Processing Machinery
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POM screw cleaning
Problem Phenomenon
Black specks and odor appear for a long time after POM material change
Cause Analysis
POM residual material resides and degrades in screw dead corners, and the decomposition products continuously contaminate; 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 data and should be confirmed first during troubleshooting
Solution
Clean thoroughly with HDPE or purging material during material change; disassemble and clean the screw regularly; empty before shutdown; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM material-change cleaning must be thorough, and dead-corner disassembly cleaning must be done regularly; 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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