Through control of the residence time and the speed of the rotating elements, controlled polycondensation takes place whereby controlled IV boosting takes place of typically 0,02 to maximum 0,3 dl/g. The design of the Jump system avoids the ingress of oxygen so that the yellowing effect encountered during the recycling of PET is reduced to an absolute minimum.
After the PET melt has passed through a stilling chamber in the Jump system, the polymer is pumped directly into the production process (for example direct extrusion spinning, strapping) or to a pelletising (chip cutting) system. With the complete system consisting of the Gneuss Procecssing Unit with the MRS Extruder and a Jump system, industrial waste can be quickly and efficiently reprocessed in one processing step to a high quality polymer melt which can be directly processed to a finished product. The Jump system is available for different capacities of between 100 and 2.000 kg/h.
At the K, Gneuss will show an MRS 90i for a throughput rate of 400 kg/h, for industrial waste recycling with intermediate material buffer, auger and crammer/feeder. The extruder is coupled to the new Jump system, model V600.
Optimisation of polyamide processing with MRS technology
Nylon applications for the MRS-Extruder
Nylon fibre waste also occurs as bulky, contaminated industrial waste from fibre production and the MRS90i as exhibited by Gneuss is ideally suited for reprocessing this material. The MRS technology enables the efficient extraction of volatiles which disturb the process and/or properties of the material such as spin finish oils and can even be used to extract caprolactam (which can be recovered in a further processing step) from nylon.
Depending on the processing requirements, Gneuss offers special vacuum systems which operate at vacuum levels below 1 mbar.
The polyamide treated in this way can either be pelletised with a chip cutter or extruded direct to a final product such as carpet yarn (BCF), POY, film or other products. Direct processing offers major energy (cost) savings.
At the K, Gneuss will show their MRS 130 extruder for processing 900 kg/h of nylon or 1.000 kg/h of PET.
