Sealing and shearing member in a plastic resin blow molding mach

Details Sealing and shearing member in a plastic resin blow molding mach Sealing and shearing member in a plastic resin blow molding mach

1976-03-02

1977-06-28

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Forming baffle, bottleneck, or handle

425527, 425531, 425532, 425535, B29C 1707

Patent

active

040322785

ABSTRACT:
In a blow molding machine a tubular parison is extruded around a blow pin, a two-part mold is closed and the parison is expanded by air pressure against the internal wall of the mold. Each mold half at its top neck carries a sealing member comprising a first insert, which is a shear insert, in the form of an approximately flat one-half ring to sever the parison against the blow pin; a second insert, which is a seal insert, in the form of a flat approximately one-half ring, to seal the parison against the blow pin; and a base member, in the form of an approximately one-half ring, having an inverted shelf to locate and support the shear and seal inserts.

REFERENCES:
patent: 3470582 (1969-10-01), Martin, Jr.
patent: 3806587 (1974-04-01), Turner
patent: 3869237 (1975-03-01), Hellmer et al.

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