Rotational mold with valved charge box
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United States of America Patent
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-
Feb 2, 1988
Issued Date -
N/A
app pub date -
Mar 16, 1987
filing date -
Jun 3, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for manufacturing thin walled hollow parts such as automobile crash pads from dry thermoplastic powder includes a louver type valve system in the open end of a powder charge box and means for joining the charge box end-to-end with an open-ended heated mold for rotation so that the charge box will be inverted above the mold at the end of an upward swing movement during which the valve is closed to prevent flow of powder to the mold. Once the charge box is fully inverted the valve is opened to evenly distribute the powder into the mold by gravity flow to prevent excessive build-up of wall thickness on the mold surfaces.
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