Process for extruding high molecular weight, high density...

Details Process for extruding high molecular weight, high density... Process for extruding high molecular weight, high density...

B - Operations, Transporting

29

C

190/150, 190/26,

B29C 47/06 (2006.01) B29C 49/22 (2006.01) B32B 27/32 (2006.01)

Patent

CA 1252966

Abstract A process is disclosed for extruding heavy tubular shaped articles from high molecular weight, high density linear ethylene polymers under shear- stress conditions such that the exterior surface of the extruded article would undergo melt fracture. Melt fracture is avoided by coextruding a thin layer of a second ethylene polymer in contact with the high molecular weight, high density linear ethylene polymer and the outer lip of the annular die. The second ethylene polymer has melt flow properties such that it does not exhibit melt fracture at the temperature and shear rate employed in extruding the tubular shaped article.

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