Injection Molding
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PETG and metal insert poor bonding
Problem Phenomenon
When PETG is injection molded over metal inserts, the bonding is not tight, and gaps or looseness appear around the insert.
Cause Analysis
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.
Solution
Preheat the insert to 80-120°C; roughen the insert surface or apply primer; reserve a shrinkage gap in the product design.
Key Takeaway
PETG overmolding of metal inserts requires insert preheating and surface treatment.
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