Process of Producing a Cellulosic Fibre Web

Abstract

The present invention relates to a process of producing a cellulosic fibre web comprising a) providing a cellulosic suspension to which a debonder system can be added, b) dewatering the cellulosic suspension and forming a cellulosic fibre web, and c) applying a smectite clay to said cellulosic fibre web with or without adding a polymer in an amount from about 0.01 to about 2 kg/t dry cellulosic fibres. The invention also relates to a web obtainable by the process.

1 . A process of producing a cellulosic fibre web comprising
 a) providing a cellulosic suspension   b) dewatering the cellulosic suspension and forming a cellulosic fibre web   c) applying a smectite clay in an amount from about 0.01 to about 2 kg/t dry cellulosic fibres to said cellulosic fibre web,   wherein no polymer is added to the formed cellulosic fibre web.   
     
     
         2 . A process of producing a cellulosic fibre web comprising
 a) providing a cellulosic suspension and adding a debonder system to the cellulosic suspension   b) dewatering the cellulosic suspension and forming a cellulosic fibre web   c) applying a smectite clay in an amount from about 0.01 to about 2 kg/t dry cellulosic fibres to the formed cellulosic fibre web.   
     
     
         3 . The process according to  claim 1 , wherein a debonder system is added to the cellulosic suspension. 
     
     
         4 . The process according to  claim 1 , wherein a polymer is added to the cellulosic suspension. 
     
     
         5 . The process according to  claim 1 , wherein the smectite clay is added in an amount from about 0.1 to about 1 kg/ton dry cellulosic fibres to the formed web. 
     
     
         6 . The process according to  claim 1 , wherein the smectite clay is sprayed on the web. 
     
     
         7 . The process according to  claim 2 , wherein the debonder system comprises
 (i) an oil, fat or wax,   (ii) at least one non-ionic surfactant, and   (iii) at least one anionic surfactant.   
     
     
         8 . The process according to  claim 2 , wherein the debonder system comprises a quaternary ammonium surfactant. 
     
     
         9 . The process according to  claim 2 , wherein the weight ratio of the debonder system to smectite clay added to the web ranges from about 1:50 to about 100:1. 
     
     
         10 . The process according to  claim 2 , wherein the smectite clay is laponite and/or bentonite. 
     
     
         11 . The process according to  claim 2 , wherein the static potential of the cellulosic fibre web is lower than 10 kV. 
     
     
         12 . The process according  claim 2 , wherein the defiberization energy of the cellulosic fibre web is lower than 120 kJ/kg. 
     
     
         13 . The process according to  claim 2 , wherein the cellulosic fibre web is further processed to produce air-laid paper, tissue or fluff. 
     
     
         14 . A cellulosic fibre web obtainable by the process as claimed in  claim 2 . 
     
     
         15 . A cellulosic fibre web comprising smectite clay in an amount from about 0.25 to about 0.75 kg/ton dry cellulosic fibres wherein the static potential is lower than 5 kV. 
     
     
         16 . The process according to  claim 2 , wherein a polymer is added to the cellulosic suspension. 
     
     
         17 . The process according to  claim 3 , wherein the debonder system comprises
 (i) an oil, fat or wax,   (ii) at least one non-ionic surfactant, and   (iii) at least one anionic surfactant.   
     
     
         18 . The process according to  claim 2 , wherein the debonder system comprises a quaternary ammonium surfactant. 
     
     
         19 . The process according to  claim 3 , wherein the weight ratio of the debonder system to smectite clay added to the web ranges from about 1:50 to about 100:1. 
     
     
         20 . The process according to  claim 1 , wherein the smectite clay is laponite and/or bentonite.