Method for thermoforming
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United States of America Patent
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Apr 25, 2006
Grant Date -
Jun 17, 2004
app pub date -
Feb 7, 2003
filing date -
Dec 11, 2002
priority date (Note) -
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Abstract
A method and apparatus for thermoforming deep drawn parts such as cups in which a vacuum is momentarily applied to a preheated sheet material when overlying a clamping plate prior to clamping and advance of the plug assists to delay contact with a lip molding feature projecting from each mold cavity. This avoids a molding defect due to premature cooling of a localized region of the sheet material when the sheet material comes into contact with the lip molding features.
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