Mask is a kind of sanitary product, which is usually worn on the nose and mouth to filter the air entering the nose and mouth to block harmful gases, smells, droplets, viruses and other substances. It is made of gauze or paper.
Masks have a certain filtering effect on the air entering the lungs. Wearing a mask has a very good effect when respiratory infectious diseases are prevalent and when working in polluted environments such as dust. Masks can be divided into air filtration masks and air supply masks. ?
On 2002114, the State Council Press Office held a press conference to introduce 224.2 billion masks exported by China in 2020. On February 1 1, the General Administration of Market Supervision and other four departments jointly deployed and deployed again to strengthen the quality supervision of masks.
Plane masks are divided into cotton masks, non-woven mask masks, polymer masks, activated carbon powder filter masks and activated carbon fiber felt masks.
The dust barrier efficiency of the mask is based on its barrier efficiency to fine dust, especially to breathable dust below 2.5 microns. Because dust with this particle size can directly enter alveoli, it has the greatest impact on human health. Gauze mask, its dustproof principle is mechanical filtration, that is, when dust collides with gauze, some large particles of dust are blocked in emery cloth through layers of barriers.
For some fine dust, especially dust smaller than 2.5 microns, it will enter the respiratory system through the mesh of gauze. Dust mask, its filter material is made of activated carbon fiber felt pad or non-woven fabric, and breathable dust smaller than 2.5 microns is blocked in the process of passing through this filter material, which plays a role in filtering air.