Extrusion & Post
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Rough inner wall of EVA extruded pipe
Problem Phenomenon
EVA extruded pipe inner wall roughness Ra>10μm affects fluid conveying efficiency
Cause Analysis
Mandrel surface rough or worn; insufficient internal cooling causing inner wall melt not fully sized; EVA melt elasticity causing uneven extrusion swell on inner wall
Solution
1) Polish mandrel to Ra<0.4μm; 2) Optimize internal cooling system with cooling water through mandrel; 3) Reduce extrusion rate to reduce elastic recovery influence; 4) Add small amount of low-elasticity resin to improve inner wall smoothness
Key Takeaway
Pipe inner wall roughness is caused by mandrel condition and insufficient cooling; polishing mandrel and internal cooling are key
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