Mask is a kind of sanitary products, generally refers to wear in the mouth and nose position used to filter the air into the mouth and nose, in order to block harmful gas, smell, droplets in and out of the wearer's mouth and nose appliances, made of non-woven cloth.Masks have a certain filtering effect on the air into the lungs, in the respiratory tract infection epidemic, dust and other pollution in the environment, wearing masks has a very good effect. Masks can be divided into the following categories according to the nature of use: Civil daily protective mask: it is mainly used for filtering out particulate matter in the air pollution environment in daily life.According to its protection level can be subdivided into: anti-haze mask and cotton mask two types.Anti-haze mask is used to effectively filter PM2.5 in the haze weather, its main characteristics are good filtering performance,...