Material Drying
5 مشاهدة
Hydrolysis Bubbles and Silver Streaks in PC Products
ظاهرة المشكلة
Bubbles and silver streaks appear on the surface and inside of PC transparent products.
تحليل الأسباب
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.
الحل
Strict drying: 120°C/4-6h, dew point ≤-35°C, moisture <0.02%; use a dehumidifying dryer, and convey sealed after drying.
الخلاصة الأساسية
PC drying is the first decisive factor for processing success or failure.
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