Analysis of the stability region of the process of spinning yarns based on aromatic polyamides

Conclusions -- For fibres based on aromatic polyamides at a constantv ₁/v ₀ ratio, the coefficient of jet expansion * remains practically unchanged with increase in flow rate, since thereupon the force of yarn tension rises considerably.-- As a result of analysis, a region of stable spinning has been determined by the ratio of the plasticized stretch and the tensions in the yarn in the region around the spinneret.-- The range of allowable change in parameters in the region of stable spinning depends on the viscosity of the starting polymer solution. This range diminishes with rise in viscosity.-- A procedure for analysis of spinning regimes has been proposed which permits one to estimate the maximum allowable rate of polymer solution outflow that ensures stability of the process at an assigned level of spinneret and plasticized stretches.Translated from Khimicheskie Volokna, No. 1, pp. 24–27, January–February, 1991.