Material Drying
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PSU Hopper Drying System Requirements
Problem Phenomenon
[Problem Phenomenon] Hopper-dried PSU repeatedly exceeds moisture content limits; drying effect is unstable
Cause Analysis
Hopper drying requires full insulation and minimal system leakage: inlet air temperature must be high enough to maintain pellet temperature at least 135°C, inlet air dew point -40°C; poor insulation or air leakage collapses drying efficiency
Solution
Insulate the hopper and piping and check sealing; monitor inlet air temperature and dew point for compliance; measured pellet temperature above 135°C counts as effective drying; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hopper drying depends on pellet temperature 135°C and dew point -40°C; insulation and air leakage are hidden wounds; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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