Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1988-10-07
1991-09-10
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
2643288, 26432812, 26432813, 264572, B29C 4576, B29D 2200
Patent
active
050471830
ABSTRACT:
A method and an apparatus of injection molding articles of thermoplastic material. The method includes initially forcing molten plastics material into an injection mold in an amount sufficient for forming the article. Subsequently, a flowable medium is forced into the injection mold with a pressure which distributes the plastics material uniformly over the surface of the mold cavity of the injection mold so as to form a hollow body. The hollow body is then cooled while the pressure of the medium is maintained. Finaly, the pressure of the medium is released and the molded article is removed from the injection mold. The pressure of the medium in the mold cavity is controlled and/or varied at least temporarily until the plastics material has cooled. The apparatus for carrying out the method includes a pressure reservoir for the medium which is connectible to the injection mold through lines. The lines include control and/or regulating elements.
REFERENCES:
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patent: 4601870 (1986-07-01), Sasaki
patent: 4685881 (1987-08-01), Sasaki
patent: 4789318 (1988-12-01), Ehritt
patent: 4855094 (1989-08-01), Hendry
English-Language Translation of Japanese Reference (Kokai) 54-123,173.
Eckardt Helmut
Ehritt Jurgen
Battenfeld GmbH
Tentoni Leo B.
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