Device and process for producing a reinforced hollow fibre membrane

摘要

A nozzle for making a reinforced hollow fibre membrane discharges one or more reinforcing yarns at or near a plane where the dope exits the nozzle, or in the same plane as a discharge opening of dope passage, or both. Multiple discrete yarn discharge openings may be spaced around a longitudinal axis of the nozzle. A reinforcing yarn passage remains generally free of dope during use. The dope may be discharged in an annular ring inside of the one or more reinforcing yarns, in an annular ring outside of the reinforcing yarns, or both. Minimal tension is required to pull the yarns through the nozzle, which helps to reduce distortion of the membrane cross section in a coagulation bath.

主权项

1. A process for making a hollow fiber membrane comprising the steps of,
a) passing a bore fluid through a nozzle and discharging the bore fluid from a front face of the nozzle; b) passing a dope through a dope passage of the nozzle and discharging the dope from the dope passage in a ring around the bore fluid from the front face of the nozzle; c) passing a reinforcing yarn through a reinforcing yarn passage, wherein the reinforcing yarn passage is not in communication with the dope passage until the reinforcing yarn exits from a reinforcing yarn outlet through the nozzle; and d) introducing the reinforcing yarn into contact with the dope after the reinforcing yarn exits from the reinforcing yarn outlet.