Device for producing hollow molded members

Details Device for producing hollow molded members Device for producing hollow molded members

1979-06-08

1980-08-26

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425546, 425577, B29C 500, B29H 518, B29H 502, B29H 1700, B29F 106

Patent

active

042193176

ABSTRACT:
Production of hollow shaped bodies made of pourable and hardenable material, particularly polyurethane tires, in a mold cavity having a deformable membrane. The membrane is expanded to fill the mold cavity and expel air therein. Thereafter an amount of material required to produce the shaped body is introduced into the mold cavity and concomitantly the membrane is contracted to the form of the core. This minimizes air bubbles in the shaped body. A piston-cylinder unit movable with the inflow and outflow of liquid to the deformable membrane may be used to accurately control feed of polyurethane material to the mold cavity.

REFERENCES:
patent: 3879161 (1975-04-01), McGillvary
patent: 3902836 (1975-09-01), McIntosh
patent: 3932088 (1976-01-01), Harada et al.

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