How to set the temperature of the 10 zones of a twin screw extruder

The temperature setting of a twin screw extruder usually follows a certain pattern to ensure that the material is properly treated at each stage of processing. Generally speaking, the temperature setting of a twin screw extruder can be divided into the following zones, each with its own specific temperature range and purpose:

‌Feeding zone: The temperature is usually between 150-180°C. The main purpose of this zone is to preheat the material so that it can smoothly enter the subsequent processing stage.

‌Compression zone: The temperature is slightly higher than the feeding zone, about 180-200°C. This zone further plasticizes the material by increasing pressure and temperature.

‌Melt zone: The temperature is higher, generally between 200-230°C. This zone is the key area for the complete melting of the material, ensuring that the material is melted evenly.

‌Homogenization zone: The temperature is usually between 220-240°C. This zone ensures that the material is fully mixed and evenly mixed through high temperature and shear force.

The specific temperature setting needs to be adjusted according to the type of plastic being processed, the screw speed, and other parameters in the production process.

For example, for the processing of high-density polyethylene (‌HDPE), the temperature settings of each zone may be:

Barrel zone 1: 155±5°C

Barrel zone 2: 160±5°C

Barrel zone 3: 165±5°C

Barrel zone 4: 170±5°C

Barrel zone 5: 175±5°C

Barrel zone 6: 180±5°C

Barrel zone 7: 180±5°C

Barrel zone 8: 190±5°C

Barrel zone 9: 195±5°C

Digit: 200±5°C

These temperature settings not only affect the extrusion process of the material, but also directly affect the performance of the final product. Therefore, in actual operation, appropriate adjustments need to be made according to specific process requirements and equipment performance.