Material Drying
3 Aufrufe
Color Darkening of PBT Injection-Molded Parts (Yellowing/Browning)
Problembeschreibung
The color of PBT products changes from white or natural color to yellow or brown.
Ursachenanalyse
The processing temperature is too high or the residence time is too long, causing thermal oxidative degradation; insufficient drying of the raw material causes hydrolytic degradation; the regrind ratio is too high.
Lösung
Strictly control the processing temperature ≤260°C; shorten the residence time; dry fully; control the regrind ratio.
Wichtigste Erkenntnis
PBT color change is an early warning signal of degradation.
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!