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Analysis of different polypropylene waste bales - evaluation of the source material for polypropylene recycling

In 2020 Polypropylene (PP) accounted for almost 20% of the plastic consumption in Europe, making it the second most used plastic (Plastics Europe 2021). Due to the high volume of PP used as packaging material (Plastics Europe 2021), large amounts of PP waste are generated every year. Therefore, mechanical recycling of PP waste is a crucial step towards a circular economy. Although there are already some well-established recycling techniques, the lower quality of recyclates compared to virgin materials still poses an obstacle for their use in more demanding applications. Improvements of every step of the whole recycling value chain could solve this problem, with proper and more accurate sorting techniques being particularly crucial.

Given the large amount of PP waste generated every year, mechanical recycling ofpost-consumed PP products is essential. However, the use of the thereof obtained recyclates inmore demanding applications is still restricted by their quality. To determine possible reasons forthe low and inconsistent quality of recyclates depending on the source material, the aim of thiswork was to investigate different PP waste bales ('pure�, mixed with other polymers), commerciallyavailable at different sorting centres. The amount of PP, the content of contaminations (polymericand foreign impurities) as well as the ratio of differently processed PP products was investigatedfour times a year. The analysis showed that up to 13% of PE is present in 'pure� PP bales.Furthermore, a considerable amount of impurities was found in some bales. The sorting of theobtained PP samples according to their processing methods indicated seasonal fluctuation, whichmay be one reason for inconsistent recyclate quality. These results highlight the importance of proper sorting and treatment of PP waste bales before reprocessing.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Recy & Depotech 2022 (November 2022)
Seiten:	4
Preis:	€ 2,00
Autor:	Jutta Geier Márton Bredács Dipl.-Ing Andreas Witschnigg Assoz.Prof. Dipl.-Min. Dr.rer.nat. Daniel Vollprecht Dipl.-Ing. Dr. Gernot Oreski
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