Material Drying
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PA6 Monofilament Fiber
Problem Phenomenon
Monofilament has a high breakage rate during drawing, uneven filament diameter, and strength not reaching the specification
Cause Analysis
PA6 spinning is extremely sensitive to moisture content, and trace moisture vaporizes at the spinneret holes and breaks the filament; melt temperature fluctuations directly cause filament diameter deviation and strength dispersion; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Deep drying before spinning to moisture content ≤0.08%; ②control melt temperature fluctuation within ±1°C; ③regularly clean the spinneret to prevent blockage by degradation products; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Spinning-grade PA6 pushes drying and temperature control requirements to the limit; 0.08% moisture content and ±1°C temperature control are hard indicators for stable spinning; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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