Injection Molding
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Poor Interfacial Bonding in LCP Insert Molding
Problem Phenomenon
【Problem Phenomenon】After '2079851475616104452 LCP onto metal inserts, the interfacial bonding force is insufficient, and they detach in torsion-tension tests
Cause Analysis
LCP has extremely small shrinkage and is chemically inert, so its gripping force on metal and interfacial bonding are weak; when insert preheating is insufficient, the melt at the contact surface quenches and bonding is even worse; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
Preheat inserts to near mold temperature before molding; knurl the metal surface or design structural locks to provide mechanical anchoring; include interfacial bonding force verification in first article inspection; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LCP's low shrinkage gives weak gripping on inserts; preheating plus mechanical anchoring is double insurance; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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