Extrusion & Post
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EEA extrusion profile bending deformation
Problem Phenomenon
EEA extruded profiles show continuous bending after cooling, deflection >5mm/m
Cause Analysis
Uneven cooling of each face of the profile causing shrinkage difference; uneven die outlet flow velocity making each wall thickness of the profile different; haul-off and extrusion centerlines not aligned producing lateral force
Solution
1) Optimize the cooling system to ensure uniform cooling of each face; 2) Adjust the die to make the flow velocity of each wall uniform and wall thickness consistent; 3) Align the haul-off and extrusion centerlines; 4) Increase the sizing sleeve length, cool after full setting
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow velocity; homogenization and alignment are the key to resolution
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