There are mainly the following four ways:
1. Granulation by double-roll mill: raw materials → batching → high-speed mixer → internal mixer → double-roll mill → cooling water tank → drying → granulator → screening and magnetic separation → metering → packaging.
2. Granulation by single screw extruder: raw materials → batching → high-speed mixer → cooling mixer → single screw extruder → hot cutting head → air cooling → screening and magnetic separation → metering → packaging.
3. Granulation by two-stage extruder (first-stage twin-screw extruder and second-stage single-screw extruder): raw materials → batching → high-speed mixer → cooling mixer → second-stage extruder → hot cutting head → air cooling → screening and magnetic separation → metering → packaging.
4. Granulation by twin-screw extruder: raw materials → batching → high-speed mixer → cooling mixer → twin-screw extruder → hot cutting head → air cooling → screening and magnetic separation → metering → packaging.