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Hollow fiber membrane module with covered membrane outer periphery

  • US 8,679,337 B2
  • Filed: 06/03/2009
  • Issued: 03/25/2014
  • Est. Priority Date: 06/04/2008
  • Status: Expired due to Fees
First Claim
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1. A hollow fiber membrane module having no external cylinder covering the outer circumference of the hollow fiber membrane bundles and having fixing layers to which one or a plurality of hollow fiber membrane bundles each comprising a plurality of hollow fiber membranes are fixed at respective ends thereof using a casting resin, a hollow portion of each of the hollow fiber membranes being open at one or both of the ends,wherein the hollow fiber membrane bundle is divided into a plurality of small bundles at at least one of the fixing layers on an open side of the hollow portion, an outer circumference of each of the small bundles is covered with an elastic body, a part of the elastic body is buried in the fixing layer, and a remaining part of the elastic body projects from a filtration portion interface of the fixing layer, and a length by which the elastic body projects from the filtration portion interface is 5 mm to 100 mm, and a position of the filtration portion interface of the fixing layer outside the elastic body is closer to a center of the module than a position of a tip of the casting resin coating an outer surface of the hollow fiber membrane in the elastic body, andwherein the elastic body comprises a heat-shrinkable material that is shrunk to remain in tight contact with the hollow fiber membranes, and also the shape of the elastic body is fixed with no clamping force exerted on the hollow fiber membranes.

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