Patents
United States Patent 4729666
Douris , ê et al. March 8, 1988
Screw for molding thermoplastic resin having a stress relaxation section
Takubo March 8, 1988
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.
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