Extrusion & Post
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Random copolymer polypropylene pipe special material (Nordic standard） extruded pipe bending deformation（Variant: Mass Production Scenario）
Problembeschreibung
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.In particular, during continuous mass production, this problem is more prominent and requires key attention.
Ursachenanalyse
（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\
（6）In continuous mass production, process parameter fluctuations or equipment status changes aggravate this problem
Lösung
（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\
（6）And establish standardized work instructions, paying special attention to parameter stability in continuous mass production
Wichtigste Erkenntnis
Pipe bending is caused by non-uniform cooling or haul-off eccentricity, and needs to be solved from cooling uniformity and equipment alignment.Targeted preventive measures need to be taken in different production scenarios.
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