Extrusion & Post
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Rough inner wall of EAA extruded pipe
Problem Phenomenon
The inner wall roughness of EAA extruded pipe is Ra>10μm, affecting fluid transport efficiency
Cause Analysis
Rough or worn mandrel surface; insufficient internal cooling causes the inner wall melt to be insufficiently sized; EAA melt elasticity causes 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 the extrusion rate to reduce the influence of elastic recovery; 4) Add a small amount of low-elasticity resin to improve inner wall smoothness
Key Takeaway
The rough inner wall of the pipe is caused by the mandrel condition and insufficient cooling; polishing the mandrel and internal cooling are the key
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