Method to make a yarn-reinforced hollow fibre membranes around a soluble core

摘要

A reinforced hollow fiber membrane Is made by applying reinforcing filaments (26) to a core (12), casting a dope over the filaments and core, forming a membrane from the dope, and removing the core. The core may be a moving core, and the reinforcing yarns may comprise warp yarns and a spiral wrap yarn. The core may be soluble and removed by dissolving it. The core may be pre -wrapped with a yam before the warp yarns are applied. The resulting reinforcing cage may be pre -shrunk before it is coated with a membrane dope. The pre -wrapped yarn may be removed, for example by dissolving it, after the reinforcing cage is coated.