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Hollow fiber membrane and braided tubular support therefor

  • US 6,354,444 B1
  • Filed: 06/17/1999
  • Issued: 03/12/2002
  • Est. Priority Date: 07/01/1997
  • Status: Expired due to Term
First Claim
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1. An outside-in hollow fiber asymmetric membrane comprising a flexible macroporous tubular braid support having a tubular film of synthetic resinous material supported on the outer circumferential surface of the braid without the support being embedded in the film which has a wall thickness of less than 0.2 mm, the braid comprising, from about 16 to 60 separate yarns, each on its own carrier, each yarn using multifilament 150 to 500 denier (gm/9000 meters) yarn, each multifilament being made with from 25 to 750 filaments, each filament being from 0.5 to 7 denier, the braid being woven with from 1 to 3 multifilament ends at from 30 to 45 picks (crosses/inch), with a wall thickness in the range from about 0.2 mm but less than three times the diameter of the yarn from which said braid is woven, the braid having a stable heat-pre-shrunk length which is in the range from about 1% to 20% less than its unshrunk length, an air permeability in the range from about 1 to about 10 cc/sec/cm2 at 1.378 kPa, and extension at break of the pre-shrunk braid is at least 10%,such that the membrane is adapted for use as a microfiltration or ultrafiltration liquid separation membrane.

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