Beating apparatus for fiber suspensions

A beating apparatus for fiber suspensions including:

• a housing having inlet means for suspension and outlet means for beaten suspension, said inlet means communicating with an inlet compartment of said housing and said inlet means communicating with an outlet compartment of said housing;
• a rotatable drum arranged in said housing and having an envelope wall and at one axial end an end wall, said drum being open at its axial end opposed to said end wall, perforations extending between an inner and an outer surface of said envelope wall, one of said surfaces providing a first beating surface;
• a plurality of stators circumferentially spaced about said envelope wall in said housing, each of said stators carrying a stator shoe having perforations extending between first and second opposed surfaces thereof, one of said opposed surfaces providing a second beating surface located close to said first beating surface;
• and
• shield and guide means arranged between said inlet and said outlet to allow flow from said inlet to said outlet only through said perforations of said stator shoes, wherein said shield and guide means comprises portions of said stators and shield means extending between adjacent stators, said portions of said stators and said shield means together with the stator shoes of said stators providing a partition in said housing dividing it into said inlet compartment and said outlet compartment, the arrangement being such that flow from said inlet and said inlet compartment passing through said perforations of said envelope wall is conducted to said outlet, whereas flow from said outlet and said inlet compartment passing only through said perforations of said stator shoes in returned to said inlet compartment.