Extrusion & Post
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PVB Improper Extrusion Temperature Degradation
Fenómeno del problema
PVB film shows yellowing, degradation spots, and performance decline, extrusion temperature out of control exceeding 200℃ or long-term high-temperature residence.
Análisis de la causa
PVB processing temperature is 160~200℃, too high temperature causes thermal degradation; long-term high-temperature residence accumulates heat history; local overheating area degradation; uneven temperature distribution.
Solución
①Control extrusion temperature within 160~200℃; ②Avoid long-term high-temperature residence; ③Temperature distribution uniformity management; ④Purge the machine after degradation.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Conclusión clave
PVB's 160~200℃ temperature window prevents degradation; residence time management is equally important; uniformity guarantees consistent quality.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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