Fiber structure

Abstract

Provided is a fabric having a ground weave to which a hygroscopic polymer is fixed, and the fabric generates heat under moisture absorbing conditions and provides a more comfortable feeling to a person by temperature drop in moisture desorption conditions. A fiber structure is prepared by fixing a hygroscopic polymer to fibers of the fabric, and the front layer on the front surface side and the back layer on the back surface side have different fiber densities where the boundary between the front layer and the back layer is on the center line of a cross section of the fiber structure.

1 . A fiber structure prepared by fixing a hygroscopic polymer to fibers of a fabric, a front layer on a front surface side of the fiber structure and a back layer on a back surface side of the fiber structure having different fiber densities, a boundary between the front layer and the back layer being on a center line of a cross section of the fiber structure. 
     
     
         2 . The fiber structure according to  claim 1 , wherein the fabric is in the form of a woven fabric or a knitted fabric, and the fabric has a ground weave in the back layer side. 
     
     
         3 . The fiber structure according to  claim 1 , wherein the hygroscopic polymer is a polymer of one or more monomers selected from sodium acrylamido-2-propanesulfonate, sodium styrenesulfonate, sodium isoprenesulfonate, sodium allylsulfonate, and sodium methallylsulfonate or a copolymer of one or more of the monomers and an additional monomer except the monomers. 
     
     
         4 . The fiber structure according to  claim 1 , wherein the hygroscopic polymer is fixed to the fabric in a fixing ratio of 4 to 20% by mass. 
     
     
         5 . The fiber structure according to  claim 1 , wherein the number of cross section fibers contained in the back layer divided by the number of cross section fibers contained in the front layer (the ratio of the numbers of cross section fibers) ranges from 2 to 10, where the fiber structure is cut in the direction perpendicular to a weaving or knitting direction of the fiber structure, and the center line of the cross section is the boundary between the front layer on the front surface side and the back layer on the back surface side. 
     
     
         6 . The fiber structure according to  claim 1 , wherein the fabric has a weave selected from the following groups a to c:
 group a: a warp knit that is produced with a knitting machine equipped with two or more reeds and has a two needle swing weave or a three needle swing weave for the back layer;   group b: a weft knit that is produced with an interlock knitting machine and has a patterned weave for the front layer; and   group c: a pile fabric having a ground weave.   
     
     
         7 . A vehicle interior material comprising the fiber structure according to  claim 1 .