Nozzle for gas assisted injection molding

Details Nozzle for gas assisted injection molding Nozzle for gas assisted injection molding

1991-06-18

1992-11-17

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

264572, 425562, 425564, B29C 4523

Patent

active

051642000

ABSTRACT:
A nozzle for the injection of a viscous fluid, such as a thermoplastic and a non-viscous fluid such as a gas into a mold cavity of a mold body includes a valve element mounted for reciprocation in a nozzle body flow passage to control a flow of viscous fluid through the nozzle body discharge end and into a mold cavity. The valve element includes a barrel having a first end selectively engaging a portion of the nozzle body discharge end to prevent a flow of viscous fluid therepast and a second end. A bore extends longitudinally through the barrel and a pin is positioned in the barrel bore. The pin has a first end located adjacent the barrel first end and a second end which is secured to the valve element such that the pin moves with the barrel as it reciprocates in the nozzle body. A non-viscous fluid flow passage is defined between the pin and the barrel.

REFERENCES:
patent: 2940123 (1960-06-01), Beck et al.
patent: 4033710 (1977-07-01), Hanning
patent: 4082226 (1978-04-01), Appleman et al.
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4140672 (1979-02-01), Kataoka
patent: 4555225 (1985-11-01), Hendry
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 4781554 (1988-11-01), Hendry
patent: 4905901 (1990-03-01), Johnson
patent: 5030076 (1991-07-01), Ebenhofer et al.
The Best of Two Worlds in Plastic Processing, Machine Design Magazine, Dec. 9, 1982, by Donald R. Dreger, Staff Editor.

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