TPU Underwater Pelletizing Extruder Screen Changer
The dual-column screen changer serves as the critical continuous filtration equipment for TPU underwater pelletizing lines. Its core value lies in enabling non-stop screen changes, minimizing pressure fluctuations, and preventing melt degradation. It is tailored to accommodate TPU's processing characteristics—including heat sensitivity, high viscosity, and susceptibility to impurities—with a production capacity range of 500–3000 kg/h. Maintaining a differential pressure control of ≤0.5 MPa ensures pellet uniformity and optimal particle appearance.
Core Advantages of the Dual-Column Screen Changer in TPU Underwater Pelletizing:
Continuous Production: Dual columns operate alternately—one screen produces while the other changes—eliminating downtime and preventing TPU melt degradation from prolonged high-temperature exposure.
Low-Fluctuation Filtration: Progressive filling/venting structure maintains pressure fluctuations ≤±0.2MPa during screen changes, preventing pellet breakage and size inconsistencies.
Channel Optimization: Mirror-polished channels (Ra ≤ 0.4μm) eliminate dead zones and residue buildup, reducing TPU scorching and discoloration risks.
Rigid Sealing: Pressure-driven automatic compensation seals adapt to high-pressure TPU extrusion, preventing material leakage and contaminant ingress.
High-Capacity Compatibility: Dual-column design with large filtration area supports high-filler/recycled TPU production while extending screen lifespan.
Common Issues & TPU Screen Changer Solutions:
1. Issue: Particle discoloration after screen change
Cause: Residual material in runners, uneven temperature distribution
Solution: Optimize runner polishing, calibrate temperature control, reduce screen change time.
2. Issue: Pellet breakage/size inconsistency
Cause: Significant pressure fluctuations during screen changes
Solution: Upgrade to progressive charging venting system, reducing fluctuations to ±0.1MPa
3. Issue: Frequent Screen Clogging
Cause: Excessive impurities, overly high mesh count
Countermeasure: Install 100-mesh coarse pre-filter + 150-mesh fine filter, or use self-cleaning screens
4. Issue: Seal Leakage
Cause: Seal wear, abnormal temperatures
Countermeasure: Replace seals, inspect cooling water circuit, ensure stable temperature control
Based on your TPU production line capacity, hardness (Shore A/D), and virgin/recycled material ratio, we will provide specific filter mesh specifications, differential pressure thresholds for filter changes, and parameter matching solutions for the corresponding melt pump/pelletizing die head.
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071