Supermicrocellular foamed materials

  • US RE37,932 E1
  • Filed: 08/02/1996
  • Issued: 12/10/2002
  • Est. Priority Date: 04/05/1991
  • Status: Expired due to Term
First Claim
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1. A system for producing a foamed material comprisingextrusion means means connected to said extrusion means for supplying a material to be foamed to said extrusion means;

  • die means for shaping material;

    said extrusion means connected to said die means for providing extruded material to said die means;

    means for heating and extrusion means to cause said extrusion means to provide said extruded material at a higher temperature than room temperature to permit said die means to produce shaped continuous heated material;

    means for engaging and transporting said shaped continuous heated material through an enclosed volume;

    means connected to said enclosed volume for supplying supercritical fluid to said enclosed volume to introduce said supercritical fluid into said shaped continuous heated material at a higher pressure than atmospheric pressure;

    means for retaining said shaped continuous heated material within said enclosed volume for a sufficient client time period to permit said supercritical fluid to saturate said shaped continuous heated material;

    means for removing said shaped continuous heated material saturated with said supercritical fluid from said enclosed volume at a pressure which is less than said higher pressure; and

    foam heating means for heating said material which has been removed from said enclosed volume so as to produce shaped continuous heated foamed material having a plurality of cells distributed substantially throughout said foamed material.

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