Processing Machinery
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Large barrel temperature fluctuation during linear low-density polyethylene linear low-density polyethylene processing
Problembeschreibung
The actual temperature of each barrel section deviates greatly from the set value, and melt quality fluctuates.
Temperature fluctuation causes instability in product dimensions, appearance and mechanical properties.
Ursachenanalyse
(1) Aging of heating bands leads to insufficient or uneven heating power
(2) Thermocouples are damaged or improperly installed, resulting in 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
Lösung
(1) Check and replace aged heating bands to ensure uniform heating in each section
(2) Check thermocouple position and integrity, and replace damaged ones
(3) Optimize PID parameters of the temperature control instrument, with control accuracy of ±2°C
(4) Ensure the cooling fan works properly, and install air conditioning if necessary to maintain ambient temperature
(5) Install insulation covers to reduce heat loss
Wichtigste Erkenntnis
Barrel temperature fluctuation is caused by heating or temperature control system failures; heating bands, thermocouples and temperature control instruments need regular inspection and maintenance.
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