Device for injection molding articles of plastics material which

Details Device for injection molding articles of plastics material which Device for injection molding articles of plastics material which

1994-06-13

1995-11-14

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, 425536, 425564, 425566, B29C 4520

Patent

active

054661412

ABSTRACT:
A device for injection molding articles of plastics material having hollow spaces. The device includes a molding tool with a mold cavity. Plastics material melt is fed to the mold cavity through a nozzle. Another pressurized medium is supplied to the mold cavity through a hollow needle at a location different from the location of the nozzle. A needle core is mounted in the hollow needle. The needle core is axially displaceable within certain limits. The opening of the hollow needle to the mold cavity can be opened and closed or its cross-sectional area can be varied by moving the needle core.

REFERENCES:
patent: 3937610 (1976-02-01), Farrell
patent: 4101617 (1978-07-01), Friedrich
patent: 4150689 (1979-04-01), Britten
patent: 4285661 (1981-08-01), Yotsutsuji et al.
patent: 4368847 (1983-01-01), Ersfeld
patent: 4740150 (1988-04-01), Sayer
patent: 4917594 (1990-04-01), Gellert et al.
patent: 4990083 (1991-02-01), Bernhardt

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