Resin molding method and apparatus

Details Resin molding method and apparatus Resin molding method and apparatus

1994-04-12

1995-10-24

Heitbrink, Jill L.

Plastic article or earthenware shaping or treating: apparatus

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

With preform severing means movable relative to mold

264 37, 2643289, 425556, 425564, 425566, 425577, 425DIG51, 425DIG224, B29C 4524

Patent

active

054605083

ABSTRACT:
To provide a resin molding method and apparatus that may realize a sprue runnerless system with a very simple structure and at a low cost, a molten resin 4 is fed from a resin supply portion 1 into a pair of cavities 3 through a resin passages 2 such as a sprue portion 2A and a pair of runner portion 2B for molding the resin. The method includes the following steps of: moving a resin return member 5 toward the resin supply portion 1 after supplying the molten resin 4 into the cavities 3, the resin return member 5 being disposed so as to be projectable into the resin passage 2 and movable through the resin passage 2; and returning a waste molded resin 6 under a molten/solid condition within the resin passage 2 back into the resin supply portion 1 under a molten condition by a heat of the resin supply portion 1.

REFERENCES:
patent: 2613395 (1952-10-01), Massler
patent: 2698460 (1955-01-01), Amo
patent: 2698464 (1955-01-01), Wilson
patent: 3112523 (1963-12-01), Goulet et al.
patent: 3824298 (1974-07-01), Sherer

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