Reduced lateral leakage in reverse osmosis devices
AssigneeNL Chemical Technology, Inc.
InventorRobert J. Petersen
Life of this patent
Estimating the term…
Abstract
Spiral wound reverse osmosis devices with reduced lateral leakage and thereby increased salt rejection are made by compacting a microporous layer within a composite reverse osmosis membrane longitudinally along its lengthwise periphery. Means and method for causing longitudinal indentations in composite membranes during manufacturing operations are disclosed and described.
Claims6
A reverse osmosis membrane suitable for seawater desalination comprising a length of a nonwoven web coated with a microporous layer of a plastic upon which a semipermeable salt rejecting discriminating layer is deposited, the membrane characterized by having at least one longitudinally indented surface strip along an edge of the membrane, the indented surface being in contact with and corresponding to a compacted strip of the microporous plastic coating.
Dependencies are inferred from the claim text.