Injection Molding
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Loosening of Nut Inserts During PBT '2079851475616104452
Fenómeno del problema
The overmolded nut inserts loosen or fall off after '2079851475616104452.
Análisis de la causa
The inserts are insufficiently preheated, and PBT shrinks too much during cooling, so the wrapping is not tight; the insert surface has no anti-rotation structure.
Solución
Fully preheat the inserts to 100-150°C; design the inserts with anti-rotation knurling or slotting; optimize the cooling rate.
Conclusión clave
PBT overmolding of inserts requires full preheating and anti-rotation design.
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