The main factors affecting the technology of polyester composite needle felt

The rapid development of industry and human activities have caused various emission sources such as industry, life, transportation and construction to emit a large amount of smoke and dust. The particulate matter in the atmosphere has increased sharply, and the environment has become increasingly harsh, which affects human health. Therefore, people pay more and more attention to materials that can safely protect dust particles, and increase the development and application of such materials. Filtration refers to a process of separating and capturing particulate matter dispersed in a gas or liquid. The development of dust removal and purification technology, the improvement of its level and the expansion of its application range have made people have higher requirements for the quantity, variety and quality of dust removal textiles. Therefore, research and development of protective textile materials for filtering and dust removal are becoming more and more important. At present, the application fields of my country's filtration and separation textiles are very wide, and affected by the national environmental protection policy, the filtration and separation textile industry has continued to maintain rapid growth in recent years, and the high-temperature filtration textiles have increased significantly. Non-woven fabric processing methods are diverse, and the best fiber tortuous system can be designed according to the density gradient of the filter material, and the production is more reasonable and economical. The filtration efficiency of non-woven fabrics is closely related to its structure. Studies have shown that the smaller the porosity of the non-woven fabric, the greater the fiber filling rate, the stronger the interference effect on the particles, the higher the collection efficiency, and the better the filtration efficiency. As an emerging non-woven filter material, needle felt has a unique three-dimensional network structure, uniform pore distribution, reasonable fiber warp system and good filtration performance, plus the characteristics of high output and low cost. Instead of traditional woven and knitted filter materials, it has become the mainstream of filter materials for bag filters. When the medium flows through the needle felt, the mesh pores of the filter material enhance the dispersion effect and improve the filtration efficiency. Needle felt can not only inhibit the penetration of dust particles into the deep layer, extend the service life, but also quickly form a dust cake to enhance the filtering effect. Conclusion: (1) The primary and secondary order affecting the thickness and areal density of polyester composite needled felt is filter felt structureu003e fiber ratiou003e needled density. In the filter felt structure, the higher the mass fraction of polyester staple fiber with lower linear density, the smaller the surface density of the polyester composite needled felt and the smaller the thickness. (2) The primary and secondary order affecting the mechanical properties of polyester composite needled felt is needled densityu003efiber ratiou003efilter felt structure. When the needle punch density is 900 punches/cm², [15% (mass fraction) 0.90 dtex polyester + 35% (mass fraction) 2.20 dtex polyester]/50% (mass fraction) 2.78 dtex polyester composite needle-punched filter felt mechanics The best performance. (3) The primary and secondary order that affects the air permeability of polyester composite needle-punched felt is filter felt structureu003e needle-punched densityu003e fiber ratio. When the needle punch density is 7 punches/cm², the air permeability of the composite needle felt of [35% (mass fraction) 0.90 dtex polyester + 15% (mass fraction) 2.20 dtex polyester]/50% (mass fraction) 2.78 dtex polyester] the best. (4) The filtration efficiency of PM25 for all samples reached 100%. When the fiber linear density in the polyester composite needle-punched felt is smaller, the filtration efficiency is greater; with the increase of the fiber linear density, the fiber web is relatively fluffy, and the fiber voids increase, the power diffusion and inertia effect decrease, and the filtration efficiency decline.