Processing Machinery
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Sizing device failure of heat-resistant polyethylene extruder (Variant: strengthened measures)
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.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
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
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
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
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Key Takeaway
Sizing device failure needs to be solved from the three aspects of vacuum system, cooling system and mold accuracy.
Targeted preventive measures need to be taken in different production scenarios.
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