Material Drying
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Silver streaks caused by moisture during EAA processing
Problembeschreibung
White silver streaks appear on the surface of EAA injection molded products
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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