Material Drying
2 Aufrufe
PPSU insufficient drying surface streaks
Problembeschreibung
PPSU products show streaks or silver streaks on the surface, especially obvious on transparent baby bottles and medical parts; poor appearance but mechanical properties may be normal.
Ursachenanalyse
Although PPSU (Radel polyphenylsulfone) is hydrolysis stable and does not reduce molecular weight, incomplete drying causes surface streaks or severe blistering; moisture does not degrade the polymer but causes appearance defects; defective parts can be crushed, dried and reused.
Lösung
①Dry at 177℃×2.5 hours, 150℃×4 hours, or 135℃×4.5 hours; ②moisture content ≤500ppm for '2079851475616104452, ≤100ppm for extrusion; ③seal after drying to prevent moisture regain; ④defective parts can be reused after drying without loss of performance.
Wichtigste Erkenntnis
PPSU drying is the prerequisite for appearance quality; 500ppm/100ppm are different standards for '2079851475616104452/extrusion; reusability is a material economic advantage.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!