Extrusion & Post
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Bending deformation of EVA extruded profiles
Problem Phenomenon
EVA extruded profiles continuously bend after cooling with deflection >5mm/m
Cause Analysis
Uneven cooling on each face of the profile causes shrinkage differences; uneven die exit flow velocity makes each wall thickness of the profile different; haul-off and extrusion centerline misaligned producing lateral force
Solution
1) Optimize cooling system to ensure uniform cooling on each face; 2) Adjust die to make each wall flow velocity uniform and wall thickness consistent; 3) Align haul-off with extrusion centerline; 4) Increase sizing sleeve length to cool after full sizing
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow velocity; homogenization and alignment are the key to solution
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