Method for molding materials

Details Method for molding materials Method for molding materials

1976-05-28

1979-04-24

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

249 79, B28B 704

Patent

active

041512367

ABSTRACT:
An improvement in the method of operating a molding apparatus for use in molding plastic and other materials is provided. The inner mold surfaces of the apparatus are flooded, during operation, with a dehumidified gas such as dry air to minimize condensation of moisture onto these surfaces. This dry air forms a field in the area of the mold surfaces to keep out the normally moist ambient air. The field is exhausted and recirculated to the supply source where it is regenerated and returned to the area of the mold surfaces. In this way, a continuous concentration of dry air is maintained in contact with the mold surfaces. One or more dry air curtains are also established around the dry air field to prohibit moist air from entering the field. The air curtain may be established from the same supply source as the dry field or from a separate source and may also be recirculated. A cloud of dry gas may be emitted outside of the air curtains to further inhibit the flow of moist ambient air to the mold surfaces.

REFERENCES:
patent: 3233416 (1966-02-01), Rainwater et al.
patent: 3789093 (1974-01-01), Bose
patent: 3930779 (1976-01-01), Farrell

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