Production & Quality
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Acetaldehyde increase in PET bottles during storage
Problem Phenomenon
The AA content of PET bottles increases over time during storage, exceeding shelf-life standards.
Cause Analysis
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.
Solution
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.
Key Takeaway
PET bottle AA content changes dynamically and needs full life-cycle control.
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