What is the function of the filter bag?

Depending on the mechanical properties of different size dust in a fluid movement, filter dust removal mechanism involves the following aspects: 1, Screening effect Mesh filter media is generally 5 ~ 50μm, when the dust size or larger than the pore diameter of the mesh or dust deposited on the gap between the dust filter between, namely dust resistance stay. For new fabric filter, because the gap between the fibers that is much larger than the pore size of the dust particle size, so screening has little effect, but a lot of dust filter surface deposition after the formation of the dust layer, screening significantly enhanced. 2, Inertial collision Usually the larger particle size of dust rely mainly on the inertia collision trap. When the dust stream close to the filter fibers, the fibers will bypass airflow, where larger particles (greater than 1μm) due to inertia, departing from the airflow line, continue along the original direction of movement, the impact to the fiber is trap. All large dust particles in the dust within the trajectory of the critical line can reach the surface of the fibers trapped. This inertia collision, with the dust size and air flow rate increases strengthened. Therefore, improving the air flow rate through the filter can be improved inertial collision. 3, The interception effect When the dust stream close to the filter fibers, fine dust particles together with the air flow around, if the radius of the dust particles larger than dust particles away from the center to the edge of the fiber, that is due to contact with the fiber dust was blocked. 4, Diffusion For less than 1μm dust particles, especially less than 0.2μm sub-micron particles, molecules in the gas flow line from the impact, like the gas molecules as Brownian motion, and if the fiber contact during exercise, you can from the gas stream separated. This effect is called diffusion, with its velocity decreases, the fiber diameter is reduced and dust is enhanced. 5, Electrostatic Many fiber woven filter, when airflow through, since the friction will produce static phenomenon, but also dust due to friction and other reasons, live in the transportation process, which will be formed between the filter and the dust particles a potential difference, when the dust filter with the airflow tends, due to the Coulomb force to promote fiber filter dust and impact and enhance the suction force of the dust filter and trapped, improve collection efficiency.