Thermoforming method and apparatus
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United States of America Patent
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Apr 17, 2007
Grant Date -
Feb 24, 2005
app pub date -
Sep 29, 2004
filing date -
Sep 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermoforming apparatus having a mold with an internal vacuum chamber and a quench for cooling a thermoplastic sheet while it remains on the mold. Because the quench cools the sheet, conventional cooling lines are eliminated from the mold. One method of using the thermoforming apparatus includes pushing a heated sheet towards the mold with a plug assist, drawing the heated sheet over the mold, creating a partial vacuum in the vacuum chamber of the mold to maintain the sheet on the mold and quenching the sheet on the mold in a quenching tank by moving the quenching tank to the mold.
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