Material Drying
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Bubbles and silver streaks caused by improper POM drying
Fenómeno del problema
In humid seasons, bubbles and silver streaks on products break out intensively; the moisture content of the pellets was detected to exceed the standard, and it recovered after strengthened drying.
Análisis de la causa
Although POM is not strongly hygroscopic, its surface still adsorbs moisture, and storage in a high-humidity environment makes the moisture content exceed the standard; water vaporizes during melting to form bubbles and surface silver streaks.；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Dry the pellets at 80~90°C for 3~4 hours; ②keep sealed packaging and open only when used; ③strengthen drying monitoring in humid seasons; ④test the moisture content.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Although POM's drying requirements are lower than those of PA and PET, standardized drying is still required in humid environments; seasonal defect outbreaks often correspond to humidity changes.；After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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