The mask body of daily protective mask is made of filter material, and the wearer can overcome the resistance of filter material to airflow through spontaneous breathing, so it is called self-priming filter respirator. When inhaling, the low air pressure in the mask makes air flow into the mask; When exhaling, the air pressure in the mask is higher than the ambient air pressure, and the air flow is exhausted through the mask. When the filter material of the mask meets the standard requirements and the mask is close enough to the user's face, most of the inhaled airflow will be filtered by the filter material.
The daily protective mask 100% can't stick to the face, which is affected by many factors, such as face shape, skin smoothness, hair under the mask and so on. Most of the particles inhaled by wearing daily protective masks come from leakage, so the tightness of daily protective masks is the key to ensure the effective filtration materials.
Protection principle
The material used for filtering particulate matter is mineral fiber, natural fiber or synthetic fiber. The mechanism of filtering particulate matter in the air by filter media fibers can be divided into five types, which can play a comprehensive role. When the particles in the airflow bypass the filter material fiber blocked in front of the airflow, the particles with higher quality will deviate from the airflow direction due to inertia and hit the filter material fiber to be filtered.
Particles on the streamline closest to the filter material in the airflow are intercepted by the filter material because the radius of the particles is greater than the distance between the streamline and the filter material. Influenced by the thermal motion of air molecules, tiny particles are impacted by air molecules, constantly changing the direction of motion, showing Brownian motion, and are filtered by random contact with filter media fibers.