Material Drying
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PVB Raw Material Insufficient Drying Bubbles
Problem Phenomenon
Bubbles appear inside or on the surface of PVB film after extrusion, bubbles expand after laminated glass lamination, optical defects are obvious.
Cause Analysis
PVB resin is extremely hygroscopic, and when moisture content exceeds standards, it vaporizes at 160~200℃ extrusion temperature to form bubbles; insufficient drying is the primary cause; secondary moisture absorption during storage and conveying.
Solution
①Precisely dry raw materials to control moisture content; ②Sealed conveying after drying to prevent secondary moisture absorption; ③Moisture detection and verification before extrusion; ④Environmental humidity management.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
The first gate of PVB bubble prevention is raw '2079851475616104451; moisture detection is a mandatory item; secondary moisture absorption management runs through the whole process.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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