Extrusion & Post
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Rough inner wall of PVA extruded pipe
Problem Phenomenon
Inner wall roughness of PVA extruded pipe Ra>10μm, affecting fluid conveying efficiency
Cause Analysis
Mandrel surface rough or worn; insufficient internal cooling causing inner wall melt not fully sized; PVA melt elasticity causing uneven extrusion swell of the inner wall
Solution
1) Polish mandrel to Ra<0.4μm; 2) Optimize internal cooling system, 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 mandrel and internal cooling are key
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