Material Drying
3 Aufrufe
EMA Processing Moisture Causes Silver Streaks
Problembeschreibung
White silver streaks appear on the surface of EMA 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 water vapor in the hopper
Lösung
1) Dry the raw material at 80°C for 3-4h to moisture <0.02%; 2) Increase back pressure 0.5-1MPa for venting; 3) Reduce injection speed to avoid air entrapment; 4) Heat the hopper to prevent condensed water vapor
Wichtigste Erkenntnis
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!