Lindner introduces shredders customized to produce RDF

The new Polaris 2200 and 2800 single-shaft shredders made by Austria-based Lindner Recyclingtech have been designed to perform single-step shredding of untreated household refuse as well as industrial and commercial waste. A typical application area will be the processing of refuse-derived fuel (RDF) to be used instead of fossil fuels at cement kilns (calciners) or in thermal power plants, says Linder.


Because the Polaris shredders run at a particularly low speed and with correspondingly high torque, their knives cut the input material with enormous power, as required by the single-step process, according to Lindner. Type 2200, with a feed opening of 4,090 millimetres by 3,000 millimetres (13.4 feet by 10.8 feet) and a rotor length of 2,115 millimetres (6.9 feet) shreds, for example, up to 22 tonnes of commercial and industrial waste per hour.


The Polaris 2800, with a feed opening of 4,779 millimetres by 2,370 millimetres (15.6 feet by 7.7 feet) and a rotor length of 2,805 millimetres (9.2 feet), achieves a volume of up to 32 tonnes per hour. Depending on the choice of screens, the final grain sizes are between 50 and 120 millimetres (2 and 4.7 inches).


Lindner says the single-shaft shredders have been designed to ensure constant output with uniform grain size, and that "every individual component of the system is noted for the robustness that is typical of Lindner products."


With the development of the Polaris single-shaft shredder, Lindner says it is supporting the trend toward the optimum processing of RDF to ensure it is coordinated to the scheduled application. Companies that process RDF for captive use thus have the possibility to make their production more cost-efficient while customers who process waste to offer it to a larger market as RDF can achieve higher margins, says the firm.


"When processing waste into RDF, high throughput and low shredding costs per ton are even more important than in other industrial processes," says Stefan Scheiflinger, a product manager at Lindner. "At the same time, the system must be able to shred untreated and in some cases bulky waste in a single process step to grain sizes of 80 mm and less. This makes particularly high demands on the design of the shredder deployed for this job. With the new Polaris, we comply precisely with these demands. It is proving in practice to be an energy-efficient system that functions reliably and, if necessary, is easily accessible for cleaning and maintenance work and thus enables consistently high productivity."


The market has welcomed the concept of shredding untreated waste in a single process step, says Scheiflinger, commenting, "Since we presented the new Polaris for the first time at IFAT in May 2016, we have sold an average of one machine a month. And, before the year is out, we will see a whole number of new orders."

Lindner says the Austrian waste disposal company KAB Kärntner Abfallbewirtschaftung was one of the first processors to gain practical experience with the new Polaris. "Our company wanted to take advantage of the economic advantages of the single-step shredding technology," says the firm's managing director Werner Bleiberger. "In the search for a modern, high-performance system, our attention was drawn to Lindner. They loaned us a first prototype of the Polaris to test for around a year. Over this period, the system proved its efficiency, reliability, low maintenance and maintenance friendliness very impressively indeed. Lindner's uncompromising commitment to maximum quality and the shredder's successful implementation in practice were convincing arguments for us."


A video clip of a Lindner Polaris model at work can be viewed here.


Austria-based Lindner manufactures machines and plant components that are exported to nearly 100 countries around the world, including stationary and mobile crushing and shredding machines for recycling and waste processing. Lindner America, based in Raleigh, North Carolina, is Lindner's North American subsidiary.

» Publication Date: 28/11/2016

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This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement N° 690103