Molds & Tooling
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HDPE pipe wall thickness unevenness
Problem Phenomenon
The wall thickness of the same pipe cross-section is thin at top and thick at bottom or deviates left and right, and ultrasonic thickness measurement shows deviation out of tolerance.
Cause Analysis
Loosening or displacement of the mold wall thickness adjustment bolts causes uneven discharge; inconsistent vacuum sizing and spray cooling also pulls the wall thickness off, requiring mold disassembly to check the fastening state.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Adjust the wall thickness on the mold; ②adjust the nozzle angle and the water outlet uniformity of the sizing sleeve; ③disassemble and inspect the mold and re-tighten the internal screws; ④monitor with four-point ultrasonic thickness measurement.
Key Takeaway
Wall thickness unevenness should be divided into two categories: uneven discharge and cooling pull-off; tightening mold bolts plus uniform cooling, combined with online thickness measurement, can stabilize the wall thickness distribution.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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