Sanitary Thin Paper and Process for Producing the Same

Abstract

A sanitary thin paper is provided which has an excellent pliability together with an excellent smoothness. Such a paper can be obtained by incorporating a fatty acid ester-based compound and a fatty acid amide-based compound internally and/or externally.

1 . A sanitary thin paper which employs a pulp as a raw material and contains a fatty acid ester-based compound and a fatty acid amide-based compound and also contains a polyester-based compound.  
   
   
       2 . The sanitary thin paper according to  claim 1  wherein the softener components including said fatty acid ester-based compound and said fatty acid amide-based compound are contained in an amount, on dried mass basis, of 0.002 to 10 parts by mass per 100 parts by mass of said pulp raw material.  
   
   
       3 . The sanitary thin paper according to  claim 1  wherein said fatty acid ester-based compound is contained internally and said fatty acid amide-based compound is contained internally and/or externally, and wherein a polyester-based compound is contained, and said polyester-based compound is contained externally.  
   
   
       4 . The sanitary thin paper according to  claim 3  wherein a polyester-based compound represented by General Formula (1):  
     
       
         
         
             
             
         
       
     
     wherein R 1  is HO— or HO(R 2 O)a-, R 2  is an alkylene group having 2 to 3 carbon atoms, only a single type of R 2 O may be present or two or more types of R 2 O are attached randomly or as a block, “a” is 1 to 200, all “a”s may be same or different in an identical molecule, b is 2 to 100, and R 3  is a hydrogen atom or a group represented by General Formula (2):  
     
       
         
         
             
             
         
       
     
     is contained as said polyester-based compound.  
   
   
       5 . The sanitary thin paper according to  claim 3  or  claim 4  wherein said polyester-based compound is added in an amount, on dried mass basis, of 0.05 to 30.0% by mass based on said pulp raw material.  
   
   
       6 . The sanitary thin paper according to  claim 1  wherein the basis weight (gsm) per 1 ply is 10 to 35 g/m 2 .  
   
   
       7 . The sanitary thin paper according to  claim 1  wherein a crepe is formed at a paper making stage, and the crepe is formed in such a shape that the apex distance in the machine direction of the crepe is 0.1 mm or less, and the length in the width direction of the crepe is 0.5 mm or less.  
   
   
       8 . The sanitary thin paper according to  claim 7  wherein the number of the pulp fibers each of which has a distance of 1 μm or more from the adjacent pulp fiber in the section in the width direction of the paper is 50% or more of the number of all pulp fibers.  
   
   
       9 . The sanitary thin paper according to  claim 7  or  claim 8  wherein the area ratio of the voids excluding the area occupied by the pulp fibers in the width direction of the paper is 50% or more.  
   
   
       10 . A process for producing a sanitary thin paper comprising adding a fatty acid ester-based compound and a fatty acid amide-based compound to a wet paper as a pulp raw material internally, and then adding a polyester-based compound to said wet paper externally on-line.  
   
   
       11 . A process for producing a sanitary thin paper comprising adding a fatty acid ester-based compound and a fatty acid amide-based compound to a wet paper as a pulp raw material internally and/or externally, and then adding externally on line a polyester-based compound to said pulp wet paper or a dry paper obtained by drying the same.