Processing Machinery
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PBT low weld line strength
Fenómeno del problema
Impact strength at the weld line is significantly lower than the body, breaking under stress.
Análisis de la causa
The fronts of the two melt flows have low temperature and poor fusion; PBT crystallizes fast making the front cool more easily, amplifying the weld line problem.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Increase melt and mold temperature; ②optimize gate position to avoid stressed areas; ③increase confluence speed; ④set an overflow well at the confluence.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PBT weld line management is the same as for other crystalline materials; design to avoid stressed areas takes priority.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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