Toilet roll

Abstract

To provide a toilet roll which achieves both of a quality aspect of touch such as softness, and functionality such as stability and water absorption required in use of the same in a shower toilet, and which causes hardly, dissatisfaction in normal use and in use in a toilet with a washing function.SOLUTION: In a toilet roll, toilet paper is configured so that, sheets which comprise recesses on one surface and salients corresponding to the recesses on the other surface by embossment processing, are laminated so that the salients thereof face each other, and the toilet sheets are adhered at the top part of the salients by an adhesive paste. The toilet paper has a wound length of 20 to 40 m, and a wound diameter of 110 to 130 mm, and a roll density of 0.85 or less. In the toilet roll, roll wound hardness which is a displacement amount (T0-Tm) when pressing a measurement terminal by a compression test machine, is 2.0 mm or more and 5.0 mm or less, and roll wound hardness is 7.0 mm or more and 13.0 mm or less, and roll softness is 4.0 mm or more and 10.0 mm or less.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] In the toilet roll industry, product groups are being developed to meet the diverse tastes of consumers. For example, there are products called standard or regular products, which are made of two-ply toilet paper wound to a length of about 25 to 30 m, products called long products, which are three times longer than regular products, at 75 to 90 m, and products called shower toilet products, which are made of toilet paper with increased wet strength and water absorbency, with a roll length similar to that of regular products.

[0003] Regular products are the traditional long rolled products, which have a relatively high basis weight and thickness compared to long products, and in recent years have become a high-quality product group, and are popular with consumers who value quality such as damage to the skin and softness and fluffiness. Long products are also popular with consumers who value the benefit of less frequent purchases and replacements. Shower toilet products are popular with consumers who value functions such as ease of wiping off feces and urine along with moisture that has adhered to the skin after washing the defecation and urination areas with warm or cold water in the shower toilet, and a sense of security.

[0004] Products for shower toilets have improved wet strength, sheet thickness, strength, and the ability to retain 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 with an adhesive. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 08-56868 [Patent Document 2] JP 2006-320688 A [Patent Document 3] JP 2011-153387 A 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 disintegrability, because the stiffness of the paper is increased to give a firm feel, the adhesive glue makes them feel crunchy, and the high content of wet strength agents results in poor water disintegrability. These can be dissatisfaction points for consumers who prefer shower toilets.

[0007] On the other hand, as toilets with flushing functions have become more widespread and familiar, the applicant's research has revealed that some consumers who used regular products 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 toilets with flushing functions.

[0008] Therefore, the main object of the present invention is to provide a toilet roll which combines quality aspects related to the feel of the product, such as the softness and fluffiness of normal products, with functionality such as the firmness and water absorbency of paper for use in shower toilets, and which 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 toilet paper are laminated together and wound around a paper tube. The toilet paper has a basis weight of 15.5 to 20.0 g / m 2the aspect 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, and the sheets have recesses on one side and protrusions on the other side corresponding to the recesses by embossing, the protrusions are laminated so that the protrusions face each other, and the tops of the protrusions are bonded with an adhesive, The toilet roll has a roll length of 20 to 40 m and a roll diameter of 110 to 130 mm, The winding density is 0.85 or less, and the displacement (T0-Tm) when the measuring terminal is pressed into the wire by a compression tester is 2.0 mm or more and 5.0 mm or less, the roll hardness is 7.0 mm or more and 13.0 mm or less, and the roll softness is 4.0 mm or more and 10.0 mm or less. The toilet roll is characterized by the above.

[0010] The second method is The toilet roll according to the first aspect of the present invention has a disintegrated freeness of 500 cc or more and 650 cc or less.

[0011] The third method is The toilet roll according to the first or second aspect of the present invention 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.

[0012] The fourth measure is Four sheets of toilet paper were stacked together and the test probe was pressed into the paper using a compression tester to measure the strength of the paper at 0.5gf / cm 2 Load T0 to 50gf / cm 2 The toilet roll according to any one of the first to third aspects has a stretchability, which is the amount of displacement (T0-Tm) up to Tm under load, of 1.0 mm or more.

[0013] The fifth measure is: The toilet roll according to any one of the first to fourth means described above, wherein the protruding portions of one sheet are positioned in a nested laminated form other than the protruding portions of the other sheet, and the two sheets are bonded together by an adhesive applied to the protruding portions of the sheet positioned on the outer winding surface side of the roll. Effect of the Invention

[0014] According to the present invention, a toilet roll is provided which combines quality aspects related to the feel of the toilet, such as the softness and fluffiness of normal products, with functionality such as the firmness and water absorbency of paper for shower toilets, and which is unlikely to cause dissatisfaction whether used normally or in a toilet with a flushing function. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a toilet roll according to an embodiment of the present invention. [Diagram 2] 1 is a schematic cross-sectional view of a toilet paper according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing an example of a plan view of the toilet paper according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram for explaining a method for measuring sheet stretchability according to the present invention. [Diagram 5] FIG. 1 is a schematic diagram for explaining a method for measuring MMD according to the present invention. [Figure 6] FIG. 2 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 a procedure for measuring roll hardness according to the present invention. [Figure 8] FIG. 2 is a schematic diagram for explaining a procedure for measuring roll softness according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, embodiments of the present invention will be described in detail below with reference to the drawings.

[0017] As shown in Fig. 1, the toilet roll according to this embodiment is formed by winding two-ply water-disintegrable toilet paper 10, each of which is made up of a first sheet 11 and a second sheet 12 laminated together, around a paper tube (also called a tube core) 20, and has a cylindrical shape. In the toilet roll 1 of this embodiment, the toilet paper is wound so that the first sheet 11 is on the outer side and the second sheet 12 is on the inner side.

[0018] In the case of toilet rolls, the roll length of a product group called a 2-ply regular product is about 25 to 30 m, whereas 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 the product group called a regular product.

[0019] The roll diameter L2 (diameter) of the toilet roll 1 according to this embodiment is 110 to 130 mm, preferably 110 to 120 mm. A holder for setting the toilet roll is generally made based on JIS P 4501 with a standard 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 general holder. In addition, if it is less than 110 mm in relation to the roll length, the toilet paper will be tightly wound, and the quality aspects such as the feel on the skin will tend to deteriorate. Here, the roll diameter L2 is a value measured using a diameter rule manufactured by Muratec KDS Co., Ltd. or an equivalent machine. The roll width L1 of the toilet roll 1 according to this embodiment is not limited, but is preferably 100 to 120 mm. In addition, the outer diameter L3 of the paper tube 20 is not limited, but is preferably 34 to 42φ mm.

[0020] The toilet paper 10 wound into the toilet roll 1 according to this embodiment is a two-ply toilet paper 10 in which two sheets (a first sheet 11 and a second sheet 12) having embossed recesses 32 and protrusions 31 are laminated together. The basis weight of each of the sheets 11 and 12, i.e., the basis weight per ply, of this toilet paper 10 is 15.5 to 20.0 g / m 2, preferably 17.0 to 18.5 g / m 2 If the basis weight of each of the sheets 11, 12 is within this range, the touch such as softness and fluffiness can be sufficiently achieved. In addition, the wiping ability and absorbency of water on skin that has adhered thereto can be sufficiently achieved, and furthermore, a sense of security when wiping can be sufficiently achieved. In particular, the toilet roll 1 can be made to have a touch equal to or better than that of the conventional products known as normal products, and to have the wiping ability and absorbency of water on skin that has adhered thereto, and furthermore, a sense of security when wiping, that are equal to those of the conventional products known as products for shower toilets, and thus can be made to be one that is unlikely to cause consumer dissatisfaction in terms of quality and functionality.

[0021] The thickness of the toilet paper 10, i.e., the thickness of 2 plies, is 200 to 300 μm, more preferably 230 to 290 μm. If the paper thickness is within this range, it is possible to obtain a toilet roll 1 that is unlikely to cause consumer dissatisfaction in terms of quality and functionality. The basis weight can be adjusted, for example, by the fiber basis weight, crepe rate, etc., and the paper thickness can be adjusted, for example, by the presence or absence of calendaring, calendaring pressure, embossing, crepe rate, etc.

[0022] The method for measuring the basis weight (United States basis weight) shall conform to the provisions of JIS P 8124. The method for measuring the paper thickness shall be to thoroughly condition the test piece under the conditions of JIS P 8111 (1998) (usually for about 8 hours), and then measure the thickness under the same conditions using a dial thickness gauge (thickness measuring device) "PEACOCK H type" (manufactured by Ozaki Manufacturing Co., Ltd.) as a two-ply sheet. Specifically, after making sure that there is no dirt or dust between the plunger and the measuring table, the plunger is lowered onto the measuring table, the dial thickness gauge's scale is moved to set the zero point, the plunger is then raised and the sample is placed on the testing table, and the lever is lowered in one go from the state in which the plunger is opened to 700 μm, and the gauge at that time is read. During measurement, the plunger is simply placed on the sheet, but is not pressed down. The terminal of the plunger is set so that the circular flat surface with a diameter of 10 mm is in contact with the paper surface perpendicularly, and the load during paper thickness measurement is about 70 gf. The paper thickness shall be the average value obtained by performing 10 measurements.

[0023] On the other hand, the disintegrated freeness of the toilet paper according to this embodiment is preferably 500cc to 650cc, more preferably 500cc to 620cc, and particularly preferably 500cc to 590cc. The disintegrated freeness can be adjusted by the degree of beating of the pulp fibers. In other words, the smaller the value of the 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 normal product group. When the degree of beating of the pulp fibers is low and the disintegrated freeness is in the above range, in combination with the roll configuration according to the present invention, it becomes easier to achieve both the same quality as a normal product and the same function as a shower toilet.

[0024] 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 according to 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 measurements, measurements are performed 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 performed.

[0025] (Toilet paper disintegration) Tear a sheet (toilet paper) into a sample of about 2 cm by hand, and prepare 30±0.5 g completely dry. Soak 30±0.5 g of the torn sheet in 2000 mL of water (concentration 1.5% by mass) for more than 4 hours. The water temperature at this time should be 20±5°C. After 4 hours or more have passed, place 30±0.5g of the sheet and 2000mL of water into the standard disintegrator. After checking the water temperature, disintegrate for 10 minutes. After 10 minutes, take a spoonful or so into a measuring cylinder, dilute with water, and visually check whether the fibers have been disintegrated. If sufficient disintegration is confirmed, perform the freeness measurement below on the disintegration liquid. If disintegration is insufficient, disintegrate again. At this time, visually check whether the fibers have been disintegrated in the same manner as above at 2-3 minute intervals, and repeat the operation until disintegration is complete. However, the maximum time is 30 minutes. In this way, it is possible to disintegrate the fibers with almost no change in the original properties of the fibers. The disintegration count of 1230 rpm for the standard disintegrator is the count value when the disintegrator is operated for 10 minutes.

[0026] (Freeness measurement) The following Canadian standard freeness tester is used to measure in accordance with the Canadian standard freeness test (JIS P 8121-2 2012) as follows. The Canadian standard freeness tester used should be one with the following specifications or an equivalent. The filter bottle is, for example, a bronze cylinder with a sieve plate (a disk with 97 holes of 0.5 mm diameter per cm2) set at the bottom. The hole diameter of the cock for introducing air is 4.8 mm. The measuring funnel is, for example, made of brass, with a diameter of 203 mm at the top open part and a total length of 278 mm, and the apex angle of the main cone part is machined to 29.5 ± 0.5°. In addition, there is a precisely machined bottom hole at the bottom of the funnel, and a side tube is attached to the side. The minimum diameter of the bottom hole is 3.1 mm, and it is adjusted so that when 725 ± 5 mL (20 ± 5 °C) of water 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 amount of water between the bottom of the funnel and the overflow water level is adjusted to 23.5 ± 0.2 mL.

[0027] Next, a measurement liquid having a solids concentration of 0.3% by mass is prepared from the disintegrated 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 mass%. Approximately 500 g of the diluted sample is taken and placed in a container for weighing, and weighed to within an accuracy of 0.5 g (weighed value A). Next, place the No. 2 filter paper in a hot air dryer (105±2°C), dry it until it reaches a constant weight, and weigh it to an accuracy of 0.01 g (weighed value B). The No. 2 filter paper is placed in the Buchner funnel, wetted with water, and suction is started. Next, about 500 g of the collected sample is transferred to the Buchner funnel and the water is sucked. After suction is completed, the No. 2 filter paper with the fibers is removed, passed through a sheet dryer set at 120°C twice, and then dried in a hot air dryer. (105±2℃) for 10 minutes and then remove it. Weigh the mass of the No. 2 filter paper with the removed fiber to an accuracy of 0.01 g (weighed value C).

[0028] After determining the weighed values ​​A to C as described above, the solid content concentration X (mass%) of the sample is calculated using the following formula (rounding width: 0.01). Solid concentration X = (((Weight value C) - (Weight value B)) / (Weight value A)) x 100 Based on the calculated solid content X (mass%), the amount D of the diluted macerating liquid to be collected is determined using the following formula so that the diluted macerating liquid contains 3 g of bone-dry pulp. Collection amount D(g)=300÷X Put disintegration liquid D (g) containing 3 g of bone-dried pulp into a 1000 mL measuring cylinder and dilute it to 1000 mL to prepare a measurement liquid with a solids concentration of 0.3 mass%. Measure the temperature at this time with an accuracy of 1°C.

[0029] Next, the adjusted test liquid is measured using the above-mentioned Canadian Standard Freeness Tester. When pouring the test liquid into the tester, the opening of the measuring cylinder is covered with the palm of the hand and the cylinder is turned upside down three times to stir. After pouring the test liquid, the freeness is allowed to flow down after 5 seconds. When the drainage from the side pipe has stopped, weigh the amount of drainage 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 the 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 the disintegration 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.

[0030] The fibers constituting the toilet paper according to the present embodiment are not necessarily limited, but it is preferable that 60% to 85% by mass of the fibers constituting the toilet paper are pulp derived from hardwood. It is particularly preferable that 65% to 80% by mass of the fibers constituting the toilet paper are pulp derived from hardwood. Hardwood-derived pulp has a short fiber length and is easy to improve the texture of the paper surface. On the other hand, hardwood-derived pulp has a short fiber length and is less likely to reduce water absorbency and firmness, but as described above, by low beating so that the disintegration freeness is slightly higher, the firmness and water absorbency can be fully expressed. In addition, LBKP (hardwood kraft pulp), LUKP, LOKP, etc. are known as hardwood-derived pulp, but bleached LBKP is preferable. In addition, it is preferable that the fibers other than hardwood-derived pulp are pulp derived from softwood. In this case, chlorine-bleached NBKP (softwood kraft pulp) is preferable.

[0031] Here, 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) of the toilet paper according to this embodiment is 2.9 or more and 3.8 or less. Preferably, it is 3.0 or more and 3.7 or less. Here, the longitudinal direction is also called the MD direction, which is the flow direction during papermaking. The transverse direction of the paper is also called the CD direction, which is the direction perpendicular to the flow direction (MD direction) during papermaking. The aspect ratio of the toilet paper according to this embodiment is higher than that of normal products and is close to that of products for shower toilets. This aspect ratio can be adjusted by the J / W ratio during base paper production. By setting this aspect ratio, quality and functionality are compatible, especially in combination with the roll configuration described below.

[0032] In addition, the toilet paper according to this embodiment preferably has a ratio of the wet tensile strength in the horizontal direction to the dry tensile strength in the horizontal direction (wet tensile strength in the horizontal direction / dry tensile strength in the horizontal direction) of 0.20 to 0.40. It is particularly preferably 0.21 to 0.35. The tensile strength of toilet paper is generally lower in the horizontal direction than in the vertical direction, and the inventors have found that the difference in this low tensile strength in the horizontal direction between dry and wet can affect how people feel when wiping off moisture. In other words, the smaller the difference in tensile strength in the horizontal direction between dry and wet, the easier it is to obtain a sense of firmness and security when wiping off moisture. For this reason, for example, when used in a toilet with a flushing function, it can affect the sense of security when wiping off moisture and the like that has adhered to the skin by flushing. This ratio of the wet tensile strength in the horizontal direction to the dry tensile strength in the horizontal direction (wet tensile strength in the horizontal direction / dry tensile strength in the horizontal direction) is considered to be a numerical value equivalent to that of conventional shower toilet products. The 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) can be adjusted by the J / W ratio during base paper making. However, in this case, it is preferable to adjust the tensile strength in the longitudinal direction to be slightly higher and the tensile strength in the transverse direction to be slightly lower. By combining this adjustment with the range of disintegration freeness and the laminate embossing process described below, the 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) can be adjusted to the above range.

[0033] Here, the tensile strength of the toilet paper according to this embodiment is not necessarily limited, but the dry tensile strength in the longitudinal direction is preferably 250 cN / 25 mm or more and 360 cN / 25 mm or less, and the dry tensile strength in the transverse direction is preferably 65 cN / 25 mm or more and 120 cN / 25 mm or less. In addition, the wet tensile strength in the longitudinal direction is preferably 40 cN / 25 mm or more and 80 cN / 25 mm or less, and the wet tensile strength in the transverse direction is preferably 18 cN / 25 mm or more and 35 cN / 25 mm or less. These preferred tensile strengths are slightly lower in the transverse dry tensile strength range than conventional normal products, and slightly higher in the transverse wet tensile strength range than normal products.

[0034] Dry tensile strength is a value measured based on JIS P 8113 (2006) and is measured as follows. The test pieces are cut to about 25 mm (±0.5 mm) wide x 150 mm long in both the vertical and horizontal directions. The test pieces are measured as multi-ply. The test machine used is a load cell tensile test machine TG-200N manufactured by Minebea Co., Ltd. or an equivalent machine. The gripping distance is 100 mm, and the tensile speed is set to 100 mm / min for vertical measurement and 50 mm / min for horizontal measurement. The measurement is performed by clamping both ends of the test piece to the grips of the test 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 performed five times for each direction, and the average of the measured values ​​is the dry tensile strength in each direction.

[0035] Wet tensile strength is a value measured based on JIS P 8135 (1998) and is measured as follows. The test piece is cut to a width of 25 mm (±0.5 mm) x length of 150 mm in both the vertical and horizontal directions. If the toilet paper is multi-ply, it 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 interval is set to 100 mm, and the tensile speed is set to 50 mm / min. The test piece is cured for 10 minutes in a dryer at 105°C. After clamping both ends of the test piece to the grips of the test machine, water is applied horizontally to the center of the test piece with a width of about 10 mm using a flat brush soaked in water, and then immediately a tensile load is applied in the vertical direction to the paper piece, and the measurement is performed by reading the indicated value (digital value) 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 the wet tensile strength in each direction.

[0036] On the other hand, the toilet paper according to the present embodiment may contain a known dry strength agent, a dry strength agent, and a temporary wet strength agent, but since the strength agent may reduce the softness and water disintegrability, it is preferable that these strength agents are not added. Therefore, it is preferable that the toilet paper according to the present embodiment does not contain at least one, preferably two, and particularly all of the dry strength agent, the dry strength agent, and the temporary wet strength agent. The toilet paper according to the present embodiment can be a toilet roll with sufficient quality and functionality without using a strength agent, due to the essential configuration of the present invention, such as the roll configuration specific to the present invention described below, the aspect ratio of the tensile strength, and the laminate embossing process, and the technical common knowledge of a person skilled in the art.

[0037] In addition, the toilet paper of this embodiment is preferably internally added with a softener. Examples of the softener 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 a plurality of types may be added. Examples of the cationic fatty acid amide-based softener include a reaction product of an amide-based compound obtained by reacting polyalkylene polyamines with monocarboxylic acids and epihalohydrin. The content of the softener is not necessarily limited, but is preferably 0.5 to 4.0 kg / t of pulp.

[0038] On the other hand, as shown in Figures 2 and 3, the toilet paper of this embodiment has a structure in which a recess 32 is formed on one side and a protrusion 31 corresponding to the recess 32 is formed on the other side by embossing, particularly on the first sheet 11 and the second sheet 12 constituting the toilet paper 10, and in particular, these sheets are laminated so that the surfaces on which the protrusions are formed face each other, and are bonded together at the tops of the protrusions 31 with an adhesive glue to form an integrated laminate. Therefore, the toilet paper according to this embodiment has a form in which only the recesses 32 are present on the front and back surfaces.

[0039] 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 for the recess 32 is one without corners from the standpoint of softness and other skin feel, 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.

[0040] The embossed area ratio (total area of ​​recesses / total area of ​​sheets) in the toilet paper 10 of this embodiment is not necessarily limited, but is preferably 15 to 28%. On each surface 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.

[0041] 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 depict an appropriate geometric pattern such as a floral pattern, a heart pattern, etc. as a whole, as shown in Fig. 3, is desirable from the standpoint of design.

[0042] Here, the lamination form 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 form in which the convex portion of the first sheet faces the convex portion of the second sheet, or a so-called nested form in which the convex portion 31 of the first sheet 11 faces the part of the second sheet 12 other than the convex portion 31, and the convex portion 31 of the second sheet 12 faces the part of the first sheet 11 other than the convex portion 31, as shown in FIG. 2. In particular, the nested form is preferable. The nested form is easy to express the softness of the toilet paper because the positions of the concave portions on the front and back are different. In addition, the number of convex portions 31 positioned in a columnar shape between the sheets is increased, and the gaps between the sheets are difficult to collapse, and it is easy to sufficiently improve the wiping ability, absorbency, and sense of security when wiping off moisture on the skin. Furthermore, the thickness can be made thinner than the tip-to-tip form. For this reason, in a roll form such as a toilet roll, where a specified length needs to be contained within a specified roll diameter, each sheet itself can be made to have a high basis weight and low density, and can be wound up somewhat looser than tip-to-tip toilet paper, so the unevenness caused by the embossing is less likely to be crushed, making it particularly excellent in terms of both quality and functionality.

[0043] 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 protruding portions 31, but are not necessarily bonded at all of the protruding portions 31. In one preferred embodiment, no adhesive glue is applied to the protruding portions 31 of the second sheet 12 located on the inner winding surface side of the roll, and the first sheet 11 and the second sheet 12 are bonded by adhesive glue applied to all or part of the protruding portions 31 of the first sheet 11 located on the outer winding surface side of the roll. In this form of toilet roll, since there are no adhesive portions near the outer winding surface side of the roll, the roll is easily felt soft, especially when held in the hand.

[0044] In addition, the adhesion area ratio (total area of ​​adhesion parts / 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 adhesion area ratio is 20% or less, the hard texture of the toilet paper, especially that achieved by the laminate embossing technique, becomes difficult to feel. The adhesion 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.

[0045] 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 in particular, CMC, which is a cellulose-based water-soluble adhesive, is preferred.

[0046] Here, in the configuration of the toilet paper according to this embodiment, when four sheets are stacked and a measuring probe is pressed into the toilet paper using a compression tester, the compressibility is 0.5 gf / cm 2 Load T0 to 50gf / cm 2 The stretchability, which is the amount of displacement (T0-Tm) up to Tm when a load is applied, can be set to 1.0 mm or more. Therefore, the toilet paper of this embodiment preferably 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 a standard terminal 2 cm attached to the KES-G5. 2 Or equivalent measuring terminal (circular, measuring surface flat, 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 with a size 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 when loaded and 50gf / cm 2The pressing position Tm when the load is applied to the sheet is measured, and the difference is the value of elasticity. The sample is the paper width (roll width) x 100 mm. Elasticity affects quality aspects such as softness and fluffiness, especially in the thickness direction. In shower toilet products, emphasis is placed on ensuring gaps between sheets by laminate embossing technology, so the elasticity is generally about 0.5 to 0.7 mm. Elasticity exceeding 1.0 mm is equal to or greater than that of normal products. As described above, the toilet paper according to the present invention can be configured to have a thickness of 1.0 mm or more. In particular, this value of elasticity can be achieved more easily by adjusting at least one of the configurations related to the embossing, such as the lamination form, embossed area ratio, adhesive area ratio, and adhesive type, within the above range. In addition, the elasticity of the toilet paper of this embodiment is measured by taking a sample from a position 1 to 15% from the end of the toilet roll. If the elasticity at this position is within the above range, the unevenness caused by the embossing process will not be crushed, and the quality will be fully satisfactory.

[0047] In addition, the toilet paper according to this embodiment is a 2 cm standard terminal. 2 The compression characteristic LC value, which can be measured simultaneously with or separately from the above-mentioned stretchability using a machine equivalent to KES-G5 (manufactured by Kato Tech Co., Ltd.), 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 recovery characteristic RC value is preferably in the range of 40 to 50. These values ​​are equal to or greater than those of normal products and shower toilet products. The closer the compression characteristic LC value is to 1.0, the harder the product is when compressed; the higher the compression energy WC value, the easier it is to compress; and the closer the recovery characteristic RC value is to 100, the better the recovery.

[0048] On the other hand, the toilet paper according to this embodiment preferably has a HF (hand feel) value of 95 or more, measured by a tissue softness measuring device TSA. With the configuration of the toilet paper according to this embodiment, the HF (hand feel) value can be 95 or more. A HF (hand feel) value of 95 or more is a high value equal to or higher than that of normal product groups. The HF (hand feel) value is measured on the surface on the outer surface side of the roll. The measurement sample is taken from a position 1 to 15% from the end of the toilet roll.

[0049] The tissue softness measuring device TSA is a tissue softness measuring device TSA manufactured by Emtec Electronic GmbH (Japan distributor, Nippon Luft Co., Ltd.) of Germany and its equivalents. The feeling of use of toilet paper is affected by the characteristics of the toilet paper, such as "smoothness / roughness," "softness," and "rigidity." This tissue softness measuring device TSA can digitize the parameters that are indicators of these three characteristics (represented by TS750, TS7, and D, respectively) through acoustic measurement and deformation measurement. The tissue softness measuring device TSA can calculate the HF (hand feel) value by performing analysis using a nonlinear algorithm based on these obtained parameters (raw data) and the basis weight, thickness, number of plies, etc. of the toilet paper. The algorithm for the HF value according to the present invention and this embodiment is TPII. The HF value is a value used for comprehensive quantitative evaluation of the feel of the toilet paper in correlation with the results of human touch (panel test). When performing measurements 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 for analysis and quantification is the Emtec measurement system.

[0050] 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 preferable. TS750 is the intensity of the first maximum peak in the spectrum seen from the low frequency side, obtained when a bladed rotor is pressed from above with a pressure of 100mN against a piece of 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".

[0051] In addition, the TS7 value of the toilet paper according to this embodiment is 7.0 to 9.5 dBV. 2 RMS is preferable. The TS7 value is the intensity of the maximum peak in the spectrum containing a frequency of 6500 Hz, which is obtained when a bladed rotor is pressed from above against a toilet paper placed on a sample stage with a pressure of 100 mN, then rotated at a rotation speed of 2.0 revolutions per second, and the vibration of the sample stage is measured with a vibration sensor. This is a parameter that is mainly affected by "softness" in terms of fluffiness, surface softness, and bulk softness. The smaller the TS7 value, the better the "softness".

[0052] 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 in the vertical direction of the sample when the sample is set on the sample stage and pressed from above with pressing pressures of 100 mN and 600 mN, respectively, without rotating the bladed rotor of the measuring device, and is a parameter that is affected by rigidity.

[0053] On the other hand, the water absorption of the toilet paper according to this embodiment is preferably 0.70 or more. The water absorption here is the amount of water dripped when 20 sheets of toilet paper are stacked as a sample, water is dripped at a point on the sample at a constant speed, and the water penetrates to the opposite side of the dripped side. The test method is as follows. Ten sheets of toilet paper are stacked and fixed in a stacked state by a sample press. A water detection device is placed at a position below the sample where it contacts the sample. Water is dripped at 10±2 mL / min from a position 10 mm above the sample to the same point on one side of the sample, and the amount of water dripped when the water penetrates the sample and the detection device detects the water is recorded as the water absorption.

[0054] On the other hand, the water disintegrability of toilet paper is stipulated to be within 100 seconds in the JIS P 4501 (1993) unraveling test, but the toilet paper according to the embodiment can be within 25 seconds, particularly within 20 seconds. This is a very high water disintegrability compared to products for shower toilets. From this point of view, the water disintegrability of the toilet paper according to the present embodiment is preferably within 25 seconds, more preferably 20 seconds or less. In the JIS P 4501 (1993) unraveling test, the test piece used in the test is 114±2 mm square based on the toilet roll paper width of 114 mm, but when the toilet roll according to the present embodiment has a roll width of 114 mm or less, the test piece is the roll width x 114 mm.

[0055] In addition, the toilet paper according to this embodiment preferably has an MMD of 11.0 or less. If the MMD is set to 11.0 or less while using the laminate embossing technique, the texture is less likely to feel hard. The MMD is measured using a measuring device 100 shown in FIG. 5, in which the contact surface of 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, and the friction element is moved 2 cm at a speed of 0.1 cm / s in approximately the same direction as the tension is applied, and the friction coefficient at this time is measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.) or an equivalent device. The value obtained by dividing the friction coefficient by the friction distance (movement distance = 2 cm) is the MMD. The friction element is made of 20 piano wires P with a diameter of 0.5 mm arranged adjacent to each other, 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, the tip of which is made of 20 piano wires P (with a curvature radius of 0.25 mm).

[0056] 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) E method.

[0057] 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 properties and softness are within a range that satisfies consumers.

[0058] Here, the toilet roll of this embodiment is characterized by a winding density of 0.85 or less, preferably 0.85 or less and 0.70 or more, particularly preferably 0.80 or less and 0.72 or more. By setting the winding density in this range, the concave and convex parts by the embossing process are not easily crushed, and the properties of the toilet paper itself are not easily lost by rolling it into a roll, so that both quality and functionality are achieved. 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 calculated by {cross-sectional area of ​​the roll winding diameter (outer diameter) L1 part} - (cross-sectional area of ​​the paper tube outer diameter L3 part).

[0059] 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 a value obtained by winding a diameter rule (manufactured by Muratec KDS Co., Ltd.) or its equivalent around the center between the end faces of the toilet roll in the circumferential direction, and measuring the force required to pull the Π rule scale by three graduations with 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 of deformation of the toilet paper constituting the roll. The winding hardness in the range of 0.40 to 0.70 kgf is a value comparable to that of the normal product group, and is lower than that of the product group for shower toilets. The toilet roll of this preferred form is wound in a state in which the unevenness caused by the embossing is appropriately maintained within the roll, and there is room for the unevenness to be crushed and the toilet paper to be deformed by a load equivalent to that of the normal product. On the other hand, the sheets are not stiff, and the unevenness caused by the laminate embossing using adhesive is not excessively crushed when rolled. Therefore, the quality gives the impression of being close to that of a regular product.

[0060] On the other hand, the toilet roll of this embodiment is characterized in that the roll winding hardness is 2.0 mm or more and 5.0 mm or less, and preferably 2.1 mm or more and 4.5 mm or less. The roll winding hardness is 7.0 mm or more and 13.0 mm or less, and preferably 7.2 mm or more and 12.5 mm or less. Furthermore, the roll softness is 4.0 mm or more and 10.0 mm or less, and preferably 4.5 mm or more and 9.5 mm or less. These are adjusted by the winding speed and winding tension during production. The toilet roll of this embodiment is a toilet paper according to the present invention, such as the basis weight, aspect ratio, and embossing configuration of the toilet paper, which is wound to the above-mentioned length and diameter, and further adjusted in roll winding hardness, roll winding hardness, and roll softness, so that the concave and convex parts due to the embossing are not easily crushed, and the properties of the toilet paper itself are not easily lost by rolling it, and quality and functionality are compatible.

[0061] Here, the roll winding hardness of the toilet roll of this embodiment is, as shown in FIG. 6, 0.5 gf / cm when a measuring probe of a compression tester is pressed into the widthwise center of the peripheral surface of the toilet roll 1. 2 Load T0 to 500gf / cm 2 The amount of displacement (T0-Tm) up to the time when the load is applied is Tm. 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, measuring surface flat, area 2cm 2 More specifically, as shown in FIG. 5, 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 2 cm in the radial direction from above at the center of the width of the toilet roll 1. 2 The flat surface of the measuring terminal 41 is pressed against the surface at a speed of 0.02 cm / sec. 2 The indentation position T0 when loaded and 500gf / cm 2 The pressing position Tm when the load is applied is measured, and the difference is taken as the roll tightness.

[0062] The roll winding hardness of the toilet roll 1 of this embodiment was measured in the same manner as the roll winding 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 the load Tm (T0-Tm) is measured. The measurement probe is moved at a speed of 0.01 cm / sec.

[0063] The roll softness of the toilet roll of this embodiment is the amount of displacement of the press, measured in the same manner as the roll hardness, by inserting an acrylic core 43 of ±2 mm inside the paper core of the toilet roll as shown in Figure 8. However, the amount of displacement is 0.5 gf / cm 2 Load T0 to 150gf / cm 2The displacement up to the time when the load is applied is defined as (T0-Tm). The moving speed of the measuring probe is 0.02 cm / sec.

[0064] The roll winding hardness can be said to be the ease of deformation when a localized narrow area of ​​the roll circumferential surface is pressed, and the roll winding hardness can be said to be the ease of deformation when a wide area of ​​the entire roll circumferential surface is pressed. The roll softness can be said to be the softness of the wound part of the roll. These roll winding hardness, roll winding hardness, and roll softness can be said to be one of the indicators of the deformability of the roll and the state of the toilet paper in the roll form, and in particular, if they are in the above range, it can be said that the unevenness due to the embossing is not crushed or is in an appropriate range, the effect of the paper quality due to the configuration of the tensile strength of the toilet paper is not reduced, and the toilet paper is wound in a sheet state that is sufficiently satisfactory in terms of quality and function. 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 configurations related to the embossing, such as the lamination form, the embossed area ratio, the adhesive area ratio, and the adhesive type, within the above range. EXAMPLES

[0065] Next, the physical properties of the examples, comparative examples, and conventional examples of the toilet roll according to the present invention were measured. The results are shown in Table 1, and the measurement methods for each physical property and characteristic are as described above. The unevenness caused by the embossing process was the pattern shown in FIG. 3, except for conventional examples 1 to 5, which are commercially available products. The lamination form is a nested form in each example and comparative example 1. Comparative example 2 and conventional example 2 are tip-to-tip forms. Conventional examples 3 and 4 are single embossed forms. Conventional examples 1 and 5 are non-laminated embossed forms, and although they are double embossed in which the convex parts face each other, they are laminated and integrated by edge embossing, and the positions of each convex part are not specified. The embossed area ratio in the examples and comparative examples is about 10% on both the front side and the back side, totaling about 20%. The adhesive area ratio was 10%. In addition, dry strength agents, wet strength agents, and temporary wet strength agents are not added to the toilet paper according to 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.

[0066] Conventional example 1 is a toilet roll from a product group called normal products, while conventional examples 2 and 5 are products with low basis weights even within the product group for shower toilets. In other words, they are products whose basis weight is set to be the same as or lower than normal products in order to achieve softness, etc. Conventional example 3 is a product from the product group for shower toilets that uses single embossing, and conventional example 4 is a product from the product group for general shower toilets.

[0067] [Table 1]

[0068] As shown in Table 1, the toilet rolls according to each embodiment have softness and HF (hand feel) values ​​equal to or greater than those of Conventional Example 1, a conventional regular product, and are equivalent in quality to the regular product. The values ​​are significantly higher than Conventional Examples 2 to 4, which are products for shower toilets, and the strengths, such as wet tensile strength, are significantly higher than Conventional Example 1, which is 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 elasticity value is not within the range of the Examples, and the HF (hand feel) value is similar to that of products for shower toilets, which is presumably due to the aspect ratio, and is not sufficiently improved. In conclusion, the examples of the present invention combine quality aspects related to the feel of a regular product, such as softness and fluffiness, with functionality such as the firmness and absorbency of paper for use in shower toilets, making it a toilet roll that is unlikely to cause dissatisfaction whether used normally or in a toilet with a flushing function. [Explanation of symbols]

[0069] 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 (measurement table), 41...measurement terminal, 42...acrylic plate, 43...acrylic core, L1...toilet roll roll diameter, L3...diameter of toilet roll core, L2...width of toilet roll.

Claims

1. A toilet roll in which two sheets of toilet paper are laminated together to form a two-ply toilet paper roll is wound around a paper tube, The toilet paper has a basis weight of 15.5 to 20.0 g / m ２ the aspect 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, and the sheets have recesses on one side and protrusions on the other side corresponding to the recesses by embossing, the protrusions are laminated so that the protrusions face each other, and the tops of the protrusions are bonded with an adhesive, The toilet roll has a roll length of 20 to 40 m and a roll diameter of 110 to 130 mm, The winding density is 0.85 or less, the roll hardness, which is the amount of displacement (T0-Tm) when a measuring terminal is pressed into the roll by a compression tester, is 2.0 mm or more and 5.0 mm or less, the roll hardness is 7.0 mm or more and 13.0 mm or less, and the roll softness is 4.0 mm or more and 10.0 mm or less. A toilet roll characterized by the above.

2. 2. The toilet roll according to claim 1, wherein the disintegrated freeness of the toilet paper is 500 cc or more and 650 cc or less.

3. The toilet roll according to claim 1 or 2, wherein the ratio of the wet tensile strength in the cross direction to the dry tensile strength in the cross direction (wet tensile strength in the cross direction / dry tensile strength in the cross direction) of the toilet paper is 0.20 to 0.

40.

4. Four sheets of the toilet paper were stacked together, and the test probe was pressed into the paper using a compression tester to measure the strength of the paper at 0.5 gf / cm ２ Load T0 to 50gf / cm ２ The toilet roll according to claim 1 or 2, wherein the stretchability, which is the amount of displacement (T0-Tm) up to Tm under load, is 1.0 mm or more.

5. 3. The toilet roll according to claim 1 or 2, wherein the two sheets are laminated in a nested form in which the convex portions of one sheet are positioned in a portion other than the convex portions of the other sheet, and the two sheets are bonded together by an adhesive applied to the convex portions of the sheet positioned on the outer surface side of the roll.

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