Extrusion & Post
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PA6 Fishing Line Monofilament
Problem Phenomenon
PA6 monofilament fishing line has low knot strength and breaks easily at the knot
Cause Analysis
Monofilament has high strength after drawing orientation but stress concentrates at the knot; PA6 strength decreases after water absorption, and the knot strength is only 60-70% of the straight strength; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Optimize the draw ratio and heat setting in monofilament production to improve knot strength; avoid sharp-angle knots on the user end; select dedicated copolymer-modified monofilament for high-strength requirements; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Monofilament performance is regulated by the drawing process, and knot strength is the core indicator of fishing line; 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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