PURPOSE: To increase the membrane permeating flux at the time of filtering a raw fluid contg. suspended matter by using a composite filter membrane having an anisotropic structure.
CONSTITUTION: A filter membrane forming liq. is cast over a continuously traveling support consisting of filter paper, nonwoven fabric, woven fabric and glass fiber through a casting coater to form a filter liq. membrane, the support is traveled so that the liq. membrane is brought into contact with the surface of a liq. coagulant to solidify the liq. membrane. Consequently, a composite filter membrane with the diameter of the hole of the filter membrane changed continuously or discontinuously in the membrane thickness direction and having an anisotropic structure in which the diameter of the hole on one surface of the precision filter membrane is different from that on the other surface is produced.
KOZONO YUKO
ISODA SATOSHI
