Patent ID: 6186342
Filing Date: 2001-02-13
Classification: B01D

Abstract:
A semipermeable capillary comprising the following:a tubular strengthening layer composed of at least one elongated tape having longitudinal edge sections, said tape being converted into a tubular shape with at least said longitudinal edge sections mutually overlapping; anda tubular semipermeable wall composed of membrane-forming material supported by said strengthening layer;in which said capillary has a fine bore permitting capillarity and has an internal diameter smaller than or equal to 5 mm, andin which said mutually overlapping edge sections have an overlap greater than, or equal to 90.degree.;said mutually overlapping edge sections having been joined together by said membrane-forming material in a simultaneous formation process as the formation of and joining with said strengthening layer of said semipermeable wall by said same membrane-forming material,wherein said tape has an open cohesive structure which is embedded in the membrane-forming material and wherein a continuous phase is formed between the semipermeable wall and the strengthening layer.