Filter nets, also known as screens, are made by weaving different aperture metal wires. Their function is to filter the molten material flow and increase the flow resistance, thereby removing mechanical impurities and improving the mixing or plasticizing effect. They possess properties such as acid and alkali resistance, temperature resistance, and wear resistance, and are mainly used in industries such as mining, oil, chemicals, food, and mechanical manufacturing. Filter nets are categorized into textile fiber filter nets and metal filter nets.