Molding Process
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Material sticking to sizing sleeve of EVA extruded pipe
Fenómeno del problema
EVA extruded pipe sticks in sizing sleeve with longitudinal sticking marks on inner wall
Análisis de la causa
EVA soft and easily adheres to metal surface; sizing sleeve inner wall rough Ra>0.4μm; sizing sleeve insufficiently cooled with high surface temperature promoting adhesion
Solución
1) Polish sizing sleeve inner wall to Ra<0.2μm; 2) Fully water-cool sizing sleeve with surface <30°C; 3) Pass lubricating water containing 0.1% silicone oil emulsion through sizing sleeve; 4) Coat thin layer on 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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