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

摘要

Disclosed is the method for creating a reinforced hollow fiber membrane by applying reinforcing filaments to a core, 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 yarn 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. A precursor assembly for making a hollow fiber membrane is also provided.

主权项

1. A process of making a reinforced hollow fiber membrane, the process comprising:
applying reinforcing filaments to a core while moving the core longitudinally; casting a dope over the reinforcing filaments and the core; forming a membrane from the dope; removing the core; and shrinking the reinforcing filaments before casting the dope over the reinforcing filaments.