Water Cooling Strand Pelletizing Systems - Strand (Spaghetti) Cutting Technology
The Water Cooling Strand Pelletizing System is a water-cooled strand-type granulation technology designed for modern polymer compounding production.
This system is widely preferred in high-performance production lines thanks to its simple mechanical structure, user-friendly operation, and ease of maintenance. It offers a low learning curve for operators, enabling high-capacity production without the need for complex automation systems.
System Structure & Main Components
A typical Water Cooling Strand Pelletizing line consists of the following key equipment:
1. Strand Die Plate
Material: 38CrMoAlA nitrided heat-treated steel
Output Options: Multiple hole configurations starting from 4 mm strand diameter (e.g., 2, 3, 5, 9, 13, 17, 21, 25, 27, 31 holes)
Design Feature: Fast-open die plate design allows screen change within approximately 2 minutes
Heating: Integrated electric heating system ensures stable melt flow and uniform strand formation
2. Water Cooling Bath
Body Material: Stainless steel construction for durability and long service life
Mobility: Equipped with wheels for easy repositioning
Available Dimensions:
• 2m x 300mm x 300mm
• 3m x 300mm x 300mm
• 4m x 400mm x 350mm
• 5m x 400mm x 350mm
• 6m x 450mm x 400mm
The extended bath length can be optimized according to extrusion speed and production capacity to ensure sufficient cooling time.
3. Water Wiper Unit
The system can be configured with two types of water removal units:
Blowing Type
• Fan power range: 0.75 kW → 3 kW
• Removes residual water by high-pressure air blowing
Vacuum Type
• Vacuum fan power: 1.5 kW → 3 kW
• Collects water into a single stainless steel tank
All material-contact parts are manufactured from stainless steel to minimize contamination risk.
4. Strand Pelletizer
USEON offers more than 10 different strand pelletizer models within this system range.
Pelletizer selection depends on line speed and pellet diameter tolerance requirements. Standard configurations are designed to handle strand diameters starting from 4 mm up to high-output industrial production capacities.
5. Vibrating Classifier
The vibrating classifier separates pellets by size and removes fines or broken particles.
More than 13 classifier configurations are available to match different production capacities, ensuring consistent pellet quality.
6. Conveying & Storage Systems
The complete line may include automatic conveying and storage systems:
Conveying Blower
• Motor options: 3 kW → 5 kW
• Stainless steel pipeline system for pellet transfer
Silo Capacities
• 1000 L
• 2000 L
• 2500 L
All manufactured in stainless steel
Frame
• Modular and detachable structure for easy installation and maintenance
Working Principle & Technical Flow
In the Water Cooling Strand Pelletizing process, molten polymer exits the extruder and passes through the strand die plate.
The molten strands enter a precisely controlled water bath where the strand surface is rapidly cooled through direct water contact. Keeping the strand submerged rather than exposed to atmospheric cooling improves dimensional stability.
After cooling, strands pass through either an air knife (blowing type) or vacuum water removal unit to eliminate surface moisture.
The dried strands are then cut by the strand pelletizer and finally classified by a vibrating screen to ensure consistent pellet size.
Process Advantages
This controlled process flow ensures:
• Surface tension stabilization of thermoplastic resin
• Minimal residual moisture
• Homogeneous pellet size distribution
• Stable cutting quality at high production speeds
Technical Specifications & Performance Parameters
The Water Cooling Strand Pelletizing System is designed for flexible configuration and a wide production range.
Strand Die Plate Hole Options
• 2, 3, 5, 9, 13, 17, 21, 25, 27, 31 holes
These configurations allow adaptation to different pellet diameters and line speeds.
Cooling Bath Length Options
• 2-6 meters
Optimized cooling time according to extrusion throughput.
Water Removal Fan Capacity
• 0.75 kW → 3 kW (Blowing Type)
• 1.5 kW → 3 kW (Vacuum Type)
Conveying Motor Power
• 3 kW → 5 kW
Silo Storage Capacity
• 1000 L - 2000 L - 2500 L stainless steel silos
These options allow adaptation from pilot-scale compounding lines to large-scale industrial production systems.
Application Areas & Production Capabilities
The Water Cooling Strand Pelletizing System is suitable for:
• Polyolefin (PE / PP / PS) granule production
• Masterbatch compounding lines
• Elastomer compounds (TPE / TPV / EVA)
• Engineering plastics
• PVC and filler-loaded compounds
• Textile, film, pipe, and molding applications
The system is engineered to maintain stable pellet quality at high output speeds. Its flexible die plate configurations allow adaptation to various product sizes and material formulations.
Advantages of Water Cooling Strand Pelletizing
• Simple and robust mechanical structure
• Easy maintenance and low operator skill requirement
• Flexible production through multiple die plate configurations
• Fast screen change design (approx. 2 minutes)
• Stainless steel water bath and frame for high hygiene standards
• Extended cooling bath options for improved heat dissipation
The Water Cooling Strand Pelletizing System is a powerful, flexible, and cost-efficient granulation solution for polymer compounding production lines.
Water-cooled strand technology plays a critical role in modern plastic manufacturing facilities thanks to its high line efficiency, wide production range, and process stability.
This system delivers reliable performance across masterbatch production, engineering plastics, and general polymer compounding applications.
With high-quality strand pellets, manufacturers achieve improved production continuity, reduced downtime, and enhanced overall process performance.
