Process for nylon 66 yarn having a soft hand
AssigneeMonsanto Company
InventorsJames E. Bromley, Michael M. McNamara, Wayne T. Mowe
Life of this patent
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Abstract
Nylon 66 yarn having particular stress-strain properties, typically also having a soft, luxuriant hand in fabric form. As compared to conventional nylon 66 with comparable boiling water shrinkage, the novel yarn exhibits a higher modulus at break, a lower modulus at 10% elongation, a positive stress index, and excellent denier uniformity. The process involves subjecting the yarn, within 0.016 to 0.11 seconds after solidification of the filaments, to a tension of 0.2 and 1.5 grams per final denier and heating the yarn to a temperature between 50.degree. and 250.degree. C. long enough to reduce yarn retraction below 1%.
Claims6
A process of melt spinning nylon 66, comprising:
- a. extruding nylon 66 polymer of fiber-forming molecular weight as a plurality of molten streams,
- b. solidifying said streams into solid filaments while withdrawing said filaments from said streams at a sufficiently high speed to provide a tension within the range between 0.2 and 1.5 grams per final denier;
- c. maintaining said filaments under tension within said range while forwarding said filaments at least 0.016 and less than 0.11 seconds after solidification to a treatment zone wherein said filaments are heated to between 50.degree. C. and 250.degree. C. for a period sufficient to reduce the yarn retraction to less than 1%;
- and
- d. withdrawing said filaments from said treatment zone.
A process of melt spinning nylon 66, comprising:
- a. extruding nylon 66 polymer of fiber forming molecular weight as a plurality of molten streams,
- b. solidifying said streams into solid filaments while withdrawing said filaments from said molten streams at a speed sufficient to produce a final spun yarn having a Hermann's orientation function Fc of at least 0.78 and
- c. maintaining said filaments under a tension of 0.2 and 1.5 grams per final denier while forwarding said filaments at least 0.016 and less than 0.11 seconds after solidification to a treatment zone wherein said filaments are heated to between 50.degree. C. and 250.degree. C. for a period sufficient to reduce the yarn retraction to less than 1%;
- and
- d. winding said filaments on a bobbin.
A process of melt spinning nylon 66, comprising:
- a. extruding nylon 66 polymer of fiber forming molecular weight as a plurality of molten streams,
- b. solidifying said streams into solid filaments while withdrawing said filaments from said molten streams at a speed sufficient to produce a final spun yarn having a Hermann's orientation function Fc of at least 0.85, and
- c. maintaining said filaments under a tension of 0.2 and 1.5 grams per final denier while forwarding said filaments at least 0.016 and less than 0.11 seconds after solidification to a treatment zone wherein said filaments are heated to between 50.degree. C. and 250.degree. C. for a period sufficient to reduce the yarn retraction to less than 1%;
- and
- d. winding said filaments on a bobbin.
A process of melt spinning nylon 66, comprising:
- a. extruding nylon 66 polymer of fiber forming molecular weight as a plurality of molten streams;
- d. solidifying said streams into solid filaments while withdrawing said filaments from said molten streams at a speed sufficient to produce a final spun yarn having a crystallite hydrogen bonded sheet width no greater than 85% of the crystallite hydrogen bonded sheet width of a reference spun yarn sample, and
- c. maintaining said filaments under a tension of 0.2 and 1.5 grams per final denier while forwarding said filaments at least 0.016 and less than 0.11 seconds after solidification to a treatment zone wherein said filaments are heated to between 50.degree. C. and 250.degree. C. for a period sufficient to reduce the yarn retraction to less than 1%;
- and
- d. winding said filaments on a bobbin.
A process of melt spinning nylon 66, comprising:
- a. extruding nylon 66 polymer of fiber forming molecular weight as a plurality of molten streams,
- b. solidifying said streams into solid filaments while withdrawing said filaments from said molten streams at a speed sufficient to produce a final spun yarn having a crystallite hydrogen bonded sheet width no greater than 75% of the crystallite hydrogen bonded sheet width of a reference spun yarn sample, and
- c. maintaining said filaments under a tension of 0.2 and 1.5 grams per final denier while forwarding said filaments at least 0.016 and less than 0.11 seconds after solidification to a treatment zone wherein said filaments are heated to between 50.degree. C. and 250.degree. C. for a period sufficient to reduce the yarn retraction to less than 1%;
- and
- d. winding said filaments on a bobbin.
Dependencies are inferred from the claim text.