Material Drying
4 조회수
Bubbles and silver streaks in PAR products due to insufficient drying
문제 현상
Bubbles and silver streaks appear inside or on the surface of PAR transparent products.
원인 분석
PAR has high heat resistance and strong moisture absorption; when the moisture is >0.02%, the moisture vaporizes during high-temperature processing, producing bubbles and silver streaks.
해결 방법
Dry at 120-140°C for 4-6h to moisture <0.02%; use a dehumidifying dryer with a dew point ≤-35°C.
핵심 요약
Strict PAR drying requirements are the prerequisite for high transparency.
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