Molds & Tooling
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PA6 Hot Runner Temperature Setting
Problembeschreibung
When producing PA6 with a hot runner mold, yellowing and stringing repeatedly appear near the gate
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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