Molds & Tooling
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POM Drool Contamination
Problem Phenomenon
Oxidized streaks appear on POM part surfaces
Cause Analysis
Nozzle drool oxidizes and is carried into the cavity in the next shot, forming streaks; 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
Suck-back; valve gate nozzle; promptly clean drooled material; 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
Drooled material must be cleaned immediately to prevent mixing into parts; 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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