Patent ID: 8178184
Filing Date: 2012-05-15
Classification: D04H,D06N,Y10S,Y10T

Abstract:
1. A method of producing a wrinkle-free entangled sheet of microfine long fibers which comprises no elastic polymer, the method comprising: forming a long-fiber web made of long fibers for forming microfine fibers, the long fibers comprising a water-soluble, thermoplastic polyvinyl alcohol resin and a water-insoluble thermoplastic resin; entangling the long-fiber web to form a long-fiber entangled sheet; shrinking the long-fiber entangled sheet to form a long-fiber shrunk sheet; and converting the long fibers for forming microfine fibers in the long-fiber shrunk sheet to microfine long fibers, thereby producing the wrinkle-free entangled sheet of microfine long fibers which comprise no elastic polymer, wherein the entangling the long-fiber web is performed such that the long-fiber entangled sheet has an interlaminar peel strength of 2 kg/2.5 cm or more, and wherein the shrinking the long-fiber entangled sheet is performed such that an areal shrinkage is 35% or more.