Dust masks/masks (suitable for dust and powdered chemicals such as sodium carbonate, sodium bicarbonate, etc.) And there are three principles for the selection of anti-virus masks/masks:
First, the dust-proof efficiency of the mask. The dustproof efficiency of the mask is based on its barrier efficiency for fine dust, especially for respirable dust below 5 microns. Because dust of this particle size can directly enter the alveoli, it will have a great impact on human health. Generally, the dustproof principle of gauze masks is mechanical filtration, that is, when dust hits the gauze, some large particles of dust will be blocked in the gauze through layers. However, for some fine dust, especially dust less than 5 microns, they will enter the respiratory system through the mesh of the gauze. At present, there are some dust masks in foreign countries, the filter material of which is composed of fibers full of static electricity. In the process of passing through this filter material, respirable dust less than 5 microns is attracted by static electricity, adsorbed in the filter material to capture fine dust, and plays the role of dust prevention.
The second is the degree of sealing between the mask and the shape of the face. Air is like water. Where there is less resistance, flow first. When the shape of the mask is not close to the human face, dangerous substances in the air will leak into the human respiratory tract from the inclosed place. Then, even if you choose a good filter material mask. Nor is your health guaranteed. At present, many foreign laws and regulations stipulate that workers should conduct regular mask tightness tests. The purpose is to ensure that workers choose the appropriate size mask and follow the correct steps to wear the mask.
Third, it is comfortable to wear. The breathing resistance should be small, the weight should be light, the wearing should be hygienic, and the maintenance should be convenient. Only in this way can workers be willing to insist on wearing them in the workplace and improve work efficiency. At present, foreign maintenance-free masks do not need to be cleaned or replaced. When dust is saturated or the mask is damaged, it will be discarded. This not only ensures the hygiene of the mask, but also avoids the time and energy for workers to maintain the mask. Moreover, many masks are arched, which can not only ensure a good fit with the shape of the face, but also maintain a certain space around the mouth and nose, making it comfortable to wear.
Dust masks mainly prevent harmful particles in the air (including droplets, blood, Viruses, germs, etc.) to their own harm. The KN100 masks and N95 masks in Dust masks are high-grade dust masks, which have a filtration efficiency of 99.97% and 95% respectively for fine particles above 0.075 microns. At the same time, compared with medical masks that only have a disposable half mask on the market, the composite KN100 mask has a replaceable filter cotton and a reusable silicone mask body, which is more suitable for workers returning to work, so that workers do not have to change masks frequently. Utilization efficiency, save enterprise protection cost.
Both medical masks and dust masks are effective in filtering virus particles in the air, but the factories that resumed work In terms of environment, the compound KN100 mask is more suitable for the protection of returning workers. And long before the outbreak of the epidemic, the compound KN100 mask has made a great contribution to the prevention of pneumoconiosis. It is believed that through this epidemic, more workers will use the compound KN100 mask, and the zero growth of China's pneumoconiosis will be realized as soon as possible.