SEMIPERMEABLE MEMBRANE SUPPORTING BODY, SPIRAL-WOUND SEMIPERMEABLE MEMBRANE ELEMENT, AND METHOD FOR PRODUCING SEMIPERMEABLE MEMBRANE SUPPORTING BODY
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United States of America Patent
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Issued Date -
Aug 30, 2012
app pub date -
Oct 18, 2010
filing date -
Oct 21, 2009
priority date (Note) -
Abandoned
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Abstract
A semipermeable membrane supporting material formed of a non-woven fabric comprising two or more main synthetic fibers having different fiber diameters and a binder synthetic fiber and having a semipermeable membrane application surface and a non-application surface having a semipermeable membrane application surface:non-application surface smoothness ratio of from 5.0:1.0 to 1.1:1.0, a semipermeable membrane supporting material formed of a non-woven fabric comprising a main synthetic fiber and a binder synthetic fiber, having an average breaking length of less than 4.0 km in the machine direction (MD) and the cross direction (CD) at an elongation by 5% and having a dimensional change ratio, measured under heat in the cross direction (CD), of −0.3 to +1.0%, a spiral-type semipermeable membrane element including the above semipermeable membrane supporting material, and a process for producing a semipermeable membrane supporting material.
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