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Automatic storage systems that handle load units weighing less than 250 kg are defined automatic storage systems for light loads. These systems usually handle boxes, containers or trays made of plastic or metal. When the weights of the materials handled are less than 50 kg the systems are called mini-load systems. The storage systems for light loads are characterised by a high level of performance. They are typically medium-sized storage systems with high capacity (tens of thousands of boxes), provided with very fast stacker cranes; translation can vary from 4 to 6 m/s, while the lifting speed is between 1 and 2 m/s. The high performance is obtained in particular by accelerations on the translation axis; to achieve this performance, at the same time guaranteeing duration and dependability, the stacker cranes are provided with wheels fitted with special polymer tyres. Another typical characteristic of the automatic storage systems for light loads is the large variety of load unit gripping elements: in addition to the normal telescopic fork, solutions with sliding systems, with grippers, suction pads etc. can be provided. In the majority of cases these systems are contained inside the buildings, but they can also be provided inside self-supporting structures.

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