Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1991-02-15
1992-06-02
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 406, 2643288, 26432812, 26432813, 26432816, 264572, 425144, 425149, 425546, 425552, 425562, 425567, 425568, 425812, B29C 4576, B29C 4578, B29D 2200
Patent
active
051184559
ABSTRACT:
A method and apparatus for providing gas assistance in a resin injection molding process of the type in which hot resin is injected into a mold, gas is injected into the mold to displace a portion of the resin in the mold, the resin cools, the gas is vented, and the mold is opened to remove the molded part. The apparatus includes a high pressure gas storage system, a plurality of pressure control assemblies set at varying pressures and interposed between the high pressure gas storage system and the injection nozzle, and a control system which is operative to selectively communicate each of the pressure control assemblies with the injection nozzle so as to allow the delivery of gas at varying pressures to the mold to facilitate the creation of an individualized gas pressure profile to suit the particular molding requirement. The apparatus further includes a supplemental gas storage system including a plurality of gas storage containers interposed between the pressure control assemblies and the injection nozzle so that the supplemental gas storage system may be used in selective cooperation with the pressure control assemblies to provide further versatility with respect to the ability to tailor the pressure profile to the particular molding requirement.
REFERENCES:
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patent: 4740150 (1988-04-01), Sayer
patent: 4781554 (1988-11-01), Hendry
patent: 4824732 (1989-04-01), Hendry et al.
patent: 5039463 (1991-08-01), Loren
patent: 5047183 (1991-09-01), Eckardt et al.
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