Injection Molding
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Barrel temperature control failure of random copolymer polypropylene injection machine
Fenómeno del problema
Actual barrel temperature deviates greatly from the set value, with temperature fluctuation or loss of control.
Temperature control failure causes unstable melt quality, possibly causing material degradation or poor plasticization, seriously affecting product quality.
Análisis de la causa
(1) The thermocouple is damaged or installed in an improper position, resulting in inaccurate temperature measurement
(2) Heating bands are aged or damaged, with insufficient or uneven heating power
(3) Temperature control instrument failure, with improper PID parameter settings
(4) Barrel heat dissipation is uneven, with large local heat loss
(5) Cooling fan failure; the barrel overheats and cannot dissipate heat in time
Solución
(1) Check and replace damaged thermocouples, ensuring correct installation position and good contact
(2) Check heating bands, replacing aged or damaged ones in time to ensure uniform heating
(3) Calibrate the temperature control instrument, optimizing PID parameters, with control accuracy of ±2°C
(4) Keep the barrel insulation cover intact, ensuring each section temperature is stable within the 190-260°C range
(5) Check the cooling fan to ensure the heat dissipation system works normally
Conclusión clave
Temperature control failure is caused by sensor or heater failures; thermocouples, heating bands and temperature control instruments need to be systematically checked.
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