Process for manufacturing regenerated cellulose hollow fiber

摘要

A regenerated cellulose hollow fiber exhibiting a good cellulose II crystalline structure and an exchanged wet strength/wet elongation ratio is prepared by a process wherein: a dope comprised of cellulose ester in a non-volatile organic solvent is extruded through a circular slit defined between inner and outer tubes of a spinning nozzle having a double tube structure, while a core liquid is forced through the inner tube of said nozzle; the hollow fibrous extrudate is coagulated in a coagulating bath; the coagulated hollow fibrous extrudate is drawn 1.05 to 2.00 times its original length; and then, the drawn hollow fiber still containing a core liquid in the hollow is treated with an aqueous caustic alkali solution containing at least 0.5% by weight of a water soluble metal salt, thereby hydrolyzing the cellulose ester into cellulose.