Extrusion & Post
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Ovality of linear low-density polyethylene pipes exceeding standard
Problem Phenomenon
The pipe cross-section is not round, and ovality exceeds the tolerance.
Ovality exceeding the standard 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) Excessive haul-off machine clamping force causes pipe deformation
(4) Improper pipe stacking causes deformation
(5) Excessive cooling water temperature causes pipe softening and deformation
Solution
(1) Check the cooling system to ensure uniform cooling in all directions of the pipe
(2) Check the sizing sleeve; replace 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 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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