The air filter is mainly used in the fields of pneumatic machinery, internal combustion machinery and so on. Its purpose is to provide clean air for these machinery and equipment, to prevent these mechanical equipment in the work of inhalation of air with impurity particles and increase the probability of wear and damage. The main components of the air filter are the filter element and the casing, where the filter element is the main filter element, performing the work of gas filtration, and the casing is the external structure that provides the necessary protection for the filter element. The job of the air filter requires that it be able to carry out air filtration without causing excessive resistance to air flow, and that it be able to work continuously for long periods of time.