Spiral-wound membrane element winding method

Abstract

The invention relates to a spiral-wound membrane element winding method, and belongs to the technical field of filters in water purifying devices. The spiral-wound membrane element winding method comprises the following steps: step one, gluing two sides of a membrane sheet along the length direction, and folding into an M shape, placing fresh water collecting nets in two successive V-shaped grooves in the M shape, and placing thick nets in V-shaped grooves corresponding to two successive V-shaped grooves; step two, superimposing a plurality of folded unit bodies in the step one together, and winding around a water collecting pipe to form coils by taking the lower edge of the M shape as an initial edge. The spiral-wound membrane element winding method provided by the invention has the advantages of reducing gluing edge amount, increasing the effective area of the membrane sheet, improving the utilization ratio of the membrane sheet and the like.

Description

technical field [0001] The invention relates to a method for rolling a roll-type membrane element, and belongs to the technical field of filters in water purification devices. Background technique [0002] Membrane technology is widely used because of its simplicity, high packing density, good water quality, suitable for automatic operation, and convenient maintenance. Due to the compact design and low price of coiled membrane elements, it occupies a large part of the market share. These include microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, electrodialysis membranes, pervaporation membranes, etc. These membrane elements use the separation function of the membrane itself to remove one or more substances in the fluid. , to purify, purify, concentrate and other purposes. [0003] At present, wound membrane elements such as figure 1 As shown, two diaphragms 1 are used to stack the working faces together, a thick net ...

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Problems solved by technology

[0004] Using the above rolling method, each rolling unit needs to be glued on three sides. When the length of the diaphragm is fixed, the larger the diameter of the coil, the more film pages are needed, the larger the film area occupied by the glue line, and the larger the film. The lower the utilization rate, which hinders the full performance of the membrane performance, and the edge of the glue is easy to accumulate impurities, which is easy to cause pollution; in addition, the longer the membrane length, the longer the water production process and the lower the water production efficiency. In order to improve Water production efficiency, in the case of a certain roll diameter, reduce the unit area of ​​the membrane page, and place a few more small membrane pages. If it is glued on three sides, the more the number of membrane pages, the larger the glue coating area, and the greater the thickness of the membrane. lower utilization

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