Injection Molding
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Barrel Temperature Control Failure of Polypropylene '2079851475616104452 Machine
Problem Phenomenon
The actual barrel temperature deviates greatly from the set value, and the temperature fluctuates or goes out of control.
Temperature control failure leads to unstable melt quality, possibly causing material degradation or poor plasticization, seriously affecting product quality.
Cause Analysis
(1) The thermocouple is damaged or installed in an improper position, and the temperature measurement is inaccurate
(2) The heating band is aged or 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 overheated barrel cannot dissipate heat in time
Solution
(1) Check and replace the damaged thermocouple to ensure correct installation position and good contact
(2) Check the heating bands, replace aged or damaged ones in time, and ensure uniform heating
(3) Calibrate the temperature control instrument, optimize the PID parameters, with a control precision of ±2°C
(4) Keep the barrel insulation cover intact to ensure the temperature of each section is stable within the range of 200-280°C
(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 thermocouple, heating bands, and temperature control instrument need to be systematically checked.
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