Material Drying
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TPU Silver Streak Moisture Dominant
Fenómeno del problema
Radial silver streaks on the TPU product surface, with no obvious improvement after adjusting injection parameters
Análisis de la causa
The vast majority of TPU silver streaks are caused by moisture: water vapor expands sharply during mold filling and breaks through the surface layer; machine adjustment has no solution for such silver streaks, and the only way out is to strengthen drying; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①Check drying first: dew point and measured moisture content meet the standard; ②Check hopper moisture reabsorption; ③Consider other causes only after excluding moisture; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
When TPU shows silver streaks, suspect drying first; the three checks of dew point, moisture content and reabsorption are the fixed opening moves; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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