Material Drying
8 visualizaciones
Color Darkening of PBT Injection-Molded Parts (Yellowing/Browning)
Fenómeno del problema
The color of PBT products changes from white or natural color to yellow or brown.
Análisis de la causa
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.
Solución
Strictly control the processing temperature ≤260°C; shorten the residence time; dry fully; control the regrind ratio.
Conclusión clave
PBT color change is an early warning signal of degradation.
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!