1、Smaller fluctuation of material flow pressure in the process of screen changing, which can ensure the continuous and stable production of products. 2、Equipped with filter plate preheating work and exhaust structure, material pressure, material flow, material temperature balance transition during screen changing, especially suitable for high transparent and high precision products. 3、To achieve no leakage of material, no film breakage, no thread breakage, no fluctuation, no downtime to change t