To efficiently divide and attenuate fibers by charging the fibers and other compositions into a barrel and rotating a screw having protrusions.
Fibers and other compositions are charged into a barrel and a screw having many rodlike protrusions on the surface thereof is rotated to thereby apply a shearing force to divide and attenuate the fibers. Island-in-sea fibers comprising (A) a polyvinyl alcohol-based polymer and (B) a water- insoluble polymer, in which either of the components A and B is an island component and the other is a sea component, are preferred as the fibers. The polyvinyl alcohol-based polymer having ≥80 mol% sponification degree is preferred as the component A and a cellulosic polymer or a polyacrylonitrile-based polymer is cited as the component B. Cellulose acetate and cellulose itself are cited as the preferred cellulosic polymer.
HIKASA JUNICHI
OMORI AKIO
