Toilet paper roll

Abstract

[Problem] To provide a toilet paper roll with little crush, collapse, or inversion of recesses. [Solution] The problem is solved by a toilet paper roll in which two-ply double-embossed toilet paper is wound around a paper tube, the toilet paper being a lamination of a first sheet which has recesses and protrusions, corresponding to the recesses, formed by embossing, and which is positioned on a winding outer side, and a second sheet which has recesses and protrusions, corresponding to the recesses, formed by embossing, and which is positioned on a winding inner side, and the first sheet and the second sheet being laminated such that protrusion-forming surfaces face each other. The toilet paper roll has a winding length of 45 m or more, a roll diameter of 110-130 mm, and a winding density of 0.75-1.6. The basis weight per ply of the toilet paper is 11.0-18.0 g / m2, the paper thickness of the two plies is 125-205 μm, the paper thickness of the first sheet is 65-120 μm, and the embossed pattern of the first sheet has recesses arranged on a straight line at a predetermined interval, and valleys which are shallower than the recesses and extend in four directions from the recesses to connect the recesses. The direction in which the recesses are aligned and the valley extension direction do not match the flow direction of the toilet paper.

Description

Toilet roll

[0001] The present invention relates to a toilet roll in which a strip of toilet paper is wound into a roll.

[0002] Toilet rolls are available in a variety of roll lengths to suit consumer preferences. For example, there are known products such as normal or standard products, in which two-ply toilet paper is wound to a length of about 25 to 30 m, products with a roll length 1.5 times that of the normal product, that is, about 37.5 to 45 m, products with a roll length twice that of the normal product, that is, about 50 to 60 m, products with a roll length 3 times that of the normal product, that is, about 75 to 90 m, products with a roll length 3 times that of the normal product, and products with a roll length 3.2 times that of the normal product (see Patent Document 1 below). Products with a roll length exceeding 1.5 times are sometimes referred to as long products, etc.

[0003] On the other hand, some toilet rolls are wrapped with toilet paper that has been embossed to create a textured surface. Known types of toilet paper texture, known in relation to the embossing process, are single embossed and double embossed.

[0004] Generally, single embossing refers to a mode in which a recess is formed on one side and a protrusion corresponding to the recess is formed on the other side by embossing, while double embossing refers to a mode in which multiple sheets are stacked together, each sheet having a recess on one side and a protrusion corresponding to the recess on the other side by embossing (see Patent Documents 1 to 4 below).

[0005] Double-embossed toilet paper is usually stacked so that the recessed surface of each sheet faces outward, and is superior to single-embossed toilet paper in that both the front and back surfaces are smooth, there is little difference in feel between the front and back surfaces, and the formation of gaps between the sheets gives it a fluffy, soft feel (see Patent Document 4 below).

[0006] JP 2020-179882 A JP 2022-066267 A JP 2023-065593 A JP 2021-053249 A

[0007] However, it has been found that in toilet rolls wound with double-embossed toilet paper, particularly as the roll length increases, many toilet rolls have areas where the recesses are crushed or collapsed, or where the recesses are inverted into a convex shape.

[0008] It was found that the surface becomes less smooth and less fluffy in these areas. Furthermore, it was also found that the formation of such areas can cause differences in the clarity of the recesses and the occurrence of vertical wrinkles along the winding direction, which can reduce the overall design quality.

[0009] In particular, the toilet roll disclosed in Patent Document 4 has an embossed pattern in which recesses are arranged at predetermined intervals along the winding direction and valley grooves are formed to connect the four corners of the recesses. The valley grooves make the toilet paper more flexible, making it suitable for increasing the winding length of double-embossed toilet paper. However, even with an embossed pattern in which the recesses are connected by valley grooves, the above-mentioned collapse of the recesses occurs.

[0010] Therefore, the main object of the present invention is to improve the collapse and crumbling of recesses and the formation of areas where recesses are inverted into convex shapes in toilet rolls wrapped with double-embossed toilet paper, and to provide toilet rolls that are smooth and fluffy and soft.

[0011] The first means for solving the above problem is a toilet roll in which two plies of double embossed toilet paper are wound around a paper tube, the first sheet having embossed recesses and protrusions corresponding to the recesses and located on the outer surface of the roll, and the second sheet having embossed recesses and protrusions corresponding to the recesses and located on the inner surface of the roll, are laminated so that the protrusion-forming surfaces face each other, the toilet roll having a winding length of 45 m or more, a roll diameter of 110 to 130 mm, and a winding density of 0.75 to 1.6, and the toilet roll having a basis weight per ply of 11.0 to 18.0 g / m ２the paper thickness of the two plies is 125 to 205 μm, the paper thickness of the first sheet is 65 to 120 μm, the embossed pattern of at least the first sheet has recesses arranged in a straight line at a predetermined interval, and valley grooves that are shallower than the recesses and extend in all directions from the recesses to connect the recesses, and the direction in which the recesses are arranged and the extension direction of the valley grooves do not coincide with the direction in which the toilet paper flows.

[0012] The second aspect is the toilet roll according to the first aspect, in which the direction in which the recesses are arranged is at an angle of between ±10 degrees and ±45 degrees with respect to the direction of flow of the toilet paper.

[0013] A third aspect is the toilet roll according to the first or second aspect, wherein the shape of the recesses in the first sheet is a square or a four-pointed star, and the valley grooves extend from the four vertices of the recesses.

[0014] A fourth aspect is the toilet roll according to the third aspect, wherein the interval between the recesses of the first sheet is 5.05 to 5.35 mm.

[0015] A fifth aspect is the toilet roll according to the third or fourth aspect, wherein the width of the recessed portion of the first sheet is 1.15 to 1.31 mm.

[0016] According to the present invention, collapse and crumbling of recesses and formation of areas where recesses are inverted into convex shapes in a toilet roll wound with double-embossed toilet paper are improved, and a toilet roll with excellent smoothness and fluffy softness is provided.

[0017] 8 is a perspective view illustrating a toilet roll according to the present invention. FIG. 9 is a plan view illustrating an embossing pattern of a first sheet according to the present invention. FIG. 10 is a plan view illustrating a method for forming recesses according to the present invention. FIG. 11 is a plan view illustrating another embossing pattern of a first sheet according to the present invention. FIG. 12 is a plan view illustrating another embossing pattern of a first sheet according to the present invention. FIG. 13 is a plan view illustrating yet another embossing pattern of a first sheet according to the present invention. FIG. 14 is a schematic view of cross sections II, II-II, and III-III in FIG. 2. FIG. 15 is a plan view illustrating measurement points for the cross-sectional curves of the recesses. FIG. 16 is a view illustrating examples of undulation curves at positions A1-A1 and A2-A2 in FIG. 8. FIG. 17 is a view illustrating examples of undulation curves at positions B1-B1 and B2-B2 in FIG. 8. FIG. 18 is a plan view illustrating an embossing pattern of a second sheet according to the present invention. FIG. 19 is a plan view illustrating overlapping of recesses of a first sheet and recesses of a second sheet according to the present invention. FIG. 19 is a view illustrating toilet paper according to a comparative example.

[0018] Next, an embodiment of the present invention will be described in detail below with reference to Figures 1 to 12. As shown in Figure 1, the toilet roll 1 according to this embodiment is formed by winding two-ply water-decomposable toilet paper 10, which is made up of two laminated sheets, a first sheet 11 and a second sheet 12, around a paper tube 20, also known as a tube core, and has a cylindrical shape. In the toilet roll 1 of this embodiment, the toilet paper 10 is wound so that the first sheet 11 is on the outer surface of the winding and the second sheet 12 is on the inner surface of the winding.

[0019] Whereas the roll length of two-ply toilet rolls, known as ordinary or standard products, is approximately 25 to 30 m, the roll length of the toilet roll 1 according to this embodiment is 45 m or more and two-ply, and can be wound into a product group known as a long product, such as a 1.5x, 2x, 3x, or 3.2x wound product. In terms of the effects of the present invention, the upper limit of the roll length is preferably 125 m, and is suitable for long products with a roll length of 4 to 4.2 times the roll length of a product group known as an ordinary or standard product.

[0020] The roll diameter L2 (diameter) of the toilet roll 1 according to this embodiment is 110 to 130 mm, preferably 110 to 120 mm. Holders for setting toilet rolls are generally manufactured based on JIS P 4501, with a standard diameter of 120 mm. The toilet roll according to this embodiment has a roll diameter of 110 to 130 mm and can be set in a standard holder. Furthermore, if the roll diameter is less than 110 mm in relation to the roll length, the toilet paper will be tightly wound, which will likely result in a deterioration in quality aspects such as feel. Here, the roll diameter L2 is a value measured using a diameter ruler manufactured by Muratec KDS Corporation or an equivalent device. The roll width L1 of the toilet roll 1 according to this embodiment is not limited, but is preferably 100 to 120 mm. The outer diameter L3 of the cardboard tube 20 is also not limited, but is preferably 36 to 42 mm.

[0021] The toilet paper 10 wound into the toilet roll 1 according to this embodiment is a two-ply toilet paper 10 in which a first sheet 11 and a second sheet 12 having embossed recesses and protrusions are laminated together. Furthermore, this toilet paper 10 is double-embossed toilet paper 10 in which each of the first sheet 11 and the second sheet 12 has an uneven configuration with recesses 32 on one side and protrusions 31 corresponding to the recesses 32 on the other side, and the surfaces on which the protrusions are formed face each other, with the first sheet 11 located on the outer surface of the roll and the second sheet 12 located on the inner surface of the roll.

[0022] The toilet paper 10 of this embodiment is not a so-called laminate embossed type in which the outer sheet and the inner sheet are bonded together with an adhesive. That is, the first sheet 11 and the second sheet 12 are not bonded together with an adhesive or the like. In order to prevent ply separation, the first sheet 11 and the second sheet 12 are preferably integrated together by a ply compression bonding method called contact embossing, edge embossing, knurling, or the like.

[0023] In the toilet paper 10 of this embodiment, the basis weight of the first sheet 11 and the second sheet 12, i.e., the basis weight per ply, is 11.0 to 18.0 g / m ２ , preferably 12.0 to 17.0 g / m ２ If the basis weight of the first sheet 11 and the second sheet 12 is within this range, it is possible to obtain a sufficient feel to the touch, such as softness and fluffyness, required for long products, particularly long products wound at 1.5 times to 4.2 times, while improving the collapse and collapse of recesses and the formation of portions where the recesses are inverted into a convex shape. The basis weight can be adjusted, for example, by the fiber basis weight, crepe rate, etc. The difference in basis weight between the first sheet 11 and the second sheet 12 is set to 0.5 g / m so as to reduce the difference in tensile strength and stiffness between the outer and inner surfaces of the winding. ２ The basis weight is preferably adjusted by the winding length, and the basis weight is 16.0 to 17.0 g / m for 1.5 times winding and 2 times winding lengths. ２ , 3 times winding, 3.2 times winding, 4.2 times winding length, 11.0 to 13.0 g / m ２ It is desirable to do so.

[0024] The toilet paper 10 of this embodiment has a paper thickness of 120 to 205 μm, preferably 125 to 200 μm, for a two-ply configuration. This paper thickness range allows for sufficient thickness and fluffiness required for long products wound at 1.5 to 4.2 times the roll diameter. The paper thickness can be adjusted, for example, by using or not using a calendar, the calendar pressure, the embossing process, the crepe rate, etc.

[0025] In particular, in the toilet paper 10 of this embodiment, the thickness of the first sheet 11 is 65 to 120 μm. Because the first sheet 11 is located on the outer surface of the roll, it is the surface on which the design, such as the unevenness caused by the embossing, is visible. At the same time, the outer surface of the roll is subjected to slightly stronger tension than the second sheet 12 on the inner surface of the roll during winding into a roll. Longer products in particular are pulled more strongly during winding and after roll formation than regular products. In the toilet roll 1 of this embodiment, by setting the thickness of the first sheet 11 to 65 to 120 μm, in combination with other configurations of the present invention, such as the basis weight and the embossed pattern described below, the collapse and crumbling of the recesses 32 and the formation of convex inverted portions of the recesses 32 are improved. The thickness of the first sheet 11 can also be adjusted, for example, by using or not using a calendaring treatment, the calendaring pressure, the embossing treatment, the crepe rate, etc. Furthermore, it is desirable to further adjust the paper thickness depending on the winding length, with the paper thickness being 100 to 120 μm for a 1.5x winding length, 95 to 110 μm for a 2x winding length, 70 to 90 μm for 3x and 3.2x winding lengths, and 65 to 75 μm for a 4.2x winding length.

[0026] The thickness of the second sheet 12 in the toilet paper 10 of this embodiment is not necessarily limited, but it is highly desirable that it be 65 to 120 μm, similar to that of the first sheet 11. Furthermore, it is desirable that the difference in thickness between the first sheet 11 and the second sheet 12 be within 20 μm. This eliminates the difference in the crushability of the convex portions in the thickness direction (also called the Z direction), making it less likely that the convex portions of the second sheet 12 will excessively affect the first sheet 11. The thickness of the second sheet 12 can also be adjusted, for example, by the presence or absence of calendaring, the calendaring pressure, the embossing process, the crepe rate, etc.

[0027] Here, the basis weight (basis weight) is measured in accordance with the provisions of JIS P 8124. Furthermore, paper thickness is measured by thoroughly conditioning the test specimen under the conditions of JIS P 8111 (1998) (usually for about 8 hours) and then measuring under the same conditions using a dial thickness gauge (thickness measuring device) "PEACOCK H-type" (manufactured by Ozaki Seisakusho). The thickness of two-ply paper is measured as two plies, while the first sheet 11 or second sheet 12 is measured after peeling each ply. Specifically, the measurement method involves confirming that there is no dirt or dust between the plunger and the measuring table, lowering the plunger onto the measuring table, moving the dial thickness gauge's scale to set the zero point, then raising the plunger and placing the sample on the testing table. With the plunger open to 700 μm, the lever is lowered in one go and the gauge reading is read. During measurement, the plunger is simply placed on the table, not pressed down. The plunger terminal is set so that the circular flat surface with a diameter of 10 mm is in contact with the paper surface perpendicularly, and the load when measuring the paper thickness is about 70 gf. The paper thickness is the average value obtained by performing the measurement 10 times.

[0028] The specific volume of the toilet paper 10 in this embodiment is 5.5 to 7.5 cm for both the first sheet 11 and the second sheet 12. ２ The specific volume is calculated by dividing the paper thickness by the basis weight, and then calculating the volume cm per unit g. ３ Furthermore, it is desirable that the specific volume ratio (specific volume of the first sheet / specific volume of the second sheet) be 90 to 110%. The difference in paper quality between the first sheet 11 and the second sheet 12 is small, and the difference in smoothness and softness of the feel due to the difference in paper quality is also small.

[0029] On the other hand, as shown in Figures 2 to 7, the toilet paper 10 of this embodiment characteristically has an embossed pattern on at least the first sheet 11 located on the outer surface of the roll, which includes linearly spaced recesses 32 and valley grooves 35 that are shallower than the recesses 32 and extend in all directions from the recesses 32 to connect the recesses 32. The first sheet 11 is located on the outer surface of the roll, and since it constitutes the outer surface that is always visible and touched by hand in roll form, design and feel, such as softness and surface smoothness, are particularly important. Toilet paper 10 with an embossed pattern including linearly spaced recesses 32 and valley grooves 35 that extend in all directions from the recesses 32 to connect the recesses 32, has a design with a geometrically orderly impression and improved softness and surface smoothness. In particular, the valley grooves 35 facilitate overall stretch, making it suitable for improving the softness and surface smoothness of long toilet paper 10. It is preferable that the valley groove 35 has a constant depth or that the shallowest portion is located in the center between the recesses 32 .

[0030] The embossing pattern on the second sheet 12 does not necessarily have to be the same as that on the first sheet 11, but preferably is a pattern having recesses 32 arranged in a straight line at a predetermined interval, and valley grooves 35 that are shallower than the recesses 32 and extend in all directions from the recesses 32 to connect the recesses 32, just like the first sheet 11. It is also desirable that the valley grooves 35 on the second sheet 12 have a constant depth or that the shallowest part is in the center between the recesses 32. By using an embossing pattern similar to that on the first sheet 11, differences in paper quality and feel between the front and back of the toilet paper 10 are reduced.

[0031] The shape of the recess 32 in this embodiment is not necessarily limited. Examples include a four-pointed star shape shown in FIGS. 2 and 3 , a rectangle shape shown in FIG. 4 , a circle shape shown in FIG. 5 , and an ellipse shape shown in FIG. 6 . Other shapes include a rounded rectangle shape. A four-pointed star shape surrounded by curves or straight lines shown in FIGS. 2 and 3 and a rectangle shape shown in FIG. 4 are preferred. It is desirable that the lines connecting the vertices of the rectangle and the four-pointed star be perpendicular to each other. A particularly preferred shape for the recess 32 is a four-pointed star shape surrounded by curves shown in FIG. 2 . When the recess 32 is a four-pointed star shape surrounded by curves, the non-recessed portions between the recesses 32 become a rounded rectangle, and the edges of the recesses 32 are curved, which makes the surface feel smooth and soft to the touch. Furthermore, if the recess 32 is a four-pointed star shape surrounded by curves or straight lines or a rectangle, it is desirable that the valley grooves 35 extend from the four vertices of the recess 32. The shape of the recesses 32 does not necessarily have to be the same on the first sheet 11 and the second sheet 12, but it is preferable that the shapes of the recesses 32 on the first sheet 11 and the second sheet 12 are the same. This reduces the difference in paper quality and feel between the front and back of the toilet paper 10.

[0032] Here, the toilet paper 10 according to this embodiment is characterized in that, in the first sheet 11, the direction LD in which the recesses 32 are arranged and the extension direction RD of the valley grooves 35 do not coincide with the flow direction MD of the toilet paper 10. When the direction LD in which the recesses 32 are arranged and the extension direction RD of the valley grooves 35 do not coincide with the flow direction MD of the toilet paper 10, collapse, crushing, and inversion of the recesses are improved. Here, the flow direction of the toilet paper 10 coincides with the winding direction and is the direction in which the toilet paper is pulled when wound into a roll or after being formed into a roll. Generally, it is the longitudinal direction (MD) of the paper. If the direction LD of the recesses 32 and the extension direction RD of the valley grooves 35 are aligned with the flow direction of the toilet paper 10, it is believed that wrinkles along the flow direction, also known as vertical wrinkles, are more likely to occur due to tension differences between the areas where recesses are intermittently aligned along the flow direction in the width direction and the areas where recesses are not aligned, or between the areas where the valley grooves extend and the areas where the valley grooves do not extend, when the toilet paper is wound into a roll or pulled after being formed. It is believed that these wrinkles are the cause of the formation of convex portions due to the collapse, crushing, or inversion of the recesses. If the direction LD of the recesses 32 and the extension direction RD of the valley grooves 35 are not aligned with the flow direction MD of the toilet paper 10, vertical wrinkles are less likely to occur, and convex portions are less likely to form due to the collapse, crushing, or inversion of the recesses.

[0033] In particular, it is desirable that the direction LD of the recesses is between ±10 degrees and ±45 degrees relative to the direction MD of the toilet paper. The embossing pattern of the first sheet 11 shown in the figure shows an example in which the direction LD of the recesses is angled clockwise at an angle α with respect to the direction MD of the toilet paper, forming a negative angle, but it may also be angled counterclockwise at a negative angle. When the direction LD of the recesses is within the above range with respect to the direction MD of the toilet paper, vertical wrinkles caused by tension during winding or after formation of the roll are particularly unlikely to occur, and the formation of convex portions due to the collapse, crushing, and inversion of the recesses caused by wrinkles is also further improved.

[0034] For the second sheet 12, when the embossed pattern is configured such that the recesses 32 are arranged at predetermined intervals and further includes valley grooves extending in all directions from the recesses 32 to connect the recesses, it is desirable that the direction LD in which the recesses 32 are arranged and the extension direction RD of the valley grooves 35 do not coincide with the direction of flow of the toilet paper in the second sheet 12. This makes it difficult for vertical wrinkles to occur in the second sheet 12. Also, it is desirable that the direction LD in which the recesses are arranged is between ±10 degrees and ±45 degrees with respect to the direction of flow MD of the toilet paper in the second sheet.

[0035] Furthermore, in the toilet paper 10 of this embodiment, it is desirable that the embossed pattern of the first sheet 11 and the embossed pattern of the second sheet 12 have a relationship such that the proportion of the number of recesses in the first sheet 11 that overlap with the recesses in the second sheet 12 in a plan view is 80% or less, preferably 75% or less. In other words, if the embossed patterns are such that 80 recesses in the second sheet overlap with 100 recesses in the first sheet 11, the proportion is 80%. In double-embossed toilet paper similar to the toilet paper 10 of this embodiment, in which the sheet on the outer surface of the roll and the sheet on the inner surface of the roll are not bonded with an adhesive or the like, the positions of the convex portions (concave portions) of the sheet on the outer surface of the roll and the convex portions (concave portions) of the sheet on the inner surface of the roll are generally not adjusted. For this reason, when the sheet on the outer surface of the reel is overlapped with the sheet on the inner surface of the reel, there are randomly formed areas where the convex (concave) portions of the sheet on the outer surface of the reel coincide with the convex (concave) portions of the sheet on the inner surface of the reel, areas where the convex (concave) portions of the sheet on the outer surface of the reel are located in areas where the convex (concave) portions of the sheet on the inner surface of the reel are not formed, and areas where the convex (concave) portions of the sheet on the outer surface of the reel are located in areas where the convex (concave) portions of the sheet on the inner surface of the reel are not formed. This causes random interference on the paper surface between the convex (concave) portions of the sheet on the outer surface of the reel and the convex (concave) portions of the sheet on the inner surface of the reel, and is thought to be one of the causes of the concave portions of the sheet on the outer surface of the reel being crushed, collapsed, or turned over. As in this embodiment, when the pattern of the recesses 32 of the first sheet 11 and the pattern of the recesses 32 of the second sheet 12 are in a relationship such that when they are stacked on top of each other on a flat surface, the proportion of overlapping recesses of the second sheet 12 to the number of recesses of the first sheet 11 is 80% or less, the crushing, collapse, and inversion of the recesses of the sheet on the outer surface of the winding can be further improved without adjusting the positions of the convex portions (recesses) of the sheet on the outer surface of the winding and the convex portions (recesses) of the sheet on the inner surface of the winding.

[0036] Furthermore, in terms of the number of overlaps between the recesses 32 on the first sheet 11 and the recesses 32 on the second sheet 12, it is desirable that the direction in which the recesses on the first sheet 11 and the direction in which the recesses on the second sheet 12 are arranged be in a range of opposite angles relative to the direction of flow MD of the toilet paper 10. That is, if the direction LD in which the recesses on the first sheet 11 are arranged is angled clockwise by an angle α relative to the direction of flow MD of the toilet paper as shown in FIG. 2, it is desirable that the direction LD in which the recesses on the second sheet 12 are arranged be angled counterclockwise by an angle β relative to the direction of flow MD of the toilet paper as shown in FIG. 12. Of course, the direction LD in which the recesses on the first sheet 11 are arranged may be angled counterclockwise, and the direction LD in which the recesses on the second sheet 12 are arranged may be angled clockwise. In particular, it is preferable that the embossing pattern on the second sheet be an embossing pattern that is symmetrical to the embossing pattern on the first sheet 11 with the direction of flow MD of the toilet paper as the axis of symmetry. With such embossing patterns on the first sheet 11 and the second sheet 12, as in toilet paper shown in Figure 12, the direction LD in which the recesses 32 are arranged and the direction RD in which the valley grooves extend on the first sheet 11, and the direction LD in which the recesses 32 are arranged and the direction RD in which the valley grooves extend on the second sheet 12 do not coincide with the flow direction of the toilet paper, and without adjusting the positions of the recesses 32 on the first sheet 11 and the second sheet 12 in the flow direction MD of the toilet paper, the number of overlaps between the recesses 32 on the first sheet 11 and the recesses 32 on the second sheet 12 can be reduced to 80% or less, making it less likely that the recesses will interfere with each other or invert, and further eliminating crushing, collapse, and inversion of the recesses.

[0037] On the other hand, in the toilet paper 10 of this embodiment, it is desirable that the height difference D1 between the deepest part of the recessed portion 32 and the shallowest part of the valley groove 35 in at least the first sheet 11 is 0.01 to 0.30 mm. More preferably, it is 0.01 to 0.25 mm, and particularly preferably 0.01 to 0.20 mm. This range of height difference D1 can be considered very narrow. When the height difference D1 between the deepest part of the recessed portion 32 and the shallowest part of the valley groove 35 is 0.01 to 0.30 mm, the recessed portions are less likely to be crushed or collapsed, or to have convexly inverted portions. In long double-embossed toilet rolls, the formation of crushed or collapsed recessed portions and convexly inverted recessed portions is thought to be due in part to interference between the convex portions when sheets with concave and convex shapes formed by embossing are stacked together, tension during sheet transport and winding, and inversion of the recessed portions caused by tension after roll formation. In particular, in an embossed pattern having recesses and valley grooves extending in all directions from the recesses to connect the recesses, it is believed that convex portions are likely to be formed by inversion when the recesses are pulled along the valley grooves on all four sides when the toilet paper is wound into a roll or in the state of the roll after being wound. In an embossed pattern having such recesses and valley grooves extending in all directions from the recesses to connect the recesses, by reducing the height difference between the deepest part of the recess 32 and the shallowest part of the valley groove 35 to 0.01 to 0.30 mm as in this embodiment, inversion due to pulling is less likely to occur, and in combination with the other paper quality configurations and roll configuration, crushing, collapse, and formation of convex portions due to inversion of the recesses are improved.

[0038] If the embossed pattern on the second sheet 12 also has recesses 32 and valley grooves 35 extending in all directions from the recesses 32 and connecting the recesses 32, the difference in height between the deepest part of the recesses 32 and the shallowest part of the valley grooves 35 is preferably 0.01 to 0.30 mm, as with the first sheet 11. A height difference of 0.05 to 0.28 mm is particularly preferred, and 0.1 to 0.25 mm is even more preferred. The second sheet 12 also improves the collapse, crumbling, and turning over of the recesses, thereby reducing differences in paper quality and feel between the front and back of the toilet paper.

[0039] To achieve the difference between the deepest points of the recesses 32 and the shallowest points of the valley grooves 35 within the above range, the height difference between the highest points of the protrusions for forming the recesses and the deepest points of the ridges for forming the valley grooves formed on the embossing roll used during embossing should be 0.01 to 0.3 mm, preferably 0.05 to 0.2 mm or less, and particularly preferably 0.07 to 0.13 mm. At least when the height difference between the highest points of the protrusions for forming the recesses and the deepest points of the ridges for forming the valley grooves formed on the embossing roll used during embossing is 0.07 to 0.13 mm, the difference between the deepest points of the recesses and the shallowest points of the valley grooves can be in the range of 0.01 to 0.30 mm in the sheet according to the present invention.

[0040] The height difference between the deepest part of the recess 32 and the shallowest part of the valley groove 35 in this embodiment is measured using a one-shot 3D measuring macroscope VR-3200 or an equivalent device manufactured by Keyence Corporation, and image analysis software "VR-H1A" or an equivalent software. Note that, in the past, with double-embossed toilet paper, it was considered impossible or extremely difficult to measure the depth due to the crushing, crumbling and reversal of the recess, as described above, but with the toilet roll of this embodiment, the crushing, crumbling and reversal of the recess are improved, and further, by devising a measurement method, measurable recesses can be selected.

[0041] Measurement conditions are a magnification of 12x and a field of view of 24mm x 18mm. The sample used for measurement is a cut taken between the perforations 10m from the end of the winding, excluding the tail seal, and separated into a first sheet 11 and a second sheet 12. The sample size is approximately 25mm long x 50mm wide. The sample is set on the measurement table so that there are no wrinkles or undulations that may occur when the sample is placed on the measurement table, and it is held down in a position that does not affect the measurement field of view. For example, the sheet can be held down using a ring-shaped holder while being taut, without excessive tension.

[0042] The measurement procedure uses the above-mentioned equipment and software to select a recess suitable for confirming its shape and its difference in elevation from its surroundings, with reference to the colors representing elevations in the image obtained from a planar perspective. In other words, a recess that is nearly ideally formed by embossing is selected. Then, as shown in FIG. 8 , a measured profile curve is obtained along line segments A1 and A2 in the direction along the valley groove 35 of the selected recess 32 in the image shown from a planar perspective. Surface roughness components with wavelengths shorter than λc: 800 μm (where λc is the "filter defining the boundary between the roughness component and the waviness component" as described in JIS-B0601, "3.1.1.2") are removed from this measured profile curve using a low-pass filter, resulting in a waviness curve Q1 as shown in FIG. 9 . For each of the undulation curves A1 and A2, the difference between the average value of the shallowest parts S1 and S2 of the two valley grooves 35 and the deepest part G1 is calculated, and this average value is taken as the height difference between the deepest part of the recess 32 and the shallowest part of the valley groove 35. The positions of the shallowest parts S1 and S2 of the valley groove 35 and the position of the deepest part G1 on the undulation curve Q1 are determined visually with reference to the curve of the curve, an image of the recess shown from a planar perspective, and the line segments A1 and A2. The above measurements are performed for three embossments, and the average value is taken as the final height difference.

[0043] The depth of the deepest part of the recesses 32 in the first sheet 11 is preferably 0.02 to 0.5 mm, more preferably 0.03 to 0.3 mm, and particularly preferably 0.04 to 0.14 mm. If the depth is 0.02 to 0.5 mm, the recesses are less likely to collapse, be crushed, or be inverted to form convex portions, while still providing sufficient design.

[0044] The depth of the deepest portion of the recesses 32 in the second sheet 12 is desirably 0.02 to 0.5 mm, similar to that of the first sheet 11. Preferably, it is 0.03 to 0.3 mm, and particularly preferably 0.04 to 0.14 mm. It is particularly desirable to set the depth of the deepest portion of the recesses 32 in the second sheet 12 within the above range, regardless of the shape of the recesses 32 or the presence or absence of valley grooves 35. In the recesses 32 formed in the second sheet 12, the convex portions corresponding to the recesses 32 face the convex portion-forming surface of the first sheet 11. Therefore, the convex portions corresponding to the recesses in the second sheet 12 may press against the convex portions corresponding to the recesses in the first sheet 11, causing the recesses in the first sheet 11 to invert or collapse. Setting the depth of the recesses 32 in the second sheet 12 within the above range also reduces interference with the convex portions corresponding to the recesses in the first sheet 11. This is particularly effective when the paper quality, such as the basis weight and paper thickness, of the sheet according to the present invention and the winding density, as described below, are considered.

[0045] In order to set the depth of the deepest part of the recesses 32 within the above range, the height of the highest part of the protrusions for forming the recesses formed on the embossing roll used during embossing is 0.05 to 1.3 mm, preferably 0.3 to 1.0 mm, and particularly preferably 0.5 to 0.9 mm. At least in the sheet according to the present invention, the depth of the deepest part can be set within the above range when the height of the highest part of the protrusions for forming the recesses formed on the embossing roll used during embossing is 0.05 to 1.3 mm.

[0046] The depth D2 of the deepest portion of the recess 32 according to this embodiment is measured using a Keyence Corporation OneShot 3D Measuring Macroscope VR-3200 or an equivalent instrument and image analysis software "VR-H1A" or an equivalent software, similar to the height difference D1 between the deepest portion of the recess 32 and the shallowest portion of the valley groove 35. The measurement procedure, sample collection, sample placement, and measurement method are the same as those for the height difference D1 between the deepest portion of the recess 32 and the shallowest portion of the valley groove 35. However, as shown in FIG. 8, the measurement position is a position that straddles the non-recessed portion 34, the recess 32, and the non-recessed portion 34 other than the valley groove 35, and a measured cross-sectional curve is obtained along lines B1 and B2 at this position. Then, by performing the same processing as for the height difference D1 between the deepest portion of the recess 32 and the shallowest portion of the valley groove 35, a waviness curve Q2 as shown in FIG. 10 is obtained. For each of the undulation curves B1 and B2, the difference between the average value of the boundary positions P1 and P2 between the two non-recessed portions 34 and the recessed portions 32 and the deepest portion G2 is calculated, and this average value is taken as the depth D2 of the deepest portion of the recessed portions 32. The positions of the boundary positions P1 and P2 between the non-recessed portions 34 and the recessed portions 32 on the undulation curve Q2 and the position of the deepest portion G1 are determined visually with reference to the curve of the curve, an image of the recessed portions shown from a planar perspective, and the line segments B1 and B2. The above measurements are performed for three embossments, and the average value is taken as the final height difference.

[0047] On the other hand, the width L4 of the recess 32 in the first sheet 11 is preferably 1.15 to 1.31 mm. The width L4 of the recess 32 is the distance between the opposing edges in the case of a rectangle, a rounded rectangle, or a four-pointed star, as shown in Figure 3, and is the diameter in the case of a circle, and is the major axis and minor axis in the case of an ellipse. If the width is 1.15 to 1.31 mm, the inverted portion of the recess 32 is reduced while maintaining sufficient design.

[0048] The width of the recesses 32 in the second sheet 12 is preferably 1.15 to 1.31 mm, similar to that of the first sheet 11. The area of ​​the recesses is also preferably in the same range as that of the first sheet 11. The recesses in the second sheet 12 are also prevented from being crushed, crumbled, or turned upside down, and differences in paper quality and feel between the front and back of the toilet paper are reduced.

[0049] To set the width L4 of the recesses within the above range, the width of the convex portions for forming the recesses formed on the embossing roll used during embossing is set to approximately 1.15 to 1.31 mm, and the nip pressure during embossing is adjusted.

[0050] The width of the recess 32 according to this embodiment is also measured using a Keyence Corporation One-Shot 3D Measuring Macroscope VR-3200 or equivalent and image analysis software "VR-H1A" or equivalent software. The measurement procedure, sample collection, sample placement, and height difference between the deepest part of the recess 32 and the shallowest part of the valley groove 35 are the same. The width of the recess is measured by visually checking the edges of the recess and measuring the distance between the edges, using the colors representing the heights in the image shown in the obtained plan view as a reference. In this case, the measured cross-sectional curve and waviness curve of the line portion can be used as a reference to extend beyond the edges.

[0051] Furthermore, in the first sheet 11, the spacing (pitch) L5 between the recesses 32 is preferably 5.05 to 5.35 mm. This spacing L5 between the recesses 32 is the distance between adjacent recesses 32 without a valley groove 35 in between, and is the spacing in the direction in which the recesses 32 are aligned on a straight line according to this embodiment. When the spacing L5 between the recesses 32 is 5.05 to 5.35 mm, the formation of convex portions due to crushing, collapse, and inversion of the recesses is less likely to occur. Furthermore, the difference in shape between the recesses and non-recesses is sufficiently visible, resulting in excellent design.

[0052] The spacing (pitch) between the recesses in the second sheet is also desirably 5.05 to 5.35 mm, similar to that of the first sheet 11. This prevents the recesses in the second sheet from being crushed, crumbled, or turned over, and reduces the difference in paper quality and feel between the front and back of the toilet paper 10.

[0053] The distance L5 (pitch) between the recesses 32 is set to approximately 5.05 to 5.35 mm, which is the distance (pitch) between the convex portions for forming the recesses on the embossing roll used during embossing, and the nip pressure during embossing can be adjusted.

[0054] The distance L5 (pitch) between the recesses 32 in this embodiment can also be measured using a Keyence Corporation OneShot 3D Measuring Macroscope VR-3200 or equivalent and image analysis software "VR-H1A" or equivalent software. The measurement procedure, sample collection, sample placement, and the elevation difference between the deepest part of the recess 32 and the shallowest part of the valley groove 35 are the same. The distance L5 between the recesses 32 is measured by visually checking the edges of the recesses while referring to the colors representing the elevations in the image shown from the obtained planar perspective. In this case, the measured cross-sectional curve and waviness curve of the line portion can be used as a reference to ensure that the distance exceeds the distance between the edges of the two recesses.

[0055] The area of ​​the recesses 32 and the embossed area ratio (total area of ​​recesses / total area of ​​sheets) in the toilet paper 10 of this embodiment are not necessarily limited, but the area of ​​the recesses 32 in the first sheet 11 and the second sheet is 0.5 to 8 mm ２ is preferable, and 1.0 to 3.2 mm ２ The embossed area ratio is preferably 15 to 28%, and more preferably 8 to 14%.

[0056] The area of ​​the recesses 32 and the embossed area ratio according to this embodiment are also measured using a one-shot 3D measuring macroscope VR-3200 manufactured by Keyence Corporation or an equivalent device, and image analysis software "VR-H1A" or an equivalent software. The embossed area ratio is calculated from the area of ​​the recesses and the number of recesses in an area of ​​10 cm in the flow direction. As with the width of the recesses 32, the area is measured by visually checking the edges of the recesses with reference to the color representing the heights and lows in the image shown from a planar perspective, and then calculating the area of ​​the recesses. In this case, the height profile of the line portion that extends beyond the edges can be used as a reference.

[0057] On the other hand, the toilet roll of this embodiment has a winding density of 0.75 to 1.6. A winding density within this range can reduce the crushing, crumbling, and inversion of recesses caused by embossing, due to the relationship between the degree of compaction of the toilet paper during and after winding, and the basis weight and embossing pattern. The winding density is calculated by (paper thickness x winding length x number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is also calculated by {cross-sectional area of ​​the roll's winding diameter (outer diameter) L1} - (cross-sectional area of ​​the paper tube's outer diameter L3).

[0058] On the other hand, the tensile strength of the toilet paper of this embodiment is not necessarily limited, but the dry tensile strength in the longitudinal direction is preferably 250 cN / 25 mm or more and 360 cN / 25 mm or less, and the dry tensile strength in the transverse direction is preferably 65 cN / 25 mm or more and 120 cN / 25 mm or less. With such dry tensile strengths, the convex portions are less likely to collapse, be crushed, or turn over, and the necessary firmness can be obtained during use.

[0059] Dry tensile strength is a value measured based on JIS P 8113 (2006) and is measured as follows. Test specimens are cut to approximately 25 mm (±0.5 mm) wide x 150 mm long in both the longitudinal and transverse directions. Test specimens are measured as multi-ply. The tester used is a Minebea Co., Ltd. load cell tensile tester TG-200N or an equivalent. The grip spacing is 100 mm, and the tensile speed is set to 100 mm / min for longitudinal measurements and 50 mm / min for transverse measurements. Measurements are performed by clamping both ends of the test specimen into the grips of the tester, applying a tensile load in the vertical direction to the paper piece, and reading the indicated value (digital value) when the paper breaks. Five sets of samples are prepared in both the longitudinal and transverse directions, and measurements are performed five times each. The average of these measurements is taken as the dry tensile strength in each direction.

[0060] On the other hand, the toilet paper 10 according to this embodiment may contain known dry strength agents, dry strength agents, and temporary wet strength agents, but because strength agents can particularly reduce softness and water disintegrability, it is preferable that these strength agents are not added. Therefore, it is preferable that the toilet paper according to this embodiment does not contain at least one, preferably two, and particularly all of the dry strength agents, dry strength agents, and temporary wet strength agents.

[0061] In addition, the toilet paper 10 of this embodiment preferably contains a softener. Examples of softeners include fatty acid ester-based softeners and cationic fatty acid amide-based softeners. The fatty acid ester-based softener may be either a cationic fatty acid ester-based compound or a nonionic fatty acid ester-based compound, and multiple types may be added. Examples of cationic fatty acid amide-based softeners include a reaction product of an amide compound obtained by reacting polyalkylene polyamines with monocarboxylic acids and epihalohydrin. The content of the softener is not necessarily limited, but it is desirable to include 0.5 to 4.0 kg / t of pulp.

[0062] Here, the toilet roll 1 of this embodiment has a TS750 value of the outer surface side of the roll of the first sheet 11 measured by a tissue softness measuring device TSA of 12.0 dBV at a winding length of 37.5 to 60 m. ２ rms, 13.0 dBV for winding lengths of 75 to 125 m ２ It is desirable that the rms is less than or equal to this.

[0063] The tissue softness measuring device TSA according to this embodiment is a tissue softness measuring device TSA manufactured by Emtec Electronic GmbH of Germany (Japan distributor: Nippon Luft Co., Ltd.) or an equivalent device. TS750 according to this embodiment is a value measured by this tissue softness measuring device TSA manufactured by Emtec. TS750 is the intensity of the first maximum peak in the spectrum seen from the low frequency side, obtained when a bladed rotor is pressed from above onto a sample placed on a sample stage with a pressing pressure of 100 mN, and then the sample stage is rotated at a rotation speed of 2.0 rpm, and the vibration of the sample stage is measured with a vibration sensor. TS750 is a parameter that is affected by "smoothness / roughness." When measuring using the tissue softness measuring device TSA according to this embodiment, a sample is processed into a circle with a diameter of approximately 112.8 mm using an Emtec sample punch, and the software used for analysis and digitization is the Emtec Measurement System.

[0064] Furthermore, the toilet paper 10 of this embodiment preferably has a softness of 3.0 cN / 100 mm or less, and particularly preferably 2.8 to 1.0 cN / 100 mm. This softness is measured using a handle-o-meter method in accordance with JIS L 1096 (2010) Method E. If the softness is within the above range, the quality, such as surface texture and softness, is sufficient.

[0065] The pulp fibers in the toilet paper 10 in this embodiment are not particularly limited, but preferably comprise 70-100% virgin pulp by mass and 0-30% recycled paper pulp by mass. Blending recycled paper pulp allows for more cost-effective production compared to 100% virgin pulp by mass. Furthermore, recycled paper pulp tends to be finer in the process of recycling pulp from recycled paper than the pulp fibers before recycling. Due to this fiber nature, the fibers become denser without increasing the paper thickness, but the finer fibers make it difficult to achieve paper strength. Excessive blending reduces texture, such as flexibility and smoothness. Therefore, in consideration of the characteristics of recycled paper pulp, it is best to set the blend ratio in the range of 0-30% by mass. However, from the standpoint of paper strength and quality, 100% virgin pulp is particularly desirable. In this case, the virgin pulp is preferably a combination of softwood kraft pulp (NBKP) and hardwood kraft pulp (LBKP). The blending ratio of these is preferably NBKP:LBKP 20:80 to 50:50. When recycled paper pulp is blended, the type is not necessarily limited, but recycled paper pulp made from recycled milk carton paper or high-quality recycled paper is particularly desirable. These pulps contain a large amount of softwood kraft pulp (NBKP) or hardwood kraft pulp (LBKP) derived from the raw materials, which makes it easy to develop paper strength.

[0066] Next, examples and comparative examples of toilet rolls according to the present invention were prepared, and physical properties were measured and sensory evaluations were performed on the collapse of recesses, etc. The toilet paper of the examples and comparative examples was a two-ply double embossed product in which recesses and protrusions corresponding to the recesses were formed by embossing on the sheets located on the outer surface and inner surface of the roll, and the sheets were laminated so that the protrusion-formed surfaces faced each other. Base paper made of 100% virgin pulp was used for both the examples and comparative examples. Example 1, Example 1C, and Comparative Example 1 had a winding length of 45 m, which was approximately 1.5 times that of a regular product. Example 2, Example 2C, and Comparative Example 2 had a winding length of 60 m, which was approximately twice that of a regular product. Example 3, Example 3C, and Comparative Example 3 had a winding length of 80 m, which was approximately three times that of a regular product. Example 4, Example 4C, and Comparative Example 4 had a winding length of 106 m, which was approximately 4.2 times that of a regular product. The embossing pattern of the first sheet in Examples 1, 2, 3, and 4 was the pattern shown in FIG. 2, where the recesses were four-pointed star-shaped, and the angle between the direction LD of the recesses and the machine direction MD was -30 degrees. The embossing pattern of the second sheet was the pattern shown in FIG. 11, where the recesses were four-pointed star-shaped, and the angle between the direction LD of the recesses and the machine direction MD was 30 degrees. Furthermore, in the embossing patterns of the first sheets in Examples 1, 2, 3, and 4, the direction in which the recesses were arranged and the extension direction of the valley grooves did not coincide with the machine direction of the toilet paper. The embossing pattern of the first sheets in Examples 1C, 2C, 3C, and 4C was the pattern shown in FIG. 2, where the recesses were four-pointed star-shaped, and the angle between the direction LD of the recesses and the machine direction MD was -30 degrees. The embossing pattern of the second sheet is the pattern shown in Figure 12, where the shape of the recesses is square, the shape of the recesses is four-pointed star, and the angle between the direction LD of the recesses and the machine direction MD is 60 degrees. Furthermore, in the embossing patterns of the first sheet according to Examples 1C, 2C, 3C, and 4C, the direction in which the recesses are arranged and the extension direction of the valley grooves do not coincide with the machine direction of the toilet paper.The toilet paper according to Comparative Examples 1 to 4 has the embossing pattern shown in FIG. 13 , and the recesses on both the outer sheet (first sheet in the table) and the inner sheet (second sheet in the table) of the roll are four-pointed star-shaped, with the direction of the recesses aligned with the direction of toilet paper flow (the angles corresponding to ∠α and ∠β are 0 degrees). The recesses on the outer sheet (first sheet in the table) and the inner sheet (second sheet in the table) of the roll are also designed to be aligned in the same direction. Furthermore, the base paper for the toilet paper according to the Examples and Comparative Examples does not contain a dry strength agent, a wet strength agent, or a temporary wet strength agent. The softener was used in the same blend ratio in the Examples and Comparative Examples. Sensory evaluation of the collapse of the recesses, etc., was performed by visually inspecting and evaluating the state of the recesses within a 25 mm x 50 mm range located 10 m from the outside of the roll and the occurrence of vertical wrinkles within the range. There were five test subjects, and the scores were calculated by rounding off the average value to the nearest 0.5. The evaluation points for "depression, crumbling, and inversion of recesses" were as follows: "depression, crumbling, and inversion are observed in all recesses" 1 point, "depression, crumbling, and inversion are observed in almost all recesses" 2 points, "depression, crumbling, and inversion are observed in recesses" 3 points, and "depression, crumbling, and inversion are not observed in recesses" 4 points. For "vertical wrinkles," the evaluation points were as follows: "vertical wrinkles are observed across the entire width of the roll" 1 point, "three or more vertical wrinkles are observed, but not across the entire roll" 2 points, "one to two vertical wrinkles are observed" 3 points, and "no vertical wrinkles are observed" 4 points.

[0067]

[0068] As shown in Table 1, when comparing Example 1, Example 1C with Comparative Example 1, Example 2, Example 2A with Comparative Example 2, Example 3, Example 3A with Comparative Example 3, Example 4, and Example 4A with Comparative Example 4, which are all wound at the same length, the TS750 values ​​of the Examples are superior to those of the Comparative Examples. This indicates that the Examples are evaluated as having superior surface smoothness. Furthermore, in the sensory evaluation test, the Comparative Examples 2 to 4, which were wound at lengths of 2x or more, were evaluated as "crushed, crumbled, and turned over in all recesses," whereas the Examples were evaluated as "no crushed, crumbled, or turned over in recesses" even at winding lengths equivalent to 4x. Note that the depth of recesses in the table is a design value for those that could not be measured due to crushed, crumbled, or turned over in recesses. From the above results, it can be seen that the toilet roll according to the present invention improves the crushing and crumble of recesses and the formation of convexly turned recesses, thereby improving smoothness and fluffy softness.

[0069] 1... toilet roll, 10... toilet paper, 11... first sheet, 12... second sheet, 20... paper tube (tube core), 31... convex portion, 32... concave portion, 34... non-convex portion, 35... valley groove, L1... toilet roll winding diameter (diameter), L2... width of toilet roll, L3... diameter of toilet roll tube, L4... width of concave portion, L5... spacing between concave portions, LD... direction of concave portions, RD... extension direction of valley groove, MD... direction of toilet paper flow, ∠α... angle between the direction of concave portions of the first sheet and the direction of toilet paper flow, ∠β... angle between the direction of concave portions of the second sheet and the direction of toilet paper flow, 110... comparative toilet paper, 111... sheet on the outer surface of the winding according to the comparative example, 112... sheet on the inner surface of the winding according to the comparative example, 132... concave portion according to the comparative example, 135... valley groove according to the comparative example.

Claims

1. A toilet roll in which two plies of double embossed toilet paper are wound around a paper tube, the first sheet having embossed recesses and protrusions corresponding to the recesses and located on the outer surface of the roll, and the second sheet having embossed recesses and protrusions corresponding to the recesses and located on the inner surface of the roll, are laminated so that the protrusion-forming surfaces face each other, the toilet roll having a roll length of 45 m or more, a roll diameter of 110 to 130 mm, and a roll density of 0.75 to 1.6, and the toilet roll having a basis weight per ply of 11.0 to 18.0 g / m ２ a paper thickness of the two plies is 125 to 205 μm, a paper thickness of the first sheet is 65 to 120 μm, an embossed pattern on at least the first sheet has recesses arranged in a straight line at predetermined intervals, and valley grooves that are shallower than the recesses and extend in all directions from the recesses to connect the recesses, and the direction in which the recesses are arranged and the direction in which the valley grooves extend do not coincide with the direction in which the toilet paper flows.

2. The toilet roll according to 1, wherein the direction in which the recesses are arranged is at an angle of between ±10 degrees and ±45 degrees relative to the direction of flow of the toilet paper.

3. The toilet roll according to claim 1 or 2, wherein the shape of the recesses in the first sheet is a square or a four-pointed star, and the valley grooves extend from the four vertices of the recesses.

4. The toilet roll according to claim 3, wherein the distance between the recesses of the first sheet is 5.05 to 5.35 mm.

5. The toilet roll according to claim 3 or 4, wherein the width of the recessed portion of the first sheet is 1.15 to 1.31 mm.

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