Extrusion & Post
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PE Pipe Ovality and Wall Thickness Unevenness
Fenómeno del problema
HDPE/PE pipe cross-sections are elliptical, or the circumferential wall thickness deviation is large, affecting butt fusion welding and laying quality.
Análisis de la causa
Insufficient vacuum sizing, uneven cooling or mismatch between the haul-off speed and extrusion speed causes ovality; improper die adjustment, die and mandrel misalignment and uneven melt flow cause wall thickness unevenness; the self-weight sagging of large-diameter pipes superimposes.
Solución
①Adjust the vacuum degree of the vacuum tank and ensure uniform circumferential cooling; ②synchronize the extrusion and haul-off speeds; ③regularly check and adjust the die bolts and correct the die-mandrel concentricity; ④correct the sizing sleeve dimensions; ⑤coordinate with online thickness and ovality detection.
Conclusión clave
PE pipe ovality and wall thickness are jointly determined by 'sizing + cooling + haul-off + die concentricity': first get the die concentricity and sizing right, then stabilize the synchronization of extrusion and haul-off, and only then can the geometric accuracy be guaranteed.
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