Numerical computations of the fundamental equations for dry spinning were carried out for various spinning conditions of polyurethane-urea elastomers. Steady-state solutions obtained give the spinline cross sectional area, spinline temperature, spinning tension, spinline deflection and solvent concentration profile within a filament. These are described as a function of the distance measured downward from the spinneret. Dry spinning experiments were conducted for the binary component system of polyurethane-urea and dimethylfomamide solvent. The spinning variables were changed mainly in terms of throughout, take-up speed, ambient temperature and so on. Good linear correlations between theory and experiment were obtained for the solvent concentration in a filament and the spinline deflection. On the other hand, tensile tests and molecular orientation measurements for as-spun fibers were carried out to obtain a relationship of the fiber properties to the output variables from computations. The stresses at the 100% and 300% elongations in the stress-strain curves, respectively, were found to become large proportionally with increase of the calculated stresses at the take-up point. This may be related to the molecular orientation of as-spun fibers, especially the orientation of hard segments. It was found that the simulation program of dry spinning is very useful in finding
Journal of Polymer Engineering – de Gruyter
Published: Dec 1, 1986
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