Extrusion & Post
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EVOH Extruded Pipe Ovality Out of Specification
Problem Phenomenon
EVOH extruded pipe ovality >1.05 exceeds the 1.02 standard requirement
Cause Analysis
Pipe cooling uneven, single-side cooling; sizing sleeve design unreasonable; haul-off clamping force uneven causing pipe deformation under pressure
Solution
1) Use annular spray cooling to ensure uniform temperature reduction; 2) Optimize sizing sleeve inner diameter and taper design; 3) Multi-track uniform clamping haul-off; 4) Increase vacuum sizing section length to ensure full sizing
Key Takeaway
Ovality is caused by uneven cooling and clamping; annular cooling and uniform haul-off are key
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