Toilet paper roll

Abstract

To provide a toilet paper roll in which a paper tube of a core is hardly crushed, a feeling of use of toilet paper is excellent, the toilet paper in a roll outside tip part is hardly stuck to the toilet paper on a roll center side, and the toilet paper is easily stored in a paper holder, in the toilet paper roll formed by winding the toilet paper to which embossing is not applied.SOLUTION: Provided is a toilet paper roll obtained by winding one ply of toilet paper to which embossing is not applied, in which a basis weight of one ply of the toilet paper is 13 g / m2 or more and 22 g / m2 or less, a bond-cut ratio of a perforation is 26% or more and 42% or less, a tab strength in the area including the perforations is 1.3 N / 75 mm or more and 4.5 N / 75 mm or less, the apparent basis weight of a paper tube is 200 g / m2 or more and 500 g / m2 or less, the mass is 4.0 g or more and 6.0 g or less, and the hardness of the paper tube is 1.6 mm or more and 2.8 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a toilet roll wound with one ply of unembossed toilet paper. [Background technology]

[0002] Various types of toilet rolls (hereinafter also referred to as long toilet rolls) made by rolling up long lengths of toilet paper have been developed and are on sale because they can reduce storage space and the number of times the roll needs to be replaced.

[0003] In order to make the overall size of a long toilet roll compact, it is necessary to increase the winding density and reduce the paper thickness.

[0004] In general toilet rolls, toilet paper (hereinafter also referred to as sheets) is embossed to stabilize the roll diameter and texture, but this increases the paper thickness and increases the difference between the front and back surfaces of the sheet, reducing the paper strength, leading to problems such as a poor usability and the tendency for the sheet to tear when wiping.

[0005] Using toilet paper that is not embossed (does not have an embossed finish) solves these problems and also allows for longer toilet paper rolls to be made, but because the roll is wound more densely, the paper core is more likely to be crushed when the roll is cut to the specified width.

[0006] As a prior art document of such non-embossed toilet paper, for example, Patent Document 1 describes a paper having a beating degree of 350 to 500 mlcsf, a crepe rate of 7 to 12%, and a basis weight of 15 to 17 g / m. 2 The method for producing a long toilet paper roll is disclosed, which is characterized by forming a base paper roll from a base paper produced under the conditions of a thickness of 70 to 90 μm, and winding up the base paper unwound from the base paper roll to produce a paper roll of a specified winding diameter.

[0007] Furthermore, Patent Document 2 discloses a method for producing a coreless toilet paper roll, characterized in that in the winding process in which a web unwound from a raw roll is wound around a reel to produce a paper roll of a predetermined winding diameter, an aqueous slurry in which cellulose nanofibers are suspended is applied to the web at the beginning of winding, and the web is then dried while still wound around the reel in the subsequent drying process.

[0008] Furthermore, Patent Document 3 describes a toilet roll in which one ply of toilet paper is wound into a roll, the toilet paper having a plurality of concaves and convexes, with one surface being a convex portion and the opposite surface being a concave portion, and the toilet roll has a winding length of 105 to 210 m, a winding diameter of 100 to 140 mm, a roll mass not including the core per 114 mm of roll width of 225 to 485 g, a core mass per 114 mm of roll width of 3.2 to 6.0 g, an outer diameter of the core of 25 to 48 mm, and a roll winding density of 0.17 to 0.35 g / cm 3 A toilet roll is disclosed. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent Publication No. 2021-129824 [Patent Document 2] Patent Publication No. 2021-115294 [Patent Document 3] Japanese Patent Publication No. 2020-108825 Summary of the Invention [Problem to be solved by the invention]

[0010] Generally, toilet rolls are made by winding up a log that is several meters wide and the length of the product, then cutting the log axially into slices of the product width using a log saw, and a large number of toilet rolls are produced from one log. In this manufacturing method, tightly wound toilet paper can be used to produce a long toilet paper roll with a limited roll diameter, but if the roll is wound too tightly, the core (the paper tube around which the toilet paper is wound) will be crushed when cut with a log saw.

[0011] Furthermore, if the toilet paper is not embossed (the sheet is not textured), there are no gaps between the rolled toilet paper sheets, which results in a higher winding density and makes the paper tube more likely to collapse. Of course, if you roll toilet roll loosely, the paper tube will not be crushed even when cut with a log saw, but the diameter of the roll will be larger, making it difficult to attach to a paper holder.

[0012] To address these issues, if the log is wound to the product width, subsequent cutting with a log saw is not necessary and the problem of the paper tube being crushed is solved, but this method cannot be adopted because it would significantly reduce productivity. Furthermore, if toilet paper sheets are not embossed, the outer edges of the toilet roll tend to stick to the toilet paper in the center of the roll due to the small gaps between the sheets and the high winding density. This makes it difficult to grip the outer edges of the roll when using it, resulting in a poor user experience.

[0013] For the reasons stated above, with mass-produced, non-embossed toilet paper and toilet rolls that are sized to fit into paper holders, it has been difficult to achieve a balance between resistance to crushing of the paper tube, a comfortable feel when using the toilet paper, and resistance to the toilet paper at the outer tip of the roll sticking to the toilet paper at the center of the roll.

[0014] The present invention has been made in view of the above circumstances, and aims to provide a toilet roll in which unembossed toilet paper is wound to a roll diameter within a certain range, in which the paper tube of the core is less likely to be crushed, the toilet paper has an excellent feel when used, the toilet paper at the outer tip of the roll is less likely to stick to the toilet paper at the center of the roll, and the toilet roll is easy to store in a paper holder. [Means for solving the problem]

[0015] The inventors have conducted extensive research and have found that, in a toilet roll produced by winding one ply of unembossed toilet paper around a paper tube, the winding length, winding diameter, roll density, and basis weight of one ply of toilet paper are all within predetermined numerical ranges, the toilet paper is perforated at predetermined intervals, the bond / cut ratio of the perforations and the tab strength of the area including the perforations are all within predetermined numerical ranges, and the apparent basis weight, mass, and hardness of the paper tube are all within predetermined numerical ranges, thereby making it possible to produce a toilet roll in which the core paper tube is less likely to be crushed, the toilet paper has an excellent feel when used, the toilet paper at the outer tip of the roll is less likely to stick to the toilet paper at the center of the roll, and which is easy to store in a paper holder, and which has been completed.

[0016] (1) The first aspect of the present invention is a toilet roll in which one ply of unembossed toilet paper is wound around a paper tube in a roll shape, and the roll length is 130 m or more and 230 m or less, the roll diameter is 100 mm or more and 143 mm or less, and the roll density is 0.15 g / cm 3 More than 0.33g / cm 3 Below, winding density is 1.1m / cm 2 More than 2.0m / cm 2 The basis weight of one ply of the toilet paper is 13 g / m or less. 2 More than 22g / m 2The toilet paper has perforations extending in the width direction, arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction, and the ratio of the bonded part to the cut part of the perforations (bond-cut ratio) is 26% or more and 42% or less, the tab strength of the region including the perforations is 1.3 N / 75 mm or more and 4.5 N / 75 mm or less, and the apparent basis weight of the paper tube is 200 g / m 2 More than 500g / m 2 The mass of the paper tube is 4.0 g or more and 6.0 g or less. The paper tube is placed horizontally on a hard table so that the axis is horizontal, and a compression element (area 2.0 cm) is attached to the center of the outer surface of the paper tube. 2 ) is pressed from above at a speed of 10 mm / min, and the pressure applied by the compression element is 0.5 gf / cm 2 The indentation depth when the pressure is 250gf / cm is T0. 2 The indentation depth at this time is T m As, (T m -T0) is the hardness of the paper tube, the hardness of the paper tube is 1.6 mm or more and 2.8 mm or less.

[0017] (2) The second aspect of the present invention is the toilet roll described in (1), characterized in that the tensile strength DMDT of the toilet paper in the dry MD direction according to JIS P 8113 is 2.0 N / 25 mm or more and 8.5 N / 25 mm or less.

[0018] (3) A third aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the tensile strength (DCDT) of the toilet paper in the CD direction when dry according to JIS P 8113 is 0.7 N / 25 mm or more and 3.0 N / 25 mm or less.

[0019] (4) A fourth aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the roll mass excluding the paper core is 250 g or more and 450 g or less.

[0020] (5) The fifth aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the thickness of the toilet paper is 0.7 mm / 10 sheets or more and 1.7 mm / 10 sheets or less.

[0021] (6) The sixth aspect of the present invention is the toilet roll according to (1) or (2), wherein the specific volume of the toilet paper is 3.6 cm 3 / g or more 6.0cm 3 / g or less.

[0022] (7) A seventh aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the outer diameter of the paper tube is 25 mm or more and 48 mm or less. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a toilet roll wound with non-embossed toilet paper, in which the paper tube of the core is less likely to be crushed, the toilet paper has an excellent feel when used, the toilet paper at the outer tip of the roll is less likely to stick to the toilet paper at the center of the roll, and the toilet roll is easy to store in a paper holder. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view showing the appearance of a toilet roll according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present 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.

[0026] In the drawings, the same elements are denoted by the same reference numerals, and redundant explanations will be 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 those shown in the drawings.

[0027] <Toilet roll> Figure 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 in which one ply of unembossed toilet paper 1x is wound into a roll around a paper tube 1d that serves as a core. The toilet paper 1x (hereinafter also simply referred to as the sheet) has perforations 1c extending in the width direction, arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction (perforations 1c will be described later). As shown in FIG. 1, of the surfaces of the toilet paper 1x (hereinafter also referred to simply as the sheet), the surface facing the outside of the roll is referred to as the roll surface 1a (the surface of the toilet paper 1x), the surface facing 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 wound toilet paper 1x is referred to as the outermost roll edge 1e of the toilet paper 1x.

[0028] (Volume length) The roll length of the toilet roll 1 is between 130 m and 230 m. If the roll length is less than 130 m, and the roll diameter DR described below remains unchanged, the resulting roll density will be too low, making it difficult to fit into a paper holder. If the roll length exceeds 230 m, and the roll diameter DR described below remains unchanged, the resulting roll density will be too high. Furthermore, if the roll density becomes too high, the paper tube 1d will be easily crushed, the toilet paper rolls 1x will be more likely to stick together, and it will be difficult to fit into a paper holder. The lower limit of the roll length of the toilet roll 1 is preferably 140 m or more, more preferably 150 m or more, and the upper limit is preferably 214 m or less, more preferably 200 m or less.

[0029] (roll diameter) The roll diameter DR of the toilet roll 1 is 100 mm or more and 143 mm or less. If the roll diameter DR is less than 100 mm, the roll diameter DR is too small, resulting in an excessively dense roll. Furthermore, the toilet roll 1 will be tightly wound, making the paper core 1d more likely to be crushed when cut, and the toilet paper 1x at the outer tip of the roll more likely to stick to the toilet paper 1x in the center of the roll. If the roll diameter DR exceeds 143 mm, the roll diameter DR will be too large, making it difficult to attach the toilet roll 1 to a paper holder. The lower limit of the roll diameter DR of the toilet roll 1 is preferably 109 mm or more, more preferably 115 mm or more, and the upper limit is preferably 140 mm or less, more preferably 138 mm or less.

[0030] To determine the roll length, measure the length of 10 sheets of toilet paper 1x between perforations 1c on 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 1.5m and there are 200 sheets of toilet paper 1x, then the roll length is 1.5m x (200 / 10) = 30m. The roll diameter DR is measured using a diameter ruler 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.

[0031] (seat length and width) Furthermore, the length between perforations 1c (toilet paper 1x sheet length) preferably has a lower limit of 100mm or more, more preferably 121mm or more, and even more preferably 144mm or more. The upper limit is preferably 235mm or less, more preferably 213mm or less, and even more preferably 190mm or less. If the sheet length is less than 100mm, the toilet paper 1x will not feel good to use, and the perforations 1c will be more likely to tear in unintended places, resulting in a poor usability as a roll product. If the sheet length exceeds 235mm, it will be difficult for air to enter between the sheets through the cut portions of the perforations 1c, and as a result, the toilet paper 1x at the outer tip of the roll will be more likely to stick to the toilet paper 1x at the center of the roll. The lower limit of the sheet width of the toilet paper 1x is preferably 100 mm or more, more preferably 105 mm or more, and even more preferably 108 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. By ensuring that the sheet length and width are within the above numerical ranges, when using the toilet roll 1 of the present application, the toilet paper 1x at the outer tip of the roll is less likely to stick to the toilet paper 1x at the center of the roll. In addition, the area used is appropriate, the perforations 1c are less likely to tear in unintended places, and the roll is suitable for use in one ply, providing a good feel when used.

[0032] (roll mass) The roll mass of the toilet roll 1 is preferably 250 g or more and 450 g or less. If the roll mass is less than 250 g and the winding length does not change, the toilet paper 1x will have a low basis weight as a result, and the toilet paper 1x at the outer tip of the roll will tend to stick to the toilet paper 1x at the center of the roll. If the roll mass exceeds 450 g and the winding length does not change, the toilet roll 1 will tend to be tightly wound, and the paper core 1d will tend to be crushed when cut. The lower limit of the roll mass of the toilet roll 1 is more preferably 251 g or more, and the upper limit is more preferably 430 g or less, and even more preferably 410 g or less. The roll mass in the above numerical range is the mass of one roll per 114 mm of roll width, excluding the paper tube 1d (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.

[0033] (roll density) The roll density of toilet roll 1 is 0.15 g / cm 3 More than 0.33g / cm 3 The roll density is 0.15 g / cm or less. 3 If the roll density is less than 0.33 g / cm, and the roll length remains unchanged, the basis weight of the toilet paper 1x will be lowered, and the toilet paper 1x at the outer tip of the roll will be more likely to stick to the toilet paper 1x at the center of the roll. 3 If the thickness exceeds this value, the toilet roll 1 will be tightly wound, and the paper core 1d will be easily crushed when cut. The minimum roll density of toilet roll 1 is 0.18 g / cm 3 It is preferable that the concentration is 0.21 g / cm or more. 3 The upper limit is more preferably 0.30 g / cm. 3 Preferably, it is 0.28 g / cm or less. 3 More preferably, it is:

[0034] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of toilet roll 1 per 114 mm of roll width. Roll volume is expressed as [{cross-sectional area of ​​the roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​the paper core outer diameter DI)] x roll width (converted per 114 mm). For example, if the roll mass per 114 mm of roll width (excluding paper core 1d) is 309 g, the winding diameter DR is 121 mm, and the outer diameter DI of the paper core 1d is 40 mm, the roll density = 0.26 g / cm 3 This becomes: If the toilet roll 1 does not have a paper tube 1d, the diameter of the central hole is the core outer diameter (outer diameter DI of the paper tube 1d).

[0035] (winding density) Furthermore, the winding density of toilet roll 1 is 1.1 m / cm 2 More than 2.0m / cm 2 The winding density is 1.1m / cm 2 If the winding density is less than 2.0 m / cm, the toilet roll 1 will be wound too loosely and will be prone to dents, causing the roll to distort when attached, making it difficult to attach the toilet roll 1 to the paper holder. 2 If the tension exceeds this, the toilet roll 1 will be tightly wound, making the paper core 1d more likely to be crushed when cut. Also, because the sheets are pressed together and become stiff, the toilet paper 1x at the outer tip of the roll will be more likely to stick to the toilet paper 1x in the center of the roll. Furthermore, if the roll is wound too tightly, it will be difficult to hold, and as a result, the toilet roll 1 will be difficult to attach to a paper holder. The minimum winding density of toilet roll 1 is 1.2 m / cm 2 It is preferable that the thickness is 1.3 m / cm or more. 2 The upper limit is more preferably 1.9 m / cm or more. 2 Preferably, it is 1.6 m / cm or less. 2 More preferably, it is:

[0036] 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 outer diameter part of the roll (winding diameter DR) - (cross-sectional area of ​​the outer diameter part of the cardboard tube 1d, DI)}. For example, in the case of a winding length of 150m, 1 ply, winding diameter DR of 121mm, and outer diameter DI of the cardboard tube 1d of 40mm, the winding density = (150m x 1) ÷ {3.14 x (121mm ÷ 10) 2 -3.14×(40mm÷10) 2}=1.5m / cm 2 This becomes:

[0037] (Outer diameter of paper tube) The outer diameter DI of the paper tube 1d, which is the outer diameter of the core of the toilet roll 1 of the present invention, is preferably 25 mm or more and 48 mm or less. If the outer diameter DI is less than 25 mm, it will be difficult to fit the toilet roll 1 into a paper holder. If the outer diameter DI exceeds 48 mm, the winding density will end up being too high if the winding diameter DR remains unchanged. Furthermore, if the winding density is too high, the paper tube 1d will be more likely to be crushed, the toilet paper rolls 1x will be more likely to stick together, and it will also be difficult to fit into a paper holder. The lower limit of the outer diameter DI of the cardboard tube 1d is more preferably 29 mm or more, and even more preferably 33 mm or more, and the upper limit is more preferably 45 mm or less, and even more preferably 41 mm or less. The outer diameter DI of the paper tube 1d is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The paper tube 1d of four toilet rolls 1 is measured and the measurement results are averaged. If there is no paper tube 1d, the diameter of the hollow core part is measured.

[0038] The mass of the paper tube 1d is 4.0 g or more and 6.0 g or less. If the mass of the paper tube 1d is less than 4.0 g, the paper tube 1d is easily crushed. If the mass of the paper tube 1d is more than 6.0 g, the paper tube 1d becomes too hard and a large force must be applied to cut it, making the paper tube 1d easily crushed. The lower limit of the mass of the cardboard tube 1d is preferably 4.3 g or more, more preferably 4.6 g or more, and the upper limit is preferably 5.9 g or less, more preferably 5.4 g or less. The mass of the paper core 1d in the above numerical range is the mass of the paper core 1d per 114mm of roll width, excluding the paper core 1d (core) of the toilet roll 1, and if the roll width is not 114mm, it is converted to the mass per 114mm by proportional calculation.

[0039] The apparent basis weight of the paper tube 1d is 200 g / m 2 More than 500g / m 2 The apparent basis weight of the paper tube 1d is 200 g / m 2If the apparent basis weight of the paper tube 1d is less than 500 g / m, the paper tube 1d is likely to be crushed. 2 If the cutting speed exceeds this value, the paper tube 1d becomes too hard and a large force must be applied to cut it, which makes the paper tube 1d prone to being crushed. The apparent basis weight of the paper tube 1d has a lower limit of 260 g / m 2 It is preferable that the weight is 290 g / m or more. 2 The upper limit is more preferably 430 g / m or more. 2 Preferably, it is 405 g / m or less. 2 It is more preferable that the apparent basis weight of the paper tube 1d is measured in accordance with JIS P 8124. The reason why it is written as apparent basis weight is because the paper of the paper tube 1d is made by gluing two sheets of paper together, so the apparent basis weight means the basis weight after the two sheets of paper are overlapped.

[0040] Furthermore, the hardness of the paper tube 1d is 1.6 mm or more and 2.8 mm or less. If the hardness of the paper tube 1d is less than 1.6 mm, the paper tube 1d is easily crushed. If the hardness of the paper tube 1d is more than 2.8 mm, the paper tube 1d becomes too hard and a large force must be applied to cut it, making the paper tube 1d easily crushed. The lower limit of the hardness of the cardboard tube 1d is preferably 1.7 mm or more, more preferably 1.8 mm or more, and the upper limit is preferably 2.7 mm or less, more preferably 2.6 mm or less. The hardness of the cardboard tube 1d is measured using a compression tester (handy compression tester KES-G5 manufactured by Kato Tech Co., Ltd.) as follows: First, the cardboard tube 1d is placed horizontally on a hard table so that the axis is horizontal, and a compression tool (area 2.0 cm) is placed in the center of the outer surface of the cardboard tube 1d. 2 ) is pressed from above at a speed of 10 mm / min, and the pressure applied by the compression element is 0.5 gf / cm 2 The indentation depth when the pressure is 250gf / cm is T0. 2 The indentation depth at this time is T m As, (T m -T0) is calculated as the hardness of the paper tube 1d.

[0041] <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, or may include recycled paper pulp, non-wood pulp, deinked pulp, recycled paper from liquid beverage cartons, etc. However, from the standpoint of quality, the content of pulp other than wood pulp or 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. To achieve the target quality, the NBKP (softwood bleached kraft pulp) content is preferably 5% to 55% by mass, more preferably 15% to 45% by mass, and even more preferably 20% to 35% by mass, and the LBKP (hardwood bleached kraft pulp) content is preferably 45% to 95% by mass, more preferably 55% to 85% by mass, and even more preferably 65% ​​to 80% by mass.

[0042] (Basic weight) The basis weight of one ply of toilet paper 1x according to one embodiment of the present invention is 13 g / m 2 More than 22g / m 2 The basis weight of one roll of toilet paper is 13 g / m 2 If the basis weight of the toilet paper 1x is less than 22 g / m, the toilet paper 1x will be too soft, and the toilet paper 1x at the outer tip of the roll will tend to stick to the toilet paper 1x at the center of the roll. 2 If the thickness exceeds this, the toilet paper 1x will be too stiff when wound, and as a result the paper tube 1d will be easily crushed when cut. The minimum basis weight of one ply of toilet paper is 14 g / m 2 It is preferable that the content is 14.5 g / m or more. 2 The upper limit is more preferably 21 g / m or more. 2 Preferably, it is 20.5 g / m or less. 2It is more preferable that the basis weight of 1x toilet paper is measured in accordance with JIS P 8124.

[0043] (paper thickness) The paper thickness (for 10 sheets) of the toilet paper 1x according to one embodiment of the present invention is preferably 0.7 mm / 10 sheets or more and 1.7 mm / 10 sheets or less. If the paper thickness is less than 0.7 mm / 10 sheets, the toilet paper 1x will be too thin, and the toilet paper 1x at the outer tip of the roll will tend to stick to the toilet paper 1x at the center of the roll. If the paper thickness exceeds 1.7 mm / 10 sheets, the roll diameter DR will be large, making it difficult to attach the toilet roll 1 to a paper holder. The upper limit of the paper thickness of 10 plies of toilet paper 1x is more preferably 1.5 mm / 10 sheets or less, and even more preferably 1.4 mm / 10 sheets or less. The thickness of toilet paper roll 1x is measured using a thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa, a probe diameter of 30 mm, and a sample placed between the probe and the measuring table. The gauge is read when the probe is lowered at a speed of 1 mm per second or less. Ten sets of one-ply toilet paper roll 1x are then stacked, and measurements are taken for 10 sheets, which is then calculated as the thickness of 10 plies. The measurement is also repeated 10 times (measure 10 different locations, rather than measuring the same location 10 times), and the average of the measurement results is used as the final paper thickness.

[0044] (specific volume) In addition, the specific volume of toilet paper 1x according to one embodiment of the present invention is 3.6 cm 3 / g or more 6.0cm 3 / g or less. 3 If the specific volume is less than 6.0 cm3 / g, the toilet paper 1x will be too soft, and the toilet paper 1x at the outer tip of the roll will tend to stick to the toilet paper 1x at the center of the roll. 3If the hardness exceeds 1 / g, the toilet roll 1 will be too hard when the toilet paper 1x is wound, and as a result, the paper core 1d will be easily crushed when cut. The specific volume of 1x toilet paper has a lower limit of 4.1 cm 3 / g or more is more preferable, and 4.7cm 3 The upper limit is 5.8 cm / g or more. 3 / g or less is more preferable, and 5.7cm 3 The specific volume is calculated by dividing the thickness of 1x toilet paper by the basis weight, and is expressed as the volume cm per unit g. 3 It is expressed as:

[0045] (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of the toilet paper 1x according to one embodiment of the present invention in a dry state based on JIS P 8113 is preferably 2.0 N / 25 mm or more and 8.5 N / 25 mm or less. If the DMDT is less than 2.0 N / 25 mm, the perforations 1c tend to tear in unintended places, making the roll product difficult to use (the toilet paper 1x has a poor feel). Furthermore, the toilet paper 1x is too soft, and the toilet paper 1x at the outer end of the roll tends to stick to the toilet paper 1x closer to the center of the roll. If the DMDT exceeds 8.5 N / 25 mm, the toilet paper 1x becomes too stiff when wound, and as a result, the paper tube 1d tends to be crushed when cut.

[0046] Furthermore, the dry cross direction tensile strength (DCDT) of the toilet paper 1x in the dry state based on JIS P 8113 is preferably 0.7 N / 25 mm or more and 3.0 N / 25 mm or less. If the DCDT is less than 0.7 N / 25 mm, the perforations 1c tend to tear in unintended places, making the roll product difficult to use (the toilet paper 1x has a poor feel). Also, the toilet paper 1x is too soft, and the toilet paper 1x at the outer edge of the roll tends to stick to the toilet paper 1x in the center of the roll. If the DCDT exceeds 3.0 N / 25 mm, the toilet paper 1x becomes too stiff when wound, resulting in the paper core 1d being easily crushed when cut.

[0047] The lower limit of DMDT is more preferably 2.4 N / 25 mm or more, and even more preferably 2.8 N / 25 mm or more, and the upper limit is more preferably 6.2 N / 25 mm or less, and even more preferably 4.0 N / 25 mm or less. The lower limit of DCDT is more preferably 1.1 N / 25 mm or more, and even more preferably 1.5 N / 25 mm or more, and the upper limit is more preferably 2.6 N / 25 mm or less, and even more preferably 2.2 N / 25 mm or less. In this case, the MD direction is the manufacturing direction (machine direction, also called the longitudinal direction) of the toilet paper 1x during production. The CD direction is the direction perpendicular to the MD direction (cross direction, also called the width direction). The DMDT and DCDT of the toilet paper 1x are measured in accordance with JIS P 8113.

[0048] (perforation) In a toilet roll 1 according to one embodiment of the present invention, the toilet paper 1x has perforations 1c extending in the width direction and arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction.

[0049] In this case, the pitch of the perforations 1c (the distance between the perforations 1c in the longitudinal direction) is 100mm or more and 235mm or less. If the pitch is less than 100mm, the perforations 1c will be easily torn, making it difficult to use as a roll product. If the pitch is more than 235mm, it will be difficult for air to enter between the sheets through the cut parts of the perforations 1c, and as a result, the toilet paper 1x at the outer tip of the roll will be more likely to stick to the toilet paper 1x in the center of the roll. The lower limit of the pitch of the perforations 1c is more preferably 145 mm or more, and even more preferably 190 mm or more, and the upper limit is more preferably 230 mm or less, and even more preferably 225 mm or less. The pitch of perforation 1c is measured with a ruler.

[0050] In addition, the ratio of the bonded portion to the cut portion of the perforation 1c (bond-cut rate) is 26% or more and 42% or less. If the bond-cut rate is less than 26%, the perforation 1c will be easily torn, making it difficult to use as a roll product (the toilet paper 1x will have a poor feel). If the bond-cut rate is more than 42%, it will be difficult for air to enter between the sheets through the cut portion of the perforation 1c, and as a result, the toilet paper 1x at the outer tip of the roll will be more likely to stick to the toilet paper 1x in the center of the roll. The bond cut rate of the perforation 1c is preferably at least 30%, more preferably 33%, and is preferably at most 40%, more preferably 38%. The bond cut rate of perforation 1c is calculated by ((A / (A+B))×100(%)), where A is the bond width of perforation 1c and B is the cut width of perforation 1c.

[0051] Furthermore, the tab strength of the area including perforation 1c in toilet paper 1x is 1.3N / 75mm or more and 4.5N / 75mm or less. If the tab strength is less than 1.3N / 75mm, perforation 1c will easily tear in unintended places, making the roll product difficult to use (toilet paper 1x will have a poor usability). If the tab strength is more than 4.5N / 75mm, perforation 1c will be difficult to tear, making the roll product difficult to use (toilet paper 1x will have a poor usability). The tab strength in the region including the perforation 1c has a lower limit of preferably 2.9 N / 75 mm or more, more preferably 3.0 N / 75 mm or more, and an upper limit of preferably 4.2 N / 75 mm or less, more preferably 4.0 N / 75 mm or less.

[0052] <Toilet roll manufacturing method> The manufacturing process for toilet paper 1x and toilet roll 1 can be carried out, for example, as follows: (1) papermaking and creping, and (2) roll winding process. In the (1) papermaking process, it is preferable to use a general dry crepe papermaking machine rather than a bulky papermaking machine such as a TAD.

[0053] As explained above, according to this embodiment, in a toilet roll 1 wound with unembossed toilet paper 1x, the core paper tube 1d is less likely to be crushed, the toilet paper 1x has an excellent feel when used, the toilet paper 1x at the outer tip of the roll is less likely to stick to the toilet paper 1x at the center of the roll, and it is possible to provide a toilet roll 1 that is easy to store in a paper holder. [Example]

[0054] The present invention will be explained in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples in any way.

[0055] Under the conditions shown in Tables 1 to 3, one-ply toilet paper and toilet rolls were produced for Examples 1 to 23 and Comparative Examples 1 to 10, and the following evaluations were carried out. In each evaluation, 1 point was considered a failure, and 2 points or more was considered a pass. Each evaluation was carried out after maintaining the sample in an equilibrium state under the temperature and humidity conditions (23±1°C, 50±2% RH) specified in JIS P8111. Each parameter other than the evaluations below was measured according to the standards or measurement methods described above.

[0056] (Paper tube crushed) Thirty monitors visually inspected the manufactured toilet rolls and evaluated the crushing of the paper tubes. The number of monitors who judged the paper tubes to be not crushed gave a four-point rating. 4: 28 or more monitors rated the paper tube as not crushed. 3: The number of monitors who evaluated that the paper tube was not crushed was between 26 and 27. 2: The number of monitors who evaluated that the paper tube was not crushed was between 23 and 25. 1: The number of monitors who evaluated that the paper tube was not crushed was 22 or less.

[0057] (Toilet paper sticking together (toilet paper sticking at the outer edge of the roll) Thirty test subjects evaluated the toilet paper's sticking resistance (how easily the toilet paper (the outer edge of the roll) sticks to the toilet paper in the center of the roll) when using it. The test was rated on a four-point scale based on the number of test subjects who evaluated that the toilet paper did not stick to each other when pulled out from the roll. 4: 28 or more testers rated the toilet paper as not sticking together. 3: The number of testers who evaluated that the toilet paper sheets did not stick together was between 26 and 27. 2: The number of testers who evaluated that the toilet paper sheets did not stick together was between 23 and 25. 1: Fewer than 22 testers evaluated that the toilet paper sheets did not stick together

[0058] (Attaching the toilet roll to the holder) Thirty test subjects evaluated whether or not it was possible to attach the toilet roll to the paper holder. The test subjects were given a four-point rating based on the number of test subjects who rated that they were able to attach the toilet roll to the paper holder without any problems. 4: More than 28 monitors evaluated that the device could be attached to the paper holder. 3: The number of monitors who evaluated that the paper holder could be attached was between 26 and 27. 2: The number of testers who evaluated that the paper holder could be attached was between 23 and 25. 1: The number of monitors who evaluated that the paper holder could be attached was 22 or less.

[0059] (Toilet paper usage) Thirty test subjects evaluated the usability of the toilet paper. The test subjects rated it on a four-point scale based on the number of test subjects who rated it as excellent in usability because the toilet paper could be easily torn in the intended place. 4: 28 or more testers rated the toilet paper as excellent in usability 3: The number of testers who rated the toilet paper as excellent in usability was between 26 and 27. 2: The number of testers who rated the toilet paper as excellent in usability was between 23 and 25. 1: Fewer than 22 testers rated the toilet paper as excellent in usability

[0060] Tables 1 to 3 show the conditions and evaluation results for each example and each comparative example. [Table 1]

[0061] [Table 2]

[0062] [Table 3]

[0063] From the above, it was at least confirmed that, according to this example, in a toilet roll wound with non-embossed toilet paper, the paper tube of the core is less likely to be crushed, the toilet paper has an excellent feel when used, the toilet paper at the outer tip of the roll is less likely to stick to the toilet paper at the center of the roll, and a toilet roll can be obtained that is easy to store in a paper holder. [Explanation of symbols]

[0064] 1 toilet roll 1a Roll surface 1b Back of roll 1c perforation 1d paper tube 1e The outermost edge of a roll of toilet paper 1x toilet paper

Claims

1. A toilet roll in which one ply of unembossed toilet paper is wound around a paper tube into a roll, The roll length is 130 m or more and 230 m or less, the roll diameter is 100 mm or more and 143 mm or less, and the roll density is 0.15 g / cm ３ 0.33g / cm or more ３ The winding density is 1.1 m / cm ２ 2.0m / cm or more ２ is as follows: The basis weight of one ply of the toilet paper is 13 g / m ２ 22g / m or more ２ is as follows: The toilet paper has perforations extending in the width direction and arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction, The ratio of the bond portion to the cut portion of the perforation (bond cut rate) is 26% or more and 42% or less, In the toilet paper, the tab strength in the region including the perforation is 1.3 N / 75 mm or more and 4.5 N / 75 mm or less, The apparent basis weight of the paper tube is 200 g / m ２ More than 500g / m ２ The mass is 4.0 g or more and 6.0 g or less, The paper tube was placed horizontally on a hard table so that the axis was horizontal, and a compression element (area 2.0 cm) was attached to the center of the outer surface of the paper tube. ２ ) was pressed from above at a speed of 10 mm / min, and the pressure applied by the compression element was 0.5 gf / cm ２ The pressing depth at this time is T ０ , pressure is 250 gf / cm ２ The pressing depth at this time is T ｍ As such, (T ｍ -T ０ ) is the hardness of the paper tube, the hardness of the paper tube is 1.6 mm or more and 2.8 mm or less.

2. The toilet roll according to claim 1, wherein the toilet paper has a tensile strength DMDT in the MD direction when dry according to JIS P 8113 of 2.0 N / 25 mm or more and 8.5 N / 25 mm or less.

3. The toilet roll according to claim 1 or 2, wherein the toilet paper has a tensile strength (DCDT) in the CD direction when dry according to JIS P 8113 of 0.7 N / 25 mm or more and 3.0 N / 25 mm or less.

4. The toilet roll according to claim 1 or 2, characterized in that the roll mass excluding the paper core is 250 g or more and 450 g or less.

5. The toilet roll according to claim 1 or 2, wherein the thickness of the toilet paper is 0.7 mm / 10 sheets or more and 1.7 mm / 10 sheets or less.

6. The specific volume of the toilet paper is 3.6 cm ３ / g or more 6.0cm ３ The toilet roll according to claim 1 or 2, characterized in that the water solubility is 1 / g or less.

7. The toilet roll according to claim 1 or 2, wherein the outer diameter of the paper core is 25 mm or more and 48 mm or less.

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