Injection Molding
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Barrel temperature control failure of low density polyethylene injection machine
Problem Phenomenon
The actual barrel temperature deviates greatly from the set value, with temperature fluctuation or loss of control.
Temperature control failure causes unstable melt quality, possible material degradation or poor plasticization, seriously affecting product quality.
Cause Analysis
(1) Thermocouple damaged or improperly installed, inaccurate temperature measurement
(2) Heater band aged and damaged, insufficient or uneven heating power
(3) Temperature controller failure, improper PID parameter settings
(4) Uneven barrel heat dissipation, large local heat loss
(5) Cooling fan failure; overheated barrel cannot dissipate heat in time
Solution
(1) Check and replace damaged thermocouples, ensure correct installation position and good contact
(2) Check heater bands; promptly replace aged or damaged ones, ensure uniform heating
(3) Calibrate the temperature controller, optimize PID parameters, control accuracy ±2°C
(4) Keep barrel insulation cover intact, ensure stable temperature of each zone within the 160-220°C range
(5) Check cooling fans, ensure the heat dissipation system works normally
Key Takeaway
Temperature control failure is caused by sensor or heater failure; thermocouples, heater bands, and temperature controllers need to be systematically checked.
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