The function of the filter mesh is to filter out impurities, fine dust, debris, etc. in the liquid, and has the properties of acid resistance, alkali resistance, temperature resistance, wear resistance, etc. It is mainly used in mining, petroleum, chemical industry, food, medicine, machinery manufacturing and other industries. Filters are divided into textile fiber filters and metal filters. The machine on which the filter screen is installed is called a filter and is used to filter natural water and food, etc. In the medical industry, some filters are used in plasma filters to remove clots, impurities and foreign bodies in blood or blood products, and some are used in ventilators to filter fine dust and toxic gases.