Material Drying
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PA6 Extruded Pipe
Fenómeno do problema
PA6 pipe has a rough inner wall and eccentric wall thickness, and bursts in the pressure test
Análise das causas
Uneven melt temperature and die gap deviation cause wall thickness eccentricity; inner wall micro-bubbles from insufficient drying become pressure-resistant weak points; haul-off speed fluctuations thin the pipe wall; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Precisely adjust the coaxiality of the die and core; ②moisture content ≤0.15% to prevent inner wall bubbles; ③closed-loop matching of haul-off and extrusion speeds; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
The pressure reliability of PA6 pipe is built on uniform wall thickness and no micro-bubbles; coaxiality and drying are the two preconditions; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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