Extrusion & Post
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LLDPE extrusion melt temperature drift
Problem Phenomenon
Melt temperature fluctuations cause bubble and thickness fluctuations.
Cause Analysis
LLDPE shear heating is significant; screw speed fluctuations directly convert into melt temperature fluctuations; temperature control detuning is superimposed.
Solution
①Stabilize screw speed; ②PID tuning; ③check heater bands and thermocouples; ④optimize screw configuration to reduce shear heat.
Key Takeaway
Melt temperature drift = shear heat + control detuning.
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