Patent ID: 7160455

Claim:
A hollow fiber membrane module comprising: a module housing; a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes, at least one end portion of the bundle being fixed on the housing; and a rib and a ring, at least one part of the rib and the ring being embedded in a potting portion fixing the end portion of the hollow fiber membrane in the housing with a potting material in the state where a hollow portion thereof is open, wherein the potting material is a flexible material, the ring is directly fixed on an inner wall of the housing or integrally molded with an inner wall of the housing, the rib is directly fixed on the ring or integrally molded with the ring, and the rib and ring are embedded in the potting portion without directly contacting the hollow fiber membrane, and the rib has a pre-coating layer consisting of the potting material and having a thickness of at least 1 mm that separates the rib from the hollow fiber membranes.