semipermeable membrane support, method of manufacturing a spiral type semipermeable membrane element and a semi-permeable membrane support

摘要

In and will contain a binder synthetic fibers and synthetic fibers mainly two or more different fiber diameters, the ratio of smoothness of the non-coated surface and the semi-permeable membrane coated surface is 5.0: 1.0 to 1.1 : semipermeable membrane support is characterized in that it consists of non-woven fabric is 1.0, and at least one binder of synthetic fibers and mainly synthetic fiber, transverse and machine direction (MD) of elongation of 5% (CD) Mean values ​​of the breaking length is and is less than 4.0km, semi-permeable membrane characterized by comprising a nonwoven fabric is 1.0% -0.3 heating dimensional change rate of the horizontal direction (CD) spiral semipermeable membrane element comprising a support with a semi-permeable membrane support and method for manufacturing a semipermeable membrane support.