Doulbe column hydraulic continuous screen changer
Dual-Piston Screen Changer (also known as Dual-Piston Large Filter Cartridge / Dual-Piston Screen Changer) serves as the core equipment for melt filtration and non-stop alternating screen changes in plastic/chemical extrusion production lines. It is particularly suited for high-capacity operations with high impurity levels (such as recycled materials).
Structure: Dual parallel pistons + dual independent filter cartridge/screen units, hydraulic servo drive system, rigid seals, material feed venting module, differential pressure/temperature/position monitoring with PLC control; main body typically constructed from high-temperature alloy steels like H13, withstanding temperatures up to 400°C and pressures up to 35MPa.
Operating Process
Normal Operation: Dual screens filter synchronously to intercept melt impurities;
Differential Pressure Reaches Setpoint: Hydraulic drive switches operation—one cylinder remains online while the other performs offline screen change;
Material-fed venting expels air from flow channels to prevent bubbles; continuous material flow throughout with minimal pressure fluctuation (typically <1%–5%);
Standby after screen change completion, awaiting next cycle.
Core Performance & Advantages
Massive filtration area: 4–5 times larger than traditional single-column/plate filters, reducing screen changes by 30%–50%—ideal for high-volume production and contaminated materials;
Zero-downtime continuous operation: Eliminates labor and material losses from screen change interruptions;
Minimal Pressure/Temperature Fluctuations: Ensures uniform thickness and color consistency in products like films and pipes;
Rigid Sealing + Precision Flow Channels: Eliminates leakage and dead zones, reducing melt degradation;
High Automation: Interoperates with melt pumps, automatically triggers screen changes and alerts via pressure differential, lowering labor costs.
Typical Applications
Recycling and pelletizing high-impurity plastics (PP/PE/PS/PA/ABS);
Large-scale extrusion lines: blown film, pipe, sheet, cable sheathing;
High-viscosity/high-filtration-precision processes like chemical fiber spinning, hot melt adhesives, and masterbatch production.
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