Method of making game racket frame of plastic compound material

Details Method of making game racket frame of plastic compound material Method of making game racket frame of plastic compound material

1992-07-15

1994-06-21

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264258, 264314, 156156, 156187, 156188, 156194, 156245, 273 73F, B29C 4302

Patent

active

053222490

ABSTRACT:
A method of making game racket frame of plastic compound material includes a tubular body, which is formed by a bendable inner tube wrapped orderly and windingly with the cured thermoplastic plastic thin films and the long fiber fabric sheets made up of a plurality of long fiber bundles. The tubular body is placed in a mold cavity of a molding tool, which is subjected to a heat corresponding to the melting point of the thermoplastic plastic thin film. A gas with a first predetermined pressure is introduced into the tubular body so as to force the molten thermoplastic plastic thin film to diffuse uniformly into the interstices of the fiber bundles. Another gas having a second predetermined pressure is introduced into the tubular body to force the outer shell of tubular body to attach intimately to the wall of mold cavity of the molding tool, which is then cooled to permit the removal of the racket frame made therein. The method produces a recyclable racket frame and no waste causing environmental pollution.

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patent: 5047263 (1991-09-01), Glemet
patent: 5176868 (1993-01-01), Davis
patent: 5198058 (1993-03-01), You

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