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