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ODOURS AND EMISSIONS | TECHNOLOGY


Pressure build-up in the extrusion process leads to degassing of undesirable VOCs during processing


Image: Byk


talc was directly dosed into the melt of the same PP via a side feeder. In this case, the additive was incorporated together with the filler. In addition to vacuum degassing at the end of the extrusion process, atmospheric degassing was applied upstream at the inlet point of the talc. Sweden’s Nexam Chemical has developed two odour neutralising products, which it is offering in masterbatch form to enable recycling of polyolefin materials. Nexamod OS01 is an odour scavenging masterbatch designed for use in a wide range of polymer recycling applications, including post- consumer. Typical dosing levels range from 3-10%, with the company claiming a 5% loading in rHDPE improving the olefactory profile from 5.0 to 2.5 on the VDA 270 test scale. Nexamod OS02 offers similar performance but incorporates an antioxi- dant. Both products are suitable for food contact applications.


Sensitive solutions Austrian masterbatch specialist Gabriel-Chemie says it has developed a solution that focuses on the odours and emissions of sensitive plastic products. “In sensitive products, such as mineral water bottles and caps for example, a consumer would immedi- ately detect a flavour impairment caused by the packaging,” says Mark Hannah, Head of Corporate Marketing. “This could lead to consumer complaints and result in product recalls or, in the worst-case scenario, damage to the public reputation of the brand. It is often hard to trace in which part of the value chain the problem was caused – beginning with the raw materials and ending at the consumer.” It developed its PURE service package in


combination with plastics converters and leading brands within the food and beverage industry, It is based on two test methods – recognised as standards within the industry – for testing of


www.compoundingworld.com March 2021 | COMPOUNDING WORLD 53


incoming and outgoing products. “There is NIAS [Non-Intentionally Added Substance] analysis of incoming raw materials using our in-house headspace gas chromatograph and, where necessary, mass spectrometer,” says Hannah. “We have built up a database of mol- ecules that could potentially cause taste or odour impairment together with Fraunhofer IVV and scan incoming raw materials for these molecules. Potential problems can be identified before the raw materials are processed.” With the latest gas chromatography, Gabriel- Chemie says that it is able to test all materials for the presence of volatile, organoleptically relevant NIAS. Concentrations of non-approved substances that are noteworthy in the chromatogram are analysed by means of mass spectrometry. Should a suspicious substance be relevant to the risk assessment, the raw material that led to the introduction of the substance is determined and alternative raw materials are tested. Once all concentrations are below the substance-specific, organoleptically relevant concentration, a certifi- cate including a detailed analysis is issued.





Below: Gabriel- Chemie’s PURE concept aims to tackle both odour and flavour


contamination


IMAGE: GABRIEL-CHEMIE


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