Material Drying
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Hydrolysis Bubbles and Silver Streaks in PC Products
Fenómeno do problema
Bubbles and silver streaks appear on the surface and inside of PC transparent products.
Análise das causas
PC is extremely sensitive to moisture; hydrolysis occurs when moisture >0.02%; at a processing temperature of 270-320°C, water molecules attack the carbonate bonds to produce CO₂, forming bubbles and silver streaks.
Solução
Strict drying: 120°C/4-6h, dew point ≤-35°C, moisture <0.02%; use a dehumidifying dryer, and convey sealed after drying.
Conclusão principal
PC drying is the first decisive factor for processing success or failure.
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