Material Drying
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PSU Can Be Stored Long-term at 135°C Without Over-drying
Problem Phenomenon
[Problem Phenomenon] Worrying about over-drying degradation of PSU and ending drying early, resulting in insufficient drying instead
Cause Analysis
Sulfone polymers will not over-dry: they can be stored at 135°C for up to a week without damage; ending drying early or lowering temperature is the real risk; below 135°C, drying time becomes impractically long
Solution
Drying is better long than short; material can be held long-term at 135°C; keep drying temperature in the hopper during production gaps; do not shorten drying out of fear of over-drying; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
There is no such thing as over-drying for PSU; a week at 135°C is safe; only insufficient drying is to be feared; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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