Extrusion & Post
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PVB Edge-Center Composite Bubbles
Problem Phenomenon
Bubbles appear simultaneously at the edge and center of laminated glass, more common in non-matched tempered laminated glass.
Cause Analysis
Poor glass flatness matching; thin PVB film; slow roller pressing sealing too early; poor roller pressing performance; excessive edge mechanical pressure; residual stress exceeding limits.; When troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
①Glass flatness matching inspection; ②Sufficient PVB thickness; ③Roller pressing process optimization; ④Mechanical pressure control; ⑤Stress management.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
Glass matching is the primary factor for PVB composite bubbles; roller pressing process finely adjusted; stress management runs throughout.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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