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ODOURS AND EMISSIONS | TECHNOLOGY


Testing times for odour


Tackling the problems of odour and VOC emissions from plastics requires a multi-pronged approach that ranges from additives to sophisticated testing. Mark Holmes reports


Bad odour and volatile organic compound (VOC) emissions from plastic compounds can lead to problems in a wide range of applications from food packaging to vehicle interiors. Looking ahead, the increasing use of recycled polymers mean these challenges will only intensify. Fortunately, there are additive solutions available to counter these unwanted odours and testing equipment that can help quantify the problem. “Emissions from plastic components are gener- ally not desirable,” says Jörg Garlinsky, Head of End Use Thermoplastics - Industrial Applications at Byk. “To prevent these emissions, adsorbers can be used that bind the VOCs and keep them in the plastic. However, under certain conditions, these compounds may still be released.” Galinsky says the company has taken a different approach in the creation of its latest BYK-P 4200


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additive. “As an entrainer, it mixes with the unwant- ed VOCs and is excreted together with the VOCs during the degassing phase of compounding. The benefit is that substances that are no longer present in the material can no longer be emitted at a later time,” Garlinsky explains. “The additive concept from Byk enables the component of unwanted VOCs and odours to be significantly reduced during compounding,” he says. “The fundamental principles of ‘entrainers’ form the basis for the additive. Its molecular structure is such that it becomes active in the melt at the interface of the granulates during the compounding process, which almost completely separates the VOCs from the granulate. The resulting mix of VOCs and additive carrier sub- stance is separated in the form of steam during the degassing phase of compounding.”


Main image: Checking and controlling odour in plastics requires both instrumental and organolep- tic analysis, according to Austrian masterbatch maker Gabriel- Chemie


� March 2021 | COMPOUNDING WORLD 49


IMAGE: GABRIEL-CHEMIE


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