Material Drying
3 조회수
PET dehumidifying drying dew point
문제 현상
After PET preforms are dried according to the process, white haze still appears, and the measured dew point of the drying air is only -25℃
원인 분석
PET moisture content requirements are demanding (below 50 ppm for bottle grade), and the dehydration limit of dry air at a dew point of -25℃ is insufficient to press the moisture content down to the required value
해결 방법
The dryer dew point must be stable below -40℃; the molecular sieve is regenerated and replaced regularly; a dew point meter monitors online with an alarm set; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
The first indicator of PET drying is the dew point, and -40℃ is the threshold for bottle-grade production; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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