METHOD FOR PREPARING HOLLOW FIBER MEMBRANE USING FOUR HOLE NOZZLE

摘要

The present invention, with regard to a manufacturing method of a hollow fiber membrane which forms a supporting layer by a TIPS process and forms a coating layer on the supporting layer by a NIPS process, relates to a manufacturing method of a hollow fiber membrane which discharges different spinning solutions simultaneously through a quadruple-spinneret spinning nozzle. The manufacturing method of the hollow fiber membrane according to the present invention uses the quadruple-spinneret spinning nozzle and discharges a non-solvent into the outermost hole of the spinning nozzle. Accordingly, an element which causes the structural change of the surface of the hollow fiber membrane in a phase change process is allowed to be controlled by a small amount of a solvent. Therefore, the manufacturing method of the hollow fiber membrane is effective for the structural change of the hollow fiber membrane and allows the surface of the hollow fiber membrane to be easily changed into a finger structure or a sponge structure regardless of composition of a coagulation bath, thereby having an effect of reducing additional costs according to the reduction of production costs and the recovery of the non-solvent.