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How dust masks work

by:GESTER Instruments     2021-03-28
Medical disposable masks are necessary respiratory protection products for medical workers and patients when they come into contact with them. They play a two-way isolation of germs and protect patients and medical workers from infection by the other side's germs. Medical disposable masks seem to have a simple structure, but how does it work? Is there anything to pay attention to in use? The working principle of disposable medical mask filter material 1. Diffusion deposition: Brownian motion of particles diffuses and shifts to filter fibers, and is adsorbed by molecular gravity. zui 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 filtering mechanisms, the most easily penetrating particle size range of ordinary mechanical filter media is 0.1m~0.3m. The dustproof principle of dust masks: The protective function of masks is roughly based on the three principles of filtration, adsorption and killing. 1. The material and textile method of the filter mask make the gap of the mask smaller than the diameter of the virus. The cotton gauze mask that filters the virus out of ordinary material is mainly based on this principle and plays a protective role.' Therefore, its protective effect is relatively low. General gauze masks The principle of dust blocking is mechanical filtration, that is, when dust hits the gauze, it passes through layers of barriers to block some large particles of dust in the sand cloth. 2. The electrostatic effect of the adsorption mask will adsorb the virus on the outer layer of the mask. Such as the so-called adding an electrostatic filter layer. Activated carbon masks mostly adopt the principle of adsorption, and the low concentration of toxic and harmful gases and particulates from the outside world are absorbed to achieve the dust-proof effect. 3. The material of the killing mask has a sterilization function to directly kill Viruses. For this type of mask collar and labor insurance network refer to professional medical masks, which are suitable for the protection of air-borne respiratory infectious diseases, and have a very good blocking effect on dust and haze. Masks play a two-way isolation. Germs, protect patients and medical workers from infection by other bacteria. Precautions for the use of medical disposable masks 1. Wear time suitable. Medical protective masks can be used continuously for 6-8 hours, and they should be replaced in time when the following conditions are met: Respiratory impedance Significant increase (when breathing is difficult); when the mask is damaged or contaminated; the mask cannot be tightly attached to the face; after contact with patients or pathogen carriers. 2. Perform a tightness test after wearing it. Wear a disposable medical mask for facial tightness Test. The simple test method is: After putting on a disposable medical mask, exhale forcefully, and the air cannot leak from the edge of the mask is qualified. 3. Do not squeeze the mask with your hands. All kinds of masks, including N95 masks, can only be used. The virus is isolated on the surface of the mask. If you squeeze the mask with your hands, the virus will soak through the mask with droplets, resulting in an increased chance of infection.
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