Injection Molding
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PC/ABS burnt
Problem Phenomenon
Black specks and yellow streaks appear at the end of the flow.
Cause Analysis
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
Solution
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
Key Takeaway
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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