Material Drying
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TPE first article verification
Fenómeno del problema
After material and mold changes, bubbles and poor bonding appear in batches; the first article is only checked for appearance
Análisis de la causa
TPE is sensitive to moisture content and temperature, and the drying state changes after material change; overmolded parts also need bonding strength verification; if the first article is not fully verified, batch risk is out of control
Solución
①the first article performs three verifications of appearance, dimensions, and moisture content; ②overmolded parts add bonding strength testing; ③mass production after parameters are locked; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
TPE first article verification must include material state and bonding; qualified appearance does not mean qualified function; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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