CDF Melt Filtration—Process-Controlled Filtration For Contaminated Plastics
Select filtration from contaminant type, load, required fineness, pressure behaviour, polymer loss and downstream quality. Compare upstream cleaning and simpler filtration before recommending CDF.
Efficient, material-saving and durable, the CDF handles even heavily contaminated polyolefins, reliably removing dust, stones, film residues and other contaminants at filtration levels from 90 μm to 1,000 μm.
When Is CDF The Right Filtration Route?
Use CDF for a suitable, pumpable polymer melt where solid contaminants must be removed continuously and where the contaminant load, target fineness, pressure window and discharge behaviour fit the selected model and filter-disc configuration.
Do not position CDF as a substitute for sorting, washing/dry cleaning, drying, degassing, deodorisation or polymer separation. Moisture, volatiles, odour, dissolved substances and incompatible polymers require other process stages. Very large, fibrous, deformable, abrasive, reactive or highly variable contaminants require representative assessment.
Applications:
Contaminants Removed:
Integration:
Adaptive Filtration, New Systems And Retrofits
Conventional melt filters often operate with fixed filtration behaviour, even when contamination levels fluctuate. MAS CDF melt filtration uses PLC control and tracking regulation to adjust key operating parameters as material conditions change — supporting steadier melt pressure, continuous filtration performance and lower melt loss in demanding recycling applications.
The CDF melt filter can be integrated into new MAS recycling systems, where it is installed as standard, or retrofitted into existing extrusion lines. Available designs and filter sizes include the CDF 300 and CDF 500-D. Retrofit projects are particularly relevant where an existing filter is worn, has insufficient capacity or limits melt quality and line performance.
How Adaptive Melt Filtration Works
The CDF melt filter adapts to the material supplied from the extruder and its degree of contamination. Unlike other filters, it operates continuously and can be precisely controlled to the required process point via the PLC — manually or automatically with tracking control.
Constant Melt Pressure
The tear-off pressure on the blades is increased or decreased with the contamination level to maintain constant melt pressure, raising filtered-material quality and reducing waste.
Adaptive Discharge Control
The screw discharge speed adjusts to the contamination of the supplied material via the PLC, and different screw geometries are available for different types and levels of contamination.
Steel Filter Discs, 90–1,000 μm
High-quality steel filter discs offer a filtration fineness of 90 μm to 1,000 μm and a large active surface, ensuring high throughput at low melt pressure and long service life.
Key Advantages
Automated Process Control
Tracking control automatically adjusts operating parameters to reduce melt loss and maintain stable performance.
Extended Component Service Life
Process-optimised control and effective use of the screen area reduce wear and extend operating life.
Fast Return On Investment
High operating savings support rapid amortisation within a few years.
High-Efficiency Contaminant Removal
Removes paper, wood, plastic particles, dust, stones and fine sheet residues from the melt.
Downtime-Free Scraper Maintenance
Scrapers can be replaced quickly without stopping the complete production line.
Heavy-Contamination Capability
Handles large contamination volumes and highly lubricating substances reliably.
Technical Advantages of MAS CDF Technology
| Advantage | What It Means |
|---|---|
| Filtration fineness 90–1,000 μm | High-quality steel filter discs cover a wide fineness range for different materials and contamination levels. |
| Low melt pressure | Supports stable filtration conditions and contributes to longer filter-disc service life. |
| Separate speed-controlled drives | The filter discs and discharge screw are controlled independently to match process requirements. |
| Interchangeable screen sizes | Freely selectable screen sizes are matched to material throughput, contamination level and required filtration fineness. |
| High throughput | Up to 4,000 kg/h, depending on CDF configuration, polymer viscosity, contamination level and required filtration fineness. |
| Easy maintenance | Quick and effective scraper exchange without line downtime. |
| Spare parts availability | Knives, filter surfaces and complete replacement packages are available directly from MAS. |
What Our Customers Say
The Twin Screw Extruder from MAS is an engineering feat in the field of plastics recycling. Coupled with the superb performance of the Continuous Disc Filtration easily makes it the best recycling system in the world.
Wilson Pandhika, Director – PANERA Group
We always have to try to buy as good as possible to produce top quality regranulate. And we do that with the technology we bought from MAS.
Peter Daalder, CEO – Daly Plastics (NL)
Fatra was satisfied with the MAS cooperation, the possibility of tests before ordering, MAS innovative solutions and the final production performance achieved.
Ing. Jan Jedovnický, Fatra
Related Technologies
Twin-Screw Extruder
The conical co-rotating twin-screw extruder that feeds melt into the CDF filtration stage.
Upgrade Line
Retrofit and upgrade concept for improving granulate quality on existing extrusion lines.
MAS 110
The large-scale MAS extruder for higher throughput in recycling and compounding lines.
DRD Dry Cleaning
Water-free cleaning and drying technology for material preparation before extrusion.
Twin-Compound Line
Compounding technology for flexible formulations and difficult-to-feed additives.
Get The Right CDF Melt Filtration Setup For Your Material
Send polymer, contaminant profile, current screen-change data, throughput, pressure history and output target. MAS can compare CDF with upstream cleaning or simpler filtration.
