STRETCH YARNS AND FABRICS WITH MULTIPLE ELASTIC YARNS
Included herein is an articles and methods including a core spun yarn. The core spun yarn includes a sheath of hard fibers and two sets of elastic fibers wherein the sets of elastic fibers have different properties. The properties may differ in one or more ways such as having a different denier, composition or draft. One or both of the sets of elastic fibers can be precovered.
1 . An article comprising a core spun yarn comprising:
a) a sheath of hard fibers;
b) one set of elastic fiber (elastic core fiber I); and
c) a second set of elastic fiber (elastic core fiber II);
wherein the elastic core fiber I and the elastic core fiber II have different elastic properties.
2 . The article of claim 1 , wherein the elastic core fiber I and elastic core fiber II have different deniers or different filaments.
3 . The article of claim 1 , wherein the elastic core fiber I and elastic core fiber II have different drafts.
4 . The article of claim 1 , wherein the elastic core fiber I and elastic core fiber II have different polymer compositions.
5 . The article of claim 1 , wherein at least one elastic core fiber comprises elastomeric fiber having denier of about 10 denier to about 450 denier.
6 . The article of claim 5 , wherein at least one elastic core fiber comprises spandex fiber.
7 . The article of claim 1 , wherein at least one elastic core fiber comprises elastic polyolefin fiber having denier of about 10 denier to about 450 denier.
8 . The article of claim 7 , wherein the elastic polyolefin fiber is lastol fiber.
9 . The article of claim 1 , wherein at least one set of elastic core yarns are pre-covered elastic yarn having denier of about 15 denier to about 300 denier.
10 . The article of claim 9 , wherein the pre-covered elastic yarns include a covering selected from the group of air covered yarn, single wrapped yarn, double wrapped yarn, and combinations thereof.
11 . The article of claim 9 , wherein the pre-covered elastic yarn is a polyester and spandex air covered yarn.
12 . The article of claim 1 , wherein at least one elastic core fiber includes a non-elastomeric elastic fiber having a denier of about 15 to about 450 denier.
13 . The article of claim 12 , wherein the non-elastomeric elastic yarn is selected from the group of filaments with yarn recoverable stretch higher than 20% tested with ASTM D6720-07 method
14 . The article of claim 13 wherein said non-elastomeric elastic yarn comprises at least one fiber selected from the group consisting of polyester, nylon, PTT fiber, PBT fiber, bi-component fiber, and combinations thereof.
15 . The article of claim 1 , wherein the sheath of hard fibers is selected from the group consisting of wool, linen, silk, polyester, nylon, olefin, cotton, and combinations thereof.
16 . An article comprising a woven fabric having warp yarns and weft yarns, wherein at least one of the warp yarns and weft yarns includes a core spun yarn comprising:
a) a sheath of hard fibers;
b) one set of elastic fiber (elastic core fiber I); and
c) a second set of elastic fiber (elastic core fiber II);
wherein the elastic core fiber I and the elastic core fiber II have different elastic properties.
17 . The article of claim 16 , wherein the fabric has stretch in the weft direction between about 10 and about 45%.
18 . The article of claim 16 , wherein said fabric comprises a garment.
19 . A method of making an article comprising a woven fabric having warp yarns and weft yarns. Either warp yarn or weft yarn or both warp and weft yarns have core spun yarn, wherein, the core spun yarn comprising:
a) a sheath of hard fibers;
b) one set of elastic fiber (elastic core fiber I); and
c) a second set of elastic fiber (elastic core fiber II);
wherein the elastic core fiber I and the elastic core fiber II have different elastic properties.
20 . A stretch fabric comprising a core spun yarn comprising:
a) a sheath of hard fibers;
b) one set of elastic fiber (elastic core fiber I); and
c) a second set of elastic fiber (elastic core fiber II);
wherein the elastic core fiber I and the elastic core fiber II have different elastic properties.
21 . The article of claim 20 , wherein the fabric is woven, or warp knit, or circular knit fabric.