Processing Machinery
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POM Black Speck
Problem Phenomenon
Black specks appear on light-colored POM parts
Cause Analysis
Carbonized material shedding from barrel dead spots or incomplete cleaning during material change; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Disassemble and clean the screw and nozzle; execute material change cleaning procedures; monitor black speck trends; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Radical cure of black specks relies on disassembly cleaning and cleaning procedures; after confirming effectiveness, solidify 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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