Extrusion & Post
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EMA Extrusion Rough Surface
Problem Phenomenon
EMA extruded product surface roughness Ra>5μm, exceeding requirements
Cause Analysis
Extrusion temperature low <160°C, melt flow unstable; die inner wall rough or damaged; EMA melt elasticity, extrusion swell uneven
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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