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    Live From Shows

    Gneuss to Discuss Recycling Technology

    Technology enables the processing of high-volume, industrial PET waste

    Gneuss to Discuss Recycling Technology
    06.18.19
    At this year’s ITMA, Gneuss (hall 5.1, booth J36) will highlight its innovative PET recycling process for the use of industrial and post-consumer waste in direct spinning.

    The Gneuss Recycling Technology enables the pro¬cessing of high-volume, industrial PET waste from fiber, nonwoven or film production, and from contaminated post-consumer bottle flakes. The recycling technology is based on the Gneuss Processing Unit (GPU) with MRS extruder, rotary filtration system and online viscome¬ter with intelligent viscosity monitoring and control, optional combined with Gneuss’ JUMP reactor.

    The first important processing stage, melt decontamination, takes place in the GPU. With its excellent devolatilization capacity, the MRS extruder can process PET waste with high residual moisture levels and/or contamination (such as spin finish oils) without the need for any pre-treatment of the waste. In the Multi Rotation Drum, multiple satellite screws produce a large melt surface and surface exchange rate, so that an optimum devolatilization and decontamination result can be achieved with conventional water ring vacuum pumps. All volatile impurities such as water and / or spinning oils are safely removed eliminating disturbances in the spinning process.

    Solid impurities are subsequently filtered out by the melt filter. Rotary Filtration Systems operate continuously, process constant and automatically, and guarantee a particle-free melt thanks to finest filter elements with filter fineness down to below 20 µm.

    With the Online Viscometer VIS, the melt viscosity is measured in real time and directly adjusted. Depending on the recycling process, the viscosity is specifically reduced by means of ethylene glycol injection or in a further step specifically increased in the IV boost system JUMP.

    Subsequently, the polymer melt is merged with the main, virgin polymer melt flow either upstream or downstream of the finisher.

    With this recycling technology, combining an MRS extruder with the optional JUMP reactor, industrial and post-consumer waste can be turned into a high-quality and directly usable melt in a very short time. Thanks to the enormous line flexibility, different PET qualities can be produced.

    This recycling concept, which received an award for innovative performance last year, has convinced one of China's largest fiber producers. The recycling concept for processing fiber waste into pellets will be implemented by the Chinese manufacturer before the end of this year. Then an MRS130 will process up to 900 kg/h of fiber waste (staple fiber and POY) into melt. All the spin finish oil and water and other volatiles will be taken out in the high efficient degassing section. There is a possibility for injecting additives into the MRS as well, so there is an optional adding of color (TiO2, carbon black …) as well as of other reactive additives. After the devolatilization in the MRS all solid particles will be filtered out by a RSFgenius175 equipped with 20 micron screens. The purified melt will be fed via a startup valve into the reactor for the IV lift. Alternatively, in this line set-up, there is an option to feed the melt directly (before the reactor) to a pelletizer to produce pellets with a lower IV. 
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