Molds & Tooling
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PCABS Burnt Marks
Problem Phenomenon
[Problem Phenomenon] PC/ABS end ribs are burnt and blackened, accompanied by odor
Cause Analysis
Trapped gas is adiabatically compressed, heated up, and burnt; poor venting combined with high melt temperature; the PC phase is sensitive to high temperature and more easily burnt; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Strengthen end venting; reduce end-stage injection speed; adjust back when melt temperature is near the upper limit; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For PC/ABS burning, first improve venting and then reduce end-stage speed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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