Processing Machinery
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Random copolymer polypropylene pipe special material (Nordic standard） extruder sizing device failure（Variant: Mass Production Scenario）
Problem Phenomenon
After sizing, the pipe or profile has large dimensional deviations, and the roundness or cross-sectional shape is unqualified.
Sizing device failure causes product dimensional accuracy to decrease.In particular, during continuous mass production, this problem is more prominent and requires key attention.
Cause Analysis
（1）The vacuum sizing sleeve vacuum degree is insufficient or unevenly distributed\
（2）The sizing sleeve is worn, the inner diameter becomes larger\
（3）Cooling water flow insufficient or temperature too high\
（4）The sizing sleeve is not concentric with the die\
（5）The sizing sleeve inner wall has scale or impurities\
（6）In continuous mass production, process parameter fluctuations or equipment status changes aggravate this problem
Solution
（1）Check the vacuum pump and piping, ensure the vacuum degree is stable at 0.04-0.08MPa\
（2）Check sizing sleeve wear, replace if beyond tolerance\
（3）Increase cooling water flow, control water temperature at 15-25°C\
（4）Adjust the concentricity of the sizing sleeve and the die\
（5）Regularly clean the sizing sleeve inner wall, remove scale\
（6）And establish standardized work instructions, paying special attention to parameter stability in continuous mass production
Key Takeaway
Sizing device failure needs to be solved from three aspects: vacuum system, cooling system and mold precision.Targeted preventive measures need to be taken in different production scenarios.
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