Differential pressure synthetic plastic forming machine and meth

Details Differential pressure synthetic plastic forming machine and meth Differential pressure synthetic plastic forming machine and meth

1982-07-01

1984-08-07

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264550, 264553, 4253021, 425388, 4254031, B29C 1704, B29C 1708

Patent

active

044643292

ABSTRACT:
A differential pressure forming machine with upper and lower mold members for forming cup-like articles in a web of thermoplastic material includes a mold assembly in which two separable die members, when in their closed position cooperatively form an article defining mold cavity which extends through one member and into the other. The two die members, when opened, are spaced from each other by a distance greater than the depth of the formed article. An endless chain of carrier members is located with one run extending between the two die members. Each carrier member has an opening smaller than the circumference of the formed article. Closing of the die members expands the carrier member opening outwardly of the periphery of the die cavity and closing of the entire mold assembly in the forming operation effects a severing of the formed article from the web. Upon subsequent opening of the die, the carrier member opening contracts, gripping the formed article to convey it clear of the mold as the next carrier member in the chain is advanced with the web into operative relationship with the mold. At a collection station a discharge member operative with the plug assist of the forming machine removes the formed and separated article from the carrier member.

REFERENCES:
patent: 2531540 (1950-11-01), Smith
patent: 3346923 (1967-10-01), Brown et al.
patent: 3357053 (1967-12-01), Lyon et al.
patent: 4157888 (1979-06-01), Sikorski
patent: 4204824 (1980-05-01), Paradis

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