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48-49 material does not indicate a reference value for the sorting of a single fraction, while the maximum number of movements for a given material can do so. After analysing the results for this parameter, it has been found that all selected fractions can be assigned the same reference activity level (2,000 movements/operator and hour). • Mean performance per operator (kg/operator and hour) The mean of the values obtained has been calculated by dividing them into the total kg selected manually and the operators engaged in segregating them, and by the effective sorting hour (Table 5). Due to the variety in the quality of the input material, no reference value is provided for the bulky materials sorting stations. Performance by secondary sorting operator. Table 5 Reference value kg/operator*h 79 The values found using an atypical value determination analysis have been eliminated. The remaining values have been used to calculate the mean value for each manually selected material. In automated sorting plants where manual sorting of materials of the light flat fraction is performed, the parameter measured in manual sorting plants are applied (Table 6). It should be noted that steel and aluminium materials are not subjected to manual sorting, as the machinery that segregates these materials is installed in both manual and automated plants. Performance by secondary sorting operator for each material. Table 6 PET HDPE NATURAL HDPE COLOUR HDPE FILM MP CB P/C kg/operator and hour 90 122 192 126 58 54 78 306 Sorting line availability This is the percentage of effective operation hours of the line with respect to the plant working hours: Line availability (%) = h actual line operation h shift - h stops x 100 A line availability under 85% for a plant is considered to be a very low value. To calculate a reference value, the data on plants which on the day of the study obtained a value under 85% have been eliminated. After analysing the results of the data obtained, it is determined that for both manual and automated plants the line availability must be greater than 95% of the time employed, since values lower than this lead to a reduction in the annual capacity of the facility. LIGHT WEIGHT PACKAGING SORTING PLANTS


Libroplantasingl
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