Production & Quality
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Acetaldehyde increase in PET bottles during storage
Fenómeno del problema
The AA content of PET bottles increases over time during storage, exceeding shelf-life standards.
Análisis de la causa
Residual thermal history in the preform slowly releases acetaldehyde; insufficient crystallinity causes oxygen permeation that promotes AA generation; storage temperature is on the high side.
Solución
Reduce preform processing temperature to reduce initial AA; increase crystallinity to reduce oxygen permeation; store at low temperature <30°C; use oxygen-barrier bottle design.
Conclusión clave
PET bottle AA content changes dynamically and needs full life-cycle control.
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