Process and appts. for spinning semipermeable hollow fibres of cellulose

摘要

Process and appts. are claimed for the prodn. of semi-permeable hollow fibres from regenerated copper/ammonia cellulose by extrusion of a cellulose-cuoxam soln. through ring nozzles of an appts. of hollow fibre spinning nozzles into a free space following the appts., and then into an aq. sodium lye where they are stretched and worked up conventionally. The hollow fibre spinning nozzles in the appts. are circular or in series and/or parallel. The hollow fibres are firstly stretched in the free space by their own wt. They are then stretched in a spinning funnel (which is in a pptn. bath). An extension stream is produced in the conical spinning funnel by the pressure difference between the funnel inlet and the funnel outlet. The hollow fibre mass is then subjected to redirection, opt. further stretched mechanically, passed through further post-treatment paths, stretch dried and rolled.