Molds & Tooling
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POM Drool Contamination
Fenómeno del problema
Oxidized streaks appear on POM part surfaces
Análisis de la causa
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
Solución
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
Conclusión clave
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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