Molding Process
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EVOH Processing Temperature Fluctuation
Problem Phenomenon
During EVOH processing, temperature fluctuates ±5-8°C, exceeding ±2°C control precision
Cause Analysis
PID parameters of temperature control system improper; heater bands aged with uneven power; thermocouple position improper, measurement deviation
Solution
1) Re-tune PID parameters; 2) Replace aged heater bands; 3) Adjust thermocouple position to the melt pool center
Key Takeaway
Temperature fluctuation is caused by improper temperature control system; PID tuning and heater band replacement are key
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