The mechanical properties of mechanically recycled polyethylene (rPE) were studied in relation to the composition of the feedstock. This composition varied in six steps from only bottle bodies from a single type of high‐density polyethylene (HDPE) to the complete composition of an industrially sorted polyethylene (PE) product, including other packaging components, other PE‐based packages, sorting faults and residual waste. The rPE with the highest impact resistance was made from the single‐grade bottle bodies. The addition of bodies made from other types of PE already reduced the impact resistance with 11%. All the other stepwise additions of packaging components and faultily sorted objects caused the impact resistance to decrease further. Conversely, the elongation at break grew with the stepwise addition of these packaging components and faultily sorted objects. From the used methods, the best analysis method to accurately determine the polymeric composition of the rPE was found to be near‐infrared‐assisted flake analysis. This method can not only be used to determine the polymeric composition, but due to the strong correlation with the impact resistance, it is also a valuable indicator for the expected mechanical properties of rPE.

中文翻译：

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杂质对再生聚乙烯机械性能的影响

研究了与原料组成有关的机械回收聚乙烯（rPE）的机械性能。从单一瓶身到单一类型的高密度聚乙烯（HDPE）到工业分选聚乙烯（PE）产品的完整组成（包括其他包装组件，其他基于PE的包装，分选错误和残留废物。耐冲击性最高的rPE是由单级瓶身制成的。由其他类型的PE制成的阀体的添加已经使抗冲击性降低了11％。所有其他逐步添加的包装组件和错误分类的物品都导致抗冲击性进一步降低。反过来，这些包装成分和错误分类的物品的逐步添加，使断裂伸长率增加。从所使用的方法中，发现准确确定rPE聚合物组成的最佳分析方法是近红外辅助薄片分析。该方法不仅可以用于确定聚合物的组成，而且由于其与抗冲击性的强相关性，对于rPE的预期机械性能也是有价值的指标。