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Patent Searching and Data


Title:
RACKET FRAME
Document Type and Number:
Japanese Patent JPH03280974
Kind Code:
A
Abstract:

PURPOSE: To improve the mechanical characteristic by forming a double-layer prepreg layer, which is formed by providing a thermoplastic resin film of a specific solubility on a fiber-reinforced prepreg surface used with epoxy resin as matrix resin, on the outer layer of an outer shell molded material.

CONSTITUTION: In the case of a racket frame in which an outer shell molded material 102 is provided around the periphery of a center material 101, a layer 1' of a double layer prepreg 1, constituted by providing a thermoplastic resin film 8 of 9.0 to 11.5 solubility parameter on the surface of a fiber-reinforced prepreg 6 used with epoxy resin as matrix resin 4, is formed on at least the outermost layer of the outer shell molded material 102. In this racket frame, improvement of repulsive force, prevention from breaking and increase of impact absorbing characteristic can be attained by giving toughness to improve while mechanical characteristic such as tensile strength, compression strength, elastic modulus, etc., to improve.


Inventors:
MURAKAMI SHINKICHI
TAKEZAWA MAKOTO
INOUE HIROSHI
Application Number:
JP8237890A
Publication Date:
December 11, 1991
Filing Date:
March 29, 1990
Export Citation:
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Assignee:
TONEN CORP
International Classes:
A63B49/10; A63B49/02; A63B49/14; B32B5/02; B32B27/38; A63B102/02; A63B102/04; A63B102/06; (IPC1-7): A63B49/02; A63B49/10; B32B5/02; B32B27/38
Attorney, Agent or Firm:
Kurahashi Akira