Material Drying
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Hopper Temperature Out of Control and Moisture Regain of PEEK
Problem Phenomenon
[Problem Phenomenon] Properly dried PEEK absorbs moisture again after staying in the hopper, and silver streaks on products recur
Cause Analysis
Dried pellets exposed to workshop air in a high-temperature hopper re-absorb moisture; the Victrex 150G data sheet requires the hopper temperature to be below 100℃ and the exposure time to be shortened
Solution
Control the hopper temperature below 100℃ and equip an insulated drying hopper; feed material in batches according to usage to reduce residence; increase the frequency of moisture content sampling inspection in humid seasons; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Passing drying is only the starting point, and hopper moisture-regain management determines the final moisture state; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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