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Technology/Machinery

Gneuss to present technological innovations at ITMA 2015

The company will display the latest product developments in processing, filtration in measuring technologies.

10th July 2015

Innovation in Textiles
 |  Bad Oeynhausen

Industrial

Gneuss, a supplier of innovative solutions for the plastics processing industry, will exhibit its technological advancements at the upcoming ITMA 2015, the leading international exhibition for textile machinery that is set to take place in Milan this November.

The company will display its MRS extruder, a technology for processing of engineering polymers without pre-drying, efficient Process Constant Melt Filtration Systems for fast colour changes and und high throughput rates, and an Online Viscometer, VIS, for measuring viscosity in real time.

Processing technology

Although originally developed specifically for PET, the MRS extruder is now also running in polyolefin and nylon applications, and testing with other materials promises many more applications in the future, the company reports. Even fibre coated with spin oils and other contaminants and with high residual moisture level can be fed directly into the extruder without any pre-treatment.

More than 50 MRS extruders of all sizes, from the MRS 35 for 35 kg/h to the MRS 200 for 2000 kg/h, are now successfully in operation worldwide. The extremely high devolatilizing and decontamination performance of this technology has been especially convincing, according to the manufacturer.

The MRS extruder is designed to allow the processing of PET without pre-drying by using a simple water ring vacuum system to process the material directly to high quality end products. This is achieved by means of its unique and patented processing section. Based on a conventional single screw extruder, the Multi Rotation Section is a drum containing eight satellite single screws, driven by a ring gear and pinion transmission. The barrels cut into the drum are approximately 30 % open and provide optimum exposure of the melt.

Filtration technology

With today`s economic pressures, the efficiency of a polymer melt filtration system plays an ever more important role. The company presents Process Constant Melt Filtration Systems from Gneuss, in particular, the RSFgenius and SFXmagnus featuring the self-cleaning back flushing system and offering economic efficiency.

Acoridng to the manufacturer, the number of RSFgenius and SFXmagnus systems sold in big sizes has doubled in the last years, as there is a noticeable trend for bigger lines and therefore bigger filtration systems worldwide.

Rotary Melt Filter RSFgenius M. © Gneuss

The new RSFgenius M model is said to cope with even higher contamination rates thanks to the synchronization of the drive and back-flushing mechanism. This further optimizes the unique self-cleaning technology resulting in a significant increase of screen capacity, as well as a reduction of the quantity of material lost through backflushing, the company reports.

Measurement technology

On a MRS extrusion line, the melt viscosity can be measured in real time with the Online Viscometer, VIS. Using a precision spinning pump, a small polymer flow is pumped in bypass through a precision capillary. Both the melt temperature and the melt pressure are measured (at two points) and using internal calculation software, the system works out the representative shear rate and viscosity.

When processing recycled PET with a varying residual moisture level and input quality, based on this melt viscosity measurement, it is possible to maintain the melt viscosity within a narrow tolerance band by changing the vacuum at the devolatilising section of the MRS extruder, the company reports.

Online Viscometer VIS. © Gneuss

With a control loop from the online viscometer VIS to the vacuum pump(s), the melt viscosity and therefore the IV of the end product can be maintained at the required level. While other manufacturers also offer online viscosity measurements, Gneuss’ MRS extrusion technology is said to both measure and actively control the end product IV.

www.gneuss.com

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