Extrusion & Post
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Excessive Ovality of High-Density Polyethylene Pipes
Problem Phenomenon
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.
Cause Analysis
（1）The cooling is uneven, and the shrinkage of the pipe in all directions is inconsistent
（2）The sizing sleeve is worn or installed incorrectly
（3）The haul-off machine clamping force is too large, causing pipe deformation
（4）The pipes are stacked improperly, producing deformation
（5）The cooling water temperature is too high, causing the pipe to soften and deform
Solution
（1）Check the cooling system to ensure uniform cooling of the pipe in all directions
（2）Check the sizing sleeve, replace it if worn, and ensure concentric installation
（3）Adjust the haul-off machine clamping force to avoid being too large
（4）Use special storage racks for pipes to avoid stacking deformation
（5）Control the cooling water temperature at 15-25°C
Key Takeaway
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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