Device for injection molding articles of plastics material which

Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...

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Details

264572, 425536, 425564, 425566, B29C 4516

Patent

active

058956670

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: 4150689 (1979-04-01), Britten
patent: 4285661 (1981-08-01), Yotsutsuji et al.
patent: 4368847 (1983-01-01), Ersfeld
patent: 4917594 (1990-04-01), Gellert et al.
patent: 4990083 (1991-02-01), Bernhardt

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