Cellulose dialysis hollow fibre membrane - contg. several layers in which thickness increases and decreases while wall thickness remains constant

摘要

Hollow fibre dialysis membrane of cellulose, regenerated from cuprammonium solns., consists of 2 or more strongly adhering layers with a through-going cavity and having a constant wall thickness. In at least 2 layers, layer thickness along the circumference increases continuously at least once to a max. thickness and decreases to a min. thickness. At each circumference position, the layer thicknesses are restored to a wall thickness which remains constant along circumference. High permeability is achieved while leakage hazard frequency is reduced to less than one-tenth.