Method of producing a foamed, molded article

Details Method of producing a foamed, molded article Method of producing a foamed, molded article

1987-04-10

1989-02-21

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 51, 264 55, B29C 6722

Patent

active

048062936

ABSTRACT:
Method of producing a molded article of a foamed thermoplastic resin. A molten mass of an expandable thermoplastic resin is accumulated in an accumulator while it is prevented from foaming. A predetermined quantity of the accumulated thermoplastic resin is ejected rapidly from the accumulator into the atmosphere so that the thermoplastic resin commences foaming. The ejected thermoplastic resin is placed in a mold cavity before the foaming expansion has been completed and is compressed. The expansion and molding of the ejected thermoplastic resin is completed in the mold while controlling the compression pressure to obtain a foamed molded article.

REFERENCES:
patent: 3268636 (1966-08-01), Angell
patent: 3812225 (1974-05-01), Hosoda et al.
patent: 4323528 (1982-04-01), Collins
patent: 4397797 (1983-08-01), Nojiri et al.
patent: 4456571 (1984-06-01), Johnson
patent: 4524037 (1985-06-01), Marc

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