manufacturing process of asymmetric ultrafiltration or microfiltration capillary membranes reinforced with braiding and capillary membrane

摘要

MANUFACTURING PROCESS OF ASYMMETRIC CAPILLARY MEMBRANES FOR ENHANCED OR MICROFILTRATION REINFORCED WITH BRAIN AND CAPILLARY MEMBRANE. A process for manufacturing asymmetric ultrafiltration or microfiltration capillary membranes (1) with braided reinforcement comprising the successive steps of pulling a tubular braid (5) through a die (7) and coating the braid with a dopant, characterized in that before In such a coating step, the braid will be impregnated with a non-coagulant liquid, being a liquid that does not coagulate said dopant when in contact with such a dopant. The result is a membrane with an outer skin, that is, smaller pores near the outer diameter than close to the inner diameter, and a coating that is placed in close contact around the outer diameter of the braid, without any substantial penetration of the coating into the skin. plaited.