Based on the previous focus on the adverse consequences of hot runner overheating, such as material thermal degradation and molding defects, and the relevant background of rapid cooling remediation after overheating, the following standardized procedures can be used to adjust the hot runner temperature to avoid overheating:
Precisely Set Initial Temperature Zone: Strictly match the initial temperature zone to the safe processing range of the plastic used. For heat-sensitive materials (PVC/POM), control the temperature below the thermal degradation threshold. The gate area should only be 5-10°C higher than the main runner body; avoid blindly setting a uniform high temperature.
Use Closed-Loop Temperature Control System: Employ a PID dynamic temperature control mode to keep temperature fluctuations within ±1°C, preventing continuous overheating. Regularly calibrate the temperature sensor to prevent temperature drift.
Set Overheat Warning Threshold: Set an upper temperature limit alarm in the temperature control chamber. Once the actual temperature exceeds the safe range, the alarm will be triggered immediately, and the heating power will be simultaneously cut off, preventing the temperature from continuously rising at the source.
Auxiliary Cooling: Reserve a fan-cooling interface on the outside of the manifold. In case of abnormal temperature, auxiliary cooling can be quickly activated to prevent heat accumulation and overheating. This set of operations can avoid the risk of excessively high hot runner temperatures throughout the entire process of setup, monitoring, and emergency response.
