Molding Process
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Material sticking to sizing sleeve of PVA extruded pipe
Problem Phenomenon
PVA extruded pipe sticks in the sizing sleeve, longitudinal adhesion marks appear on the inner wall
Cause Analysis
PVA soft, easily adheres to metal surfaces; sizing sleeve inner wall rough Ra>0.4μm; sizing sleeve cooling insufficient, surface temperature high, promoting adhesion
Solution
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
Key Takeaway
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are key
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