AN APPARATUS FOR EXTRUDING LOW DENSITY LINEAR POLYOLEFIN MATERIALS HAVING HIGH VISCOSITIES

摘要

A method is disclosed for the extrusion of low-density linear polyolefin materials having high viscosities, wherein such materials are continuously fed to and through a rotary extruder having feeding, transition and metering sections which comprises employing, in the extruder screw forming such sections in cooperation with the cylindrical interior of the extruder housing, opened leading edges for the screw flights of said sections; and gall-resistant coated surfaces on the screw flights of said sections.