Double column extrusion screen changer
The dual-column no-downtime screen changer is a core filtration device used in the continuous extrusion production of polymer materials such as plastics, rubber, and synthetic fibers. Its most notable feature is the ability to replace the filter screens without interrupting production, ensuring the continuity and stability of the production line.
Core Operating Principle
This equipment operates in a dual-station alternating mode and is equipped with two sets of independent filter columns. During normal production, both sets of filter columns simultaneously filter the melt, sharing the flow and pressure. When the pressure differential rises due to a filter screen in one set becoming clogged with impurities, the hydraulic system rapidly retracts that filter column from the flow path. The other set immediately takes over the entire melt delivery, ensuring uninterrupted material flow and preventing sudden pressure fluctuations. After the retracted filter column completes screen replacement, cleaning, and venting while offline, it smoothly re-engages in the working position, achieving a seamless transition.
Key Advantages
Non-stop screen change: Eliminates downtime losses associated with traditional screen changes, significantly improving production efficiency.
Large filtration area: The dual-flow-path design substantially increases the effective filtration area—up to 4–5 times that of conventional equipment for certain models—extending screen change intervals by over 30%.
High Stability: The rigid sealing structure withstands high temperatures (≤400°C) and high pressure (≤50 MPa), ensuring no material leakage or seepage.
Intelligent Control: Supports three modes—differential pressure triggering, timed switching, and manual emergency mode. Some high-end models feature a PLC automatic control system.
Energy-Efficient and Eco-Friendly: Reduces waste generation and energy consumption, lowering production costs.
Typical Applications
Film Industry: BOPP packaging film, agricultural greenhouse film, etc. Utilizes 80–120 mesh stainless steel screens for fine filtration, reducing the risk of crystal spots and film breakage.
Pipe Production: PVC drainage pipes, PE water supply pipes, medical catheters, etc., meeting high-output and high-purity requirements.
Pelletizing and Recycled Material Processing: Processes recycled HDPE, PP, and other materials with high impurity content to ensure continuous operation.
Sheet and Panel Production: PS food containers, PC skylight panels, and other applications requiring high thickness uniformity and surface finish.
Specialty Materials: PLA/PBAT biodegradable plastics, TPE elastomers, hot melt adhesives, and other high-viscosity or sensitive materials.
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