The filter element is the heart of the filter, as the name implies. The main principle of the filter element, and thus of the filter, is to purify raw resources and facilitate their reuse. Filter elements are primarily used in filtration industries such as oil filtration, water filtration, and air filtration. By removing a small amount of impurities from the filtration medium, they can protect the normal operation of equipment or maintain the cleanliness of the air. When fluid passes through a filter element with a certain degree of precision in the filter, its impurities are blocked, while the clean fluid flows out through the filter element.