Molds & Tooling
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PA6 Hot Runner Temperature Setting
Fenómeno del problema
When producing PA6 with a hot runner mold, yellowing and stringing repeatedly appear near the gate
Análisis de la causa
When the hot runner temperature is set too high, PA6 is heated and degraded in the runner for a long time and yellows; when the temperature is uneven, local overheating produces stringing; PA6 is more sensitive to the hot runner temperature window than general-purpose materials
Solución
Hot runner temperature is set at 250-260°C according to the lower limit of the melt temperature, and the temperature difference at each point is controlled within ±5°C; when shutdown exceeds 20 minutes, lower the hot runner temperature to prevent residence degradation
Conclusión clave
PA6 hot runner temperature should be low rather than high, and uniformity and anti-residence are equally important; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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