Molds & Tooling
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PC Black Specks Thermal Decomposition
Problem Phenomenon
[Problem Phenomenon] Black specks on light-colored PC products, recurring after cleaning
Cause Analysis
Carbonization in barrel dead corners, hot runner material buildup, regrind contamination, degradation above 320°C; black specks are stubborn; 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
Clean the barrel and hot runner and check dead corners; clean regrind; melt temperature ≤320°C; 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 black specks, check dead corners and regrind; degradation above 320°C is the root; 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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