Material Drying
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TPE Overmolding Bubbles
Fenómeno del problema
TPE overmolded parts blister on the surface, bubbles are visible at the bonding interface, and strength decreases
Análisis de la causa
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
Solución
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
Conclusión clave
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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