According to the calculation formula, it is not difficult to see that the hoop stress of the glass fiber reinforced plastic membrane housing is twice the axial stress, that is, when the spiral winding process technology is used for production, as long as the thickness of the hoop winding layer is guaranteed to be the thickness of the longitudinal laying layer Twice as much. At the same time, in order to ensure the fatigue resistance of the FRP membrane housing and 6 times the safety factor, the allowable stress in the circumferential direction of the shell should be: [δy] = δy / K
Where K is the safety factor of the glass fiber reinforced plastic shell, usually 6 ~ 10. In the design calculation of the glass fiber reinforced plastic membrane housing, we can choose the mechanical strength value of the fiber material, first determine the allowable stress in the circumferential direction, and then determine the wall thickness of the shell according to the membrane housing diameter and design working pressure.
We can easily see from the above simple description, compared with the spiral winding process technology, the glass fiber reinforced plastic membrane housing produced by the drawing winding technology has the following advantages:
1. The drawing process is continuous production, and fiberglass membrane housings of various lengths can be processed as required.
2. The inner and outer surfaces are smooth, and there is no need to turn or grind the outer surface like winding. This can not only reduce material consumption and labor intensity, but also reduce environmental pollution.
3. The drawing process is easy to ensure the orderliness of the fiber arrangement, and there is no chaotic zone of fibers intersecting the fibers, which can maximize the performance of the reinforced fibers and ensure the stability of the performance of the glass fiber reinforced plastic membrane housing products.
4. The FRP membrane housing produced by the drawing-winding process has very good wall thickness uniformity, and the average deviation is not greater than 0.1mm, so that the dimensional accuracy of the porous FRP membrane housing can be guaranteed.
5. As the design and maneuverability of the drawing process is stronger, it makes it easier to produce FRP membrane housings with different pressure levels.
FRP Membrane Housings
In short, through the brief introduction and comparison of the above two production technology glass fiber reinforced plastic membrane housings, we can see that due to the new development of the surrounding drawing technology, the production and development of glass fiber reinforced plastic film will play a positive role. But we still need to emphasize that no matter what process is used to produce FRP membrane housing, it is a layer structure. In other words, it is important to choose good fiber reinforcement materials and matrix resin materials to ensure reverse osmosis membrane housings quality. Because of the characteristics of such a layer structure, each layer is fully utilized. The fiber-reinforced properties are suitable for matrix resins to fully wet the fibers. The layer-to-layer bond strength is high. They can better distribute and transfer the membrane and shell stress to each level and truly play the role of a bridge. Therefore, when we discuss the production process of FRP membrane housing, we must emphasize the prerequisites.
