Extrusion of cellular thermoplastic material

Details Extrusion of cellular thermoplastic material Extrusion of cellular thermoplastic material

B - Operations, Transporting

29

C

18/665

B29C 47/64 (2006.01) B29C 44/32 (2006.01)

Patent

CA 1092311

METHOD AND APPARATUS FOR THE EXTRUSION OF CELLULAR THERMOPLASTIC MATERIAL ABSTRACT OF THE DISCLOSURE The invention provides method and apparatus for the production of cellular thermoplastic material compris- ing an extruder having a hollow barrel, screw means mounted in said barrel to advance material therethrough, mixer head means mounted in said barrel and gaseous blowing agent inlet means positioned in said barrel near the upstream end of said mixer head means, said mixer head means having in the surface thereof a plurality of alternate land and groove means, said land means having close clearance with the internal walls of said barrel near the upstream end there- of in the region of said blowing agent inlet means and alternately spaced and close clearance with said walls in the mixing region downstream of said blowing agent inlet means. S P E C I F I C A T I O N 1.

260150

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