Processing Machinery
3 조회수
High acetaldehyde content in PET preforms
문제 현상
Acetaldehyde (AA) content in PET preforms exceeds the 3ppm standard, affecting bottled water taste and quality.
원인 분석
Processing temperature too high causes PET thermal degradation producing acetaldehyde, material residence time too long, screw shear too strong.
해결 방법
Reduce processing temperature to 265-280°C; shorten residence time; use low-shear screws; select low-AA grade raw material; add acetaldehyde scavengers.
핵심 요약
PET preform acetaldehyde content control is a key safety indicator for food packaging.
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