Material Drying
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POM Bubble
Fenómeno del problema
Bubbles inside or on the surface of POM parts
Análisis de la causa
Excessive moisture or air entrained in the melt; at thick walls it may also be shrinkage voids; 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
Measure moisture content; treat thick-wall bubbles as shrinkage voids with added holding pressure; treat thin-wall ones as venting issues; 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
Distinguish moisture, entrained air, and shrinkage voids by bubble position and form; 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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