Spiral type separation membrane element
An object of the invention is to provide a spiral separation membrane element that can reduce the pressure loss of a feed-side channel and be much less vulnerable to the problem of inhibition or blockage of the flow in the feed-side channel. The spiral separation membrane element includes one or more separation membranes, one or more feed-side channel components, one or more permeation-side channel components, and a perforated hollow core tube around which the separation membranes, the feed-side channel components and the permeation-side channel components are wrapped, wherein the feed-side channel component is a net formed by fusion bonding.
1. A spiral separation membrane element, comprising a separation membrane, a feed-side channel component, a permeation-side channel component, and a perforated hollow core tube around which the separation membrane, the feed-side channel component and the permeation-side channel component are wrapped, wherein
the feed-side channel component has a three-layer structure that includes a first layer, a second layer and a third layer, the feed-side channel component comprising:
warp yarns substantially parallel to the direction of feed fluid flow;
oblique yarns in a direction oblique to the direction of feed fluid flow; and
reverse oblique yarns in a direction that is reversely oblique to the direction of feed fluid flow with respect to the direction of the oblique yarns.
2. The spiral separation membrane element according to claim 1 , wherein the second layer is interposed between the first layer and the third layer, and the second layer is composed of the warp yarns.
3. The spiral separation membrane element according to claim 1 , wherein the feed-side channel component includes a plurality of intersections between each of the warp yarns, the oblique yarns and the reverse oblique yarns, wherein at each intersection, the warp yarns, the oblique yarns and the reverse oblique yarns overlap.
4. The spiral separation membrane element according to claim 3 , wherein the intersections have a thickness of 0.5 to 1.0 mm.
5. The spiral separation membrane element according to claim 1 , wherein the warp yarns, the oblique yarns and the reverse oblique yarns each independently have a diameter of 0.1 to 0.5 mm.
6. The spiral separation membrane element according to claim 1 , wherein each of the oblique yarns are 2 to 5 mm apart.
7. The spiral separation membrane element according to claim 1 , wherein the warp yarns are thicker than the oblique yarns and the reverse oblique yarns.
8. The spiral separation membrane element according to claim 1 , wherein the warp yarns are thinner than the oblique yarns and the reverse oblique yarns.
9. The spiral separation membrane element according to claim 1 , wherein the oblique yarns and the reverse oblique yarns intersect at an angle α from 60° to 120°.
10. The spiral separation membrane element according to claim 9 , wherein the angle α is 90°.
11. The spiral separation membrane element according to claim 9 , wherein the warp yarns bisect the angle α.
12. The spiral separation membrane element according to claim 1 , wherein the oblique yarns are substantially parallel to each other, and the reverse oblique yarns are substantially parallel to each other.