Material Drying
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Necessity of POM drying
Problem Phenomenon
Because POM is nominally low water absorption, the drying process was omitted, and silver streaks and bubbles appeared on the products
Cause Analysis
Although POM has a low water absorption rate (about 0.2-0.25%), the surface still adsorbs moisture after the package is opened, and POM melt is sensitive to moisture, so even trace moisture can cause silver streaks
Solution
Dry POM at 80-100°C for 2-3 hours before molding; sealed packages opened and used immediately may skip drying, but opened and exposed material must be dried; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low water absorption does not mean drying-free; opened and exposed material must be baked dry; 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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