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