Processing Machinery
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Heat-resistant polyethylene pipe pressure resistance test failure
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and the pressure resistance does not meet the standard.
Failure of pressure resistance directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
Cause Analysis
(1) Pipe wall thickness insufficient or uneven
(2) Material degradation causes molecular weight reduction
(3) Bubbles or impurities in the pipe
(4) Unsuitable crystallinity, poor mechanical properties
(5) Melt plasticization insufficient, poor welding
Solution
(1) Check and adjust pipe wall thickness to ensure uniform wall thickness at all parts meets the standard
(2) Control extrusion temperature within 190-230°C to avoid material degradation
(3) Fully dry raw materials, ensure raw materials are clean
(4) Optimize cooling conditions to ensure suitable heat-resistant polyethylene crystallinity
(5) Optimize screw design to ensure full 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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