Processing Machinery
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Metallocene linear low density polyethylene metallocene linear low density polyethylene large barrel temperature fluctuations during processing（Variant: Color/Material Change Scenario）
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.In particular, when changing materials or colors, this problem is more prominent and requires key attention.
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\
（6） When changing materials or colors, process parameter fluctuations or equipment status changes aggravate this problem
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\
（6） And do well in cleaning the transition material, paying special attention to parameter stability when changing materials or colors
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.Targeted preventive measures need to be taken in different production scenarios.
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