Tubular filtration membrane, apparatus and method for making same.

摘要

The invention relates to a membrane tube 1 comprising a tubular substrate 2 and a membrane layer 3 thereon, the substrate 2 having a substantially longitudinal seam 4. The substrate 2 is a single ply polyester, formed from a tape 5 which is slit to a desired width so that when it is formed it forms a tube of a desired outside diameter, preferably from 3mm and upwards. The membrane layer 3 is applied to the interior surface of the tube 2 in a viscous dope, which is subsequently set to a gel to form a plastic membrane layer. The viscous dope can be a polymer such as a polysulphone.