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GLOSSARY OF EQUIPMENT 116-117 Optical separator capacity depending on the useful belt width. Table 13 Useful belt width (mm) Treatment capacity (t/h) 500-900 1.0 – 2.0 1,000-1,200 2.0 – 3.5 1,400-1,600 3.5 – 4.5 2,000-2,400 4.5 – 7.0 2,800 7.0 – 9.0 Keep in mind that these values can vary according to the manufacturer, the reading technology, the point of the process in which the unit is located, the quality and density of the material and the fraction to be selected. • Length of the acceleration belt. This parameter depends on the speed of the acceleration belt, which must be adjustable between 2.2-3.7 m/s, in order to distribute the material along the belt and reach speeds that aid its launching. As a rule, the acceleration belt should have a length greater than 5m in case of longitudinal feeding or 6m in case of transverse feeding. These lengths must be observed when designing and installing the unit in the line, as lengths shorter than recommended can result in the material not being stable on the belt at the moment when it passes by the reading scanner, leading to reading and sorting errors. • Number of valve blocks. Optical separation units can have one or two blocks of air valves. Optical separators with a single block separate two fractions, the requested fraction and the rejected waste. Optical separators with two blocks separate the stream into three fractions, two requested fractions and one rejected waste fraction. The latter have the advantage of requiring less installation space and lower investment costs as a single optical separator allows the sorting of three fractions. The number and type of air valves for each block depends on each model. The more valves per centimetre, the greater the precision of the optical separator. • Quality of the recovered material. Since the purity of the selected fraction is not 100%, after the optical separation a quality control must be performed on the material. The quality control is normally performed by manual sorting operators who segregate the materials on a conveyor belt that do not belong to the requested fraction (impurity selection LIGHT WEIGHT PACKAGING SORTING PLANTS


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