Extrusion & Post
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Rough surface in EAA extrusion
Problembeschreibung
The surface roughness of EAA extruded products is Ra>5μm, exceeding the requirement
Ursachenanalyse
Extrusion temperature too low <180°C, melt flow unstable; inner wall of the die rough or damaged; EAA melt elasticity, uneven extrusion swell
Lösung
1) Raise the extrusion temperature to 180-240°C; 2) Polish the inner wall of the die to Ra<0.4μm; 3) Reduce the extrusion rate by 10-15%; 4) Add 0.3-0.5wt% external lubricant
Wichtigste Erkenntnis
Surface roughness is caused by low-temperature extrusion and die defects; raising the temperature and polishing the die are the core countermeasures
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