Processing Machinery
2 views
Large barrel temperature fluctuation during processing of general-purpose polyethylene general-purpose polyethylene
Problem Phenomenon
The actual temperature of each section of the barrel deviates greatly from the set value, and the melt quality fluctuates.
Temperature fluctuation leads to unstable product dimensions, appearance, and mechanical properties.
Cause Analysis
（1）The heater band is aging, resulting in insufficient or uneven heating power
（2）The thermocouple is damaged or improperly installed, and the temperature measurement is inaccurate
（3）The PID parameters of the temperature controller are improperly set
（4）The cooling fan is faulty, causing the barrel to overheat
（5）The large ambient temperature change affects the temperature control accuracy
Solution
（1）Check and replace the aged heater bands to ensure uniform heating of each section
（2）Check the position and integrity of the thermocouples, and replace the damaged ones
（3）Optimize the PID parameters of the temperature controller, control accuracy ±2°C
（4）Ensure that the cooling fan works normally, and install air conditioning to maintain the ambient temperature if necessary
（5）Install an insulation cover to reduce heat loss
Key Takeaway
Barrel temperature fluctuation is caused by heating or temperature control system faults, and the heater bands, thermocouples, and temperature controllers need to be regularly checked and maintained.
Was this helpful?
0 people found this helpful
Thank you for your feedback!