Extrusion & Post
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Material Sticking to Sizing Sleeve in PU Pipe Extrusion
Fenómeno del problema
PU extruded pipe sticks in the sizing sleeve, longitudinal adhesion marks on the inner wall
Análisis de la causa
PU soft, easily adheres to metal surfaces; sizing sleeve inner wall rough Ra>0.4μm; sizing sleeve cooling insufficient, surface temperature too high promoting adhesion
Solución
1) Polish sizing sleeve inner wall to Ra<0.2μm; 2) Fully water-cool sizing sleeve surface <30°C; 3) Pass lubricating water containing 0.1% silicone oil emulsion through the sizing sleeve; 4) Apply a thin layer on the pipe surface to reduce adhesion
Conclusión clave
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are key
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