Patent ID: 6165300
Filing Date: 2000-12-26
Classification: B29C,B29K

Abstract:
A method for manufacturing an at least two-layered composite body having a support layer consisting primarily of a microwave-permeable polymer and having a porous layer made from an expanded microwave absorbing polymer, the method comprising the steps of:a) treating a microwave absorbing thermoplastic polymer with a foaming agent;b) expanding the microwave absorbing thermoplastic polymer solely through irradiation with microwaves under decomposition or evaporation of the foaming agent to create the porous layer;c) melting a microwave-permeable thermoplastic polymer adjacent to the microwave absorbing thermoplastic polymer in a border region of the composite body using microwaves via heat conduction out of the microwave absorbing thermoplastic polymer;d) melting said microwave absorbing thermoplastic polymer in said border region using microwaves; ande) cooling the microwave absorbing thermoplastic polymer and the microwave-permeable thermoplastic polymer to weld together the support layer and the porous layer.