Material Drying
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PET bubble cause troubleshooting
Fenómeno del problema
PET sheet bubbles appear at random positions with varying sizes
Análisis de la causa
Random bubbles are mostly due to moisture fluctuations or entrained air; fixed-position bubbles point to local overheating degradation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Measure moisture content to rule out the moisture factor; check feed throat negative pressure air entrainment; for fixed positions, check local overheating of the barrel; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Bubbles are routed to troubleshooting directions according to position characteristics; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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