Extrusion & Post
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Ovality of low density polyethylene pipes exceeding standard
Fenómeno del problema
Pipe cross-section is not round, ovality exceeds tolerance.
Excessive ovality affects pipe connection and installation, and may cause leakage in socket connections and mechanical connections.
Análisis de la causa
(1) Uneven cooling, inconsistent pipe shrinkage in each direction
(2) Sizing sleeve worn or improperly installed
(3) Excessive haul-off clamping force causes pipe deformation
(4) Improper pipe stacking causes deformation
(5) Cooling water temperature too high causes pipe softening and deformation
Solución
(1) Check the cooling system, ensure uniform pipe cooling in all directions
(2) Check the sizing sleeve, replace if worn, ensure concentric installation
(3) Adjust haul-off clamping force, avoid excessiveness
(4) Use dedicated storage racks for pipes, avoid stacking deformation
(5) Control cooling water temperature at 15-25°C
Conclusión clave
Excessive ovality is caused by uneven cooling or external force deformation; it needs to be solved from cooling uniformity and pipe storage.
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