Method for producing foamed, molded thermoplastic articles
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United States of America Patent
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Apr 13, 1993
Grant Date -
N/A
app pub date -
Apr 23, 1991
filing date -
Apr 23, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
Method and apparatus for producing a molded article of a foamed thermoplastic resin and articles produced thereby. A molten mass of an expandable thermoplastic resin is accumulated in an accumulator while it is prevented from foaming. A quantity of the accumulated foamable melt is extruded through a die orifice having a shape adapted to reflect the shape of the desired finished product. The extruded foamable melt commences foaming as it comes in contact with the atmosphere. As the extruded thermoplastic resin foams, it is pulled vertically downward from the die orifice by gravity. The downward-hanging, foamed, thermoplastic material is captured between the halves of a vertically-oriented mold before the foaming expansion of the foamable melt has been completed. The foamed thermoplastic material is compressed by the vertically-oriented mold into the desired shape. The foamed thermoplastic material may be formed to intricate articulations within the female mold portion by gases emitted from jets in the male mold portion or by venting or drawing off gases disposed in the female mold portion. The mold halves may also be configured to confine any foamed resin flash to the bottom portion of the molded article.
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