Injection Molding
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Bonding Strength Between PBT Injection-Molded Parts and Metal Inserts
Problem Phenomenon
When PBT overmolds metal terminals or inserts, the interfacial bonding strength does not meet the standard.
Cause Analysis
PBT adheres poorly to metal surfaces, and the large molding shrinkage causes interfacial debonding; the metal inserts are not preheated.
Solution
Preheat the metal inserts to 100-150°C; knurl or groove the surface to increase mechanical anchoring; apply an adhesion promoter.
Key Takeaway
The bonding between PBT and metal inserts is a key quality of electrical connectors.
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