Extrusion & Post
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Ovality of general-purpose polyethylene pipes exceeding the standard
Problem Phenomenon
The pipe cross-section is not round, and the ovality exceeds the tolerance.
Ovality exceeding the standard affects the connection and installation of the pipe, 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 clamping force of the haul-off machine is too large, causing the pipe to deform
（4）The pipes are improperly stacked and deformed
（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 clamping force of the haul-off machine 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
Ovality exceeding the standard is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage.
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