Material Drying
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PA66 insufficient drying time
Problem Phenomenon
Startup after only 2 hours of drying, products normal initially but intermittent silver streaks appear later
Cause Analysis
Moisture diffusion from the core of PA66 particles is slow; short-time drying only removes surface moisture, material in the later sections of the hopper still exceeds moisture standard; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Drying time guaranteed over 4 hours, 6 hours for large loading; endpoint judged by moisture content sampling rather than fixed time; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Drying time must allow core moisture to fully diffuse out, sampling confirmation is the bottom line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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