Extrusion International 1-2021

36 Extrusion International 1/2021 RECYCLING Several fi ltration systems require a production interruption when changing screens, cause process dis- turbances due to pressure spikes or even generate particles if deposited material comes off during screen changes. Disturbance-free production process thanks to permanently constant conditions In contrast, with the Gneuss Rotary Technology, the conditions in themelt fl ow are permanently constant, i.e. the pressure drop across the screen, respectively the amount of contami- nation on the screen, is kept constant, so that the line can always be oper- ated in the optimum range. This is achieved by the rotating move- ment of the fi lter disk, with which the screens are transported through the melt channel. A control system ensures that the screen contamina- tion remains constant. As soon as the contamination load varies, the con- trol system reacts automatically and changes the rotational speed of the fi lter disk. The pressure across the sys- • Automatic and safe operation with minimal operating effort • Application-speci fi c and rheologi- cally optimised melt channel for short melt residence times, melt channel design free from dead spots and fast product changes • Disturbance-free processing even of sensitive plastics • Consistently high quality of the end product • Simple and safe fi lter element re- placement • Ef fi cient cleaning of the fi lter ele- ments thanks to the fully automatic back- fl ushing Filtration System Type RSFgenius • Screens made of multi-layer stainless steel mesh, which allows fi nenesses down to 10 μ m in recycling applica- tions • For more than 35 years successful use in fi lm, sheet and fi ber produc- tion, compounding, PVC and other demanding applications Gneuss Kunststofftechnik GmbH Mönichhusen 42, 32549 Bad Oeynhausen, Germany www.gneuss.com If inhouse waste and heavily contaminated post-consumer waste are added to the production process, foreign particles of various sizes and quantities are introduced into the melt fl ow. These have to be fi ltered out ef fi ciently to ensure a consistent and high quality of the end product. At the same time, however, melt fi ltration must not have any disturbing in fl uence on the production process Reliable, Trouble-Free Melt Filtration as a Decisive Factor for the Economical Use of Reclaim in Plastics Processing tem thus remains constant. The only non-constant variable in the fi ltration process is the rotational speed of the fi lter disk. This makes the Rotary Technology the ideal solution for the increased use of reclaim or recycled material. Gneuss Melt Filtration Systems can be eas- ily integrated into an existing process and are perfectly suited as a retro fi t solution. The self-suf fi cient control system monitors the fi ltration process in conjunction with the production line. Advantages of Gneuss Filtration Systems for recycling applications The Gneuss Filtration Systems have been developed for demanding recy- cling applications and have been used successfully for decades. All fi lters from Gneuss work with the proven Rotary Technology, which offers the following advantages: • No interruption or disturbance of the production process caused by the fi lter operation • Pressure-constant production, free from pressure spikes