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