Screw for molding thermoplastic resin having a stress relaxation

Details Screw for molding thermoplastic resin having a stress relaxation Screw for molding thermoplastic resin having a stress relaxation

1986-08-15

1988-03-08

Woo, Jay H.

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366 88, 366 89, 366 90, 366323, 425208, B29B 742

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047296666

ABSTRACT:
This invention relates to a screw used in an equipment for molding thermoplastic resin, in which a mixing section is provided at a position adjacent a shearing section, and the pitch of a stress relaxation section is preset to the pitch, at which satisfactory kneading can be performed without giving high shearing to the resin. With this screw, even if high-speed extrusion molding is performed, the pressure of resin is not fluctuated, molded parts can avoid lowered material quality and outstanding molded parts can be provided.

REFERENCES:
patent: 3584340 (1971-06-01), Koch
patent: 4099897 (1978-07-01), Takano et al.
patent: 4107260 (1978-08-01), Dougherty
patent: 4255379 (1981-03-01), Frankland, Jr.
patent: 4332932 (1982-06-01), Harada et al.
patent: 4666649 (1987-05-01), Takubo et al.
Fisher, E. G., Extrusion of Plastics, 1964, pp. 51-59.

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