Production & Quality
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PET preforms turn yellow during storage
Problem Phenomenon
PET preforms turn yellow after 3-6 months of warehouse storage and cannot be used for transparent bottles.
Cause Analysis
The thermal history and residual stress from preform processing are slowly released during storage; oxidative degradation continues to occur; storage temperature is on the high side.
Solution
Reduce preform processing temperature; store at ≤25°C away from light; manage on a first-in, first-out basis; seal preform packaging to prevent oxidation.
Key Takeaway
PET preform quality management during storage is an important link in the supply chain.
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