SEMIPERMEABLE MEMBRANE SUPPORT

摘要

PROBLEM TO BE SOLVED: To provide a semipermeable membrane support having less generation of membrane defects and less fuzz.SOLUTION: Provided is the semipermeable membrane support formed by laminating nonwoven fabric formed into one layer in a wet type sheet making step so as to become two or more layers by hot pressing processing, and having a pinhole size detected by transmitted beam of 10 pixel numbers or less. An average fiber diameter of a main fiber is 7-12μm and speed in the wet type sheet making step is 30 m/min or less, preferably.