Material Drying
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PA6 Post-Drying Conveying Moisture Protection
Problem Phenomenon
Qualified dried PA6 shows moisture exceeding the standard again after being conveyed to the machine via open conveying
Cause Analysis
Dried PA6 above 80°C is in a strongly hygroscopic state, and exposure to humid air for a few minutes can re-absorb a large amount of moisture; open screw conveying or manual transfer causes the dried material to re-absorb moisture
Solution
Dried material is conveyed to the machine via enclosed pipelines with hot-air insulation, or the drying hopper is installed directly above the '2079851475616104452 machine for drying and immediate use; the transfer process is controlled within 10 minutes and uses enclosed containers
Key Takeaway
Post-drying moisture protection is as important as drying itself, and enclosed conveying is the key to preventing moisture re-absorption; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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