Patent ID: 8419989
Filing Date: 2013-04-16
Classification: B29C,D01D,D01F

Abstract:
1. A process for spinning polymer filaments comprising: a) extruding a polymer solution to form one or more dope filaments into an air gap above a liquid coagulation bath having a quench tube and containing a coagulation liquid, where the dope filaments are subject to strain; b) introducing the dope filaments into the liquid coagulation bath; c) forming a downward stream of liquid and coagulated filaments; through the quench tube; d) contacting the liquid with a surface after the exit of the quench tube and prior to separating the liquid from the coagulated filaments, such that the downward force of gravity on the liquid does not increase the strain on the dope filaments in the air gap, and wherein the coagulated filaments are coupled with the liquid in contact with the surface to increase fluid exchange; and e) separating the liquid from the coagulated filaments.