Papermaking Machine And Papermaking Method

Abstract

The present invention relates to a papermaking machine and papermaking method that make paper web by removing moisture while making a paper stock layer travel, and the object of the invention is to dehydrate the paper stock layer more efficiently. A papermaking machine for making continuous paper web by holding a paper stock suspension 1 a jetted from a head box 2 into the shape of a layer, and removing moisture while making this paper stock layer 1 travel. The papermaking machine is provided with steam type heating means 6 and adjustment means 11 . The steam type heating means 6 is provided in a moisture removing part as heating means for heating the paper stock layer 1 to accelerate the moisture removal, and supplies steam to the paper stock layer 1 and heats the paper stock layer 1 by condensation of the steam. The adjustment means 11 adjusts the supply of the steam performed by the steam type heating means 6 , on the basis of a stock concentration of the paper stock layer 1 detected when passing through the steam type heating means 6 , so that the paper stock layer 1 reaches a preset target temperature.

1 - 18 . (canceled)  
   
   
       19 . A papermaking machine for making paper web by holding a paper stock suspension jetted from a head box into the shape of a layer, and removing moisture while traveling the paper stock layer, comprising: 
 steam type heating means, provided in a moisture removing part as heating means for heating said paper stock layer to accelerate said moisture removal, for supplying steam to said paper stock layer and heating said paper stock layer by condensation of said steam; and    adjustment means for adjusting the supply of said steam performed by said steam type heating means, on the basis of a stock concentration of said paper stock layer detected when passing through said steam type heating means, so that said paper stock layer reaches a preset target temperature;    wherein said moisture removing part is a former which forms a layer of paper by holding said paper stock suspension jetted from said head box into the shape of a layer, and removes moisture while traveling the paper stock layer, or a press part which further removes moisture by applying pressure to said paper stock layer formed into the paper layer by said former;    said former is constructed as twin wire formers equipped with wires on both sides of said paper stock layer;    said steam type heating means is provided with a steam box for guiding the supply of steam to said paper stock layer, and said steam box is arranged so that the fringe of its tip opening abuts said wire or is very near said wire;    further comprising a suction box for suctioning steam jetted from said steam box toward a side opposite to said steam box across said paper stock layer; and    another suction box besides to said suction box arranged on said side opposite to said steam box across said paper stock layer and downstream in the traveling direction of said paper stock layer;    wherein suction force of the downstream suction box is set larger than that of the upstream suction box.    
   
   
       20 . The papermaking machine as set forth in  claim 19 , wherein the fringe of the tip opening of said steam box is provided with seal means for sealing said steam box.  
   
   
       21 . The papermaking machine as set forth in  claim 20 , wherein said seal means is a seal member which is attached to the fringe of the tip opening of said steam box and abuts said wire.  
   
   
       22 . The papermaking machine as set forth in  claim 20 , wherein said seal means is a gas jet device which is provided upstream in the traveling direction of said paper stock layer relative to the fringe of the tip opening of said steam box, and suppresses incursion of wake of said paper stock layer into said steam box by jetting gas.  
   
   
       23 . The papermaking machine as set forth in  claim 19 , wherein a downstream end of said suction box in the traveling direction of said paper stock layer is arranged downstream relative to a downstream end of said steam box in the traveling direction of said paper stock layer.  
   
   
       24 . The papermaking machine as set forth in  claim 19 , wherein said steam box is divided into a plurality of parts in the width direction of said paper stock layer and said suction box is divided into a plurality of parts so as to correspond to the divided parts of said steam box, and wherein a jet of steam and suction of steam are adjustable for each of the divided parts of said steam box and said suction box.  
   
   
       25 . The papermaking machine as set forth in  claim 19 , wherein said steam supplied by said steam type heating means heats said paper stock layer by acting on said paper stock layer as a collision jet.  
   
   
       26 . The papermaking machine as set forth in  claim 19 , further comprising control means for automatically adjusting said adjustment means.  
   
   
       27 . The papermaking machine as set forth in  claim 26 , further comprising: 
 stock concentration detecting means, provided in the vicinity of said steam type heating means, for detecting a stock concentration of said paper stock layer when passing through said steam type heating means;    wherein said control means controls the supply of steam performed by said steam type heating means, on the basis of information detected by said stock concentration detecting means, so that said paper stock layer is raised to said target temperature.    
   
   
       28 . The papermaking machine as set forth in  claim 19 , further comprising: 
 air jet type heating means for blowing high-temperature air against said paper stock layer and heating said paper stock layer by a collision jet of said high-temperature air, provided as heating means for heating said paper stock layer, downstream in the traveling direction of said paper stock layer relative to a position at which said steam type heating means is installed.    
   
   
       29 . The papermaking machine as set forth in  claim 28 , wherein said heating means comprises first heating means for performing heating on one side of said paper stock layer, and second heating means for performing heating on the other side of said paper stock layer.  
   
   
       30 . A papermaking method of making paper web by holding a paper stock suspension jetted from a head box into the shape of a layer, and removing moisture while making the paper stock layer travel, comprising the steps of: 
 supplying steam to said paper stock layer at a heating position and heating said paper stock layer by condensation of said steam, in such a way that said paper stock layer reaches a preset target temperature; and    suctioning and removing moisture from said paper stock layer.    
   
   
       31 . A papermaking machine for making paper web by holding a paper stock suspension jetted from a head box into the shape of a layer, and removing moisture while traveling the paper stock layer, comprising: 
 steam type heating means, provided in a moisture removing part as heating means for heating said paper stock layer to accelerate said moisture removal, for supplying steam to said paper stock layer and heating said paper stock layer by condensation of said steam;    adjustment means for adjusting the supply of said steam performed by said steam type heating means, on the basis of a stock concentration of said paper stock layer detected when passing through said steam type heating means, so that said paper stock layer reaches a preset target temperature; and    air jet type heating means for blowing high-temperature air against said paper stock layer and heating said paper stock layer by a collision jet of said high-temperature air, provided as heating means for heating said paper stock layer, downstream in the traveling direction of said paper stock layer relative to a position at which said steam type heating means is installed.    
   
   
       32 . The papermaking machine as set forth in  claim 31 , wherein said moisture removing part is a former which forms a layer of paper by holding said paper stock suspension jetted from said head box into the shape of a layer, and removes moisture while traveling the paper stock layer, or a press part which further removes moisture by applying pressure to said paper stock layer formed into the paper layer by said former.  
   
   
       33 . The papermaking machine as set forth in  claim 32 , wherein said former is constructed as twin wire formers equipped with wires on both sides of said paper stock layer.  
   
   
       34 . The papermaking machine as set forth in  claim 33 , wherein said steam type heating means is provided with a steam box for guiding the supply of steam to said paper stock layer, and said steam box is arranged so that the fringe of its tip opening abuts said wire or is very near said wire.  
   
   
       35 . The papermaking machine as set forth in  claim 34 , wherein the fringe of the tip opening of said steam box is provided with seal means for sealing said steam box.  
   
   
       36 . The papermaking machine as set forth in  claim 35 , wherein said seal means is a seal member which is attached to the fringe of the tip opening of said steam box and abuts said wire.  
   
   
       37 . The papermaking machine as set forth in  claim 35 , wherein said seal means is a gas jet device which is provided upstream in the traveling direction of said paper stock layer relative to the fringe of the tip opening of said steam box, and suppresses incursion of wake of said paper stock layer into said steam box by jetting gas.  
   
   
       38 . The papermaking machine as set forth in  claim 34 , further comprising a suction box for suctioning steam jetted from said steam box toward a side opposite to said steam box across said paper stock layer.  
   
   
       39 . The papermaking machine as set forth in  claim 38 , wherein a downstream end of said suction box in the traveling direction of said paper stock layer is arranged downstream relative to a downstream end of said steam box in the traveling direction of said paper stock layer.  
   
   
       40 . The papermaking machine as set forth in  claim 38 , further comprising another suction box besides to said suction box, arranged on said side opposite to said steam box across said paper stock layer and downstream in the traveling direction of said paper stock layer.  
   
   
       41 . The papermaking machine as set forth in  claim 39 , wherein suction force of the downstream suction box is set larger than that of the upstream suction box.  
   
   
       42 . The papermaking machine as set forth in  claim 38 , wherein said steam box is divided into a plurality of parts in the width direction of said paper stock layer and said suction box is divided into a plurality of parts so as to correspond to the divided parts of said steam box, and wherein a jet of steam and suction of steam are adjustable for each of the divided parts of said steam box and said suction box.  
   
   
       43 . The papermaking machine as set forth in  claim 31 , wherein said steam supplied by said steam type heating means heats said paper stock layer by acting on said paper stock layer as a collision jet.  
   
   
       44 . The papermaking machine as set forth in  claim 31 , further comprising control means for automatically adjusting said adjustment means.  
   
   
       45 . The papermaking machine as set forth in  claim 44 , further comprising: 
 stock concentration detecting means, provided in the vicinity of said steam type heating means, for detecting a stock concentration of said paper stock layer when passing through said steam type heating means;    wherein said control means controls the supply of steam performed by said steam type heating means, on the basis of information detected by said stock concentration detecting means, so that said paper stock layer is raised to said target temperature.    
   
   
       46 . The papermaking machine as set forth in  claim 45 , wherein said heating means comprises first heating means for performing heating on one side of said paper stock layer, and second heating means for performing heating on the other side of said paper stock layer.