Method and Device for Applying a Coating Medium in a Machine Used for Producing a Fiber Web

Abstract

Disclosed is a machine for producing a paper web, cardboard web, or other fiber web ( 1 ), comprising a press section ( 2 ) which is provided with at least one press nip ( 5 ) formed by two squeeze rollers ( 3, 4 ) and in which a device ( 6, 7 ) for applying a medium, particularly starch, is disposed. The fiber web ( 1 ) can be guided through the press nip ( 5 ) along with a band ( 8 ). The inventive machine is characterized in that the device ( 6, 7 ) rests against at least one of the squeeze rollers ( 3, 4 ) for indirectly applying the medium to the fiber web ( 1 ).

1 . A machine for the production of a fibrous web ( 1 ) of paper, card or other material which has at least one pressing section ( 2 ) comprising a pressure nip ( 5 ) formed by two press rollers ( 3 ,  4 ) in which a device ( 6 ,  7 ) for the application of a medium is arranged, where the fibrous web ( 1 ) together with a belt ( 8 ) can be passed through the pressure nip ( 5 ), and wherein
 the device ( 6 ,  7 ) is fitted to at least one of the press rollers ( 3 ,  4 ) for indirect application onto the fibrous web ( 1 ).   
   
   
       2 . The machine as claimed in  claim 1 , wherein the at least one device ( 6 ,  7 ) for application is fitted to a mantle surface of one of the press rollers ( 3 ,  4 ), and wherein the medium applied to the mantle surface can be transferred to the fibrous web ( 1 ) in the pressure nip ( 5 ). 
   
   
       3 . The machine as claimed in  claim 2 , wherein
 a conditioning device ( 10 ) is fitted to the press roller ( 3 ).   
   
   
       4 . The machine as claimed in  claim 1 , wherein
 the at least one device ( 6 ,  7 ) for applying medium to a belt ( 8 ) is fitted in the area of a mantle surface of one the press rollers ( 4 ), and wherein the medium applied to the mantle surface can be transferred to the fibrous web ( 1 ) in the pressure nip ( 5 ).   
   
   
       5 . The machine as claimed in  claim 4 ,
 wherein   a conditioning device ( 11 ) is fitted to the belt ( 8 ).   
   
   
       6 . The machine as claimed in  claim 1 ,
 wherein   a drying unit ( 9 ,  18 ) for drying the applied medium on the fibrous web is arranged after the pressure nip ( 5 ) with respect to a direction of movement of the web.   
   
   
       7 . The machine as claimed in  claim 1 , wherein
 a further application device ( 21 ) for the application of a medium onto the fibrous web ( 1 ) is arranged in a drying section ( 19 ) following the pressing section ( 2 ).   
   
   
       8 . The machine as claimed in  claim 1 , wherein the device for application of a medium comprises a device for application of starch. 
   
   
       9 . The machine as claimed in  claim 7 , wherein the further application device for application of a medium comprises a further application device for application of a starch.