Injection Molding
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Loosening of Nut Inserts During PBT '2079851475616104452
Fenómeno do problema
The overmolded nut inserts loosen or fall off after '2079851475616104452.
Análise das causas
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.
Solução
Fully preheat the inserts to 100-150°C; design the inserts with anti-rotation knurling or slotting; optimize the cooling rate.
Conclusão principal
PBT overmolding of inserts requires full preheating and anti-rotation design.
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