Stackers are Bulk Material Handling equipment used mostly in the Cement Industry, Power Generation Industry (coal, gypsum, limestone) and Pulp and Paper Industry (woodchips), to stack Bulk Material on a Stockyard. Thanks to the Stacker System, the longitudinal piles can either be shaped in a chevron or in a cone shell mode.

UP traveling and luffing Stackers were designed to store Bulk products in longitudinal piles on one side or on both sides of a Stacking Yard Conveyor, which are parts of a Stacker machine used in power plants or in coal mines. Slewing Stackers are also possible, in order to create Circular Stockyards.