Molding Process
6 مشاهدة
Sizing Device Failure of High-Density Polyethylene Extruder
ظاهرة المشكلة
After sizing of the pipe or profile, the dimensional deviation is large, and the roundness or cross-section shape is unqualified.
Sizing device failure leads to reduced product dimensional accuracy.
تحليل الأسباب
（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
الحل
（1）Check the vacuum pump and pipelines to ensure the vacuum degree is stable at 0.04-0.08MPa
（2）Check the sizing sleeve wear, 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
الخلاصة الأساسية
Sizing device failure needs to be solved from three aspects: vacuum system, cooling system, and mold precision.
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