Abstract:

In order to improve the spinnability of polyoxymethylene (POM) fibers, the melt spinning temperature of POM was determined by studying the rheological behavior and thermal stability of POM resin. The isothermal crystallization ability of POM resin was studied to determine the ultra high thermal draw temperature of the primary fibers of POM, and the effects of winding speed, thermal drawing ratio and heat setting conditions on the crystallinity, orientation and mechanical properties of POM fibers were studied. The results show that the optimum melt spinning temperature of POM is 215 ℃, and the orientation, crystallinity and mechanical properties of POM fibers increase with the increase of winding speed. The optimum thermal drawing temperature of the primary of the primary fibers of POM is 155℃, and the limit drawing ratio of the thermal drawing can reach 17 times. At this time, the fracture strength of the POM fibers is 8.87 cN/dtex, and the initial modulus is 108.07 cN/dtex. Afer drawing the crystallinity and orientationof the POM fibers are increased, and the mechanical properties of the POM fibers increase with the increase of draw ratio. The optimum heat setting temperature is 145 ℃ and the heat setting time is 40~50 s.

Key words: polyoxymethylene fiber, melt spinning, ultrahigh-rate drawing, spinnability