MANUFACTURE OF RACKET FRAME OR STICK

Japanese Patent JPH01185272

A

PURPOSE:To enhance productivity of the racket frame or stick stated in the caption and improve reduction of weight, rigidity and strength thereof in a slim configuration by setting a core covered with reinforcing continuous fibers in a metallic mold, injecting or extruding preheated and molten thermoplastic resin through an injection port provided on the metallic mold and hardening and taking the resin out of the mold. CONSTITUTION:A plurality of reinforcing continuous fiber layer 2 are spread along the outer periphery of a core 1, then the core 1 covered with the reinforcing continuous fiber layers 2 is set in a metallic mold 3. The metallic mold 3 consists of a left-hand metallic mold 31 and a right-hand metallic mold 32 and both right and left-hand molds 32, 31 are constructed to be capable of being opened and closed. The left-hand mold 31 and the right-hand mold 32 are closed and thermoplastic resin preheated and molten in a cylinder 5 is injected or extruded in the mold through an injection port 4 provided on the right-hand mold 32, then cooled and taken out of the mold. The thermoplastic resin is either one of such substances as a homopolymer of polyphenylene oxide or a blend consisting of nylon and polystylenic resin, or liquid crystal polymer, polycarbonate, acetal resin or terpolymer composed of acrylonitrile-butadiene-stylene and so forth.

KITAYAMA MOTOZUMI

JP923888A

July 24, 1989

January 19, 1988

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BRIDGESTONE CORP

A63B49/10; A63B49/14; A63B102/02; A63B102/04; A63B102/06; (IPC1-7): A63B49/10; A63B49/14

Takeo Masuda

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