Extrusion & Post
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Bending deformation of polyolefin plastomer extruded pipes
Problem Phenomenon
The pipe bends after extrusion, and the straightness is out of tolerance.
Bending deformation affects the installation and use of pipes and is particularly prominent in the production of long pipes.
Cause Analysis
（1）The cooling on each side in the extrusion direction is uneven and the shrinkage is inconsistent
（2）The hauling device is not concentric with the die
（3）The cooling water tank is installed incorrectly or the water temperature is uneven
（4）The uneven pipe wall thickness causes different shrinkage in all directions
（5）Improper support after extrusion causes the pipe to bend due to its own weight
Solution
（1）Check the cooling system to ensure uniform cooling on all sides of the pipe
（2）Align the center line of the hauling device with the center of the die
（3）Correct the position of the cooling water tank and control the water temperature to be uniform
（4）Adjust the concentricity of the die and mandrel to ensure uniform wall thickness
（5）Add pipe support rollers to reduce self-weight deformation
Key Takeaway
Pipe bending is caused by non-uniform cooling or hauling eccentricity, and needs to be solved from cooling uniformity and equipment alignment.
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