ODOUR | ADDITIVES


into the extrusion line. However, because of its low melting point of 88˚C, care should be taken to prevent feeder overheating. Direct use of the 100% active form in single-screw film lines is not recom- mended, as it may lead to inhomogeneous distribution and processing issues. For such cases, Evonik offers PE or PP-based masterbatches containing Tego Sorb PY 88. The recommended dosage ranges of the additive fall between 0.5% to 2.0%. The company says that Tego Sorb PY 88 TQ complies with various regulations, including European Regulation 10/2011 and FDA guidelines, making it suitable for applications involving food contact. US-based additives manufacturer Avient


introduced a new antimicrobial additive in Febru- ary. Cesa WithStand SX Low Haze is an antimicro- bial additive for clear polycarbonate and PMMA applications. The company says its patent-pending formula is especially useful for products incorporat- ing recycled resin. It helps to preserve visual clarity and aesthetics in finished plastic parts while protecting against bacterial, mould, and fungal growth. By limiting microbial growth, these additives reduce unwanted odour, staining, and discolouration, allowing plastic parts to maintain a “like new” appearance for an extended period.


Stripping agent Aimplas, the Spain-based research group, has investigated supercritical CO2 as a stripping agent to address odour challenges in compounding, noting its use in other industries for aroma extraction or caffeine removal. In its supercritical state (above 31.1˚C and 73.8 bar), CO2 combines gas-like diffusivity with liquid-like solvating power, allowing it to deeply penetrate the polymer matrix and selectively extract low molecular weight species such as VOCs and odorants. The main challenge is to achieve supercritical conditions inside a twin-screw compounding extruder. Aimplas said that in its research work, it has achieved pressure over 100 bar.


CLICK ON THE LINKS FOR MORE INFORMATION: � https://zeochem.com � www.struktol.com � www.kisuma.com. � www.aqdot.com � www.caiadditives.com � www.evonik.com � www.avient.com � www.aimplas.net � www.zeppelin-systems.com � www.kreyenborg.com


www.plasticsrecyclingworld.com October 2025 | PLASTICS RECYCLING WORLD 53


Deodorising units for recycling lines


Processing technology companies have been active in developing odour-reduction solutions in PCR plastics. As well as recycling machinery companies (such as Starlinger, Erema, Gneuss and others) auxiliary equipment companies Zeppelin Systems and Kreyenborg are also working in this field. Zeppelin demonstrated a laboratory system for deodorisation at the PRSE exhibition in Amsterdam in April. Central to its approach is the Fresh-Tec thermal-physical cleaning process, which degasses recycled plastics to remove unpleasant odours and organic contaminants. By integrating energy recuperation from process waste heat, the company says its deodorisation systems deliver both performance and energy efficiency. For testing and development, the company provides the DEO-L mobile laboratory deodorisation unit, allowing users to simulate heating, degassing, and cooling at lab scale. Parameters such as temperature (up to 120° C), air flow and retention time are fully adjustable. These trials generate reliable data that can be scaled up directly to industrial systems. At K2025, Kreyenborg will show a large product family based


on its infrared rotary drum (IRD) technology. The technology is well established for PET and rPET drying applications where IRD achieves drying and crystallization in one step and Kreyenborg has also developed the IR-Clean decontamination system for rPET flakes. It said its new IR-Fresh system extends its technical know- how to deodorising PP and PE recyclates. The system can be placed before or after the extrusion process. Kreyenborg has entered a partnership on further development of odour control solutions with recycling technology group NGR.


Fresh-Tec deodorisation unit from Zeppelin Systems


IMAGE: ZEPPELIN


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56