Toilet roll

Abstract

To provide a toilet roll which is toilet paper suitable for use in a toilet with a flushing function and is easily elongated SOLUTION: The toilet paper includes a first sheet and a second sheet, the first sheet including a first concave portion and a second concave portion that are formed by embossing and have different depths, the first concave portion having a depth of 0.17 to 0. 120mm, the second concave portion having a depth smaller than the depth of the first concave portion, the first concave portion and the second concave portion having different depths, the first concave portion and the second concave portion having a winding length of 34.5 to 50m, the winding length being less than or equal to 23mm; The toilet paper is wound around the paper core such that the first sheet is on the outer surface side.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a toilet roll. [Background technology]

[0002] As flushing toilets become more common, there is a growing demand for toilet paper that is suitable for use in flushing toilets.

[0003] In toilets with flushing functions, the areas where defecation and urination occur are washed with warm or cold water, so it is necessary to wipe off the feces and urine along with the moisture that has adhered to the skin during the wash.

[0004] Therefore, toilet paper is required to have the ability to wipe away moisture from skin, high absorbency, and a sense of security when wiping. Laminate embossing is known as a technique for improving the ability to wipe away moisture from skin. Laminate embossing is a technique in which embossed plies are laminated with adhesive, which increases strength, thickness, and water penetration resistance.

[0005] On the other hand, toilet paper is generally sold commercially in the form of toilet rolls wound around paper tubes. In recent years, toilet rolls have become longer in length, with toilet paper wound around paper tubes becoming longer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6021532 [Patent Document 2] Japanese Patent Application Publication No. 2019-10366 Summary of the Invention [Problem to be solved by the invention]

[0007] However, toilet paper made using laminate embossing technology is not suitable for long lengths as it is because the paper becomes too thick.

[0008] On the other hand, if the basis weight of each ply is reduced to make the paper longer, the softness, fluffiness, and smoothness of the texture tend to decrease. In particular, if the basis weight is reduced in toilet paper made using laminate embossing technology, the paper tends to have a crisp, stiff feel caused by the adhesive.

[0009] Furthermore, when used as a toilet roll, the surface of the roll feels uncomfortable to the touch, and users tend to get the impression that it is harder.

[0010] Therefore, the main object of the present invention is to provide a toilet roll that has excellent wiping ability for moist skin, high water absorbency, and a sense of security when wiping, and that is suitable for long lengths of toilet paper with a sufficient texture such as softness, fluffiness, and smoothness, and that has a firmness in the roll that makes it clear that it is a long length, while also having an excellent feel to the touch on the roll surface. [Means for solving the problem]

[0011] The first solution to the above problem is A toilet roll in which two plies of toilet paper are wound around a paper tube, with at least a portion of the two sheets being bonded together via embossed recesses, The winding diameter is 120 mm or less, and the winding length is 34.5 to 55 m, The toilet paper has a basis weight per ply of 13.0 to 16.0 g / m 2 The thickness of the two plies is 175 to 238 μm. The toilet paper, A first sheet having recesses formed by embossing and a second sheet, The embossing density of the recesses on the first sheet is 2 to 14 / cm 2 and The toilet paper is wound around the paper tube with the first sheet facing outward. This toilet roll is characterized by the following:

[0012]

[0013] The second method is In the toilet roll according to the first aspect, the second sheet has recesses formed by embossing, and the recesses are shallower in depth than the first recesses formed in the first sheet.

[0014] The third method is Roll winding density: 0.74 to 1.30 m / cm 2 and the roll density is 0.12 to 0.18 g / cm 3 The toilet roll according to the first and second aspects is as follows.

[0015] The fourth method is The toilet roll according to the first to third aspects has a roll compression degree of 0.66 to 1.50.

[0016] The fifth method is The toilet paper is a toilet roll according to the first to fourth means, which is treated with an enzyme-based paper strength agent.

[0017] The sixth method is The toilet paper is a toilet roll according to any one of the first to fifth means, which does not contain starch or cationic starch. [Effects of the Invention]

[0018] According to the present invention, there is provided a toilet roll that has excellent wiping ability for moist skin, high water absorbency, and a sense of security when wiping, and that is suitable for making long toilet paper with sufficient texture such as softness, fluffiness, and smoothness, and that has a firm hardness of the roll that allows the user to recognize that it is a long roll, while also having an excellent feel to the touch on the roll surface. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of a toilet roll according to an embodiment of the present invention. FIG. [Figure 2] FIG. 4 is a schematic diagram for explaining the procedure for measuring the embossing depth according to the present invention. [Figure 3] FIG. 1 is a schematic diagram for explaining a method for measuring MMD according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Next, embodiments of the present invention will be described in detail below with reference to the drawings.

[0021] As shown in Figure 1, the toilet roll according to this embodiment is a cylindrically shaped toilet paper roll in which two plies of water-disintegrable toilet paper 10, each consisting of a first sheet and a second sheet, are wound around a paper tube (also called a tube core) 20. Note that water-disintegrability here means that the ease of unraveling according to JIS P 4501 is 100 seconds or less.

[0022] While conventional 2-ply toilet rolls have a roll length of around 20 to 25 m, the toilet roll according to this embodiment has a roll length of 34.5 to 55 m, preferably 38 to 50 m, and is sometimes called a long product or a 1.5 to 2 times roll product.

[0023] On the other hand, the roll diameter L1 (diameter) of the toilet roll of this embodiment is 120 mm or less, preferably 107 to 119 mm. The roll diameter L1 of a toilet roll is specified as 120 mm or less in JIS P 4501, and holders for holding general toilet rolls are manufactured based on this 120 mm standard. The toilet roll of this embodiment has a roll diameter of 120 mm or less and can be set in a general holder. Here, the roll diameter L1 is a value measured using a diameter ruler manufactured by Muratec KDS Corporation or an equivalent device. The measured value is the average value of measurements taken at three different locations in the width direction. Note that the average value for products from the same production lot is the average value of five rolls. Note that the roll width L2 of the toilet roll of this embodiment is not limited, but is preferably 100 to 130 mm. The outer diameter L3 of the cardboard core is also not limited, but is 34 to 42 mm.

[0024] Here, the impression of hardness when holding a toilet roll in the hand is influenced not only by whether the roll is dense or not, but also by the collapse of the embossed recesses when the toilet paper is stretched and wound, as well as the physical properties and surface characteristics of the toilet paper. Therefore, the toilet roll according to this embodiment is a two-ply toilet paper with embossed recesses. This toilet paper has a basis weight per ply of preferably 13.0 to 17.0 g / m. 2 , more preferably 13.5 to 16.0 g / m 2 The thickness of the two plies is preferably 175 to 238 μm, and more preferably 180 to 225 μm. Within this range of basis weight and paper thickness, the wiping ability of the sheet on moist skin, high water absorbency, and a sense of security when wiping can be sufficiently improved, and further, the feel of the surface of the roll against the skin can be improved when the winding length is increased.

[0025] The basis weight (basis weight) is measured in accordance with JIS P 8124. The thickness is measured by first conditioning the test specimen under the conditions specified in JIS P 8111 (1998) for sufficient time (usually for approximately 8 hours), and then measuring the thickness of the two-ply specimen under the same conditions using a PEACOCK H-type dial thickness gauge (thickness measuring device) (manufactured by Ozaki Seisakusho). Specifically, after ensuring that there is no dust or dirt between the plunger and the measuring table, the plunger is lowered onto the measuring table, the dial thickness gauge's scale is adjusted to zero, the plunger is then raised, the sample is placed on the testing table, and the plunger is opened to 700 μm. The lever is then lowered in one go, and the gauge reading is taken. During measurement, the plunger is simply placed on the test table, not pressed down. The 10 mm diameter circular surface of the plunger terminal is positioned perpendicular to the paper surface, and the load during paper thickness measurement is approximately 70 gf. The paper thickness is measured as the average value obtained by performing 10 measurements.

[0026] Furthermore, the first sheet in the toilet paper according to this embodiment has first and second recesses of different depths formed by embossing. The first and second recesses of this first sheet are preferably formed on the same surface, and convex portions corresponding to the first and second recesses are preferably formed on the other surface. The first sheet is wound around the paper tube so that it faces outward. It is particularly preferable that the recessed surface faces outward.

[0027] Furthermore, this toilet paper may be two-ply, with the inner layer side of the first recess of the first sheet adhered to the inner layer side of the second sheet. The adhesion may be via adhesive applied to the convex portions of the first sheet corresponding to the concave portions. Alternatively, the first sheet may be pressure-bonded and integrated by embossing, known as single embossing. Regardless of whether an adhesive is used or not, and regardless of whether single embossing is used or not, when the first sheet and the second sheet are laminated and integrated, Convex portions corresponding to only the first recesses of the first sheet or to both the first recesses and the second recesses may be formed on the outer surface of the second sheet. On the other hand, the inner laminate surface side of the second recesses is preferably not bonded to the second sheet with an adhesive. Although it is not necessary for the inner laminate surface side of all the first recesses to be bonded to the second sheet, it is desirable for all recesses to be bonded from the viewpoint of ply peeling.

[0028] When an adhesive is used, either a water-based adhesive or an oil-based adhesive may be used. However, preferred adhesives are water-soluble adhesives such as PVA (polyvinyl alcohol) and CMC (carboxymethyl cellulose). In particular, CMC, a cellulose-based water-soluble adhesive, is desirable.

[0029] Alternatively, the adhesive itself may be an ink having adhesive properties, or a coloring component such as a pigment or dye may be added to the adhesive. In this case, the first recesses are colored and become visible, resulting in excellent design. Preferred coloring components include aqueous dyes such as phthalocyanine dyes and azo-based metal complex dyes. Examples of pigments include aluminum hydroxide, kaolin, talc, calcium carbonate, titanium dioxide, clay, and zinc oxide.

[0030] When the first recess and the second recess are provided, their individual shapes in plan view are not limited. In particular, it is preferable to determine the first recess in consideration of design and the like. The area of ​​each of the first recess and the second recess is not necessarily limited either. There may be a plurality of recesses with different areas. However, in a toilet roll wound into a long length, the toilet paper is particularly excellent in wiping moisture off skin, has high absorbency, provides a sense of security when wiping, and has a sufficient texture such as softness, fluffiness, and smoothness, and further provides a toilet roll that has a firm hardness while having an excellent feel to the touch on the roll surface. The preferred area of ​​the first recess is 1.00 to 22.0 mm, which is the range that is most likely to achieve the effects of the present invention. 2 , the more suitable area is 1.50~21.5mm 2 The preferred area of ​​the second recess is 0.25 to 0.75 mm 2, the more preferable area is 0.30 to 0.50 mm 2 Furthermore, the embossing density of the first recesses and the second recesses is not necessarily limited, but the preferred embossing density of the first recesses is 4 to 14 recesses / cm, which is a range that particularly easily achieves the effects of the present invention. 2 The more suitable embossing density is 7 to 11 pieces / cm 2 The preferred embossing density of the second recesses is 2 to 11 / cm. 2 The more suitable embossing density is 5 to 8 pieces / cm 2 The embossing density was measured by sampling a 50 cm section from the end of the winding, excluding the tail seal section.

[0031] On the other hand, in the toilet paper according to this embodiment, the depth of the first recesses is 0.17 to 0.23 mm. The depth of the second recesses may be shallower than the first recesses, but is preferably 0.050 to 0.090 mm. When the first recesses and second recesses have such depths, in combination with the winding diameter and winding length, the texture of the toilet paper and the texture of the roll surface are particularly improved and more favorable.

[0032] The depths of the first and second recesses were measured using a Keyence Corporation One-Shot 3D Measuring Macroscope VR-3200 or equivalent and image analysis software "VR-H1A" or equivalent. Measurements were performed at a magnification of 12x and a field of view of 24mm x 18mm. However, the magnification and field of view can be changed as needed depending on the size of the embossment (recess). The specific measurement procedure is described with reference to Figure 2. Using the software, an embossment depth (measured cross-sectional curve) profile is obtained along line segment Q1, which intersects the longest part of the periphery of one recess 40 in the image area (part X in the figure) shown in plan view. From the cross-sectional curve of this embossing depth profile, surface roughness components with wavelengths shorter than λc:800 μm (where λc is the "filter defining the boundary between roughness and waviness components" as described in JIS-B0601, section 3.1.1.2) are removed using a low-pass filter. The "contour curve Q2" of the image portion (part Y in the figure) shown from a cross-sectional perspective is obtained by determining the two recess edge points P1 and P2 where the upward curvature is strongest, and the minimum value between the recess edge points P1 and P2, and this is defined as the minimum depth value Min. Furthermore, the average value of the depth values ​​of the recess edge points P1 and P2 is defined as the maximum depth value Max. In this way, the embossing depth = maximum value Max - minimum value Min. The distance (length) between the recess edge points P1 and P2 on the XY plane is defined as the length of the longest part. The two recess edge points P1 and P2 where the upward curvature is strongest are selected visually. In making this selection, the contour E in the planar image of the recess 40 being measured may be used as a reference. Similarly, the depth of the recess is also measured at the shortest point in the direction perpendicular to the longest point, and the larger value is adopted as the depth of the recess. The above measurements are performed on any 10 embossments on the surface of the toilet paper, and the average value is used as the final embossment depth.

[0033] The area of ​​each of the first and second recesses is also measured by visually checking the outline of the embossed recesses from the 3D image obtained using the One-Shot 3D Measuring Macroscope VR-3200 or its equivalent and the image analysis software "VR-H1A" or its equivalent, and measuring the area inside the outline. This is done for any 10 embossments on the toilet paper surface, and the average value is the final area of ​​the embossed recesses.

[0034] Furthermore, in the toilet paper according to this embodiment, the MMD of the outer laminate surface of the first sheet on which the first recesses and second recesses are formed is preferably 10.0 or less. Considering the feel of the recesses, a more preferable MMD value is 8.0 to 10.0. The MMD is measured using a measuring device 100 shown in FIG. 3. The friction element is brought into contact with the surface of a measurement sample, to which a tension of 20 g / cm is applied in a predetermined direction, at a contact pressure of 25 g. The friction element is then moved 2 cm in approximately the same direction as the tension at a speed of 0.1 cm / s. The coefficient of friction at this time is measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.) or an equivalent device. The MMD is the value obtained by dividing the friction coefficient by the friction distance (movement distance = 2 cm). The friction element is made of 20 adjacent piano wires P with a diameter of 0.5 mm, and has a contact surface formed so that both the length and width are 10 mm. The contact surface is formed with a unit bulge portion, the tip of which is made of 20 piano wires P (with a curvature radius of 0.25 mm).

[0035] Furthermore, in this toilet paper, it is desirable that the second sheet also has recesses formed by embossing or the like. By forming recesses on the second sheet by embossing, the difference in elongation between the second sheet and the first sheet on which recesses and protrusions are formed is reduced, preventing the occurrence of wrinkles and paper breaks during the manufacturing process. In addition, it is easy to obtain toilet paper with a good balance between texture such as softness and thickness, making it easier to achieve the effects of the present invention. However, it is desirable that the area of ​​the recesses on the second sheet is smaller than the first recesses on the first sheet and approximately the same as the second recesses. In addition, it is desirable that the embossing density is denser than the second recesses on the first sheet. Specifically, the suitable area of ​​the recesses on the second sheet is 0.25 to 0.75 mm 2 , the more preferable area is 0.30 to 0.50 mm 2 Furthermore, the preferred embossing density of the recesses in the second sheet is 2 to 12 / cm. 2 The more suitable embossing density is 2 to 11 pieces / cm 2 The optimum embossing density is 4 to 8 pieces / cm 2 is.

[0036] Furthermore, it is desirable that the softness of this toilet paper is 1.8 to 2.7 cN / 100 mm, more preferably 2.0 to 2.6 cN / 100 mm. This softness is measured based on the handle-o-meter method in accordance with JIS L 1096 (2010) Method E.

[0037] In the toilet paper of this embodiment, when the MMD and softness are within the above ranges, the texture and the texture of the roll surface are particularly improved and favorable.

[0038] Here, the toilet roll according to this embodiment has a roll winding density of 0.74 to 1.30 m / cm 2 and the roll density is 0.12 to 0.18 g / cm 3 It is desirable that:

[0039] The roll 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 roll's winding diameter (outer diameter) L1} - (cross-sectional area of ​​the cardboard core outer diameter L3). Therefore, for example, if the winding length is 46 m, there are 2 plies, the winding diameter L1 is 115 mm, and the cardboard core outer diameter L3 is 38 mm, the winding density is (46 m x 2) ÷ {3.14 x (115 mm ÷ 2 ÷ 10)} 2 -3.14×(38mm÷2÷10) 2}=0.99m / cm 2 This becomes:

[0040] The roll density is expressed as (roll mass) ÷ (roll volume). The roll mass is the mass of toilet paper roll per 114 mm of roll width. The roll volume is expressed as [{cross-sectional area of ​​the roll's winding diameter (diameter) L1} - (cross-sectional area of ​​the paper core outer diameter L3)] × roll width (converted per 114 mm). For example, if the roll weight (excluding the core) per 114 mm of roll width is 152 g, the winding diameter L1 = 115 mm, and the paper core outer diameter L3 = 38 mm, the roll density is 152 g ÷ [{3.14 × (115 mm ÷ 2 ÷ 10) 2 -3.14×(38mm÷2÷10) 2}×(114mm÷10)]=0.14g / cm 3 This becomes:

[0041] The roll winding density and roll density are indicators of how tightly or loosely a toilet roll is wound. If it is too loose, the area around the paper core will be prone to excessive deformation, such as protruding, and if it is too stiff, the toilet paper will feel stiff when held in the hand.

[0042] Furthermore, the toilet roll according to this embodiment preferably has the above-mentioned roll winding density and roll density, and further preferably has a roll compression degree of 0.66 to 1.50.

[0043] The degree of roll compression is expressed as (cross-sectional area calculated based on paper thickness) / (cross-sectional area of ​​the roll). The method for calculating (cross-sectional area of ​​the roll) is the same as for (cross-sectional area of ​​the roll) in the roll winding density described above. Furthermore, (cross-sectional area calculated based on paper thickness) is a value calculated by (paper thickness) x (winding length). This value of (cross-sectional area calculated based on paper thickness) does not take into account the gaps that form when the toilet paper is wound around the paper core. On the other hand, the value of (cross-sectional area of ​​the roll) does take into account the gaps that form when the toilet paper is wound around the paper core. Therefore, the degree of roll compression, which is expressed as the ratio of (cross-sectional area calculated based on paper thickness) to (cross-sectional area of ​​the roll), is also an indicator of how tightly or loosely the toilet roll is wound. And, as mentioned above, if it is too loose, it will be prone to excessive deformation, such as the area near the paper core popping out, and if it is too stiff, the toilet roll will feel stiff when held in the hand. The roll winding density is easily affected by the number of plies, and the roll compression degree is easily affected by the paper thickness.

[0044] The above-mentioned roll density and roll winding density, in particular in combination with the texture due to the toilet paper structure, further improves and improves the texture of the roll surface.

[0045] On the other hand, in the toilet paper according to this embodiment, it is desirable that 55% by mass or more, preferably 60% to 70% of the fibers constituting the toilet paper are hardwood-derived pulp. Hardwood-derived pulp has short fiber length and is likely to improve the texture of the paper surface. The toilet roll according to this embodiment tends to feel stiff when wound long, but by using 55% by mass or more of hardwood-derived pulp, the smoothness is increased and the stiffness is less likely to be felt. The texture during use is also improved. Note that LBKP (hardwood kraft pulp), LUKP, LOKP, etc. are known as hardwood-derived pulp, but bleached LBKP is desirable. Note that the fiber other than hardwood-derived pulp is desirably softwood-derived pulp. In this case, chlorine-bleached NBKP (softwood kraft pulp) is desirable.

[0046] The toilet paper according to this embodiment preferably contains or is acted upon by a temporary wet strength agent and a dry strength agent. The dry strength agent increases the dry tensile strength, making it easier to achieve sufficient strength and perforation strength during use. Furthermore, when winding a paper tube to a longer length, the paper is less likely to break even if the winding tension during manufacturing is increased. Furthermore, increased dry tensile strength also increases water absorption. On the other hand, increasing the dry tensile strength using only a dry strength agent reduces water disintegrability and makes the paper hard, which tends to reduce texture and usability. The temporary wet strength agent does not disintegrate in water upon short-term contact with moisture during wiping, and has sufficient water disintegrability against the amount of moisture that accumulates in the trap in a water-based toilet, while slightly reducing paper strength compared to when only a dry strength agent is used, improving texture. Therefore, by including a temporary wet strength agent in addition to a dry strength agent, the texture of the toilet paper is improved, and the toilet paper is particularly strong enough to wipe away moisture from the skin after using a shower toilet, has high moisture absorbency that gives a sense of security, and is less likely to allow moisture to penetrate into the hands.

[0047] The content of the temporary wet strength agent is not necessarily limited, but is preferably 0.01 to 0.04% by mass. This temporary wet strength agent is preferably added during manufacturing. The type of temporary wet strength agent is not necessarily limited, but examples include polyacrylamide resin, polyamidepolyamine epichlorohydrin resin, urea resin, acid colloid-melamine resin, thermally crosslinkable coating PAM, Seiko PMC Corporation's TS-20 and TS4070, polymeric aldehyde-functional compounds such as glyoxylated polyacrylamide, cationic glyoxylated polyacrylamide, copolymers of acrylamide monomers modified with divalent aldehydes such as glyoxal and other copolymerizable unsaturated monomers, and dialdehyde starch.

[0048] The content of the dry strength agent is not necessarily limited, but is preferably 0.005 to 0.15% by mass. This dry strength agent is preferably added internally. The type of dry strength agent is not necessarily limited, but examples include polyacrylamide, CMC (carboxymethyl cellulose) or its salts such as sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, and zinc carboxymethyl cellulose. However, starch and cationized starch are not desirable because they tend to make the surface of the toilet paper feel crisp and hard.

[0049] A particularly preferred dry strength agent is an enzyme-based strength agent. The toilet paper in the toilet roll of this embodiment is particularly suitable for containing this enzyme-based strength agent. Unlike starch and other strength agents, which act like adhesives to add strength, enzyme-based strength agents contain enzymes that decompose polysaccharides, fibrillating fibers and fluffing the surface and interior of the fibers. Therefore, the action of the enzyme-based strength agent does not inhibit hydrogen bonding, increasing the proportion of cellulose fibers alone, which, combined with the entanglement of fibers, particularly on the surface, increases paper strength. Furthermore, while enzyme-based strength agents increase paper strength in this way, they do not inhibit hydrolysis. This improves the texture of the toilet paper, resulting in an excellent roll surface texture and excellent water absorbency, especially when the roll length is long and the roll density and roll winding density are high. The presence of the enzyme-based strength agent in the toilet paper can be confirmed by high-performance liquid chromatography (HPLC) or mass spectrometry (LC / MS) to determine whether the enzyme-based strength agent is acting on the fibers.

[0050] Here, examples of the enzyme-based paper strength agent according to the present invention include those containing at least one of cellulase, hemicellulase, and xylanase. Examples of paper strength agents containing such enzymes include Hercobond 8922 (manufactured by Riken Green Co., Ltd.), Hercobond EZ4423 (manufactured by Riken Green Co., Ltd.), "Celluleucin T2" (manufactured by HPI Corporation), "Meicelase (registered trademark)" (manufactured by Meiji Seika Pharma Co., Ltd.), "Novozyme (registered trademark) 188" and "Celluclast" (manufactured by Novozymes), and "Multifect CX10L, B, GCc, GC, Pectinase (hemicellulase)", "Spezyme CP", and "GC220" (manufactured by Genencor). The amount of addition is not limited, but is preferably 0.5 to 2.0 kg / t.

[0051] The dry tensile strength of the toilet paper according to this embodiment is not limited, but the dry tensile strength in the machine direction is preferably 400 cN / 25 mm to 600 cN / 25 mm, and more preferably 450 cN / 25 mm to 580 cN / 25 mm, and the dry tensile strength in the cross direction is preferably 100 cN / 25 mm to 200 cN / 25 mm, and more preferably 135 cN / 25 mm to 180 cN / 25 mm. Here, the machine direction of the paper is also called the MD direction, and is the direction of flow during papermaking. The cross direction of the paper is also called the CD direction, and is the direction perpendicular to the machine direction (MD) during papermaking. The dry tensile strength according to this embodiment is a value measured based on JIS P 8113 (2006) and is measured as follows. Test specimens are used that are cut to a width of approximately 25 mm (±0.5 mm) x length of approximately 150 mm in both the machine and cross directions. The test specimens are measured as multi-ply. The testing machine used is a Minebea Co., Ltd. load cell tensile testing machine TG-200N or an equivalent machine. The grip interval is set to 100 mm and the tensile speed is 100 mm / min. Measurements are performed by clamping both ends of the test piece into the grips of the testing machine, applying a tensile load to the paper piece in the vertical direction, and reading the indicated value (digital value) when the paper breaks. Five sets of samples are prepared in both the vertical and horizontal directions, and measurements are taken five times each, with the average of these measurements being taken as the dry tensile strength in each direction.

[0052] Furthermore, the wet tensile strength of the toilet paper according to this embodiment in the longitudinal direction is 20 cN / 25 mm or more and 60 cN / 25 mm or less, preferably 30 cN / 25 mm or more and 55 cN / 25 mm or less, and the wet tensile strength in the transverse direction is desirably 10 cN / 25 mm or more and 30 cN / 25 mm or less. The wet tensile strength is a value measured based on JIS P 8135 (1998) and is measured as follows. Test pieces are cut to approximately 25 mm (±0.5 mm) wide x 150 mm long in both the longitudinal and transverse directions. Multi-ply toilet paper is measured as multi-ply. The test machine used is a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. or an equivalent machine. The grip spacing is set to 100 mm, and the tensile speed is set to 50 mm / min. The test pieces are cured in a dryer at 105°C for 10 minutes. After clamping both ends of the test piece in the grips of the testing machine, water is applied horizontally to the center of the test piece in a width of about 10 mm using a water-soaked flat brush, and then a tensile load is immediately applied to the paper in the vertical direction, and the reading (digital value) is read when the paper breaks. Five sets of samples are prepared in both the vertical and horizontal directions, and measurements are taken five times each, with the average of these measurements being the wet tensile strength in each direction.

[0053] On the other hand, the toilet paper according to this embodiment preferably has a water-disintegrability of 60 seconds or less, preferably 20 seconds or more and 45 seconds or less. If the water-disintegrability is 60 seconds or less, there is little risk of clogging pipes when the paper is disposed of in a flush toilet or the like. Furthermore, if the water-disintegrability is 20 seconds or more, there is little risk of the fibers immediately unraveling and breaking when wiping off a large amount of water after using a shower toilet. This water-disintegrability (ease of unraveling) is measured in accordance with JIS P 4501 (1993). To test for ease of unraveling, a 300 mL beaker containing 300 mL of water (water temperature 20±5°C) is placed on a magnetic stirrer, and the rotor rotation speed is adjusted to 600±10 rpm. A test piece with sides measuring 100±2 mm is placed in the beaker, and a stopwatch is started. The rotor rotation speed initially drops to approximately 500 rpm due to the resistance of the test piece, and then increases as the test piece unravels. The stopwatch is stopped when the number of revolutions has recovered to 540 revolutions, and the time is measured in 1-second increments. The test is carried out five times and the result of the ease of unraveling is expressed as the average. The rotor is a disk with a diameter of 35 mm and a thickness of 12 mm.

[0054] On the other hand, it is desirable that the number of sheets of toilet paper permeated in this embodiment is 9 or more. To measure the number of sheets permeated, multiple sheets of toilet paper are stacked under their own weight, and 100 μL of water is dripped from 10 mm above the topmost sheet of toilet paper. After the dripping, the penetration into the bottom layer is immediately confirmed. Starting with a small number of layers, the number of layers is increased until penetration is no longer confirmed, and the maximum number of sheets at which penetration can be confirmed is measured. If the number exceeds 9 sheets, it can be said that water permeates extremely quickly.

[0055] Furthermore, the toilet paper according to this embodiment preferably has perforations arranged at predetermined intervals along the length. The perforation interval is not limited, but can be 100 to 120 mm. The perforation strength is preferably 580 to 700 cN / 114 mm. The perforation strength is measured in accordance with the dry tensile strength measurement method based on JIS P 8113 (2006). The measurement sample is 200 mm long and the full width of the toilet paper product, with the perforations centered along the length. The measurement is performed by folding the sample in half or quarters along the length (corresponding to the MD axis) to a width that can be clamped by the chuck of the tensile tester, with a grip distance of 100 mm and a tensile speed of 100 mm / min. This measurement is performed five times, converted to a width of 114 mm, and the average value is taken as the perforation strength.

[0056] The tester may be a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. or an equivalent machine. [Example]

[0057] Furthermore, for the examples and comparative examples of toilet rolls according to the present invention, physical properties such as water disintegrability and number of sheets permeated, as well as composition, were measured. Furthermore, a sensory evaluation test was conducted on the following items: "firmness of the roll (hardness of the roll)," "touch of the roll surface," "daily roll replacement frequency," "thickness of the toilet paper (feeling of security during use)," "softness of the toilet paper," "fluffiness of the toilet paper," "smoothness of the toilet paper," and "wiping feel of the toilet paper." This sensory evaluation test involved 20 subjects actually using the toilet rolls and evaluating each item. The evaluation also used Comparative Example 1, a conventional 2-ply product, as the reference sample. The evaluation was conducted on a 7-point scale, with the reference sample receiving 4 points, and compared against each other, with particularly good being 7 points, good being 6 points, somewhat good being 5 points, and somewhat poor being 3 points. Scoring was then performed with 2 points being poor and 1 point being particularly poor, and the average score was calculated. Regarding the "firmness of the roll (hardness of the roll)," samples that were harder than the reference sample were given a higher score, and samples that were softer were given a lower score.

[0058] In the examples and comparative examples, toilet paper was used that was made into two plies by laminating a first sheet and a second sheet, each having a first recess and a second recess on the same surface, with the surfaces with the first recess and the second recess facing outward. The second sheet had recesses formed therein that were the same in shape and depth as the second recesses on the first sheet. The shapes of the first recess and the second recess in Examples 1 to 7, Comparative Example 1, and Comparative Examples 4 to 7 were the same, and the shapes of the first recess and the second recess in Comparative Example 2 and Comparative Example 3 were the same. A paper strength agent was used in each example. In Examples 1 to 7 and Comparative Examples 4 to 7, an enzyme-based paper strength agent (Hercobond 8922, manufactured by Riken Green Co., Ltd.) was used as the dry paper strength agent. Also, a temporary paper strength agent (TS4070, manufactured by Seiko PMC Co., Ltd.) was used. In Comparative Example 1, a cationized starch (DD4280, manufactured by Seiko PMC Co., Ltd.) was used as the dry paper strength agent. Also, a temporary paper strength agent (TS4070, manufactured by Seiko PMC Co., Ltd.) was used. Other physical properties and compositions of the examples and comparative examples are shown in the following Table 1. The measurement methods are as described above.

[0059] [Table 1]

[0060] As the results shown in Table 1 show, the "firmness of the roll (hardness of the roll)" tends to increase as the winding length increases. The examples according to the present invention have a longer winding length than Comparative Examples 1 to 3, and are evaluated as being firm and hard. However, despite this, the feel of the roll surface is rated higher than Comparative Examples 1 to 3.

[0061] Furthermore, in all categories related to the texture of the toilet paper, including "thickness of the toilet paper (sense of security when using)," "softness of the toilet paper," "fluffiness of the toilet paper," "smoothness of the toilet paper," and "wiping feel of the toilet paper," the results were superior to those of Comparative Examples 1 to 3, which were wound short and loosely.

[0062] Furthermore, looking at Comparative Examples 4 to 7, it can be seen that the evaluations tend to be slightly lower than those of Examples 1 to 7 according to the present invention.

[0063] In other words, the examples of the present invention provide toilet paper that is excellent in wiping moisture off skin, has high absorbency, and provides a sense of security when wiping, and also has a sufficient texture that is soft, fluffy, and smooth.Furthermore, the roll is firm yet has an excellent feel to the touch on the roll surface.

[0064] The following aspects can also be proposed. A toilet roll in which two sheets of toilet paper are adhered together via embossed recesses and wound around a paper tube. The winding diameter is 120 mm or less, and the winding length is 34.5 to 50 m, The toilet paper has a basis weight per ply of 13.5 to 16.0 g / m2 and a thickness of 180 to 225 μm for two plies, The toilet paper, a first sheet having a first recess and a second recess formed by embossing and having different depths, and a second sheet; The first recess has a diameter of 1.00 to 22.0 mm. 2 and a depth of 0.17 to 0.23 mm. The second recess has a diameter of 0.25 to 0.75 mm. 2 and a depth of 0.050 to 0.090 mm. The embossing density of the first recesses is 4 to 14 / cm 2 The embossing density of the second recesses is 2 to 11 / cm 2 and The first recess has an inner surface of the laminate bonded to the second sheet, and the inner surface of the second recess is not bonded to the second sheet; The toilet paper is wound around the paper tube with the first sheet facing outward. This is an embodiment of the toilet roll characterized by the above. [Explanation of symbols]

[0065] 1...toilet roll, 10...toilet paper, 20...paper tube (core), L1...toilet roll roll diameter, L3...toilet roll core diameter, L2...toilet roll width.

Claims

1. A toilet roll in which two sheets of toilet paper are adhered together via embossed recesses and wound around a paper tube, The winding diameter is 120 mm or less, and the winding length is 34.5 to 50 m, The toilet paper has a basis weight per ply of 13.5 to 16.0 g / m2 and a thickness of 180 to 225 μm for two plies, The toilet paper, a first sheet having a first recess and a second recess formed by embossing and having different depths, and a second sheet; The first recess has a length of 1.00 to 22.0 mm ２ and a depth of 0.17 to 0.23 mm; The second recess is 0.25 to 0.75 mm ２ and a depth of 0.050 to 0.090 mm; The embossing density of the first recesses is 4 to 14 / cm ２ The embossing density of the second recesses is 2 to 11 / cm ２ and The first recess has an inner surface of the laminate bonded to the second sheet, and the inner surface of the second recess is not bonded to the second sheet; The toilet paper is wound around the paper tube with the first sheet facing outward. A toilet roll characterized by:

2. 2. The toilet roll according to claim 1, wherein the second sheet has recesses formed by embossing, the recesses being shallower in depth than the first recesses formed in the first sheet.

3. Roll winding density is 0.74 to 1.30 m / cm ２ and the roll density is 0.12 to 0.18 g / cm ３ The toilet roll according to claim 1 or 2,

4. The toilet roll according to any one of claims 1 to 3, wherein the roll compression degree is 0.66 to 1.

50.

5. The toilet roll according to any one of claims 1 to 4, wherein the toilet paper is treated with an enzyme-based paper strength agent.

6. The toilet roll according to any one of claims 1 to 5, wherein the toilet paper does not contain starch and cationic starch.

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