Classification Of Protective Masks

Protective Mask is a kind of respiratory protective equipment for the purpose of preventing the spread of certain respiratory infectious microorganisms and protecting the health of the body. From production to market, medical protective equipment has to go through a series of production links such as raw material procurement and processing, cutting, welding, sterilization, de-thinning, and product inspection. This process takes about 25 days.

The mask body of the daily protective mask is made of filter material, and the wearer relies on spontaneous breathing to overcome the resistance of the filter material to the airflow, so it is called a self-priming filter respirator. When inhaling, the low air pressure inside the mask causes airflow into the mask; when exhaling, the air pressure inside the mask is higher than the ambient air pressure, and the airflow is discharged through the mask.

When the filter material of the mask meets the requirements of the standard, and the mask is sufficiently close to the user's face, most of the inhalation airflow will be filtered by the filter material. Daily protective masks cannot be 100% close to the human face. This is affected by many factors such as the shape of the face, the smoothness of the skin, and whether there are hairs under the mask. Most of the particulate matter inhaled by wearing daily protective masks comes from leakage, so the tightness of daily protective masks is the key to ensuring the effectiveness of high-efficiency filters. In order to reduce leakage, daily protective masks must be designed with a solid structure, and a certain pressure is applied by the headband and nose clip to make the mask fit the face tightly.Daily protective masks are mainly divided into two categories: dust masks and gas masks.

Dust Mask: It is a mask with the ability to protect against harmful dust and aerosols. Dust masks are generally cup-shaped, which can effectively fit on the mouth and nose to achieve the effect of dust prevention. Dust masks are usually used to block dust or exhaust gas, and cannot filter out germs.

Anti-virus mask: It is a respiratory protective equipment used to protect the respiratory organs from toxic biological warfare agents and radioactive dust.

Medical protective masks are composed of a mask body and a tension band. The mask body is divided into three layers: inner, middle and outer. The inner layer is ordinary sanitary gauze or non-woven fabric, the middle layer is ultra-fine polypropylene fiber meltblown material layer, and the outer layer It is a layer of non-woven fabric or ultra-thin polypropylene meltblown material. This high-efficiency medical protective mask has strong hydrophobic and air permeability, has a significant filtering effect on small virus-carrying aerosols or harmful dust, and has a good overall filtering effect. The materials used are non-toxic and harmless, and are comfortable to wear. It can prevent infections caused by airborne infectious agents ≤ 5μmg in diameter or close (≤ 1m) contact with droplet-borne diseases. The particle filtration efficiency of the mask filter material should not be less than 95%, and the protection level is high.

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