This paper describes an investigation into the effect of insufficient homogenization of pigmented resin in polyethylene (PE) pipes on the integrity of the subsequent butt fusion joints and the development of a test to quantify the amount of windows in the pipe. Analysis was carried out on a number of PE pipes, made using both pre-compounded and in-line compounded resin on the same pipe extruder but using different extrusion conditions to obtain different degrees of homogenization. Tensile tests using waisted tensile specimens were carried out on the butt fusion joints from these pipes. It was found that the level of windows increased with decreasing degree of homogenization in PE pipes. The energy to break and extension to break of the butt fusion joints reduced with increasing level of windows. The higher the level of windows in pipe walls, the more the butt fusion joints tended to fracture in a brittle mode.

中文翻译：

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聚乙烯管材挤出过程中均质不足对对接接头完整性的影响

本文描述了对聚乙烯（PE）管中的着色树脂均质化不足对随后的对接熔接接头完整性的影响的研究，以及量化管中窗口数量的测试的发展。在同一台管道挤出机上使用预混合树脂和在线混合树脂对许多PE管道进行了分析，但是使用了不同的挤出条件以获得不同的均质度。在这些管道的对接熔接点上，使用腰部拉伸试样进行了拉伸试验。已经发现，随着PE管的均匀化程度的降低，窗口的水平会增加。随着窗口水平的增加，对接熔接处的断裂能量和断裂延伸能量降低。管壁上的窗户水平越高，