The residues introduced vertically into the Bag Opener, by conveyor belt, fall on their rotor which has a set of helically arranged high strength claws. When the rotor is rotated, the bags are opened between the fixed counter claws on the equipment frame (stator) and the rotor claws.
The residues extracted from the bags exit through the lower hopper and are transported by carpet to the next step of the mechanical treatment. In the event of an overload on the rotor, its original working movement is reversed during a predefined period of time. The rotor then rotates again in the working direction, but in case the overload persistes, an alarm is triggered and the operation is interrupted in order to allow extraction of the improper parts.