Process for dimensionally stable polyester yarn

Details Process for dimensionally stable polyester yarn Process for dimensionally stable polyester yarn

D - Textiles, Paper

01

F

18/622

D01F 6/62 (2006.01) D01D 5/08 (2006.01)

Patent

CA 2004942

The invention is directed to a process for production of a dimensionally stable drawn polyethylene terephthalate multifilament yarn having filaments of at least 2.5 denier per filament comprising the steps of: a) extruding a polyethylene terephthalate polymer melt through a spinnerette having a plurality of extrusion orifices to form filaments; b) advancing the extruded multifilament yarn first through a delay zone then through a quenching zone to solidify the filaments in a controlled manner; c) withdrawing the solidified multifilament yarn from the quenching zone at a desired spinning speed V; whereby steps a) through c) are performed under conditions to form a partially-oriented multifilament yarn having a undrawn birefringence (.DELTA.n u) of at least 0.020 and wherein .DELTA.n u = R f V2.0 IV2.4 where IV is the intrinsic viscosity of the undrawn yarn and is at least 0.80 and R f is at least 9.0 x 10-3; then d) hot drawing the partially-oriented multifilament yarn. The process permits production of high undrawn birefringence yarns at lower speeds and lower IV's than previously demonstrated in the prior art.

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