Molding process and apparatus
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
Sep 14, 1987
filing date -
Sep 14, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A flow molding process and associated molding apparatus for making plastic parts employing a radio-frequency heating field. In a two-piece mold, a diaphragm is supported thereacross and over a foam plastic compound that is disposed in the bottom half of the mold. A fluid is adapted to be introduced into the mold against the diaphragm. The introduction of this fluid is controlled to initially inject the fluid into the mold to cause deflection of the diaphragm to thus expel substantially all air from the mold and to thereafter extract the fluid from the mold during the heating cycle as the material expands, the extraction causing a vacuum that assists in the plastic foam compound expansion.
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