| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for sufficiently removing a hydrophilic polymer remaining in a hollow fiber membrane at a low cost and in a short time without enlarging equipment. SOLUTION: In the manufacturing method of the hollow fiber membrane 10 comprising a step of coagulating a film forming stock solution containing the hydrophobic polymer and the hydrophilic polymer to form the hollow fiber membrane 10, and a hydrophilic polymer removing step of removing the hydrophilic polymer remaining in the hollow fiber membrane 10, at least the pressure-reduction to discharge the hydrophilic polymer to the outer peripheral side of the hollow fiber membrane 10 is conducted by reducing pressure of the outer peripheral side of the hollow fiber membrane 10 as the hydrophilic polymer removing step. In this occasion, it is preferable that the pressure-reduction is conducted to the hollow fiber membrane 10 immersed in a washing solution. COPYRIGHT: (C)2008,JPO&INPIT
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