| 摘要 |
PURPOSE:The spinning dope containing a solvent is extruded out of annular orifices and simultaneously the core solution is extruded in liquid, then solidified to produce hollow fibers of high flux and selectivity in stabilized operability. CONSTITUTION:The core solution is extruded from the center of the annular orifices at or above its melting point, while the coagulation bath is kept at or beneath the melting point of the core solution, thus the core solution is solidified in the coagulation bath. In the process where the spinning dope gels by the coagulation solution, the dope is protected by the core solution to stably give porous hollow fibers, since the coagulation proceeds, slowly, even when the hollow fibers are only several micron thick.
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