Processing Machinery
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POM copper contact taboo
Problem Phenomenon
After the POM melt contacts a copper nozzle, the products discolor and embrittle
Cause Analysis
Copper ions catalyze POM degradation, and copper-containing alloy parts in contact with the melt accelerate decomposition; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Avoid copper alloys for parts in contact with the melt; use plated or steel parts; clean immediately after contamination; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Copper is a POM degradation catalyst, and component materials must avoid it; after confirming effectiveness, fix 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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