Processing Machinery
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Pressure Resistance Test Failure of High-Density Polyethylene Pipes
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and the pressure resistance performance is not up to standard.
Pressure resistance failure directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
Cause Analysis
（1）The pipe wall thickness is insufficient or uneven
（2）Material degradation leads to reduced molecular weight
（3）There are bubbles or impurities in the pipe
（4）The crystallinity is unsuitable, and the mechanical properties are poor
（5）The melt plasticization is insufficient, and the fusion is poor
Solution
（1）Check and adjust the pipe wall thickness to ensure the wall thickness of all parts is uniform and up to standard
（2）Control the extrusion temperature within the 180-260°C range to avoid material degradation
（3）Fully dry the raw material and ensure the raw material is clean
（4）Optimize the cooling conditions to ensure suitable crystallinity of the high-density polyethylene
（5）Optimize the screw design to ensure sufficient plasticization
Key Takeaway
Pressure resistance failure is caused by insufficient wall thickness, material degradation, or internal defects, and needs to be systematically solved from process and material quality.
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