Material Drying
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Bubbles and silver streaks in PAR products due to insufficient drying
Fenómeno del problema
Bubbles and silver streaks appear inside or on the surface of PAR transparent products.
Análisis de la causa
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.
Solución
Dry at 120-140°C for 4-6h to moisture <0.02%; use a dehumidifying dryer with a dew point ≤-35°C.
Conclusión clave
Strict PAR drying requirements are the prerequisite for high transparency.
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