The working principle of medical mask filter material
1. Diffusion deposition: Brownian motion of particles diffuses and shifts to filter fibers, and is adsorbed by molecular gravity. It is easy to capture small-scale particles, fine fibers and low-speed moving particles.
1. Diffusion deposition: Brownian motion of particles diffuses and shifts to filter fibers, and is adsorbed by molecular gravity. It is easy to capture small-scale particles, fine fibers and low-speed moving particles.
2. Retaining deposition: The larger particles moving with the airflow are retained by the mechanical sieving effect of the filter material. The ratio of the particle diameter to the diameter of the filter membrane fiber affects the interception efficiency.
3. Inertial deposition: When the particles pass through the curved mesh channel of the filter material, the particles escape from the airflow and hit the filter fiber due to inertia, and are trapped by the action of molecular gravity. Large particles, high density and high speed have good interception effect.
4. Electrostatic attraction and deposition: The particles are deposited by the electrostatic action of the filter fiber.
The smaller the particles, the stronger the deposition effect of 1, 4, and the larger the particles, the better the effects of 2, 3, so the smaller the particles, the more difficult it is to filter. Synergistic effects of various filtration mechanisms, the easy-penetrating particle size range of ordinary mechanical filter media is 0.1m～0.3m.
Medical masks are generally composed of the following materials:
Main filter material: such as polypropylene melt blown cloth, etc. Other materials: metal (used for nose clips), dyes, elastic materials (used for mask straps), etc.
Main filter material: such as polypropylene melt blown cloth, etc. Other materials: metal (used for nose clips), dyes, elastic materials (used for mask straps), etc.
Medical masks generally have the following forms:
According to the shape of the mask, it can be divided into flat shape, duckbill shape, arch shape or folding type. According to the wearing style, it can be divided into ear-hook style, strap style or headband style.
According to the shape of the mask, it can be divided into flat shape, duckbill shape, arch shape or folding type. According to the wearing style, it can be divided into ear-hook style, strap style or headband style.
