Valve-gated injection molding mechanism

Details Valve-gated injection molding mechanism Valve-gated injection molding mechanism

1976-10-12

1977-10-11

Shore, Ronald J.

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...

425DIG227, B29F 100

Patent

active

040532712

ABSTRACT:
This invention relates to an improved seal for injection molding mechanism. The lower nozzle portion of a heater with the reciprocal valve pin extending centrally therethrough extends downwardly to the gate in the mold. The generally cylindrical seal is horizontally located in an outward upward flare of the air space between the lower nozzle portion and the mold. The seal has a V-shaped lower surface which provides inner and outer circumferential lips which prevent the pressurized melt from flowing upward past the seal. The outer wall of the seal extends across the flare of the air space with only a portion of the outer lip abutting on the mold, thus substantially reducing heat loss from the heater through the seal to the cooled mold. The seal is located sufficiently far from the gate that the reduced heat loss through it is not from the direct gate area but sufficiently close that the melt which is injected into the remaining accessible air space is sufficiently small to be drawn into the cavity on each successive injection to avoid a color streaking problem. The outer lip is thicker than the inner lip to avoid it rupturing into the flare of the air space.

REFERENCES:
patent: 2928125 (1960-03-01), Smucker et al.
patent: 3113346 (1963-12-01), Bright
patent: 3669596 (1972-06-01), Sanory
patent: 3677682 (1972-07-01), Putkowski

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