Production & Quality
10 Aufrufe
PVA performance decay after repeated processing
Problembeschreibung
After 3-4 times of recycling and reprocessing, PVA tensile strength decreases by 25-30%
Ursachenanalyse
Molecular chains break and degrade under repeated high-temperature shear; antioxidant exhausted in multiple processing; cumulative effect of thermo-mechanical degradation
Lösung
1) Recycled material ratio not exceeding 20-30%; 2) Supplement 0.1-0.2wt% antioxidant at each re-extrusion; 3) Lower processing temperature by 5-10°C; 4) Reduce screw speed to reduce shear
Wichtigste Erkenntnis
Performance decay after multiple processing is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant are the key
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!