Process of molding seal rings

Details Process of molding seal rings Process of molding seal rings

1986-04-02

1990-09-18

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

295271, 264266, 264296, 2643282, 425DIG47, B29C 4514, B29C 4522, B29C 4538

Patent

active

049576801

ABSTRACT:
The seal ring is molded by positioning a frame or reinforcement in one part of an opened mold, and positioning a low friction material disc on a clamping surface of the same part of the mold. The mold is closed with a second part so that between 30% and 70% of the disc is clamped and squeezed between opposed surfaces of the mold parts, and the reinforcement or frame is held in position in the closed mold. A vacuum is drawn in the mold, and an elastomer is injected to form a body or lip connecting the reinforcement to the disc. The molded ring is removed from the mold and excess lip material and at least the portion of the disc which was clamped are cut off to form the finished seal ring. The low friction material disc can contain PTFE.

REFERENCES:
patent: 3063097 (1962-11-01), Jutzi
patent: 3754846 (1973-08-01), Choate
patent: 3950119 (1976-04-01), Reichenbach
patent: 4239243 (1980-12-01), Bainard et al.
patent: 4258927 (1981-03-01), Cather, Jr.
patent: 4331316 (1982-01-01), Cather, Jr.
patent: 4406847 (1983-09-01), O'Neal et al.
patent: 4555376 (1985-11-01), Butler

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