TECHNOLOGY | MELT FILTRATION
removed effectively from the starting material by means of automatically regulated high-perfor- mance vacuum, ranging from 1 to 30 mbar. Gneuss Filtration Technology introduced an additional filter size across its line of Rotary Filtration systems to ensure an optimised and cost-efficient filtration solution for a wider range of applications. Its new size 110 filter is available for its RSFgenius, SFXmagnus, SFneos and CSFprimus filtration technology. The new size 110 offers almost 20% more active screen area than the size 90 for each model, 46 to 62 in2
depending on the
Above: Gneuss SFXmagnus filtration system
recycling system, is available as a separate but easy-to-integrate upgrade component for existing systems. The Visco+ can be a solution for IV homogenisa-
tion from an existing production system that incurs IV fluctuations. The special filter technology can actively intervene and balance out any irregularities, says BB Engineering. The vacuum filter can also be a solution in a process where the final viscosity of the material is insufficient. It can increase the IV without negatively impacting material residence times.
IV control
BB Engineering says its unique, patented process allows for fast and flexibly controllable viscosity build-up and reliable viscosity monitoring of the polyester melt. Depending on the intended end use, the melt can be adjusted to achieve the requisite melt properties including IV, purity and homogeneity, which can be adjusted while processing is ongoing.
BB Engineering says the completely new and
super-efficient Visco+ unit operates like a liquid- state polycondensation unit. Moisture is removed from the PET, which in conjunction with an adjust- able residence time, increases the IV to the desired level while in the vacuum. This approach, which does not require a maintenance-intensive reactor or a deposit-prone stirring unit, enables a con- trolled IV build-up of up to 30%, the company says. The IV is continuously monitored by means of an
integrated viscosity measurement unit and reliably adjusted in the event of deviation, such as those caused by disparate input qualities, for example. At the same time, the Visco+ provides an enormous material surface compared to the volume and is continuously renewed. Contamination can be
50 PLASTICS RECYCLING WORLD | March/April 2023
specific model. A larger size 150 has been available with each filtering technology series that has an active screen area that is more than 50% larger than the size 90. Gneuss says its Rotary Filtration systems operate continuously and automatically and are process ad pressure constant. They are characterised by a filter disk on which the screen cavities are in a ring pattern. Screens can be changed on the part of the filter disk that is not actively in the melt channel, while the production process continues operating. Gneuss says its ninth SFXmagnus rotary filtration system was recently commissioned by MP3, an Italy-based extruded sheet specialist that adds the melt filtration technology to its lines to make product with higher percentages of regrind material. MP3 produces ABS, ABS/PMMA and PS sheet for the furniture and building industry, and makes thermoformed technical parts for vehicles and sanitization markets. Five years ago, MP3 replaced three of its existing screen changers with three SFXmagnus rotary filtration systems from Gneuss on a sheet line comprised of a main extruder and two co-extruders. The line processed PS, ABS and PMMA, with up to three colour changes occurring daily. With the installation of the SFXmagnus systems MP3 can add up to 50% regrind without any process disturbances or quality issues even with the high contamination load. MP3 retrofitted to another line with three SFXmagnus units in 2020. Another line was also retrofitted with three SFX- magnus units early in 2022.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.fimic.it �
www.plasticsrecyclers.eu �
www.maag.com �
www.witte-pumps.com �
www.nordson.com �
www.erema.com �
www.britas.de �
www.bbeng.de �
www.gneuss.com
www.plasticsrecyclingworld.com
IMAGE: GNEUSS
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