Toilet roll

Abstract

To provide a toilet roll obtained by winding toilet tissue paper to which embossment is not added and knurling is applied, where ply is hardly peeled and the toilet tissue paper has excellent decorativeness.SOLUTION: There is provided a toilet roll obtained by winding toilet tissue paper obtained by laminating a sheet, to which embossment is not added, in two plies onto a paper tube in a roll state. The toilet tissue paper further receives knurling applied nearly linearly in the longitudinal direction. The knurling's width is equal to or longer than 1 mm and equal to or shorter than 10 mm. The knurling has pushing portions, each of which has an area equal to or larger than 0.04 mm2 and equal to or smaller than 2.0 mm2. A ratio of the area of pushing portions in a regular square whose one side has a width of the knurling in a knurling part is equal to or larger than 2% and equal to or smaller than 70%.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a toilet roll having two plies of knurled toilet paper wound thereon. [Background technology]

[0002] Toilet rolls made by winding up long lengths of toilet paper (hereinafter also referred to as long toilet rolls) can reduce storage space and the number of times the roll needs to be replaced, and can also reduce packaging materials and transportation volume.

[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] Incidentally, in order to stabilize the roll diameter and texture, typical toilet rolls are embossed on the toilet paper (hereinafter also referred to as the sheet), and knurled (also called ply embossing, edge embossing, or contact embossing) is applied to prevent ply peeling.

[0005] As a prior art document for a device for performing such knurling, for example, Patent Document 1 describes an edge embossing roll that has numerous protrusions on its peripheral surface, and while rotating, presses its peripheral surface against a plurality of stacked sheets of toilet paper base paper to impart edge embossing corresponding to the arrangement pattern of the protrusions, thereby performing ply joining of a plurality of toilet paper base papers, the edge embossing roll having a row of protrusions in which the protrusions are arranged at predetermined intervals along the direction of movement of the peripheral surface, and the row of protrusions is arranged at predetermined intervals in the width direction along the direction of the rotation axis of the edge embossing roll. The edge embossing roll disclosed is characterized in that a plurality of convex portions are arranged at regular intervals, the rows of convex portions located at both ends in the width direction are positioned such that the top faces of the convex portions that are closest to each other in the circumferential movement direction in those rows partially overlap in the circumferential movement direction, and the convex portions have a rectangular top face shape having a first side parallel to the width direction and a second side that is longer than the first side, and third and fourth sides connecting both ends of the first and second sides, with the first side being located on the side that comes into contact with the paper surface sooner and the second side being located on the side that comes into contact with the paper surface later.

[0006] Patent Document 2 also describes a toilet roll in which two sheets are overlapped to form a two-ply toilet paper roll, the roll length of which is 33 m or more and 100 m or less, the roll diameter is 100 mm or more and 134 mm or less, and the basis weight per sheet is 11 g / m 2 More than 16g / m 2 The TS750 outer surface, which is the intensity of the first maximum peak in the spectrum seen from the low frequency side when measured by the vibration sensor, is 12 dBV or less. The TS750 outer surface is measured by measuring the vibration of the sample stage using a tissue softness measuring device TSA. A bladed rotor is pressed from above with a pressure of 100 mN against a sample of toilet paper placed on the sample stage with the outer side of the roll facing up, and then the sample stage is rotated at a speed of 2.0 revolutions per second. 2 rms over 30dBV 2The disclosed toilet roll is characterized in that the TS750 inner surface, which is the intensity of the first maximum peak in the spectrum seen from the low frequency side when a tissue softness measuring device TSA is used to measure the vibration of a toilet paper sample placed on a sample stage with the inner surface of the toilet roll facing up, by pressing a bladed rotor from above with a pressing pressure of 100 mN and then rotating the sample stage at a rotation speed of 2.0 revolutions per second, the TS750 inner surface being greater than the TS750 outer surface, and the toilet paper has a first bonding embossed portion for defining a bonding area where two sheets come into close contact with each other, and a second bonding embossed portion which, together with the first bonding embossed portion, defines a bonding area where the two sheets come into close contact with each other and bonds the two sheets together with the first bonding embossed portion. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-063866 A [Patent Document 2] JP 2023-106067 A Summary of the Invention [Problem to be solved by the invention]

[0008] Non-embossed toilet paper has fewer surface irregularities when wound into a roll, allowing for a higher winding density and making it possible to produce a long toilet roll.

[0009] However, among non-embossed toilet rolls, those with two plies of toilet paper wound up tend to have the plies peel off during use, causing the roll to turn over when in use, or causing the perforations to become misaligned when cut away from the perforations. In order to prevent such peeling of the ply, knurling can be applied to the sheet, but in the case of non-embossed toilet paper, the knurling is rather noticeable, which causes a problem of inferior aesthetic appeal.

[0010] For the reasons mentioned above, with toilet paper and toilet rolls that are not embossed but are knurled, it is difficult to achieve both resistance to peeling of the plies and the cosmetic appeal of the toilet paper.

[0011] The present invention has been made in view of the above circumstances, and aims to provide a toilet roll which is made by winding up toilet paper that is not embossed but has been knurled, in which the plies are unlikely to peel off and which also has excellent cosmetic properties. [Means for solving the problem]

[0012] The inventors have conducted extensive research and have found that, in a toilet roll in which two plies of toilet paper not having embossing are wound around a paper tube, the roll length and diameter of the roll and the basis weight of one ply of toilet paper are each within a predetermined numerical range, the toilet paper is perforated at equal intervals, the tab strength of the area including the perforations in the two plies and the tab strength of the area including the perforations in the one ply on the roll surface side are each within a predetermined numerical range, and further, knurling is applied in a substantially linear manner in the longitudinal direction of the toilet paper, and the knurling width, the area per pressed part, and the proportion of the pressed part in a square in the knurling part whose one side is the knurling width are each within a predetermined numerical range, thereby making it possible to produce a toilet roll in which the plies are less likely to peel off and which has excellent cosmetic properties, and have completed the present invention. That is, the present invention provides the following.

[0013] (1) The first aspect of the present invention is a toilet roll in which toilet paper, which is made by laminating two plies of non-embossed sheets, is wound into a roll on a paper tube, the roll length is 45 m to 150 m, the roll diameter is 100 mm to 143 mm, and the basis weight of one ply of the toilet paper is 11 g / m 2 More than 20g / m 2 The toilet paper has perforations extending in the width direction and arranged at equal intervals in the longitudinal direction, and the tab strength of the area including the perforations in two plies of the toilet paper is 2.5 N / 75 mm or more and 9.0 N / 75 mm or less, and the tab strength of the area including the perforations in one ply on the roll surface side is 1.25 N / 75 mm or more and 4.5 N / 75 mm or less, and the toilet paper is further knurled in a substantially linear manner in the longitudinal direction, the width of the knurling is 1 mm or more and 10 mm or less, the knurling has a pressed-in portion, and the area of ​​each pressed-in portion is 0.04 mm. 2 More than 2.0mm 2 The toilet roll is characterized in that the ratio of the pressed-in portions within a square in the knurling portion, one side of which is the width of the knurling ((area of ​​one pressed-in portion x number of pressed-in portions within a square in the knurling portion, one side of which is the width of the knurling) / area of ​​a square in the knurling portion, one side of which is the width of the knurling x 100) is 2% or more and 70% or less.

[0014] (2) The second aspect of the present invention is the toilet roll according to (1), wherein the winding density of the roll is 1.1 m / cm 2 More than 2.0m / cm 2 It is characterized in that:

[0015] (3) A third aspect of the present invention is the toilet roll according to (1) or (2), wherein the roll density of the roll is 0.13 g / cm 3 More than 0.33g / cm 3 It is characterized in that:

[0016] (4) A fourth aspect of the present invention is the toilet roll according to (1) or (2), wherein the paper tube is laid horizontally on a hard table so that the axis of the paper tube is horizontal, and a compression element (area 2.0 cm2) is placed in 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 cardboard tube, the hardness of the cardboard tube is 1.6 mm or more and 2.8 mm or less.

[0017] (5) A fifth 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 MD direction when dry based on JIS P 8113, DMDT, of 2.5 N / 25 mm or more and 7.5 N / 25 mm or less.

[0018] (6) The sixth 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 when dry (DCDT) according to JIS P 8113 of 0.7 N / 25 mm or more and 2.5 N / 25 mm or less.

[0019] (7) A seventh 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 200 g or more and 400 g or less.

[0020] (8) An eighth 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 0.4 mm or more per 10 sheets and 1.3 mm or less per 10 sheets.

[0021] (9) The ninth aspect of the present invention is the toilet roll according to (1) or (2), wherein the specific volume of the toilet paper is 3.0 cm 3 / g or more 7.0cm 3 / g or less.

[0022] (10) A tenth 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.

[0023] (11) The eleventh aspect of the present invention is the toilet roll according to (1) or (2), wherein the apparent basis weight of the paper core is 200 g / m 2 More than 500g / m 2 It is characterized in that: Effect of the Invention

[0024] According to the present invention, it is possible to provide a toilet roll which is produced by winding up toilet paper that is not embossed but has been knurled, in which the plies are unlikely to peel off and which also has excellent cosmetic properties. [Brief description of the drawings]

[0025] [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 perspective view showing the appearance of the toilet roll in FIG. 1 from another side.

[0026] 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.

[0027] 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.

[0028] <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 toilet paper 1x, which is made by laminating two plies of non-embossed sheets, is wound into a roll around a paper tube 1d, which serves as a core. The toilet paper 1x (hereinafter also simply referred to as the sheet) has perforations 1c that extend in the width direction and are arranged at equal intervals 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.

[0029] (Volume length) The roll length of the toilet roll 1 is 45 m or more and 150 m or less. If the roll length is less than 45 m, the roll length is too short, and in order to achieve a constant roll diameter DR, the knurling 1f marks remain strong, which results in poor cosmetic appearance. As a result, the roll diameter DR, which will be described later, becomes too small. If the roll length exceeds 150 m, the knurling 1f is crushed, which makes the ply more likely to peel off. Also, the roll diameter DR, which will be described later, becomes too large. The lower limit of the roll length of the toilet roll 1 is preferably 63 m or more, and more preferably 80 m or more, and the upper limit is preferably 133 m or less, and more preferably 115 m or less.

[0030] (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 diameter DR is too small, so that the knurling 1f is crushed to achieve a constant roll length, making the ply more likely to peel off. Alternatively, the roll length becomes too short as a result. If the roll diameter DR exceeds 143 mm, the knurling 1f leaves a strong mark, resulting in poor cosmetic appearance. In addition, the roll diameter DR becomes too large. The lower limit of the roll diameter DR of the toilet roll 1 is preferably 107 mm or more, and more preferably 114 mm or more, and the upper limit is preferably 136 mm or less, and more preferably 129 mm or less.

[0031] 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 1.8m and there are 200 sheets of toilet paper 1x, then the roll length is 1.8m x (200 / 10) = 36m. 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.

[0032] (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 114 mm or more, more preferably 134 mm or more, and even more preferably 154 mm or more.The upper limit is preferably 235 mm or less, more preferably 215 mm or less, and even more preferably 195 mm or less. 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 110 mm or more, and the upper limit is preferably 120 mm or less, more preferably 118 mm or less, and even more preferably 115 mm or less. By having the sheet length and sheet width each fall within the above numerical range, the area used when using the toilet roll 1 of the present invention is appropriate.

[0033] (Roll weight) The roll mass of the toilet roll 1 is preferably 200 g or more and 400 g or less. If the roll mass is less than 200 g, the result is that the winding diameter DR is too small or the winding length is too short. If the winding length is short and the winding diameter DR is within a certain range, the knurling 1f marks will remain, resulting in poor cosmetic appearance. If the roll mass exceeds 400 g, the result is that the winding diameter DR is too large. If the winding diameter DR is within a certain range, the knurling 1f will be crushed and the ply will be easily peeled off. The lower limit of the roll mass of the toilet roll 1 is more preferably 233 g or more, and even more preferably 267 g or more, and the upper limit is more preferably 367 g or less, and even more preferably 333 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.

[0034] (Roll density) The roll density of toilet roll 1 is 0.13 g / cm 3 More than 0.33g / cm 3 It is preferable that the roll density is 0.13 g / cm or less. 3 If the roll density is less than 0.33 g / cm, the roll diameter DR will be large, knurling marks 1f will remain, and the cosmetic appearance will be poor. In addition, it will be difficult to attach the toilet roll 1 to a paper holder. 3 If the thickness exceeds this value, the toilet roll 1 will be tightly wound, the knurling 1f will be crushed, and the ply will be easily peeled off. Also, the paper core 1d will be easily crushed when cutting. The minimum roll density of toilet roll 1 is 0.16 g / cm 3 More preferably, it is 0.20 g / cm or more.3 The upper limit is preferably 0.30 g / cm or more. 3 More preferably, it is 0.26 g / cm or less. 3 It is even more preferable that:

[0035] The roll density is expressed as (roll mass) ÷ (roll volume). The roll mass is the mass of the toilet roll 1 per 114 mm of roll width. The roll volume 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 paper core 1d)] x roll width (converted per 114 mm). For example, if the roll mass (excluding the paper core 1d) per 115 mm of roll width is 312 g, the winding diameter DR is 116 mm, and the outer diameter DI of the paper core 1d is 39 mm, the roll density = 0.28 g / cm 3 In addition, if the toilet roll 1 does not have a paper core, the diameter of the center hole is regarded as the core outer diameter.

[0036] (winding density) Furthermore, the winding density of the toilet roll 1 is 1.1 m / cm 2 More than 2.0m / cm 2 It is preferable that the winding density is 1.1 m / cm or less. 2 If the winding density is less than 2.0 m / cm, the roll diameter DR will be large, the knurling 1f will leave marks, and the cosmetic appearance will be poor. In addition, the toilet roll 1 will be difficult to attach to a paper holder. 2 If the thickness exceeds this value, the toilet roll 1 will become tightly wound, resulting in the knurling 1f being crushed and the ply becoming more susceptible to peeling. The minimum winding density of toilet roll 1 is 1.25 m / cm 2 More preferably, it is 1.40 m / cm or more. 2 More preferably, the upper limit is 1.85 m / cm. 2 More preferably, it is 1.70 m / cm or less. 2 It is even more preferable that:

[0037] The winding density is expressed as (winding length × 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 91 m, 1 ply, winding diameter DR of 119 mm, and outer diameter DI of the cardboard tube 1d of 39 mm, the winding density = (91 m × 1) ÷ {3.14 × (119 mm ÷ 10) 2 -3.14×(39mm÷10) 2}=1.82m / cm 2 It becomes.

[0038] (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 becomes difficult to use as a roll product. If the outer diameter DI exceeds 48 mm, the winding diameter DR will become too large as a result. 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 44 mm or less, and even more preferably 40 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.

[0039] The mass of the paper tube 1d is preferably 4.0g or more and 6.0g or less. If the mass of the paper tube 1d is less than 4.0g, the mass of the toilet roll 1 will be low, and when the toilet paper 1x is cut at the perforations 1c, the paper tube 1d will be crushed and the cosmetic properties will be poor. If the mass of the paper tube 1d is more than 6.0g, the paper tube 1d will be too hard, making it difficult to cut the toilet paper 1x cleanly when cutting, and the cosmetic properties will be poor. The lower limit of the mass of the cardboard tube 1d is more preferably 4.3 g or more, and even more preferably 4.7 g or more, and the upper limit is more preferably 5.7 g or less, and even more preferably 5.3 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.

[0040] The apparent basis weight of the paper tube 1d is 200 g / m 2 More than 500g / m 2 It is preferable that the apparent basis weight of the paper core 1d is 200 g / m or less. 2 If the apparent basis weight of the paper tube 1d is less than 500 g / m, the paper tube 1d will be crushed during cutting, resulting in poor cosmetic properties. 2 If it exceeds this value, the paper tube 1d becomes too hard, making it difficult to cut the toilet paper 1x neatly when cutting, resulting in poor cosmetic appearance. The apparent basis weight of the paper tube 1d is 250 g / m 2 More preferably, it is 300 g / m or more. 2 The upper limit is more preferably 450 g / m or more. 2 More preferably, it is 400 g / m or less. 2 It is more preferable that the apparent basis weight of the cardboard core 1d is not more 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.

[0041] Furthermore, it is preferable that 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 too hard, making it difficult to cut the toilet paper 1x neatly when cutting, resulting in poor cosmetic properties. If the hardness of the paper tube 1d is more than 2.8 mm or less, the paper tube 1d becomes too hard, causing the paper tube 1d to be crushed when cut, resulting in poor cosmetic properties. The hardness of the cardboard tube 1d has a lower limit of preferably 1.8 mm or more, and even more preferably 2.0 mm or more, and an upper limit of preferably 2.6 mm or less, and even more preferably 2.4 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.

[0042] <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.

[0043] (Basic weight) The basis weight of one ply of the toilet paper 1x according to one embodiment of the present invention is 11 g / m 2 More than 20g / m 2 The basis weight of one piece of toilet paper is 11 g / m 2 If the basis weight of the toilet paper 1x is less than 20 g / m, it becomes difficult to apply knurling 1f to the toilet paper 1x, and the ply is easily peeled off.2 If it exceeds this, the marks of the first knurling will remain, resulting in inferior cosmetic quality. The minimum basis weight of one ply of toilet paper is 12.5 g / m 2 It is preferable that the thickness is 14.1 g / m or more. 2 More preferably, the upper limit is 18.5 g / m or more. 2 Preferably, the thickness is 17.0 g / m or less. 2 It is more preferable that the basis weight of the toilet paper 1x is measured in accordance with JIS P 8124.

[0044] (paper thickness) The paper thickness (for 10 sheets) of the toilet paper 1x according to one embodiment of the present invention is preferably 0.4 mm / 10 sheets or more and 1.3 mm / 10 sheets or less. If the paper thickness is less than 0.4 mm / 10 sheets, the toilet paper 1x is too thin, making it difficult to apply knurling 1f and making the ply more likely to peel off. If the paper thickness exceeds 1.3 mm / 10 sheets, the toilet paper 1x becomes too thick, resulting in the knurling 1f described below being more noticeable and poor cosmetic quality. The lower limit of the thickness of the 10 plies of toilet paper 1x is more preferably 0.5 mm / 10 sheets or more, and even more preferably 0.6 mm / 10 sheets or more. The upper limit is more preferably 1.2 mm / 10 sheets or less, and even more preferably 1.1 mm / 10 sheets or less. The thickness of the 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 measuring table, and the gauge is read when the gauge is lowered at a speed of 1 mm per second or less. Five sets of 2-ply toilet paper 1x are then stacked, and measurements are taken for 10 sheets, which is calculated as the thickness of the 10-ply paper. 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.

[0045] (specific volume) In addition, the specific volume of the toilet paper 1x according to one embodiment of the present invention is 3.0 cm 3 / g or more 7.0cm 3 / g or less. 3 If the specific volume is less than 7.0 cm3 / g, it becomes difficult to perform knurling 1f, and the ply is likely to peel off. 3 If it exceeds / g, the knurling marks of 1f will remain, resulting in poor cosmetic appearance. The specific volume of one piece of toilet paper has a lower limit of 3.5 cm 3 / g or more is more preferable, and 4.0 cm 3 The upper limit is preferably 6.5 cm / g or more. 3 / g or less is more preferable, and 6.0 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:

[0046] (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 2.5 N / 25 mm or more and 7.5 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 2.5 N / 25 mm or less. If the DMDT is less than 2.5 N / 25 mm or the DCDT is less than 0.7 N / 25 mm, the toilet paper 1x is too soft, the knurling 1f marks remain, and the cosmetic properties are poor. If the DMDT exceeds 7.5 N / 25 mm or the DCDT exceeds 2.5 N / 25 mm, the toilet paper 1x becomes too hard, making it difficult to perform the knurling 1f, and the ply is easily peeled off.

[0047] The lower limit of the DMDT is more preferably 3.3 N / 25 mm or more, and even more preferably 4.2 N / 25 mm or more, and the upper limit is more preferably 6.7 N / 25 mm or less, and even more preferably 5.7 N / 25 mm or less. The lower limit of DCDT is more preferably 1.0 N / 25 mm or more, and even more preferably 1.3 N / 25 mm or more, and the upper limit is more preferably 2.2 N / 25 mm or less, and even more preferably 1.9 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 that extend in the width direction and are arranged at equal intervals in the longitudinal direction.

[0049] At this time, the pitch of the perforations 1c (the distance between the perforations 1c in the longitudinal direction) is preferably 114 mm or more and 235 mm or less. If the pitch is less than 114 mm, the perforations 1c tend to tear or become difficult to wind into a roll, making it difficult to use as a roll product. In addition, the number of perforations 1c increases, resulting in poor aesthetics. If the pitch exceeds 235 mm, it becomes difficult for air to enter between the sheets through the cuts of the perforations 1c, resulting in the sheet back surface 1b and the toilet roll 1 sticking together, and the sheet front surface 1a and the ply tending to peel off from each other. The lower limit of the pitch of the perforations 1c is more preferably 134 mm or more, and even more preferably 154 mm or more, and the upper limit is more preferably 215 mm or less, and even more preferably 195 mm or less. The pitch of the perforation 1c is measured using a ruler.

[0050] Furthermore, in the toilet paper 1x, the tab strength of the area including the perforation 1c in the two plies 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 becomes easily torn or it becomes difficult to wind it into a roll, making it difficult to use as a roll product. If the tab strength exceeds 9.0N / 75mm, it becomes difficult for air to enter between the sheets through the cut part of the perforation 1c, and as a result, the toilet paper 1x sticks to each other, making it easy for plies to peel off. In addition, the recoil of cutting makes it easy for plies to peel off. The lower limit of the tab strength in the region including the perforation 1c in the two plies is preferably 3.6 N / 75 mm or more, more preferably 4.7 N / 75 mm or more, and the upper limit is preferably 7.9 N / 75 mm or less, more preferably 6.8 N / 75 mm or less.

[0051] Furthermore, in the toilet paper 1x, the tab strength of the region including the perforation 1c in one ply on the roll surface 1a side is 1.25 N / 75 mm or more and 4.5 N / 75 mm or less. If the tab strength of one ply on the roll surface 1a side is less than 1.25 N / 75 mm, the perforation 1c becomes easily torn or it becomes difficult to wind it into a roll, making it difficult to use as a roll product. If the tab strength of one ply on the roll surface 1a side exceeds 4.5 N / 75 mm, it becomes difficult for air to enter between the sheets through the cut part of the perforation 1c, and as a result, the toilet paper 1x sticks to each other, making it easy for ply peeling to occur. In addition, ply peeling is easy to occur in reaction to cutting the perforation 1c. The tab strength in the region including the perforation 1c in one ply on the roll surface 1a side is preferably 1.75 N / 75 mm or more in lower limit, more preferably 2.30 N / 75 mm or more in upper limit, preferably 3.95 N / 75 mm or less, more preferably 3.40 N / 75 mm or less in upper limit. The tab strength is measured in accordance with JIS P 8113.

[0052] (Knurling) As shown in Fig. 2, in the toilet roll 1 according to one embodiment of the present invention, the toilet paper 1x further has knurling 1f formed in a substantially linear manner in the longitudinal direction. The number of knurlings 1f is not particularly limited, but it is preferable that two knurlings are formed in the longitudinal direction of the toilet paper 1x, as shown in Fig. 2. In addition, the position of the knurling 1f is not necessarily the same depending on the cutting position, so there is no particular limit to the position, but it is preferable that the knurlings are formed within 40 mm from both ends of the roll.

[0053] In this case, the width of the knurling 1f is 1 mm or more and 10 mm or less. If the width is less than 1 mm, the knurling 1f is too close to each other, weakening the adhesion between the plies of the toilet paper 1x, and as a result, the plies are more likely to peel off. If the width exceeds 10 mm, the knurling 1f is too close to the edge of the toilet paper 1x, making it more noticeable and less aesthetically pleasing. The lower limit of the width of the knurling 1f is preferably 2 mm or more, more preferably 3 mm or more, and the upper limit is preferably 8 mm or less, more preferably 6 mm or less. The width of the knurling 1f is measured using a microscope. The knurling 1f includes indentations, which will be described later, and each indentation has a substantially square shape, and the knurling 1f is formed by continuously applying indentations in one, two, three, or four rows, etc. In this case, the width of the knurling 1f refers to the distance from an end of an indentation at one end of the knurling 1f to an end of an indentation at the other end.

[0054] The knurling 1f has a pressing portion, and the area of ​​each pressing portion is 0.04 mm 2 More than 2.0mm 2 The area is 0.04 mm 2 If the area is less than 2.0 mm, the adhesion between the plies of toilet paper 1x due to the knurling 1f will be weak, and as a result, the plies will be more likely to peel off. 2 If it exceeds this value, the knurling 1f will become more noticeable and the aesthetic quality will be reduced. The lower limit of the area of ​​each pressing part is 0.07 mm 2 It is preferable that the thickness is 0.09 mm or more. 2 More preferably, the upper limit is 1.5 mm. 2 Preferably, it is 1.0 mm or less. 2 It is more preferable that: The area of ​​each indentation of the knurling 1f is measured using a microscope.

[0055] Furthermore, the ratio of the pressed-in portion within the square in the knurled portion, one side of which is the width of the knurling 1f, is 2% or more and 70% or less. If the ratio is less than 1%, the adhesion between the plies of the toilet paper 1x by the knurling 1f will be weak, and as a result, the plies will be more likely to peel off. If the ratio exceeds 70%, the knurling 1f will be more noticeable and the aesthetic appearance will be poor. In this case, the ratio of the pressed-in portion means the ratio of the area that the pressed-in portion occupies within the area of ​​the square in the knurled portion, one side of which is the width of the knurling 1f described above. The upper limit of the proportion of the pressed-in portions is preferably 50% or less, and more preferably 40% or less, and the lower limit is preferably 10% or more, and more preferably 15% or more. The proportion of the indented portion is calculated from the following formula: A microscope is used for the measurement. Proportion of indentations = (area of ​​one indentation x number of indentations in a square in the knurling section where one side is the width of knurling 1f) / area of ​​a square in the knurling section where one side is the width of knurling 1f x 100

[0056] <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) ply lamination and bonding treatment, (3) knurling processing, and (4) roll winding processing. 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.

[0057] As described above, according to this embodiment, in a toilet roll 1 wound with toilet paper 1x that is not embossed but has knurling 1f, it is possible to provide a toilet roll 1 in which the plies are less likely to peel off and which has excellent cosmetic properties. EXAMPLES

[0058] 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.

[0059] Under the conditions shown in Table 1, two-ply toilet papers and toilet rolls of Examples 1 to 12 and Comparative Examples 1 to 5 were produced, 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.

[0060] (Ply peeling) Thirty test subjects evaluated the toilet paper for ply peeling when using the manufactured toilet rolls. The test subjects rated the toilet paper on a four-point scale based on the number of test subjects who judged the toilet paper to be less susceptible to ply peeling when used. ◎: More than 28 monitors rated the product as being less susceptible to ply peeling. 〇: The number of monitors who evaluated that ply peeling is unlikely to occur is 26 to 27 people. △: The number of monitors who evaluated that ply peeling is unlikely to occur is 23 to 25 people. ×: The number of monitors who evaluated that ply peeling is unlikely to occur is 22 or less.

[0061] (cosmetic) Thirty testers visually inspected the toilet paper and rated its cosmetic qualities. The toilet paper was rated on a four-point scale based on the number of testers who rated it as having excellent cosmetic qualities. ◎: 28 or more monitors rated the toilet paper as having excellent cosmetic properties 〇: The number of monitors who rated the toilet paper as excellent in cosmetic properties was 26 to 27 people. △: The number of monitors who rated the toilet paper as excellent in cosmetic properties was 23 to 25. ×: The number of monitors who rated the toilet paper as having excellent cosmetic properties was 22 or less.

[0062] Table 1 shows the conditions and evaluation results for each of the examples and comparative examples. [Table 1]

[0063] From the above, it was at least confirmed that, according to this embodiment, in a toilet roll obtained by winding toilet paper that is not embossed but has been knurled, a toilet roll can be obtained in which the plies are less likely to peel off and which is also excellent in terms of the aesthetic appeal of the toilet paper. [Explanation of symbols]

[0064] 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 1F Knurling 1x toilet paper

Claims

1. A toilet roll is a toilet paper roll made by laminating two plies of a non-embossed sheet and winding the toilet paper around a paper tube. The roll length is 45 m or more and 150 m or less, and the roll diameter is 100 mm or more and 143 mm or less, The basis weight of one ply of the toilet paper is 11 g / m ２ 20g / m or more ２ is as follows: The toilet paper has perforations extending in the width direction and spaced equally along the length of the paper, In the toilet paper, the tab strength of the region including the perforation in the two plies is 2.5 N / 75 mm or more and 9.0 N / 75 mm or less, and the tab strength of the region including the perforation in the one ply on the roll surface side is 1.25 N / 75 mm or more and 4.5 N / 75 mm or less, The toilet paper further has knurling in a substantially linear manner in the longitudinal direction, The width of the knurling is 1 mm or more and 10 mm or less, The knurling has a depression, and each depression has an area of ​​0.04 mm ２ More than 2.0 mm ２ The toilet roll is characterized in that the ratio of the pressed-in portions within a square in a knurling portion, one side of which is the width of the knurling ((area of ​​one pressed-in portion x number of pressed-in portions within a square in a knurling portion, one side of which is the width of the knurling) / area of ​​a square in a knurling portion, one side of which is the width of the knurling x 100) is 2% or more and 70% or less.

2. The winding density of the roll is 1.1 m / cm ２ 2.0m / cm or more ２ 2. The toilet roll according to claim 1, characterized in that:

3. The roll density of the roll is 0.13 g / cm ３ 0.33g / cm or more ３ 3. The toilet roll according to claim 1 or 2, characterized in that:

4. 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 3. The toilet roll according to claim 1 or 2, wherein the hardness of the paper tube is 1.6 mm or more and 2.8 mm or less, where the hardness of the paper tube is defined as the hardness of the paper tube.

5. The toilet roll according to claim 1 or 2, characterized in that the toilet paper has a tensile strength DMDT in the MD direction when dry according to JIS P 8113 of 2.5 N / 25 mm or more and 7.5 N / 25 mm or less.

6. 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 2.5 N / 25 mm or less.

7. The toilet roll according to claim 1 or 2, characterized in that the roll mass excluding the paper core is 200 g or more and 400 g or less.

8. The toilet roll according to claim 1 or 2, characterized in that the toilet paper has a paper thickness of 0.4 mm / 10 sheets or more and 1.3 mm / 10 sheets or less.

9. The specific volume of the toilet paper is 3.0 cm ３ / g or more 7.0cm ３ The toilet roll according to claim 1 or 2, characterized in that the elasticity is 1 / g or less.

10. 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.

11. The apparent basis weight of the paper tube is 200 g / m ２ More than 500g / m ２ 3. The toilet roll according to claim 1 or 2, characterized in that:

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