Extrusion & Post
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POE extrusion pipe inner wall rough
Problem Phenomenon
POE extruded pipe inner wall roughness Ra>10μm, affecting fluid conveying efficiency
Cause Analysis
Mandrel surface rough or worn; insufficient internal cooling causes inner wall melt not fully sized; POE melt elasticity causes uneven die swell of the inner wall
Solution
1) Polish mandrel to Ra<0.4μm; 2) Optimize 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
Pipe inner wall roughness is caused by mandrel condition and insufficient cooling; polishing mandrel and internal cooling are key
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