Extrusion & Post
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Glass Fibre extruded profile bending deformation
Problem Phenomenon
Glass Fibre extruded profile after cooling shows continuous bending, deflection >5mm/m
Cause Analysis
Profile faces cooled unevenly 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 cooling system to ensure uniform cooling of each face; 2) adjust die to make each wall flow velocity uniform and wall thickness consistent; 3) align haul-off and extrusion centerline; 4) increase sizing sleeve length, cool after full sizing
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow velocity; uniformization and alignment are the solution key
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