Extrusion & Post
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Bending Deformation of PU Extruded Profiles
Problem Phenomenon
PU extruded profiles continuously bend after cooling, bending deviation >5mm/m
Cause Analysis
Cooling of profile faces uneven causing shrinkage differences; die exit flow velocity uneven making profile wall thicknesses different; haul-off and extrusion centerline misaligned producing lateral force
Solution
1) Optimize the cooling system to ensure uniform cooling of all faces; 2) Adjust the die to make flow velocity of each wall uniform and wall thickness consistent; 3) Align haul-off and extrusion centerline; 4) Increase sizing sleeve length, fully size then cool
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow velocity; homogenization and alignment are the solution keys
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