The effects of MW

MWD

winding speed and other spinning conditions on the texture formation of PP fibers were studied. The experimental results show that the resins of lower MW and narrower MWD can be spun nicely up to a speed of 5300 m/min. A gradual transition from smectic to a-crystalline structure of the as-spun fibers with increasing spinning speed can be observed. The magnitude of the birefringence of the as-spun fibers in a-crystal-line modification is roughly in the order of increasing value of the index for c-axis orienta-tion. Thus

selection of suitable resin and processing parameters to controll the texture of fibers offer new route for high speed spinning of PP fibers to improve the mechanical pro-perties of end-use fiber products.