Melt-spinning, drawing, relaxing, and winding polyesters

Details Melt-spinning, drawing, relaxing, and winding polyesters Melt-spinning, drawing, relaxing, and winding polyesters

D - Textiles, Paper

01

D

18/622

D01D 5/12 (2006.01) D01F 6/62 (2006.01)

Patent

CA 1085119

ABSTRACT OF THE DISCLOSURE A process is provided in which a continuous filament polyethylene terephthalate yarn having an HRV in the range of 24 to 28 in heated to a temperature in the range of 75° to 250°C. and drawn to a total denier in the range of 50 to 500 at a draw ratio in the range of 5.2:1 to 6:1, passed over a draw roll having a temperature in the range of 225° to 250°C., relaxed at a tension in the range of 0.09 to 0.15 gram per denier and would up at a minimum speed of 2,000 yards per min- ute (1829 meters/minute). The yarns prepared by this process have a tenacity in the range of 7.5 to 9 grams per denier, a load-bearing capacity in the range of 3 to 5 grams per denier at 7% elongation, a maximum dry heat shrinkage of 4% at 177°C. and an elongation at break in the range of 12 to 20%.

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