Extrusion & Post
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Heat-resistant polyethylene pipe ovality exceeding 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) Cooling uneven, pipe shrinkage inconsistent in all directions
(2) Sizing sleeve worn or improperly installed
(3) Haul-off clamping force too large 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 to ensure uniform cooling of the pipe in all directions
(2) Check the sizing sleeve, replace if worn, ensure concentric installation
(3) Adjust haul-off clamping force to avoid excessive force
(4) Use special storage racks for pipes to 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, and needs to be solved from cooling uniformity and pipe storage.
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