Method for the manufacture of paper, in particular of coated fine paper, and a paper machine line in particular for the manufacture of coated fine paper

Abstract

The present invention relates a method for the manufacture of paper, in particular of coated fine paper, in which method paper stock is fed from a headbox ( 100 ) to a wire section ( 200 ) in which water is drained from a paper web (W), in which method the paper web (W) is passed from the wire section ( 200 ) to a press section ( 300 ) to press water out of the paper web (W), and in which method, after the press section ( 300 ), the paper web (W) is dried in a dryer section ( 400 ), precalendered and coated in a coating station ( 600 ), after which the paper web (W) is dried in a drying section ( 650 ) and calendered in a final calender ( 900 ), and reeled in a reel-up ( 1000 ). In the method the stock is fed into the headbox ( 100 ) using multilayering technology, the paper web (W) is precalendered in a one or more reinforced-nip calender ( 500 ), the paper web (W) is coated in a film coating unit. The invention also relates to a paper machine line in particular for the manufacture of coated fine paper, which line comprises a headbox ( 100 ), a wire section ( 200 ), a press section ( 300 ), a dryer section ( 400 ), a precalender ( 500 ), a coating station ( 600 ) and drying section ( 680 ), a final calender ( 900 ) and a reel-up ( 1000 ). The paper machine line comprises multilayer headbox ( 100 ), a one or more reinforced-nip precalender ( 500 ), film coating station ( 600 ).

1 . A method for the manufacture of paper, in particular of coated fine paper, in which method paper stock is fed from a headbox ( 100 ) to a wire section ( 200 ) in which water is drained from a paper web (W), in which method the paper web (W) is passed from the wire section ( 200 ) to a press section ( 300 ) to press water out of the paper web (W), and in which method, after the press section ( 300 ), the paper web (W) is dried in a dryer section ( 400 ), precalendered and coated in a coating station ( 600 ), after which the paper web (W) is dried in a drying section ( 650 ) and calendered in a final calender ( 900 ), and reeled in a reel-up ( 1000 ), characterized in that in the method 
 the stock is fed into the headbox ( 100 ) using multilayering technology,    the paper web (W) is precalendered in a one or more reinforced-nip calender ( 500 ),    the paper web (W) is coated in a film coating unit.    
     
     
         2 . A method according to  claim 1 , characterized in that the method is used in upgrading a conventional paper making line for making surface sized paper to a paper making line for making coated woodfree paper.  
     
     
         3 . A method according to  claim 1  or  2 , characterized in that in the method 
 the stock is fed into the multilayering headbox ( 100 ),  
 in the wire section ( 200 ), water is drained from the paper web (W) in a forming section with loadable forming units,  
 in the press section ( 300 ), the paper web (W) is supported,  
 from the press section ( 300 ) to and in the first drying group, the web transfer is supported,  
 in the dryer section ( 400 ), at least part of the drying of the paper web (W) is carried out by means of impingement drying ( 450 ),  
 the paper web (W) is precalendered in a one or two reinforced-nip calender ( 500 ),  
 the paper web (W) is coated in a film coating unit,  
 after coating ( 600 ), the paper web (W) is dried by means of contact-free drying ( 660 ), and  
 the paper web (W) is calendered in a multinip calender ( 900 ).  
 
     
     
         4 . A method according to  claim 1 , characterized in that two felts or a felt and a transfer belt are used in the press nips in the press section ( 300 ).  
     
     
         5 . A method according to  claim 3 , characterized in that, in the method, combinations of impingement drying and cylinder drying or non-web-contacting drying and cylinder drying are applied to the drying of paper in order to accomplish a fast grade change.  
     
     
         6 . A method according to  claim 3 , characterized in that, in the method, a moistening device based on steam or water mist, placed before the precalender ( 500 ), is used.  
     
     
         7 . A method according to  claim 3 , characterized in that, in the method, the principal drying in the after-drying units is carried out without contact with the web.  
     
     
         8 . A method according to  claim 1 , characterized in that, in the method, linear loads of 100-750 kN and temperatures ≧250° C. of the thermo rolls and ≧30 mm long show nip are used in the calender ( 500 ).  
     
     
         9 . A method according to  claim 1 , characterized in that in the method film coating with compact color circulation is used.  
     
     
         10 . A paper machine line in particular for the manufacture of coated fine paper, which line comprises a headbox ( 100 ), a wire section ( 200 ), a press section ( 300 ), a dryer section ( 400 ), a precalender ( 500 ), a coating station ( 600 ) and drying section ( 680 ), a final calender ( 900 ) and a reel-up ( 1000 ), characterized in that the paper machine line comprises multilayer headbox ( 100 ), a one or more reinforced-nip precalender ( 500 ), a film coating station ( 600 ).  
     
     
         11 . A paper machine line according to  claim 10 , characterized in that the paper machine line is an upgraded paper machine line for making coated woodfree paper.  
     
     
         12 . A paper machine line according to  claim 10 , characterized in that the on-line calender is a multi-nip calender.  
     
     
         13 . A paper machine line according to  claim 10 , characterized in that the wire section is a gap former.  
     
     
         14 . A paper machine line according to  claim 10 , characterized in that in the press nips of the press section there are two felts or a felt and a transfer belt.  
     
     
         15 . A paper machine line according to  claim 10 , characterized in that its drying sections ( 400 , 600 ) comprise as a combination both cylinder drying and impingement drying or cylinder drying and non-web-contacting drying.  
     
     
         16 . A paper machine line according to  claim 10 , characterized in that the after-drying sections ( 600 , 750 , 850 ) have been so dimensioned that principal drying takes place without contact with the web.  
     
     
         17 . A paper machine line according to  claim 10 , characterized in that the paper machine line comprises a moistening device based on steam or water mist, placed before the precalender ( 500 ).  
     
     
         18 . A paper machine line according to  claim 10 , characterized in that the paper machine line comprises film coating unit with compact color circulation system.