Material Drying
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PA6 Post-Drying Storage Time Limit
Problem Phenomenon
Dried PA6 is stored overnight with heat preservation in the drying hopper, and production the next day shows slight silver streaks
Cause Analysis
When the drying hopper is shut down for heat preservation, the dry air supply is interrupted or the temperature drops, the material re-absorbs moisture from the environment, and after one night the moisture content rises back above the critical value; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
The storage time limit of dried material is controlled within 4 hours; overnight storage requires keeping the dryer running to maintain dry air circulation; material exceeding the time limit is re-dried for 1-2 hours before use
Key Takeaway
Dried material has a storage time limit, and overtime material must be re-dried; heat preservation does not equal continuous drying; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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