Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1981-04-01
1982-11-23
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, 2642091, 2642098, 264216, 4253261, 425380, 425461, 425467, 526124, 526125, B29D 2304
Patent
active
043604943
ABSTRACT:
A process for reducing melt fracture formed during extrusion of a molten narrow molecular weight distribution, linear, ethylene polymer, which comprises extruding said polymer through a die having a discharge outlet defining an exit die gap formed by opposing die lip surfaces and wherein one surface of the die lip and/or die land in contact with the molten polymer extends beyond the opposing surface of the die lip and/or die land in the direction of the axis of flow of the molten polymer through the die exit and wherein said extended die lip has a groove extending around said extended die lip, said groove being disposed opposite the leading edge of the opposing die lip surface whereby melt fracture is reduced on both surfaces of the polymer leaving said die exit.
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Thurlow Jeffery R.
Union Carbide Corporation
Vicari Clement J.
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