Device and process for transferring a material web

Abstract

A device for transferring a material web, particularly a web made of paper, board, tissue, or other pulp. In order to transfer the material web and, preferably, a supporting belt from a first supporting surface to a subsequent supporting surface, a pick-up zone to lift the material web off the first supporting surface and a stabilizing zone to stabilize the material web are arranged before the subsequent supporting surface, where vacuum can be applied to the pick-up zone and the stabilizing zone from one vacuum source each. Here, the pick-up zone is sub-divided into at least two pick-up sub-zones across the material web running direction, where the vacuum can be switched on separately in at least one pick-up sub-zone. This invention also relates to a process for transferring a material web performed with the device according to the invention.

1 . A device for transferring a material web from a first supporting surface to a subsequent supporting surface, the device comprising:
 a pick-up zone adapted to lift the material web off the first supporting surface, the pick-up zone being connected to a vacuum source and being limited by first and second sealing mechanisms, the pick-up zone being sub-divided into at least two pick-up sub-zones across a material web running direction, where the vacuum can be switched on separately in at least one pick-up sub-zone; and   a stabilizing zone disposed proximate to the subsequent supporting surface, the stabilizing zone connected to a vacuum source and being limited by the second sealing mechanism and a seal, respectively, and the subsequent supporting surface.   
   
   
       2 . The device of  claim 1 , wherein the pick-up zone is sub-divided into 3 to 8 pick-up sub-zones. 
   
   
       3 . The device of  claim 2 , wherein the pick-up zone is sub-divided into 4 to 6 pick-up sub-zones. 
   
   
       4 . The device of  claim 1 , further comprising a damper provided to switch on the vacuum in at least one connecting duct linking an associated pick-up sub-zone with a vacuum source. 
   
   
       5 . The device of  claim 1 , further comprising a setting damper mounted in a connecting duct linking an associated pick-up sub-zone with a vacuum source. 
   
   
       6 . The device of  claim 1 , wherein the individual pick-up sub-zones are connected to the same vacuum source. 
   
   
       7 . A process for transferring a material web from a first supporting surface to a subsequent supporting surface, the process comprising:
 lifting the material web off the first supporting surface in a pick-up zone using vacuum, the pick-up zone being sub-divided into at least two pick-up sub-zones across a material web running direction, the vacuum being applied separately to the pick-up sub-zones; and   stabilizing the material web before the subsequent supporting surface in a stabilizing zone using vacuum.   
   
   
       8 . The process of  claim 7 , further comprising setting or adjusting the vacua in the pick-up sub-zones independently of one another. 
   
   
       9 . The process of  claim 7 , further comprising applying vacuum to the pick-up sub-zones separately from one another when widening the material web. 
   
   
       10 . The process of  claim 9 , wherein only those pick-up sub-zones over which the material web passes being placed under vacuum.