Melt-spinning polyester filaments

Details Melt-spinning polyester filaments Melt-spinning polyester filaments

D - Textiles, Paper

01

D

18/565

D01D 5/088 (2006.01) D01D 4/02 (2006.01) D01D 5/08 (2006.01)

Patent

CA 1206713

ABSTRACT A melt-extrusion process is disclosed for reducing the birefringence variability of melt-spun yarn made at high pack throughputs. It involves extruding polymer at an average mass-flow rate through a first group of orifices (defined by specific location in the spinnerette), that is greater than the mass-flow rate of polymer through a second group of orifices (also defined by location in the spinnerette). It is preferred that a spinnnerette be used in which the dimensions of the orifices differ from group to group in a defined manner.

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