Method of producing hollow moulded members

Details Method of producing hollow moulded members Method of producing hollow moulded members

1980-03-27

1981-05-19

Flint, Jr., J. Howard

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

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

Patent

active

042684757

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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