INNOVATION | ODOUR REDUCTION
Right: Kreyenborg’s two-stage IR-Fresh system
technology has brought to the fore its newest member among its products, the IR-Fresh, for odour reduction. In the first process step, an
IMAGE: KREYENBORG
infrared module installed above a material bed heats the material passing along a drum. Continu- ous rotation of the drum ensures a homogeneous mass flow with a defined dwell time (applying the first-in/first-out principle). Mixing elements ensure that the material is continuously mixed in the drum with constant surface exchange. “Combined with controlled heating, this ensures considerable odour elimination, even within a very short resi- dence time,” says Kreyenborg. In the second process step, the remaining
Below: Bandera RevoTech VOC and Odour Removal system uses microwave technology to reduce odours in batches of granules that have been cooled after granulation
odorous substances in the regrind or granules are removed by a thermal-physical cleaning process in the IR-Fresh Conditioner. This insulated hopper keeps the material to be decontaminated at a temperature range ideal for the decontamination process by means of a hot purge-gas. “Excellent results for deodorisation and decontamination can be achieved through the interaction of the main process parameters of airflow, temperature, and residence time,” says the company. The IR-Fresh system has a modular design, so it can be used continuously in two stages both for regrind - before the extrusion process - and for granules after the extrusion process. It is possible to either integrate the IR-Fresh Conditioner as an individual step in the process chain or to operate it as an independent, stand-alone solution either continuously or discontinuously. The IR-Fresh system is also suitable as a retrofit solution for integration in existing plants. Kreyenborg says it can develop a solution that is optimally tailored to the individual customer’s process. Erema points to its ReFresher technology for
reducing odour downstream of the extrusion process. The company highlights how the combi-
nation of its Intarema TVEplus RegrindPro machine with the ReFresher, is enabling PCR-HDPE to be used in proportions of up to 100% in packaging for direct contact with food and beverages, in con- formance with FDA regulations. The company has an extruder-ReFresher
combination for industrial-scale customer testing in the expanded customer centre at the group’s headquarters in Ansfelden, Austria. For carrying out tests at the customer’s plant, Erema also offers a compact and mobile ReFresher module that can be integrated into the on-site recycling process. Bandera says the most frequent quality factor
requested by players in the recycling market relates to removal of VOCs and accompanying odours. “Thanks to the outstanding vacuum degassing performance, Bandera RevoTech solutions – both Twin and Tandem – represent the most advanced instruments to guarantee excellent purification levels of the material in molten state,” it claims. “The forced extraction of intrinsic contami- nants is significant and tangible.” The company says that to further improve quality
levels, it recently finalised its RevoTech VOC & Odor Removal process dedicated to the pelletised material coming from its extrusion lines. Four systems have already been installed at customers. Bandera says the innovative odour extraction method, offers extremely lower residence time and relevant power saving compared to the alternatives. “RevoTech VOC & Odor Removal is based on a special stripping system equipped with microwave emitters that stimulate the internal VOC molecules and their evacuation from the pellets,” says R&D Manager Matteo Colloni. “In addition to that, a counterflow of hot air optimises both the tempera- ture homogeneity of the blend and the odour extraction.” In tests on PP pellets, the Bandera process produced superior results than a compet- ing process, in much less time: five hours versus eight hours, says Bandera. Starlinger’s customary setup is a RecoSTAR Dynamic recycling line with a C-VAC degassing
20 PLASTICS RECYCLING WORLD | October 2022
www.plasticsrecyclingworld.com
IMAGE: BANDERA
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