Method for forming container having re-entrant flange

Details Method for forming container having re-entrant flange Method for forming container having re-entrant flange

1982-08-09

1985-01-22

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264318, 264544, 425388, B29C 1704

Patent

active

044951353

ABSTRACT:
A unitary, thermoformed container having an undercut or re-entrant seal flange is provided. The container is made in a molding method and apparatus in which a flange-forming portion thereof has a short-stroke gate assembly that opens after the unitary, thermoformed container has been formed in order to provide an exit path away from the molding cavity to permit ready removal of the thermoformed container out of the molding cavity and its flange-forming portion.

REFERENCES:
patent: 2335260 (1943-11-01), Chamberlain
patent: 2962758 (1960-12-01), Politis
patent: 3058153 (1962-10-01), Busch
patent: 3126582 (1964-03-01), Scott
patent: 3235165 (1966-02-01), Jackson
patent: 3394861 (1968-07-01), Truax
patent: 3640668 (1972-02-01), Brown et al.
patent: 3749276 (1973-07-01), Davis
patent: 4101256 (1978-07-01), White et al.
patent: 4123495 (1978-10-01), Abey

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