To choose and use medical masks correctly, and to understand the precautions for using medical masks in advance is the performance to the patient and the person in charge of the medical staff. Do not squeeze the mask with your hands
All kinds of masks, including N95 masks, can only isolate the virus on the surface of the mask. The simple test method is: After putting on the medical mask, exhale forcefully, the air cannot leak from the edge of the mask. Retained deposition: The larger particles moving with the airflow are retained by the mechanical sieving effect of the filter material. Diffusion deposition: Brownian motion of particles diffuses and shifts to filter fibers, and is adsorbed by molecular gravity.
Easy to capture small-scale particles, fine fibers and low-speed moving particles.Inertial deposition: When particles pass through the curved mesh channel of the filter material, the particles China FFP3NR protective masks escape from the airflow and hit the filter fiber due to inertia, and are trapped by molecular gravity.Their working principle is to filter air containing harmful substances through the filter material of medical masks before being inhaled or exhaled by people.
The smaller the particles, the stronger the deposition effect of and the larger the particles, the better the effects of 2,3, so it is not that the smaller the particles, the more difficult it is to filter. Medical masks belong to the second category of medical equipment, most of which are self-priming filter masks. Electrostatic attraction deposition: the deposition of particles caused by the electrostatic action of the filter fiber.
papermask