be supported in a predetermined or dimensionally preheld manner in a cavity of the compression mold prior to being compressed into a final shape, which shape is the shape of the compression mold; heating the precursor; and compression molding the precursor into the article while said precursor is heated. The step of forming may include the steps of extruding the resin into sheets; cutting discs from the sheets; and stacking the discs to form the precursors.
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