Material Drying
5 views
PET Preform Acetaldehyde (AA) Odor
Problem Phenomenon
After blowing, the bottle has an odor, affecting the taste of drinking water.
Cause Analysis
Acetaldehyde is produced by thermal degradation and hydrolysis during PET melt processing; excessive material temperature, too long residence, and high water content all increase AA generation.
Solution
①Control material temperature and residence time; ②fully dry to reduce hydrolysis; ③select a low-AA generation process; ④conduct AA content testing for beverage bottles.
Key Takeaway
Odor = degradation products; dual control of temperature and water.
Was this helpful?
0 people found this helpful
Thank you for your feedback!