Toilet roll

Abstract

To provide a toilet roll to which two plies of toilet paper without embossment and knurling, in which intensity of perforation can be held, and the plies are hardly detached.SOLUTION: There is provided a toilet roll in which toilet paper without embossment and knurling is wound and the sheets of the toilet paper are laminated in two plies, the toilet paper has perforations extending in a width direction and arranged at an interval of 100 mm or more and 235 mm or less in a longer direction, a cut width of the perforation is 1.0 mm or more and 3.0 mm or less, a bond cut ratio is 35% or more and 65% or less. In the toilet roll, tab intensity of a region including the perforation in two plies is 2.5 N / 75 mm or more and 9.0 N / 75 mm or less, tab intensity of a region including the perforation in one ply on a roll surface side is 1.25 N / 75 mm or more and 4.5 N / 75 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

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

[0003] Long toilet rolls need to be made thinner in order to make the overall size compact.

[0004] Incidentally, in general toilet rolls, the toilet paper (hereinafter also referred to as the sheet) is embossed to stabilize the roll diameter and texture, and knurling (ply embossing) is applied to prevent ply peeling.

[0005] As an example of a prior art document for such embossed or knurled toilet paper, Patent Document 1 describes a toilet roll in which double embossing has been applied and two plies of toilet paper are wound into a roll, the toilet roll having perforations in the width direction of the toilet paper and ply embossments in the longitudinal direction of the toilet paper, a roll length of 45 m or more and 93 m or less, a roll diameter of 100 mm or more and 143 mm or less, and a basis weight of one ply of 11 g / m 2 More than 19g / m 2and in the area including the perforations in the 2-ply toilet paper, the DMDT is 2.5 N / 75 mm or more and 8.3 N / 75 mm or less, and the DCDT is 1.9 N / 75 mm or more and 5.9 N / 75 mm or less, and in the area including the perforations in the 1 ply toilet paper on the outside of the roll, the DMDT is 1.3 N / 75 mm or more and 4.2 N / 75 mm or less, and the DCDT is 1.0 N / 75 mm or more and 3.0 N / 75 mm or less, the height of the ply embossment is 0.10 mm or more and 0.80 mm or less, and the width of the ply embossment is 1 mm or more and 20 mm or less.

[0006] Patent Document 2 also describes a toilet roll in which two sheets of toilet paper are overlapped and wound into a roll, the length of the toilet roll being 40 m or more and 100 m or less, the diameter of the toilet roll being 100 mm or more and 134 mm or less, and the basis weight per sheet being 11 g / m 2 More than 20.5g / m 2 The winding density of the toilet roll is 0.65 m / cm 2 More than 2.05m / cm 2 The toilet roll disclosed is characterized in that the toilet paper has a single embossment on the entire surface and a bonding embossment to prevent the plies of the two sheets from peeling apart, and is wound up so that the embossed recesses are on the outside of the roll, the toilet paper has tear perforations that cross the width of the toilet paper at regular intervals along the longitudinal direction of the toilet paper, and the embossing depth of the single embossment and bonding embossment is 0.8 mm or less.

[0007] Furthermore, Patent Document 3 discloses a toilet roll having a single ply of toilet paper wound into a roll, the toilet roll having a plurality of projections on one surface and a corresponding recess on the opposite surface, and having perforations along the width direction, the toilet roll having a roll length of 105 to 210 m, a roll diameter of 100 to 140 mm, a roll weight including the core per 114 mm of roll width of 230 to 490 g, and a longitudinal tensile strength (DMDT) of the perforations per 114 mm of roll width when dry based on JIS P8113 of 3.9 to 15.0 N / 114 mm. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2020-127621 A [Patent Document 2] Patent Publication No. 2022-067288 [Patent Document 3] JP 2020-072990 A Summary of the Invention [Problem to be solved by the invention]

[0009] On the other hand, by using toilet paper that is not embossed or knurled, the thickness of the toilet paper can be reduced, making it possible to produce a long toilet roll. However, if the embossing or knurling is not performed, the ply is likely to peel off, resulting in a poor feel when used.

[0010] Furthermore, because long toilet rolls have a large roll mass, the perforations are often made strong to prevent them from breaking except when the roll is in use. In that case, however, the recoil when the sheet is cut at the perforations becomes large, which can result in the plies peeling off. When the plies peel off, problems occur such as the rough underside (hood) surface of the overlapping plies becoming visible, the perforations becoming misaligned, and the sheet becoming more prone to tearing when wiped.

[0011] For these reasons, it was difficult to achieve both the strength of the perforations and the resistance to peeling of the plies in long toilet paper and toilet rolls made by laminating two plies of sheets that were neither embossed nor knurled.

[0012] The present invention has been made in consideration of the above circumstances, and aims to provide a toilet roll made of two-ply toilet paper that is neither embossed nor knurled, in which the plies are not easily peeled off while maintaining the strength of the perforations. [Means for solving the problem]

[0013] The inventors conducted extensive research and found that, in a toilet roll obtained by winding up two plies of toilet paper that are neither embossed nor knurled 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 predetermined intervals, the cut width at the cut portion of the perforation and the bond portion / cut portion ratio are each within a predetermined numerical range, and further, the tab strength of the area including the perforation in the two plies and the tab strength of the area including the perforation in the one ply on the roll surface side are each within a predetermined numerical range, thereby making it possible to obtain a toilet roll in which the plies are difficult to peel off while maintaining the strength of the perforations, and thus completing the present invention. That is, the present invention provides the following.

[0014] (1) The first aspect of the present invention is a toilet roll in which toilet paper, which is made by laminating two plies of sheets that are neither embossed nor knurled, is wound into a roll on a paper tube, the roll length is 45 m or more and 150 m or less, the roll diameter is 100 mm or more and 143 mm or less, 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, arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction, the cut width at the cut portion of the perforations is 1.0 mm or more and 3.0 mm or less, the bond portion / cut portion ratio (bond cut rate) is 35% or more and 65% or less, the tab strength of the region including the perforations in 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 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.

[0015] (2) A second aspect of the present invention is the toilet roll according to (1), 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.

[0016] (3) The third 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:

[0017] (4) A fourth aspect of the present invention is the toilet roll according to (1), wherein the roll density of the roll is 0.13 g / cm 3 More than 0.33g / cm 3 It is characterized in that:

[0018] (5) A fifth 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 2.5 N / 25 mm or more and 7.5 N / 25 mm or less.

[0019] (6) The sixth aspect of the present invention is the toilet roll according to (1), characterized in that the toilet paper has a tensile strength in the CD direction when dry (DCDT) based on JIS P 8113 of 0.7 N / 25 mm or more and 2.5 N / 25 mm or less.

[0020] (7) A seventh aspect of the present invention is the toilet roll according to (1), characterized in that the roll mass excluding the paper core is 200 g or more and 400 g or less.

[0021] (8) An eighth aspect of the present invention is the toilet roll according to (1), characterized in that the paper thickness of the toilet paper is 0.4 mm / 10 sheets or more and 1.3 mm / 10 sheets or less.

[0022] (9) The ninth aspect of the present invention is the toilet roll according to (1), wherein the specific volume of the toilet paper is 2.0 cm 3 / g or more 11.8cm 3 / g or less.

[0023] (10) A tenth aspect of the present invention is the toilet roll according to (1), characterized in that the outer diameter of the paper tube is 25 mm or more and 48 mm or less.

[0024] (11) The eleventh aspect of the present invention is the toilet roll according to (1), 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

[0025] According to the present invention, it is possible to provide a toilet roll made of two plies of toilet paper that is neither embossed nor knurled, in which the plies are not easily peeled off while maintaining the strength of the perforations. [Brief description of the drawings]

[0026] [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

[0027] 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.

[0028] 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.

[0029] <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 two plies of toilet paper 1x that are neither embossed nor knurled are 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 that extend in the width direction and are 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, the surface of the toilet paper 1x that faces the outside of the roll is referred to as the roll surface 1a (the surface of the toilet paper 1x), the surface that faces the center of the roll is referred to as the roll back surface 1b (the back surface of the toilet paper 1x), and the outermost end of the rolled up toilet paper 1x is referred to as the outermost roll edge 1e of the toilet paper 1x.

[0030] (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, so the roll mass is light and there is no need to maintain the strength of the perforations 1c. As a result, the roll diameter DR, which will be described later, becomes too small. If the roll length exceeds 150 m, the roll mass becomes heavy, making it difficult to maintain the strength of the perforations 1c. As a result, 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.

[0031] (Roll diameter) Furthermore, 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, and as a result, the roll length is too short. This makes the roll mass light, and there is no need to maintain the strength of the perforations 1c. If the roll diameter DR exceeds 143 mm, the roll diameter DR becomes too large. This makes the roll mass heavy, and it becomes difficult to maintain the strength of the perforations 1c. 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.

[0032] 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.

[0033] (seat length and width) Furthermore, the length between the perforations 1c (the sheet length of the toilet paper 1x) is preferably 100 mm or more in lower limit, more preferably 123 mm or more, and even more preferably 145 mm or more in upper limit. The upper limit is preferably 235 mm or less, more preferably 213 mm or less, and even more preferably 190 mm or less. If the length between the perforations 1c is less than 100 mm, it becomes difficult to wind the paper into a roll. If the length between the perforations 1c exceeds 235 mm, the ply becomes more likely to peel off, as described below, since the present application suppresses ply peeling by providing perforations. 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.

[0034] (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 roll diameter DR will be too small and the roll length will be too short. As a result, the roll mass will be light and it will be unnecessary to maintain the strength of the perforation 1c. If the roll mass exceeds 400 g, the roll diameter DR will be too large. This will result in a heavy roll mass, making it difficult to maintain the strength of the perforation 1c. In addition, the recoil of cutting at the perforation 1c will make the ply more likely to peel 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.

[0035] (Roll density) The roll density of toilet roll 1 is 0.13 g / cm 3 More than 0.33g / cm 3 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, and the rolls will rub against each other during transportation, making the plies more likely to peel off. In addition, the roll mass will be lighter, and it will not be necessary to maintain the strength of the perforation 1c. 3 If the thickness exceeds this value, the toilet roll 1 will become tightly wound, the roll weight will become heavy, and it will become difficult to maintain the strength of the perforation 1c. In addition, the recoil from cutting at the perforation 1c will cause the ply to peel off easily. The minimum roll density of toilet roll 1 is 0.16 g / cm 3 It is preferable that the content is 0.20 g / cm or more. 3 The upper limit is preferably 0.30 g / cm or more.3 It is preferable that the density is 0.26 g / cm or less. 3 It is more preferable that:

[0036] 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 114 mm of roll width is 321 g, the winding diameter DR is 119 mm, and the outer diameter DI of the paper core 1d is 39 mm, the roll density = 0.29 g / cm 3 If the toilet roll does not have a paper core, the diameter of the center hole is regarded as the core outer diameter.

[0037] (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 winding diameter DR will be large, and the rolls will rub against each other during transportation, making it easier for the plies to peel off. In addition, the roll mass will be light, and it will not be necessary to maintain the strength of the perforation 1c. 2 If the thickness exceeds this value, the toilet roll 1 will become tightly wound, the roll weight will become heavy, and it will become difficult to maintain the strength of the perforation 1c. In addition, the recoil from cutting at the perforation 1c will cause the ply to peel off easily. 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:

[0038] 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 91 m, 1 ply, winding diameter DR of 116 mm, and outer diameter DI of the cardboard tube 1d of 39 mm, the winding density = (91 m x 1) ÷ {3.14 x (116 mm ÷ 10) 2 -3.14×(39mm÷10) 2}=1.94m / cm 2 It becomes.

[0039] (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.

[0040] The mass of the cardboard tube 1d is preferably 4.0 g or more and 6.0 g or less. If the mass of the cardboard tube 1d is less than 4.0 g, the cardboard tube 1d and the roll will be crushed when the toilet paper 1x is cut at the perforations 1c, and the reaction will easily cause the ply to peel off. If the mass of the cardboard tube 1d is more than 6.0 g, the cardboard tube 1d will be too hard, making it difficult to cut the toilet paper 1x cleanly when cutting, and the reaction will easily cause the ply to peel off. 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.

[0041] 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 / m2, when the toilet paper 1x is cut at the perforation 1c, the paper tube 1d and the roll will be crushed, and the ply will be easily peeled off in reaction. 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, and as a result, the ply peels off easily. 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 equal to or less than 100 g / m2.

[0042] Furthermore, the hardness of the paper tube 1d is preferably 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 mass of the toilet roll 1 will be low as a result, and the ply will be more likely to peel off due to the reaction when the toilet paper 1x is cut at the perforation 1c. If the hardness of the paper tube 1d is more than 2.8 mm, the paper tube 1d will be too hard, making it difficult to cut the toilet paper 1x cleanly when cutting, and the ply will be more likely to peel off due to the reaction. 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 paper tube 1d was measured by placing the paper tube 1d horizontally on a hard table so that the axis of the paper tube 1d was horizontal, and placing a compression tool (area 2.0 cm2) on the center of the outer surface of the paper 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.

[0043] <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.

[0044] (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 / m2, the toilet paper 1x will be too soft and the pressure at the perforation 1c will be weak, making the ply peeling more likely to occur. As a result, the strength of the perforation 1c will be reduced. 2If it exceeds this value, the toilet paper 1x will become too hard, making it difficult to form the perforations 1c neatly, and peeling of the ply will become more likely to occur. The minimum basis weight of one ply of toilet paper is 12.5 g / m 2 It is preferable that the content is 14.0 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.

[0045] (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, and the pressure bonding at the perforation 1c is weak, making it easy for the ply to peel off. As a result, the strength of the perforation 1c is reduced. If the paper thickness exceeds 1.3 mm / 10 sheets, the perforation 1c cannot be neatly provided, making it easy for the ply to peel off, and as a result, the roll diameter DR becomes large, 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 0.5 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.

[0046] (specific volume) In addition, the specific volume of the toilet paper 1x according to one embodiment of the present invention is 2.0 cm 3 / g or more 11.8cm 3 / g or less. 3 If the specific volume is less than 11.8 cm3 / g, the toilet paper 1x will be too soft and the pressure at the perforation 1c will be weak, making the ply peeling more likely to occur. As a result, the strength of the perforation 1c will be low. 3 If the thickness exceeds 1 / g, the perforations 1c cannot be formed neatly, and the ply peeling becomes more likely to occur. Also, the toilet paper 1x becomes too stiff when wound up, and as a result, the ply peeling becomes more likely to occur. The minimum specific volume of 1x toilet paper is 2.7 cm 3 / g or more is more preferable, and 3.5 cm 3 The upper limit is preferably 9.6 cm / g or more. 3 / g or less is more preferable, and 7.8 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:

[0047] (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, and the pressure bonding at the perforation 1c is weak, so that ply peeling is likely to occur. As a result, the strength of the perforation 1c is reduced. If the DMDT exceeds 7.5 N / 25 mm or the DCDT exceeds 2.5 N / 25 mm, the perforations 1c cannot be formed neatly, and the ply is more likely to peel off. In addition, the toilet paper 1x becomes too stiff when wound up, and as a result, the ply is more likely to peel off.

[0048] The lower limit of 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 5.8 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.

[0049] (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, which are arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction. The toilet roll 1 of the present invention is an invention in which, when providing these perforations 1c, the lengths of the bond portion and the cut portion are optimized, thereby bonding the plies together without using knurling.

[0050] In this case, 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, it becomes difficult to wind the sheet into a roll. Also, the perforations 1c become more likely to tear, resulting in a decrease in the strength of the perforations 1c. If the pitch exceeds 235 mm, the perforations 1c portion (the bonded portion of the sheet) becomes smaller, making the ply more likely to peel off. The lower limit of the pitch of the perforations 1c is more preferably 123 mm or more, and even more preferably 145 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.

[0051] In addition, the ratio of the bonded portion to the cut portion of the perforation 1c (bond cut rate) is 35% or more and 65% or less. If the bond cut rate is less than 35%, the perforation 1c is more likely to break, resulting in a lower strength of the perforation 1c. This makes it difficult to wind the sheet into a roll. If the bond cut rate exceeds 65%, the cut portion of the perforation 1c (the crimped portion of the sheet) becomes shorter, making the ply more likely to peel off. The bond cut rate of the perforation 1c has a lower limit of preferably 40% or more, more preferably 45% or more, and an upper limit of preferably 60% or less, more preferably 55% or less.

[0052] Furthermore, the cut width of the perforation 1c is 1.0 mm or more and 3.0 mm or less. If the cut width is less than 1.0 mm, the cut portion of the perforation 1c (the crimped portion of the sheet) becomes short, making the ply more likely to peel off. If the cut width exceeds 3.0 mm, the perforation 1c becomes more likely to tear, resulting in a decrease in the strength of the perforation 1c. This makes it difficult to wind the sheet into a roll. The lower limit of the cut width of the perforation 1c is preferably 1.3 mm or more, and more preferably 1.7 mm or more, and the upper limit is preferably 2.7 mm or less, and more preferably 2.3 mm or less.

[0053] The lower limit of the bond width of the perforation 1c is preferably 0.5 mm or more and 2.5 mm or less. If the bond width is less than 0.5 mm, the perforation 1c is easily cut, resulting in a decrease in the strength of the perforation 1c. This makes it difficult to wind the sheet into a roll. If the bond width exceeds 2.5 mm, the cut portion of the perforation 1c (the crimped portion of the sheet) becomes short, making the ply more likely to peel off. The lower limit of the bond width of the perforation 1c is more preferably 0.8 mm or more, and even more preferably 1.2 mm or more, and the upper limit is more preferably 2.2 mm or less, and even more preferably 1.8 mm or less. 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.

[0054] In addition, in the toilet paper 1x, the tab strength of the area including the perforation 1c in the 2 plies is 2.5 N / 75 mm or more and 9.0 N / 75 mm or less. If the tab strength is less than 2.5 N / 75 mm, the perforation 1c is easily cut, resulting in a low strength of the perforation 1c. This makes it difficult to wind the paper into a roll. If the tab strength exceeds 9.0 N / 75 mm, the cut portion of the perforation 1c (the crimped portion of the sheet) becomes shorter, making the plies more likely 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.

[0055] Furthermore, in the toilet paper 1x, the tab strength of the region including the perforation 1c in the 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 the one ply on the roll surface 1a side is less than 1.25 N / 75 mm, the perforation 1c is easily cut, resulting in a low strength of the perforation 1c. This makes it difficult to wind the paper into a roll. If the tab strength of the one ply on the roll surface 1a side exceeds 4.5 N / 75 mm, the cut portion of the perforation 1c portion (the crimped portion of the sheet) becomes short, making the ply more likely to peel off. 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.

[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, and (3) 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.

[0057] As described above, according to this embodiment, in a toilet roll 1 wound with two plies of toilet paper 1x that is neither embossed nor knurled, it is possible to provide a toilet roll 1 in which the plies are not easily peeled off while maintaining the strength of the perforations 1c. 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 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.

[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] (Perforation strength) Thirty test subjects rated the perforation strength of the toilet paper when using the toilet roll. The test subjects rated the perforation strength as moderately strong, and the test subjects rated it on a two-point scale. ◎: More than 28 monitors rated the perforations as being moderately strong and easy to use 〇: The number of monitors who rated the perforation strength as moderately strong and easy to use was 26 to 27. △: The number of monitors who rated the perforation strength as moderately strong and easy to use was 23 to 25. ×: The number of monitors who rated the perforation strength as moderately strong 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 made of two plies of toilet paper that are neither embossed nor knurled, a toilet roll can be obtained in which the strength of the perforations is maintained and the plies are not easily peeled off. [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 1x toilet paper

Claims

1. A toilet roll is a toilet paper roll made by laminating two plies of sheets that are neither embossed nor knurled, and winding the toilet paper around a paper tube in a roll shape. 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 arranged at intervals of 100 mm or more and 235 mm or less in the longitudinal direction, The cut width at the cut portion of the perforation is 1.0 mm or more and 3.0 mm or less, and the ratio of the bond portion / cut portion (bond cut rate) is 35% or more and 65% or less, The toilet roll, characterized in that 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.

2. 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 2. The toilet roll according to claim 1, 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.

3. 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:

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

5. 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 2.5 N / 25 mm or more and 7.5 N / 25 mm or less.

6. The toilet roll according to claim 1, 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, 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, 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 2.0 cm ３ / g or more 11.8cm ３ The toilet roll according to claim 1, characterized in that the elasticity is 1 / g or less.

10. The toilet roll according to claim 1, wherein 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 2. The toilet roll according to claim 1, characterized in that:

Images