Extrusion & Post
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Rough EVA extrusion surface
Problembeschreibung
EVA extruded product surface roughness Ra>5μm, exceeding requirement
Ursachenanalyse
Extrusion temperature too low <140°C with unstable melt flow; die inner wall rough or damaged; EVA melt elasticity with uneven extrusion swell
Lösung
1) Increase 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 die are the core countermeasures
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