Sanitary thin paper and method of manufacturing the thin paper, storage box for sanitary thin paper, storage body for sanitary thin paper, inter folder, and device and method for transfer of storage body for sanitary thin paper

Abstract

The present invention aims at preventing sanitary tissue paper from being torn when it is removed. The purpose is accomplished by sanitary tissue paper of single-ply or double-plies, characterized in that said paper has a lateral tensile strength on a dry condition of 32 N/m or more, a longitudinal tensile strength on a wet direction of 32 N/m or more, and a longitudinal tensile strength on a dry condition which is 2.5 to 3.5 times higher than the lateral tensile strength on a dry condition.

What is claimed is:  
     
         1 . Sanitary tissue paper of single-ply or double-plies, characterized in that said paper has a lateral tensile strength on a dry condition of 32 N/m or more, a longitudinal tensile strength on a wet direction of 32 N/m or more, and a longitudinal tensile strength on a dry condition which is 2.5 to 3.5 times higher than the lateral tensile strength on a dry condition.  
     
     
         2 . Sanitary tissue paper as defined in  claim 1  in which said paper has a basis weight of one sheet which is 11 g/m 2  or less, a density of 0.18 to 0.21 g/cm 3  and a thickness of 50 to 60 μm.  
     
     
         3 . Sanitary tissue paper as defined in  claim 1  or  2  in which NBKP and LBKP is mainly made of raw material pulp, the ratio of NBKP to LBKP being 10:90 to 70:30.  
     
     
         4 . A method of manufacturing the sanitary tissue paper as set forth in any one of  claims 1  to  3  characterized in that said paper is made at a ratio of paper making water flow speed/wire speed (J/W ratio) which is 0.92 to 1.00.  
     
     
         5 . A carton box for sanitary tissue paper characterized in that a window formed in the top face of the carton is covered on the inner side thereof with a sheet having a slit through which a number of sheets of folded and stacked sanitary tissue paper are sequentially pulled out, and in that the effective length of said slit is 70 to 90% of the length of said sanitary tissue paper in a lateral direction.  
     
     
         6 . A package for sanitary tissue paper characterized in that said package has a window formed in the top face thereof, which is covered on the inner side thereof with a sheet having a slit through which a number of folded and stacked sheets of sanitary paper in double-plies are sequentially pulled out, characterized in that the effective length of said slit is 72 to 90% of the length of said sanitary tissue paper sheet in a lateral direction, and 
 in that the basis weight of said sanitary tissue paper is 10 to 22 g/m 2  and the lateral tensile strength on a wet condition is 32 N/m or more.    
     
     
         7 . A package for sanitary tissue paper as defined in  claim 6  in which the longitudinal tensile strength of the sanitary tissue paper is 1.5 to 4 times of the lateral tensile strength thereof.  
     
     
         8 . A package for sanitary tissue paper as defined in  claim 6  or  7  in which the number of crepes of the sanitary tissue paper is 30 to 55/cm, and the sanitary tissue paper sheets are packed so that the apparent density at the phase of product is 0.10 to 0.20 g/cm 3 .  
     
     
         9 . A package for sanitary tissue paper as defined in  claim 6  or  7  in which the rate of crepes of the sanitary tissue paper is 10 to 28%, the longitudinal elongation is 7 to 20%, and the sanitary tissue paper sheets are packed so that the apparent density at the phase of product is 0.10 to 0.20 g/cm 3 .  
     
     
         10 . A package for sanitary tissue paper characterized in that said package has a window formed in the top face thereof, which is covered on the inner side thereof with a sheet having a slit through which a number of folded and stacked sheets of sanitary paper in double-plies are sequentially pulled out, characterized in that said sanitary tissue paper sheets are packed in said carton box so that the longitudinal tensile strength of said sanitary tissue paper on a dry condition is 160 N/m or less, the longitudinal elongation is 7 to 20% and the recovery rate of the.sanitary tissue paper bundle after it was left in a drier at 60° C. is 20% or less.  
     
     
         11 . An interfolder for stacking a plurality of continuous webs while folding them by means of a folding board bank comprising a plurality of juxtaposed folding boards, characterized in that said interfolder is provided with movable air blowing means for blowing air toward at least said folding boards while said means moves in the vicinity of said folding boards.  
     
     
         12 . An interfolder as defined in  claim 11  which is provided with stationary air blowing means for blowing air toward said folding boards in a predetermined direction together with said movable air blowing means.  
     
     
         13 . An interfolder as defined in  claim 11  or  12  in which said movable air blowing means comprises guide rails secured along said folding boards in a juxtaposing direction; a base unit which is guided on and along the guide rails for reciprocating; a drive for driving said base unit for reciprocating it; a fan which is mounted on said base unit; an air duct which is connected to the air exit of said fan and has a communicating portion which passes the vicinity of said folding board bank in a vertical direction and an air blowing slits which are formed in the communicating portion of said air duct in a vertical direction, in the height range corresponding to at least said folding boards.  
     
     
         14 . An interfolder as set forth in any one of  claims 11  to  13  in which said movable air blowing means is configured to blow air in the range covering adjacent plural folding boards while it reciprocally moves in a juxtaposing direction of said folding boards.  
     
     
         15 . An interfolder which is configured to stack a plurality of continuous webs in plural-plies while folding them, characterized in that said interfolder is provided with emboss bonding means for bonding plies to each other by embossing paper roll prior to said folding.  
     
     
         16 . An interfolder including a paper roll support and a folding mechanism, in which a paper roll comprising a plurality of sheets of plies, which is preliminarily formed with slits which match with the width of products is mounted on said paper roll support, and in which plurality of continuous webs dispensed from the paper roll are guided to said folding mechanism so that they are stacked while being folded, characterized in that said interfolder is provided in a guide path of a continuous web leading from said paper roll support to said folding mechanism with an emboss bonding apparatus including a pair of rolls at least one of which having embossing recesses on the outer periphery thereof, and in that 
 the plies are bonded to each other by subjecting said continuous web to an emboss working by means of said emboss bonding apparatus prior to said folding.    
     
     
         17 . A facility for manufacturing sanitary tissue paper including a ply-machine for manufacturing secondary paper rolls by rolling primary continuous webs dispensed from a plurality of primary paper rolls while overlapping them and slitting them to match the width of products, and 
 an interfolder on which said secondary paper rolls which have been produced by the ply-machine are mounted, for stacking the plurality of secondary continuous webs having the same width as that of the products, dispensed from the ply-machine while folding them,    characterized in that said interfolder is provided with emboss bonding means for embossing said secondary continuous web to bond them to each other prior to said folding.    
     
     
         18 . A sanitary tissue paper package characterized in that it comprises a carbon box having a width of 233 to 253 mm, a depth of 110 to 130 mm and a height less than 60 mm; and 
 in that a stack of sanitary tissue paper sheets in said carton box, which is folded and packed so that it has a width of 220 to 240 mm and a height of 40 to 60 mm,    in that the spacing between the inner side of said carton box and the sanitary tissue paper stack is such that the total spacing on both sides in a width direction is 10 to 16 mm, the total spacing on both sides in a depth direction is 0 to 3 mm and the total spacing on-both sides in a height direction is substantially zero;    in that the package has a weight of 150 to 250 g; and    in that the gravity center is located in the range of ±10 mm, ±10 mm and ±5 mm relative to the center positions of the width, depth and height, respectively.    
     
     
         19 . A package for sanitary tissue paper in which the dynamic and static frictional coefficients on the front or rear face are 0.15 to 0.25 and 0.18 to 0.33, respectively.  
     
     
         20 . An apparatus for conveying sanitary tissue paper packages characterized in that said apparatus is provided with a transfer apparatus for transferring the sanitary tissue paper packages on which they are placed thereon and an attitude restriction means which moves along the sanitary tissue paper packages placed on said transfer apparatus at a speed in the range of ±10% relative to the transfer speed of the transfer apparatus.  
     
     
         21 . An apparatus for sanitary tissue paper packages as defined in  claim 20  in which said transfer apparatus is configured to transfer said sanitary tissue paper packages in a height direction while assuming an attitude with the front or rear face side down.  
     
     
         22 . An apparatus for conveying sanitary tissue paper packages as defined in claims  20  or  21  in which said attitude restriction member is provided above and in a spaced relationship with said transfer apparatus for transferring said sanitary tissue paper packages while they are located between said attitude restriction member and said transfer apparatus.  
     
     
         23 . An apparatus for conveying sanitary tissue paper packages including an upstream transfer apparatus for transferring said sanitary tissue paper packages while they are placed thereon, and a downstream transfer apparatus on which said sanitary tissue paper packages transferred from said upstream transfer apparatus are placed for transferring said sanitary tissue paper packages at a speed which is lower or higher than that of said upstream transfer apparatus while said sanitary tissue paper packages are placed, 
 characterized in that said conveying apparatus further includes    an upstream attitude restriction member which moves from a predetermined position to said transfer position along the sanitary tissue paper packages on said upstream transfer apparatus at a speed in the range of ±10 t of that of said upstream transfer apparatus; and    an downstream attitude restriction member which moves from a predetermined position to said transfer position along the sanitary tissue paper packages on said downstream transfer apparatus at a speed in the range of ±10% relative to that of said downstream transfer apparatus.    
     
     
         24 . An apparatus for conveying sanitary tissue paper packages as defined in  claim 23  in which 
 said upstream transfer apparatus is a package erecting and feeding apparatus for receiving the sanitary tissue paper packages which have been fed in a depth direction with its bottom face side down and for feeding them in a height direction with its front or rear face side down; and  
 said downstream transfer apparatus is a belt conveyor for receiving sanitary tissue paper fed from said upstream transfer apparatus while keeping their attitudes on feeding and for feeding said sanitary tissue paper packages in a height direction with its front or rear face side down.  
 
     
     
         25 . An apparatus for conveying sanitary tissue paper packages as defined in  claim 23  or  24  in which said upstream restriction member is provided on each of the both sides of said upstream transfer apparatus; 
 and said downstream attitude restriction member is provided on each of the both sides of said downstream transfer apparatus;  
 the spacing between said upstream attitude restriction members is constant in a feeding direction; and  
 the spacing between said downstream attitude restriction members becomes narrower as they approach toward downstream side.  
 
     
     
         26 . An apparatus for conveying sanitary tissue paper packages as defined in any one of  claims 20  to  25 , which is configured to transfer said sanitary tissue paper packages having a height which is less than 6 cm.  
     
     
         27 . An apparatus for conveying sanitary tissue paper packages as defined in any one of  claims 20  to  26  in which said attitude restriction member is configured to move at a speed in the range of ±5% of that of said transfer apparatus.  
     
     
         28 . A method of conveying sanitary tissue paper packages in a placed condition, characterized in that 
 said attitude restriction member is moved along the sanitary tissue paper packages on said transfer apparatus at a speed in the range of ±10% of that of said transfer apparatus.    
     
     
         29 . A method of decelerating or accelerating sanitary tissue paper packages by transferring said sanitary tissue paper packages while keeping their placed positions and by transferring said sanitary tissue paper packages from an upstream transfer apparatus to a downstream transfer apparatus which moves said sanitary tissue paper packages at a speed which is higher or lower than that of said downstream transfer apparatus, characterized in that 
 said upstream attitude restriction member is moved from a predetermined position to said transfer position along said sanitary tissue paper packages on said upstream transfer apparatus at a speed in the range of ±10% of that of said upstream transfer apparatus and    said downstream attitude restriction member is moved from a predetermined position to said transfer position along said sanitary tissue paper packages on said downstream transfer apparatus at a speed in the range of ±10% of that of said downstream transfer apparatus.    
     
     
         30 . A method of conveying sanitary tissue paper packages for controlling the moving speed of a transfer face when sanitary tissue paper packages having a height not higher than 6 cm are placed on said transfer face of a transfer apparatus in an erect position with their front or rear face side down and are moved while keeping their placed attitude by moving said transfer face, characterized in that the moving speed of said transfer face is changed at a rate of 0.01 to 1.00 m/s 2 .  
     
     
         31 . A method of conveying sanitary tissue paper packages on a package processing line which is configured to place sanitary tissue paper packages having a height not higher than 6 cm on a transfer face of a transfer apparatus in an erect attitude with their front or rear face side down and to move said sanitary tissue paper packages while keeping their placed attitude by moving said transfer face, characterized in that 
 the moving speed of said transfer face is increased from 0 m/minute to 35 m/minute at a rate of 0.01 to 1.00 m/s 2  at the beginning of the operation of said line;    then a normal operation is conducted while the speed of 35 m/minute or more is kept and    the moving speed of the transfer face is decreased from the speed of 35 m/minute or higher on the normal operation to 0 m/minute at a rate of 0.01 to 1.00 m/s 2  until the line operation is stopped.