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OBTAINING THE CRITICAL DRAW RATIO OF DRAW RESONANCE IN MELT SPINING FOR POWER LAW POLYMER FLUIDS

Jinan Cao

Industrial Research Institute Swinburne, Swinburne University of Technology, P.O. Box 218 Hawthorn, Victoria 3122, Australia

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Abstract

A direct difference method has been developed for Non-Newtonian power law fluids to solve the simultaneous non-linear partial differential equations of melt spinning, and to determine the critical draw ratio for draw resonance. The results show that for shear thin fluids, the logarithm of the critical draw ratio has a well defined linear relationship with the power index for isothermal and uniform tension melt spinning. When the power index approaches zero, the critical draw ratio points at unity, indicating no melt spinning can be processed stably for such fluids. For shear thick fluids, the critical draw ratio increases in a more rapid way with increasing the power index.

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