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Polaris 2800 stationary waste wood shredder proving to be the right machine for Wurzer Umwelt

Germany-based recycler achieving low fines output and high throughput

F.l.t.r. Wurzer Umwelt Managing Director Wolfgang Wurzer, Lindner Sales Director Gerd Tischner, Wurzer Umwelt Signing Officer and Operations Manager Hans Kenst, Lindner Sales Representative Rudolf Schwager
F.l.t.r. Wurzer Umwelt Managing Director Wolfgang Wurzer, Lindner Sales Director Gerd Tischner, Wurzer Umwelt Signing Officer and Operations Manager Hans Kenst, Lindner Sales Representative Rudolf Schwager

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152 Walker Road
Statesville, NC
US, 28625

Website:
l-rt.com

Phone number:
+1.800.235.1391

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The Wurzer Group, based in Eitting near Munich, Germany, has been relying on Lindner shredding technology for over ten years. For the past year, the company has been successfully using the manufacturer's new Polaris 2800 for processing waste wood. The result, according to the company: few fines in the output and the highest throughput, with optimal machine availability, based on consistent, reliable and safe operation.

Wood has always played an important role in the economic life of the Upper Bavarian community of Eitting near Munich. The over one-thousand-year-old history of the town also includes the historical timber rafting and log driving on the Isar River in its early days. Today Wurzer Umwelt GmbH is part of Eittinger's timber industry tradition, in which the processing of waste wood (grades A1 to A4*) is one of the manifold business activities of waste management and recycling. 

"Wurzer successfully entered this segment 25 years ago," explains Hans Kenst, Signing Officer and Operations Manager, and part of the company since 1997. 

"We have been continuously expanding our processing capacities, including the construction of a large hall for the dry storage of A4 wood. In the last three or four years, the total quantity of waste wood processed has increased from around 30,000 to around 100,000 metric tons per year." 

Kenst sees further potential for development in this dynamically growing market. Most of the material comes from demolition and restoration activities and is brought to their site by commercial C&D waste collectors.

Quality that pays
To cope with higher waste wood quantities, Wurzer's processing line was updated in May, 2018 with an older machine from another supplier being replaced by the Polaris 2800. 

After a year, Wurzer Umwelt's experience has shown that the Lindner shredder is the ideal machine for maximum throughput with low fine particle content in the output, to satisfy buyers' quality requirements. Compared to similar single-shaft shredders on the market, the Polaris machine series has the lowest production costs per metric ton of finished material (€/t) - as proven by a study from the Austrian University of Leoben and confirmed by its users. 

Made for continuous operation
Hans Kenst is also pleased with the Polaris shredder's electric drive energy efficiency. From an engineering perspective, he says he is particularly impressed by the enormous force that the Polaris exerts with its countershaft drive, and by the shredder's signature resistance to non-shreddables.

Kenst recalls long downtimes previously: "The predecessor was more susceptible to foreign objects and sometimes non-shreddables in the feed caused repair work that meant it was down for two whole days."

With the Polaris from Lindner, he says this problem has been solved. The roughly pre-crushed input material may still contain screws, nails, hinges and other metal parts which the upstream over-belt magnet has not picked up and removed from the material flow. But, Kenst says the Lindner shredder is not bothered by these non-shreddables. He also appreciates the Polaris' ‘good behaviour': "The safety clutch prevents machine damage even from large chunks of rock and massive metal parts which the over-belt magnet has not detected and removed. It comes to a standstill immediately, the non-shreddables are quickly removed via the hydraulic maintenance door and the machine is back up and running in no time."

The Lindner Polaris 2800 shredder is designed for continuous operation.

Nothing goes to waste
Fine fractions were also previously an issue for Wurzer Umwelt, which is why the company says they opted for Lindner. The Polaris 2800 shredder produces significantly fewer super fine particles than their previous shredder. 

"Output destined for combustion with a high fines content is not readily accepted by users and you simply can't sell it like that," explains Hans Kenst, adding that the Polaris's approach of cutting the material with a relatively lower speed of 112 rpm instead of crushing it with a speed of between 800 and 1000 rpm has clearly proven to be a success. 

At their facility, the waste wood is roughly pre-crushed to a size of < 300 mm and further processed in the Polaris. With a throughput of approximately 45 metric tons per hour, the machine shreds the material to an output size of < 80 mm. This way the product meets the highest quality standards and can be recovered for both energy and material use in the wood panel industry. 

‘Every machine is only as good as its service'
The Wurzer waste wood processing facility operates nine hours a day, and Kenst draws a very positive balance for their company after one year of having the Polaris in operation.

"Lindner-Recyclingtech has been a reliable partner of ours for over ten years now," he says. "In view of the increasing quantities of processed waste wood, it was the right decision to change to Lindner in this area of the business, too. The Polaris 2800 is the ideal shredder for stationary waste wood processing. Overall, we are extremely happy with the manufacturer's machines and services. The whole package is perfect."

And if something goes wrong? "No worries, we have a competent contact at Lindner," he adds. "The sales representative will take care of everything immediately. Things can happen, but it's important that you get a quick response.

"Every machine is only as good as its service. Which is something we really appreciate at Lindner!"

* Waste wood grades: 

A1: virgin or only mechanically treated waste wood
A2: glued, colour-coated or painted waste wood
A3: waste wood with organohalogen compounds
A4: waste wood treated with wood preservatives e.g. railway sleepers, utility poles, hop poles or wine stakes (source: Wikipedia)

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