Injection molding process

Details Injection molding process Injection molding process

1985-01-07

1986-12-09

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 37, B29C 4576

Patent

active

046279520

ABSTRACT:
The present invention provides an improved process for molding thermotropic liquid crystalline polymer, and the apparatus for such process. The process comprises the steps of providing a molten stream of the polymer to be molded; injecting the molten stream into the cavity of the mold; continuously allowing a portion of the melt to flow out of the cavity during the entire filling of the cavity so as to substantially preserve the laminar flow pattern of the melt in the cavity; and solidifying the molten polymer into a molded article. The resulting articles have mechanical properties superior to conventionally molded articles.

REFERENCES:
patent: 2803043 (1957-08-01), Stephens
patent: 3016574 (1962-01-01), Fischer et al.
patent: 4008031 (1977-02-01), Weber
patent: 4083829 (1978-04-01), Calundann et al.
patent: 4299756 (1981-11-01), Calundann
Rheology of Polymers, E. T. Severs, Reinhold Pub. 1962, pp. 126-127.

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