Masks are one of the everyday items that people use more in daily life, and everyone is familiar with them. However, there are many types of masks. In fact, there are many types of masks. Today I will introduce to you the filtering principle of medical masks.
Brownian motion: Because the particle size is too small, it is susceptible to continuous impact by other gas molecules, causing their movement trajectory to be irregular Brownian motion, and the smaller the particle is, the stronger the effect is when adsorbed on the surface of the fiber; Can not penetrate the gap of the fiber, and then directly captured by the fiber surface, the larger the particle size, the better the effect.
Inertial impact inertia is the continuous nature of the motion of particles. If the gas and the suspended particles impact the filter cloth or filter material at the same speed, the gas will change its flow direction with the holes in the filter material. At this time, the larger particles It will still maintain the original flow direction due to inertia, so it will hit the filter material to achieve the function of filtration. The larger the mass and the faster the particles, the better the filtering effect.
Electrostatic attraction: due to the charging of the fiber, the ultrafine particles are attracted to the surface of the fiber. The smaller the particle size and the lighter the weight, the easier the particles are attracted;
Sedimentation: Direct sedimentation caused by the gravity of the particles, which is captured by the filter material; the greater the mass, the more opportunities.
When choosing an anti-fog mask, look at the mask ’s implementation standards, observe the product ’s packaging and body, and see if there is a clear approved implementation standard. Some manufacturers promote their compliance without the standard certification. Pay attention to These problems; when you buy, you should pay attention to the description of the mask packaging to determine whether the material meets which standard; look at the brand of the mask, choose a regular manufacturer and a well-known brand, so that it will be guaranteed.
In addition, most medical masks are disposable. They cannot be cleaned and used after use. If you find that the medical mask has expired, you should immediately replace it with a new one.