VACUUM FORMING PROCESS AND USE
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United States of America Patent
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Issued Date -
Jun 11, 2015
app pub date -
Jun 20, 2013
filing date -
Jul 4, 2012
priority date (Note) -
Abandoned
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Abstract
A vacuum thermoforming process for producing a transparent molding free from optical defects, whereby the prior temperature of the mold and preform is controlled, the preform is premolded, the mold is shaped under sub-atmospheric pressure, the mold shape is cooled, and the transparent molding is removed. The transparent plastic molding is produced from polymethyl methacrylate (PMMA) or polycarbonate (PC) with particularly good optical quality and with relatively low cycle times. Upon removal, these moldings are dimensionally stable, free from distortion, and exhibit no surface defects such as pimples.
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