Stretch polyester/cotton spun yarn
AssigneeInvista North America S.A.R.L.
InventorsGeoffrey Hietpas, Steven Smith
Life of this patent
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Abstract
The invention provides a bicomponent polyester staple fiber and a spun yarn comprising cotton and a bicomponent polyester staple. The fiber of the invention exhibits unexpectedly good crimp and cardability properties, and the yarn has unusually high stretch characteristics and excellent uniformity.
Claims15
A spun yarn having a total boil-off shrinkage of at least about 22% comprising cotton and a bicomponent staple fiber comprising poly(ethylene terephthalate) and poly(trimethylene terephthalate) said bicomponent staple fiber having:
- a tow crimp development value of about 35% to about 70%;
- a tow crimp index value of about 14% to about 45%;
- a length of about 1.3 cm to about 5.5 cm;
- and
- a linear density of about 0.7 decitex per fiber to about 3.0 decitex per fiber;
- wherein the bicomponent staple fiber is present at a level of about 20 wt %, to about 65 wt %, based on total weight of the spun yarn;
- and
- wherein the cotton is present at a level of about 35 wt % to about 80 wt %, based on total weight of the spun yarn.
A bicomponent staple fiber comprising poly(ethylene terephthalate) and poly(trimethylene terephthalate) and having a tow crimp development value of about 40% to about 60% and a tow crimp index value of about 14% to about 27%, wherein the difference between the crimp index and the crimp development values is about 24% to about 35% absolute.
A woven fabric comprising at least about 18% available stretch in at least a first direction and less than about 5% growth in at least said first direction, wherein the fabric consists essentially of staple fiber yarns in at least said first direction.
A woven fabric comprising at least about 18% available stretch in at least a first direction and less than about 5% growth in at least said first direction, wherein the fabric consists of staple fiber yarns in at least said first direction, and wherein the staple fiber yarns comprise poly(ethylene terephthalate) and polytrimethylene terephthalate) bicomponent staple fiber.
A woven fabric comprising at least about 18% available stretch in at least a first direction and less than about 5% growth in at least said first direction, wherein the fabric consists of staple fiber yarns in at least said first direction, and wherein the staple fiber yarns comprise poly(ethylene terephthalate) and polytrimethylene terephthalate) bicomponent staple fiber, the staple fiber having length of about 1.3 cm to about 5.5 cm and linear density of about 0.7 decitex per fiber to about 3.0 decitex per fiber.
Dependencies are inferred from the claim text.