Process for extruding high molecular weight, high density linear

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

1985-06-11

1986-11-11

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264515, 264173, 4251311, 4251331, B29C 4706, B29C 4904

Patent

active

046221999

ABSTRACT:
A process is disclosed for extruding heavy tubular shaped articles from high molecular weight, high density linear ethylene polymers under shearstress 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.

REFERENCES:
patent: 3892828 (1975-07-01), Weatherly et al.
patent: 3949042 (1976-04-01), Utz
patent: 3980744 (1976-09-01), Cogswell
patent: 4289727 (1981-09-01), Herrington, Jr.
patent: 4327053 (1982-04-01), Cogswell et al.
patent: 4364981 (1982-12-01), Horner et al.

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