Molding Process
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Sizing device failure of heat-resistant polyethylene extruder
Problem Phenomenon
After sizing, the pipe or profile has large dimensional deviation, and the roundness or cross-sectional shape is unqualified.
Sizing device failure leads to reduced product dimensional accuracy.
Cause Analysis
(1) Vacuum degree of vacuum sizing sleeve insufficient or unevenly distributed
(2) Sizing sleeve worn, inner diameter enlarged
(3) Cooling water flow insufficient or temperature too high
(4) Sizing sleeve not concentric with the die
(5) Scale or impurities on sizing sleeve inner wall
Solution
(1) Check the vacuum pump and piping to ensure the vacuum degree is stable at 0.04-0.08MPa
(2) Check sizing sleeve wear, replace if exceeding tolerance
(3) Increase cooling water flow, control water temperature at 15-25°C
(4) Adjust the concentricity of sizing sleeve and die
(5) Regularly clean the sizing sleeve inner wall to remove scale
Key Takeaway
Sizing device failure needs to be solved from the three aspects of vacuum system, cooling system and mold accuracy.
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