Injection Molding
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TPE Overmolding Weak Bonding
Problem Phenomenon
TPE overmolded parts peel from the hard plastic substrate, bonding strength is insufficient, and cracking occurs in use
Cause Analysis
TPE overmolding bonding relies on chemical compatibility and mechanical interlocking; incompatible materials, insufficient temperature, surface contamination, and poor structural design all cause bonding failure; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Select overmolding-grade TPE paired with hard plastic; ②Clean and preheat the hard plastic surface; ③Design mechanical interlocks such as grooves and undercuts; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE overmolding bonding is a dual design of chemistry plus mechanics; material pairing and structural interlocking are both indispensable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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