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Non-woven fabric manufacturers tell you the secret of meltblown cloth
At present, meltblown non-woven fabrics are widely used in the field of filter materials. Since the 1970s, various types of electrostatic filters have been developed and utilized, such as various charging techniques and charging techniques by mixing different fibers. A direct result of this is the current electrostatic electret method (process). The current electret methods mainly include electrospinning, corona charging, triboelectric charging, thermal polarization, and low-energy electron beam bombardment. Due to the different electrostatic electret methods (processes) of the materials, the properties of the formed electrets are also very different.
The filtration performance of the meltblown non-woven fabric itself is actually only less than 70%. The mechanical blocking effect of the aggregate is not sufficient. Otherwise, blindly increasing the weight and thickness of the material will greatly increase the filtration resistance. Therefore, the melt-blown filter materials generally add electrostatic charge effect to the melt-blown cloth through the electrostatic electret process, and use the electrostatic method to improve the filtration efficiency, which can reach 99.9% to 99.99%. That is, the KN95 standard.
Electret air filter material utilizes the electret polarity of the fiber itself to electrostatically adsorb dust and capture bacteria and viruses. It provides high-efficiency and low-resistance filtration quality with microfiber three-dimensional aggregation high porosity and fiber open electrostatic electret performance. The mechanism of action of the electret antibacterial meltblown cloth is that the strong electrostatic field and microelectron flow generated by the electret stimulate the bacteria to mutate and damage the proteins and nucleic acids, destroy the surface structure of the bacteria, and cause the death of the bacteria. The tourmaline itself releases negative ions to block The metabolic processes of some bacterial microorganisms, including the respiratory system, the activity of enzymes, and the transfer of substances from the cell wall, inhibit bacterial cells to play an antibacterial role.
Melt-blown electret filter material mainly captures particles through the dual effects of mechanical blocking and electrostatic adsorption. The mechanical barrier effect is closely related to the structure and properties of the material: when the melt-blown cloth is charged with corona with a voltage of several hundred to several thousand volts, the fibers diffuse into a network of holes due to the electrostatic repulsion, and the size between the fibers is much larger than size of the dust, thus forming an open structure. When the dust passes through the meltblown filter material, the electrostatic effect can not only effectively attract the charged dust particles, but also capture the polarized neutral particles with the electrostatic induction effect. The higher the electrostatic potential of the material, the greater the charge density of the material, the more point charges, and the stronger the electrostatic effect. Corona discharge can greatly improve the filtration performance of polypropylene meltblown cloth. The addition of tourmaline particles can effectively improve the electret efficiency, increase the filtration efficiency, reduce the filtration resistance, increase the charge density of the fiber surface, and enhance the ability of the fiber web to store electric charges. Adding 6% tourmaline electret has better overall effect. Too much electret material will instead increase carrier mobility and neutralization.
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