Extrusion & Post
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EVOH extruded profile bending deformation
Problem Phenomenon
EVOH extruded profile shows continuous bending after cooling, bending amount >5mm/m
Cause Analysis
Uneven cooling of profile faces causing shrinkage differences; uneven die exit flow velocity making profile wall thicknesses different; traction 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 traction and extrusion centerlines; 4) Increase sizing sleeve length for cooling after full shaping
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow velocity; uniformization and alignment are the key to solution
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