Processing Machinery
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Pressure resistance test failure of low density polyethylene pipes
Problembeschreibung
Pipes rupture or leak in hydraulic tests, pressure resistance not up to standard.
Pressure test failure directly threatens pipe use safety, and is a fatal defect in water supply and gas pipelines.
Ursachenanalyse
(1) Insufficient or uneven pipe wall thickness
(2) Material degradation reduces molecular weight
(3) Bubbles or impurities inside the pipe
(4) Inappropriate crystallinity, poor mechanical properties
(5) Insufficient melt plasticization, poor fusion
Lösung
(1) Check and adjust pipe wall thickness, ensure uniform wall thickness meeting standards in all parts
(2) Control extrusion temperature within the 160-220°C range, avoid material degradation
(3) Fully dry raw material, ensure raw material cleanliness
(4) Optimize cooling conditions, ensure appropriate low density polyethylene crystallinity
(5) Optimize screw design, ensure full plasticization
Wichtigste Erkenntnis
Pressure test failure is caused by insufficient wall thickness, material degradation, or internal defects; it needs to be systematically solved from process and material quality.
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