Hollow fiber membrane and the spinning process of hollow fiber membrane

摘要

PROBLEM TO BE SOLVED: To provide a method of producing a hollow-fiber membrane with stable quality by preventing the occurrence of fiber breakage in the hollow-fiber membrane production.;SOLUTION: In a dry-wet fiber spinning method for obtaining a hollow-fiber membrane by discharging a spinning raw solution obtained by evenly dissolving a polymer, a solvent, a non-solvent out of a plurality of spinning caps 1, passing the discharged solution through a mid-air running part, and thereafter immersing the resulting product in an agglomeration bath 4, the method for spinning fibers for a hollow-fiber membrane is characterized in that the hollow running part is surrounded with an air gap tube 2 for shutting the mid-air running part from outside air and in that the shortest distance L1 of the inner wall of the air gap tube and the spinning raw solution discharged out of the spinning caps is adjusted to be 10 mm or longer and 50 mm or shorter.;COPYRIGHT: (C)2010,JPO&INPIT