Injection Molding
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Poor Bonding Force in LCP Two-Color and Overmolding
Problem Phenomenon
【Problem Phenomenon】Interface peeling occurs after overmolding LCP with soft rubber
Cause Analysis
LCP has low surface energy and is chemically inert; it has no chemical bonding with most soft rubbers and relies only on mechanical interlocking; the overmolding interface is inherently weak; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
Design mechanical interlocking structures at the interface; select special soft rubber grades that can bond to LCP and do bonding verification; surface plasma treatment to improve bonding force; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LCP overmolding relies on mechanical interlocking and special soft rubber; chemical bonding cannot be depended on; 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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