Fabrication of a composite material racket frame

Details Fabrication of a composite material racket frame Fabrication of a composite material racket frame

1982-11-16

1985-04-16

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264257, 264573, 264DIG83, 273 73F, 273 73J, B29D 2700

Patent

active

045115230

ABSTRACT:
A method for producing a reinforced composite racket frame having an outer shell made of a fiber reinforced thermosetting plastic material and a foam core comprising the steps of: (a) placing an open-ended tubular shell of fiber reinforced thermosetting plastic material in a racket frame mold with two valve members respectively provided at an outlet and an inlet of the mold; (b) heating the mold to a first predetermined temperature for curing the tubular shell; (c) causing one of the valve members to be open and the other valve to be closed; (d) applying compressed air through the open valve to force the shell into intimate contact with an inner surface of the mold, the shell thereby assuming the shape of the mold; (e) cooling the mold to a second predetermined temperature at which the tubular shell becomes set to the mold shape; (f) opening the closed valve; (g) introducing a predetermined amount of a foamable material through at least one of the valves and into the shell; and (h) closing both of the valve members to allow the forming of a foam material at the second predetermined temperature within the tubular shell to form a core of the racket.

REFERENCES:
patent: 4268571 (1981-05-01), McCarthy
patent: 4294787 (1981-10-01), Lo
patent: 4297308 (1981-10-01), Popplewell

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