Patent ID: 6068771
Filing Date: 2000-05-30
Classification: B01D,B29C

Abstract:
A method of preparing a spiral wound filtration module from at least one filtration leaf comprising first and second membrane sheets having a permeate carrier sandwiched between the sheets, and a permeate carrier tube having openings along its length, said method comprising the steps of:winding at least one of said leaves about said tube to present opposed spiral end faces which extend in a plane normal to the axis of said tube;supplying liquid adhesive to at least one of said end faces;applying a vacuum through said permeate carrier tube to draw said liquid adhesive in an axial direction away from said face; andsubjecting said filtration leaf to centrifugal forces which act to resist movement of said liquid adhesive under the influence of said vacuum,whereby flow of said adhesive into said permeate carrier is controlled by balancing said centrifugal forces and the force applied through said vacuum.