Processing Machinery
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Pressure Test Failure of Polypropylene Pipe
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and the pressure resistance is not up to standard.
Pressure test failure directly threatens the use safety of the pipe 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 a decrease in 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 each part is uniform and up to standard
(2) Control the extrusion temperature within the range of 200-280°C to avoid material degradation
(3) Fully dry the raw material to ensure the raw material is clean
(4) Optimize the cooling conditions to ensure suitable crystallinity of polypropylene
(5) Optimize the screw design to ensure full plasticization
Key Takeaway
Pressure test 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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