Extrusion & Post
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HDPE pipe outer diameter out of tolerance
Problem Phenomenon
The pipe outer diameter measurement exceeds the tolerance band, the whole batch is oversized or undersized, inconsistent with the nominal size of the sizing sleeve.
Cause Analysis
The vacuum degree directly changes the tightness of the pipe blank attaching to the sizing sleeve, thereby affecting the outer diameter; changes in haul-off speed and wear of the sizing sleeve inner hole also cause outer diameter drift.
Solution
①Fine-tune the outer diameter by adjusting the vacuum degree; ②change the haul-off speed for coordinated adjustment; ③test and correct the sizing sleeve inner hole dimension; ④stabilize the extrusion output to avoid fluctuation.
Key Takeaway
Outer diameter control relies on the linkage of the three elements: vacuum degree, haul-off speed, and sizing sleeve; for outer diameter drift, first check sizing sleeve wear, then check the stability of vacuum and haul-off.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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