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."