PRODUCTION METHOD OF POROUS MULTI-LAYERED HOLLOW FIBER

摘要

PROBLEM TO BE SOLVED: To provide a production method of porous multi-layered hollow fiber by which excellent filtration performance can be maintained over a long period of time and further durability of a porous membrane toward inner pressure, external pressure, bending or the like can be improved. SOLUTION: After ruggedness is given on an outer peripheral surface 30a of a porous drawn PTFE (poly(tetrafluoroethylene)) tube 30, a porous drawn resin sheet 31 is wound around the tube 30. Load is applied thereto simultaneously with the winding or after winding to bring the porous drawn PTFE tube 30 into close contact with the porous drawn resin sheet 31 and then the porous drawn PTFE tube 30 and the porous drawn resin sheet 31 are integrated by sintering. COPYRIGHT: (C)2006,JPO&NCIPI