Toilet roll

Abstract

To provide a toilet roll that even when plies to be laminated are bonded with water, is less likely to be torn when bonded, whose plies are less likely to peel off when used, and that has a good tactile feel.SOLUTION: A toilet roll formed by winding two or three plies of toilet paper with an embossed pattern into a roll, the toilet paper is characterized in that the two or three plies are bonded with water, and a basis weight of the toilet paper is 32 g / m2 or more and 44 g / m2 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a toilet roll comprising two or three embossed plies of water-bonded toilet paper. [Background technology]

[0002] Two-ply toilet paper is sold that has a decorative embossing on the front side and a micro-embossing on the back side, and the joints are further bonded with glue (Patent Document 1). However, toilet paper in which the laminated plies are bonded with glue is stiff and feels unpleasant to the touch because of the use of glue.

[0003] Therefore, if water is used instead of glue, the texture becomes good, but the adhesion between the plies decreases and the plies become more likely to peel off. If the amount of water applied is increased, the adhesion between the plies becomes good, but the toilet paper becomes damp, the paper becomes more likely to tear, and the paper becomes stiff when the water dries. Thus, with toilet paper that does not use glue but uses water to bond the plies, it is difficult to prevent plies from peeling off and to improve the texture. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4180263 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a toilet roll that is unlikely to break when bonded, unlikely to peel off during use, and has a pleasant feel, even when the laminated plies are bonded with water. [Means for solving the problem]

[0006] The inventors conducted extensive research and found that in a toilet roll made by winding up two or three plies of toilet paper with an embossed pattern into a roll, by bonding the plies with water and setting the basis weight of the toilet paper within a predetermined numerical range, it is possible to obtain a toilet roll that is difficult to break when bonded, difficult to peel off during use, and has a good feel, and thus completed the present invention. That is, the present invention provides the following.

[0007] (1) The first aspect of the present invention is a toilet roll having two or three plies of toilet paper with an embossed pattern wound into a roll, the two or three plies being bonded with water, and the basis weight of the toilet paper is 32 g / m 2 More than 44g / m 2 The toilet roll is characterized in that:

[0008] (2) The second aspect of the present invention is the toilet roll according to (1), wherein the tensile strength in the machine direction when dry based on JIS-P8113 of the toilet paper is DMDT, the tensile strength in the cross direction when dry is DCDT, and the square root of the product of DMDT and DCDT is (DMDT x DCDT). 1 / 2 When DGMT is taken as DGMT, the value expressed by (DGMT / basis weight of the toilet paper×1000) is 42 or more and 105 or less.

[0009] (3) A third aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the content of the temporary wet strength agent in the toilet paper is 0.005% or more and 0.200% or less.

[0010] (4) A fourth aspect of the present invention is the toilet roll according to (1) or (2), The toilet paper includes a first embossment applied to the ply on the front side of the toilet roll and a second embossment applied to the ply on the back side of the toilet roll, and is characterized in that the area ratio of the first embossment in the toilet paper is 2% or more and 15% or less. Effect of the Invention

[0011] According to the present invention, it is possible to provide a toilet roll that is resistant to tearing when bonded, resistant to peeling of the plies during use, and has a pleasant feel, even when the laminated plies are bonded with water. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing the appearance of a toilet roll according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing an example of an embossment applied to a toilet paper according to one embodiment of the present invention. [Diagram 3] FIG. 1 is a diagram showing a height profile on an XY plane taken by a microscope using shading. [Figure 4] FIG. 1 is a graph showing a height profile on an XY plane obtained by a microscope. [Diagram 5] FIG. 13 is a diagram showing how to determine the depth of embossing imparted to toilet paper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment for carrying out the present invention (hereinafter, simply referred to as "the present embodiment") will be described in detail. The following embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0014] In the drawings, the same elements are given the same reference numerals, and duplicated explanations are omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown in the drawings.

[0015] <Toilet roll> Fig. 1 is a perspective view showing the appearance of a toilet roll 1 according to one embodiment of the present invention. The toilet roll 1 according to one embodiment of the present invention is a toilet roll 1 formed by winding up a roll of toilet paper 1x, which is made by laminating two or three plies of sheets having embossings 10, by bonding them with water. The number of plies to be laminated is preferably two. The toilet paper 1x (hereinafter also simply referred to as the sheet) is preferably perforated in the width direction at approximately equal intervals in the machine direction (not shown).

[0016] Also, as shown in FIG. 1, the surface of the toilet paper 1x that faces the outside of the roll is referred to as the roll surface 1a (the surface of the toilet paper 1x), the surface that faces the center of the roll is referred to as the roll back surface 1b (the back surface of the toilet paper 1x), and the outermost end of the rolled up toilet paper 1x is referred to as the outermost roll edge 1e of the toilet paper 1x.

[0017] (Volume length) The lower limit of the winding length of the toilet roll 1 is preferably 30 m or more, more preferably 35 m or more, and even more preferably 40 m or more. The upper limit is preferably 60 m or less, more preferably 55 m or less, and even more preferably 50 m or less. By keeping the length within the above range, ply peeling is less likely to occur when the winding diameter is within a certain range.

[0018] (Roll diameter) The lower limit of the roll diameter DR of the toilet roll 1 is preferably 115 mm or more, more preferably 120 mm or more, and even more preferably 125 mm or more. The upper limit is preferably 145 mm or less, more preferably 140 mm or less, and even more preferably 135 mm or less. By setting both the roll length and the roll diameter DR within the above numerical ranges, a toilet roll 1 of an appropriate size can be obtained. By setting them within the above ranges, ply peeling is less likely to occur when the roll length is within a certain range.

[0019] To determine the roll length, measure the length of 10 sheets of toilet paper 1x between the perforations of toilet roll 1. Then, measure the number of sheets of toilet paper 1x on toilet roll 1, and calculate the roll length proportionally from the length of 10 sheets and the number of sheets of toilet paper 1x. For example, if the length of 10 sheets is 1.80m and there are 200 sheets of toilet paper 1x, then the roll length is 1.80m x (200 / 10) = 36m. If toilet roll 1 does not have perforations, the roll length can be measured by actually measuring it.

[0020] The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The roll length and roll diameter DR are measured by measuring four toilet rolls 1 and averaging the measurement results.

[0021] (Seat length) Furthermore, the lower limit of the length between the perforations (the sheet length of the toilet paper 1x) is preferably 80 mm or more, more preferably 85 mm or more, and even more preferably 90 mm or more, and the upper limit is preferably 250 mm or less, more preferably 200 mm or less, and even more preferably 150 mm or less.

[0022] (sheet width) Furthermore, the lower limit of the sheet width of the toilet paper 1x is preferably 105 mm or more, more preferably 108 mm or more, and even more preferably 111 mm or more, and the upper limit is preferably 120 mm or less, more preferably 118 mm or less, and even more preferably 116 mm or less.

[0023] By having the sheet length and sheet width within the above numerical ranges, when using the toilet roll 1 of the present application, the area used is appropriate, making it suitable for use in a warm water washing toilet seat.

[0024] (Roll weight) The lower limit of the roll mass of the toilet roll 1 is preferably 130 g or more, more preferably 150 g or more, and even more preferably 170 g or more. The upper limit is preferably 240 g or less, more preferably 220 g or less, and even more preferably 200 g or less. By setting the roll mass within the above numerical range, the winding length and winding diameter DR are also adjusted as a result, and the toilet roll 1 can be made to an appropriate size, making it difficult for the ply to peel off. Note that the roll mass within the above numerical range is the mass of one roll per 114 mm of roll width not including the paper tube (core) of the toilet roll 1, and if the roll width is not 114 mm, it is converted to the mass per 114 mm by proportional calculation.

[0025] (Paper tube outer diameter) The cardboard tube outer diameter is the outer diameter of the core of the toilet roll 1 of the present invention. The lower limit of the cardboard tube outer diameter DI is preferably 25 mm or more, more preferably 30 mm or more, and even more preferably 35 mm or more. The upper limit is preferably 55 mm or less, more preferably 50 mm or less, and even more preferably 45 mm or less. By setting the cardboard tube outer diameter DI within the above numerical range, the winding length and winding diameter DR can also be adjusted as a result, making it possible to produce a toilet roll 1 of an appropriate size, and making it difficult for the ply to peel off.

[0026] The outer diameter DI of the paper core is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The paper cores of four toilet rolls 1 are measured, and the measurement results are averaged.

[0027] (Roll density) The roll density of toilet roll 1 has a lower limit of 0.10 g / cm 3 More than 0.11 g / cm is preferable. 3 More preferably, 0.12 g / cm3 More preferably, the upper limit is 0.20 g / cm. 3 Less than 0.18 g / cm is preferred. 3 Less than 0.16 g / cm is more preferable. 3 The following is even more preferable. By having the roll density within the above range, the toilet roll 1 has an appropriate softness as a roll product, is excellent in feel when used, and has a luxurious feel. In addition, the ply is less likely to peel off.

[0028] The roll density is expressed as (roll mass) ÷ (roll volume). The roll mass is the mass of toilet roll 1 per 114 mm of roll width. The roll volume is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter DR) part} - (cross-sectional area of ​​the paper core outer diameter DI part)] x roll width (converted per 114 mm). For example, if the roll mass (excluding the paper core) per 114 mm of roll width is 162 g, the winding diameter DR is 127 mm, and the paper core outer diameter DI is 39 mm, the roll density = 0.124 g / cm 3 In addition, if the toilet roll 1 does not have a paper tube, the diameter of the center hole is the outer diameter DI of the paper tube.

[0029] (winding density) Furthermore, the winding density of the toilet roll 1 has a lower limit of 0.55 m / cm 2 More than 0.60m / cm is preferable. 2 More preferably, 0.65 m / cm or more 2 More preferably, the upper limit is 0.95 m / cm 2 Less than 0.90m / cm is preferable. 2 Less than 0.85m / cm is more preferable. 2 The following is even more preferable. By having the winding density within the above range, the toilet roll 1 has an appropriate softness as a roll product, is excellent in feel when used, and has a luxurious feel. In addition, the ply is less likely to peel off.

[0030] The winding density is expressed as (winding length x number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll's outer diameter (winding diameter DR) - (cross-sectional area of ​​the cardboard core's outer diameter DI)}. For example, in the case of a winding length of 39 m, 2 plies, winding diameter DR of 127 mm, and cardboard core outer diameter DI of 39 mm, the winding density = (39 m x 2) ÷ {3.14 x (127 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}=0.68m / cm 2 It becomes.

[0031] <Toilet paper> The base paper used in the toilet paper 1x according to one embodiment of the present invention may be made of 100% wood pulp by mass, and may also contain recycled paper pulp, non-wood pulp, deinked pulp, recycled paper from liquid beverage cartons, etc. However, from the viewpoint of quality, the content of pulp other than wood pulp, recycled paper, etc. is preferably 50% by mass or less, more preferably 30% by mass or less, even more preferably 10% by mass or less, and most preferably 0% by mass.

[0032] In order to obtain the target quality, the lower limit of the NBKP (softwood bleached kraft pulp) content is preferably 5% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass or more, and the upper limit is preferably 55% by mass or less, more preferably 45% by mass or less, and even more preferably 35% by mass or less.

[0033] The lower limit of the LBKP (bleached hardwood kraft pulp) content is preferably 45% by mass or more, more preferably 55% by mass or more, and even more preferably 65% ​​by mass or more, and the upper limit is preferably 95% by mass or less, more preferably 85% by mass or less, and even more preferably 80% by mass or less.

[0034] (Temporary wet strength agent) The toilet paper 1x according to one embodiment of the present invention contains a temporary wet strength agent to make it suitable for use in a warm water washing toilet seat. In this case, the content of the temporary wet strength agent is preferably 0.005% or more and 0.200% or less. If the content is less than 0.005%, the plies are easily torn when bonded together because they are bonded by water. If the content exceeds 0.200%, the toilet paper 1x becomes stiff and has a poor feel. The lower limit of the content of the temporary wet strength agent is more preferably 0.010% or more, and even more preferably 0.020% or more. The upper limit is more preferably 0.100% or less, and even more preferably 0.070% or less.

[0035] In this case, the content of temporary wet strength agents refers to the mass percentage of temporary wet strength agents (converted into solids (active ingredients)) relative to pulp fibers (bone dry). In addition to temporary wet strength agents, softeners, bulking agents, dyes, dispersants, dry strength agents, drainage improvers, pitch control agents, water absorption improvers, etc. can be used as additives to the paper stock depending on the required quality of the final product.

[0036] (Toilet paper basis weight) The basis weight of the toilet paper 1x according to one embodiment of the present invention is 32 g / m 2 More than 44g / m 2 The basis weight of one piece of toilet paper is 32 g / m 2 If the thickness is less than 44g / m, the plies will not adhere well to each other with water, and the plies will be prone to peeling. 2 If it exceeds this limit, too much water will adhere when it is glued with water, resulting in the toilet paper 1x having an inferior feel. The basis weight of toilet paper 1x has a minimum limit of 34 g / m 2 More than 36g / m is preferable. 2 More preferably, the upper limit is 42 g / m 2 Less than 40 g / m is preferable. 2 The following is more preferred:

[0037] In this specification, the basis weight of toilet paper 1x refers to the basis weight of 2 or 3 laminated plies, not the basis weight of 1 ply. The basis weight of toilet paper 1x is measured in accordance with JIS P 8124.

[0038] (paper thickness) The lower limit of the paper thickness of the toilet paper 1x according to one embodiment of the present invention is preferably 220 μm or more, more preferably 235 μm or more, and even more preferably 245 μm or more. The upper limit is preferably 315 μm or less, more preferably 295 μm or less, and even more preferably 280 μm or less. If the paper thickness is less than 220 μm, the plies are difficult to bond with water, and ply peeling is likely to occur. If the paper thickness exceeds 315 μm, too much water will adhere when bonding with water, resulting in the toilet paper 1x having an inferior feel.

[0039] The thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa, a gauge diameter of 30 mm, a sample is placed between the gauge and the measuring table, and the gauge is read when the gauge is lowered at a speed of 1 mm per second or less. If the toilet paper 1x is 2-ply, 5 sets of 2-ply toilet paper 1x are stacked and measured as 10 sheets, and the thickness of the 10-ply paper is calculated. In addition, the measurement is repeated 10 times (measure 10 different places instead of measuring the same place 10 times), and the average of the measurement results is used as the final paper thickness, and the thickness of the product ply (2-ply) is calculated proportionally. In the case of 3-ply toilet paper 1x, 3 sets are stacked and measured as 9 sheets, and the thickness of the product ply (3-ply) is calculated proportionally as in the case of 2-ply.

[0040] (specific volume) The specific volume of the toilet paper 1x according to one embodiment of the present invention has a lower limit of 5.0 cm 3 / g or more is preferable, and 5.5 cm 3 / g or more is more preferable, and 6.0 cm 3 The upper limit is preferably 9.5 cm / g or more. 3 / g or less is preferable, and 8.5 cm 3 / g or less is more preferable, and 8.0 cm 3 / g or less is more preferable. 3 If the specific volume is less than 9.5 cm3 / g, too much water will adhere to the paper when it is bonded with water, resulting in a poor feel to the touch. 3 If the ratio exceeds 1 / g, the plies will not bond well with water and will be prone to peeling. The specific volume is calculated by dividing the thickness of 1x toilet paper by the basis weight, and expressing the volume per unit g cm 3 It is expressed as:

[0041] (DMDT) The tensile strength DMDT (Dry Machine Direction Tensile Strength) in the MD direction when dry based on JIS P 8113 of the toilet paper 1x according to one embodiment of the present invention is preferably 2.8 N / 25 mm or more, more preferably 3.3 N / 25 mm or more, and even more preferably 3.6 N / 25 mm or more. The upper limit is preferably 6.6 N / 25 mm or less, more preferably 5.4 N / 25 mm or less, and even more preferably 4.6 N / 25 mm or less. If the DMDT is less than 2.8 N / 25 mm, the toilet paper 1x is more likely to tear due to the adhesion of a large amount of water when bonding with water. If the paragraph DMDT exceeds 6.6 N / 25 mm, the feel of the toilet paper 1x is poor.

[0042] (DCDT) In addition, the lower limit of the tensile strength in the CD direction when dry (DCDT) is preferably 0.9 N / 25 mm or more, more preferably 1.1 N / 25 mm or more, and even more preferably 1.2 N / 25 mm or more. In addition, the upper limit is preferably 2.4 N / 25 mm or less, more preferably 1.9 N / 25 mm or less, and even more preferably 1.6 N / 25 mm or less. If the DCDT is less than 0.9 N / 25 mm, the toilet paper 1x is easily torn due to the adhesion of a large amount of water when bonding with water. If the DCDT exceeds 2.4 N / 25 mm, the feel of the toilet paper 1x is poor.

[0043] In this case, the MD direction is the manufacturing direction (also called the machine direction or flow direction) of the toilet paper 1x during production. The CD direction is the direction perpendicular to the MD direction (also called the cross direction or width direction). The DMDT and DCDT of the toilet paper 1x are measured in 2 or 3 ply form in accordance with JIS P 8113.

[0044] (DGMT) Square root of the product of the above DMDT and DCDT (DMDT × DCDT) 1 / 2 is called DGMT (Dry Geometric Tensile Strength), and the lower limit of DGMT is preferably 1.6N / 25mm or more, more preferably 1.9N / 25mm or more, and even more preferably 2.1N / 25mm or more. The upper limit is preferably 4.0N / 25mm or less, more preferably 3.2N / 25mm or less, and even more preferably 2.6N / 25mm or less. If the DGMT is less than 1.6N / 25mm, the toilet paper 1x will be easily torn due to the large amount of water that adheres when the paper is bonded with water. If the DGMT is more than 4.0N / 25mm, the feel of the toilet paper 1x will be poor.

[0045] (DGMT / basis weight of toilet paper x 1000) The value obtained by dividing the DGMT by the toilet paper basis weight and multiplying the result by 1000 is preferably 42 or more and 105 or less. If this value is less than 42, the toilet paper 1x will be easily torn due to the adhesion of too much water when bonding with water. If this value exceeds 105, the touch of the toilet paper 1x will be poor. The lower limit is more preferably 51 or more, and even more preferably 55 or more. The upper limit is more preferably 84 or less, and even more preferably 75 or less.

[0046] (Embossed) The toilet paper 1x according to one embodiment of the present invention is provided with an embossment 10, and it is preferable that the embossment 10 is a double embossment, that is, the embossment 10 is provided on both the ply on the roll front surface 1a side and the ply on the roll back surface 1b side before lamination. This makes it easier to adjust the roll diameter DR to fall within a predetermined range.

[0047] (First embossing) The embossment 10 includes a line-shaped first embossment 11 as shown in Fig. 2. The shape of the first embossment 11 is preferably a floral pattern as shown in Fig. 2, but the pattern or design is not particularly limited other than the line shape as long as the area ratio described below is within a predetermined numerical range and the pattern is aesthetically pleasing. The line shape of the first embossment 11 is defined as an embossed pattern having a length of 3 mm or more. In other words, the first embossment 11 includes an embossed pattern having a length of 3 mm or more.

[0048] (First embossing depth) In the embossment 10, the depth of the first embossment 11 imparted to the ply on the roll surface 1a side is preferably 100 μm or more, more preferably 190 μm or more, and even more preferably 240 μm or more. The upper limit is preferably 480 μm or less, more preferably 410 μm or less, and even more preferably 360 μm or less. If the depth of the first embossment 11 is less than 100 μm, the first embossed convex surface on the roll surface 1a side (the embossed portion of the toilet paper surface is a concave portion) cannot reliably contact the ply on the roll back surface 1b side, so water adhesion is not possible and the ply peeling is likely to occur. If the depth of the first embossment 11 exceeds 480 μm, the first embossed convex surface to which water is applied is too deep, and the toilet paper 1x is likely to tear when water is applied.

[0049] (First embossing area ratio) The area ratio of the portion where the first embossing 11 is applied is preferably 2% or more and 15% or less. If the area ratio is less than 2%, the adhesive surface by water is not sufficiently secured, and ply peeling is likely to occur. If the area ratio exceeds 15%, the adhesive surface by water becomes too large, and the feel of the toilet paper 1x becomes poor. The lower limit of the area ratio of the portion where the first embossing 11 is applied is preferably 2% or more, more preferably 3% or more, and even more preferably 4% or more. The upper limit is preferably 15% or less, more preferably 12% or less, and even more preferably 9% or less.

[0050] The area ratio of the portion where the first embossing 11 is applied in an embossing roll for embossing a sheet is regarded as the area ratio of the first embossing 11 in the toilet paper 1x.

[0051] (Second embossing) In addition to the above-mentioned first embossment 11, the embossment 10 shown in Fig. 2 preferably further includes dot-shaped second embossment 12. By providing the second embossment 12, the toilet paper 1x has a smooth feel. The second embossment 12 is preferably provided in a portion where the first embossment 11 is not provided (around the first embossment 11), but it does not matter if there is an area around the first embossment 11 where the second embossment 12 is not provided. The second embossment 12 includes an embossment pattern with a length of less than 3 mm.

[0052] In addition, the lower limit of the depth of the second embossment 12 in the ply on the roll surface 1a side is preferably 50 μm or more, more preferably 100 μm or more, and even more preferably 130 μm or more. In addition, the upper limit is preferably 240 μm or less, more preferably 210 μm or less, and even more preferably 190 μm or less. If the depth of the second embossment 12 is less than 50 μm, the toilet paper 1x will be too smooth and will be inferior in smoothness. If the depth of the second embossment 12 exceeds 240 μm, the toilet paper 1x will be inferior in smoothness.

[0053] In addition, the lower limit of the depth of the second embossment 12 in the ply on the roll back surface 1b side is preferably 50 μm or more, more preferably 100 μm or more, and even more preferably 130 μm or more. In addition, the upper limit is preferably 240 μm or less, more preferably 210 μm or less, and even more preferably 190 μm or less. If the depth of the second embossment 12 is less than 50 μm, the toilet paper 1x is too smooth and has poor smoothness. If the depth of the second embossment 12 exceeds 240 μm, the toilet paper 1x has poor smoothness.

[0054] The depths of the embossment 10, the first embossment 11, and the second embossment 12 are determined by measuring the height difference of the embossments using a microscope. As the microscope, a product name "One Shot 3D Measuring Microscope VR-3100" manufactured by KEYENCE Corporation can be used. As the observation, measurement, and image analysis software for the microscope images, a product name "VR-H1A" can be used. The measurement conditions are a magnification of 12 times and a field of view area of ​​24 mm x 18 mm. The measurement magnification and field of view area may be appropriately changed depending on the size of the embossment 10.

[0055] FIG. 3 shows a height profile on the XY plane taken by a microscope, and the height of the surface of the toilet paper 1x is represented by shading. The linear areas in FIG. 3 that are shaded differently from the surroundings represent individual embossments 10. The depth of the embossment 10 is determined by measuring the height difference of the embossment 10 using the above-mentioned microscope. The measurement is performed on the roll surface 1a side of the toilet paper 1x. In addition, when measuring, five turns of toilet paper 1x are removed from the toilet roll 1 with the number of plies remaining the same, and the sixth turn of toilet paper 1x is used to measure the sheet without changing the number of plies. In addition, if there are perforations, they are avoided in the measurement.

[0056] First, a line segment AB is drawn as shown in Figure 3 to obtain the height profile in Figure 4. The line segment AB should be drawn so as to cross the embossments 10. The line segment AB is drawn in the roll width direction (CD direction) of the toilet paper 1x, but if the distance between the embossments 10 is narrow, for example 2 mm or less, and the height of the convex portions described below becomes low, the line segment may be drawn diagonally or in the roll winding direction. The height profile is a (measured) cross-sectional curve S1 that represents the unevenness of the actual sample surface of toilet paper 1x, but it also contains noise (steep peaks caused by fiber clumps on the surface of toilet paper 1x, whisker-like fibers, and areas without fibers), and such noise peaks must be removed when calculating the height difference of the unevenness.

[0057] Therefore, the (measured) profile curve S1 in FIG. 4 is smoothed using a filter size of ±12 for the weighted average radio button to obtain the profile curve S2 in FIG. 5. Note that smoothing using the filter for the weighted average radio button can be obtained automatically by using the above-mentioned analysis software. Then, in the graph shown in FIG. 5, a recess (minimum value) D1 of the embossment 10 and a recess (minimum value) D2 of the embossment 10 adjacent to D1 are found. Next, the protrusion (maximum value or maximum value) between D1 and D2 is designated as H1. Similarly, D3, D4, H2, and H3 are found. Next, subtract the value of D2 from the average value of the vertical axis for H1 and H2 to obtain the embossing depth. Similarly, subtract the value of D3 from the average value of the vertical axis for H2 and H3 to obtain the embossing depth. At this stage, two data points are obtained.

[0058] After that, the toilet roll 1 is rotated 90 degrees three times in the roll winding direction of the toilet paper 1x, and the same measurement as above is taken at each position (a total of four measurement positions in the roll winding direction), and the average value of the total of eight positions (2 x 4) is ultimately adopted as the depth of the embossment 10. The above measurements are performed on the first embossment 11 and the second embossment 12 on the roll front surface 1a, and the second embossment 12 on the roll back surface 1b.

[0059] <Toilet roll manufacturing method> Regarding the manufacturing process of the toilet paper 1x and the toilet roll 1, for example, they can be manufactured in the following order: (1) papermaking and creping, (2) embossing and ply bonding, and (3) roll winding. In addition, in the (1) papermaking process, it is preferable to make the paper using a general dry crepe papermaking machine, without using a bulky papermaking machine such as a TAD.

[0060] (Water adhesion) (2) In the ply bonding, water is used for bonding the ply after embossing. By using water instead of a glue component, the stiff feeling of the toilet paper 1x when glue is used is eliminated, and the touch is improved. In the present invention, "water" refers to a glue component content of 0.01% or less, preferably 0.005% or less, and more preferably 0.001% or less.

[0061] As described above, according to this embodiment, even when the laminated plies are bonded with water, it is possible to provide a toilet roll 1 that is resistant to tearing when bonded, is resistant to peeling during use, and has a pleasant feel. EXAMPLES

[0062] The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to the following examples in any way.

[0063] Under each of the conditions shown in Tables 1 to 3, toilet papers and toilet rolls each having 2 or 3 plies were produced in Examples 1 to 20 and Comparative Examples 1 to 9, and the following evaluations were carried out. Each evaluation was performed after maintaining the sample in equilibrium under the temperature and humidity conditions (23±1°C, 50±2% RH) specified in JIS P8111. Each parameter other than the following evaluation was performed according to the standards or measurement methods described above.

[0064] (Tactile sensation) Thirty testers evaluated the feel of the toilet paper. The number of testers who rated the toilet paper as smooth was determined by the number of testers who thought the smoothness was good, and the results were rated on a four-point scale. 5: More than 29 testers rated the smoothness of the toilet paper as good. 4: 27 to 28 people rated the smoothness of the toilet paper as good. 3: The number of monitors who rated the smoothness of the toilet paper as good was between 25 and 26. 2: The number of monitors who rated the smoothness of the toilet paper as good was 21 to 24. 1: Fewer than 20 testers rated the smoothness of the toilet paper as good

[0065] (Resistance to ply peeling) Thirty test subjects evaluated the toilet paper for its resistance to peeling off when used. The toilet paper was rated on a four-point scale based on the number of test subjects who rated it as being resistant to peeling off. 5: More than 29 testers rated the toilet paper as being resistant to peeling. 4: The number of monitors who rated the toilet paper as being resistant to peeling was between 27 and 28. 3: The number of monitors who evaluated that the toilet paper ply is difficult to peel off is between 25 and 26. 2: The number of monitors who evaluated that the toilet paper ply is difficult to peel off is between 21 and 24. 1: Fewer than 20 monitors rated the toilet paper as being less likely to peel off

[0066] (Resistance to tearing when exposed to water) When toilet paper was glued together with water, the resistance of the toilet paper to tearing in the area where water was applied was rated on a 5-point scale. 5: No tearing of the toilet paper was observed, and the operability was very good. 4: There was almost no tearing of the toilet paper, and the operability was good. 3: Toilet paper was torn, but operation was not affected. 2: The toilet paper was slightly torn, and operability was poor. 1: Toilet paper was torn and operability was very poor.

[0067] Tables 1 to 3 show the conditions and evaluation results for each of the examples and comparative examples.

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] From the above, it was at least confirmed that even when the laminated plies are bonded with water, it is possible to obtain a toilet roll that is resistant to tearing when bonded, is resistant to peeling during use, and has a pleasant feel. [Explanation of symbols]

[0072] 1 toilet roll 1a Roll surface 1b Back side of roll 1e The edge of the outermost roll of toilet paper 1x toilet paper 10, 11, 12 Embossed

Claims

1. A toilet roll having 2 or 3 plies of toilet paper with an embossed pattern wound into a roll, The two or three plies are water bonded; The toilet paper has a basis weight of 32 g / m ２ 44g / m or more ２ below A toilet roll characterized by:

2. The tensile strength of the toilet paper in the machine direction when dry based on JIS-P8113 is DMDT, the tensile strength of the toilet paper in the cross direction when dry is DCDT, and the square root of the product of DMDT and DCDT (DMDT x DCDT) １／２ When DGMT is used, The toilet roll according to claim 1, characterized in that the value expressed by (DGMT / basis weight of the toilet paper×1000) is 42 or more and 105 or less.

3. The toilet roll according to claim 1 or 2, wherein the content of the temporary wet strength agent in the toilet paper is 0.005% or more and 0.200% or less.

4. The embossed pattern is A first embossment is provided on the ply on the surface side of the toilet roll; A second embossment is provided on the back ply of the toilet roll, The toilet roll according to claim 1 or 2, wherein an area ratio of the first embossment in the toilet paper is 2% or more and 15% or less.

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