Transfer apparatus

Abstract

A transfer apparatus is disclosed for transferring a light weight web from a dewatering section to a Yankee dryer. The transfer apparatus includes a looped transfer blanket which is disposed between the dewatering section and the Yankee dryer for supporting and transporting the web from the dewatering section towards the Yankee dryer. The dewatering section includes a press which defines a press nip for the passage therethrough of the web. The press nip assists in dewatering the web and guides the web. A press felt extends through the press nip and the transfer blanket also extends through the press nip. A roll is disposed downstream relative to the press nip for transferring the web from the transfer blanket and for guiding the web towards the Yankee dryer.

1 . A transfer apparatus for transferring a light weight web from a dewatering section to a Yankee dryer, said transfer apparatus comprising:
 a looped transfer blanket disposed between the dewatering section and the Yankee dryer for supporting and transporting the web from the dewatering section towards the Yankee dryer;   the dewatering section including:   a press defining a press nip for the passage therethrough of the web, said press nip assisting in dewatering the web, said press nip guiding the web;   a press felt extending through said press nip;   said transfer blanket extending through said press nip; and   a roll disposed downstream relative to said press nip for transferring the web from said transfer blanket and for guiding the web towards the Yankee dryer.   
     
     
         2 . A transfer apparatus as set forth in  claim 1  wherein
 said press includes: 
 a press roll for guiding the web; 
 a backing roll cooperating with said press roll such that said press roll and said backing roll define therebetween said press nip for the passage therethrough of the web; 
 said press felt extending through said press nip such that said press felt is disposed between said press roll and the web during passage of said press felt and the web through said press nip; 
 said transfer blanket extending through said press nip such that said transfer blanket is disposed between said backing roll and the web during passage of said transfer blanket and the web through said press nip. 
 
     
     
         3 . A transfer apparatus as set forth in  claim 1  wherein
 the dewatering section includes: 
 an elongate press shoe for guiding the web; 
 a backing roll co-operating with said press shoe for defining therebetween an extended nip for the passage therethrough of the web; 
 a press felt extending through said extended nip such that said press felt is disposed between said press shoe and the web during passage of said press felt and the web through said extended nip; 
 said transfer blanket extending through said extended nip such that said transfer blanket is disposed between said backing roll and the web during passage of said transfer blanket and the web through said extended nip; 
 a roll disposed downstream relative to said extended nip for transferring the web from said transfer blanket and for guiding the web towards the Yankee dryer. 
 
     
     
         4 . A transfer apparatus as set forth in  claim 3  wherein
 said looped transfer blanket is impervious to water such that, during transit of the web supported by said transfer blanket between said extended nip and said roll, rewetting of the web is inhibited. 
 
     
     
         5 . A transfer apparatus as set forth in  claim 3  wherein
 said roll is a transfer roll for transferring the web from said looped transfer blanket; 
 said transfer apparatus further including: 
 a pressure roll disposed downstream relative to said transfer roll; 
 a pressure roll felt extending around said transfer roll and said pressure roll such that when the web is transferred by said transfer roll from said transfer blanket to said pressure roll felt, the web is thereafter guided and supported by said pressure roll felt to and around said pressure roll so that the web is transferred from said pressure roll felt to the Yankee dryer for drying of the web. 
 
     
     
         6 . A transfer apparatus as set forth in  claim 5  wherein
 said transfer roll is a suction transfer roll. 
 
     
     
         7 . A transfer apparatus as set forth in  claim 3  wherein
 said roll is a suction pressure roll for transferring the web from said looped transfer blanket; 
 said transfer apparatus further including: 
 a pressure roll felt extending around said suction pressure roll such that when the web is transferred by said suction pressure roll from said transfer blanket to said pressure roll felt, the web is thereafter guided and supported by said pressure roll felt around said suction pressure roll so that the web is transferred from said pressure roll felt to the Yankee dryer for drying the web. 
 
     
     
         8 . A transfer apparatus as set forth in  claim 3  further including:
 a press section disposed upstream relative to said extended nip. 
 
     
     
         9 . A transfer apparatus as set forth in  claim 8  wherein
 said press section includes: 
 a pressing roll; 
 a further backing roll co-operating with said pressing roll for defining therebetween a pressing nip for the passage therethrough of the web. 
 
     
     
         10 . A transfer apparatus as set forth in  claim 9  further including:
 a pick up felt extending through said pressing nip such that said pick up felt is disposed between said pressing roll and the web during passage of said pick up felt and the web through said pressing nip. 
 
     
     
         11 . A transfer apparatus as set forth in  claim 9  further including:
 a further press felt extending through said pressing nip such that said further press felt is disposed between said further backing roll and the web during passage of said further press felt and the web through said pressing nip. 
 
     
     
         12 . A transfer apparatus as set forth in  claim 11  further including:
 a suction roll disposed downstream relative to said pressing nip and upstream relative to said extended nip, said suction roll co-operating with said further press felt for transferring the web from said further press felt to said press felt 
 
     
     
         13 . A transfer apparatus as set forth in  claim 12  wherein
 the web is disposed between said further press felt and said press felt. 
 
     
     
         14 . A transfer apparatus as set forth in  claim 10  wherein
 said pick up felt co-operates with a forming section for transferring the web from the forming section to said pick up felt. 
 
     
     
         15 . A transfer apparatus as set forth in  claim 3  further including:
 a suction press roll co-operating with said backing roll for defusing a nip therebetween, said nip being disposed upstream relative to said extended nip. 
 
     
     
         16 . A transfer apparatus as set forth in  claim 15  further including:
 a pick up felt extending between said suction pressing roll and said backing roll so that the web is disposed between said pick up felt and said backing roll during passage of the web through said nip, said pick up felt picking up the web from an upstream forming section. 
 
     
     
         17 . A transfer apparatus as set forth in  claim 16  further including:
 an upstream backing roll co-operating with said suction pressing roll for defining an upstream press nip therebetween, said upstream press nip being disposed upstream relative to said nip. 
 
     
     
         18 . A transfer apparatus as set forth in  claim 17  further including:
 a pressing felt extending between said upstream backing roll and said suction pressing roll so that the web is disposed between said pressing felt and said upstream backing roll during passage of the web through said upstream press nip. 
 
     
     
         19 . A transfer apparatus for transferring a light weight web from a dewatering section to a Yankee dryer, said transfer apparatus comprising:
 a looped transfer blanket disposed between the dewatering section and the Yankee dryer for supporting and transporting the web from the dewatering section towards the Yankee dryer;   the dewatering section including:   an elongate press shoe for guiding the web;   a backing roll co-operating with said press shoe for defining therebetween an extended nip for the passage therethrough of the web;   a press felt extending through said extended nip such that said press felt is disposed between said press shoe and the web during passage of said press felt and the web through said extended nip;   said transfer blanket extending through said extended nip such that said transfer blanket is disposed between said backing roll and the web during passage of said transfer blanket and the web through said extended nip;   a roll disposed downstream relative to said extended nip for transferring the web from said transfer blanket and for guiding the web towards the Yankee dryer; and   said looped transfer blanket being impervious to water such that during transit of the web supported by said transfer blanket between said extended nip and said roll, rewetting of the web is inhibited.   
     
     
         20 . A transfer apparatus for transferring a light weight web from a dewatering section to a Yankee dryer, said transfer apparatus comprising:
 a looped transfer blanket disposed between the dewatering section and the Yankee dryer for supporting and transporting the web from the dewatering section towards the Yankee dryer;   the dewatering section including:   an elongate press shoe for guiding the web;   a backing roll co-operating with said press shoe for defining therebetween an extended nip for the passage therethrough of the web;   a press felt extending through said extended nip such that said press felt is disposed between said press shoe and the web during passage of said press felt and the web through said extended nip;   said transfer blanket extending through said extended nip such that said transfer blanket is disposed between said backing roll and the web during passage of said transfer blanket and the web through said extended nip;   a roll disposed downstream relative to said extended nip for transferring the web from said transfer blanket and for guiding the web towards the Yankee dryer;   said looped transfer blanket being impervious to water such that during transit of the web supported by said transfer blanket between said extended nip and said roll, rewetting of the web is inhibited;   said roll being a transfer roll for transferring the web from said looped transfer blanket;   said transfer apparatus further including:   a pressure roll disposed downstream relative to said transfer roll;   a pressure roll felt extending around said transfer roll and said pressure roll such that when the web is transferred by said transfer roll from said transfer blanket to said pressure roll felt, the web is thereafter guided and supported by said pressure roll felt to and around said pressure roll so that the web is transferred from said pressure roll felt to the Yankee dryer for drying the web;   said transfer roll being a suction transfer roll;   a press section disposed upstream relative to said extended nip;   said press section including:   a pressing roll;   a further backing roll co-operating with said pressing roll for defining therebetween a pressing nip for the passage therethrough of the web;   a pick up felt extending through said pressing nip such that said pick up felt is disposed between said pressing roll and the web during passage of said pick up felt and the web through said pressing nip;   a further press felt extending through said pressing nip such that said further press felt is disposed between said further backing roll and the web during passage of said further press felt and the web through said pressing nip;   a suction roll disposed downstream relative to said pressing nip and upstream relative to said extended nip, said suction roll co-operating with said further press felt for transferring the web from said further press felt to said press felt, the web being disposed between said further press felt and said press felt; and   said pick up felt co-operates with a forming section for transferring the web from the forming section to said pick up felt.