Device for reducing a moisture content of a moist, fiber-containing material

Abstract

A device for reducing a moisture content of a moist, fiber-containing material has a double-belt press with a first endless belt and a second endless belt of metal, wherein a pressing zone for pressing liquid out of the fiber-containing material is configured between the first endless belt and the second endless belt, wherein, further, a belt of a liquid-absorbing material that is guided between the two endless belts and through the pressing zone is arranged, wherein a surface of the belt liquid-absorbing material that faces the first endless belt forms a contact surface for the fiber-containing material.

1 . A device ( 1 ) for reducing a moisture content of a moist, fiber-containing material ( 2 ), wherein the device has a double-belt press with a first endless belt ( 3 ) and a second endless belt ( 4 ), wherein a pressing zone ( 5 ) for pressing liquid out of the fiber-containing material ( 2 ) is configured between the first endless belt ( 3 ) and the of the second endless belt ( 4 ), wherein, further, a belt ( 6 ) of a liquid-absorbing material that is guided between the two endless belts ( 3 ,  4 ) and through the pressing zone ( 5 ) is arranged, wherein a surface of the belt ( 6 ) of liquid-absorbing material that faces the first endless belt ( 3 ) forms a contact surface for the fiber-containing material ( 2 ), wherein an outer side of the belt ( 13 ) of the second endless belt ( 3 ) that faces the belt ( 6 ) of liquid-absorbing material has channels ( 14 ) for discharging the liquid that run in a circumferential direction of the second endless belt ( 3 ), or diagonally to the circumferential direction of the second endless belt ( 3 ), preferably circumferential channels ( 14 ) that run in a closed loop in a circumferential direction of the second endless belt ( 3 ), wherein the channels ( 14 ) preferably have a depth between 50 μm and 1000 μm, in particular between 70 μm and 300 μm. 
     
     
         2 . The device according to  claim 1 , wherein the first and the second endless belt are manufactured of metal. 
     
     
         3 . The device according to  claim 1 , wherein the belt ( 6 ) of liquid-absorbing material is configured as an endless belt. 
     
     
         4 . The device according to  claim 1 , wherein the first endless belt ( 3 ) and the second endless belt ( 4 ) and the belt ( 6 ) of liquid-absorbing material are driven and are each arranged circumferentially between at least two rollers ( 7 ,  8 ,  9 ,  10 ,  11 ,  12 ). 
     
     
         5 . The device according to  claim 4 , wherein at least one of the rollers ( 7 ,  8 ,  9 ,  10 ,  11 ,  12 ) is heated. 
     
     
         6 . The device according to  claim 1 , wherein the first endless belt ( 3 ) has a circumferential length selected from the range from 3 m to 200 m, the second endless belt ( 4 ) has a circumferential length selected from the range from 3 m to 200 m and the belt ( 6 ) of liquid-absorbing material has a circumferential length selected from the range from 5 m to 250 m. 
     
     
         7 . The device according to  claim 1 , wherein the first endless belt ( 3 ) and the second endless belt ( 4 ) each have a thickness selected from the range from 0.1 mm to 3.5 mm, in particular from 0.2 mm to 1.5 mm, wherein the belt ( 6 ) of liquid-absorbing material has a thickness selected from the range from 1 mm to 10 mm, in particular from 2 mm to 4 mm. 
     
     
         8 . The device according to  claim 1 , wherein a width of the first endless belt ( 3 ) and a width of the second endless belt ( 4 ) and a width of the belt ( 6 ) of liquid-absorbing material, in each case, is greater than 0.5 m, preferably greater than 1.5 m, particularly preferably greater than 4 m. 
     
     
         9 . (canceled) 
     
     
         10 . The device according to  claim 1 , wherein the bottom endless belt ( 3 ) has cups ( 15 ), in particular blind holes, on the outer side of the belt for receiving the liquid. 
     
     
         11 . The device according to  claim 10 , wherein the cups ( 15 ) are arranged next to and/or between the channels ( 14 ) and end in the channels ( 14 ) and/or are connected with the channels ( 14 ) via conduits. 
     
     
         12 . The device according to  claim 1 , wherein the belt ( 6 ) of liquid-absorbing material is configured as a belt of a textile fabric, in particular of a non-woven textile fabric, in particular felt or fiber web. 
     
     
         13 . The device according to  claim 1 , wherein the belt ( 6 ) of liquid-absorbing material has a weight per unit area selected from the range from 500 g/m 2  to 2500 g/m 2  and/or a tensile strength selected from the range from 30 N/mm to 90 N/mm. 
     
     
         14 . The device according to  claim 1 , wherein the belt ( 6 ) of liquid-absorbing material is also configured as permeable to liquid. 
     
     
         15 . The device according to  claim 1 , wherein, in the in the pressing zone ( 5 ), a pressure between 0.1 to 20 MPa is ensured between the first endless belt ( 3 ) and the second endless belt ( 4 ). 
     
     
         16 . The device according to  claim 1 , wherein the second endless belt ( 4 ) is guided downwards, away from the belt ( 6 ), by means of at least one deflection device ( 17 ), in particular by means of at least one deflection roller, in at least one liquid suction zone ( 16 ) arranged upstream and/or downstream of the pressing zone ( 5 ) in a transport direction of the material ( 2 ), which liquid suction zone ( 16 ) serves to suck off the liquid pressed out of the fiber-containing material ( 2 ) in the pressing zone ( 5 ), so that the belt ( 6 ) of liquid-absorbing material does not rest against the second endless belt ( 4 ) in the liquid suction zone ( 16 ) and a free space ( 18 ) between the belt ( 6 ) of liquid-absorbing material and the second endless belt ( 4 ) is formed in the liquid suction zone ( 16 ), wherein the device ( 1 ) has a device ( 19 ) for sucking the liquid in the region of the free space ( 18 ) off the second end-less belt ( 4 ) in particular a suction device, for example in the form of a suction pump and/or vacuum chamber with at least one inflow for the liquid, wherein the belt ( 6 ) of liquid-absorbing material rests against the second endless belt ( 4 ) in the pressing zone ( 5 ). 
     
     
         17 . The device according to  claim 1 , wherein a separation zone ( 20 ) is arranged downstream of the pressing zone ( 5 ) in a transport direction of the fiber-containing material ( 2 ), wherein the second endless belt ( 4 ) is guided away from the first endless belt ( 3 ) together with the belt ( 6 ) of liquid-absorbing material by means of at least one deflection device ( 21 ), in particular by means of at least one deflection roller, in the separation zone ( 20 ), wherein a gap ( 22 ) is formed between the belt ( 6 ) of liquid-absorbing material and the first endless belt ( 3 ) in the separation zone ( 19 ). 
     
     
         18 . The device according to  claim 17 , wherein at least one nozzle for generating a gas flow, in particular an air knife ( 23 ), is arranged in the gap ( 22 ) in the separation zone ( 20 ) and is directed opposite the transport direction of the material ( 2 ) and between the belt ( 6 ) of liquid-absorbing material and the first endless belt ( 3 ). 
     
     
         19 . The device according to  claim 17 , wherein an impingement drying device ( 24 ) with at least one air outlet directed against a side of the fiber-containing material ( 2 ) that faces the belt ( 6 ) of liquid-absorbing material is arranged in the gap ( 22 ) in the separation zone ( 20 ). 
     
     
         20 . The device according to  claim 1 , wherein, to extend the process line, the fiber-containing material ( 2 ) is guided further, from a side ( 3   a ) of the first endless belt that faces the second endless belt ( 4 ) to a side of the first endless belt ( 3 ) that faces away from the second endless belt ( 4 ). 
     
     
         21 . An endless belt ( 3 ) for the device according to  claim 1 , wherein an outer side of the belt ( 13 ) of the endless belt ( 3 ) has cups ( 15 ), in particular blind holes, for receiving the liquid and/or has channels ( 14 ) for discharging the liquid that run in a circumferential direction of the endless belt ( 3 ), or diagonally to the circumferential direction of the endless belt ( 3 ), preferably channels ( 14 ) that run in a closed loop in a circumferential direction of the second endless belt ( 3 ), wherein the channels ( 14 ) preferably have a depth between 50 μm and 1000 μm, in particular between 70 μm and 300 μm. 
     
     
         22 . The endless belt according to  claim 21 , wherein the cups ( 15 ) are arranged next to and/or between the channels ( 14 ) and end in the channels ( 14 ) and/or are connected with the channels ( 14 ) via conduits. 
     
     
         23 . The endless belt according to  claim 21 , wherein the endless belt is manufactured of metal.