Membrane cartridges with transverse pleating, and method and apparatus for making membrane cartridges with transverse pleating

摘要

A method for making a transverse pleated cartridge comprising multiple membrane layers, wherein the method comprises: a) placing two membrane strips, extending in substantially opposite directions, so that a portion of an edge of a membrane strip membrane is adjacent to a part of an edge of the other membrane strip, forming a first seam; b) joining the adjacent edge portions of the membrane strips along the first seam to form a membrane layer; c) making a 45 ° fold in each membrane strip towards the first seam, and then overlapping it, to form a second seam at 90 ° with respect to the first seam; d) joining the adjacent edge portions of the membrane strips along the second seam to form another membrane layer; e) making a 45 ° fold in each membrane strip towards the second seam, and then overlapping it, to form another first seam at 90 ° with respect to the second seam; f) repeating steps (b) to (e), thereby forming the cross-pleated cartridge with a stacked arrangement of passageways between the membrane layers.