How do non-woven fabric manufacturers improve the filtration efficiency of meltblown non-woven fabrics

How can non-woven fabric manufacturers improve the filtration efficiency of melt-blown non-woven fabrics? As the core material of medical masks, melt-blown non-woven fabrics directly affect the protective effect of masks. There are many factors that affect the filtration performance of meltblown non-woven fabrics, such as fiber linear density, fiber web structure, thickness and density. As the air filter material of the mask, if the material is too tight, the pores are too small, and the breathing resistance is too large, the user cannot smoothly inhale the air, and the mask will lose its use value. This requires the filter material not only to improve its filtration efficiency, but also to reduce its respiratory resistance as much as possible, and the respiratory resistance and filtration efficiency are a pair of contradictions. The electrostatic electret treatment process is a good way to solve the contradiction between breathing resistance and filtration efficiency.　　Meltblown nonwovens filtration mechanism　　In the filtration mechanism of meltblown filter materials, the generally recognized mechanisms mainly include Brownian diffusion, retention, inertial collision, gravity sedimentation and electrostatic adsorption. Since the first four principles are mechanical barrier, the filtering mechanism of meltblown cloth can be simply summarized as mechanical barrier and electrostatic adsorption. 1. The average fiber diameter of the mechanical barrier polypropylene melt blown cloth is 2-5 μm, and droplets with a particle size greater than 5 μm in the air can be blocked by the melt blown cloth; when the diameter of the dust is less than 3 μm, the melt blown cloth The fibers are randomly arranged with the interlayers to form a fibrous filter layer with multiple curved channels. When the particles pass through various types of curved channels or paths, the dust is adsorbed on the surface of the fiber by the mechanically filtered van der Waals force; When the particle size and air velocity are both large, the airflow approaches the filter material and flows around due to obstruction, while the particles leave the streamline due to inertia and directly collide with the fibers and are captured; The movement produces diffusion and hits the fiber to be captured.　　2, electrostatic adsorption 　　 electrostatic adsorption means that when the fibers of the filter material are charged, the particles are captured by the Coulomb force of the charged fibers (electrets). When dust, bacteria, viruses and other particles pass through the filter material, the electrostatic force can not only effectively attract the charged particles, but also use the electrostatic induction effect to capture the polarized neutral particles. As the electrostatic potential increases, the electrostatic adsorption becomes stronger. Quanzhou Non-woven Fabric Co., Ltd. is a strong non-woven fabric manufacturer, providing customers and friends with high-quality non-woven products, which are well received by consumers. Welcome to call for consultation: Previous: Can masks be mass-produced , Non-woven fabric is the key