Abstract
The heat associated with drawing of poly(ethylene terephthalate) fiber is estimated on the basis of equations developed in the literature on films undergoing deformation by neck propagation. The deformation process is divided into two steps: neck propagation or drawing to the natural draw ratio and uniform deformation accompanied by crystallization. The results show that heat loss is negligible during deformation by necking and the temperature rise is estimated to be about 60K in yarns with a spun birefringence of 0.011. The heat released in step 2 is sufficient to raise the fiber temperature about 55K under adiabatic conditions, of free air convection, the temperature rise is estimated to be only about 5–1 0K.
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