Abstract
Measurements of spinning stress on filaments and birefringence of filaments in high speed melt spinning are reported. The air drag and the inertia contributions to the spinning stress are dominant factors in high speed spinning. The inertial stress plays an important role in the formation of fiber structure, since the air drag causes small effect on its formation. Linear relationships between the inertial stress and the birefringence of fibers were found in many polymers, namely, polyesters, polyolefins and nylons. The extent of slopes in such linear relations is associated with the crystallization mechanisms and the resulting fiber morphology.
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