Molds & Tooling
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PA6 Weak Weld Lines
Fenómeno del problema
Low strength at weld lines, cracking under stress, becoming a structurally weak zone.
Análisis de la causa
Insufficient front confluence temperature + poor venting; PA6 crystallizes quickly, the confluence interface freezes quickly and bonds weakly; molecular chains are shaped before they have time to entangle; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solución
①Increase material temperature and mold temperature to maintain front temperature;②open vent grooves at the melt confluence;③increase injection speed to maintain melt front temperature and improve filling;④keep weld lines away from stressed areas;⑤set an overflow well at the confluence to lead the cold front out of the cavity.
Conclusión clave
PA6 weld lines = 'entangle before crystallization': raising temperature, increasing speed, and venting in three ways; for fast-crystallizing nylon, confluence temperature is decisive, and position planning must also be advanced.
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