Material Drying
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PA66 dried material moisture regain time limit
Problembeschreibung
Qualified dried PA66 placed openly in the workshop for 1 hour then used, products show silver streaks
Ursachenanalyse
PA66 absorbs moisture extremely fast; 80℃ dried material exposed to humid air absorbs back over 0.1% moisture in 30 minutes, and basically fails after 1 hour; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Lösung
Use up material within 30 minutes after drying; drying hopper mounted directly on the machine with heat preservation; transfer in sealed containers, overtime material re-dried; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
PA66 dried material use time limit is counted in minutes, sealing and heat preservation are hard requirements; 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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