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US 6,672,047 B2Granted
Processes of preparing partially oriented and draw textured poly(trimethylene terephthalate) yarns
AssigneeE. I. Du Pont de Nemours and Company
InventorsJames M. Howell, Joe Forrest 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.
Claims26
A process for continuous draw-texturing a partially oriented yarn made from a polymer substantially comprising poly(trimethylene terephthalate), comprising the steps of:
- (a) heating the yarn by passing it through a heater set to a temperature between about 160° C. and 200° C.;
- (b) 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
- (c) winding the yarn on a winder.
1 more element
Dependencies are inferred from the claim text.