Patent ID: 8591684

Claim:
A method of manufacturing a spiral reverse osmosis membrane element comprising a cylindrically wound body comprising a perforated core tube and, spirally wound therearound, a separation membrane having a skin layer on a porous support, a feed-side passage material and a permeation-side passage material in a laminated state, and a sealing portion for preventing a feed-side liquid and a permeation-side liquid from being mixed together, the method comprising film-forming the skin layer on the porous support to form the separation membrane, spirally winding the separation membrane, the feed-side passage material and the permeation-side passage material in a laminated state around the perforated core tube to form a spirally wound body, and applying a sealing resin to edges of the separation membrane facing through the permeation-side passage material from the porous support side so as to prevent the a feed-side liquid and the permeation-side liquid from being mixed together, so that the separation membrane at the edge is impregnated with the sealing resin at least up to the vicinity of the skin layer, wherein the sealing resin is a polyurethane sealing resin having a viscosity of 20-40 Pa·s in impregnation.