METHOD AND APPARATUS FOR IMPROVING THE CRIMPING OF POLYOLEFIN FILTER TOW

摘要

Polyolefin film is slit (13), molecularly oriented (14), fibrillated (15) and crimped (17). To improve the crimping, and thus the yield and variability as a filter, the fibrillated film is heated (16) before crimping. The fibrillated tow is crimped while still hot from the heating step. The resulting fibers have more uniform crimping at higher levels than those not subject to heating.