Material Drying
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Silver streaks caused by moisture during EAA processing
Fenómeno del problema
White silver streaks appear on the surface of EAA injection molded products
Análisis de la causa
Raw material contains moisture >0.05%, which vaporizes during high-temperature processing to form bubbles that are stretched into silver streaks; insufficient drying or condensed moisture in the hopper
Solución
1) Dry the raw material at 80°C for 3-4h to moisture content <0.02%; 2) Increase the back pressure by 0.5-1MPa for venting; 3) Reduce the injection speed to avoid air entrainment; 4) Heat the hopper to prevent condensed moisture
Conclusión clave
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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