System for preventing mandrel deflection in molding of thermopla

Details System for preventing mandrel deflection in molding of thermopla System for preventing mandrel deflection in molding of thermopla

1978-01-30

1978-12-05

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Core and positioning means therefor

425577, 425DIG5, 425562, 249 63, B29F 103, B29D 2302, B29C 106

Patent

active

041283813

ABSTRACT:
A system for preventing a mandrel located inside a mold from deflecting during the initial stage of the injection of thermoplastic material into the volume defined by the mandrel and mold is provided. A reciprocating centering member is coupled to a supply of thermoplastic material and is coaxially positioned with respect to the free end of the mandrel. During the initial stage of injection, the force generated by the injection pressure will urge the centering member into a recess defined by the mandrel. The centering member defines a fluid flow channel permitting the thermoplastic to be injected via the channel into the volume defined by the mandrel and mold. When substantial injection has occurred, the mold back pressure and a spring bias will move the centering member out of engagement with the mandrel.

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patent: 2822578 (1958-02-01), Lobell
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patent: 3509603 (1970-05-01), Halsall et al.
patent: 3752434 (1973-08-01), Herter
patent: 3767156 (1973-10-01), Sullivan et al.

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