Material Drying
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Degradation of PBT due to excessive pre-drying
Problembeschreibung
PBT particles turn yellow and IV decreases when the drying temperature is too high or the time is too long.
Ursachenanalyse
When the drying temperature exceeds 130°C or the time exceeds 8h, PBT undergoes thermal oxidative degradation, especially when containing oxidative catalysts.
Lösung
Strict drying temperature of 120°C/4-6h; use timing and temperature control protection; first in first out for materials in the drying hopper.
Wichtigste Erkenntnis
Over-drying of PBT is equally harmful.
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