Drainage foil for use in an installation for producing a paper web with a fabric belt, which can be moved over a multiplicity of drainage foils oriented transversely to its direction of movement

Abstract

A drainage foil for use in an installation for producing a paper web with a fabric belt, which can be moved over a multiplicity of drainage foils oriented transversely to a direction of movement. A surface of the drainage foil is formed with a defined profiling, which has elevations and/or depressions. The vertical extent of the profiling is at least 0.1 mm.

1 . A drainage foil for use in an installation for producing a paper web with a fabric belt, the fabric belt being moved over a multiplicity of drainage foils oriented transversely to a direction of movement, the drainage foil comprising:
 a drainage foil body having a surface formed with a defined profiling, said defined profiling having elevations and/or depressions, and a vertical extent of said defined profiling is at least 0.1 mm.   
     
     
         2 . The drainage foil according to  claim 1 , wherein said elevations and said depressions define said defined profiling and/or are distributed in a defined manner over said surface. 
     
     
         3 . The drainage foil according to  claim 1 , wherein said drainage foil body has ceramic plates disposed beside one another and defining said surface of said drainage foil body, said elevations and/or said depressions are formed on a surface of said ceramic plates, wherein the vertical extent of said defined profiling is at least 0.1 mm. 
     
     
         4 . The drainage foil according to  claim 1 , wherein the vertical extent of the defined profiling is up to 3.0 mm. 
     
     
         5 . The drainage foil according to  claim 1 , wherein said surface is formed with said defined profiling oriented in a longitudinal extent of said drainage foil body or enclosing an acute angle with said drainage foil body in a form of ribs that are triangular in cross section. 
     
     
         6 . The drainage foil according to  claim 1 , wherein said surface is formed with said defined profiling oriented in a longitudinal extent of said drainage foil body or enclosing an acute angle with said drainage foil body in a form of bars that are rectangular in cross section and rectangular grooves. 
     
     
         7 . The drainage foil according to  claim 1 , wherein said surface is formed with said defined profiling oriented in a longitudinal extent of said drainage foil body or enclosing an acute angle with said drainage foil body in a form of bars that are wave-shaped in cross section. 
     
     
         8 . The drainage foil according to  claim 3 , wherein said defined profiling of said ceramic plates disposed beside one another are offset with respect to one another transversely to a longitudinal direction of said drainage foil body. 
     
     
         9 . The drainage foil according to  claim 6 , wherein a longitudinal extent of said elevations and/or said depressions enclose an angle of 0° to 80° with a longitudinal extent of said drainage foil body. 
     
     
         10 . The drainage foil according to  claim 1 , wherein said defined profiling is formed by cut-outs formed in said surface and are concave in cross section and are disposed at a distance from one another or by cylindrical holes. 
     
     
         11 . The drainage foil according to  claim 1 , wherein said surface has a convex curvature in a section transverse to a longitudinal extent of said drainage foil body. 
     
     
         12 . The drainage foil according to  claim 11 , wherein said convex curvature has a radius of 100 mm to 500 mm. 
     
     
         13 . The drainage foil according to  claim 1 , wherein said surface has side edges that are rounded in cross section with a radius of 0.5 mm to 5 mm. 
     
     
         14 . The drainage foil according to  claim 1 , wherein the vertical extent of the profiling is up to 1.6 mm. 
     
     
         15 . The drainage foil according to  claim 1 , wherein the vertical extent of the profiling is between 0.2 mm and 0.8 mm. 
     
     
         16 . The drainage foil according to  claim 6 , wherein a longitudinal extent of said elevations and/or said depressions enclose an angle of 30° to 55° with the longitudinal extent of said drainage foil body. 
     
     
         17 . The drainage foil according to  claim 11 , wherein said convex curvature has a radius of 200 mm to 350 mm. 
     
     
         18 . The drainage foil according to  claim 1 , wherein said surface has side edges that are rounded in cross section with a radius of 1 mm to 3 mm. 
     
     
         19 . A kit for an installation for producing a paper web, comprising:
 a supporting frame configured to be detachable fixed on a suction box of the installation; and   drainage foils disposed on said supporting frame, said drainage foils each containing a drainage foil body having a surface formed with a defined profiling, said defined profiling having elevations and/or depressions, and a vertical extent of said defined profiling is at least 0.1 mm.   
     
     
         20 . An installation for producing a paper web, comprising:
 a plurality of drainage foils each containing a drainage foil body having a surface formed with a defined profiling, said defined profiling having elevations and/or depressions, and a vertical extent of said defined profiling is at least 0.1 mm; and   a fabric belt being moved over said plurality of drainage foils extending transversely to a direction of movement.