Increasing the spinning stability of acrylic fibres

Abstract

There are two regions of elevated spinning stability separated by a region of unstable jet formation caused by deformation resonance on the spinning stability curves characterizing the maximum deformation of the jets on the distance to their solidification point. Increasing the concentration of solvent (DMAA) in the spinning bath increases the distance to the solidification point and greater expansion of the jet, intensifying the deformation resonance, detected by an increase in the nonuniformity of the linear density of the filaments. With a concentration of solvent of 80% and higher, the solidification point is so far from the spinneret that it does not affect jet expansion; the deformation resonance phenomenon disappears, manifested by an increase in the deformability of the jet and a decrease in the nonuniformity of the linear density of the filaments. Increasing the spinning bath temperature moves the solidification point closer to the spinneret and suppresses deformation resonance, which also increases the deformability of the jet and decreases the nonuniformity of the linear density of the filaments.