Extrusion & Post
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TPE Overmolding Long-Term Delamination
Problem Phenomenon
Room temperature test passes, but delamination occurs after the customer uses it for a period of time.
Cause Analysis
Insufficient verification lacking environmental reliability testing; temperature cycling, chemical contact, long-term stress or ultraviolet slowly weaken interface strength.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Review the product use environment; ②supplement aging test, chemical resistance test or creep test; ③evaluate the long-term durability of adhesion; ④improve the verification plan.
Key Takeaway
Overmolding adhesion verification must cover the actual use environment; room temperature immediate testing is insufficient to guarantee long-term reliability.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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