Molds & Tooling
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PC Trapped Air Burning
Problem Phenomenon
[Problem Phenomenon] PC end rib areas are burnt and blackened, with a peculiar smell
Cause Analysis
Trapped air is adiabatically compressed, heated and burnt; PC is sensitive to high temperature and more prone to burning; poor venting combined with high melt temperature superimposes; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solution
Strengthen venting at the end; reduce the final-stage injection speed; adjust the melt temperature back from the upper limit; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
For PC burning, first clear the venting; high-temperature materials fear trapped air more; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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