Extrusion & Post
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Ovality of polyolefin plastomer pipes exceeding the standard
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）Uneven cooling causes inconsistent shrinkage in all directions of the pipe
（2）The sizing sleeve is worn or installed incorrectly
（3）The clamping force of the haul-off machine is too large, causing pipe deformation
（4）Improper stacking of pipes causes 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 in all directions of the pipe
（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 excessive force
（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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