Automatic big bag unhooking Automatic big bag unhooking The automatic unhooking of the big bag is composed of 4 hooks able to open once the filling of the big bag is finished. This system works by means of pneumatic cylinders located at each hook. At the end of filling, the big bag is automatically unhooked without the operator having to intervene. The extension table is then repositioned in its initial position. The hooks have a unit load capacity estimated at 625 kg and their working pressure is 6 bars.