Closed circuit process for the production of expanded polystyren

Details Closed circuit process for the production of expanded polystyren Closed circuit process for the production of expanded polystyren

1986-06-09

1988-01-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

264 53, 264DIG9, 264DIG15, B29B 1700, C08J 922

Patent

active

047215887

ABSTRACT:
A closed circuit process for the production of expanded polystyrene foam is described, comprising the steps of: (a) pre-expanding raw polystyrene beads containing a blowing agent in a pre-expansion vessel; (b) storing the beads in one or more closed storage containers to allow the expanded beads to return to substantially atmospheric pressure; (c) molding the expanded beads to a desired configuration in a closed mold with steam; and (d) removing the thus-formed article from the mold and placing such in an aging room, wherein at each stage the blowing agent released from the beads is recovered, separated from any residual steam by means of a condensing system, and introduced into the burner of a steam generator, thereby serving as fuel for the process.

REFERENCES:
patent: 3268635 (1966-08-01), Kraus et al.
patent: 4272469 (1981-06-01), Smith

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