Molds & Tooling
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PCABS Black Specks and Mixed Spots
Problem Phenomenon
[Problem Phenomenon] PC/ABS light-colored products have black specks that recur after cleaning
Cause Analysis
Carbonization in barrel dead corners, hot runner material accumulation, regrind contamination, and incomplete cleaning during material change; PC phase degradation carbides are stubborn; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Clean the barrel and hot runner and check dead corners; regrind cleanliness management; thorough displacement during material change; 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 black specks, check dead corners and regrind; cleaning must be thorough; 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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