Apparatus for processing fibrous pulp material

The invention relates to an apparatus (1) for processing a flow of pulp comprising fibrous material, in particular pulp comprising cellulose fibres for making paper, said apparatus comprising a drum (2) having a rotational axis (R), an inlet end (3), an outlet end (4) and an inner surface, a plurality of rolls (11) arranged in said drum with their rotational shafts substantially parallel to said rotational axis of said drum and defining nips between a surface of said rolls and said inner surface of said drum, driving means from revolving said drum and said rotational shafts of said rolls with respect to one another, an inlet (6) for introducing pulp adjacent to said inner surface of said drum at said inlet end of said drum, an outlet (7) for removing processed pulp adjacent to said inner surface of said drum at said outlet end of said drum, and an adjustment device for setting the width of said nips.