Toilet roll

Abstract

To provide a toilet roll that achieves both quality in terms of tactile feel such as softness and fluffiness, and functionality such as firmness and absorbency required for use with a shower toilet.SOLUTION: A toilet roll in which toilet paper is wound around a paper core with a roll length of 20 to 40 m and a roll diameter of 110 to 130 mm. The toilet paper is subjected to laminated embossing and has the dry tensile strength in the vertical direction of 250 cN / 25 mm to 360 cN / 25 mm, the dry tensile strength in the lateral direction of 65 cN / 25 mm to 120 cN / 25 mm, the vertical / lateral ratio of 2.9 to 3.8, the wet tensile strength in the vertical direction of 40 cN / 25 mm to 80 cN / 25 mm, the wet tensile strength in the lateral direction of 16 cN / 25 mm to 35 cN / 25 mm, and the ratio of the wet tensile strength in the lateral direction to the dry tensile strength in the lateral direction of 0.20 to 0.40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] As consumer preferences diversify, toilet rolls are being developed to suit a variety of preferences. For example, there are products called standard or regular products, which are two-ply toilet paper rolls with a length of about 25-30 m, products called long products with a length of about 75-90 m, which is three times longer than regular products, and products called shower toilet products, which are rolls with toilet paper with the same length as regular products but with increased wet strength and water absorbency.

[0003] Regular products are the traditional long roll products, and compared to long products, they have a relatively high basis weight and thickness, but in recent years have become a high-quality product group and are preferred by consumers who prioritize quality such as skin damage and softness and fluffiness. Long products are also preferred by consumers who value the benefit of fewer purchases and replacements. Shower toilet wipes are preferred by consumers who value functionality such as ease of wiping and a sense of security when wiping away feces and urine along with the moisture that has adhered to the skin after washing the defecation and urination areas with warm or cold water in a shower toilet.

[0004] Products for shower toilets have improved wet strength, sheet thickness, strength, and the ability to maintain gaps between plies by using, for example, temporary wet strength agents such as wet strength agents or cationic aldehyde-modified polyacrylamide copolymers, or by using laminate embossing technology in which embossed plies are laminated and bonded together with adhesive. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 08-56868 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-320688 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-153387 Summary of the Invention [Problem to be solved by the invention]

[0006] However, products for shower toilets are inferior to standard products in terms of quality, such as softness and fluffiness, and water-dissolvability, because the stiffness of the paper is increased to create a firm feel, they tend to feel crunchy due to adhesives, and they have poor water-dissolvability due to high levels of wet strength agents, etc. These can be dissatisfaction points for consumers who prefer shower toilets.

[0007] On the other hand, as flushing toilets have become more widespread and familiar, the applicant's research has revealed that some consumers who used regular toilets because they placed importance on quality such as softness and fluffiness feel that the absorbency and firmness of the paper are insufficient when used in flushing toilets.

[0008] Therefore, the main object of the present invention is to provide a toilet roll that combines quality aspects related to the feel of a normal product, such as softness and fluffiness, with functionality such as firmness and absorbency of a paper roll for a shower toilet, and that is unlikely to cause dissatisfaction whether used normally or in a toilet with a flushing function. [Means for solving the problem]

[0009] The first means for solving the above problem is: A toilet roll in which two sheets of two-ply toilet paper are laminated together and wound around a paper tube with a roll length of 20 to 40 m and a roll diameter of 110 to 130 mm, The toilet paper is Sheets having recesses on one side and protrusions on the other side corresponding to the recesses by embossing are laminated together so that the surfaces on which the protrusions are formed face each other, and the tops of the protrusions are bonded together with adhesive, The dry tensile strength in the longitudinal direction is 250 cN / 25 mm or more and 360 cN / 25 mm or less, and the dry tensile strength in the transverse direction is 65 cN / 25 mm or more and 120 cN / 25 mm or less, The ratio of the dry tensile strength in the longitudinal direction to the dry tensile strength in the transverse direction (dry tensile strength in the longitudinal direction / dry tensile strength in the transverse direction) is 2.9 or more and 3.8 or less, The wet tensile strength in the longitudinal direction is 40 cN / 25 mm or more and 80 cN / 25 mm or less, and the wet tensile strength in the transverse direction is 16 cN / 25 mm or more and 35 cN / 25 mm or less, and the ratio of the wet tensile strength in the transverse direction to the dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction) is 0.20 to 0.40; The toilet roll is characterized by the above.

[0010] The second method is In the toilet roll according to the first aspect, the ratio of the wet tensile strength in the machine direction to the dry tensile strength in the machine direction (wet tensile strength in the machine direction / dry tensile strength in the machine direction) is 0.10 to 0.25.

[0011] Other means include: Four sheets of toilet paper were stacked on top of each other, and the test probe was pressed into the test piece using a compression tester. The test result was 0.5 gf / cm 2 Load T0 to 50gf / cm 2 The toilet roll according to the first or second aspect above, wherein the stretchability, which is the amount of displacement (T0-Tm) up to Tm under load, is 1.0 mm or more.

[0012] Another option is to The toilet roll according to the first, second and other means is a nested laminated structure in which the raised portions of one sheet are positioned in a portion of the other sheet other than the raised portions, and the two sheets are adhered together by adhesive applied to the raised portions of the sheet located on the outer surface of the roll. [Effects of the Invention]

[0013] According to the present invention, a toilet roll is provided which combines quality aspects relating to the feel of the toilet, such as softness and fluffiness like regular products, with functionality such as firmness and water absorbency like that of a toilet for shower use, and is unlikely to cause dissatisfaction whether used in a toilet with a flushing function or in a regular use. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a toilet roll according to an embodiment of the present invention. FIG. [Figure 2] 1 is a schematic cross-sectional view of toilet paper according to an embodiment of the present invention. [Figure 3] FIG. 1 is a diagram showing an example of a plan view of toilet paper according to an embodiment of the present invention. [Figure 4] FIG. 1 is a schematic diagram illustrating a method for measuring sheet stretchability according to the present invention. [Figure 5] 1 is a schematic diagram illustrating a method for measuring MMD according to the present invention. [Figure 6] FIG. 1 is a schematic diagram for explaining a method for measuring roll tightness according to the present invention. [Figure 7] FIG. 2 is a schematic diagram for explaining the procedure for measuring roll hardness according to the present invention. [Figure 8] FIG. 2 is a schematic diagram for explaining the procedure for measuring roll softness according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Next, embodiments of the present invention will be described in detail below with reference to the drawings.

[0016] As shown in Figure 1, the toilet roll according to this embodiment is a cylindrical shape in which two-ply water-decomposable toilet paper 10, consisting of a first sheet 11 and a second sheet 12 laminated together, is wound around a paper tube (also called a tube core) 20. In the toilet roll 1 of this embodiment, the toilet paper is wound with the first sheet 11 on the outer surface and the second sheet 12 on the inner surface.

[0017] In the case of toilet rolls, the roll length of a product group called a 2-ply standard product is about 25 to 30 m, but the roll length of the toilet roll 1 according to this embodiment is 20 to 40 m, preferably 20 to 30 m, which is the same as that of a product group called a standard product.

[0018] 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 or less, and can be set in a standard holder. Furthermore, if the roll length is less than 110 mm, the toilet paper will be tightly wound, which will likely result in a deterioration in quality aspects such as feel to the touch. 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 34 to 42 mm.

[0019] The toilet paper 10 wound around the toilet roll 1 according to this embodiment is a two-ply toilet paper 10 made up of two laminated sheets (a first sheet 11 and a second sheet 12) each having embossed recesses 32 and protrusions 31. The basis weight of each sheet 11, 12, i.e., the basis weight per ply, is 15.5 to 20.0 g / m 2, preferably 17.0 to 19.0 g / m2. If the basis weight of each sheet 11, 12 is within this range, it is possible to ensure a sufficient softness and fluffy feel to the touch. It is also possible to ensure sufficient wiping ability and absorbency for moist skin, as well as a sense of security when wiping. In particular, it is possible to provide a toilet roll 1 that is equal to or better than the conventional products known as regular products, and that has the same wiping ability and absorbency for moist skin, as well as a sense of security when wiping, as well as the same as the conventional products known as for shower toilets, making it unlikely for consumers to be dissatisfied with its quality and functionality.

[0020] The thickness of the toilet paper 10, i.e., the thickness of two plies, is 200 to 300 μm, more preferably 230 to 290 μm. If the paper thickness is within this range, the toilet roll 1 can be made to be of quality and functionality that is unlikely to cause consumer dissatisfaction. The basis weight can be adjusted by, for example, the fiber basis weight and crepe rate, and the paper thickness can be adjusted by, for example, whether or not calendering is performed, the calender pressure, the embossing process, the crepe rate, etc.

[0021] The basis weight (US basis weight) is measured in accordance with JIS P 8124. Paper thickness is measured by conditioning the test specimen thoroughly (usually for about 8 hours) under the conditions specified in JIS P 8111 (1998), then measuring 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 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.

[0022] On the other hand, the disintegrated freeness of the toilet paper according to this embodiment is preferably 500cc or more and 650cc or less, more preferably 500cc or more and 620cc or less, and particularly preferably 500cc or more and 590cc or less. The disintegrated freeness can be adjusted by the degree of beating of the pulp fibers. In other words, the lower the value of disintegrated freeness, the more the pulp fibers are beaten, and the higher the value, the less the pulp fibers are beaten. This disintegrated freeness range is slightly higher than that of toilet paper in the general standard product group. By setting the degree of beating of the pulp fibers to a low degree and setting the disintegrated freeness within the above range, and by adopting other configurations according to the present invention, it becomes particularly easy to achieve both quality equivalent to standard products and functionality equivalent to those for shower toilets.

[0023] The disintegrated freeness is measured by disintegrating toilet paper using a standard disintegrator in accordance with JIS P 8220-1 and JIS P 8220-2:2012 (Pulp disintegration method), and the resulting slurry is measured using the Canadian standard freeness method of JIS P 8121-2:2012 (Testing method for freeness of pulp). More specifically, the disintegrated freeness is measured as follows. In the following measurement, measurements are taken twice for the same sample, and the measured value is the average value. If the two measured values ​​differ from the average value by 2% or more, an additional test is conducted.

[0024] (Toilet paper defibration) Tear a sheet (toilet paper) by hand into approximately 2cm pieces to prepare a sample of 30±0.5g in bone-dry condition. Immerse 30±0.5g of the torn sheet in 2000mL of water (concentration 1.5% by mass) for at least 4 hours. The water temperature during this process should be 20±5°C. After 4 hours or more, place 30±0.5g of the sheet and 2000mL of water into a standard disintegrator. After checking the water temperature, disintegrate for 10 minutes. After 10 minutes, take a teaspoonful or so into a measuring cylinder, dilute it with water, and visually check whether the fibers have been defibrated. If sufficient defibration is confirmed, perform the freeness measurement described below on the defibrated liquid. If defibration is insufficient, defibrate again. At this time, check visually as above every 2-3 minutes to see if the fibers have been defibrated, and repeat the procedure until defibration is complete. However, the maximum time is 30 minutes. In this way, defibration can be achieved without significantly changing the original properties of the fibers. The defibration count of a standard defibrator, 1230 rpm, is the count value when the defibrator is operated for 10 minutes.

[0025] (Freeness measurement) The following Canadian Standard Freeness Tester shall be used to measure in accordance with the Canadian Standard Freeness Test (JIS P 8121-2 2012) as follows: The Canadian Standard Freeness Tester shall be one of the following specifications or an equivalent. The filter bottle is a cylinder, for example, made of bronze, with a sieve plate (a circular plate with 97 0.5 mm diameter holes per cm2) set at its bottom. The hole diameter of the stopcock for air intake is 4.8 mm. The measuring funnel is, for example, made of brass, with a diameter of 203 mm at the open top and a total length of 278 mm, and the apex angle of the main cone is machined to 29.5 ± 0.5°. The funnel also has a precisely machined bottom hole at its bottom and a side tube attached to its side. The minimum diameter of the bottom hole is 3.1 mm, and it is adjusted so that when 725 ± 5 mL of water (at 20 ± 5°C) is supplied to the funnel per minute, 530 ± 5.3 mL of water is discharged per minute. The side tube is a hollow tube with an inner diameter of 12.7 mm that penetrates the wall of the funnel. The volume of water between the bottom of the funnel and the overflow level is 23.5 ± 0.2 mL.

[0026] Next, a measurement liquid having a solids concentration of 0.3% by mass is prepared from the macerated liquid obtained in the above "(Disintegration of toilet paper)" as follows. First, the disintegrated liquid obtained in the above "(Disintegration of toilet paper)" is diluted to a concentration of 0.3 to 1.0% by mass. Approximately 500 g of the diluted sample is taken, placed in a weighing container, and weighed to within 0.5 g (weighed value A). Next, place the No. 2 filter paper in a hot air dryer (105±2°C), dry it to a constant weight, and weigh it to an accuracy of 0.01 g (weighed value B). The No. 2 filter paper is placed in a Buchner funnel, wetted with water, and suction is initiated. Next, approximately 500 g of the collected sample is transferred to the Buchner funnel and the moisture is sucked out. After suction is complete, the No. 2 filter paper with the fibers on it is removed and passed through a sheet dryer set at 120°C twice, then dried in a hot air dryer. (105±2℃) for 10 minutes, then remove. Weigh the mass of the No. 2 filter paper with the removed fibers to an accuracy of 0.01 g (weighed value C).

[0027] After determining the weighed values ​​A to C as described above, calculate the solid content concentration X (mass %) of the sample using the following formula (rounding width: 0.01). Solid concentration X = (((weighed value C) - (weighed value B)) / (weighed value A)) x 100 Based on the calculated solid content X (mass%), the amount D of diluted macerating liquid to be collected is determined using the following formula so that 3 g of bone-dry pulp is contained. Collection amount D(g)=300÷X Disintegration solution D (g) containing 3 g of bone-dry pulp is placed in a 1000 mL measuring cylinder and diluted to 1000 mL to prepare a measurement solution with a solids concentration of 0.3 mass%. The temperature at this time is measured with an accuracy of 1°C.

[0028] Next, measure the adjusted test liquid using the Canadian Standard Freeness Tester described above. Before pouring the test liquid into the tester, cover the opening of the measuring cylinder with your palm and stir by turning it upside down three times. After pouring the test liquid into the tester, allow the free water to flow down after five seconds. Once drainage from the side pipe has stopped, weigh the amount of water drained from the side pipe to an accuracy of 0.1 g and convert the mass to volume (mL). Next, correct the measured value to the freeness at a standard temperature of 20°C using the "Freeness Correction Table for a Temperature of 20°C" in Appendix D of JIS P 8121-2 2012 and the water temperature of the measurement liquid. The average value corrected to a temperature of 20°C is taken as the maceration freeness. The accuracy is 1 mL. If the concentration is not exactly 0.3% by mass, correct the concentration using the "Freeness Correction Table for a Concentration of 0.30%" in Appendix C of JIS P 8121-2 2012.

[0029] On the other hand, the fibers constituting the toilet paper according to this embodiment are not necessarily limited, but it is preferable that 60% to 85% by mass of the fibers constituting the toilet paper are hardwood-derived pulp. It is particularly preferable that 65% to 80% by mass of the fibers are hardwood-derived pulp. Hardwood-derived pulp has short fiber length, which makes it easy to improve the texture of the paper surface. On the other hand, hardwood-derived pulp is less likely to lose its absorbency and firmness due to its short fiber length. However, the toilet paper according to this embodiment is sufficiently firm and absorbent by low beating so that the disintegration freeness is slightly higher. Known hardwood-derived pulp includes LBKP (hardwood kraft pulp), LUKP, and LOKP, but bleached LBKP is preferable. As for fibers other than hardwood-derived pulp, softwood-derived pulp is preferable. In this case, chlorine-bleached softwood kraft pulp (NBKP) is preferable.

[0030] Here, the tensile strength of the toilet paper according to this embodiment is a dry tensile strength in the machine direction of 250 cN / 25 mm or more and 360 cN / 25 mm or less, and a dry tensile strength in the cross direction of 65 cN / 25 mm or more and 120 cN / 25 mm or less. The dry tensile strengths of the present invention in both the machine direction and the cross direction are in a low range for a nested type of lamination technology. In particular, the dry tensile strength in the cross direction is in a range that can be said to be equivalent to or lower than that of a regular product that does not use lamination technology. The low dry tensile strength in the machine direction improves the smoothness of the feel, and the low dry tensile strength in the cross direction improves softness. Furthermore, the wet tensile strength in the machine direction is 40 cN / 25 mm or more and 80 cN / 25 mm or less, and the wet tensile strength in the cross direction is 16 cN / 25 mm or more and 35 cN / 25 mm or less. The wet tensile strength in the cross direction is slightly higher than that of products that do not use lamination technology. This range can be achieved by adjusting the J / W ratio and sizing during base paper production.

[0031] Furthermore, the ratio of the dry tensile strength in the machine direction to the dry tensile strength in the cross direction of the toilet paper according to this embodiment (dry tensile strength in the machine direction / dry tensile strength in the cross direction) is 2.9 or more and 3.8 or less. Preferably, it is 3.0 or more and 3.7 or less. Here, the machine direction 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 direction of flow (MD) during papermaking. The aspect ratio of the toilet paper according to this embodiment is higher than that of regular products and is closer to that of products for shower toilets. This aspect ratio can be adjusted by the J / W ratio during base paper production. It is expected that this aspect ratio will improve the stretchability of the sheet, particularly as described below.

[0032] In addition, the toilet paper according to this embodiment has a ratio of wet tensile strength in the transverse direction to dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction) of 0.20 to 0.40. Preferably, it is 0.21 to 0.35. The tensile strength of toilet paper is generally lower in the transverse direction than in the longitudinal direction, and the inventors have found that this difference in low tensile strength in the transverse direction between dry and wet states can affect how people feel when wiping away moisture. In other words, a smaller difference in tensile strength in the transverse direction between dry and wet states makes it easier to obtain a sense of firmness and security when wiping away moisture. For this reason, for example, when used in a toilet with a flushing function, this can affect the sense of security when wiping away moisture that has adhered to the skin during flushing. Preferably, the ratio of wet tensile strength in the longitudinal direction to dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction) is 0.10 to 0.25. These values ​​are equivalent to those of conventional regular products and products for shower toilets, and the longitudinal strength is reduced as usual, with little impact on the firmness and sense of security that are thought to be due to the ratio of the wet tensile strength in the transverse direction to the dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction). In the toilet paper of this embodiment, the ratio of the wet tensile strength in the transverse direction to the dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction) and the ratio of the wet tensile strength in the longitudinal direction to the dry tensile strength in the longitudinal direction (wet tensile strength in the longitudinal direction / dry tensile strength in the longitudinal direction) can be adjusted by the J / W ratio during base paper production. However, in this case, the longitudinal tensile strength is adjusted to be slightly higher and the transverse tensile strength to be slightly lower. By adjusting this, in combination with the range of disintegration freeness, and further with the laminate embossing process described below, the ratio of the wet tensile strength in the transverse direction to the dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction) can be suitably adjusted within the above range.

[0033] Dry tensile strength is measured in accordance with JIS P 8113 (2006) 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 test equipment used is a Minebea Co., Ltd. load cell tensile tester TG-200N or 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, and reading the digital value when the paper breaks. Five sets of specimens are prepared in both the longitudinal and transverse directions, and measurements are taken five times. The average of these measurements is the dry tensile strength in each direction.

[0034] Wet tensile strength is measured in accordance with JIS P 8135 (1998) 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. For multi-ply toilet paper, the test is performed on the multi-ply paper as is. The test equipment used is a Minebea Co., Ltd. load cell tensile tester TG-200N or an equivalent. The grip spacing is set to 100 mm, and the tensile speed is set to 50 mm / min. Test specimens are cured for 10 minutes in a dryer at 105°C. After clamping both ends of the specimen into the grips of the tester, a water-soaked flat brush is used to horizontally apply water to the center of the specimen in a width of approximately 10 mm. A tensile load is then immediately applied vertically to the paper specimen, and the digital reading is read when the paper breaks. Five sets of samples are prepared in each of the machine and cross directions, and measurements are taken five times in each direction. The average of the measurements is taken as the wet tensile strength in each direction.

[0035] On the other hand, the toilet paper according to this embodiment may contain known dry strength agents, dry strength agents, and temporary wet strength agents. However, 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. The toilet paper according to this embodiment can be a toilet roll with sufficient quality and functionality without using a strength agent, based on the essential components of the present invention, such as maceration freeness, tensile strength, and laminate embossing, and the technical common sense of a person skilled in the art.

[0036] In addition, the toilet paper 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.

[0037] On the other hand, the toilet paper of this embodiment has the above-mentioned paper quality, and as a mechanical structure, as shown in Figures 2 and 3, in particular, each of the first sheet 11 and second sheet 12 constituting the toilet paper 10 is embossed to form recesses 32 on one side and protrusions 31 corresponding to the recesses 32 on the other side, and in particular, these sheets are stacked so that the surfaces on which the protrusions are formed face each other, and are bonded together by adhesive at the tops of the protrusions 31. Therefore, the toilet paper according to this embodiment has a configuration in which only the recesses 32 are present on the front and back surfaces.

[0038] The planar shape of each recess 32 is not limited. In addition, all recesses 32 do not need to have the same shape. A suitable shape of the recess 32 is a shape without corners from the viewpoint of softness and other touches, and specifically, a circle, an ellipse, a rounded triangle, a rounded rectangle, or a rounded polygon is preferable. A circle or an ellipse is particularly preferable. The area of ​​the recess 32 is 0.5 to 8 mm 2 is preferable, and 1.0 to 3.2 mm 2 is particularly preferred.

[0039] The embossed area ratio (total area of ​​recesses / total area of ​​sheet) in the toilet paper 10 of this embodiment is not necessarily limited, but is preferably 15 to 28%. On each side of the first sheet and the second sheet, it is preferably 8 to 14%. Here, the embossed area ratio in the toilet paper of this embodiment is a value measured on a sample taken from 30 cm from the end of the roll, excluding the tail seal portion.

[0040] The arrangement (embossing pattern) of the recesses 32 in the toilet paper 10 of this embodiment is not limited. As one form, an arrangement in which the recesses 32 are appropriately arranged to form an appropriate geometric pattern such as a floral pattern or a heart pattern as a whole, as shown in Figure 3, is desirable from the standpoint of design.

[0041] The stacking configuration of the first sheet 11 and the second sheet 12 in the toilet paper 10 of this embodiment can be a so-called tip-to-tip configuration in which the raised portions of the first sheet face the raised portions of the second sheet, or a so-called nested configuration in which the raised portions 31 of the first sheet 11 face the portions of the second sheet 12 other than the raised portions 31, as shown in FIG. 2, and the raised portions 31 of the second sheet 12 face the portions of the first sheet 11 other than the raised portions 31. The nested configuration is particularly preferred. The nested configuration is more likely to produce soft toilet paper because the positions of the recesses on the front and back are different. In addition, the number of columnar raised portions 31 between the sheets is increased, making it difficult for the gaps between the sheets to collapse, and making it easier to achieve sufficient wiping performance, absorbency, and a sense of security when wiping. Furthermore, the thickness can be thinner than the tip-to-tip configuration. For this reason, in a rolled form such as toilet rolls, where a specified length needs to be contained within a specified roll diameter, each sheet can be made to have a higher basis weight and lower density than tip-to-tip toilet paper, and can be wound up somewhat looser, so the unevenness caused by the embossing is less likely to be crushed, making it particularly excellent in terms of both quality and functionality.

[0042] Furthermore, the first sheet 11 and the second sheet 12 in the toilet paper 10 of this embodiment may be bonded at all of the raised portions 31, but are not necessarily bonded at all of the raised portions 31. In one preferred embodiment, no adhesive is applied to the raised portions 31 of the second sheet 12 located on the inner winding surface of the roll, and the first sheet 11 and the second sheet 12 are bonded together by adhesive applied to all or some of the raised portions 31 of the first sheet 11 located on the outer winding surface of the roll. Because there are no adhesive portions near the outer winding surface of the roll, a toilet roll of this embodiment tends to feel soft, especially when held in the hand.

[0043] Furthermore, the adhesive area ratio (total area of ​​adhesive portions / total area of ​​sheet) in the toilet paper 10 of this embodiment is not necessarily limited, but is preferably 20% or less. The lower limit is preferably 9%. If the adhesive area ratio is 20% or less, the hard texture of the toilet paper, particularly that achieved by laminate embossing technology, becomes less noticeable. The adhesive area ratio in the toilet paper of this embodiment is a value measured using a sample taken from 30 cm from the end of the roll, excluding the tail seal portion.

[0044] The type of adhesive used in the toilet paper of this embodiment is not necessarily limited. Preferred adhesives are water-soluble adhesives such as PVA (polyvinyl alcohol) and CMC (carboxymethyl cellulose), and CMC, which is a cellulose-based water-soluble adhesive, is particularly preferred.

[0045] Here, in the configuration of the toilet paper according to this embodiment, when four sheets are stacked and the measuring terminal is pressed into the sheet using a compression tester, the compressibility is 0.5 gf / cm 2 Load T0 to 50gf / cm 2 The stretchability, which is the displacement (T0-Tm) up to Tm under load, can be set to 1.0 mm or more. Therefore, it is preferable that the toilet paper of this embodiment has a stretchability of 1.0 mm or more. The stretchability can be measured using a KES-G5 (manufactured by Kato Tech Co., Ltd.) or an equivalent device. The measurement terminal is the standard 2 cm terminal attached to the KES-G5. 2 Or equivalent measuring terminal (circular, flat measuring surface, area 2cm 2 More specifically, as shown in FIG. 4, four sheets of toilet paper 10 are placed on the measurement table of the compression tester or on a hard horizontal table 40, and the measurement surface is placed on the toilet paper to a depth of 2 cm. 2 The flat measuring probe is pressed against the surface at a speed of 0.02 mm / sec. 2 The indentation position T0 under load and 50gf / cm 2The indentation position Tm when the load is applied is measured, and the difference is taken as the stretchability value. The sample is the paper width (roll width) x 100 mm. Stretchability particularly affects quality aspects such as softness and fluffiness in the thickness direction. For shower toilet products, emphasis is placed on ensuring gaps between sheets using laminate embossing technology, so stretchability is generally around 0.5 to 0.7 mm. Stretchability exceeding 1.0 mm is equivalent to or better than that of standard products. As described above, the toilet paper configuration of the present invention can achieve a stretchability of 1.0 mm or more. This stretchability value is particularly easy to achieve by adjusting at least one of the embossing-related configurations, such as the lamination form, embossed area ratio, adhesive area ratio, and adhesive type, within the above range. Furthermore, to measure the stretchability of the toilet paper of this embodiment, a sample is taken from a position 1 to 15% from the end of the toilet roll. If the stretchability at this position is within the above range, the unevenness caused by the embossing will not be crushed, and the quality will be fully satisfactory.

[0046] In addition, the toilet paper according to this embodiment is attached standard terminal 2 cm 2 The compression characteristic LC value, which can be measured simultaneously with or separately from the above-mentioned stretchability using a machine such as the KES-G5 (manufactured by Kato Tech Co., Ltd.) or its equivalent, is preferably in the range of 0.35 to 0.70, the compression energy WC value is preferably in the range of 1.25 to 1.75, and the recoverability RC value is preferably in the range of 40 to 50. These values ​​are equivalent to or greater than those of standard products and shower toilet products. The closer the compression characteristic LC value to 1.0, the harder the product is evaluated to be when compressed. The larger the compression energy WC value, the easier it is evaluated to be compressed. The closer the recoverability RC value to 100, the better the recoverability.

[0047] On the other hand, the toilet paper according to this embodiment preferably has an HF (hand feel) value of 94 or more, as measured by a tissue softness measuring device (TSA). The toilet paper configuration of this embodiment allows for an HF (hand feel) value of 94 or more. An HF (hand feel) value of 94 or more is a high value that is equal to or higher than that of standard product groups. The HF (hand feel) value is measured on the outer surface of the roll. The measurement sample is taken from a position 1 to 15% from the end of the toilet roll.

[0048] The TSA tissue softness measuring device is a TSA tissue softness measuring device manufactured by Emtec Electronic GmbH (Japan distributor: Nippon Luft Co., Ltd.) in Germany, and its equivalents. The feel of toilet paper in use is affected by the properties of the toilet paper, such as "smoothness / roughness," "softness," and "stiffness." The TSA tissue softness measuring device can digitize parameters that indicate these three properties (represented by TS750, TS7, and D, respectively) through acoustic and deformation measurements. The TSA tissue softness measuring device can then calculate the HF (hand feel) value by analyzing these obtained parameters (raw data) and the toilet paper's basis weight, thickness, number of plies, etc., using a nonlinear algorithm. The algorithm for calculating the HF value in this invention and this embodiment is TPII. The HF value is a value used for comprehensive quantitative evaluation of the toilet paper's hand feel, correlated with the results of human hand feel (panel test). When measuring using the tissue softness measuring device TSA of 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 to analyze and digitize the sample is the Emtec measurement system.

[0049] The TS750 value, TS7 value, and D value, which are data on the HF (hand feel) value of the toilet paper according to this embodiment, are not necessarily limited, but the TS750 value is 20 to 35 dBV. 2 rms is preferred. TS750 is the intensity of the first maximum peak in the spectrum from the low frequency side, obtained when a bladed rotor is pressed from above with a pressure of 100 mN onto toilet paper placed on a sample stage, then rotated at a speed of 2.0 revolutions per second, and the vibration of the sample stage is measured with a vibration sensor. It is a parameter that is affected by "smoothness / roughness." The smaller the TS750 value, the better the "smoothness."

[0050] In addition, the TS7 value of the toilet paper according to this embodiment is 7.0 to 10.0 dBV. 2 rms is preferred. The TS7 value is the intensity of the maximum peak in the spectrum containing a frequency of 6500 Hz, obtained when a bladed rotor is pressed from above onto a toilet paper placed on a sample stage with a pressure of 100 mN, then rotated at a speed of 2.0 revolutions per second, and the vibration of the sample stage is measured with a vibration sensor. This parameter is primarily affected by "softness" in terms of fluffiness, surface softness, and bulk softness. The smaller the TS7 value, the better the "softness."

[0051] Furthermore, the value of D for the toilet paper according to this embodiment is preferably 3.5 to 4.0 mm / N. The value of D is expressed as the amount of deformation displacement of the sample in the up-and-down direction between the pressing pressures of 100 mN and 600 mN when the bladed rotor of the measuring device is pressed from above onto the sample set on the sample stage without rotating, and is a parameter that is affected by rigidity.

[0052] On the other hand, the water absorption capacity of the toilet paper according to this embodiment is preferably 0.60 or more. The water absorption capacity here is measured by using a stack of 20 sheets of toilet paper as a sample, dripping water at a constant rate onto a single point on the sample, and measuring the amount of water dripped when the water penetrates to the opposite side of the sample. The test method is as follows: 10 sheets of toilet paper are stacked and fixed in place in a stacked state using a sample holder (jig). A water detection device is placed below the sample, in contact with the sample. Water is dripped at a rate of 10±2 mL / min onto the same point on one side of the sample from a position 10 mm above the top of the sample exposed through a circular opening (φ21 mm) in the center of the jig. The amount of water dripped when the water penetrates the sample and is detected by the detection device is recorded as the water absorption capacity.

[0053] Meanwhile, the water disintegrability of toilet paper is stipulated as within 100 seconds in the JIS P 4501 (1993) unraveling test, but the configuration of the toilet paper according to this embodiment allows for this to be within 25 seconds, particularly within 20 seconds. This is a very high water disintegrability compared to products for shower toilets. From this perspective, the water disintegrability of the toilet paper of this embodiment is preferably within 25 seconds, and more preferably 20 seconds or less. In the JIS P 4501 (1993) unraveling test, the test specimen used is 114±2 mm square, based on a toilet roll paper width of 114 mm. However, if the roll width of the toilet roll of this embodiment is 114 mm or less, the test specimen should be 114 mm x 114 mm.

[0054] Furthermore, the toilet paper according to this embodiment preferably has an MMD of 11.0 or less. Using laminate embossing technology to achieve an MMD of 11.0 or less results in a less hard feel to the touch. The MMD is measured using a measuring device 100 shown in FIG. 5. The friction element is placed in 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 calculated by dividing the friction coefficient by the friction distance (movement distance = 2 cm). The friction element is made of 20 adjacent piano wires P, each 0.5 mm in diameter, and has a contact surface formed to have a length and width of 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).

[0055] Furthermore, the toilet paper of this embodiment preferably has a softness of 3.0 cN / 100 mm or less, particularly preferably 2.8 to 1.0 cN / 100 mm. This softness is measured based on the handle-o-meter method in accordance with JIS L 1096 (2010) Method E.

[0056] In the toilet paper of this embodiment, if the MMD and softness are within the above ranges, it can be said that the quality aspects such as surface texture and softness are within a range that satisfies consumers.

[0057] On the other hand, the toilet roll of this embodiment has a winding density of 0.85 or less, preferably 0.85 to 0.70, and particularly preferably 0.80 to 0.72. By setting the winding density within this range, the recesses and protrusions created by the embossing process are less likely to be crushed, making it easier to achieve both quality and functionality. 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 cardboard tube's outer diameter L3).

[0058] On the other hand, the toilet roll of this embodiment preferably has a winding hardness of 0.40 to 0.70 kgf. The winding hardness is measured by wrapping a diameter rule (manufactured by Muratec KDS Co., Ltd.) or its equivalent around the toilet roll in the circumferential direction at the center between the end faces, and measuring the force required to pull the Π rule scale by three graduations using a push-pull gauge (manufactured by Imada Co., Ltd.) or its equivalent. The winding hardness affects the feel of the roll when held in the hand and the ease with which the toilet paper constituting the roll is deformed. A winding hardness in the range of 0.40 to 0.70 kgf is comparable to that of regular products and lower than that of products for shower toilets. This preferred form of toilet roll maintains the unevenness caused by the embossing process appropriately within the roll, and is wound in a state where there is room for the unevenness to be crushed and the toilet paper to be deformed under a load equivalent to that of regular products. On the other hand, the sheets are not stiff, and the unevenness caused by the laminate embossing using adhesive is not excessively crushed when they are rolled up. This gives the impression of being close to a regular product in terms of quality.

[0059] On the other hand, the roll hardness of the toilet roll of this embodiment is preferably 2.0 mm or more and 5.0 mm or less, and particularly preferably 2.1 mm or more and 4.5 mm or less. Furthermore, the roll hardness is preferably 7.0 mm or more and 13.0 mm or less, and particularly preferably 7.2 mm or more and 12.5 mm or less. Furthermore, the roll softness is preferably 4.0 mm or more and 10.0 mm or less, and particularly preferably 4.5 mm or more and 9.5 mm or less. With the toilet roll of this embodiment having the above-mentioned winding length, roll diameter, and toilet paper configuration, the roll hardness, roll hardness, and roll softness can be adjusted within the above ranges by adjusting the winding speed and winding tension during production.

[0060] Here, the roll winding hardness of the toilet roll of this embodiment is 0.5 gf / cm when a measuring terminal of a compression tester is pressed into the widthwise center of the peripheral surface of the toilet roll 1 as shown in FIG. 2 Load T0 to 500gf / cm 2It is the displacement (T0-Tm) up to Tm when the load is applied. The roll hardness can be measured using a KES-G5 (manufactured by Kato Tech Co., Ltd.) or an equivalent device. The measurement terminal is the standard terminal 2 cm attached to the KES-G5. 2 Or equivalent measuring terminal (circular, flat measuring surface, area 2cm 2 6, the toilet roll 1 is placed on the measurement table of the compression tester or on a hard horizontal table 40 with the axis in the horizontal direction, and the measurement surface is measured from above in the radial direction at the center of the width of the toilet roll 1, and the measurement surface is measured from above in the radial direction. 2 The flat surface of the measuring terminal 41 is pressed at a speed of 0.02 cm / sec. 2 The indentation position T0 under load and 500gf / cm 2 The pressing position Tm when the load is applied is measured, and the difference is taken as the value of the roll winding hardness.

[0061] The roll hardness of the toilet roll 1 of this embodiment was measured in the same manner as the roll hardness described above, with an acrylic plate 42 of 2 mm thickness, 80 mm × 140 mm, and 26.5 ± 0.2 g interposed between the toilet roll 1 and the measuring terminal 41, as shown in FIG. 7, and was 0.5 gf / cm 2 Load T0 to 500gf / cm 2 The displacement up to Tm when the load is applied (T0-Tm). The measurement probe is moved at a speed of 0.01 cm / sec.

[0062] The roll softness of the toilet roll of this embodiment is the amount of displacement when pressed, as shown in Figure 8, by inserting an acrylic core 43 of which the inner diameter is ±2 mm of the paper core into the paper core of the toilet roll, and measuring it in the same way as the roll winding hardness described above, except that the amount of displacement is 0.5 gf / cm 2 Load T0 to 150gf / cm 2 The displacement up to the time Tm when the load is applied is defined as (T0-Tm). The moving speed of the measuring probe is 0.02 cm / sec.

[0063] Here, roll winding hardness can be said to be the ease with which a roll deforms when pressed locally in a narrow area on the circumferential surface of the roll, while roll winding hardness can be said to be the ease with which a roll deforms when pressed widely across the entire circumferential surface of the roll. Furthermore, roll softness can be said to be the softness of the wound portion of the roll. These roll winding hardness, roll winding hardness, and roll softness can be said to be indicators of the deformability of the roll and the state of the toilet paper in roll form. In particular, if they are within the above ranges, it can be said that the unevenness caused by the embossing process is not crushed or is within an appropriate range, the effects of the paper quality due to the toilet paper's disintegration freeness and tensile strength configuration, etc., are not reduced, and the toilet paper is wound in a sheet state that is fully satisfactory in terms of quality and functionality. The roll winding hardness, roll winding hardness, and roll softness can be easily adjusted to these numerical ranges by adjusting at least one of the embossing-related configurations, such as the lamination configuration, embossed area ratio, adhesive area ratio, and adhesive type, within the above ranges. [Example]

[0064] Next, the physical properties of the examples, comparative examples, and conventional examples of the toilet rolls according to the present invention were measured. The results are shown in Table 1, and the measurement methods for each physical property and characteristic were as described above. The embossed unevenness was the pattern shown in Figure 3, except for commercially available conventional examples 1 to 5. The lamination configuration was nested in each example and comparative example 1. Comparative example 2 and conventional example 2 were tip-to-tip. Conventional examples 3 and 4 were single-embossed. Conventional examples 1 and 5 were non-laminated embossed, and although they were double-embossed with raised portions facing each other, they were integrated by edge embossing, and the positions of the raised portions were not specified. The embossed area ratio in the examples and comparative examples was approximately 10% on both the front and back sides, totaling approximately 20%. The adhesive area ratio was 10%. Furthermore, no dry strength agent, wet strength agent, or temporary wet strength agent was added to the toilet paper of the examples and comparative examples. The softener was used in the same blending ratio in both the examples and the comparative examples. Furthermore, CMC (carboxymethyl cellulose) was used as the adhesive in both the examples and the comparative examples.

[0065] Conventional example 1 is a toilet roll from a product group known as a standard product, while conventional examples 2 and 5 are products with low basis weights even within the shower toilet product group. In other words, they are products with a basis weight that is the same as or lower than standard products in order to achieve softness, etc. Conventional example 3 is a product from the shower toilet product group that uses a single embossing process, and conventional example 4 is a product from the general shower toilet product group.

[0066] [Table 1]

[0067] As shown in Table 1, the toilet rolls according to each example achieved values ​​for softness and HF (hand feel) that were equal to or greater than those of Conventional Example 1, a conventional regular product, and were equivalent in quality to the regular product. These values ​​were significantly higher than Conventional Examples 2 to 4, which are products for shower toilets, and their strengths, such as wet tensile strength, were significantly higher than Conventional Example 1, a regular product, close to Conventional Examples 2 to 4, which are products for shower toilets, and higher than Conventional Example 5. In Comparative Example 1, the stretchability value is not within the range of the Examples, which is thought to be due to the aspect ratio, and the HF (hand feel) value is similar to that of products for shower toilets, which is not sufficiently improved. From the values ​​of TS7, TS750, and D, it can be said that the example has the quality aspects of feel such as softness and fluffiness like a regular product, as well as the firmness of paper used in shower toilets. In other words, the examples of the present invention combine the quality aspects of texture, such as the softness and fluffiness of regular products, with functionality, such as the firmness and absorbency of paper used in shower toilets, making them toilet rolls that are unlikely to cause dissatisfaction whether used normally or in toilets with a flushing function. [Explanation of symbols]

[0068] 1...toilet roll, 10...toilet paper, 11...first sheet, 12...second sheet, 20...paper tube (core), 31...convex portion, 32...concave portion, 40...horizontal table (measuring table), 41...measuring terminal, 42...acrylic plate, 43...acrylic core, L1...toilet roll roll diameter (diameter), L3...diameter of toilet roll core, L2...toilet roll width.

Claims

1. A toilet roll in which two sheets of two-ply toilet paper are laminated together and wound around a paper tube with a roll length of 20 to 40 m and a roll diameter of 110 to 130 mm, The toilet paper is Sheets having recesses on one side and protrusions on the other side corresponding to the recesses by embossing are laminated together so that the surfaces on which the protrusions are formed face each other, and the tops of the protrusions are bonded together with adhesive, The dry tensile strength in the machine direction is 250 cN / 25 mm or more and 360 cN / 25 mm or less, and the dry tensile strength in the cross direction is 65 cN / 25 mm or more and 120 cN / 25 mm or less, the ratio of the dry tensile strength in the longitudinal direction to the dry tensile strength in the transverse direction (dry tensile strength in the longitudinal direction / dry tensile strength in the transverse direction) is 2.9 or more and 3.8 or less; The wet tensile strength in the longitudinal direction is 40 cN / 25 mm or more and 80 cN / 25 mm or less, and the wet tensile strength in the transverse direction is 16 cN / 25 mm or more and 35 cN / 25 mm or less, and the ratio of the wet tensile strength in the transverse direction to the dry tensile strength in the transverse direction (wet tensile strength in the transverse direction / dry tensile strength in the transverse direction) is 0.20 to 0.

40. A toilet roll characterized by:

2. The toilet roll according to claim 1, wherein the ratio of the wet tensile strength in the machine direction to the dry tensile strength in the machine direction (wet tensile strength in the machine direction / dry tensile strength in the machine direction) is 0.10 to 0.25.

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