Material Drying
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PET dehumidifying drying dew point
Problembeschreibung
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℃
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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