Molds & Tooling
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ASA Black Speck Carbonization Contamination
Problem Phenomenon
【Problem Phenomenon】Black specks scattered on ASA light-colored products, intermittently recurring after cleaning
Cause Analysis
Barrel dead-corner carbonized material peeling, hot runner accumulated material degradation, regrind contamination are the three major sources; long-term high-temperature operation aggravates carbonization; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Clean barrel and hot runner to check dead corners; regrind cleanliness management; disassemble and check screw check ring when black specks occur frequently; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA black specks check dead corners, hot runner, regrind, disassembly inspection is the last resort; 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 subsequent similar problems
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