The blocking effect of melt blown needle punched nonwovens on virus and PM2.5 is incomparable to other nonwovens
The needle punched non-woven protective mask belongs to respiratory protective equipment. The main objects of protection are particulate matter, including dust, fog, smoke and microorganisms. The particles that can penetrate into human lungs are very small and harmful to health. All kinds of pneumoconiosis "punishment" are also the main protection objects of protective masks.
The quality of filter material determines the filtration efficiency. The main material of most protective masks is needle punched non-woven fabric, which can realize the filtering protection function through fiber filtration. At present, most market protection types adopt the method of "melt blown nonwovens + electrostatic adsorption" to intercept PM2.5 particles and dust. The blocking effect of meltblown nonwovens on virus and PM2.5 is beyond the ability competition of other nonwovens. With the three-dimensional structure design, it forms a sealed space with the face, forcing the polluted air to be inhaled and filtered by the human body for breathing, and the filtration rate of particulate matter is usually kept above 95%. Static standing polar technology, electret meltblown nonwovens can capture more particles with opposite charges through electrostatic adsorption mechanism, so as to improve the filtration efficiency of meltblown nonwovens and strengthen the protection of face mask. The principle of fiber filtering dust mainly includes electrostatic adsorption, gravity deposition, inertial deposition, diffusion deposition and direct capture.
According to experts, the price of high-quality meltblown nonwovens is between 30000 yuan and 60000 yuan per ton, and 300000 masks can be produced per ton of meltblown nonwovens. The protective effect of this kind of spraying non-woven materials can basically reach grade B. However, at present, manufacturers in the market buy meltblown nonwoven fabrics of 10000 yuan to 20000 yuan to produce and sell inferior protective masks, Disruption of market order.
The protective effect of mask is not only related to the filtering efficiency of mask material, but also highly related to the sealing (leakage rate) of human face. The sealing and face protection of respiratory protective equipment are directly affected. The filter specifications of the mask should be selected, and the mask's facial fit should also be considered. Good protective mask, the air outside the mask is not easy to enter the mask from the edge and inhaled by the human body, because the face is not sealed, the mask is not worn. The consumer experience survey shows that the sealing effect of general headband is better than that of ear strap, and that of cup type is better than that of folding seal. According to the health manufacturer, adding some gasket at the facial contact and connecting the nose with aluminum nose strip can ensure the problem of mask sticking.