What I want to talk to you about today is the electret treatment and the electret masterbatch of the mask, which are closely related to these indicators. Of course, what I want to talk about here is mainly the medical masks, because the current mass production lines on the surface of the mask are actually civilian masks. The Mask filters out mechanical barriers and static cling. Fiber filter material is a kind of common material to treat pollution and purify air and water. The mechanism of dust collection mainly depends on English surname diffusion, interception, inertia collision, direct interception and other mechanical blocking effects, but this kind of mechanical blocking effects on particles smaller than 1 m have poor filtering effect and can not play a purification role. If, in addition to the original mechanical barrier effect, electrostatic adsorption is added to the air filtration process, charged particles in the gas phase are directly attracted and captured by COULOMB forces, or neutral particles are induced to become polar and captured, it can filter the submicron particles in the gas carrier phase more effectively, and greatly enhance the filtering efficiency, but the air resistance will not increase. This is called high efficiency and low resistance filter material. The electret material happens to have this property.
How do you know the filtration efficiency of a mask if you don't have a mask tester? An easy way to do this is to see if the mask can straighten the long hair on your feet as it nears your thighs! Electret treatment can increase the mask electrostatic adsorption capacity, electret masterbatch can let static electricity for a long time.