The connection between the breathability of the mask and the filtering power

The protection effect of the mask is based on the filtering effect of the mask on harmful substances, the filtering power of the mask on harmful substances is high, the purification of the air is good, the healthier the human body inhales the air, the better the protection effect of the mask, and vice versa is worse. For example, in GB19083-2010 medical protective mask technical request, it is pointed out that the filtering power of the mask used in the medical environment refers to the filtering power of non-oil particles floating in the air, including blood, droplets and secretions with viral nature. The filtering elements of these masks block different particle sizes through interception, dispersion, gravity, inertia and electrostatic effects, but there is always a particle size that cannot be completely filtered, so the filtering power of medical masks is mainly measured for this kind of particles. Therefore, the filtration power of medical masks should be tested for this kind of particle size which is difficult to be filtered, and get a kind of. Useful test results.





In theory, the difference between the breathability of the mask and the filtering power of the mask has a certain correlation. When the breathable function of the mask is extraordinarily poor, the mask itself blocks the outside material from entering the mask, and then plays the effect of protection and does not depend on the filtering power of the mask, but the comfort degree is also. Low, not suitable for human body to wear. When the breathability of the mask is good, the material exchange in the mask table is more frequent, which requires a higher filtration efficiency of the mask, so as to satisfy the material exchange in high frequency, the mask can filter out the harmful substances in the air into the human body to a large extent, so as to play a protective effect. The air permeability and filtration power of the mask should have a good matching degree in order to play the protective effect very well, and it is especially necessary to establish a model between the air permeability and filtration power of the mask and find the relationship between the two.