초록 ▼

The invention provides a process for producing a tubular membrane assembly comprising helically winding at least one strip of fibrous material on a mandrel to produce at least a single ply tubular support member for a semi-permeable membrane, characterized by passing the strip through a heated secti

The invention provides a process for producing a tubular membrane assembly comprising helically winding at least one strip of fibrous material on a mandrel to produce at least a single ply tubular support member for a semi-permeable membrane, characterized by passing the strip through a heated section of the mandrel during the helical winding thereof to flatten and smooth fibers protruding along the cross-sectional width of the strip, whereby a tube with a smooth inner bore along its entire length is formed.

대표청구항 ▼

[ What is claimed is:] [1.] A process for producing a tubular membrane assembly, comprising the steps of(a) helically winding at least one strip of fibrous material on a mandrel;(b) heating adjacent surface portions of said strip and mandrel at the point of contact with the mandrel as said strip is

[ What is claimed is:] [1.] A process for producing a tubular membrane assembly, comprising the steps of(a) helically winding at least one strip of fibrous material on a mandrel;(b) heating adjacent surface portions of said strip and mandrel at the point of contact with the mandrel as said strip is wound in a curled state on the mandrel;(c) simultaneously applying pressure to said heated portions of said strip and mandrel to selectively flatten and smooth only fibers protruding along the cross-sectional width of said strip surface portion; and(d) subsequently heat sealing adjacent edges of said strip after said heating and pressure steps to form a tubular support member having a smooth inner bore for a semi-permeable membrane.