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Reprocessing study on dairy packaging.

机译：乳制品包装的后处理研究。

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The recycling of plastics used in dairy packaging is complicated by the presence of contaminants like aluminum foil, paper and food residue. The contamination has been shown to reduce the performance of the base plastic resin. It was thought that a recycling methodology could be developed to separate effectively the contaminants from the mixed plastics dairy packaging stream.; The objective of this thesis was to evaluate the properties of the dairy packaging at various levels of segregation and reprocessing. The materials which are primarily present in the mixed dairy stream are polypropylene, high impact polystyrene, high density polyethylene, foil and paper. This study mainly focuses on the reprocessing of polypropylene and high impact polystyrene.; Results showed that both materials are very recyclable in nature, and separation techniques like float sink and melt filtration are highly efficient in separation foil from the plastics mix. The study also showed that melt filtration and use of the grater mixer have little negative effect on the quality and properties of the material and, thus, it can be reprocessed again. However, the study on blends of the constituent resins indicated the need of a suitable compatibilizer since a drop in properties was observed.
机译：由于存在诸如铝箔，纸张和食物残渣之类的污染物，乳制品包装中使用的塑料的回收变得很复杂。已经表明，这种污染会降低基础塑料树脂的性能。认为可以开发一种回收方法，以有效地从混合的塑料乳制品包装流中分离出污染物。本文的目的是评估乳制品包装在不同水平的分离和后处理中的性能。混合乳制品流中主要存在的材料是聚丙烯，高抗冲聚苯乙烯，高密度聚乙烯，箔和纸。该研究主要集中在聚丙烯和高抗冲聚苯乙烯的后处理上。结果表明，这两种材料本质上都是可回收利用的，浮选池和熔体过滤等分离技术可高效地从塑料混合物中分离箔。研究还表明，熔体过滤和刨丝机的使用对物料的质量和性能几乎没有负面影响，因此可以再次进行加工。然而，对组成树脂的共混物的研究表明需要合适的增容剂，因为观察到性能下降。

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