| abstract |
(57) [Abstract] [Problem] Underwear as a high-quality woven or knitted fabric with high hygroscopicity, It can be used as a comfortable material such as sportswear. A core-sheath conjugate fiber comprising a hydrophilic component and a fiber-forming polymer as constituent components, has a moisture absorption / desorption parameter (ΔMR) of 1.0% or more, and has a flatness defined by the following formula: Is in the range of 1.05 to 3.0, the flat core-sheath conjugate fiber excellent in hygroscopicity. Flatness = (distance in the major axis direction of the fiber cross section) / (distance in the minor axis direction of the fiber cross section) |