Separator leaf, and spiral wound module and device comprising same
Provided is a separation membrane leaf and a spiral wound module and an apparatus including the same, the separation membrane leaf comprising a separator, a supply-side flow channel material, and a permeation-side flow channel material comprising a tricot, the tricot comprising an adhesive part, and at least a part of the adhesive part being a low density part of the tricot, compared to the rest, wherein the tricot comprises at least one wale, at least one course, and an intersection point at which the at least one wale and the at least one course intersect, and the average distance between two intersection points arranged in parallel in the direction in which the wale of the low-density part is arranged is at least 1.25 times the average distance between two intersection points arranged in parallel in the direction in which the wale of the part other than the low-density part is arranged.
1. A separation membrane leaf, comprising:
a separation membrane;
a supply-side flow path material; and
a permeation-side flow path material,
wherein the permeation-side flow path material includes a tricot;
the tricot includes one or more wales and one or more courses;
the tricot includes an intersection at which any one of the one or more wales and any one of the one or more courses intersect;
the tricot includes a first adhering portion provided in a pair of parallel first and second edge portions where at least a part of the first adhering portion includes a low-weaving-density portion of the tricot compared to a rest of the tricot that has a high-weaving density, and the first adhering portion includes a high-weaving-density portion having the high-weaving density as the rest of the tricot other than the low-weaving-density portion on an outside edge of the tricot, and the high-weaving-density portion is adjacent to one side of the low-weaving-density portion which is in an interior of the first adhering portion;
the first adhering portion includes an average distance between two intersections arranged in parallel in a direction in which the one or more wales of the low-weaving-density portion is arranged is 1.25 times or greater than an average distance between two intersections arranged in parallel in a direction in which the one or more wales of the high-weaving-density portion is arranged, wherein an area of the low-weaving-density portion of the tricot is 0.5% to 5% based on a total area of the tricot; and
the tricot includes a second adhering portion provided in a third edge portion not parallel to the first adhering portion,
wherein bubbles generated in a manufacturing process of the separation membrane leaf can move from a tricot space of the high-weaving-density portion of the first adhering portion and be disposed in the interior low-weaving-density portion of the first adhering portion, thereby enhancing sealability of the first adhering portion because the tricot space of the high-weaving-density portion on the outside edge of the first adhering portion is filled with an adhesive.
2. The separation membrane leaf of claim 1 , wherein the tricot has a thickness of about 0.18 mm (7 milli-inches) to about 0.33 mm (13 milli-inches).
3. A spiral wound module comprising the separation membrane leaf of claim 1 .
4. The spiral wound module of claim 3 further comprising a center tube,
wherein the third edge portion of the tricot is connected to the center tube by the second adhering portion; and
the separation membrane leaf is wound around an outer side of the center tube.
5. The spiral wound module of claim 4 , wherein a ratio (%) of a length of the first adhering portion provided in the pair of parallel first and second edge portions with respect to a total length of the center tube is 1 to 10.
6. An apparatus comprising one or more of the spiral wound modules of claim 3 .
7. The separation membrane leaf of claim 1 , wherein an average distance between two intersections of the one or more wales and the one or more courses included in the low-weaving-density portion of the tricot is from 537 μm to 690 μm.
8. The separation membrane leaf of claim 1 , wherein an average distance between two intersections of the one or more wales and the one or more courses in the high-weaving-density portion is from 410 μm to 444 μm.