Extrusion & Post
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Random copolymer polypropylene extruded pipe bending deformation
Problem Phenomenon
The pipe bends after extrusion, and the straightness is out of tolerance.
Bending deformation affects pipe installation and use, particularly prominent in long pipe production.
Cause Analysis
（1）Cooling on all sides along the extrusion direction is uneven, shrinkage inconsistent\
（2）The haul-off device is not concentric with the die\
（3）The cooling water tank is improperly installed or the water temperature is uneven\
（4）Uneven pipe wall thickness causes different shrinkage in all directions\
（5）Improper support after extrusion, the pipe's own weight causes bending
Solution
（1）Check the cooling system, ensure uniform cooling on all sides of the pipe\
（2）Adjust the haul-off device centerline to align with the die center\
（3）Correct the cooling water tank position, control uniform water temperature\
（4）Adjust the concentricity of the die and mandrel, ensure uniform wall thickness\
（5）Add pipe support rollers, reduce self-weight deformation
Key Takeaway
Pipe bending is caused by non-uniform cooling or haul-off eccentricity, and needs to be solved from cooling uniformity and equipment alignment.
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