Injection Molding
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Loosening of Nut Inserts During PBT '2079851475616104452
Problem Phenomenon
The overmolded nut inserts loosen or fall off after '2079851475616104452.
Cause Analysis
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.
Solution
Fully preheat the inserts to 100-150°C; design the inserts with anti-rotation knurling or slotting; optimize the cooling rate.
Key Takeaway
PBT overmolding of inserts requires full preheating and anti-rotation design.
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