Material Drying
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PPSU insufficient drying produces bubbles
Fenómeno do problema
During PPSU processing, bubbles and silver streaks appear in products.
Análise das causas
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.
Solução
Dry at 135-150°C for 4-6h to moisture <0.03%, dew point ≤-35°C.
Conclusão principal
PPSU super drying is a basic processing requirement.
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