Paper Machine, Especially a Tissue Paper Machine

Abstract

In a tissue paper making machine downstream the yankee-cylinder ( 9 ) and upstream the tambour roll ( 14 ) a spark detector ( 13 ) is provided in the vicinity of the paper web running to the winding-up section ( 4 ) in order to detect sparks of glowing fibers or fiber conglomerates, which can be enrailed by the high speed run of the paper web and can be transferred to the paper roll ( 15 ) where the sparks are trapped between the paper web windings of the paper mill. Knowledge of this fact offers the possibility to avoid fire in the mother-roll storage.

1 . Paper machine, especially tissue paper machine, comprising in downstream direction at least one head box ( 1 ), at least one forming section ( 2 ), at least one drying section ( 3 ) and downstream of the most-downstream drying section a winding-up section ( 4 ) including a winding-up roll ( 14 ) for forming a paper roll (mother roll) ( 15 ), characterized in that behind the most downstream drying section ( 3 ) or at least upstream the winding-up section ( 4 ) a spark detector ( 13 ) is provided in the vicinity of the paper web (W) running to the winding-up section ( 4 ). 
   
   
       2 . Paper machine according to  claim 1 , characterized in that in a tissue paper machine the spark detector ( 13 ) is provided downstream the yankee cylinder ( 9 ). 
   
   
       3 . Paper machine according to  claim 1 , characterized in that cleaning air jet means ( 23 ) is provided, wherein the air jet thereof is directed to the spark detector ( 13 ). 
   
   
       4 . Paper machine according to  claim 1 , characterized in that the spark detector ( 13 ) is combined with a web run-guiding means ( 18 ) stabilising the web run. 
   
   
       5 . Paper machine according to  claim 4 , characterized in that the web run-guiding means ( 18 ) comprises at least one guiding surface ( 20 ) behind which a space ( 21 ) is provided surrounded at least partly by a casing ( 19 ), in which an air-inlet-opening ( 22 ) is provided such that air sucked in by an under pressure created by the web run is directed to the spark detector ( 13 ) for cleaning purpose. 
   
   
       6 . Paper machine according to  claim 1 , characterized in that the spark detector ( 13 ) is provided downstream a web measuring means ( 12 ). 
   
   
       7 . Paper machine according to  claim 2 , characterized in that cleaning air jet means ( 23 ) is provided, wherein the air jet thereof is directed to the spark detector ( 13 ). 
   
   
       8 . Paper machine according to  claim 2 , characterized in that the spark detector ( 13 ) is combined with a web run-guiding means ( 18 ) stabilising the web run. 
   
   
       9 . Paper machine according to  claim 3 , characterized in that the spark detector ( 13 ) is combined with a web run-guiding means ( 18 ) stabilising the web run. 
   
   
       10 . Paper machine according to  claim 2 , characterized in that the spark detector ( 13 ) is provided downstream a web measuring means ( 12 ). 
   
   
       11 . Paper machine according to  claim 3 , characterized in that the spark detector ( 13 ) is provided downstream a web measuring means ( 12 ). 
   
   
       12 . Paper machine according to  claim 4 , characterized in that the spark detector ( 13 ) is provided downstream a web measuring means ( 12 ). 
   
   
       13 . Paper machine according to  claim 5 , characterized in that the spark detector ( 13 ) is provided downstream a web measuring means ( 12 ).