The material to be shredded is fed into a connecting channel, the same width as that of the main shredder. The infeed of the material is then supported by infeed rollers which lead the material to the rotors. This input process works according to the weight of the material so that if the rotors require too much electricity during the shredding process, the operation is automatically switched off until the full shredding process of the material which is already partly shredded has been completed. This process repeats itself constantly until all parts are shredded.