METHOD FOR PREPARING HOLLOW FIBROUS POROUS FILM BY MELT SPINNING

摘要

PROBLEM TO BE SOLVED: To provide a method for preparing a hollow fibrous porous film comprising a thermoplastic resin having a dense pores and high water permeability suitable for the use in filtration such as turbidity removal, and a spinning orifice having a specific shape suitably used in a method for preparing the hollow fibrous porous film. ;SOLUTION: This method comprises the steps of firstly melting a thermoplastic resin and an organic solvent at a high temperature, then extruding the molten material from a spinning orifice for molding a hollow fiber which has an elongation of 1 or more, into a liquid bath in hollow fiber structure to cool and harden via the air while injecting into a hollow part a fluid which forms a hollow part, and subsequently extracting and removing the organic liquid, thereby obtaining a hollow fibrous porous film.;COPYRIGHT: (C)2001,JPO