Device For Producing A Fibrous Web

Abstract

The invention relates to a device ( 1 ) for producing a pulp web ( 3 ), comprising an impingement drying system ( 5 ) with a first elongated impingement drying unit ( 7 ) and a second elongated impingement drying unit ( 9 ) lying adjacent to the first unit. The longitudinal axes (L) of the first and second impingement drying units ( 7, 9 ) run at an angle of inclination of 35°-55°, preferably 40°-50° and especially preferably approximately 45° in relation to a horizontal plane (HE) and the respective longitudinal directions (L) of the first and second impingement drying units ( 7, 9 ) run vertically and horizontally in opposite directions starting from their respective front sections ( 31, 33 ), or the respective longitudinal directions (L) run vertically in opposite directions starting from their respective front sections ( 31, 33 ) and horizontally in the same direction.

1 . A device ( 1 ) for producing a pulp web ( 3 ), transported by the device ( 1 ) along a transport path (Tw), through an impingement drying system ( 5 ), comprising:
 a first elongated impingement drying unit ( 7 ) and a second elongated impingement drying unit ( 9 ) adjacent to the first, where each drying unit has a longitudinal axis (L) extending between a front section ( 31 ,  33 ) where the web enters the drying unit and rear section ( 35   37 ) and two impingement surfaces ( 11 ,  13 ;  15 ,  17 ) which are arranged on opposite sides of the longitudinal axis (L) of the respective impingement drying unit ( 7 ;  9 ) and where each has its own supporting fabric ( 19 ;  21 ) which supports the pulp web ( 3 ) on one side from one side and each of which has an impingement dryer ( 39 ;  41 ) pointed towards at least one of the respective two impingement surfaces ( 11 ,  13 ,  15 ,  17 ) in order to have a direct effect on the side of the pulp web ( 3 ) facing away from the supporting fabric ( 19 ;  21 ), where the longitudinal axis (L) of each of the first and second impingement drying units ( 7 ,  9 ) is arranged at an angle of inclination of 35°-55°, in relation to a horizontal plane (HE), where the first and the second impingement drying units ( 7 ,  9 ) are arranged facing one another with their front section ( 31 ;  33 ) when viewed in longitudinal direction (L), and where the first and the second impingement drying unit ( 7 ,  9 ) extend slanted vertically beginning from their respective front section ( 31 ;  33 ) in their respective longitudinal direction (L) in opposite directions.   
     
     
         2 . Device ( 1 ) according to  claim 1 , wherein the longitudinal axis (L) of the first impingement dryer ( 7 ) and the longitudinal axis of the second impingement dryer ( 9 ) are arranged essentially parallel to one another. 
     
     
         3 . Device ( 1 ) according to  claim 1 , where the respective supporting fabric ( 19 ;  21 ) of the first and the second impingement drying unit ( 7 ;  9 ) runs in a convex arrangement in a transport path between the two respective impingement surfaces ( 11 ,  13 ;  15 ,  17 ). 
     
     
         4 . Device ( 1 ) according to  claim 1  where the respective supporting fabric ( 19 ;  21 ) of the first and second impingement drying unit ( 7 ;  9 ) circulates in an essentially convex loop. 
     
     
         5 . Device ( 1 ) according to  claim 1 , including a press section ( 43 ), where the impingement drying unit system ( 5 ) is arranged in the transport path (Tw) directly after the press section ( 43 ). 
     
     
         6 . Device ( 1 ) according to  claim 1  including a dryer section ( 61 ) with a plurality of drying cylinders ( 67 ), where the impingement drying system ( 5 ) is arranged in the transport path (Tw) immediately before the dryer section ( 61 ) or in the dryer section ( 61 ) between the drying cylinders. 
     
     
         7 . Device ( 1 ) according to  claim 1 , including a coating head for introducing a medium, to the pulp web ( 3 ), and wherein the impingement drying system ( 5 ) is arranged in the transport path (Tw) directly after the coating head. 
     
     
         8 . Device ( 1 ) according to  claim 1 , wherein the first impingement drying unit ( 7 ) is arranged in the transport path before the second impingement drying unit ( 9 ) and the first impingement drying unit ( 7 ) extends from its front section downwards and to the rear on a slant in relation to the horizontal plane (HE) in its longitudinal direction (L). 
     
     
         9 . Device ( 1 ) according to  claim 1 , wherein the impingement dryer ( 39 ) of at least the first impingement drying unit ( 7 ) is pointing towards both sides of the two respective impingement surfaces ( 11 ,  13 ) in order to have a direct effect on the side of the pulp web ( 3 ) facing away from the supporting fabric and an indirect effect through the supporting fabric ( 19 ) on the side of the pulp web ( 3 ) which is covered by the supporting fabric ( 19 ). 
     
     
         10 . Device ( 1 ) according to  claim 1 , wherein the supporting fabric ( 19 ;  21 ) is a wire belt with openings. 
     
     
         11 . Device ( 1 ) according to  claim 1 , wherein the pulp web ( 3 ) is supporting continuously by the respective supporting fabric ( 19 ,  21 ) in the respective impingement drying unit ( 7 ;  9 ). 
     
     
         12 . Device ( 1 ) according to  claim 1 , wherein several of said impingement drying systems ( 5 ) are arranged one behind the other in the transport path (Tw) and the longitudinal axes (L) of all impingement drying units ( 7 ,  9 ,  73 ,  75 ) are arranged essentially parallel to one another. 
     
     
         13 . Device ( 1 ) according to  claim 1 , wherein the first and the second impingement drying units ( 7 ;  9 ) each have a pulp web receiving point ( 53 ;  57 ) at which the pulp web ( 3 ) is transferred to the supporting fabric ( 19 ;  21 ) of the respective impingement drying unit ( 7 ;  9 ), and the pulp web receiving point ( 53 ;  57 ) is located in the front section ( 31 ;  33 ) of the respective impingement drying unit ( 7 ;  9 ). 
     
     
         14 . Device ( 1 ) according to  claim 1 , wherein the first and the second impingement drying units ( 7 ,  9 ) each have a pulp web release point ( 55 ;  59 ) at which the pulp web ( 3 ) is carried away from the supporting fabric ( 19 ;  21 ) of the respective impingement drying unit ( 7 ;  9 ), and the pulp web release point ( 55 ;  59 ) is located in the front section ( 31 ,  33 ) of the respective impingement drying unit ( 7 ,  9 ). 
     
     
         15 . Device ( 1 ) according to  claim 1 , wherein the impingement surfaces taper from the front section ( 31 ;  33 ) of the respective impingement drying unit ( 7 ;  9 ,  73 ;  75 ), toward the rear section. 
     
     
         16 . Device ( 1 ) according to  claim 1 , wherein the first and second impingement drying units ( 7 ;  9 ) extend vertically and horizontally in opposite directions, or extend beginning from their respective front section ( 31 ;  33 ) in their respective longitudinal direction (L) vertically in opposite directions and horizontally in the same direction. 
     
     
         17 . Device ( 1 ) according to  claim 2 , wherein the pulp web ( 3 ) is supporting continuously by the respective supporting fabric ( 19 ,  21 ) in the respective impingement drying unit ( 7 ;  9 ). 
     
     
         18 . Device ( 1 ) according to  claim 17 , wherein the first and the second impingement drying units ( 7 ,  9 ) each have a pulp web receiving point ( 53 ,  57 ) at which the pulp web ( 3 ) is transferred to the supporting fabric ( 19 ,  21 ) of the respective impingement drying unit ( 7 ,  9 ), and the pulp web receiving point ( 53 ,  57 ) is located in the front section ( 31 ,  33 ) of the respective impingement drying unit ( 7 ,  9 ). 
     
     
         19 . Device ( 1 ) according to  claim 18 , wherein the first and the second impingement drying units ( 7 ,  9 ) each have a pulp web release point ( 55 ,  59 ) at which the pulp web ( 3 ) is carried away from the supporting fabric ( 19 ,  21 ) of the respective impingement drying unit ( 7 ,  9 ), and the pulp web release point ( 55 ,  59 ) is located in the front section ( 31 ,  33 ) of the respective impingement drying unit ( 7 ,  9 ). 
     
     
         20 . ( 1 ) according to  claim 19 , wherein the impingement surfaces taper from the front section ( 31 ,  33 ) of the respective impingement drying unit ( 7 ,  9 ,  73 ,  75 ), toward the rear section.