Injection Molding
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Failure of Barrel Temperature Control in High-Density Polyethylene '2079851475616104452 Machine
Problem Phenomenon
The actual barrel temperature deviates greatly from the set value, and the temperature fluctuates or runs out of control.
Failure of temperature control leads to unstable melt quality, possible material degradation or poor plasticization, and seriously affects product quality.
Cause Analysis
（1）The thermocouple is damaged or installed in an improper position, and the temperature measurement is inaccurate
（2）The heating ring is aged and damaged, and the heating power is insufficient or uneven
（3）The temperature control instrument is faulty, and the PID parameters are set improperly
（4）The barrel heat dissipation is uneven, and the local heat loss is large
（5）The cooling fan is faulty, and the barrel overheats and cannot dissipate heat in time
Solution
（1）Check and replace the damaged thermocouple to ensure the installation position is correct and the contact is good
（2）Check the heating rings, and replace aged or damaged ones in time to ensure uniform heating
（3）Calibrate the temperature control instrument and optimize the PID parameters, with a control accuracy of ±2°C
（4）Keep the barrel insulation cover intact to ensure the temperature of each section is stable within the 180-260°C range
（5）Check the cooling fan to ensure the heat dissipation system works normally
Key Takeaway
Temperature control failure is caused by sensor or heater faults, and the thermocouples, heating rings, and temperature control instruments need to be systematically checked.
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