Water Ring Pelletizer
Water Ring Pelletizing System for Plastic Recycling & Extrusion Lines
A water ring pelletizing system is used to convert molten thermoplastics into uniform pellets through die-face cutting and immediate water cooling. It is commonly applied in plastic recycling and extrusion lines where material conditions can change during operation.
Compared with strand pelletizing, it removes strand handling and reduces interruptions caused by strand breakage or manual adjustment.
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Application Scope
This system is used in recycling and compounding lines where input materials are not always consistent.
Typical applications include:
PE film recycling after washing
01
PP woven bag reprocessing
02
HDPE / LDPE bottle flakes recycling
03
Plastic scrap from injection and extrusion processes
04
Mixed recycled plastics with moderate contamination
05
Working Process
The system works through direct die-face cutting with water cooling at the cutting zone.
Process flow:
Molten polymer exits the die head
Rotating cutter cuts material at the die surface
Water ring cools pellets immediately after cutting
Pellet and water mixture is sent to separation unit
Water is removed by centrifugal drying and vibration screening
Operation Behavior in Real Production
In recycling plants, pelletizing results are influenced by normal production variations, such as:
Changes in melt viscosity from recycled feedstock
Uneven feeding from washing or dosing systems
Pressure fluctuation during long running operation
Gradual blade wear affecting pellet shape
These are common conditions in industrial recycling, especially when processing post-consumer plastics.
Operators usually adjust process conditions such as cutter speed, die temperature, and extrusion rate to keep pellet quality within required range.
Key Characteristics
Stable pellet output under
Small changes in material behavior can be managed through basic process adjustments during operation.
Reduced production interruptions
The system does not require strand handling, which avoids stoppages caused by strand break
Suitable for continuous production
It is commonly used in recycling and compounding lines that run for long production cycles with minimal downtime.
Controlled fine particle level
Immediate water cooling helps maintain pellet shape and reduces dust generation during downstream handling.
Maintenance-fri
The cutter unit is designed for quick blade replacement without full disassembly, reducing downtime during maintenance.
Comparison of Pelletizing Methods
|
System |
Characteristics |
Limitations |
Typical Use |
|
Wa |
Stable operation, balanced cost |
Not for ultra-high precision polymers |
Recycling and compounding |
|
Strand Pelletizing |
Low |
Sensitive to strand |
Clean materials, small capacity |
|
Underwater Pelletizing |
High pellet uniformity |
Higher investment and system complexity |
Engineering plastics |
Technical Par
Capacity:
100 – 2000 kg/h (depends on material and extruder)
Pellet size:
Approx. 2–5 mm (adjustable by cutter speed and die design)
Cutting system:
Die-face rotary cutter
Cooling system:
Water ring circulation
Drying system:
Centrifugal dryer + vibration screen
Control:
Frequency-controlled drive system
System Configuration
A typical system in
Single or twin screw extruder
1
>>
Die-face pelletizer
2
>>
Water ring cutting chamber
3
>>
Pellet-water separation tank
4
>>
Centrifugal drying unit
5
>>
Vibration screening unit
6
>>
Water circulation system
7
Material Adaptability
The system can process common therm
- Po
- Polypropylene (PP)
- Polystyrene (PS)
- ABS under stable melt conditions
- Mixed recycled plastics (with parameter adjustment)
We provide support during system selection and commissioning, including:
Layout suggestions based
Integration with washing or extrusion systems
Process adjustment during startup
Spare parts supply
Remote technical support when required
Typical Applications
PP woven bag recycling lines in Europe
HDPE bottle washing and pelletizing systems
Industrial plastic scrap recycling plants
Plastic compounding production lines
Integrated washing and extrusion systems
FAQ
We're well-known as one of the leading water ring pelletizer manufacturers and suppliers in China since 1988, featured by quality products and low price. Please feel free to wholesale cheap water ring pelletizer for sale here from our factory. We also accept customized orders.