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Tumbler screening technique
Tumbler screening is a separation method that uses three-dimensional elliptical movement to separate very fine particles from larger ones. It is an important technique applied in many fields dealing with raw materials and building materials for process and reuse.〔The experts for separation process, Screening technique June 2004〕 This technique can achieve 99% high efficiency with its circular movement.〔 Machines with tumbler screening techniques are commonly used because of its unique rush design, high life time utility, and the flexible angular velocity the machines can achieve.〔PM Update. PM Update, MPR October 1994〕 However, this type of machine requires low feed flow rate and the particles size for separation have to be controlled within a specific range.〔Hashem Alkhaldi, Peter Eberhard, H.A.P., (Particle screening phenomena in an oblique multi-level tumbling reservoir: a numerical study using discrete element simulation ), PDF, 30 May 2007, pp. 415 - 429〕 Furthermore, the performance of the process also depends on the intensity of the vibration.〔Hosokawa tumbler increases screening rates, Metal Powder Report 1994, vol49, p.3〕 On the other hand, the water steam treatment is also an issue of this screening technique since this technique is applied worldwide. Presently, the most effective and environment friendly way for processing of the waste treatment is to classify the products. The products are usually split into four categories, including organic, inorganic, hazardous and recyclable.〔Bilitewski B .2005, Thermal treatment of waste – State of the art. In: Sardinia 2005 Tenth International Waste Management and Landfill Symposium, Editors Raffaello Cossu, Rainer Stegmann〕 Nowadays, scientists are also research for the new development of the techniques; enhance the function of the machines in order to provide the technique into much more field and yields better product.
== Overview ==
The tumbler screening technique is a separation method that applies an elliptical movement in three dimensions, which helps to efficiently produce very fine materials. It can be considered an improvement to the vibration and linear screeners.〔 The basic principle for the machines with tumbler screening technique is that the fine particles stay on the center of the screen desk while larger particles move towards to the edges. Furthermore, by adding more desks and cleaning desk to the machine, it can obtain even more high-quality separations.〔Tumbler screening, Pharmaceutical technology Asia Pacific 2001, p.34〕
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