INNOVATION | ODOUR REDUCTION
NOVE:E GAM I
where the Refresher unit comes in for the final touches in odour removal. The company highlights the benefits of its technology in the use of PCR HDPE in odour-sensi- tive areas like personal care and food-contact packaging. “In May 2019 the world´s first 100% percent recycled plastic packaging for a body care product made its way onto the shelves. The Erema technologies Intarema TVEplus RegrindPro and the ReFresher module, which ensure the required high regrind quality, including the necessary odour optimisation, play a major role in this success.” In autumn 2019, Erema
received confirmation from the FDA in the US that HDPE pro- duced using up to 100% PCR with the Intarema TVEplus Regrind- Pro extrusion system in combi- nation with the ReFresher module is suitable for use in food packaging. The starting material is a defined input consisting of 99% food-contact compliant HDPE, such as milk and juice bottles. The PCR HDPE can then be reprocessed into
bottles, but also into food cups and disposable dishes and cutlery. Producers of additives and
masterbatch have also been busy developing solutions to the odour problem.
Above: Evonik says its Tego Sorb additives and masterbatches lock in smalls by binding odour-causing molecules
Evonik’s Tego Sorb products are designed to address odours from degradation and contami- nants in recycled plastics. They are available in 100% additive pellet form and as polyethylene and polypropylene masterbatches. Alexandra Sloan Fersner, Regional Segment
Manager, Polymer Specialties, says: “With our Tego Sorb additive, Evonik has developed a material that counteracts odours even in low concentra- tions. Rather than covering up or masking odours with a scent, Tego Sorb works in accordance with the lock and key principle by irreversibly binding odour-causing molecules. Working in this manner, odour molecules are trapped in the material and therefore are not able to be sensed.” She continues: “The material works best for
nitrogen- or sulphur-based odour molecules. In many formulations, the addition of a minimal amount of Tego Sorb to the total mass is usually enough to achieve permanent improvement. This enables use of a higher percentage of recycled materials, making products even more sustainable. Our 100% active product, Tego Sorb PY 88 TQ, is
36 PLASTICS RECYCLING WORLD | May/June 2020
best incorporated using twin screw extrusion. In instances where this is not feasible, we also now have Tego Sorb PY 50 PP/PE which are PP and PE masterbatches of the active material for better incorporation when using single screw equipment.” Struktol offers additives which specifically target odour and VOC control, such as its RP 17 and RP 53 products (Plastics Recycling World May-June 2019). At K2019, the company launched its VMO line of products for modifying the melt flow index (MFI) of PP, which also has an odour control benefit. “These products are unique in that they include an odour neutraliser which will greatly reduce odour in the final compound,” says the company. Each VMO product is in a Struktol lubricant/
process aid making a pellet masterbatch form that can be easily incorporated into the polymer or compound. The company says VMO products can be used with PP-PE blends and still allow for MFI increase, helping companies recycling PP with PE contamination. The VMO series products have been designed to allow for PE presence, in some cases upwards of 35%. Struktol says: “This VMO series can be very useful for manufacturers that want to reduce the amount of virgin or recycled PP of differing MFIs they keep on hand. Having one type of PP resin of low MFI would allow for any number of higher MFI possibilities.” Ampacet has introduced Odor Scavenger 1000258-E, which it says is “a powerful wide spectrum odour-absorbing masterbatch designed for use with recycled PE to neutralise odours of post-consumer recycled material and keep them enclosed inside the polymer. “ The product has been formulated for use in injection and blow moulding, film and some extruded applications, such as geomembranes. The company suggests end product uses include bottles, trash bags and tubes and pipes. Odor Scavenger 1000258-E does not significantly affect the production process or physical properties of polymers, it says.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.ivv.fraunhofer.de �
www.ua.es �
www.aimplas.net �
www.luigibandera.com �
www.coperion.com �
www.starlinger.com �
www.erema.com �
https://corporate.evonik.com �
www.4struktol.com �
www.ampacet.com
www.plasticsrecyclingworld.com
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