Method for reducing melt fracture during extrusion of ethylene p

Details Method for reducing melt fracture during extrusion of ethylene p Method for reducing melt fracture during extrusion of ethylene p

1979-01-08

1981-05-12

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264176R, 264177R, 425376R, 425381, 425461, B29D 2304

Patent

active

042671469

ABSTRACT:
A method for reducing the melt fracture during extrusion of a molten narrow molecular weight distribution ethylene polymer which comprises extruding said polymer through a die having a die gap greater than about 50 mils and wherein at least a portion of one surface of the die lip and/or die land in contact with the molten polymer is at an angle of divergence or convergence relative to the axis of flow of the molten polymer through the die.

REFERENCES:
patent: 3376605 (1968-04-01), Beattie
patent: 3382535 (1968-05-01), Ferrari
patent: 3874837 (1975-04-01), Jamieson
patent: 3879507 (1975-04-01), Cavanna
patent: 3914366 (1975-10-01), Wilson
patent: 3920782 (1975-11-01), Cogswell
patent: 3994654 (1976-11-01), Chyu

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