Processing Machinery
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Pressure resistance test failure of homopolymer polypropylene pipes
Problem Phenomenon
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.
Cause Analysis
(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
Solution
(1) Check and adjust pipe wall thickness, ensure uniform wall thickness meeting standards in all parts
(2) Control extrusion temperature within the 200-280°C range, avoid material degradation
(3) Fully dry raw material, ensure raw material cleanliness
(4) Optimize cooling conditions, ensure appropriate homopolymer polypropylene crystallinity
(5) Optimize screw design, ensure full plasticization
Key Takeaway
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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