WERKWIJZE VOOR HET CONTINU VERVAARDIGEN VAN HOOG GESTREKTE POLYETHYLEENTEREFTALAAT-DRADEN.

摘要

A continuous spin-draw process is disclosed for preparing highly drawn polyethylene terephthalate filaments drawn at speeds greater than 1,800 meters per minute using only one heated draw roll system without the use of any other heating device. Feed and draw rolls are provided with a surface roughness which allows a slipping of the filaments along a number of turns before they leave the feed rolls and after they arrive at the draw rolls. The filaments are partially drawn at the lower temperature of the feed rolls, drawing continues between the feed and draw rolls, and is completed at the higher temperature of the draw rolls with a total draw ratio between 5 and 8.