Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including use of vacuum
Patent
1994-11-18
1997-06-17
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including use of vacuum
264102, 264313, 264318, 2643286, 249139, 425440, 425DIG44, B29C 4537, B29C 4544
Patent
active
056394160
ABSTRACT:
A process for molding dimensionally accurate plastic articles using a low pressure injection molding technique. The process utilizes a two-piece silicone rubber mold having a cavity representative of the shape of the article to be molded. The mold is substantially encased on all sides in a rigid mold box to prevent deformation of the cavity during the molding process (10). The mold box and the encased mold are placed in a vacuum chamber, and a vacuum is drawn on the chamber to evacuate the cavity (20). A predetermined amount of a reactive mixture is simultaneously mixed and injected under pressure into the mold to form the plastic article (30). The amount of material injected is sufficient to fill the cavity but not sufficient to distort the cavity. The chamber is vented (40) and the mold is removed from the mold box (50). The mold is flexed in order to remove the plastic article from the mold (60).
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Jackson Gregory D.
Megleo Louis D.
Pennisi Robert W.
Urbish Glenn F.
Dorinski Dale W.
Heitbrink Jill L.
Motorola Inc.
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