Toilet roll

Abstract

To provide a toilet roll to which toilet paper without embossment is wound, and in which a paper tube of a core is hardly collapsed, and toilet paper in a tip end of outside of the roll is hardly stuck to toilet paper on a roll center side.SOLUTION: There is provided a toilet roll to which one ply of toilet paper without embossment is wound, in the toilet roll, basis weight of the one ply of toilet paper is 13 g / m2 or more and 22 g / m2 or less, a ratio of bond part / cut part of a perforation (bond cut ratio) is 40% or more and 70% or less, tab intensity of a region including the perforation is 2.5 N / 75 mm or more and 9.0 N / 75 mm or less, apparent basis weight of the paper tube is 200 g / m2 or more and 500 g / m2 or less, and the paper tube has a mass of 4.0 g or more and 6.0 g or less, and 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 formed by winding one ply of unembossed toilet paper. [Background technology]

[0002] A variety of toilet rolls made of long toilet paper rolls (hereinafter also referred to as long toilet rolls) 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 sheet) is embossed to stabilize the roll diameter and texture, but this results in a thicker paper and a larger difference in the surface area between the front and back of the sheet, which reduces the paper strength, resulting in problems such as a poor feel when used and the paper being more likely to tear when wiping.

[0005] Using toilet paper that is not embossed (does not have an embossed finish) solves these problems and also allows a longer length of toilet paper to be rolled up; however, 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 degree of beating of 350 to 500 mlcsf, a crepe ratio of 7 to 12%, and a basis weight of 15 to 17 g / m2. 2 The method for producing a long toilet paper roll is disclosed, which is characterized in that base paper produced under conditions of a thickness of 70 to 90 μm is rolled into a raw roll, and the base paper unwound from the roll is wound up 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, which is 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 specified winding diameter, an aqueous slurry in which cellulose nanofibers are suspended is applied to the web at the beginning of winding, and then in the subsequent drying process, the web is dried while still wound around the reel.

[0008] Furthermore, Patent Document 3 describes a toilet roll in which one ply of toilet paper having a plurality of projections and recesses on one side is wound into a roll, the toilet roll having 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 winding density of the roll 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] JP 2021-115294 A [Patent Document 3] JP 2020-108825 A 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, and then cutting the log axially into rings of the product width using a log saw, producing many toilet rolls from one log. In such a manufacturing method, in order to produce a long toilet roll with a limited roll diameter, it is sufficient to tightly wind the roll, but if it is wound too tightly, the core (the paper tube around which the toilet paper is wound) will be crushed when it is cut with a log saw.

[0011] Furthermore, if the toilet paper is not embossed (the sheet is not uneven), there will be no gaps between the rolled toilet paper, resulting in a higher winding density and making the paper tube more susceptible to crushing. Of course, if the toilet roll is loosely wound, the paper tube will not be crushed even when cut with a log saw, but then the diameter of the roll will be larger, making it difficult to attach to the paper holder.

[0012] To address these issues, if the log is wound up at the product width, subsequent cutting with a log saw is unnecessary 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 the toilet paper sheet is not embossed, the outer end of the toilet roll will tend to stick to the toilet paper in the center of the roll due to the small gap between the sheets and the high winding density. This makes it difficult to pick up the outer end of the roll when using it, resulting in a poor feel.

[0013] For the reasons mentioned above, with non-embossed toilet paper and toilet rolls that are mass-produced and sized to fit into paper holders, it has been difficult to achieve both resistance to crushing of the paper tube 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 consideration of the above circumstances, and aims to provide a toilet roll in which unembossed toilet paper is wound to a certain roll diameter, in which the paper tube of the core is not easily crushed and the toilet paper at the outer tip of the roll is not easily stuck to the toilet paper at the center of the roll. [Means for solving the problem]

[0015] The inventors conducted extensive research and found that, in a toilet roll in which one ply of toilet paper not embossed is wound around a paper tube, the roll winding length, winding diameter, roll density, and basis weight of one ply of toilet paper are each within a predetermined numerical range, the toilet paper is perforated at a predetermined interval, the bond part / cut part ratio of the perforation and the tab strength of the area including the perforation are each within a predetermined numerical range, and further, the apparent basis weight, mass, and hardness of the paper tube are each within a predetermined numerical range, thereby making it possible to obtain a toilet roll in which the core paper tube is less likely to be crushed and the toilet paper at the outer end of the roll is less likely to stick to the toilet paper at the center of the roll, and thus completing the present invention. That is, the present invention provides the following.

[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 core into a roll, the roll length being 130 m or more and 230 m or less, the roll diameter being 100 mm or more and 143 mm or less, and the roll density being 0.15 g / cm 3 More than 0.33g / cm 3 The winding density is 1.1m / cm 2 More than 2.0m / cm 2 The toilet paper has a basis weight of 13 g / m 2 More than 22g / m 2 The 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 bonded parts / cut parts of the perforations (bond-cut ratio) is 40% or more and 70% or less, the tab strength of the region including the perforations is 2.5 N / 75 mm or more and 9.0 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 between 4.0 g and 6.0 g. The paper tube is placed horizontally on a hard table so that the axis is horizontal, and a compression element (area 2.0 cm2) 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 at this time is T0, and the pressure is 250gf / cm 2 The indentation depth at 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) A second aspect of the present invention is the toilet roll according to (1), characterized in that the toilet paper has a tensile strength in the MD direction when dry based on JIS P 8113, DMDT, of 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 toilet paper has a tensile strength in the CD direction (DCDT) when dry based on JIS P 8113 of 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) A fifth aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the paper thickness of the toilet paper is 0.7 mm or more per 10 sheets and 1.7 mm or less per 10 sheets.

[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. Effect of the Invention

[0023] According to the present invention, it is possible to provide a toilet roll in which non-embossed toilet paper is wound up, in which the paper tube of the core is not easily crushed, and the toilet paper at the outer tip of the roll is not easily stuck to the toilet paper in the center of the roll. [Brief description of the drawings]

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

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

[0027] <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 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 a sheet) 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 (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 rolled up 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 130 m or more and 230 m or less. If the roll length is less than 130 m, the roll length is too short, and as a result, the roll diameter DR described below becomes too small. If the roll length exceeds 230 m, the roll diameter DR described below becomes too large, making it difficult to attach the toilet roll 1 to a paper holder. The lower limit of the roll length of the toilet roll 1 is preferably 138 m or more, and more preferably 140 m or more, and the upper limit is preferably 223 m or less, and more preferably 220 m or less.

[0029] (Roll diameter) In addition, 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 length will be too short if the basis weight and paper thickness do not change. If the roll diameter DR exceeds 143 mm, it will be 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 108 mm or more, and more preferably 115 mm or more, and the upper limit is preferably 136 mm or less, and more preferably 129 mm or less.

[0030] To determine the roll length, measure the length of 10 sheets of toilet paper 1x between perforations 1c 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 1.5m 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 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.

[0031] (seat length and width) Furthermore, the length between the perforations 1c (the sheet length of the toilet paper 1x) has a lower limit of preferably 100 mm or more, more preferably 121 mm or more, and even more preferably 144 mm or more, and an upper limit of preferably 235 mm or less, more preferably 213 mm or less, and even more preferably 190 mm or less. 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 having the sheet length and sheet width within the above numerical ranges, when using the toilet roll 1 of the present application, the toilet paper 1x at the outer end 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, making it suitable for use as a single ply.

[0032] (Roll weight) 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, the roll diameter DR will be too small and the roll length will be too short if the basis weight does not change. If the roll mass is more than 450 g, the roll length will be long if the basis weight does not change, and the roll diameter DR will be too large, making it difficult to attach to a paper holder. The lower limit of the roll mass of the toilet roll 1 is more preferably 260 g or more, and even more preferably 270 g or more, and the upper limit is more preferably 420 g or less, and even more preferably 390 g or less. The roll mass in the above numerical range is the mass of one roll per 114 mm of roll width not including 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, the roll volume will be large if the roll weight remains unchanged, resulting in a large roll diameter DR and making it difficult to attach the toilet roll 1 to a paper holder. 3 If the roll weight does not change when the roll exceeds this value, the roll volume will be reduced, 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 content is 0.20 g / cm or more. 3 More preferably, the upper limit is 0.28 g / cm. 3 It is preferable that the density is 0.26 g / cm or less. 3 It is more preferable that:

[0034] 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 1d) per 116 mm of roll width 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 It becomes. In addition, when the toilet roll 1 does not have a paper tube 1d, the diameter of the central hole is regarded as the core outer diameter (the outer diameter DI of the paper tube 1d).

[0035] (winding density) Furthermore, the winding density of the 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 roll diameter DR will be large if the winding length does not change, making it difficult to attach the toilet roll 1 to the paper holder. 2 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 winding density of toilet roll 1 is 1.2 m / cm 2 It is preferable that the thickness is 1.3m / cm or more. 2 More preferably, the upper limit is 1.9 m / cm 2 It is preferable that the thickness is less than 1.8m / cm 2 It is more preferable that:

[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 (winding diameter DR) part of the roll - (cross-sectional area of ​​the outer diameter DI part of the cardboard tube 1d)}. For example, in the case of a winding length of 150 m, 1 ply, winding diameter DR of 121 mm, and outer diameter DI of the cardboard tube 1d of 40 mm, the winding density = (150 m x 1) ÷ {3.14 x (121 mm ÷ 10) 2 -3.14×(40mm÷10) 2}=1.5m / cm2 It 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 use as a roll product. If the outer diameter DI exceeds 48 mm, and the winding length and winding density remain unchanged, the winding diameter DR will become too large as a result, making it difficult to attach the toilet roll 1 to 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 tubes 1d of four toilet rolls 1 are measured, and the measurement results are averaged.

[0038] The mass of the cardboard tube 1d is 4.0g or more and 6.0g or less. If the mass of the cardboard tube 1d is less than 4.0g, the cardboard tube 1d is easily crushed. If the mass of the cardboard tube 1d is more than 6.0g, the cardboard tube 1d becomes too hard, the blade used for cutting is easily deteriorated, and the cardboard tube 1d is 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 5.7 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 114 mm of roll width, not including the paper core 1d (core) in 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.

[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 core 1d is 200 g / m 2 If the apparent basis weight of the paper tube 1d is less than 500 g / m2 If it exceeds this value, the paper tube 1d becomes too hard, the blade used for cutting becomes easily deteriorated, and the paper tube 1d becomes easily crushed. The apparent basis weight of the paper tube 1d is 250 g / m 2 It is preferable that the thickness is 300 g / m or more. 2 More preferably, the upper limit is 450 g / m 2 It is preferable that the thickness is less than 400 g / m 2 It is more preferable that the apparent basis weight of the cardboard core 1d is equal to or less than 100 g / m2. The reason why it is described as the 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 stacked together.

[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 becomes easily crushed. If the hardness of the paper tube 1d exceeds 2.8 mm, the paper tube 1d becomes too hard, the blade used for cutting becomes easily deteriorated, and the paper tube 1d becomes easily crushed. The hardness of the cardboard tube 1d has a lower limit of preferably 1.7 mm or more, more preferably 1.8 mm or more, and an upper limit of 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 laid horizontally on a hard table so that the axis is horizontal, and a compression tool (area 2.0 cm2) is placed on 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 exerted by the compression element is 0.5 gf / cm 2 The indentation depth at this time is T0, and the pressure is 250gf / cm 2 The indentation depth at 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, 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. In order to obtain the target quality, the NBKP (softwood bleached kraft pulp) content is preferably 5% by mass to 55% by mass, more preferably 15% by mass to 45% by mass, and even more preferably 20% by mass to 35% by mass, and the LBKP (hardwood bleached kraft pulp) content is preferably 45% by mass to 95% by mass, more preferably 55% by mass to 85% by mass, and even more preferably 65% ​​by mass to 80% by mass.

[0042] (Basic weight) The basis weight of one ply of the 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 piece 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 end of the roll will tend to stick to the toilet paper 1x at the center of the roll. 2 If the thickness exceeds this value, the toilet paper 1x will be too stiff when wound up, 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 13.5 g / m 2 It is preferable that the thickness is 14 g / m or more. 2 More preferably, the upper limit is 21.5 g / m or more. 2 It is preferable that the thickness is less than 21 g / m 2 It is more preferable that the basis weight of the toilet paper 1x 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 is too thin, and the toilet paper 1x at the outer end of the roll is likely 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 as a result, making it difficult to attach the toilet roll 1 to a paper holder. The lower limit of the thickness of the 10 plies of toilet paper 1x is more preferably 0.8 mm / 10 sheets or more, and even more preferably 0.9 mm / 10 sheets or more. The upper limit is more preferably 1.6 mm / 10 sheets or less, and even more preferably 1.5 mm / 10 sheets or less. The thickness of toilet paper 1x 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 and a gauge diameter of 30 mm. The sample is placed between the gauge and the measurement table, and the gauge is read when the gauge is lowered at a speed of 1 mm per second or less. Then, 10 sets of 1-ply toilet paper 1x are stacked, and measurements are taken for 10 sheets, which is calculated as the thickness of 10 plies. The measurement is also repeated 10 times (measure 10 different places, rather than measuring the same place 10 times), and the average of the measurement results is taken as the final paper thickness.

[0044] (specific volume) In addition, the specific volume of the 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 end of the roll will tend to stick to the toilet paper 1x at the center of the roll. 3If the density exceeds 1 / g, the winding density is increased to keep the winding diameter DR within the specified range, so that the toilet roll 1 becomes too stiff when the toilet paper 1x is wound, and as a result, the paper core 1d becomes easily crushed when cut. The specific volume of one piece of toilet paper has a lower limit of 4.1 cm 3 / g or more is more preferable, and 4.6 cm 3 More preferably, the upper limit is 5.5 cm / g or more. 3 / g or less is more preferable, and 5.0 cm 3 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:

[0045] (DMDT and DCDT) The tensile strength in the MD direction of the toilet paper 1x according to one embodiment of the present invention when dry based on JIS P 8113, DMDT (Dry Machine Direction Tensile Strength), is preferably 2.0 N / 25 mm or more and 8.5 N / 25 mm or less. The tensile strength in the CD direction when dry, DCDT (Dry Cross Direction Tensile Strength), is preferably 0.7 N / 25 mm or more and 3.0 N / 25 mm or less. If the DMDT is less than 2.0 N / 25 mm or the DCDT is less than 0.7 N / 25 mm, the toilet paper 1x is too soft, and the toilet paper 1x at the outer end of the roll is likely to stick to the toilet paper 1x at the center of the roll. If the DMDT exceeds 8.5 N / 25 mm or the DCDT exceeds 3.0 N / 25 mm, the toilet paper 1x becomes too hard when wound up, and as a result, the paper tube 1d is likely to be crushed when cut.

[0046] The lower limit of the DMDT is more preferably 3.3 N / 25 mm or more, and even more preferably 4.6 N / 25 mm or more, and the upper limit is more preferably 7.2 N / 25 mm or less, and even more preferably 5.9 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.

[0047] (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.

[0048] At this time, the pitch of the perforations 1c (the distance between the perforations 1c in the longitudinal direction) is 100 mm or more and 235 mm or less. If the pitch is less than 100 mm, the perforations 1c will be easily torn, making it difficult to use as a roll product. If the pitch exceeds 235 mm, 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 121 mm or more, and even more preferably 144 mm or more, and the upper limit is more preferably 213 mm or less, and even more preferably 190 mm or less. The pitch of perforation 1c is measured with a ruler.

[0049] In addition, the ratio of the bonded portion to the cut portion of the perforation 1c (bond cut rate) is 40% or more and 70% or less. If the bond cut rate is less than 40%, the perforation 1c will be easily torn, making it difficult to use as a roll product. If the bond cut rate exceeds 70%, it becomes 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 45% or more, more preferably 50%, and is preferably 65% ​​or less, more preferably 60% or less. The bond cut rate of perforation 1c is calculated by ((A / B) x 100(%)), where A is the bond width of perforation 1c and B is the cut width of perforation 1c.

[0050] Furthermore, the tab strength of the toilet paper 1x in the area including the perforation 1c is 2.5N / 75mm or more and 9.0N / 75mm or less. If the tab strength is less than 2.5N / 75mm, the perforation 1c is easily torn, making it difficult to use as a roll product. If the tab strength exceeds 9.0N / 75mm, air is less likely 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 is more likely to stick to the toilet paper 1x in the center of the roll. The tab strength in the region including the perforation 1c has a lower limit of preferably 3.7 N / 75 mm or more, more preferably 5.9 N / 75 mm or more, and an upper limit of preferably 7.8 N / 75 mm or less, more preferably 6.6 N / 75 mm or less.

[0051] <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, and (2) roll winding process. 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.

[0052] As described above, according to this embodiment, in a toilet roll 1 wound with unembossed toilet paper 1x, it is possible to provide a toilet roll 1 in which the core paper tube 1d is less likely to be crushed and 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. EXAMPLES

[0053] 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.

[0054] Under each of the conditions shown in Table 1, one-ply toilet paper and toilet rolls of Examples 1 and 2 and Comparative Examples 1 and 2 were produced and evaluated as follows. 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 evaluated according to the standards or measurement methods described above.

[0055] (Paper tube crushed) Thirty test subjects visually inspected the manufactured toilet rolls and evaluated whether the paper tubes were crushed. The test subjects rated the paper tubes on a four-point scale according to the number of test subjects who determined that the paper tubes were not crushed. ◎: More than 28 people evaluated that the paper tube was not crushed. 〇: The number of monitors who evaluated that the paper tube was not crushed was between 26 and 27. △: The number of monitors who evaluated that the paper tube was not crushed was between 23 and 25 people. ×: The number of monitors who evaluated that the paper tube was not crushed was 22 or less.

[0056] (Toilet paper sticking (toilet paper sticking at the outer edge of the roll) Thirty test subjects rated the toilet paper for its difficulty in sticking together (how easily the toilet paper (the outer tip of the roll) sticks to the toilet paper in the center of the toilet roll) when it was used. The test subjects rated the toilet paper on a four-point scale based on the number of test subjects who judged that the toilet paper did not stick together when they pulled it out of the roll. ◎: More than 28 people evaluated that the toilet paper did not stick together. 〇: The number of monitors who evaluated that the toilet paper did not stick together was between 26 and 27 people. △: The number of monitors who evaluated that the toilet paper did not stick together was between 23 and 25 people. ×: The number of monitors who evaluated that the toilet paper did not stick together was 22 or less.

[0057] Table 1 shows the conditions and evaluation results for each of the examples and comparative examples. [Table 1]

[0058] From the above, it was at least confirmed that, according to this embodiment, in a toilet roll wound with toilet paper that is not embossed, a toilet roll can be obtained in which the paper tube of the core is less likely to be crushed and the toilet paper at the outer tip of the roll is less likely to stick to the toilet paper in the center of the roll. [Explanation of symbols]

[0059] 1 toilet roll 1a Roll surface 1b Back side of roll 1c Perforation 1d paper tube 1e The edge of the outermost 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 shape, 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 ratio) is 40% or more and 70% or less, In the toilet paper, the tab strength of the region including the perforation is 2.5 N / 75 mm or more and 9.0 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 tool (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 tool was 0.5 gf / cm ２ The indentation depth at the time T ０ , pressure is 250 gf / cm ２ The indentation depth at the time 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, characterized in that 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, characterized in that 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, characterized in that the toilet paper has a paper thickness of 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 elasticity is 1 / g or less.

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

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