Membrane leaf packet with reinforced fold
AssigneeDow Global Technologies LLC
InventorsThomas N. Haynes, Pam G. Hinton, Jon E. Johnson, Thomas M. Lanz, Abhishek Shrivastava
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Abstract
The present invention is directed toward membrane leaf packets, spiral wound modules and methods for making and using the same. The subject leaf packet comprises a membrane sheet folded upon itself and reinforced with sealant and tape along at least a portion of the fold on the back side of the membrane sheet.
Claims10
A membrane leaf packet comprising:
- a membrane sheet comprising a first and second side, the membrane sheet folded to define a first and second membrane leaf extending from a fold;
- a sealant located on the back side of the membrane sheet along at least a portion of the fold;
- and
- a tape located on the back side of the membrane sheet along at least a portion of the fold.
A method for making a membrane leaf packet comprising:
- providing a membrane sheet having a first and second side;
- folding the membrane sheet to define a first and second membrane leaf extending from a fold;
- providing a sealant having a viscosity of less than about 50,000 cP;
- providing a tape comprising a front and back side wherein the back side has a surface with a co-efficient of friction of less than about 0.42;
- and
- applying the sealant and the tape along at least a portion of the fold such that the tape covers the sealant.
The method of claim 7 wherein the sealant is first applied to a section of the front side of the tape and the tape is subsequently applied along at least a portion of the fold.
A spiral wound module comprising a plurality of membrane leaf packets and membrane envelopes wound about a permeate collection tube, wherein the membrane leaf packet comprises:
- a membrane sheet comprising a first and second side, the membrane sheet folded to define a first and second membrane leaf extending from a fold;
- a sealant located on the back side of the membrane sheet along at least a portion of the fold;
- and
- a tape located on the back side of the membrane sheet along at least a portion of the fold wherein the tape comprises a front and back side and wherein the back side has a surface having a co-efficient of friction of less than about 0.42.
Dependencies are inferred from the claim text.