Method for melt spinning polyester filaments

Details Method for melt spinning polyester filaments Method for melt spinning polyester filaments

1982-09-23

1985-04-30

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

425 72S, 425464, B29F 304

Patent

active

045143501

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 spinnerette be used in which the dimensions of the orifices differ from group to group in a defined manner.

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