Views: 9 Author: Site Editor Publish Time: 2021-10-13 Origin: Site
At present, water purifiers can be divided into four categories according to the size of the filtration accuracy: microfiltration, ultrafiltration, nanofiltration and reverse osmosis.
In each of these four types of water purifier, the first filter is PP cotton, why is it always PP cotton that is placed in the first stage?What advantages does it have?
PP cotton cartridge is a tubular cartridge made of non-toxic and odourless polypropylene particles, which are heated and melted, sprayed, traction and accepted into shape. If the raw material is mainly polypropylene, it can be called PP soluble spray cartridge.
Water flows from the outside of the PP cotton to the inside, through layers of filtration, the closer the inner layer of the cartridge, the smaller the pore size, the higher the precision of filtration. Particulate impurities in the PP cotton cartridge pore channel, the phenomenon of bridging will occur, even if the particles smaller than the pore channel, can also be blocked, so as to remove the various particles in the filtered liquid impurities.
The outer layer of the PP cotton cartridge has thicker fibres, while the inner layer has finer fibres, the outer layer is relatively loose, while the inner layer is tighter, forming a gradual change and tightening of the multi-layer gradient structure. Each layer of this multi-layer structure can intercept and store the impurities in the water, and when the multiple layers are added together, the dirt-holding capacity will be very large.
PP cotton raw material polypropylene fibres rely on self-bonding intertwined, forming a three-dimensional curved microporous structure, and traditional fabrics and combed into a network of non-woven fiber distribution is different, it has a larger surface area, higher porosity. Large surface area and more small pores, can let the water quickly through the PP cotton, will not make too much difference in the height of the water inside and outside, so not only filtering flow, but also the pressure difference is smaller.
Polypropylene by meltblown, traction, so that polypropylene fibres rely on self-bonding mutual entanglement, forming different shapes and sizes of PP cotton cartridge. Unlike other cartridges, the bonding of PP cotton cartridges does not require the use of other materials. Due to the clean chemical composition of PP cotton and in line with food hygiene standards, there will be no secondary pollution of the liquid to be filtered due to the material, making it safer to use.
The chemical stability of PP cotton and its raw material polypropylene has a close link. The chemical stability of polypropylene is very good, in addition to being concentrated sulfuric acid, concentrated nitric acid erosion, a variety of other chemical agents are more stable. Because of this performance, PP cotton is widely used in various fields such as chemistry and electronics.
The role of PP cotton should not be underestimated, but it serves as the first threshold of water purifier filtration, the water diameter of small colloids, metal ions, microorganisms and other impurities need to be handed over to the subsequent activated carbon cartridge, RO membrane cartridge, etc. for deeper filtration treatment.