Pulp Paper & Logistics


ANDRITZ 19


The pure steel fraction separated


stage process is recommended. In the first part of the plant, the rags are fed to a coarse shredder. The slow-running, twin-shaft device is ideally suited for powerful and, at the same time, energy-saving pre-shredding of the stringy input material. It is largely insensitive to possible contaminants. The Andritz UC Universal


Rotary Shear allows very flexible operation for rags of all lengths and diameters at high throughput rates of up to 15 tons per hour. In


order to avoid any quality issues in the substitute fuel fraction and other subsequent and more sophisticated separation technologies, manual sorting can be applied after the first stage so that contaminants from the process can be removed at an early stage. For reliable post-shredding of the pre-shredded pulper rags, the Andritz UG Universal Granulator is the best choice. The material fed to it is grabbed by the fast-running


This residual fraction of mostly plastics can be used as substitute fuel


rotor and shredded in interaction with the fixed stator knives. An exchangeable screen below the rotor with variable perforation diameters has considerable influence on the throughput and the shredding result. For efficient removal of metal


wires with high cleanliness in the metal fraction, it is important to cut the pre-shredded rags to a size of below 40mm and to loosen up the material. This task is performed perfectly by the


Andritz Granulator. All machines are equipped with a specially- controlled hydraulic pusher that reacts quickly to changes in the incoming material. This ensures highest operational


safety and maximum throughput. Normally, an overband magnet is used to remove ferrous steel wires. If a further reduction of the non-ferrous metal content is requested in the substitute fuel fraction, the concept can be extended to include other suitable separation technologies. Although the properties of the pulper rags as feed material are subject to considerable fluctuation in terms of material composition, dimensions, and moisture content, Andritz’s two-stage process is said to achieve very good results and produces high-quality fractions. The steel fraction, which originates mainly from the binding wires round the waste paper bales, is uncontaminated and can be marketed easily as a valuable fraction, for example as scrap used in foundries. The remaining fraction with its high calorific value is normally used as substitute fuel. More information from ANDRITZ


Pulper rags can have a length of up to 15m


AG, Graz, Austria. Tel: 43 316 6902-0. Email: fiber.prep@ andritz.com


July/August 2017


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