D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/599
D01F 6/60 (2006.01) D01D 5/06 (2006.01) D01D 5/14 (2006.01)
Patent
CA 2037448
TITLE Process for Spinning High-Strength, High-Modulus Aromatic Polyamides ABSTRACT A process for spinning high-strength, high-modulus, aromatic polyamide filaments is disclosed in which an acid solution containing at least 30 g per 100 ml acid of aromatic polyamide having an inherent viscosity of at least 4 and chain extending bonds which are either coaxial or parallel and oppositely directed is extruded through a layer of inert noncoagulating fluid into a coagulating bath and then through a spin tube along with overflowing coagulating liquid. Additional coagulating liquid is jetted symmetrically about the filaments in a downward direction forming an angle of 0°C to 85° with respect to the filaments within about 2.0 milliseconds from the time the filaments enter the spin tube. The flow rates of the jetted and the overflowing coagulating liquids are maintained constant. In the process, the mass-flow ratio, i.e., the ratio of the mass-flow rate of combined coagulating liquid to mass-flow rate of the filaments, greater than about 250, preferably greater than about 300, and the momentum ratio of jetted to overflowing coagulating liquids of greater than about 6.0 is employed. Also, the average linear velocity of combined coagulating liquids in the spin tube is less than the velocity of the filaments exiting from the spin tube. Doc. P.12 KB-3380
Chiou Minshon J.
Chiou Minshon J.
E. I. Du Pont de Nemours And Company
Sim & Mcburney
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