Material Drying
2 views
Bubbles and silver streaks in PAR products due to insufficient drying
Problem Phenomenon
Bubbles and silver streaks appear inside or on the surface of PAR transparent products.
Cause Analysis
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.
Solution
Dry at 120-140°C for 4-6h to moisture <0.02%; use a dehumidifying dryer with a dew point ≤-35°C.
Key Takeaway
Strict PAR drying requirements are the prerequisite for high transparency.
Was this helpful?
0 people found this helpful
Thank you for your feedback!