self-cleaning melt filter is engineered for high-contamination post-consumer plastic recycling pelletizing lines. Different from conventional rotary-blade screen changers, it adopts an innovative working principle: scrapers stay static while mesh plates rotate, discharging contaminants by discharge screw. It achieves continuous online filtration without frequent screen replacement, effectively solving pain points including frequent shutdown, heavy material loss, blade quick-wear and melt carbonization for PCR-PP, PE, PS, ABS and PET recycling lines. It is highly suitable for HDPE / LDPE food-grade pelletizing production with strict requirements for melt purity.
1. Two groups of filter plates work simultaneously to enlarge effective filtration area and shorten melt flow path.
2. Mesh plates rotate at low speed; stationary short scrapers tightly fit mesh-plate surface to scrape off contaminants.
3. Scraped impurities are conveyed by independent discharge screw; cooling structure installed at screw outlet discharges impurities in solid-state.
4. Continuous filtration & automatic slag discharge, no interruption to extrusion production and nearly no pressure fluctuation.
|
Item |
Self-Cleaning Filter |
Conventional S-Type Rotary-Blade Filter |
| Working Principle | Scraper stationary, rotating mesh plate; screw slag discharge. | Rotating scraper, stationary mesh plate; hydraulic valve slag discharge. |
| Filtration Area & Flow Channel | Dual-plate simultaneous filtration, large filtering area, short melt flow path. | Single-plate filtration only, limited filtering area, long flow path. |
| Component Wear | Mesh plate runs at low rotating speed, extremely low wear. | Blade rotates at high speed, heavy wear & frequent replacement. |
| Scraping Performance | Blade length equals 1/2 of mesh-plate diameter, small contact surface, tight fitting, thorough contaminant removal. | Blade full-diameter contact; local deformation easily occurs, resulting in incomplete cleaning. |
| Mesh-Plate Design | Optimized thickness, high-pressure-resistant without deformation, smooth melt passing. | Thicker mesh plate, higher flow resistance for molten plastic. |
| Slag Discharge Mode | Screw discharge with cooling pocket; impurities discharged in solid form. Minimum material loss, negligible pressure drop, stable running. | Hydraulic valve on-off discharge; large quantity of clean polymer is wasted, sharp pressure fluctuation occurs. |
| Melt Quality | Low shear heat generation from slow-rotating mesh plate, precise temperature control, stable pellet quality. | High shear heat from fast-rotating blade, risk of polymer carbonization & degradation. |
Before Retrofit 350 model screen changer with 40-mesh screen pack, screen replacement required every 15 minutes.
After Retrofit Model-500 mesh-less self-cleaning filter with 60-mesh laser-welded mesh plate.
· Laser mesh service life reaches 1000 tons throughput
· Daily production increase: 1 300 kg
· Daily waste reduction: 1 400 kg
· Save about 100 pieces of filter screens per day
· Product selling price increases by 5 JPY per kilogram
Test feedstock 1：PP+PE+PS mixed waste Contaminants: aluminum foil, wood chips, glass, paper, sand, glass fiber Actual measured slag discharge ratio: 1 %
|
Model |
Filter Diameter(mm) |
Max Capacity(kg/h) |
Filter Mesh |
Filtration Precision |
Heating Power |
Main Motor Power |
Discharge Screw Motor Power |
Applicable Polymers |
| DW-2-360 | φ360*2 | ≤500 | 10-150 mesh | 100-2000 μm | 26 kW | 4.5 kW | 1.1 kW | PP, PE, PS, ABS, PET |
| DW-2-500 | φ500*2 | ≤1000 | 10-150 mesh | 100-2000 μm | 40 kW | 5.5 kW | 1.1 kW | PP, PE, PS, ABS, PET |
| DW-2-700 | φ700*2 | ≤1800 | 10-150 mesh | 100-2000 μm | 52 kW | 7.5 kW | 1.1 kW | PP, PE, PS, ABS, PET |
✅ Eliminate frequent screen-changing shutdown, maximize production uptime
✅ Minimize clean-material loss during slag discharge, improve raw-material utilization
✅ Reduce screen-consumption cost and labor cost for screen replacement
✅ Low-shear running avoids melt carbonization; guarantee stable quality for food-grade PCR pellets
✅ Support heavy-contamination post-consumer plastic; compatible with rigid flakes & film recycling pelletizing lines
✅ Can be configured as primary-stage or secondary-stage filtration unit for existing extrusion-pelletizing system
