Material Drying
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PVB Laminated Center Scattered Bubbles
Fenómeno del problema
Scattered bubbles in the central area of laminated glass, related to preparation process and PVB storage.
Análisis de la causa
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
Solución
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
Conclusión clave
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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