The selection of filter cloth must meet the filter technical requirements of the filter paddle. The new filter cloth should be shrunk before production. The opening diameter should be smaller than the filter plate aperture. When the filter plate is matched, the cloth hole and the plate hole should be relatively concentric. It should be close to the wall of the cylinder, otherwise it will cause unclear filtration, low filtration rate, rupture of the cloth cylinder, and the effect of failing to achieve the expected filtering purpose.