Material Drying
3 Aufrufe
PBT product bubbles (degradation)
Problembeschreibung
Bubbles still exist after full drying, reduced after lowering temperature.
Ursachenanalyse
Excessive melt temperature or too long residence causes PBT thermal degradation gas generation; shear overheating also produces it.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
①Lower melt temperature; ②shorten residence time; ③reduce screw speed; ④clean the barrel.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Distinguish moisture and degradation for bubbles; if drying is ineffective, check the temperature history.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!