Extrusion & Post
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Bending deformation of heat-resistant polyethylene extruded pipes (Variant: strengthened measures)
Problem Phenomenon
The pipe bends after extrusion and the straightness is out of tolerance.
Bending deformation affects pipe installation and use, and is especially prominent in long pipe production.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Cause Analysis
(1) Cooling uneven on each side of the extrusion direction, shrinkage inconsistent
(2) Haul-off device not concentric with the die
(3) Cooling water tank improperly installed or water temperature uneven
(4) Uneven pipe wall thickness causes different shrinkage in each direction
(5) Improper support after extrusion, pipe's own weight causes bending
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solution
(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 die center
(3) Correct the cooling water tank position, control uniform water temperature
(4) Adjust the concentricity of die and mandrel to ensure uniform wall thickness
(5) Add pipe support rollers to reduce self-weight deformation
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
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.
Targeted preventive measures need to be taken in different production scenarios.
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