Rotational mold with valved charge box

Details Rotational mold with valved charge box Rotational mold with valved charge box

1987-03-16

1988-02-02

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425256, 425261, 425435, B29C 4104

Patent

active

047226781

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.

REFERENCES:
patent: 3301925 (1967-01-01), Engel
patent: 3315016 (1967-04-01), Wersosky
patent: 3418694 (1968-12-01), Strauss
patent: 3492307 (1970-02-01), Boyce
patent: 4167382 (1979-09-01), Freedman et al.
patent: 4217325 (1980-08-01), Colby
patent: 4562025 (1985-12-01), Gray
patent: 4606868 (1986-08-01), Christoph

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