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US 6,648,926 B1Granted
Process for treating knits containing polyester bicomponent fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert Francis Immediato
Life of this patent
Estimating the term…
Abstract
A process for improving the properties of knit fabrics containing bicomponent polyester fibers, by heat-setting the fabrics, while stretched cross-directionally, prior to dyeing, is provided.
Claims6
A process for treating a knit fabric comprising a plurality of self-crimping bicomponent fibers comprised of poly (ethylene terephthalate) and poly (trimethylene terephthalate), and having a crimp contraction value (CCa) of at least about 10%, comprising the steps of:
- (a) stretching the fabric cross-directionally by about 1-15% based on the dry width of the fabric;
- (b) heat-setting the stretched fabric by dry heat-setting at a temperature of about 160-177° C. for a period of about 20-60 seconds or steam heat-setting at a temperature of about 120-145° C. for a period of about 3-40 seconds;
- (c) dyeing the heat-setted fabric;
- and
- (d) drying the fabric at a temperature no higher than about 145° C.
2 more elements
Dependencies are inferred from the claim text.