Extrusion & Post
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Rough EEA extrusion surface
Problem Phenomenon
EEA extruded product surface roughness Ra>5μm exceeding requirements
Cause Analysis
Extrusion temperature too low <160°C, unstable melt flow; die inner wall rough or damaged; EEA melt elasticity, uneven extrusion swell
Solution
1) Increase extrusion temperature to 160-210°C; 2) Polish the die inner wall to Ra<0.4μm; 3) Reduce extrusion rate by 10-15%; 4) Add 0.3-0.5wt% external lubricant
Key Takeaway
Rough surface is caused by low-temperature extrusion and die defects; increasing temperature and polishing the die are the core countermeasures
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