The function of the dust mask, as the name suggests, is to prevent inhalation of dust. The key to the performance of filter media is its performance
The fineness of filter material for dust mask; The diameter of the fiber is micron. The fiber diameter of filter material used for dust mask should be less than 5 microns. At present, the diameter of polypropylene Microfiber is 4.0 μ m, and the diameter of microfiber filter material is less than 2 μ M. There is a positive correlation between fiber abuse and dust-proof efficiency, that is, the finer the fiber, the higher the dust-proof efficiency.
Composition and structure of filter material for dust mask: the organizational structure of filter material is related to the manufacturing process of filter material. At present, the molding process of synthetic nonwoven filter materials mainly includes needling method, direct injection method, bonding method, hot melt method, etc. Hot melt injection molding method is commonly used. Two or more different fiber materials can be used for composite molding by this method, which improves the dust-proof efficiency, and is relatively soft and has good air permeability.
Charging property of dust cover filter material: the size of two typical filter media belts is positively correlated with the composition efficiency, that is, the larger the static charge is, the better the dust-proof effect is.
When passing through the filter material, there will be the following situations: collision interception: when the particle size of the dust is larger than the gap between the filter fibers, the dust collides with the surface of the filter material, changes the direction due to inertia and force, and settles on the surface of the filter material.
Winding effect: there is burr on the fiber. When the filter material passes through the filter material, it will be caught by the burr on the fiber to prevent the particles from penetrating.
Multistage filtration: the filter material is made of ultra-fine fibers overlapping and woven into a network, forming a multi-layer "three-dimensional structure", and the dust is cut off layer by layer when passing through the filter material.
Electrostatic effect: the filter material has static charge, repels dust particles with equivalent polarity, and absorbs dust particles with opposite polarity, that is, to capture dust.
July 01, 2021
