Extrusion & Post
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Bending deformation of PVA extruded profile
Problem Phenomenon
PVA extruded profile continuously bends after cooling, bending deviation >5mm/m
Cause Analysis
Uneven cooling of each face of the profile causes shrinkage difference; uneven die outflow velocity makes each wall thickness of the profile different; haul-off and extrusion centerlines misaligned, producing lateral force
Solution
1) Optimize cooling system to ensure uniform cooling of each face; 2) Adjust the die so that flow velocity of each wall is uniform and wall thickness consistent; 3) Align haul-off and extrusion centerlines; 4) Increase sizing sleeve length, 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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