ODOUR REDUCTION | TECHNOLOGY


“Previous work confirmed strong odour reduc- tion in rPP, rPS and HDPElignin systems under accelerated ageing. In SIMBA, these formulations are further optimised, characterised (mechanics, VOC, longterm odour) and transferred into thickwalled injection moulded demonstrators such as chair feet or armrests,” said Großhauser. He said that CCPE is currently establishing


collaborations with furniture associations and are actively seeking compounders, recyclers, additive suppliers and furniture component manufacturers interested in developing and testing odouroptimised PCR materials for office and publicspace furniture. In an earlier project called GINA - Odour Control Additives for Industrial Applications, researchers considered addition of odour scavenger additives into bulk materials and investigation their interac- tion with other additives. Odour property tests included both human sensory tests and online emission measurements to analyse VOCs.


Processing variables The Institute for Plastics Processing (IKV) at RWTH Aachen University has been leading a consortium in a project called Smellstop that aims to reduce odour


in post-consumer PE from packaging by optimising the mechanical recycling and compounding process. The project is funded by the German Federal Ministry of Education and Research in an initiative called Resource Efficient Circular Economy – Plastics Recycling Technologies (KuRT). The goal is to increase recycling rates and reduce downcycling so that rPE can be re-used in packaging films. IKV researchers are conducting processing tests and analysis of odour-causing substances. As described in the project announcement, other partners were Kreyenborg, which performed thermal pretreatment of the shredded PCR film pieces in an infrared rotary kiln; Coperion, which performed regranulation; Reifenhäuser Cast Sheet Coating, which produced cast films; and RKW, which produced blown films on an industrial scale. Siegwerk Druckfarben provided printing inks and adhesives as odour-causing “contaminants” and 3S provided technology for inline detection and quantification of odours. Deodourisation during the regranulation step was investigated, and the researchers looked at various compounding parameters and devolatilis- ing strategies.


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