Method for creating a fibrous substance suspension used for producing a tissue web or hygiene web

Abstract

Method and device for producing a fibrous suspension used for producing a tissue web or hygiene web. The fibers contained in the fibrous suspension are, in an online process, directly loaded with a filler in the tissue preparation line by a chemical precipitation reaction.

1 - 34 . (canceled)  
   
   
       35 . A method for creating a fibrous suspension for producing a tissue web or a hygiene web, comprising: 
 directly loading fibers contained in a fibrous suspension with a filler through a chemical precipitation reaction in an online process in a tissue material preparation line.    
   
   
       36 . The method of  claim 35 , wherein crystalline precipitation product particles are produced in the online process.  
   
   
       37 . The method of  claim 36 , wherein the crystalline precipitation product particles comprise calcium carbonate.  
   
   
       38 . The method of  claim 35 , wherein the loading of the fibers comprises adding at least one of calcium oxide and calcium hydroxide; and 
 the chemical precipitation reaction is initiated through carbon dioxide or a gas containing carbon dioxide.    
   
   
       39 . The method of  claim 38 , wherein crystalline precipitation product particles are produced without the introduction of mixing energy.  
   
   
       40 . The method of  claim 35 , further comprising feeding the fibrous suspension to a treatment unit comprising at least one of a fluffer, refiner, and disperser.  
   
   
       41 . The method of  claim 40 , wherein the loading of the fibers occurs before feeding the fibrous suspension to the treatment unit.  
   
   
       42 . The method of  claim 40 , wherein the loading of the fibers occurs after feeding the fibrous suspension to the treatment unit.  
   
   
       43 . The method of  claim 40 , wherein the treatment unit is usable as a reactor for the chemical precipitation reaction.  
   
   
       44 . The method of  claim 38 , wherein calcium hydroxide in liquid form is added to the fibrous suspension.  
   
   
       45 . The method of  claim 38 , wherein calcium hydroxide in dry form is added to the fibrous suspension.  
   
   
       46 . The method of  claim 40 , wherein the fibrous suspension has a stock consistency in the range of approximately 5% to approximately 60% during feeding.  
   
   
       47 . The method of  claim 46 , further comprising adding calcium hydroxide to the suspension before the feeding of the fibrous suspension to the treatment unit.  
   
   
       48 . The method of  claim 47 , wherein the fibrous suspension has a stock consistency in the range of approximately 15% to approximately 35% during feeding.  
   
   
       49 . The method of  claim 38 , wherein the carbon dioxide or the gas containing carbon dioxide is added at a temperature in the range of approximately −15° C. to approximately 120° C.  
   
   
       50 . The method of  claim 48 , wherein the carbon dioxide or the gas containing carbon dioxide is added at a temperature in the range of approximately 20° C. to approximately 90° C.  
   
   
       51 . The method of  claim 35 , wherein crystalline precipitation product particles with a rhombohedral form are produced in the online process.  
   
   
       52 . The method of  claim 35 , wherein crystalline precipitation product particles with a scalenohedral form are produced in the online process.  
   
   
       53 . The method of  claim 35 , wherein spherical crystalline precipitation product particles are produced in the online process.  
   
   
       54 . The method of  claim 40 , wherein the treatment unit comprises a disperger with two plates disposed opposite to one another and rotating relative to one another.  
   
   
       55 . The method of  claim 53 , wherein the two plates comprise a rotor and stator.  
   
   
       56 . The method of  claim 54 , wherein crystalline precipitation product particles are produced in the online process; and 
 the dimensions of the crystalline precipitation product particles are influenced in the treatment unit.    
   
   
       57 . The method of  claim 36 , wherein maximum dimensions of the crystalline precipitation product particles are in the range of approximately 0.05 μm to approximately 5 μm.  
   
   
       58 . The method of  claim 56 , wherein the maximum dimensions of the crystalline precipitation product particles are in the range of approximately 0.3 μm to approximately 2.5 μm.  
   
   
       59 . The method of  claim 35 , wherein crystalline precipitation product particles with a rhombohedral form are produced in the online process, said particles having an edge length of approximately 0.05 μm to approximately 2 μm.  
   
   
       60 . The method of  claim 35 , wherein crystalline precipitation product particles with a scalenohedral form are produced in the online process, said particles having an edge length of approximately 0.05 μm to approximately 2 μm and a diameter of approximately 0.01 μm to approximately 0.5 μm  
   
   
       61 . The method of  claim 53 , further comprising: 
 diluting the fibrous suspension with water in a radially outer area of the treatment unit.    
   
   
       62 . The method of  claim 40 , wherein the fibrous suspension guided through the treatment unit has a stock consistency of approximately 0.1% to approximately 50%.  
   
   
       63 . The method of  claim 61 , wherein the fibrous suspension guided through the treatment unit has a stock consistency of approximately 5% to approximately 35%.  
   
   
       64 . The method of  claim 35 , further comprising: 
 maintaining a substantially constant supply of carbon dioxide or a gas containing carbon dioxide into the fibrous suspension.    
   
   
       65 . The method of  claim 35 , further comprising: 
 adding carbon dioxide or a gas containing carbon dioxide to the fibrous suspension at a pressure of approximately 0.1 bar to approximately 6 bar.    
   
   
       66 . The method of  claim 64 , further comprising: 
 adding the carbon dioxide or the gas containing carbon dioxide at a pressure of approximately 0.5 bar to approximately 3 bar.    
   
   
       67 . The method of  claim 35 , further comprising: 
 regulating or controlling a pH value of the fibrous suspension by regulating or controlling a supply of carbon dioxide, such that substantially all base materials of the chemical precipitation reaction are converted to reaction products.    
   
   
       68 . The method of  claim 66 , further comprising: 
 establishing the pH value in a range of approximately 6 to approximately 10.    
   
   
       69 . The method of  claim 67 , further comprising: 
 establishing the pH value in a range of approximately 7 to approximately 8.5.    
   
   
       70 . The method of  claim 66 , further comprising: 
 introducing energy for the chemical precipitation reaction in a range of approximately 0.3 kWh/t to approximately 8 kWh/t.    
   
   
       71 . The method of  claim 69 , wherein the energy is in a range of approximately 0.5 kWh/t to approximately 4 kWh/t.  
   
   
       72 . The method of  claim 35 , further comprising: 
 adding dilution water to the fibrous suspension to obtain a diluted fibrous suspension with a stock consistency of approximately 0.1% to approximately 16%.    
   
   
       73 . The method of  claim 71 , wherein the diluted fibrous suspension has a stock consistency of approximately 2% to approximately 6%.  
   
   
       74 . The method of  claim 53 , wherein a radially outer edge portion of a rotating portion of the treatment unit has a circumferential speed of approximately 20 m/s to approximately 100 m/s.  
   
   
       75 . The method of  claim 73 , wherein the circumferential speed is approximately 40 m/s to approximately 60 m/s.  
   
   
       76 . The method of  claim 53 , wherein the two plates are separated by a gap of approximately 0.5 mm to approximately 100 mm.  
   
   
       77 . The method of  claim 75 , wherein the gap is approximately 25 mm to approximately 75 mm.  
   
   
       78 . The method of  claim 53 , wherein the two plates have a diameter of approximately 0.5 m to approximately 2 m.  
   
   
       79 . The method of  claim 35 , wherein the chemical precipitation reaction has a reaction time of approximately 0.01 minute to approximately 1 minute.  
   
   
       80 . The method of  claim 35 , wherein the chemical precipitation reaction has a reaction time of approximately 0.1 seconds to approximately 10 seconds.  
   
   
       81 . The method of  claim 37 , further comprising: 
 washing out free calcium carbonate not deposited on or in the fibers.    
   
   
       82 . A tissue product made from the fibrous suspension according to  claim 35.