Method of producing a foamed, molded article
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United States of America Patent
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Feb 21, 1989
Grant Date -
N/A
app pub date -
Apr 10, 1987
filing date -
Apr 15, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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