Extrusion & Post
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Material Sticking to Sizing Sleeve in PU Pipe Extrusion
Problem Phenomenon
PU extruded pipe sticks in the sizing sleeve, longitudinal adhesion marks on the inner wall
Cause Analysis
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
Solution
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
Key Takeaway
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are key
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