Processing Machinery
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HDPE pipe roundness out of tolerance
Problem Phenomenon
The pipe cross-section is elliptical, roundness test is out of tolerance, and a reliable seal cannot be formed during connection.
Cause Analysis
Improper nozzle angles of the vacuum sizing machine and spray tank cause uneven cooling; water temperature exceeding 35°C makes cooling insufficient; the sizing sleeve inner hole loses roundness or the guide clamping device compresses and deforms it.
Solution
①Adjust the nozzle angle for uniform circumferential cooling; ②add a chilled water system when water temperature >35°C; ③clean the water circuit and filter; ④calibrate the sizing sleeve inner hole roundness and adjust the guide device.
Key Takeaway
Roundness problems mostly originate from uneven cooling and sizing precision; after verifying the three places of nozzle angle, water temperature, and sizing sleeve, the ovality can usually be restored to within the tolerance range.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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