Melt-spinning apparatus for polyester filaments

Details Melt-spinning apparatus for polyester filaments Melt-spinning apparatus for polyester filaments

1985-01-25

1986-08-12

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425464, B29D 720

Patent

active

046053646

ABSTRACT:
A melt-spinning apparatus 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). The apparatus comprises a spinneret having concentric rows of orifices and a centrally located quench means, with the diameter, d.sub.1, of the orifices in the row closest to the quench means being greater than the diameter, d.sub.2, of the orifices in the row furtherest from the quench means by an amount such that d1/d2 is in the range from 1.03 to 1.20.

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