Material Drying
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PET Preform Acetaldehyde (AA) Odor
Problembeschreibung
After blowing, the bottle has an odor, affecting the taste of drinking water.
Ursachenanalyse
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.
Lösung
①Control material temperature and residence time; ②fully dry to reduce hydrolysis; ③select a low-AA generation process; ④conduct AA content testing for beverage bottles.
Wichtigste Erkenntnis
Odor = degradation products; dual control of temperature and water.
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