Processing Machinery
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Large Barrel Temperature Fluctuation During Processing of High-Density Polyethylene High-Density Polyethylene
Problem Phenomenon
The actual temperature of each barrel section deviates greatly from the set value, and the melt quality fluctuates.
Temperature fluctuation causes instability in product dimensions, appearance, and mechanical properties.
Cause Analysis
（1）Aging of the heating rings leads to 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 control instrument are set improperly
（4）Cooling fan failure causes the barrel to overheat
（5）Large environmental temperature changes affect the temperature control accuracy
Solution
（1）Check and replace aged heating rings to ensure uniform heating of each section
（2）Check the position and integrity of the thermocouples, and replace damaged ones
（3）Optimize the PID parameters of the temperature control instrument, with a control accuracy of ±2°C
（4）Ensure the cooling fan works normally, and install air conditioning to maintain the environmental temperature when necessary
（5）Install insulation covers to reduce heat loss
Key Takeaway
Barrel temperature fluctuation is caused by heating or temperature control system faults, and the heating rings, thermocouples, and temperature control instruments need to be regularly checked and maintained.
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