Extrusion & Post
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Random copolymer polypropylene pipe ovality exceeding standard
Problembeschreibung
The pipe cross-section is not round, and the ovality exceeds the tolerance.
Excessive ovality affects pipe connection and installation, and may cause leakage in socket connections and mechanical connections.
Ursachenanalyse
（1）Cooling is uneven, and the pipe shrinks inconsistently in all directions\
（2）The sizing sleeve is worn or improperly installed\
（3）The haul-off machine clamping force is too large, causing pipe deformation\
（4）Improper pipe stacking causes deformation\
（5）Cooling water temperature too high causes the pipe to soften and deform
Lösung
（1）Check the cooling system, ensure uniform cooling in all directions of the pipe\
（2）Check the sizing sleeve, replace if worn, ensure concentric installation\
（3）Adjust the haul-off machine clamping force, avoid excessive force\
（4）Use dedicated storage racks for pipes, avoid stacking deformation\
（5）Control the cooling water temperature at 15-25°C
Wichtigste Erkenntnis
Excessive ovality is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage.
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