FIELD: water and air purification technology.
SUBSTANCE: invention relates to tubular membranes. Tubular membrane comprising: support tube made out of one or more flexible tapes of porous support material which have been helically wound into a tube shape with overlapping tape edges which have been sealed to each other; and a semi-permeable membrane layer made of membrane forming material on an inner wall of the support tube, wherein said inner wall of the support tube has at least one inwardly extending spiral comb that is covered with a membrane layer or forms part of this layer. Method for manufacturing a tubular membrane is also disclosed.
EFFECT: increase in filtration ability due to reduction of boundary layers.
15 cl, 9 dwg
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