| 摘要 |
<p>Unstretched hollow fibers of cuprammonium cellulose for dialysis possessing a film structure having a porosity of 15 to 25%, a pore diameter of 25 to 40 A, and an ultrafiltration ratio of 3.0 to 5.5 ml/mmHg.hr.m2 are obtained by: directly discharging a cuprammonium cellulose spinning dope possessing a cellulose concentration of 6.0 to 8.7% and a viscosity of 500 to 1,300 poises (at 20.degree.C) through annular spinning orifices into a non-coagulating solution in a bath filled with a coagulating solution in the upper layer and the non-coagulating solution in the lower layer and, at the same time, allowing the non-coagulating solution to enter and fill up the interiors of the discharged tubes of the spinning dope; then passing the tubes of the spinning dope through the coagulating solution thereby allowing the tubes to be coagulated and allowing the resultant wet hollow fibers to be shaken down onto a conveyor device without being stretched, subjecting the hollow fibers to coagulation, regeneration, and washing the fibers with water while in motion as carried on the conveyor device; then subjecting the regenerated hollow fibers to plasticization, and further shrinking and drying the resultant hollow fibers. The linear speed ratio of the spinning dope discharged through the spinning orifices and the non-coagulating solution allowed to enter and fill up the interiors of the tubes of the spinning dope is 1.2 to 3.0.</p> |
