Molding method for producing molded article having a hollow port

Details Molding method for producing molded article having a hollow port Molding method for producing molded article having a hollow port

1996-01-25

1998-01-06

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling fluid pressure in direct contact with molding...

264572, 425130, B29C 4500

Patent

active

057051070

ABSTRACT:
A method for the production of a molded article having a hollow portion by utilizing a gas compression apparatus having a gas source, a compressor composed of a piston and a cylinder, and a discharge valve for controlling the flow of pressurized gas discharged from the cylinder, the method comprising introducing the pressurized gas through the discharge valve into a molten resin injected into a cavity of a mold, under the control of the discharge valve while carrying out, in one molding cycle, the intake step of supplying gas from the gas source to the cylinder and the compression step of compressing the gas by movement of the piston in the cylinder, at least twice each on the basis of predetermined compressor operation conditions, and thereby forming the hollow portion in the molded article.

REFERENCES:
patent: 4824732 (1989-04-01), Hendry et al.
patent: 5015166 (1991-05-01), Baxi
patent: 5056997 (1991-10-01), Hayashi et al.
patent: 5141682 (1992-08-01), Steinbichler et al.
patent: 5599487 (1997-02-01), Gosdin et al.

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