Method for refining cellulose fibers in aqueous suspension as well as refiner filling to implement said method

Abstract

The invention relates to a method for refining cellulose fibers in aqueous suspension, using a plurality of refiner fillings having refining edges, of which one is operated on at least one stator and another is operated on at least one rotor, and the suspension to be refined is processed between the two refiner fillings. A partial flow of the suspension delivered to the outlet side flows back on the back side of the refiner filling on the stator side, and then flows through openings located between the refining edges of the refiner filling on the stator side, and again into the refining zone. This leads to particularly uniform and economical refining.

1 . A method for refining a plurality of aqueous suspended cellulose fibers, said method comprising the steps of:
 carrying the plurality of cellulose fibers in an aqueous suspension between a stator-side refiner filling and a rotor-side refiner filling, said stator-side refiner filling being located on a stator and including a first face side and a first plurality of refining edges on said first face side, said rotor-side refiner filling being located on a rotor and including a second face side and a second plurality of refining edges on said second face side, said stator and said rotor providing a rotational movement relative to each other;   pressing said stator-side refiner filling and said rotor-side refiner filling against each other;   transferring a mechanical refining onto said plurality of cellulose fibers;   delivering said aqueous suspension to an inlet side of said stator-side and said rotor-side refiner fillings and then discharging again said aqueous suspension from an outlet side of said stator-side and said rotor-side refiner fillings;   flowing a partial flow of said aqueous suspension which was delivered to said outlet side through at least one hollow chamber located on a backside of said stator-side refiner filling and then through a plurality of openings which are located between certain ones of said first plurality of refining edges of said stator-side refiner filling and other ones of said first plurality of refining edges of said stator-side refiner filling.   
     
     
         2 . The method according to  claim 1 , wherein at least partially said stator-side refiner filling is used, a plurality of edges of said plurality of openings at least partially forming said first plurality of refining edges. 
     
     
         3 . The method according to  claim 1 , wherein at least partially said stator-side refiner filling is used, at least partially said first plurality of refining edges are formed by a plurality of refiner bars which protrude from a refining plate which is equipped with said plurality of openings. 
     
     
         4 . The method according to  claim 1 , wherein said at least one hollow chamber is at least one hollow space, said stator-side refiner filling being used and being equipped with a plurality of said hollow space and said plurality of openings, said aqueous suspension being carried through said plurality of hollow spaces from said outlet side to said plurality of openings. 
     
     
         5 . The method according to  claim 1 , wherein said at least one hollow chamber is at least one hollow space, said stator-side refiner filling being used, being equipped with said plurality of openings, and being connected detachably with a support in such a way that at least one said hollow space is formed through which said partial flow of said aqueous suspension is carried from said outlet side to said plurality of openings. 
     
     
         6 . The method according to  claim 1 , wherein said at least one hollow chamber is at least one hollow space, said stator-side refiner filling being used, being equipped with said plurality of openings, and being connected detachably with a support in such a way that a plurality of said hollow space are formed through which said partial flow of said aqueous suspension is carried from said outlet side to said plurality of openings. 
     
     
         7 . The method according to  claim 1 , wherein a greater part of said aqueous suspension is carried through said rotor-side refiner filling from said inlet side to said outlet side. 
     
     
         8 . The method according to  claim 1 , wherein said rotor-side refiner filling is used, no return flow of said aqueous suspension being generated on a backside of said rotor-side refiner filling, said rotor-side refiner filling being equipped with a plurality of refiner bars and a plurality of grooves located between said plurality of refiner bars. 
     
     
         9 . The method according to  claim 1 , wherein said at least one hollow chamber is at least one hollow space, said aqueous suspension flowing in a plurality of said hollow space being directed by a plurality of hydraulic guide elements in a direction toward said plurality of openings thereby one of reducing and totally avoiding a plurality of swirls. 
     
     
         10 . The method according to  claim 1 , wherein said aqueous suspension flowing through said plurality of openings is directed in a direction of said first plurality of refining edges by way of a plurality of guide surfaces which limit said plurality of openings whereby a plurality of swirls are one of reduced and totally avoided. 
     
     
         11 . A refiner filling, comprising:
 an inlet side for an aqueous suspension;   an outlet side for said aqueous suspension;   a first plurality of refiner edges located between said inlet side and said outlet side, said first plurality of refiner edges being suitable for refining said aqueous suspension;   at least one hydraulic connection between said outlet side and said first plurality of refiner edges through which said aqueous suspension can get from said outlet side to said first plurality of refiner edges, the refiner filling being a stator-side refiner filling and being configured for being used in a method for refining a plurality of aqueous suspended cellulose fibers, said method including the steps of:
 carrying said plurality of cellulose fibers in said aqueous suspension between said stator-side refiner filling and a rotor-side refiner filling, said stator-side refiner filling being located on a stator and including a first face side and said first plurality of refiner edges on said first face side, said rotor-side refiner filling being located on a rotor and including a second face side and a second plurality of refiner edges on said second face side, said stator and said rotor providing a rotational movement relative to each other; 
 pressing said stator-side refiner filling and said rotor-side refiner filling against each other; 
 transferring a mechanical refining onto said plurality of cellulose fibers; 
 delivering said aqueous suspension to said inlet side of said stator-side and said rotor-side refiner fillings and then discharging again said aqueous suspension from said outlet side of said stator-side and said rotor-side refiner fillings; 
 flowing a partial flow of said aqueous suspension which was delivered to said outlet side through at least one hollow chamber forming said at least one hydraulic connection located on a backside of said stator-side refiner filling and then through a plurality of openings which are located between certain ones of said first plurality of refiner edges of said stator-side refiner filling and other ones of said first plurality of refiner edges of said stator-side refiner filling. 
   
     
     
         12 . The refiner filling according to  claim 11 , wherein a plurality of said hydraulic connection are between said outlet side and said first plurality of refiner edges and are configured for getting said aqueous suspension from said outlet side to said first plurality of refiner edges. 
     
     
         13 . The refiner filling according to  claim 11 , wherein said at least one hollow chamber is at least one hollow space and the refiner filling includes an area of said backside, said at least one hollow space being located in said area of said backside of the refiner filling, being closed on said inlet side, being open on said outlet side, and being connected hydraulically with said plurality of openings which are located between said first plurality of refiner edges. 
     
     
         14 . The refiner filling according to  claim 13 , wherein the refiner filling includes a plurality of said hollow space which are located in said area of said backside of the refiner filling, are closed on said inlet side, are open on said outlet side, and are connected hydraulically with said plurality of openings which are located between said first plurality of refiner edges. 
     
     
         15 . The refiner filling according to  claim 13 , wherein said plurality of hollow spaces are open on said backside. 
     
     
         16 . The refiner filling according to  claim 13 , wherein said plurality of hollow spaces are closed on said backside. 
     
     
         17 . The refiner filling according to  claim 11 , wherein said plurality of openings include a plurality of edges that at least partially form said first plurality of refiner edges. 
     
     
         18 . The refiner filling according to  claim 11 , wherein the refiner filling includes a refining plate that is equipped with said plurality of openings, the refiner filling being equipped on said first face side with a plurality of refiner bars which protrude over said refining plate. 
     
     
         19 . The refiner filling according to  claim 11 , wherein said at least one hollow chamber is at least one hollow space, the refiner filling including a plurality of said hollow space and being equipped with a plurality of guide elements in said plurality of hollow spaces, said plurality of guide elements being positioned so that a liquid flowing in said plurality of hollow spaces is directed to said plurality of openings. 
     
     
         20 . The refiner filling according to  claim 11 , wherein the refiner filling includes a plurality of edges which limit said plurality of openings, said plurality of edges being a plurality of guide surfaces which are positioned so that a liquid flowing in said plurality of openings is continuously directed to said first plurality of refiner edges.