Apparatus for multi-cavity injection molding

Details Apparatus for multi-cavity injection molding Apparatus for multi-cavity injection molding

1991-06-12

1992-09-22

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

26432815, 425549, 425562, 425564, 425572, B29C 4577

Patent

active

051495473

ABSTRACT:
Apparatus and methods suitable for controlling and metering thermoplastic material or resin to multiple cavities in a multi-cavity injection molding tool are described, whereby the amount of resin injected into each cavity can be individually controlled. This system minimize overfilling or underfilling of individual article cavities in such a multiple cavity tool and, therefore, allows for the production of more uniform plastic articles from a multiple cavity mold or tool. In practice, a spindle, which is designed to rotate in a reproducible manner as resin flows past it, is inserted into the resin stream feeding each cavity. The amount of resin fed to a particular cavity is determined by measuring the rotation of the spindle. When the amount of resin fed to a particular cavity is equal to the amount appropriate for that cavity (the target amount), the shut-off valve associated with that cavity is activated, thereby terminating the resin flow to that cavity without affecting resin flow to the other cavities. Resin flow is continued until all cavities are filled with their respective target amounts of resin. The apparatus and methods of this invention are especially adapted for use in gas-assisted injection molding using multi-cavity equipment.

REFERENCES:
patent: 4095931 (1978-06-01), Reitan
patent: 4101617 (1978-07-01), Friederich
patent: 4279582 (1981-07-01), Osuna-Diaz
patent: 4781554 (1988-11-01), Hendry
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4923666 (1990-05-01), Yamazaki et al.
patent: 4923667 (1990-05-01), Sayer
patent: 4943407 (1990-07-01), Hendry

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