Extrusion & Post
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HDPE Double-wall Corrugated Pipe
Problem Phenomenon
Corrugated pipe inner and outer walls weld poorly and delaminate
Cause Analysis
Insufficient welding temperature or pressure in two-layer extrusion causes weak interlayer bonding; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Optimize welding temperature and pressure; online welding quality monitoring; sample check of ring stiffness; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Corrugated pipe interlayer welding relies on parameters and monitoring; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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