| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymeric porous hollow membrane with high durability which reduces the crush of a hollow fiber membrane against an external pressure in a porous hollow fiber membrane utilized for mainly treating an aqueous fluid. SOLUTION: The polymeric porous hollow fiber membrane is disclosed in which 0.1≤Δd/ID≤0.5 is expressed wherein an inner diameter of the hollow fiber membrane is ID (mm) and a membrane thickness isΔd (mm) respectively, in which both the thickness deviation and the roundness of the hollow fiber membrane are 0.75 or more, and in which a dense layer is on the outer surface of the hollow fiber membrane and also when the external pressure of 0.4 MPa is applied for 30 min from the outer side of the hollow fiber membrane the number of the crushes generated in the hollow fiber membrane is one or less per km of the hollow fiber membrane and the water permeability of the hollow fiber membrane is 500 L/hr/m<SP>2</SP>/bar. COPYRIGHT: (C)2009,JPO&INPIT
|
