Effect of recycled content and rPET quality on the properties of PET bottles, part III: Modelling of repetitive recycling,Packaging Technology and Science

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Effect of recycled content and rPET quality on the properties of PET bottles, part III: Modelling of repetitive recycling
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2020-08-03 , DOI: 10.1002/pts.2489
Marieke T. Brouwer _{1,

2} , Fresia Alvarado Chacon ₂ , Eggo Ulphard Thoden van Velzen _{1,

2}

Affiliation

The presence of contaminants in polyethylene terephthalate (PET) bottles and derived materials from the various steps in the recycling loop is studied. Based on these measurements, a model is proposed to generically describe the accumulation of these contaminants within closed‐loop recycling schemes for PET bottles. The measured levels of particle contamination and chlorine content of PET bottles, pellets, and intermediate recycling products are used to derive the modelling parameters. Previously determined relations between these measured parameters and critical bottle properties are used to model the effect of the accumulation of the contaminants on the bottle properties. The measurements reveal that the type of collection system influences the accumulation of contaminants in PET bottles greatly. PET bottles in mono‐collection systems accumulate less contaminants than PET bottles in co‐collection systems do. Therefore, PET bottles within recycling schemes using mono‐collection systems can contain more recycled content than those from co‐collection systems, without exceeding acceptation limits on critical bottle properties such as haziness, yellowing, and migration.

中文翻译：

回收物含量和rPET质量对PET瓶性能的影响，第三部分：重复回收的建模

研究了聚对苯二甲酸乙二醇酯（PET）瓶中污染物的存在以及循环回路中各个步骤衍生的材料的存在。基于这些测量结果，提出了一个模型来概括描述PET瓶闭环回收方案中这些污染物的积累。PET瓶，颗粒和中间回收产品的颗粒污染物和氯含量的测量水平可用于得出建模参数。这些测得的参数与瓶的关键特性之间的先前确定的关系用于对污染物积累对瓶特性的影响进行建模。测量表明，收集系统的类型极大地影响了PET瓶中污染物的积累。单收集系统中的PET瓶所累积的污染物少于共收集系统中的PET瓶。因此，在采用单收集系统的回收计划中，PET瓶所含的回收物含量要比来自联合收集系统的PET瓶中的回收物含量高，而不会超出对瓶的关键特性（如雾度，泛黄和迁移）的接受限制。

更新日期：2020-08-03

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