Apparatus for reducing thermoplastic material compression mold cycle time
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United States of America Patent
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-
Aug 18, 1992
Grant Date -
N/A
app pub date -
Sep 1, 1989
filing date -
Sep 1, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermoplastic sheet is placed between a pair of mold members each having a thermal insulator and a mating metal mold insert. RF energy is applied to the inserts to dielectrically heat and melt the thermoplastic sheet. The heated sheet is then deformed in a low pressure press with the insulators. The insulators are then replaced with cool thermally conductive structures to shorten the cooling cycle time. The thermally conductive structures cool the sheet by pressing the sheet in a high pressure press.
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