Polymer foam thermoformation process and apparatus therefor

Details Polymer foam thermoformation process and apparatus therefor Polymer foam thermoformation process and apparatus therefor

1983-04-28

1984-11-27

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

34155, 264321, 264322, 264DIG15, 264DIG65, 425384, 425817C, 425DIG39, 432 59, B29D 2700

Patent

active

044850590

ABSTRACT:
A method of thermoforming comprising providing a continuous sheet of thermoplastic polymeric foam, transporting said sheet through an atmosphere of at least predominantly steam at a temperature of at least 215.degree. F. maintaining said sheet in said atmosphere for a time sufficient to cause a decrease in the density thereof; thereafter while under the influence of said temperature, deforming at least a portion of said sheet to a predetermined shape and while so deformed, cooling the same to cause retention of said shape and a system for carrying out said method.

REFERENCES:
patent: 3189399 (1965-06-01), Jacobs et al.
patent: 3200437 (1965-08-01), Sasanko
patent: 3359600 (1967-12-01), O'Brien et al.
patent: 3518334 (1970-06-01), Carrigan et al.
patent: 3830611 (1974-08-01), Irwin
patent: 4056587 (1977-11-01), Honkanen et al.
patent: 4302415 (1981-11-01), Lake
Plastics Technology, Apr. 1980, pp. 19 and 20, "Process Engineering _News", In-Line Process Makes Laminated Paper/PS Foam Board, Section: _The Post Expander: Heart of the System.

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