Machine for producing a material web

Abstract

The present invention provides a method and a press in a machine for producing or processing a material web, in particular a fibrous web, the press including a roller whose outer jacket is jointly enwrapped, at least in one wrap zone, respectively by at least a press belt, a support belt and a belt for dispersing water from the material web. The water-dispersing belt is located on the inside in contact with the outer jacket of the roller, the press belt on the outside and the support belt between the press belt and the water-dispersing belt. The material web is guided between the support belt and the water-dispersing belt through the wrap zone. At the end of the wrap zone, first the press belt is lifted off the support belt and then the support belt with the material web is lifted off the water dispersing belt.

1 . A press in a machine for one of producing and processing a material web, said press comprising: 
 a press belt;    a support belt;    a water-dispersing belt for dispersing water from the material web; and    a roller including an outer jacket, the press defining a wrap zone, said outer jacket being jointly enwrapped, at least in one said wrap zone, respectively by at least said press belt, said support belt, and said water-dispersing belt, said water-dispersing belt being located on an inside in contact with said outer jacket of said roller, said press belt being located on an outside, said support belt being between said press belt and said water-dispersing belt, said support belt and said water-dispersing belt configured for guiding the material web therebetween through said wrap zone, at an end of said wrap zone said press belt being configured for being lifted off said support belt and said support belt being configured for being lifted off said water-dispersing belt, with the material web, after said press belt is lifted off said support belt.    
   
   
       2 . The press according to  claim 1 , said roller includes at least one suction zone including an end in a web running direction, said end of said wrap zone being in a region of said end of said suction zone in said web running direction.  
   
   
       3 . The press according to  claim 2 , wherein said support belt is configured for being lifted off said water-dispersing belt, with the material web, in an arc angle range, relative to said end of said suction zone, of between >0° and <10°.  
   
   
       4 . The press according to  claim 2 , wherein said support belt is configured for being lifted off said water-dispersing belt, with the material web, in an arc angle range, relative to said end of said suction zone, of between >0° and 6°.  
   
   
       5 . The press according to  claim 2 , wherein said support belt is configured for being lifted off said water-dispersing belt, with the material web, in an arc angle range, relative to said end of said suction zone, of between 2° and 6°.  
   
   
       6 . The press according to  claim 2 , wherein said water-dispersing belt is configured for being lifted off said outer jacket of said roller one of at said end of said suction zone and thereafter.  
   
   
       7 . The press according to  claim 1 , wherein the material web is configured for being exposed to an air through-flow, said press belt, said support belt, the material web, and said water-dispersing belt configured for passing said air through-flow first through said press belt, then said support belt, then the material web, and then through said water-dispersing belt.  
   
   
       8 . The press according to  claim 1 , said press belt is configured for being lifted off said support belt by between 0° and 15° before said support belt and the material web are lifted off.  
   
   
       9 . The press according to  claim 1 , said press belt is configured for being lifted off said support belt by between 0° and 10° before said support belt and the material web are lifted off.  
   
   
       10 . The press according to  claim 1 , said press belt is configured for being lifted off said support belt by between 2° and 6° before said support belt and the material web are lifted off.  
   
   
       11 . The press according to  claim 1 , wherein said support belt includes one of a structured membrane and a structured mesh.  
   
   
       12 . The press according to  claim 11 , wherein the material web includes a fibrous web, said support belt configured for being a structure on which the fibrous web is formed.  
   
   
       13 . The press according to  claim 11 , wherein the material web includes a fibrous web, the fibrous web having a gsm substance of less than 42 g/cm 2 .  
   
   
       14 . The press according to  claim 13 , wherein the material web includes a fibrous web, the fibrous web being a tissue paper.  
   
   
       15 . The press according to  claim 1 , wherein said support belt includes a through air drying mesh.  
   
   
       16 . The press according to  claim 15 , wherein the material web includes a fibrous web, said through air drying mesh configured for being a structure on which the fibrous web is formed.  
   
   
       17 . The press according to  claim 1 , wherein said water-dispersing belt is configured for at least one of being permeable for a fluid and having a water absorption capacity.  
   
   
       18 . The press according to  claim 1 , wherein the produced material web is a fibrous web.  
   
   
       19 . The press according to  claim 18 , wherein the fibrous web has a specific bulk of over 10 g/cm 3 .  
   
   
       20 . The press according to  claim 18 , wherein the fibrous web has a specific bulk of over 14 g/cm 3 .  
   
   
       21 . The press according to  claim 18 , wherein the fibrous web has a specific bulk of over 16 g/cm 3 .  
   
   
       22 . The press according to  claim 18 , wherein the fibrous web has a water absorption capacity of more than 10 g water per gram fibrous web.  
   
   
       23 . The press according to  claim 18 , wherein the fibrous web has a water absorption capacity of more than 14 g water per gram fibrous web.  
   
   
       24 . The press according to  claim 18 , wherein the fibrous web has a water absorption capacity of more than 16 g water per gram fibrous web.  
   
   
       25 . A method for producing a material web, said method comprising the steps of: 
 forming a press nip by wrapping at least one press belt around an outer jacket of a roller;    passing the material web through said press nip, the material web being positioned between a support belt and a water-dispersing belt, said water-dispersing belt being located on an inside in contact with said outer jacket of said roller; and    at an end of a wrap zone, first lifting said press belt off said support belt and then lifting said support belt with the material web off said water-dispersing belt.