Method And Apparatus For Treating A Fibre Web

Abstract

Method and arrangement for processing a paper or board web ( 1 ) or similar fibre web, in which method a processing mixture is spread onto the surface of the web. hi the method, the web ( 1 ) to be processed is lead from a press nip ( 8 ) and pressed between rolls ( 8 ) in this nip. Before the web enters the nip, such an amount of processing mixture is spread onto at least one side of the web ( 1 ), that the processing mixture is still wet when it enters the nip.

1 . (canceled) 
     
     
         2 . The method of  claim 33 , wherein the processing mixture is spread from spray nozzles onto both sides of the web before the web enters the press nip. 
     
     
         3 . The method of  claim 2 , an amount of processing mixture remaining on the web is altered by altering a distance between the spray nozzles and the press nip, in order to alter a delay time between spreading of the processing mixture and setting of the processing mixture spread on the web. 
     
     
         4 . The method of  claim 2 , wherein the processing mixture is heated prior to being fed from the nozzles onto the surface of the web. 
     
     
         5 . The method of  claim 33 , further comprising spreading processing mixture on at least one of the moving surfaces of the press nip so that additional processing mixture is fed to the press nip and onto a surface of the web. 
     
     
         6 . The method of  claim 33 , wherein the processing mixture is spread onto the surface of the web using pressure-dispersion nozzles. 
     
     
         7 . The method of  claim 33 , wherein the processing mixture is spread onto the surface of the web using gas-dispersion nozzles. 
     
     
         8 . The method of  claim 33 , wherein the press nip is formed by two rolls. 
     
     
         9 . The method of  claim 33 , wherein the two moving surfaces of the press nip comprise a surface of a roll and a surface of a belt. 
     
     
         10 . The method of  claim 8  wherein a surface of at least one roll is soft. 
     
     
         11 . The method of  claim 8  wherein a surface of at least one roll is hard. 
     
     
         12 . The method of  claim 8 , wherein at least one roll can be heated. 
     
     
         13 . The method of  claim 8 , wherein at least one roll can be cooled. 
     
     
         14 . The method of  claim 12 , wherein the at least one heated roll transfers sufficient heat to the web that drying is not needed after the press nip. 
     
     
         15 . The method of  claim 33 , further comprising calendering the web in the press nip after spreading the processing mixture on the web. 
     
     
         16 . The method of  claim 33 , wherein the press nip comprises a shoe nip. 
     
     
         17 . (canceled) 
     
     
         18 . The apparatus of  claim 51 , wherein the spray nozzles are arranged on both sides of the web. 
     
     
         19 . The apparatus of  claim 51 , further comprising an element for heating the processing mixture prior to being spread on the web. 
     
     
         20 . The apparatus of  claim 51 , wherein the press nip comprises a roll, and further comprising an element for spreading the processing mixture onto a surface of the roll. 
     
     
         21 . The apparatus of  claim 51 , wherein the spray nozzles are pressure-dispersion nozzles. 
     
     
         22 . The apparatus of  claim 51 , wherein the spray nozzles are gas-dispersion nozzles. 
     
     
         23 . The apparatus of  claim 51 , further comprising a casing in which the spray nozzles are located. 
     
     
         24 . The apparatus of  claim 23 , wherein the casing can be moved relative to the press nip. 
     
     
         25 . The apparatus of  claim 51 , wherein the press nip comprises two rolls. 
     
     
         26 . The apparatus of  claim 51 , wherein the press nip comprises a belt and a roll. 
     
     
         27 . The apparatus of  claim 25  wherein a surface of at least one roll is soft. 
     
     
         28 . The apparatus of  claim 25  wherein a surface of at least one roll is hard. 
     
     
         29 . The apparatus of  claim 25 , wherein at least one roll can be heated. 
     
     
         30 . The apparatus of  claim 25 , wherein at least one roll can be cooled. 
     
     
         31 . The apparatus of  claim 51 , wherein the press nip is a calender nip. 
     
     
         32 . The apparatus of  claim 51 , wherein the press nip is a shoe nip. 
     
     
         33 . A method for processing a paper or board web or similar fibre web comprising:
 leading a web to be processed from a last cylinder of a dryer-cylinder group to a press nip formed between two moving surfaces;   spreading an amount of a processing mixture on at least one surface of the web between the last cylinder of the dryer-cylinder group and the press nip so that the processing mixture is wet when it enters the press nip; and   pressing the processing mixture into the web in the press nip.   
     
     
         34 . The method of  claim 8 , wherein the two rolls comprise a film-transfer press. 
     
     
         35 . The method of  claim 9 , wherein at least one of the surface of the roll and the surface of the belt is soft. 
     
     
         36 . The method of  claim 9 , wherein at least one of the surface of the roll and the surface of the belt is hard. 
     
     
         37 . The method of  claim 10 , wherein a surface of one roll is hard. 
     
     
         38 . The method of  claim 9 , wherein at least one of the roll and the belt can be heated. 
     
     
         39 . The method of  claim 10 , wherein at least one roll can be heated. 
     
     
         40 . The method of  claim 35 , wherein at least one of the roll and the belt can be heated. 
     
     
         41 . The method of  claim 11 , wherein at least one roll can be heated. 
     
     
         42 . The method of  claim 36 , wherein at least one of the roll and the belt can be heated. 
     
     
         43 . The method of  claim 9 , wherein at least one of the roll and the belt can be cooled. 
     
     
         44 . The method of  claim 10 , wherein at least one roll can be cooled. 
     
     
         45 . The method of  claim 35 , wherein at least one of the roll and the belt can be cooled. 
     
     
         46 . The method of  claim 11 , wherein at least one roll can be cooled. 
     
     
         47 . The method of  claim 36 , wherein at least one of the roll and the belt can be cooled. 
     
     
         48 . The method of  claim 12 , wherein at least one of the rolls can be cooled. 
     
     
         49 . The method of  claim 38 , wherein at least one of the roll and the belt can be cooled. 
     
     
         50 . The method of  claim 38 , wherein the at least one of the heated roll and the belt transfers sufficient heat to the web that drying is not needed after the press nip. 
     
     
         51 . An apparatus for processing a paper or board web or a similar fibre web comprising:
 at least one press nip;   transporting elements for transporting the web to the press nip; and   spreading elements for spreading an amount of a wet processing mixture on at least one surface of the web before the web enters the press nip, the spreading elements being positioned so that the processing mixture spread on the web is wet when the web enters the press nip, the spreading elements comprising spray nozzles positioned an adjustable distance from the press nip.   
     
     
         52 . The apparatus of  claim 25 , wherein the rolls are part of a film transfer press. 
     
     
         53 . The apparatus of  claim 26 , wherein a surface of at least one of the roll and the belt is soft. 
     
     
         54 . The apparatus of  claim 26 , wherein a surface one of the roll and the belt is hard. 
     
     
         55 . The apparatus of  claim 27 , wherein a surface of one roll is hard. 
     
     
         56 . The apparatus of  claim 26 , wherein at least one of the roll and the belt can be heated. 
     
     
         57 . The apparatus of  claim 27 , wherein at least one roll can be heated. 
     
     
         58 . The apparatus of  claim 53 , wherein at least one of the roll and the belt can be heated. 
     
     
         59 . The apparatus of  claim 28 , wherein at least one roll can be heated. 
     
     
         60 . The apparatus of  claim 54 , wherein at least one of the roll and the belt can be heated. 
     
     
         61 . The apparatus of  claim 26 , wherein at least one of the roll and the belt can be cooled. 
     
     
         62 . The apparatus of  claim 27 , wherein at least one roll can be cooled. 
     
     
         63 . The apparatus of  claim 53 , wherein at least one of the roll and the belt can be cooled. 
     
     
         64 . The apparatus of  claim 28 , wherein at least one roll can be cooled. 
     
     
         65 . The apparatus of  claim 54 , wherein at least one of the roll and the belt can be cooled.