Abstract: An apparatus for disintegrating or beating stalk-, stem- and/or sheet-type regenerative raw material that includes a stator and a rotor is provided. The stator is configured as a sieve drum on whose inner wall radially inwardly-directed, teeth-like projections are provided as disintegration tools. The rotor has a rotor hub and a plurality of radially outwardly-directed arms mounted on the rotor hub, a plurality of axially-directed support bars mounted to the ends of the arms, and a plurality of radially outwardly-directed disintegration tools mounted on the support bars.