Processing Machinery
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HDPE geomembrane
Problem Phenomenon
The welded joints of the HDPE geomembrane leak, or stress cracking causes anti-seepage failure
Cause Analysis
Mismatched geomembrane welding temperature and speed make the weld strength insufficient; laying stress and uneven foundation settlement produce long-term stress; cracking occurs when ESCR is insufficient; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize the welding parameters according to the membrane thickness and perform peel tests; ②reserve slack during laying to prevent stress concentration; ③select a high ESCR geotechnical special grade; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The reliability of HDPE geomembrane lies in weld and stress management; welding verification and laying process are equally important; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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