Effects of Process Technology on Structure and Properties of HMLS Fibers

High modulus low shrinkage (HMLS) fibers have been prepared by using higher viscosity PET chips. The effects of the process conditions on their structure and properties have been studied by various testing techniques. The results show that the suitable spuming speed for preparing of HMLS fibers is 2 000 - 2 800 m/ min. With the increase of the spinning speed, the density, crystallinity, and birefringence of the initial fibers increase obviously, but the shrinkage ratio decreases rapidly. The effects of process technology on properties of the HMLS fibers have also been discussed.