| 主权项 |
1. A submerged-type hollow fiber membrane module comprising:
a module case provided with a water-collecting portion and supporting portions; a potting member on the supporting portions; and a bundle of hollow fiber membranes potted in the potting member, wherein one end of each of the hollow fiber membranes is open such that the hollow fiber membranes are in fluid communication with the water-collecting portion, wherein the potting member comprises: a first layer of a first potting material on the supporting portions, the first layer having hardness of 95 to 100 Shore A; a second layer of a second potting material on the first layer, the second layer having hardness of 95 to 100 Shore A; a third layer of a third potting material, the third layer having hardness of 20 to 40 Shore A; and an intermediate layer between the second and third layers, the intermediate layer being formed by a substantial chemical combination of the second and third potting materials, wherein the substantial chemical combination occurs when the third potting material contacts with the second potting material before the second potting material is sufficiently cured to form the second layer, followed by a complete curing of the second and third materials, wherein the second layer is formed on the first layer after the first potting material is completely cured and the second layer is in contact with the first layer, and wherein each of the first potting material and the second potting material is an urethane-based resin or an epoxy-based resin, and the first and second potting materials are different from each other. |
