Molding Process
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Material sticking to sizing sleeve of EVA extruded pipe
Problem Phenomenon
EVA extruded pipe sticks in sizing sleeve with longitudinal sticking marks on inner wall
Cause Analysis
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
Solution
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
Key Takeaway
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are key
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