Material Drying
4 조회수
TPU bubbles (moisture type)
문제 현상
Bubbles and cavities appear inside or on the surface layer of TPU products, the surface bulges, and they decrease significantly after drying treatment.
원인 분석
TPU is highly sensitive to moisture; after the pellets absorb moisture, the moisture vaporizes at high temperature forming bubbles; insufficient drying temperature and time or secondary moisture absorption after drying both cause the moisture content to exceed the standard.
해결 방법
①dry at 80~100℃ for 4~6 hours to ensure moisture content ≤0.05%; ②use immediately after drying to avoid secondary moisture absorption; ③closed conveying to prevent re-absorption of moisture; ④check the dew point and air volume of the dryer.
핵심 요약
Eighty percent of TPU bubbles originate from moisture management; meeting the drying standard is only the first step, and controlling the exposure time after drying is equally critical; repeated heating cannot replace drying.
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