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