Disposable face masks are one of the most commonly used daily necessities in daily life, and everyone is familiar. However, there are many types of masks. In fact, there are many types of masks. Today I will introduce to you what the filtering principle of medical masks is. The editor of disposable masks will give a brief introduction to users. Let’s take a look.
Brownian motion: Because the particle size is too small, it is susceptible to the constant impact of other gas molecules, causing their trajectory to be irregular Brownian motion, and adsorbed on the fiber surface, the smaller the particle, the stronger the effect; the intercepting particle size is too large, It cannot penetrate the voids of the fiber and is directly captured by the fiber surface. The larger the particle size, the better the effect.
Inertial impact Inertia is the continuous nature of the particle itself. If the gas and the suspended particles hit the filter cloth or filter material at the same speed, the gas will change its flow direction along with the holes in the filter material. At this time, the larger particles Because of inertia, it will still maintain the original flow direction, and thus hit the filter material to achieve the filtering function. The larger the mass and the faster the particle, the better the filtering effect.
Electrostatic attraction: because the fiber is charged, it induces very fine particles to be adsorbed on the surface of the fiber. The smaller the particle size and the lighter the particle, the easier it is to be attracted;
Sedimentation: direct sedimentation caused by the gravity of the particles themselves, but captured by the filter material; the greater the mass, the more opportunities.
When choosing anti-smog masks, you should look at the mask’s implementation standards, observe the product packaging and body, and see if there are clear and recognized implementation standards. Some manufacturers declare that they meet the standards without passing the standard certification. Pay attention These problems: When purchasing, pay attention to the instructions on the mask packaging to determine whether the material meets which standard; look at the brand of the mask and choose a regular manufacturer and well-known brand, so that it will be guaranteed.
In addition, most medical masks are disposable and cannot be cleaned and reused after use. If you find that the medical mask has expired, you should immediately replace it with a new one.
Post time: Nov-30-2020