Method of forming perforations in a structure during molding thereof
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United States of America Patent
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Sep 19, 1995
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N/A
app pub date -
Mar 24, 1994
filing date -
Mar 24, 1994
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Abstract
A thermoforming technique for making a shaped article from a web of polystryrene foam sheet or the like, with simultaneous forming and perforation of the article. Serrated cutter and spaced mandrel elements mounted in opposing mold sections provide a perforated pattern in the sheet.
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