Processing Machinery
3 views
Polyolefin plastomer pipe pressure resistance test unqualified (Variant: Enhanced Measures)
Problem Phenomenon
The pipe ruptures or leaks in the hydraulic test, and the pressure resistance performance is not up to standard.
Unqualified pressure resistance directly threatens the safety of pipe use and is a fatal defect in water supply and gas pipelines.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
（1）The pipe wall thickness is insufficient or uneven
（2）Material degradation causes the molecular weight to decrease
（3）There are bubbles or impurities in the pipe
（4）The crystallinity is inappropriate and the mechanical properties are poor
（5）The melt plasticization is insufficient and the welding is poor
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
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 180-230°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 the crystallinity of the polyolefin plastomer is appropriate
（5）Optimize the screw design to ensure sufficient plasticization
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Key Takeaway
Unqualified pressure resistance is caused by insufficient wall thickness, material degradation, or internal defects, and needs to be solved systematically from process and material quality.
Targeted preventive measures need to be taken in different production scenarios.
Was this helpful?
0 people found this helpful
Thank you for your feedback!