|
Material Classification |
Representative Material |
Core Thermal Properties |
Recommended Heating Rate |
Supporting Control Requirements |
|
High Heat-Resistant and Stable General-Purpose Materials |
PP, PE, ABS, PS |
Thermal decomposition temperature is much higher than the conventional processing temperature; short-term overheating poses no significant degradation risk |
3~4℃/min |
100% full power output allowed throughout; temperature checked every 20 minutes. |
|
Medium Heat-Resistant Engineering Materials |
PC, PA6, PA66, PMMA |
Overheating or prolonged exposure to high temperatures will cause molecular chain breakage and performance degradation |
2~3℃/min |
Power limited to 80% after 100℃; temperature checked every 10 minutes. |
|
Highly Degradable and Sensitive Materials |
PVC, POM, PET, TPU |
Low degradation trigger temperature; rapid decomposition occurs with short-term overheating, potentially posing safety risks |
1~1.5℃/min |
Power limited to 60%~70% throughout; temperature checked every 5 minutes after exceeding the safety threshold. |
|
High Viscosity and High-Filling Materials |
PP with added mineral powder, high-filler PA |
High melt viscosity and rapid heating can easily lead to uneven heating within the flow channel and poor filling dispersion |
1.5~2℃/min |
Increase the heating rate by 20% above or below the base value and extend the holding time in the mid-temperature range. |
|
Glass fiber reinforced materials |
GF-PP, GF-PA66, GF-PET |
Glass fiber itself has no risk of thermal degradation and its thermal stability is superior to pure resin |
2.5~3.5℃/min |
Increase the heating rate by 10% above the base value; no additional rate reduction control is required. |
|
Transparent optical grade materials |
optical grade PC, optical grade PMMA |
Extremely high requirements for temperature uniformity; local temperature differences can easily cause poor light transmission and stress marks |
1~2℃/min |
Increase the heating rate by 30% above or below the base value; control the temperature difference throughout the flow channel within ±2℃. |
Supplementary adaptation rules: In high-humidity, rainy environments, the heating rate of all materials should be reduced by 20% from the recommended values in the table, and an additional 10 minutes of dehumidification and heat preservation should be added at the 100℃ stage.
For ultra-large multi-cavity hot runners with 64 cavities or more, the heating rate of all materials should be reduced by 30% from the recommended values in the table to avoid excessive temperature differences between the inside and outside of the large-mass runner plate, which could lead to thermal deformation.
If the hot runner has previously experienced an over-temperature alarm, the heating rate of all materials should be reduced by 50%, and gradually restored to the standard rate after confirming that the temperature has completely stabilized.
