Material Drying
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TPE Overmolding Bubbles
Problem Phenomenon
TPE overmolded parts blister on the surface, bubbles are visible at the bonding interface, and strength decreases
Cause Analysis
Main causes of overmolding bubbles: undried moisture in TPE or hard plastic, air entrapment from excessive injection speed, volatilization of hard plastic surface contamination, temperature mismatch; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Fully dry TPE and hard plastic; ②Reduce injection speed; ③Clean and preheat the hard plastic surface; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE overmolding bubbles require dual-material control; drying, speed, and cleanliness proceed in parallel; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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