Material Drying
3 조회수
Necessity of POM drying
문제 현상
Because POM is nominally low water absorption, the drying process was omitted, and silver streaks and bubbles appeared on the products
원인 분석
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
해결 방법
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
핵심 요약
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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