Material Drying
7 조회수
PET Preform Acetaldehyde (AA) Odor
문제 현상
After blowing, the bottle has an odor, affecting the taste of drinking water.
원인 분석
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.
해결 방법
①Control material temperature and residence time; ②fully dry to reduce hydrolysis; ③select a low-AA generation process; ④conduct AA content testing for beverage bottles.
핵심 요약
Odor = degradation products; dual control of temperature and water.
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