RECYCLING AND RECOMPOUNDING | TECHNOLOGY
Below: Gneuss Omniboost line increases intrinsic viscosity of rPET
extends the full length of the satellite screws, is completely under vacuum. The high rate of action by the satellite screws brings about a high surface area exchange rate of the polymer, resulting in far greater devolatisation than with other extrusion systems, the company said. The MRSjump model has a longer, modified Multi Rotation Section to ensure a longer material residence time and more material surface area exchange under vacuum. The 1 mbar of vacuum and the high surface exchange rate can be used to boost the viscosity of the rPET and hold it at a stable level even if there are variations in the input material. The ability of the system to boost or hold the intrinsic viscosity of the rPET allow it to be used to directly recycle PET film waste or fibre reclaim in one extrusion step, which was previously impossi- ble due to the low intrinsic viscosity or variable input viscosities of the rPET material. The RSF Genius rotary filtration technology and online viscometer VIS melt viscosity measurement device ensures the high quality of the melt. During the K show Gneuss will operate two
different Omni systems running different PET operations at its technical centre located at its headquarters. A complete PET sheet extrusion line featuring an Omnimax recycling machine, MRSjump 70 extrusion system with deep vacuum, a RSFgenius 75 fully automatic filtration system and a 500mm wide extrusion die will be in operation. An Omni- boost recycling machine with Jump polyreactor technology and an extrusion and filtration system will also be in operation at the technical centre where it will increase the intrinsic viscosity value of the PET melt. The system regulates the residence time of the material under vacuum in the reactor as well as the fill level and the rotation speed of the agitating devices to achieve the desired product properties. The system can introduce the condi- tioned polymer directly into the production process without the need to remelt the PET. Farrel-Pomini is introducing at K2022 a new High-Dispersion (HD) single-stage rotor with an
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enhanced mixing area in a 10:1 L/D format for use in its Compact Processors line of compounders with a hot feed extruder on a unitised frame. The HD rotor is specifically designed for applications requiring high dispersion, such as fibre grades, high colour carbon black and colour concentrates. The mixing section of the HD rotor is double the
length of Farrel Pomini’s standard rotor. Several new technology designs are incorporated into the new component, including a new concave feed flight design which increases the conveying efficiency at the infeed of the mixer. High rotor speeds aid the intake of lower bulk density materials. The feed screw also has a partial double feed flight design with increasing pitch that maximises the throughput rate and allows for even distribu- tion of material over both rotor tips. A new double length mixing section uses rotor cooling to increase the residence time of the material, resulting in higher material viscosity that increases energy input to maximise dispersive mixing, the company said. The HD rotor also incorporates a wider apex region that increases the material exchange between both rotors for better material distribution and increased homogeneity of the compound. The HD rotor also features newly designed offset blister rings on each rotor with an adjustable dam that is used to throttle material from the mixing section, allowing for the adjustment of material residence time. A pumping section located downstream of the blister ring improves venting performance by moving material out of the mixer through the orifice.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.erema-group.com �
https://plasticpreneur.com �
www.coperion.com �
www.gneuss.com �
www.farrel-pomini.com �
www.kraussmaffei.com
October 2022 | PLASTICS RECYCLING WORLD 45
IMAGE: GNEUSS
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