Extrusion & Post
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MP extruded profile bending deformation
Problem Phenomenon
MP extruded profiles continuously bend after cooling, bending deviation >5mm/m
Cause Analysis
uneven cooling on each surface of the profile causes shrinkage difference; uneven die exit flow velocity makes profile wall thicknesses different; haul-off and extrusion centerlines misaligned producing lateral force
Solution
1) optimize the cooling system to ensure uniform cooling on all surfaces; 2) adjust the die so each wall has uniform flow velocity and consistent wall thickness; 3) align haul-off and extrusion centerlines; 4) increase calibrating sleeve length, cool after full calibration
Key Takeaway
profile bending is caused by uneven cooling and uneven flow velocity; homogenization and alignment are the keys to solving
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