Material Drying
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PVB Laminated Center Scattered Bubbles
Problem Phenomenon
Scattered bubbles in the central area of laminated glass, related to preparation process and PVB storage.
Cause Analysis
Incomplete roller pressing venting; too fast roller pressing speed; PVB film moisture content exceeding standards; insufficient PVB thickness; improper storage conditions causing moisture absorption.; When troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
①Sufficient roller pressing venting; ②Control roller pressing speed; ③PVB moisture content up-to-standard management; ④Select thickness according to design; ⑤Storage condition control.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
PVB center bubbles and edge defects have different causes; moisture and thickness are material factors; storage management is prevention.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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