Patent ID: 6183639
Filing Date: 2001-02-06
Classification: B01D

Abstract:
In a method of manufacturing a filter module of the type in which a plurality of hollow fibers are arranged in a plurality of bundles secured in an outer housing for filtering a raw liquid through a circumferential surface of the plurality of fibers and an interior hollow perforated tube is provided in the housing for guiding filtered liquid out of the module, wherein the improvement comprises the following steps:securing a first end of a bundle having a longitudinal axis;securing a second end of the bundle;rotating the second end of the bundle in a first direction about the longitudinal axis to twist the bundle and stretch the fibers;sliding a plurality of sleeve segments over the twisted bundle to fix the position of portions of the fibers at predetermined points along a length of the bundle;rotating the second end of the bundle in a second direction, opposite in direction to the first direction, to generate a plurality of outward bows of the fibers from the longitudinal axis of the bundle, thus creating spaces between the fibers in the bundle; andinstalling the bundle within the outer housing.