Injection Molding
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PC/ABS burnt
Problembeschreibung
Black specks and yellow streaks appear at the end of the flow.
Ursachenanalyse
Injection speed too fast or poor venting, air adiabatically compressed burns the melt; too high melt temperature also directly degrades.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Lösung
①Reduce injection speed; ②improve mold venting; ③reduce melt temperature; ④clean vent grooves.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
For PC/ABS burnt, first reduce speed then check venting; speed is the fastest effective adjustment.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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