(Air Filter) is mainly used in pneumatic machinery, internal combustion machinery and other fields, the role is to provide clean air for these mechanical equipment, to prevent these mechanical equipment in the work of inhaling air with impurity particles and increase the probability of abrasion and damage. The main components of the air filter are the filter element and the casing, of which the filter element is the main filtration part, which undertakes the filtration work of the gas, and the casing is the external structure that provides the necessary protection for the filter element. The working requirements of the air filter are to be able to undertake high-efficiency air filtration work, not to increase too much resistance to air flow, and to work continuously for a long time.