Method and apparatus for preparing thermoplastic foams

Details Method and apparatus for preparing thermoplastic foams Method and apparatus for preparing thermoplastic foams

B - Operations, Transporting

29

C

18/662

B29C 47/36 (2006.01) B01F 5/06 (2006.01) B01F 13/10 (2006.01) B01F 15/00 (2006.01) B29C 44/34 (2006.01)

Patent

CA 1179812

ABSTRACT OF THE DISCLOSURE: A method 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 continuously receives the extruded mass of resin and foaming agent from the extruder and intimately mixes and substantially cools the mass. A substan- tially adiabetic zigzag mixer 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 is connec- ted to the zigzag mixer and extrudes the uniformly cooled mass into a lower pressure zone to produce a substantially uniform thermoplastic foam.

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