Injection Molding
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PETG and metal insert poor bonding
Fenómeno del problema
When PETG is injection molded over metal inserts, the bonding is not tight, and gaps or looseness appear around the insert.
Análisis de la causa
The metal insert temperature is low and it cools and shrinks rapidly upon contacting PETG, the insert surface is untreated and bonding is poor, thermal expansion coefficients differ greatly.
Solución
Preheat the insert to 80-120°C; roughen the insert surface or apply primer; reserve a shrinkage gap in the product design.
Conclusión clave
PETG overmolding of metal inserts requires insert preheating and surface treatment.
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