Material Drying
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PPSU insufficient drying produces bubbles
Fenómeno del problema
During PPSU processing, bubbles and silver streaks appear in products.
Análisis de la causa
PPSU has relatively strong hygroscopicity (water absorption 0.6%); with insufficient drying, moisture vaporizes and explodes at the ultra-high processing temperature of 340-390°C to form bubbles.
Solución
Dry at 135-150°C for 4-6h to moisture <0.03%, dew point ≤-35°C.
Conclusión clave
PPSU super drying is a basic processing requirement.
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