Patent ID: 6054078
Filing Date: 2000-04-25
Classification: B29C,B32B,Y10T

Abstract:
A method for mass producing multilayer foamed thermoplastic or elastomeric members or profiles having at least two layers in intimate bonded interengagement with each other, said method comprising the steps ofA. extruding a foamed core member;B. cooling the extruded foamed core member;C. passing the core member through a cross head extrusion die for applying an outer layer to the surface of said core member;D. heating the surface of the core member to a temperature approaching the melting point of the core member prior to applying the outer layer thereto;E. applying a molten plastic coating to the heated surface of the core member for peripherally surrounding and substantially enveloping the core member with the molten plastic material maintained at a temperature above the melting point of the core member;F. releasing gases from the cells of the core member by said foregoing heating steps;G. removing the released gases; andH. allowing the coated core member to cool, thereby producing a core member having an outer layer peripherally surrounding said core member in integral, bonded interengagement therewith.