Injection molding apparatus having a sprue holder with an inclin

Details Injection molding apparatus having a sprue holder with an inclin Injection molding apparatus having a sprue holder with an inclin

1983-07-28

1985-02-12

Anderson, Philip

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

264 455, 2643289, 264DIG83, 425566, 425DIG51, B29F 103, B29F 105, B29D 2700

Patent

active

044988605

ABSTRACT:
A process of producing a moulding by introducing thermoplastics material into a mould space through gate means having a passageway, which process includes the formation of a sprue in the passageway. A retractable member cuts off the sprue before the material solidifies and closes the passageway at its junction with the mould space, the sprue being subsequently ejected from the passageway of the gate means before the next moulding cycle. A holder provides the gate means and the retractable member which is preferably inclined to the passageway. The gate means may also provide air ejecting means for removing the sprue and may conveniently be bolted onto an otherwise conventional injection moulding machine. The retractable member may incorporate a feed pipe for injecting a fluid into the plastics material.

REFERENCES:
patent: 3231938 (1966-02-01), Seymour
patent: 3436446 (1969-04-01), Angell, Jr.
patent: 3847526 (1974-11-01), Fries
patent: 3996330 (1976-12-01), Jones et al.
patent: 4077760 (1978-03-01), Sauer
patent: 4129635 (1978-12-01), Yasuike et al.
patent: 4255368 (1981-03-01), Olabisi

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