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US 6,333,106 B2Granted
Draw textured poly(trimethylene terephthalate) yarn
AssigneeE. I. Du Pont de Nemours and Company
InventorsJames M Howell, Joe F London, Jr., Michelle H Watkins
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Abstract
A stable partially oriented poly(trimethylene terephthalate) yarn suitable for use in subsequent drawing and/or draw-texturing operations characterized by an elongation to break of at least 110%, and a process for false-twist texturing a partially oriented poly(trimethylene terephthalate) yarn are disclosed.
Claims19
A draw textured yarn made by continuous draw-texturing a partially oriented feed yarn with the following steps:
- (a) providing a partially oriented feed yarn made from a polyester polymer, wherein (i) said polymer comprises at least 85 mole % poly(trimethylene terephthalate) wherein at least 85 mole % of repeating units consist of trimethylene units, (ii) the polymer has an intrinsic viscosity of at least 0.70 dl/g, and (iii) the partially oriented yarn has an elongation to break of 110-137.1%;
- (b) heating the partially oriented feed yarn in a heater set to a temperature between about 160° C. and 200 °C.;
- (c) twisting the yarn using a twist insertion device such that in a region between the twist insertion device and up to and including the heater, the yarn has a twist angle of about 46 degrees to about 52 degrees;
- and
- (d) winding the yarn on a winder.
2 more elements
Dependencies are inferred from the claim text.