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Measurements of the diameter, temperature, and birefringence of fibrous materials running from spinneret toward a winding machine during the melt spinning of polyethylene terephthalate (PET) were carried out. A specially designed spinning machine which enables us to measure the above variables was constructed. The measurements were carried out without touching the running fiber by employing various optical devices. Particularly, an infrared radiation microscope was employed successfully for the temperature measurement. Changes in observed diameter, temperature, and birefringenece and in calculated values of velocity and rate of deformation of the running fiber along the spinning line were similar to those reported by other authors. The thinning in the diameter of the running fiber seemed to be completed within a distance of two meters down from the spinneret. An estimation of the magnitude of the two components of dynamic loss compliance J" of PET, Ji" based on the recoverable viscoelastic deformation and JƒÅ" based on flow, was made for temperatures at different positions along the spinning line. The changes in the diameter and birefringence of the running fiber were explained qualitatively with the relative magnitude of Ji" and JƒÅ". In the zone below and close to the spinneret where

On the Change in Properties of Running Fibrous Materials in Melt Spinning