THERMOPLASTIC ELONGATED CELLULAR PRODUCTS
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Abstract
INTEGRAL FOAM OBJECTS COMPOSED OF A PLURALITY OF FUSED STRANDS HAVING A DENSITY OF 4 POUNDS PER CUBIC FOOT OR LESS ARE PREPARED BY EXTRUDING A FOAMABLE THERMOPLASTIC MATERIAL THROUGH A MULTI-ORIFICE DIE PLATE WHEREBY THE INDIVIDUAL FOAMABLE ELEMENTS IN STRAND FORM ARE SIMULTANEOUSLY EXPANDED AND FUSED OR COALESCED UPON EMERGING FROM THE DIE ORIFICES. PRODUCTS OF ANY DESIRED CONFIGURATION MAY BE PRODUCED BY PLACING A SUITABLE FORMER ADJACENT TO THE DIE. THESE FOAMABLE THERMOPLASTIC PRODUCTS MAY BE POLYSTYRENE, POLYETHYLENE, OR ANY OF THE KNOWN THERMOPLASTICS INTO WHICH A NON-SOLVENT BLOWING OR EXPANDING AGENT IS INCORPORATED PRIOR TO EXTRUSION.
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