Mold loading method and apparatus

Details Mold loading method and apparatus Mold loading method and apparatus

1985-08-19

1987-05-12

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264302, 425256, 425257, B29C 4118

Patent

active

046648640

ABSTRACT:
Apparatus and a process 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: 1123246 (1915-01-01), Clarke
patent: 3301925 (1967-01-01), Engel
patent: 3315016 (1967-04-01), Wersosky et al.
patent: 3418694 (1968-12-01), Strauss
patent: 3492307 (1970-01-01), Hoskinson
patent: 3506755 (1970-04-01), Rudder et al.
patent: 3744951 (1973-07-01), Szutkowski
patent: 4167382 (1979-09-01), Freedman
patent: 4217325 (1980-08-01), Colby

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