PROCEDURE TO REDUCE THE FUSION FRACTURE FORMED DURING THE EXTRUSION OF A FUSED ETHYLENE POLYMER

摘要

A method for the extrusion of an ethylene polymer through a die (10) having a discharge outlet defining an exit die gap (18) formed by opposing die lip surfaces (20, 20 min ) 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 flow axis of the molten polymer through the die exit, whereby melt fracture is reduced on the surface of the polymer leaving the extended die lip surface.