What is the application principle of twin screw extruder?


The twin screw extruder was originally produced in food […]

The twin screw extruder was originally produced in food and plastic processing. In recent decades, its application range has continued to expand, and has expanded to rubber, paint, petrochemical fiber, building materials, pulp, food, feed processing and fluid machinery.

The auxiliary machines of the twin-screw extruder mainly include pay-off device, straightening device, preheating device, cooling device, traction device, meter counter, spark tester, and wire take-up device.

Twin screw extruder structure
The configuration of parallel twin-screw systems varies according to the field of application and operating characteristics. According to the direction of rotation, it is divided into counter-rotation and co-rotation. According to the meshing form, it is divided into meshing type and non-meshing type. In meshing type, it is divided into full meshing type and partial meshing type. The helix of one screw protrudes into the screw groove of the other screw like a wedge, and the material basically cannot be inherited from the screw groove into the adjacent screw groove, but can only be forced by the screw of one screw. The grooves flow into the grooves of the other screw. Because the screw continues to roll and repeatedly force the material to turn, the result is that the material is subjected to better shear mixing.

Twin screw extruder application
For cylindrical helical gears, counter-rotating twin screws and twin rotors, we can see that there is a great similarity in the meshing process, working principle, or processing and manufacturing. We do not look at the cylindrical helical gear as the lower level of the counter-rotating twin-screw, while the counter-rotating double rotor is a higher-level form of the counter-rotating twin-screw, both of which are driven by the driving member to rotate the driven member.

Twin screw extruder maintenance:
1. After 500 hours of use, there will be iron filings or other impurities in the gear box. Therefore, the gear should be cleaned and the gear box lubricating oil should be replaced.
2. After a period of use, a comprehensive inspection of the extruder should be carried out to check the tightness of all screws.
3. If there is a sudden power failure during production, the main drive and heating stop, when the power supply is restored, each section of the barrel must be reheated to the specified temperature and kept for a period of time before the extruder can be started.
4. If the steering fullness of the instrument and pointer is found, check whether the contact between the thermocouple and other side lines is good.