Method and device for the production of a new fibrous web

Abstract

A method is cited to produce a fibrous web, especially a graphic paper web, from a pulp composition which consists of at least 20 weight % fibrous pulp which is selected from the group which consists of BCTMP, CTMP, APMP and any desired combination thereof and contains a maximum 80 weight % wood free pulp (kraft pulp), whereby the moving fibrous web is dried in a location in the drying section of the production machine in question by way of a high-temperature drying device where said web has a moisture content of at least 10% at a temperature of >110° C.

1 . A method of producing a web of fibrous material, said method comprising the steps of:
 providing a pulp composition which includes at least 20 weight % high yield pulp and a maximum 80 weight % wood free pulp; and   drying a moving said web of fibrous material in a location in a drying section of a paper machine by way of a high-temperature drying device where the web has a moisture content of at least 10% at a temperature of >110° C.   
   
   
       2 . The method according to  claim 1 , wherein said wood free pulp is kraft pulp. 
   
   
       3 . The method according to  claim 1 , wherein said high yield pulp includes a fibrous pulp including at least one of bleached chemi-thermo-mechanical pulp, chemi-thermo-mechanical pulp, and alkaline peroxide mechanical pulp. 
   
   
       4 . The method according to  claim 1 , wherein said high-temperature drying device is utilized in an area of the paper machine where the web has a moisture content of at least 20%. 
   
   
       5 . The method according to  claim 1 , wherein said high-temperature drying device is utilized in an area of the paper machine where the web has a moisture content of approximately 50%. 
   
   
       6 . The method according to  claim 1 , wherein said high-temperature drying device is utilized in an area of the paper machine where the web has a moisture content of approximately 55%. 
   
   
       7 . The method according to  claim 1 , wherein said high-temperature drying device is utilized in an area of the paper machine where the web has a moisture content in a range of approximately 10 to approximately 55%. 
   
   
       8 . The method according to  claim 1 , wherein said high-temperature drying device is utilized in an area of the paper machine where the web has a moisture content in a range of approximately 30 to approximately 55%. 
   
   
       9 . The method according to  claim 1 , wherein the web is dried by way of said high-temperature drying device at a temperature of >120° C. 
   
   
       10 . The method according to  claim 1 , wherein the web is dried by way of said high-temperature drying device at a temperature of >130° C. 
   
   
       11 . The method according to  claim 1 , wherein the web is dried by way of said high-temperature drying device at a temperature in a range of approximately 110 to 200° C. 
   
   
       12 . The method according to  claim 1 , wherein said high-temperature drying device includes at least one heated drying cylinder which is covered over a section of an outside circumference of said drying cylinder by at least one pressure hood which exerts pressure on said drying cylinder, the web being located on a side of said drying cylinder and being carried together with at least one wire belt and one impermeable clothing between said drying cylinder and said pressure hood. 
   
   
       13 . The method according to  claim 12 , wherein an operating temperature of said drying cylinder is selected to be >120° C. 
   
   
       14 . The method according to  claim 12 , wherein an operating temperature of said drying cylinder is selected to be >130° C. 
   
   
       15 . The method according to  claim 12 , wherein an operating temperature of said drying cylinder is selected to be in a range of approximately 110 to approximately 200° C. 
   
   
       16 . The method according to  claim 12 , wherein said drying section is a pre-drying section, said high-temperature drying device being located in said pre-drying section. 
   
   
       17 . The method according to  claim 12 , wherein said high-temperature drying device is located immediately following another high-temperature drying device in a direction of web travel, said other high-temperature drying device being a first high-temperature drying device, said high-temperature drying device being a second high-temperature drying device, said first high-temperature drying device including a heated drying cylinder, one side of the web being brought into contact with said heated drying cylinder of said first high-temperature drying device, another side of the web being brought into contact with said heated drying cylinder of said second high-temperature drying device. 
   
   
       18 . The method according to  claim 17 , wherein an operating temperature of said drying cylinder of at least said second high-temperature drying device, viewed in said direction of web travel, is selected to be >120° C. 
   
   
       19 . The method according to  claim 18 , wherein an operating temperature of said drying cylinder of said first high-temperature drying device, viewed in said direction of web travel, is lower than an operating temperature of said drying cylinder of said second high-temperature drying device. 
   
   
       20 . The method according to  claim 17 , wherein an operating temperature of said drying cylinder of at least said second high-temperature drying device, viewed in said direction of web travel, is selected to be >130° C. 
   
   
       21 . The method according to  claim 17 , wherein an operating temperature of said drying cylinder of at least said second high-temperature drying device, viewed in said direction of web travel, is selected to be in a range of approximately 110 to approximately 200° C. 
   
   
       22 . The method according to  claim 12 , wherein only one said high-temperature drying device is utilized with an existing two-sidedness of the web relative to at least one of a roughness and an absorbing capacity, and wherein the web which is fed into said high-temperature drying device is brought into contact with said drying cylinder of said high-temperature drying device with a rougher side of the web, said rougher side being a side of the web having a greater absorbing capacity. 
   
   
       23 . The method according to  claim 1 , wherein said drying section is a pre-drying section, wherein, for a compensation of an existing two-sidedness in the web with regard to at least one of a roughness and an absorbing capacity, a pre-calender is utilized as a high-temperature drying device at an end of said pre-drying section. 
   
   
       24 . The method according to  claim 23 , wherein a high-temperature softnip-calender is utilized as said pre-calender. 
   
   
       25 . The method according to  claim 23 , wherein a NipcoFlex shoe calender is utilized as said pre-calender. 
   
   
       26 . The method according to  claim 23 , wherein said pre-calender is located before one of a pre-coater and a pre-size press. 
   
   
       27 . The method according to  claim 23 , wherein said pre-calender is located after one of a pre-coater and a pre-size press. 
   
   
       28 . The method according to  claim 23 , wherein a pre-calendering process includes steam moistening. 
   
   
       29 . The method according to  claim 1 , wherein an existing two-sidedness of the web with regard to at least one of a roughness and an absorbing capacity is compensated in a coating section of said paper machine through a coating weight. 
   
   
       30 . The method according to  claim 29 , wherein the web is coated in said coating section through at least one of at least one of a direct and an indirect coating process, a blade coating, a film-coating, a spray coating, a curtain coating, and a multi-curtain coating. 
   
   
       31 . The method according to  claim 1 , wherein an existing two-sidedness of the web with regard to at least one of a roughness and an absorbing capacity is compensated in a final calendering process by way of a calender configured therefor. 
   
   
       32 . A device for producing a web of fibrous material, said device comprising:
 a device configured for producing a pulp composition which includes at least 20 weight % high yield pulp and a maximum of 80 weight % wood free pulp, said high yield pulp including a fibrous pulp selected from the group consisting of bleached chemi-thermo-mechanical pulp, chemi-thermo-mechanical pulp, alkaline peroxide mechanical pulp, and a combination thereof; and   a drying section including at least one high-temperature drying device configured for drying a moving said web at a temperature of >110° C. in a location where an arriving said web has a moisture content of at least 10%.   
   
   
       33 . The device according to  claim 32 , wherein said wood free pulp is kraft pulp. 
   
   
       34 . The device according to  claim 32 , wherein said high-temperature drying device is configured for being utilized in an area where said arriving web has a moisture content of at least 20%. 
   
   
       35 . The device according to  claim 32 , wherein said high-temperature drying device is configured for being utilized in an area where said arriving web has a moisture content of approximately 50%. 
   
   
       36 . The device according to  claim 32 , wherein said high-temperature drying device is configured for being utilized in an area where said arriving web has a moisture content of approximately 55%. 
   
   
       37 . The device according to  claim 32 , wherein said high-temperature drying device is configured for being provided in an area where said arriving web has a moisture content in a range of approximately 10 to approximately 55%. 
   
   
       38 . The device according to  claim 32 , wherein said high-temperature drying device is configured for being provided in an area where said arriving web has a moisture content in a range of approximately 30 to approximately 55%. 
   
   
       39 . The device according to  claim 32 , wherein said high-temperature drying device is configured for operating at a temperature of >120° C. 
   
   
       40 . The device according to  claim 32 , wherein said high-temperature drying device is configured for operating at a temperature of >130° C. 
   
   
       41 . The device according to  claim 32 , wherein said high-temperature drying device is configured for having an operating temperature in a range of approximately 110 to 200° C. 
   
   
       42 . The device according to  claim 32 , further including a pressure hood, wherein said high-temperature drying device includes at least one heated drying cylinder which is covered over a section of an outside circumference of said drying cylinder by at least one said pressure hood which exerts pressure on said drying cylinder, said drying cylinder including a side configured for being that on which the web is located, said drying cylinder and said pressure hood configured for being that which the web is carried therebetween together with at least one wire belt and one impermeable clothing. 
   
   
       43 . The device according to  claim 42 , wherein said drying cylinder is configured for operating at a temperature of >120° C. 
   
   
       44 . The device according to  claim 42 , wherein said drying cylinder is configured for operating at a temperature of >130° C. 
   
   
       45 . The device according to  claim 42 , wherein said drying cylinder is configured for having an operating temperature in a range of approximately 110 to approximately 200° C. 
   
   
       46 . The device according to  claim 42 , wherein said drying section is a pre-drying section, said high-temperature drying device being located in said pre-drying section. 
   
   
       47 . The device according to  claim 42 , further comprising another high-temperature drying device, said high-temperature drying device being located immediately following said other high-temperature drying device in a direction of web travel, said other high-temperature drying device being a first high-temperature drying device, said high-temperature drying device being a second high-temperature drying device, said first high-temperature drying device including a heated drying cylinder, said heated drying cylinder of said first high-temperature drying device configured for being that on which one side of the web is brought into contact, said heated drying cylinder of said second high-temperature drying device configured for being that on which another side of the web is brought into contact. 
   
   
       48 . The device according to  claim 47 , wherein said drying cylinder of at least said second high-temperature drying device, viewed in said direction of web travel, is configured for having an operating temperature which is >120° C. 
   
   
       49 . The device according to  claim 48 , wherein said drying cylinder of said first high-temperature drying device, viewed in said direction of web travel, is configured for having an operating temperature which is lower than an operating temperature of said drying cylinder of said second high-temperature drying device. 
   
   
       50 . The device according to  claim 47 , wherein said drying cylinder of at least said second high-temperature drying device, viewed in said direction of web travel, is configured for having an operating temperature which is >130° C. 
   
   
       51 . The device according to  claim 47 , wherein said drying cylinder of at least said second high-temperature drying device, viewed in said direction of web travel, is configured for having an operating temperature which is in a range of approximately 110 to approximately 200° C. 
   
   
       52 . The device according to  claim 47 , wherein only one said high-temperature drying device is provided, said drying cylinder of said high-temperature drying device being configured for being that which the web, which has a two-sidedness relative to at least one of a roughness and an absorbing capacity, comes into contact with a rougher side of the web, said rougher side being a side of the web having a greater absorbing capacity. 
   
   
       53 . The device according to  claim 1 , wherein said drying section is a pre-drying section, said pre-calender being configured for being utilized as a high-temperature drying device at an end of said pre-drying section for a compensation of an existing two-sidedness in the web with regard to at least one of a roughness and an absorbing capacity. 
   
   
       54 . The device according to  claim 53 , wherein said pre-calender is a high temperature softnip-calender. 
   
   
       55 . The device according to  claim 53 , wherein said pre-calender is a NipcoFlex shoe calender. 
   
   
       56 . The device according to  claim 53 , further including one of a pre-coater and a pre-size press, viewed in a direction of web travel said pre-calender being located before said one of a pre-coater and a pre-size press. 
   
   
       57 . The device according to  claim 53 , further including one of a pre-coater and a pre-size press, viewed in a direction of web travel said pre-calender being located after said one of a pre-coater and a pre-size press. 
   
   
       58 . The device according to  claim 53 , further including at least one steam moistening unit which is configured for pre-moistening and which is allocated to said pre-calender. 
   
   
       59 . The device according to  claim 32 , further including a device configured for compensating for an existing two-sidedness in the web with regard to at least one of a roughness and an absorbing capacity through appropriate at least one of control and adjustment of a coating weight in a coating section. 
   
   
       60 . The device according to  claim 32 , wherein said high-temperature drying device is formed as a final calender which is configured for compensating for an existing two-sidedness of the web with regard to at least one of a roughness and an absorbing capacity.