Papermaking machine

Abstract

Machine for a web having at least one marking device structured and arranged to apply at least two markings at a distance from one another in a longitudinal direction to the web. At least one measuring device is arranged downstream, relative to a web run direction, of the at least one marking device. The at least one measuring device is structured and arranged to measure the distance between the markings. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

1 . A machine for a web comprising: 
 at least one marking device structured and arranged to apply at least two markings at a distance from one another in a longitudinal direction to the web; and    at least one measuring device arranged downstream, relative to a web run direction, of said at least one marking device, structured and arranged to measure the distance between the markings.    
   
   
       2 . The machine as claimed in  claim 1 , wherein the machine is structured and arranged to produce a fibrous web from a fibrous stock suspension.  
   
   
       3 . The machine as claimed in  claim 2 , wherein the machine is structured and arranged for one of finishing or further processing said fibrous web.  
   
   
       4 . The machine as claimed in  claim 2 , wherein the fibrous web is one of a paper, board, or tissue web.  
   
   
       5 . The machine as claimed in  claim 1 , wherein said at least one measuring device is a non-contact measuring device.  
   
   
       6 . The machine as claimed in  claim 1 , wherein said at least one marking device is arranged in one of a wire former or in a press section of the machine.  
   
   
       7 . The machine as claimed in  claim 1 , further comprising at least one other measuring device structured and arranged to measure a length of a section of the web in the machine.  
   
   
       8 . The machine as claimed in  claim 7 , wherein said at least one other measuring device comprises one of a non-contact measuring device, a rotary encoder, a trigger device, a measuring device fitted to a roll, an encoder, or a device for measuring a drive signal.  
   
   
       9 . The machine as claimed in  claim 1 , further comprising a comparison device for comparing values measured by said at least one measuring device and by said at least one other measuring device.  
   
   
       10 . The machine as claimed in  claim 9 , wherein said comparison device is a control unit.  
   
   
       11 . The machine as claimed in  claim 9 , further comprising an evaluation unit to evaluate the measured values compared in said comparison device, wherein the measured values correspond to a stretching of the web during production.  
   
   
       12 . The machine as claimed in  claim 11 , wherein said evaluating device stores the measured values.  
   
   
       13 . The machine as claimed in  claim 11 , wherein said evaluation unit is one of connected to a control unit or assigned to a process unit.  
   
   
       14 . The machine as claimed in  claim 13 , wherein said control unit is arranged in said process unit, which is arranged to operate offline from the machine.  
   
   
       15 . The machine as claimed in  claim 11 , wherein said at least one measuring device is arranged to measure values relating to web stretch in at least one subsequent offline process.  
   
   
       16 . The machine as claimed in  claim 15 , wherein said at least one subsequent offline process is one of calendering, coating, or winding.  
   
   
       17 . A process for a web comprising: 
 applying at least two markings on the web, which are separated in a longitudinal direction of the web; and    measuring a distance between the at least two markings.    
   
   
       18 . The process in accordance with  claim 17 , wherein the distance measuring occurs in a region of a press section of a web production device.  
   
   
       19 . The process in accordance with  claim 17 , wherein the distance is measured without contacting the web.  
   
   
       20 . The process in accordance with  claim 17 , further comprising measuring a length of a section of the web in the machine.  
   
   
       21 . The process in accordance with  claim 20 , further comprising comparing the distance measured and the measured length of the web section.  
   
   
       22 . The process in accordance with  claim 20 , further comprising evaluating and storing values for the measured distance and the measured length of the web section, which corresponds to a stretching of the web.  
   
   
       23 . A machine for a web comprising: 
 at least one arrangement for applying at least two markings at a distance from one another in a longitudinal direction to the web;    at least one measuring device arranged downstream of said at least one arrangement in a web running direction of the web for measuring the distance between the markings; and    at least one control unit to control web stretching during the production of the web.