Patent ID: 7335301

Claim:
A method of preparing a leaf packet for a spiral filtration module comprising the steps of: providing a membrane sheet; applying a UV curable adhesive to a surface of said membrane sheet, across the width of said membrane sheet, wherein said UV curable adhesive is comprised of a material selected from the group consisting of epoxidized polybutadiene, acrylate-terminated polybutadiene, methacrylate-terminated polybutadiene, acrylate-terminated polyisoprenes, methacrylate-terminated polyisoprenes, acrylate-terminated chloroprenes, methacrylate-terminated chloroprenes, acrylate-terminated polyethers and their copolymers, methacrylate-terminated polyethers and their copolymers, acrylate-terminated polyesters and their copolymers, methacrylate-terminated polyesters and their copolymers; exposing said adhesive to UV radiation to cure said adhesive; and dividing said membrane sheet across the width of said membrane sheet along a line to provide first and second membrane leaves, wherein said line is within the portion of said membrane sheet to which said adhesive is applied in said applying step, wherein said cured adhesive reinforces said membrane sheet in the area of said line.