Sports ball bladder and method of manufacture

Details Sports ball bladder and method of manufacture Sports ball bladder and method of manufacture

1996-08-22

1998-07-14

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264516, 473610, 29453, B29C 4920

Patent

active

057799687

ABSTRACT:
A sports ball bladder and method of manufacture which produces a sports ball in which a valve element (48) is fused to the bladder and is disposed away from a parting line (40) of a mold (34). The bladder is made by extruding a parison (64) and closing a mold cavity (42) in surrounding relation thereof. A blow needle (46) supports the valve element thereon and delivers fluid pressure to an interior area (68) of the parison. The expanding parison fills the mold cavity and impinges on the valve element. The expanded parison is cooled to solidify the thermoplastic material. The pressure in the interior area is then relieved through the blow needle and the mold is opened. To avoid thinning of the bladder adjacent to the parting line, thermoplastic material is pushed inwardly into the mold cavity from a pinch pocket (80) as the mold is closed. After the ball bladder is formed, a valve member (72) is inserted into the valve element to enable holding of the bladder in an inflated condition.

REFERENCES:
patent: 1388123 (1921-08-01), Roberts
patent: 2295804 (1942-09-01), Olson
patent: 2405149 (1946-08-01), Kempthorn
patent: 2509882 (1950-05-01), Roberts
patent: 3411974 (1968-11-01), Jone-Hinton et al.
patent: 4277300 (1981-07-01), Taluba et al.
patent: 4340222 (1982-07-01), Kerkenbush et al.
patent: 5033498 (1991-07-01), Brandt
patent: 5294112 (1994-03-01), Smith
Derwent Abstract, Japanese Patent Application 54-093061.

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