Material Drying
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PET sheet haze and poor transparency
Fenómeno del problema
The sheet is hazy and cloudy with reduced gloss; the appearance does not meet transparent packaging requirements
Análisis de la causa
Trace amounts of moisture affect PET optical properties; degraded material loses transparency; impurities from poor filtration scatter light; unstable cooling changes crystallization behavior and produces haze
Solución
① Strengthen drying performance; ② upgrade the melt filtration system; ③ optimize cooling and calendering processes to keep roll temperature stable; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PET transparency is the product of multiple factors; any loss of control of the four variables—moisture, degradation, impurities, and crystallization—will cause haze; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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