Patent ID: 6919026

Claim:
A semipermeable membrane support comprising, a non-woven fabric consisting of a single layer consisting of a mixture of main fiber and binder fiber, both of which are formed of synthetic resin fine fiber, the non-woven fabric being manufactured by paper making, heating and pressing, wherein the non-woven fabric has an air permeability of 0.5 to 7.0 cc/cm 2 /sec, and an average pore size of 5 to 15 μm, wherein the semipermeable membrane support has a ratio of a tensile strength in a paper feeding direction to that in a width direction of 2:1 to 1:1, wherein the main fiber is formed of polyester fiber having an average single fiber fineness of 0.6 to 8.9 decitex, and wherein the binder fiber is formed of polyester fiber having an average single fiber fineness of 0.6 to 8.9 decitex.