Thermoforming flexible plastic foam shells

Details Thermoforming flexible plastic foam shells Thermoforming flexible plastic foam shells

1986-08-15

1988-04-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

219339, 219348, 264321, 425388, 425817R, B29C 6722, B29C 5118, B29C 5142, B29C 5136

Patent

active

047403420

ABSTRACT:
An improved method and apparatus for rapidly forming plastic foam shells from a flexible foam sheet. The foam sheet is intermittently passed through a radiant heating unit and is rapidly heated on both sides to 130.degree.-250.degree. F. to soften the foam. The heated foam sheet is immediately passed through a forming die unit in which the foam sheet is deformed partly into the die cavity by withdrawal of air from the cavity, and a die plug descends and final forms a shell while rapidly cooling the foam shell to below its plastic deformation temperature. By this forming method and apparatus, ethylene-containing foam shells having a depth 10-25 times the foam sheet initial thickness are rapidly formed at 10-30 cycles/minute.

REFERENCES:
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patent: 4102964 (1978-07-01), Ridgeway
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patent: 4248651 (1981-02-01), Kojimoto et al.
patent: 4360491 (1982-11-01), Holden, Jr.
patent: 4538787 (1985-09-01), Fox et al.

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