Extrusion & Post
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Bending Deformation of Polypropylene Extruded Pipe
Fenómeno del problema
The pipe bends after extrusion, and the straightness is out of tolerance.
Bending deformation affects the installation and use of the pipe, and is especially prominent in long pipe production.
Análisis de la causa
(1) The cooling on all sides in the extrusion direction is uneven, and the shrinkage is inconsistent
(2) The haul-off device is not concentric with the die
(3) The cooling water tank is installed incorrectly or the water temperature is uneven
(4) The uneven wall thickness of the pipe causes different shrinkage in all directions
(5) The support after extrusion is improper, and the pipe bends due to its own weight
Solución
(1) Check the cooling system to ensure uniform cooling on all sides of the pipe
(2) Adjust the center line of the haul-off device to align 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 the mandrel to ensure uniform wall thickness
(5) Add pipe support rollers to reduce self-weight deformation
Conclusión clave
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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