Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se
Patent
1997-05-02
2000-08-29
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
264225, 264301, 264308, 264314, 264257, 264258, 249 65, 249178, B28B 732, B32B 3104
Patent
active
061104078
ABSTRACT:
The present invention relates to an improved apparatus and method for manufacturing shafts from composite materials, particularly shafts for golf clubs. An elongate mandrel, having a passage therein and having a plurality of holes between the passage and an outer surface of the mandrel, includes a flexible bladder, preferably latex, dipped and cured directly on the outer surface of the mandrel. A set of plies of pre-preg composite sheet is wrapped around the mandrel in a predetermined manner. The wrapped mandrel is placed in a mold, the bladder is inflated to a predetermined pressure. The pressurized wrapped mandrel is then heated for a predetermined period of time to cure the composite material to form a shaft, preferably for a golf club. While the shaft is cured in the mold, gas of a predetermined pressure is introduced through the passage in the mandrel to inflate the bladder and force the composite sheet against the walls of the mold.
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Callaway Golf Company
Catania Michael A.
Heitbrink Jill L.
McDowell Suzanne E.
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