Extrusion & Post
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Rough surface of PVA extrusion
Problembeschreibung
PVA extruded product surface roughness Ra>5μm exceeds the requirement
Ursachenanalyse
Extrusion temperature on the low side <140°C, melt flow unstable; die inner wall rough or damaged; PVA melt elasticity causes uneven extrusion swelling
Lösung
1) Raise extrusion temperature to 140-200°C; 2) Polish die inner wall to Ra<0.4μm; 3) Reduce extrusion rate by 10-15%; 4) Add 0.3-0.5wt% external lubricant
Wichtigste Erkenntnis
Rough surface is caused by low-temperature extrusion and die defects; raising temperature and polishing the die are the core countermeasures
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