Material Drying
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PSU Drying Temperature and Time Three-level Selection
Problem Phenomenon
[Problem Phenomenon] After PSU drying, products still have surface silver streaks and water marks; drying parameter execution is inconsistent
Cause Analysis
Syensqo officially provides three drying levels for Udel PSU: 163°C×2h, 149°C×3h, 135°C×4h, with target moisture content <0.05% for '2079851475616104452 and <0.01% for extrusion; when the level does not match equipment capability, drying is incomplete
Solution
Select the level according to equipment capability: choose 135°C×4h or above for dehumidifying dryers, and high-temperature short-time levels for hot air ovens; extrusion grade is strictly accepted at 0.01%; inlet air dew point -40°C and pellet temperature maintained above 135°C
Key Takeaway
Any of the three PSU drying levels may be chosen but the target is unified; extrusion 0.01% is stricter than '2079851475616104452 0.05%; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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