Processing Machinery
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Metallocene linear low density polyethylene metallocene linear low density polyethylene large barrel temperature fluctuations during processing
Problem Phenomenon
The actual temperature of each barrel section deviates greatly from the set value, and the melt quality fluctuates.
Temperature fluctuations cause instability in product dimensions, appearance and mechanical properties.
Cause Analysis
（1） Aging of heater bands causes insufficient or uneven heating power\
（2） Thermocouple damaged or improperly installed, causing inaccurate temperature measurement\
（3） Improper PID parameter settings of the temperature control instrument\
（4） Cooling fan failure causes barrel overheating\
（5） Large ambient temperature changes affect temperature control accuracy
Solution
（1） Check and replace aged heater bands, ensure uniform heating of each section\
（2） Check thermocouple position and integrity, replace damaged ones\
（3） Optimize temperature control instrument PID parameters, control accuracy ±2°C\
（4） Ensure the cooling fan works normally, install air conditioning if necessary to maintain ambient temperature\
（5） Install insulation covers to reduce heat loss
Key Takeaway
Barrel temperature fluctuation is caused by heating or temperature control system failures, requiring regular inspection and maintenance of heater bands, thermocouples and temperature control instruments.
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