I. Single-Cavity/2-Cavity Small Hot Runner Parameter Adjustment
Heating Rate: Set to 3~4℃/min. The small mass runner plate has low thermal inertia, allowing for rapid heating without the risk of localized temperature differences.
Power Limit: 100% full power output is allowed throughout the entire process, without derating.
Holding Time: Hold at 100℃ for 10 minutes, hold at the lower limit of the processing temperature for 10 minutes, total heating time ≤ 45 minutes.
II. 4~8-Cavity Medium Hot Runner Parameter Adjustment
Heating Rate: Set to 2~3℃/min, suitable for the heat conduction rhythm of medium mass runner plates.
Power Limit: Full power output before 100℃, limited to 80% after 100℃ to avoid temperature overshoot and fluctuations.
Holding Time: Hold at 100℃ for 15 minutes, hold at the lower limit of the processing temperature for 15 minutes, total heating time ≤ 75 minutes.
III. Parameter Adjustment for Large Multi-Cavity Hot Runners (16-32 Cavities)
Heating Rate: Set to 1.5-2℃/min to avoid excessive temperature differences between the inside and outside of the large-mass runner plate, which could lead to thermal deformation.
Power Limit: Full power output before 120℃, then limited to 70% to ensure uniform temperature rise across the entire area.
Holding Time: 20 minutes at 120℃, 20 minutes at the lower limit of the processing temperature, total heating time ≤ 120 minutes.
IV. Parameter Adjustment for Ultra-Large Multi-Cavity Hot Runners (64 Cavities and Above)
Heating Rate: Set to 1-1.5℃/min to avoid localized hot spots in ultra-large runner plates.
Power Limit: Full power output before 120℃, then limited to 60% to prevent total power overload.
Holding Time: 30 minutes at 120℃, 30 minutes at the lower limit of the processing temperature, total heating time ≤ 180 minutes. V. Cross-Scenario Adjustment Rules For processing heat-stable general-purpose materials such as PP/PE, the heating rate of all cavities can be increased by 20%, and the holding time reduced by 30%.
For processing easily degradable sensitive materials such as PVC/POM, the heating rate of all cavities can be decreased by 30%, and the holding time increased by 50%, mitigating the risk of material degradation.
In high-humidity environments, all cavities will have an additional 10 minutes of holding time at 100℃ to ensure sufficient moisture removal and prevent hydrolytic degradation.
