Choosing the right extruder gearbox is critical for ensuring stable operation, high production efficiency and long service life of plastic extrusion equipment. Different extrusion applications require different gearbox designs based on screw type, output torque, speed ratio, material characteristics and production requirements.
As a professional industrial gearbox supplier, we provide customized transmission solutions for various plastic extrusion machines.
Application of Single Screw Extruders
A single screw extruder gearbox is mainly used for plastic extrusion processes requiring continuous melting, mixing and conveying.
Typical applications include:
- Plastic pipes production
- Plastic profiles extrusion
- Plastic sheets and plates production
- Film extrusion
- Wire and cable extrusion
- Recycling extrusion lines
Common processing materials:
- PE (Polyethylene)
- PP (Polypropylene)
- PVC
- ABS
- PET
- Other thermoplastic materials
Key Parameters for Single Screw Extruder Gearbox Selection
1. Screw Diameter
The screw diameter directly affects extrusion output and required torque.
Common sizes:
- 30mm-90mm for small extrusion machines
- 90mm-200mm for medium and large extrusion lines
- 200mm+ for heavy-duty extrusion applications
A larger screw diameter usually requires a gearbox with:
- Higher output torque
- Stronger load capacity
- Larger bearing capacity
2. Motor Power
The gearbox should be selected according to the motor power of the extruder.
Typical power range:
- Small extruders: 5.5kW-45kW
- Medium extruders: 45kW-160kW
- Large extruders: 160kW and above
The gearbox must provide sufficient torque to ensure smooth extrusion operation.
3. Output Torque Requirement
Torque is one of the most important factors for selecting an extruder gearbox.
High torque gearbox designs are recommended for:
- High filling materials
- High pressure extrusion
- Large diameter pipes
- Heavy-duty plastic processing
4. Speed Ratio
The gearbox reduction ratio should match the required screw speed.
Common extrusion gearbox ratios:
- 8:1
- 10:1
- 12.5:1
- 16:1
- 20：1
- Customized ratios available
Information Required for Extruder Gearbox Selection
Extruder Information
✔ Extruder type
✔ Screw diameter
✔ Screw speed
✔ Motor power
✔ Output capacity
✔ Processing material
Gearbox Requirements
✔ Required torque
✔ Reduction ratio
✔ Installation dimensions
✔ Output shaft design
✔ Operating conditions