Air Cooling Strand Pelletizing Systems - Detailed Technical Description & Features
The Air Cooling Strand Pelletizing System is an air-cooled strand-type granulation solution designed for most polymer compounding applications, operating without any water contact during the cooling phase.
This technology is widely preferred in high-efficiency production lines thanks to its simple mechanical structure, ease of operation, and low maintenance requirements. It minimizes operator training needs and provides an optimal solution for resins where water contact may negatively affect material properties.
The system consists of core components such as the strand die, air cooling conveyor, strand pelletizer, and vibrating classifier. The entire production process operates as an integrated system with high-precision conveying and cutting control.
System Components & Technical Specifications
1. Extrusion Die Plate (Strand Die Plate)
• Material: 38CrMoAlA nitrided heat-treated high-strength steel
• Replaceable die plate: Standard configuration with 4 mm strand diameter and 17 holes
• Integrated heating system ensures stable melt flow
• Quick die plate replacement and maintenance minimize process downtime
2. Air Cooling Conveyor
• Length: Approximately 20 meters, suitable for large-scale production lines
• Width: 350 mm
• Speed control: Adjustable via AC inverter
• Belt/screen material: SUS304 stainless steel
• The extended conveyor length enables rapid and controlled strand cooling, ensuring synchronized feeding into the pelletizing unit
3. Strand Pelletizer (KF230)
• Model: KF230
• Motor power: 11 kW
• Speed control: AC inverter controlled
• Maximum strand capacity: 30 strands (4 mm diameter)
• Strand processing speed: 30 - 50 m/min
• Rotating and fixed cutting blades made from hardened alloy steel
• Rotor width: 230 mm
• High-quality PU upper feeding rollers ensure stable strand movement
4. Vibrating Classifier (YL-500)
• Model: YL-500
• Vibration motor capacity: 2 × 0.08 kW
• Processing capacity: Approximately 500 kg/h
• Screen material: SUS304 stainless steel
• Dual-layer screening structure:
- Upper layer: 6 mm perforation
- Lower layer: 20 mesh screen
• Three discharge outlets for oversized pellets, standard pellets, and fines
Supporting Systems
5. Conveying & Storage
• Pneumatic conveying system: 4 kW blower for high-flow pellet transfer
• Pipeline material: Stainless steel for long service life
• Storage silo capacity: 2000 L
• Modular detachable frame structure for easy installation and maintenance
Working Principle - Step-by-Step Technical Flow
Feeding & Melting
Plastic resin or compound raw material is fed into the extruder and melted.
Die Plate Exit
The molten polymer exits through the strand die plate and is directed onto the air cooling conveyor.
Air Cooling
Strands are cooled by ambient air as they travel along the 20-meter conveyor. This is particularly advantageous for materials sensitive to moisture or water contact.
Strand Pelletizing
The cooled strands are automatically transferred to the pelletizer and cut into pellets of the desired length.
Vibrating Classification
Cut pellets are separated by size through the vibrating classifier, ensuring consistent product quality.
Technical Advantages & Performance Benefits
The Air Cooling Strand Pelletizing System provides the following technical advantages:
• No water contact: Ideal for moisture-sensitive resins and masterbatch or highly filled compounds
• Simple and robust structure: Eliminates the need for complex hydraulic systems, reducing operating costs
• Low operator skill requirement: User-friendly design simplifies training and operation
• Wide material compatibility: Suitable for PP-based degradable resins, WPC, masterbatch, LLDPE, PVC, and other polymers
• Rapid cooling & flow control: The 20-meter conveyor ensures efficient strand cooling and stable transfer to the pelletizer
Application Areas & Use Cases
The Air Cooling Strand Pelletizing System is suitable for:
• PP-based filled and degradable resin pellet lines
• Wood-Plastic Composite (WPC) granule production
• PVC and LLDPE resin processing
• Masterbatch and highly filled compound lines
• Granulation processes where water contact must be avoided
The Air Cooling Strand Pelletizing System is an efficient and cost-effective pellet production solution designed to prevent water contact through its air-based cooling architecture.
This air-cooled granulation technology ensures high-quality and stable pellet output, especially in applications where water exposure may compromise resin performance.
With its flexible component configuration and adaptable processing parameters, the system plays a critical role in modern plastic compounding and manufacturing facilities, delivering consistent performance and reliable production efficiency.
