TECHNOLOGY | ODOUR AND EMISSIONS
own laboratory. And deodorisation can be per- formed with very small amounts of product (as little as 10 litres per test run). The mobile deodorisation unit is delivered as a stand-alone solution that only needs to be plugged into water, compressed air and power for it to run. “The customer is assured in advance that the desired quality of the recyclate will be achieved with the Coperion solution,” says Weischer. The use of recycled plastics in the automotive industry has been always a challenge, says Luis Roca, Leader of Compounding at Spanish research organisation Aimplas. The difficulty of obtaining the right mechanical properties, colour, and rheology, together with issues of volatiles and odour, has traditionally acted as a brake on development. However, circular economy policies and new consumer perceptions over environmen- tal issues are causing the foot to come off the pedal, he says. Roca points to examples of recycled plastics being used by major OEMs in diverse elements such as wheel covers (Chrysler), bumpers (Honda, Ford, Nissan), and radiator covers (General Motors). However, he says there are very few examples in
interior applications – he cites seat cushions made from recycled polyurethane foam (Chrysler) and fibres for upholstery (Ford, Nissan) among the few examples. “The main reason is that OEMs have strict restrictions on the quality of materials used in the vehicle interior and most of the published standards refer to virgin materials and the require- ments are the same for virgin and recycled materi- als,” Roca says. Aimplas has attempted to address the situation with the development of a methodology to improve the recyclability and recovery of polypro- pylene waste intended for incorporation into interior components. In particular, this aims to take care of emissions to enable compliance with requirements for air quality inside the vehicle specified by the vehicle manufacturers. As part of the project, Aimplas developed a
means for improving the devolatilisation process of the twin screw extruder by adding different percentages of water. “The optimisation of the processing conditions combined with the screw profile modification makes the difference to reduce volatile contents and hence odours,” Roca says. To determine the efficiency of recycling and the
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