Continuous process for manufacture of crosslinked, oriented polyethylene extrudates

摘要

High molecular weight polyethylene products of high strength, good thermal resistance and creep resistance process in which the polyethylene is melt drawn in a multiple-stage drawing process in which the polyethylene extrudate is treated sequentially by a first drawing process which uses an elongating draw at an elongation strain rate of from about 0.03 to 0.5 S-1, a subsequent stage of elongating draw at a lower elongational strain rate, whilst subjecting the extruded polyethylene to UV crosslinking during the subsequent stage of elongating draw at lower elongational strain rate.