Dual Screen Changer for Plastic Pelletizing Production Lines
The dual screen changer serves as the core equipment enabling non-stop continuous filtration in plastic pelletizing production lines. Mainstream models include dual-column, single-plate dual-station, and dual-plate dual-station types. It accommodates pelletizing of raw materials and recycled feedstocks such as PP/PE/PET/PA, ensuring stable impurity filtration while safeguarding pellet quality and production efficiency.
Core Principle and Structure
Core Logic: Dual stations operate alternately. While one station performs online filtration, the other remains on standby or undergoes replacement. Hydraulic drive enables rapid switching, typically completing screen changes in ≤0.4 seconds with minimal material flow and pressure fluctuations.
Standard Components: Screen changer body (with heating/sealing) + hydraulic station (often equipped with accumulator) + electrical control cabinet (supports automatic/manual switching).
Core Value (Pelletizing Applications)
Continuous Production: Non-stop screen changes prevent strand breaks, material waste, and production downtime—ideal for high-frequency screen changes with recycled materials.
Consistent Quality: Optimized flow channels + rigid/flexible seals minimize pressure fluctuations during changes, reducing melt stagnation and degradation. Ensures uniform pellet color and melt index.
Cost Reduction: Extended screen life reduces labor maintenance and energy consumption. Reliable sealing prevents material leakage, minimizing raw material loss.
Broad Compatibility: Withstands temperatures ≤350°C and pressures ≤50MPa. Suitable for low to medium-high viscosity melts (100–40,000 Pa·s), covering general-purpose, engineering, and recycled materials.
Application Case
Recycled PP Pelletizing Line: Equipped with a dual-column, dual-station screen changer enabling non-stop screen changes. Daily output increased by approximately 15%, strand breakage rate reduced to below 0.5%, and screen life extended by 2x.
Highly Filled PET Pelletizing: Dual-plate, dual-station configuration boosted filtration area by 40%. Pressure fluctuation <0.3MPa, achieving 99.8% pellet pass rate.
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