Method and apparatus for the continuous production of a uniform

Details Method and apparatus for the continuous production of a uniform Method and apparatus for the continuous production of a uniform

1981-07-14

1983-04-05

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 53, 264 87, 425 4C, 425 85, 425365, 425DIG60, B29D 2700, B29C 2900

Patent

active

043791077

ABSTRACT:
This invention is directed to an apparatus and method for producing a continuously molded thermoplastic sheet from heat expandable granules in a heated zone within a molding channel. The disclosed invention includes introducing a predetermined amount of water into the molding channel to wet the granules either prior to or contemporaneously with the introduction of a hot gas into the granules to expand the granules into a continuous thermoplastic sheet. The water is drained from the channel subsequent to the expansion of the granules.

REFERENCES:
patent: Re27964 (1974-04-01), Berner
patent: 3242238 (1966-03-01), Edberg et al.
patent: 3248461 (1966-04-01), Willes et al.
patent: 3253064 (1966-05-01), Buonaiuto
patent: 3427372 (1969-02-01), Berner
patent: 3856903 (1974-12-01), Schaeffer
Bender, Rene J. "Handbook of Foamed Plastics" Libertyville, Ill., Lake Publishing Corp., .COPYRGT.1965, pp. 10-11.

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