Processing Machinery
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High acetaldehyde content in PET preforms
Problem Phenomenon
Acetaldehyde (AA) content in PET preforms exceeds the 3ppm standard, affecting bottled water taste and quality.
Cause Analysis
Processing temperature too high causes PET thermal degradation producing acetaldehyde, material residence time too long, screw shear too strong.
Solution
Reduce processing temperature to 265-280°C; shorten residence time; use low-shear screws; select low-AA grade raw material; add acetaldehyde scavengers.
Key Takeaway
PET preform acetaldehyde content control is a key safety indicator for food packaging.
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