Extrusion & Post
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Rough Inner Wall of PU Extruded Pipe
Problem Phenomenon
PU extruded pipe inner wall roughness Ra>10μm, affecting fluid transport efficiency
Cause Analysis
Mandrel surface rough or worn; internal cooling insufficient, inner wall melt not fully sized; PU melt elasticity causing uneven inner wall extrusion swell
Solution
1) Polish mandrel to Ra<0.4μm; 2) Optimize the internal cooling system, cooling water through the mandrel; 3) Reduce extrusion rate to decrease elastic recovery effect; 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 the mandrel and internal cooling are key
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