Material Drying
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PA66 dried material storage time limit
Problem Phenomenon
Dried PA66 kept overnight in a stopped heat-preserving hopper, next-day products show slight silver streaks
Cause Analysis
After the heat-preserving hopper stops, dry air supply ceases, material slowly absorbs moisture from infiltrating air, moisture content rises back overnight; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Dried material storage limited within 4 hours; overnight requires keeping the dryer running; overtime material re-baked 1-2 hours; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Heat preservation does not equal dryness preservation, storage overtime must be re-baked; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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