Molds & Tooling
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ABS brittle cracking——too low mold temperature, weak weld line
Fenómeno do problema
The product cracks at the weld line position; the fracture always occurs along the confluence line.
Análise das causas
When the mold temperature is too low, the melt front cools quickly after entering the cavity, the molecular chains at the confluence of the two melt flows cannot be fully entangled, and the weld line strength is seriously insufficient.
Solução
①Adjust the mold temperature to a reasonable range (generally 40~80℃); ②appropriately increase the mold temperature for thick-wall parts; ③increase the melt temperature and injection speed to keep the confluence at temperature; ④adjust the gate position to avoid the load-bearing area.
Conclusão principal
Weld line strength is guaranteed by temperature; low temperature and fast cooling is an invisible killer.
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