Extrusion & Post
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Ovality of PU extruded pipe exceeding standard
Problem Phenomenon
Ovality of PU extruded pipe >1.05, exceeding the 1.02 standard requirement
Cause Analysis
Uneven pipe cooling, single-side cooling; unreasonable sizing sleeve design; uneven haul-off clamping force causing pipe deformation under pressure
Solution
1) Adopt annular spray cooling to ensure uniform cooling; 2) Optimize sizing sleeve inner diameter and taper design; 3) Multi-caterpillar 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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