Extrusion & Post
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Rough Surface in PU Extrusion
Problem Phenomenon
PU extruded product surface roughness Ra>5μm, exceeding the requirement
Cause Analysis
Extrusion temperature too low <60°C, melt flow unstable; die inner wall rough or damaged; PU melt elasticity, extrusion swell uneven
Solution
1) Increase extrusion temperature to 60-120°C; 2) Polish die inner wall Ra<0.4μm; 3) Reduce 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 temperature and polishing the die are the core countermeasures
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