Method and apparatus for forming a flexible thermoplastic resin foam article using an RF field
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United States of America Patent
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Jun 18, 1985
Grant Date -
N/A
app pub date -
Aug 16, 1982
filing date -
Aug 16, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and associated apparatus for forming a foam plastic article using a mold with a mold cavity and a pair of electrodes across which an RF field may be impressed. The foam material that is to be processed is inserted into the mold and is then compressed. The compression may be at least on the ratio of 2 to 1 and perhaps as high or higher than 8:1. An RF heating field is applied while maintaining the foam material compressed and after the heat is terminated, the foam material is permitted to expand to conform to a mold shape as the material cools. This pre-compression step enables substantial reduction in processing time.
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