FREMGANGSMAADE OG APPARAT TIL FREMSTILLING AF TERMOPLASTISKE SKUM

摘要

The invention provides a method of and apparatus for preparing a substantially uniform thermoplastic foam extruded from an extruder, the molten thermoplastic resin having uniformly distributed therein a foaming agent. A cooling-mixer (3) receives the extruded mass of resin and foaming agent from a supply extruder (1) and intimately mixes and substantially cools the mass. A substantially adiabatic zigzag mixer (5) is connected to the cooling-mixer and divides the mass into a plurality of separate streams which are at least partially separated and recombined. A die (61) is connected to the zigzag mixer and extrudes the uniformly cooled mass into a lower pressure zone to produce a substantially uniform thermoplastic foam.