| abstract |
(57) [Summary] [Object] To provide a method for producing a high-quality ultrafine fiber web with improved card passing property. In a method for producing an ultrafine fiber web by subjecting a splittable conjugate fiber to a card and then subjecting the splittable conjugate fiber to split fibrillation by physical impact, a bias in component distribution is imparted to the fiber cross section of the splittable conjugate fiber, and after stretching, the machine is drawn. It is subjected to relaxation heat treatment without applying crimps to develop a three-dimensional crimp of 5 pieces / 25 mm or more, and then applied to a card. |