Molding Process
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Material sticking to sizing sleeve of PVA extruded pipe
Problembeschreibung
PVA extruded pipe sticks in the sizing sleeve, longitudinal adhesion marks appear on the inner wall
Ursachenanalyse
PVA soft, easily adheres to metal surfaces; sizing sleeve inner wall rough Ra>0.4μm; sizing sleeve cooling insufficient, surface temperature high, promoting adhesion
Lösung
1) Polish sizing sleeve inner wall to Ra<0.2μm; 2) Fully water-cool the sizing sleeve, surface <30°C; 3) Pass lubricating water containing 0.1% silicone oil emulsion through the sizing sleeve; 4) Apply thin coating on pipe surface to reduce adhesion
Wichtigste Erkenntnis
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are key
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