Machine and method for the production of a fibrous web

Abstract

A machine for the production of a fibrous web, with a forming region, including a forming roll and a permeable inner belt which at least partially wraps around the forming roll together with an outer belt for formation of the fibrous web. A press device is immediately downstream from the forming region for additional dewatering of the fibrous web in a press nip and with a downstream drying cylinder. The fibrous web is carried supported on the inner belt from the forming region until the transfer to the heated surface of drying cylinder takes place. The inner belt is textured in order to provide texture to fibrous web and the transfer roll is a shoe roll in order to provide an extended transfer nip.

What is claimed is: 
     
         1 . A machine for the production of a fibrous web, in particular a tissue web, with a forming region, the machine comprising:
 a forming roll;   an outer belt;   a permeable inner belt which at least partially wraps around said forming roll together with said outer belt for formation of the fibrous web in a forming region; and   a press device immediately downstream from the forming region, the press device including:
 a press roll; 
 a lower press belt; 
 a transfer roll; 
 a mating roll along with said press roll forming a press nip for additional dewatering of the fibrous web, wherein the press nip is the first press nip of said press device, wherein the fibrous web is carried through said press nip supported between said inner belt and said lower press belt; and 
 a drying cylinder being downstream from said press device, wherein the fibrous web is carried supported on said inner belt in an extended transfer nip which is formed between said transfer roll and said drying cylinder from the forming region until the transfer from said inner belt to a heated surface of the drying cylinder, wherein said inner belt is textured providing texture to the fibrous web and said transfer roll is a shoe roll providing the extended transfer nip. 
   
     
     
         2 . The machine of  claim 1 , wherein said lower press belt is a water absorbing press belt, in particular a press felt. 
     
     
         3 . The machine of  claim 1 , wherein said press nip is a separate press nip. 
     
     
         4 . The machine of  claim 1 , wherein said press roll is a shoe roll to form an extended press nip. 
     
     
         5 . The machine of  claim 1 , wherein said press roll is arranged within a loop that is created by said inner belt and said mating roll is arranged within a loop that is created by said lower press belt, or that said press roll is arranged within the loop that is created by said lower press belt and that said mating roll is arranged within the loop that is created by said inner belt. 
     
     
         6 . The machine of  claim 1 , wherein said mating roll is a suction roll. 
     
     
         7 . The machine of  claim 1 , further comprising a steam blow box assigned to the fibrous web before said press nip when viewed in a machine direction, in order to impinge the fibrous web with steam. 
     
     
         8 . The machine of  claim 1 , further comprising a suction device located within a loop that is created by said inner belt, said suction device being located prior to said press nip when viewed in machine direction. 
     
     
         9 . The machine of  claim 8 , further comprising a blower hood assigned to said suction device for direct impingement of the fibrous web with steam and/or hot dry air and/or hot moist air. 
     
     
         10 . The machine of  claim 1 , further comprising a suction guide roll which is partially wrapped by said inner belt, said suction guide roll being arranged within a loop created by said inner belt and between said press nip and said transfer roll. 
     
     
         11 . The machine of  claim 10 , wherein said suction guide roll is partially wrapped in a wrap region by a permeable press belt in direct contact with the fibrous web. 
     
     
         12 . The machine of  claim 11 , further comprising a hood positioned within a loop created by said press belt and in said wrap region for indirect impingement of the fibrous web with steam and/or hot dry air and/or hot moist air. 
     
     
         13 . A method for the production of a fibrous web, in particular a tissue web, comprising the steps of:
 forming the fibrous web in a forming region, the forming region being where a forming roll and a permeable inner belt that at least partially wraps around said forming roll comes together with an outer belt;   dewatering the fibrous web in a press device which is located immediately downstream from the forming region, the press device having a press nip which is formed by a press roll and a mating roll;   supportedly carrying the fibrous web between said inner belt and a lower press belt through said press nip, wherein said press nip is a first press nip of the press device through which the fibrous web is routed;   drying the fibrous web by a drying cylinder that is located downstream from the press device, wherein the fibrous web is delivered, in a transfer nip that is formed between a transfer roll and said drying cylinder, to a heated surface of said drying cylinder, the fibrous web being transported from the forming region to the transfer supported on said inner belt, said inner belt being textured, so that the fibrous web becomes textured and the fibrous web is carried supported between said inner belt and a lower press belt through said press nip.   
     
     
         14 . The method of  claim 13 , wherein said lower press belt is a water absorbing press belt, in particular a press felt.