Extrusion & Post
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Ovality of low density polyethylene pipes exceeding standard
Problem Phenomenon
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.
Cause Analysis
(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
Solution
(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
Key Takeaway
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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