Material Drying
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PESU Drying Temperature One Level Higher
Problem Phenomenon
[Problem Phenomenon] Applying PSU drying parameters to PESU, products still show silver streaks and bubbles
Cause Analysis
PESU absorbs moisture more strongly (saturated water absorption about 2.1%); official drying is 177°C×3h, 150°C×4h, 135°C×5h, overall one level higher than PSU; applying PSU parameters results in insufficient drying
Solution
Execute PESU at 177°C×3h/150°C×4h/135°C×5h; dry on separate lines from PSU to prevent parameter mixing; likewise accept at 0.05% for '2079851475616104452 / 0.01% for extrusion
Key Takeaway
PESU drying is one level higher than PSU; 177°C×3h is the benchmark; parameters cannot be applied interchangeably; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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