Method for producing a paper web, and paper machine

Abstract

The present invention relates to a method and a paper machine for producing a calendered paper web. The method includes the step of partially loading with ash a plurality of fibers of a fibrous stock suspension. The paper machine for the production of a calendered paper web from a fibrous stock suspension including a plurality of fibers which are partially loaded with ash includes a first device for loading a fibrous stock suspension with ash. The first device can include a first static mixer, a preparation unit for adding calcium oxide or calcium hydroxide, a press or a dewatering screw, an equalizing reactor or an equalizing screw, a container serving as a crystallizer, a second static mixer, and a carbon dioxide storage tank or a second device for recovering carbon dioxide.

1 . A method for producing a calendered paper web in a paper machine, said method comprising the step of partially loading with ash a plurality of fibers of a fibrous stock suspension.  
   
   
       2 . The method in accordance with  claim 1 , further comprising running the paper web through a calender which is equipped with a plurality of nips.  
   
   
       3 . The method in accordance with  claim 2 , further comprising applying a plurality of line loads greater than 50 kN/m to the paper web in said plurality of nips.  
   
   
       4 . The method in accordance with  claim 2 , further comprising applying a plurality of line loads greater than 100 kN/m to the paper web.  
   
   
       5 . The method in accordance with  claim 2 , further comprising applying a plurality of line loads greater than 350 kN/m to the paper web.  
   
   
       6 . The method in accordance with  claim 2 , further comprising drying the paper web to a moisture content of less than 5% and subsequently remoistening the paper web to a moisture content of more than 7% prior to said calender.  
   
   
       7 . A paper machine for the production of a calendered paper web from a fibrous stock suspension including a plurality of fibers which are partially loaded with ash, said paper machine comprising a first device for loading a fibrous stock suspension with ash.  
   
   
       8 . The paper machine in accordance with  claim 7 , wherein said first device comprises a first static mixer, a preparation unit for adding one of calcium oxide and calcium hydroxide, one of a press and a dewatering screw, one of an equalizing reactor and an equalizing screw, a container serving as a crystallizer, a second static mixer, and one of a carbon dioxide storage tank and a second device for recovering carbon dioxide.  
   
   
       9 . The paper machine in accordance with  claim 8 , further comprising at least one of a High Consistency Cleaner, a carbon dioxide heater, and a storage tank one of for a press water and for a water recovered in said dewatering screw.  
   
   
       10 . The paper machine in accordance with  claim 8 , further comprising a line and one of a header tank and an upstream third device, said line configured for returning any filtrate recovered in said dewatering screw one of to said header tank and to said upstream third device for preparing the fibrous stock suspension.  
   
   
       11 . The paper machine in accordance with  claim 8 , further comprising a washer apparatus for cleaning the fibrous stock suspension, said washer apparatus located after said container serving as said crystallizer.  
   
   
       12 . The paper machine in accordance with  claim 7 , further comprising a twin wire former.  
   
   
       13 . The paper machine in accordance with  claim 7 , further comprising one press section with at least one shoe press.  
   
   
       14 . The paper machine in accordance with  claim 7 , further comprising a calender with a plurality of nips.  
   
   
       15 . The paper machine in accordance with  claim 14 , further comprising an arrangement for remoistening of the paper web, said arrangement located before said calender.  
   
   
       16 . The paper machine in accordance with  claim 15 , wherein said arrangement comprises a steam blow box.  
   
   
       17 . The paper machine in accordance with  claim 7 , further comprising a coating unit.