Extrusion & Post
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CEF extrusion surface rough
Problem Phenomenon
The surface roughness of the CEF extruded product is Ra>5μm, exceeding the requirement
Cause Analysis
The extrusion temperature is low <160°C and the melt flow is unstable; the inner wall of the die is rough or damaged; the CEF melt elasticity causes uneven extrusion swell
Solution
1) Increase the extrusion temperature to 160-220°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
Key Takeaway
Surface roughness is caused by low-temperature extrusion and die defects; increasing the temperature and polishing the die are the core countermeasures
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