Do not know the anti-fog mask filter principle! Is your mask protected against PM2.5?
With the outbreak of smog weather in most parts of the country in recent years, PM2.5 protective masks have become very popular. Many merchants have started the idea of ​​PM2.5, claiming that the masks sold have the effect of blocking PM2.5 particles. Experts said that there are a large number of anti-PM2.5 masks on the market. Due to the long-term lack of quality standards for PM2.5 masks, the market products are mixed and the quality of adulteration is serious. How should the protective mask be selected to achieve good protection? This starts with the principle of filtration.
First, the filter principle of the mask
One of the main factors affecting the level of mask protection is the filtration efficiency of the filter material. The filter media used to filter particulate matter, whether natural or synthetic, can be summarized in the following five mechanisms for filtering particulate matter in the air:
Second, what kind of mask can achieve PM2.5 effect?
The above filtration principle tells us that large particles of dust are mainly filtered by inertial impact and interception, while small particles are more likely to achieve filtration through diffusion and electrostatic action. Therefore, for particles with a particle size above 1 μm, the interception effect of the dense fibrous network structure relying on the filter material is obvious, but for the majority of the PM2.5 particles, the interception effect is minimal, It is more effective to filter and remove by means of particle diffusion principle and electrostatic principle. Therefore, the effective filter material of PM2.5 is often a melt-blown microfiber nonwoven fabric loaded with static electricity.
At present, the masks currently on the market mainly include cotton masks, gauze masks, medical masks, activated carbon masks and industrial dust masks. How big are the protective effects of these masks on smog? These numbers tell you the truth:
Third, wearing a mask is stressful
After reading the above introduction, I believe that everyone has a professional understanding of the filtration and protection of various masks. When choosing a mask, you should choose a mask that has been filtered by a professional protective mechanism to filter the particles. The mask should be matched with your face. Pay attention to the face and tighten it at the bridge of the nose. The better the fit, the better. The better the effect, otherwise the protection effect will not be achieved.
In addition, you cannot wear a mask for a long time. On the one hand, a large amount of pollutants such as particulate matter are adsorbed on the outside of the mask, which may cause an increase in respiratory resistance and cause discomfort; on the other hand, the inside of the mask also adsorbs bacteria, viruses, etc. in the exhaled breath, and if it is not timely replaced, Cause secondary pollution. Therefore, wearing a mask all day is not correct. If it is to protect against the smog pollution outside, it can be removed indoors. The mask that can be used repeatedly should be cleaned and disinfected every day (the PM2.5 mask is generally not cleanable and can only be replaced), boiled in boiling water for a few minutes, and then taken to the sun to dry and disinfect.
First, the filter principle of the mask
One of the main factors affecting the level of mask protection is the filtration efficiency of the filter material. The filter media used to filter particulate matter, whether natural or synthetic, can be summarized in the following five mechanisms for filtering particulate matter in the air:
Second, what kind of mask can achieve PM2.5 effect?
The above filtration principle tells us that large particles of dust are mainly filtered by inertial impact and interception, while small particles are more likely to achieve filtration through diffusion and electrostatic action. Therefore, for particles with a particle size above 1 μm, the interception effect of the dense fibrous network structure relying on the filter material is obvious, but for the majority of the PM2.5 particles, the interception effect is minimal, It is more effective to filter and remove by means of particle diffusion principle and electrostatic principle. Therefore, the effective filter material of PM2.5 is often a melt-blown microfiber nonwoven fabric loaded with static electricity.
At present, the masks currently on the market mainly include cotton masks, gauze masks, medical masks, activated carbon masks and industrial dust masks. How big are the protective effects of these masks on smog? These numbers tell you the truth:
Third, wearing a mask is stressful
After reading the above introduction, I believe that everyone has a professional understanding of the filtration and protection of various masks. When choosing a mask, you should choose a mask that has been filtered by a professional protective mechanism to filter the particles. The mask should be matched with your face. Pay attention to the face and tighten it at the bridge of the nose. The better the fit, the better. The better the effect, otherwise the protection effect will not be achieved.
In addition, you cannot wear a mask for a long time. On the one hand, a large amount of pollutants such as particulate matter are adsorbed on the outside of the mask, which may cause an increase in respiratory resistance and cause discomfort; on the other hand, the inside of the mask also adsorbs bacteria, viruses, etc. in the exhaled breath, and if it is not timely replaced, Cause secondary pollution. Therefore, wearing a mask all day is not correct. If it is to protect against the smog pollution outside, it can be removed indoors. The mask that can be used repeatedly should be cleaned and disinfected every day (the PM2.5 mask is generally not cleanable and can only be replaced), boiled in boiling water for a few minutes, and then taken to the sun to dry and disinfect.
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