When Will The Calendering Technology No Longer Sacrifice The Permeability Of Filter Material?

< p > needle punched nonwoven air filter material is a three-dimensional structure material with small porosity and uniform distribution. The total porosity can reach 70%~80%. Its characteristics are high dust removal rate, good air permeability, large ash removal capacity, and strong throttling and blocking effect on dust. It has better filtration performance than two-dimensional fabric filter made of woven fabric. However, the defects of needle punched filter material are easy to fall down and affect the service life of products. < /p >
< p > in order to improve the phenomenon of < a href= "http://www.91se91.com/news/index_c.asp" > down > /a >, many domestic enterprises have made surface punched treatment of needle punched filter material to make smoke and dust accumulate on the surface of filter material, so as to prolong the service life of filter material. However, in the process of singeing, although the time of singeing is short, because of the high flame temperature, it will inevitably cause uneven melting of some fibers on the surface of the filter, which may lead to the formation of the fusion plaque, which will affect the filtering effect. < /p >
In order to eliminate the fusion knot, researchers from the Department of materials science and engineering of Imperial College London in P are trying to combine singeing and calendering technology. According to the relevant technical personnel, the combination test of singeing and calendering is based on commonly used high temperature needle punched filter polyester polyester needle cleaning felt and Mei TASS needle felt. The experimental data show that after the singeing and calendering finishing, the elimination rate of the two kinds of needling products is over 98%, and the filtering effect has been improved. Among them, the effect of the sodium flame method is especially prominent, and the increase is 100%. < /p >
< p > the researchers analyzed that this is because in the process of air filtration, dust particles can be captured on the surface of filter material besides the a href= "http://www.91se91.com/news/index_c.asp" > fibrous layer < /a >. From the point of view of economic benefit, the smooth surface of the filter material can make the filter cake easy to fall off and achieve the purpose of ash removal. The filter material after cleaning can be used again, thereby improving the service life of the needle punched filter material. < /p >
< p > I personally believe that although the current "a href=" http://www.91se91.com/news/index_c.asp "burn calendering technology" /a "two in one" is in its infancy, the finishing of needle punched filter material is an important means to improve the phenomenon of falling down, eliminating the knot, improving the filtration performance and performance. At the same time, the internal blockage of the filter material can also be alleviated. When the air blowback is used, the pressure of the blowback air stream should not be too large, thus greatly reducing the energy consumption. < /p >
< p > however, the technical problem that has not yet been solved is that after the calender is rolled, the internal structure of the filter material becomes compact and the gap between the fibers decreases, even though the molten agglomeration can be removed, so the permeability of the filter material will be reduced after finishing. In addition, from the discrete coefficient that reflects the uniformity of the sample, it is also found that the undispersed filter material has a small dispersion coefficient and a large coefficient of filtration material after being processed. This is because the uniformity of the unfinished filter material is mainly affected by the carding machine. When the mesh is formed and the needle punching process is more reasonable, the uniformity of the filter material can be ensured, and the dispersion coefficient of the air permeability is relatively small. Due to the influence of many factors on the finishing process, the uniformity of the product is not easy to control. In the process of singeing, the size of the flame, the speed of cloth insertion, the temperature and pressure in the calender, these factors make the air permeability of the product appear uneven. Therefore, the calendering finishing of the filter improves the filtration efficiency of the filter material, but the air permeability of the filter material must be sacrificed. Nowadays, resolving this contradiction has become a major issue for researchers all over the world. < /p >