Material Drying
6 مشاهدة
Bubbles and silver streaks in PAR products due to insufficient drying
ظاهرة المشكلة
Bubbles and silver streaks appear inside or on the surface of PAR transparent products.
تحليل الأسباب
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.
الحل
Dry at 120-140°C for 4-6h to moisture <0.02%; use a dehumidifying dryer with a dew point ≤-35°C.
الخلاصة الأساسية
Strict PAR drying requirements are the prerequisite for high transparency.
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