Core spun yarn and woven stretch fabric

Abstract

A core spun yarn comprising a bi-component polyester filament and an elastomeric fiber. The polyester filament has a denier from about 20 to about 150 and the elastomeric fiber has a denier from 20 to 140. The polyester filament is about 2 weight percent to about 60 weight percent, based on total weight of the yarn and the elastomeric fiber is from about 1 percent to about 40 percent, based on total weight of the yarn. The elastomeric fiber may have higher draft than the bi-component polyester fiber. The polyester filament comprises poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate) and poly (tetramethylene terephthalate) and said elastomeric fiber is spandex. The yarn may include a sheath of at least one staple fiber. The disclosure also includes a fabric of the bi-component polyester filament and an elastomeric fiber.

1 . A core spun yarn comprising:
 a bi-component polyester filament; and   an elastomeric fiber, said polyester filament having a denier from about 20 to about 150 and said elastomeric fiber having a denier from 20 to 140.   
   
   
       2 . The yarn of  claim 1  in which the polyester filament is about 2 weight percent to about 60 weight percent, based on total weight of the yarn and elastomeric fiber is from about 1 percent to about 40 percent, based on total weight of the yarn. 
   
   
       3 . The yarn of  claim 2  wherein the elastomeric filament has a higher draft than the bi-component polyester filament. 
   
   
       4 . The yarn of  claim 3  wherein the bi-component polyester filament is drafted from 1.01 to about 1.3 times its original length and the elastomeric yarn is drafted from 2.5 to about 4.5 times its original length. 
   
   
       5 . The yarn in  claim 1  wherein said polyester filament comprises poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate) and poly (tetramethylene terephthalate) and said elastomeric fiber is spandex. 
   
   
       6 . The yarn of  claim 5  further including in a sheath of at least one staple fiber. 
   
   
       7 . The yarn of  claim 6  wherein said staple fiber is selected from a group consisting of cotton, viscose rayon, wool, polyester and blends thereof. 
   
   
       8 . The yarn of  claim 6  comprising a sheath of at least one hard fiber having an English cotton count (Ne) from about 4 to about 60. 
   
   
       9 . The yarn of  claim 6  wherein the bi-component polyester fabric is drafted from about 1.01 to about 1.3 times its original length and the elastomeric yarn is drafted from about 2.5 to about 4.5 its original length. 
   
   
       10 . A woven stretch fabric comprising the core spun yarn of  claim 2  in the weft and/or warp. 
   
   
       11 . The woven stretch fabric of  claim 10  wherein the fabric is a plain woven, twill or satin fabric. 
   
   
       12 . The woven stretch fabric of  claim 11  wherein the fabric is denim and has been subjected to a one-step dyeing process of piece dyed fabric. 
   
   
       13 . The woven stretch fabric of  claim 12  which has a weft and/or warp elongation from about 10% to about 35%. 
   
   
       14 . The woven stretch fabric of  claim 13  which is substantially free of any bi-component polyester filament grinning effect. 
   
   
       15 . A core spun yarn comprising:
 a bi-component polyester filament; and   an elastomeric fiber, said bi-component polyester fabric being drafted from about 1.01 to about 1.3 times its original length and the elastomeric yarn is drafted from about 2.5 to about 4.5 its original length.   
   
   
       16 . The yarn of  claim 15  further including in a sheath of at least one staple fiber. 
   
   
       17 . The yarn of  claim 16  wherein said staple fiber is selected from a group consisting of cotton, viscose rayon, wool, polyester and blends thereof. 
   
   
       18 . A woven stretch fabric comprising the core spun yarn of  claim 17  in the weft and/or warp.