Molding Process
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Sizing device failure of general-purpose polyethylene extruder
Fenómeno do problema
After sizing, the dimensional deviation of the pipe or profile is large, and the roundness or cross-sectional shape is unqualified.
Sizing device failure leads to reduced dimensional accuracy of the product.
Análise das causas
（1）The vacuum degree of the vacuum sizing sleeve is insufficient or unevenly distributed
（2）The sizing sleeve is worn, and the inner diameter becomes larger
（3）The cooling water flow is insufficient or the temperature is too high
（4）The sizing sleeve is not concentric with the die
（5）There is scale or impurities on the inner wall of the sizing sleeve
Solução
（1）Check the vacuum pump and pipelines to ensure that the vacuum degree is stable at 0.04-0.08MPa
（2）Check the wear of the sizing sleeve, and replace it if it exceeds the tolerance
（3）Increase the cooling water flow and control the water temperature at 15-25°C
（4）Adjust the concentricity of the sizing sleeve and the die
（5）Regularly clean the inner wall of the sizing sleeve to remove scale
Conclusão principal
Sizing device failure needs to be solved from three aspects: vacuum system, cooling system, and mold accuracy.
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