Injection Molding
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Barrel temperature control failure of general-purpose polyethylene '2079851475616104452 machine
Problem Phenomenon
The actual barrel temperature deviates greatly from the set value, and the temperature fluctuates or is out of control.
Temperature control failure leads to unstable melt quality, may cause material degradation or poor plasticization, and seriously affects product quality.
Cause Analysis
（1）The thermocouple is damaged or the installation position is improper, and the temperature measurement is inaccurate
（2）The heater band is aged and damaged, and the heating power is insufficient or uneven
（3）The temperature controller is faulty, and the PID parameters are improperly set
（4）The barrel heat dissipation is uneven, and the local heat loss is large
（5）The cooling fan is faulty, and the barrel is overheated and cannot dissipate heat in time
Solution
（1）Check and replace the damaged thermocouple to ensure correct installation position and good contact
（2）Check the heater bands, replace the aged or damaged ones in time, and ensure uniform heating
（3）Calibrate the temperature controller, optimize the PID parameters, control accuracy ±2°C
（4）The barrel insulation cover is intact, ensuring that the temperature of each section is stable within the range of 160-260°C
（5）Check the cooling fan to ensure that the heat dissipation system works normally
Key Takeaway
Temperature control failure is caused by sensor or heater faults, and the thermocouple, heater band, and temperature controller need to be systematically checked.
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