Toilet roll

Abstract

Provided is a toilet roll which has both skin-touch-related quality such as softness and fluffiness, and functionality such as toughness and water absorbability required for use in a smart toilet, and which is not susceptible to dissatisfaction when used in a conventional scenario or in a toilet with a cleaning function. The problem is solved by a toilet roll in which a double-layer toilet paper obtained by laminating two paper layers is wound around a paper tube, the roll length being 20-40 m, the roll diameter being 110-130 mm, and the weight per unit area of each paper layer being 15.5-20.0 g / m < 2 >. The toilet paper is characterized in that paper layers, which are provided with concave parts on one surface and convex parts corresponding to the concave parts on the other surface, of the toilet paper are laminated in a manner that the convex part forming surfaces face each other, and the paper layers are adhered at the tops of the convex parts through an adhesive; the dissociation freeness of the toilet paper is 500 cc or more and 650 cc or less, the aspect ratio of the dry tensile strength is 2.9 or more and 3.8 or less, and the value of the wet tensile strength in the transverse direction / dry tensile strength in the transverse direction is 0.20-0.40.

Description

TECHNICAL FIELD

[0001] The present application relates to a sanitary paper roll wound in a roll shape from a sanitary paper in a strip shape. BACKGROUND

[0002] In the field of sanitary paper rolls, development work according to product groups suitable for various preferences is continuously performed due to diversification of consumer preferences. For example, there are product groups called standard or regular products, which are wound from double-ply sanitary paper in a winding length of about 25 m to 30 m, product groups called long-size products, which have a winding length of about 3 times that of the regular products, reaching about 75 m to 90 m, and product groups called products for intelligent toilet seats, which have a winding length as flat as that of the regular products but have sanitary paper wound with particularly improved wet strength and water absorbency.

[0003] The regular products are products in which the conventional winding length is used, and have a relatively high weight per unit area and a high degree of paper thickness, and in recent years, have become a high-quality product group, and are favored by consumers who place importance on qualities such as skin touch feeling, softness, fluffiness, and the like. The long-size products are favored by consumers who place importance on the advantage of less frequency of purchase / replacement. The products for intelligent toilet seats are favored by consumers who place importance on functions such as wiping of water, feces, and urine attached to the skin after cleaning of the skin after cleaning of the defecation part and the urination part with warm water or water in the intelligent toilet seat, and wiping property, sense of security, and the like.

[0004] The products for intelligent toilet seats have improved wet strength, thickness, and strength of the paper layer, and further improved the retention of the interlayer void by, for example, using a temporary wet strength agent such as a cationic aldehyde-modified polyacrylamide-based copolymer, or using a laminated embossing technique in which embossed layers are laminated and bonded by an adhesive.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT DOCUMENTS

[0007] Patent Document 1: Japanese Patent Laid-Open No. 08-56868

[0008] Patent Document 2: Japanese Patent Laid-Open No. 2006-320688

[0009] Patent Document 3: Japanese Patent Laid-Open No. 2011-153387 SUMMARY

[0010] PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] However, products for a bidet toilet, in order to embody a sense of toughness, the stiffness of paper is increased, or a hard and hard feeling caused by an adhesive is easily felt, or a poor hydrolyzability is caused by a high compounding of a wet strength agent or the like, and thus, in terms of quality such as softness and bulkiness, and hydrolyzability, the products are inferior to a conventional product group. These can be points of dissatisfaction for consumers who prefer a product for a bidet toilet.

[0012] On the other hand, the applicant found through investigation that, as the bidet toilet with a washing function is gradually entering households with the popularization of the bidet toilet with a washing function, among consumers who select a conventional product in view of quality such as softness and bulkiness, some feel that the conventional product is insufficient in terms of water absorption and paper toughness when used on a bidet toilet with a washing function.

[0013] Therefore, the main object of the present application is to provide a sanitary tissue paper which, while giving consideration to quality related to skin touch such as softness and bulkiness like a conventional product and paper toughness, water absorption and the like functions like a product for a bidet toilet, does not easily cause dissatisfaction whether used in a conventional scene or on a bidet toilet with a washing function.

[0014] Technical means for solving the problem

[0015] The first means for solving the above problem is

[0016] A sanitary tissue paper in which a double-layered toilet paper in which two paper layers are stacked is wound around a paper tube, characterized in that The aforementioned sanitary tissue paper, The winding length is 20 m to 40 m, and the winding diameter is 110 mm to 130 mm; The aforementioned toilet paper, The weight per unit area of each paper layer is 15.5 g / m 2 to 20.0 g / m 2 , and the paper layers, which have recesses on one side and protrusions corresponding to the recesses on the other side by embossing processing, are stacked with the protrusion-formed surfaces facing each other, and are adhered at the top of the protrusions by an adhesive; and the disintegration freeness of the aforementioned toilet paper is 500 cc or more and 650 cc or less, the ratio of the longitudinal dry tensile strength to the transverse dry tensile strength, that is, the longitudinal dry tensile strength / transverse dry tensile strength, is 2.9 or more and 3.8 or less, and the ratio of the transverse wet tensile strength to the transverse dry tensile strength, that is, the transverse wet tensile strength / transverse dry tensile strength, is 0.20 to 0.40.

[0017] The second means is the aforementioned first means, in which When four sheets of the aforementioned toilet paper are overlapped and pressed into the testing terminal using a compression testing machine, the pressure drops from 0.5 gf / cm³. 2 Position under load: T0 to 50 gf / cm 2 The displacement (T0-Tm) between positions Tm under load is called extensibility, which is 1.0 mm or more.

[0018] The third method is toilet paper made using the first or second method described above, as follows. Its stacking form is a nested form in which the convex part of one paper layer is located in the non-convex part of another paper layer, and the two paper layers are bonded together by applying an adhesive to the convex part of the paper layer located on the outer surface of the roll.

[0019] Invention Effects

[0020] According to the present invention, a toilet paper roll is provided that combines the softness, fluffiness and other skin-touch qualities of conventional toilet paper with the strength, absorbency and other functional properties of toilet paper used in smart toilets. It is unlikely to cause dissatisfaction whether used in regular scenarios or on toilets with a washing function. Attached Figure Description

[0021] Figure 1 This is a perspective view of a toilet paper roll according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic cross-sectional view of the toilet paper according to an embodiment of the present invention.

[0023] Figure 3 This is a top view of an example of toilet paper according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram illustrating the method for measuring the paper layer stretchability of the present invention.

[0025] Figure 5 This is a schematic diagram illustrating the method for measuring MMD according to the present invention.

[0026] Figure 6 This is a schematic diagram illustrating the method for measuring the winding tightness of the paper roll according to the present invention.

[0027] Figure 7 This is a schematic diagram illustrating the steps for measuring the paper roll winding hardness of the present invention.

[0028] Figure 8 This is a schematic diagram illustrating the steps for measuring the softness of the roll paper according to the present invention. Detailed Implementation

[0029] Next, an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0030] As Figure 1 shown, the sanitary paper roll of the present embodiment is a double-layered sanitary paper 10 having hydrolysis property, in which two paper layers, a first paper layer 11 and a second paper layer 12, are laminated, and is wound around a paper tube (also referred to as a core) 20. The sanitary paper roll 1 of the present embodiment is in a cylindrical shape. In the sanitary paper roll 1 of the present embodiment, the sanitary paper is wound with the first paper layer 11 on the outer surface side and the second paper layer 12 on the inner surface side.

[0031] In the sanitary paper roll, the roll length of a product group called a conventional product is about 25 m to 30 m, and the roll length of the sanitary paper roll 1 of the present embodiment is 20 m to 40 m, preferably 20 m to 30 m, which is the same as that of the product group called the conventional product.

[0032] The roll diameter L2 (diameter) of the sanitary paper roll 1 of the present embodiment is 110 mm to 130 mm, preferably 110 mm to 120 mm. A stand for placing the sanitary paper roll is generally made based on JIS P 4501 with 120 mm as a reference. The roll diameter of the sanitary paper roll of the present embodiment is 110 mm to 130 mm or less, and can be placed in a general stand. In addition, if it is set to less than 110 mm due to the relationship with the roll length, the sanitary paper is in a state of being tightly wound, and the quality in terms of skin touch and the like is likely to be reduced. Here, the roll diameter L2 is a value measured using a caliper manufactured by MURATEC-KDS Co., Ltd. or the like. Note that the paper roll width L1 of the sanitary paper roll 1 of the present embodiment is not limited, but is desirably 100 mm to 120 mm. In addition, the outer diameter L3 of the paper tube 20 is also not limited, but is desirably 34 mm to 42 mm.

[0033] The sanitary paper 10 of the sanitary paper roll 1 of the present embodiment is a double-layered sanitary paper 10 in which two paper layers (a first paper layer 11 and a second paper layer 12) having recesses 32 and protrusions 31 obtained by embossing are laminated. The unit area weight of each paper layer 11, 12 of the sanitary paper 10, that is, the unit area weight of each layer is 15.5 g / m 2 ~20.0 g / m 2 , preferably 17.0 g / m 2 ~18.5 g / m 2If the weight per unit area of each paper layer 11, 12 is within the range, the softness, the fluffy feeling, and the like can be made sufficient. In addition, the wiping property for the skin to which moisture is attached, the water absorption, and further the sense of security at the time of wiping can be made sufficient. In particular, it is possible to produce the sanitary paper 1 having the skin touch that is equivalent to or better than the conventional product group called a conventional product, and having the wiping property for the skin to which moisture is attached, the water absorption, and further the sense of security at the time of wiping that are equivalent to the conventional product group called a bidet product, which is difficult to cause dissatisfaction of consumers in terms of quality and function.

[0034] The thickness of the sanitary paper 10, that is, the thickness of the double layers is preferably 200 μm to 300 μm, and more preferably 230 μm to 290 μm. If the thickness of the paper is within the range, it is possible to produce the sanitary paper 1 which is difficult to cause dissatisfaction of consumers in terms of quality and function. The weight per unit area can be adjusted by, for example, the weight per unit area of the fiber, the creping rate, and the like; and the thickness of the paper can be adjusted by, for example, whether or not a calendering treatment is performed, the calendering pressure, an embossing process, the creping rate, and the like.

[0035] The measurement method of the weight per unit area (basis weight) is in accordance with the regulation of JIS P 8124. In addition, the measurement method of the thickness of the paper is as follows: After a test piece is sufficiently (usually for about 8 hours) conditioned under the conditions of JIS P 8111 (1998), the double layers are directly measured using a dial thickness gauge (thickness measuring device) "PEACOCK H type" (Ozaki Seisakusho) under the same conditions. Specifically, it is confirmed that there is no garbage, dust, or the like between the plunger and the measurement table, the plunger is lowered onto the measurement table, the scale of the aforementioned dial thickness gauge is moved to align with the zero point, then the plunger is raised and the test sample is placed on the test table, the rod is lowered at once from the state in which the plunger is opened to 700 μm, and the gauge at that time is read. At the time of measurement, only the plunger is placed without being pressed. The circular flat surface of the terminal of the plunger having a diameter of 10 mm is brought into abutment with the paper surface perpendicularly, and the load at the time of measurement of the thickness of the paper is about 70 gf. It is to be noted that the thickness of the paper is an average value obtained by measuring 10 times.

[0036] On the other hand, the disintegration freeness of the toilet paper of the present embodiment is 500 cc or more and 650 cc or less, preferably 500 cc or more and 620 cc or less, and particularly preferably 500 cc or more and 590 cc or less. The disintegration freeness can be adjusted by the beating degree of the pulp fiber. In other words, the smaller the value of the disintegration freeness, the higher the degree of beating of the pulp fiber; the higher the value, the lower the degree of beating of the pulp fiber. The disintegration freeness of the toilet paper of the present embodiment is slightly higher than the value of the toilet paper of the product group of the general conventional product. The toilet paper of the present embodiment, by setting the beating degree of the pulp fiber to a low beating degree, setting the disintegration freeness within the above range, and using other configurations of the present invention, can achieve both the quality equivalent to the conventional product and the function equivalent to the product for the intelligent toilet.

[0037] Note that the disintegration freeness is measured by the Canadian Standard Freeness method of JIS P 8121-2:2012 (Test method of freeness of pulp) for the pulp obtained by disintegrating the toilet paper using a standard disintegrator according to JIS P 8220-1, JIS P 8220-2:2012 (Pulp - Disintegration method). More specifically, the disintegration freeness is measured as follows. Note that, in the following measurement, two measurements are performed for the same sample, and the measured value is the average thereof. In the case where the two measured values differ by 2% or more from the average, an additional test is performed.

[0038] (Disintegration of toilet paper)

[0039] For the paper layer (toilet paper), the sample is torn by hand to a size of about 2 cm, and 30 ± 0.5 g is prepared under absolute dryness. The 30 ± 0.5 g of the torn paper layer is immersed in 2000 mL of water for 4 hours or more (concentration of 1.5 mass %). Note that the water temperature at this time is 20 ± 5°C.

[0040] After 4 hours or more, the 30 ± 0.5 g of the paper layer and the 2000 mL of water are all put into a standard disintegrator. After confirming the water temperature, disintegration is performed for 10 minutes.

[0041] After 10 minutes, a medicine spoonful is collected in a measuring cylinder, diluted with water, and it is confirmed by visual observation whether the fibers are disintegrated. In the case where it is confirmed that the disintegration is sufficient, the disintegration liquid is subjected to the following freeness measurement. In the case where the disintegration is not sufficient, disintegration is performed again. At this time, it is confirmed by visual observation whether the fibers are disintegrated at intervals of 2 to 3 minutes as described above, and the operation is repeated until the disintegration. However, the maximum is 30 minutes. In this way, the fibers can be disintegrated without changing the original properties of the fibers. Note that the disintegration count of the standard disintegrator is 1230 rpm, which is the count value when the disintegrator is operated for 10 minutes.

[0042] (Freedom from foreign matter)

[0043] The following Canadian Standard Freedom from Foreign Matter Tester was used, and the measurement was performed in accordance with the Canadian Standard Freedom from Foreign Matter Test (JIS P8121-2 2012) as follows. The Canadian Standard Freedom from Foreign Matter Tester uses a tester of the following specifications or the like.

[0044] The filter cylinder is, for example, a cylinder made of bronze, and a sieve plate (a circular plate having 97 holes each having a diameter of 0.5 mm per 1 cm2) is provided at the bottom thereof. The tap for inputting air has a hole diameter of 4.8 mm. The measuring funnel is, for example, made of brass, has a diameter of 203 mm of the open upper portion, a total length of 278 mm, and a top angle of the main conical portion is mechanically finished at 29.5 ± 0.5°. In addition, a bottom hole that is precisely mechanically finished is provided at the bottom of the funnel, and a side tube is provided at the side surface. The minimum diameter of the bottom hole is 3.1 mm, and is adjusted so as to discharge 530 ± 5.3 mL of water per minute when 725 ± 5 mL (20 ± 5°C) of water is supplied to the funnel per minute. The side tube is a hollow tube having an inner diameter of 12.7 mm, and penetrates the wall surface of the funnel. The amount of water between the bottom of the funnel and the overflow level is 23.5 ± 0.2 mL.

[0045] Next, the measurement liquid having a solid content concentration of 0.3 mass% was prepared from the dissociation liquid obtained by the above-described "(Dissociation of toilet paper)" as follows.

[0046] First, the dissociation liquid obtained by the above-described "(Dissociation of toilet paper)" was diluted to a concentration of 0.3 to 1.0 mass%. About 500 g of the diluted sample was collected and weighed in a container for mass measurement with an accuracy of 0.5 g (weighed value A).

[0047] Next, the No. 2 filter paper was placed in a hot air dryer (105 ± 2°C) and dried to a constant weight, and weighed with an accuracy of 0.01 g (weighed value B).

[0048] The above-described No. 2 filter paper was placed in a Buchner funnel and moistened with water, and suction was started. Next, about 500 g of the collected sample was moved to the Buchner funnel, and moisture was sucked. After the completion of the suction, the No. 2 filter paper loaded with fibers was taken out, and was placed in a paper sample dryer set at 120°C for 2 times, and was taken out after being placed in a hot air dryer (105 ± 2°C) for 10 minutes. The mass of the taken-out No. 2 filter paper loaded with fibers was weighed with an accuracy of 0.01 g (weighed value C).

[0049] After the weighed values A to C were obtained as described above, the solid content concentration X (mass%) of the sample was calculated by the following equation (with a rounding-off margin of 0.01).

[0050] Solid content concentration X = (( (measured value C) - (measured value B) ) / (measured value A) ) x 100

[0051] Based on the calculated solid content concentration X (mass %), the amount D of the diluted dissociation solution was determined by the following calculation formula in a manner containing 3 g of absolutely dry pulp.

[0052] Amount D (g) = 300 ÷ X

[0053] The dissociation solution D (g) containing 3 g of absolutely dry pulp was charged into a 1000 mL graduated cylinder and diluted to 1000 mL to prepare a measurement solution having a solid content concentration of 0.3 mass %. The temperature at this time was measured with an accuracy of 1 °C.

[0054] Next, the prepared measurement solution was measured using the above-mentioned Canadian Standard Freeness Tester. Note that, when the measurement solution was injected into the tester, the opening portion of the graduated cylinder was plugged with a palm and stirred upside down for about 3 times. The filtered water was made to flow 5 seconds after the measurement solution was injected.

[0055] After the drainage of the side tube was stopped, the mass of the drainage amount discharged from the side tube was measured with an accuracy of 0.1 g, and the mass was converted into a volume (mL). Next, the measurement value was corrected to the freeness at a standard temperature of 20 °C according to Appendix D "Freeness Correction Table to Temperature 20 °C" of JIS P 8121-2 2012 and the water temperature of the measurement solution. The average of the values corrected to the temperature of 20 °C was taken as the dissociation freeness. Note that the accuracy was set to 1 mL. In addition, in the case where the concentration did not accurately reach 0.3 mass %, the concentration correction was performed according to Appendix C "Freeness Correction Table to Concentration 0.30%" of JIS P 8121-2 2012.

[0056] On the other hand, the fiber constituting the sanitary paper of the present embodiment is not necessarily limited, but it is preferable that 60 mass % or more and 85% or less of the fibers constituting the paper be pulp derived from a broad-leaved tree. It is particularly preferable that 65% or more and 80% or less be pulp derived from a broad-leaved tree. The pulp derived from a broad-leaved tree has a short fiber length, and it is easy to make the texture of the paper surface good. On the other hand, the pulp derived from a broad-leaved tree has a short fiber length, and the water absorption and the strong feeling are not easily decreased, but the sanitary paper of the present embodiment, by using low beating, makes the dissociation freeness slightly high, and sufficiently exhibits the strong feeling and the water absorption. Note that, as the pulp derived from a broad-leaved tree, LBKP (broad-leaved tree kraft pulp), LUKP, LOKP, and the like are known, but it is desirable to be LBKP subjected to bleaching treatment. Note that, as the fiber other than the pulp derived from a broad-leaved tree, it is desirable to be pulp derived from a needle-leaved tree. In this case, it is desirable to be NBKP (needle-leaved tree kraft pulp) subjected to chlorine bleaching.

[0057] Here, the ratio of the longitudinal dry tensile strength to the transverse dry tensile strength (longitudinal dry tensile strength / transverse dry tensile strength) of the toilet paper in this embodiment is 2.9 or higher and 3.8 or lower. Preferably, it is 3.0 or higher and 3.7 or lower. Here, the longitudinal direction, also known as the MD direction, is the flow direction during papermaking. The transverse direction, also known as the CD direction, is the direction perpendicular to the flow direction during papermaking (MD direction). The aspect ratio of the toilet paper in this embodiment is higher than that of conventional products and close to that of products used in smart toilets. This aspect ratio can be adjusted by the J / W ratio during papermaking. It is speculated that by setting this aspect ratio, the elasticity of the paper layer, especially as described later, will be improved.

[0058] Furthermore, the ratio of the transverse wet tensile strength to the transverse dry tensile strength (transverse wet tensile strength / transverse dry tensile strength) of the toilet paper in this embodiment is 0.20 to 0.40, preferably 0.21 to 0.35. Regarding the tensile strength of toilet paper, the transverse value is generally lower than the longitudinal value. The inventors have found that this lower transverse tensile strength, when dry versus wet, can sometimes affect the feeling when wiping away moisture. In other words, the smaller the difference in transverse tensile strength when dry versus wet, the easier it is to obtain a strong and reassuring feeling when wiping away moisture. Therefore, for example, it can sometimes affect the feeling of reassurance when wiping away moisture adhering to the skin after washing when using it on a toilet with a washing function. The ratio of the transverse wet tensile strength to the transverse dry tensile strength (transverse wet tensile strength / transverse dry tensile strength) of the toilet paper in this embodiment is set to a value equivalent to that of existing products used in smart toilets. The ratio of the transverse wet tensile strength to the transverse dry tensile strength (transverse wet tensile strength / transverse dry tensile strength) of the toilet paper in this embodiment can be adjusted by the J / W ratio during the papermaking process. However, in this case, the adjustment is to slightly increase the longitudinal tensile strength and slightly decrease the transverse tensile strength. This adjustment, combined with the range of the degree of dissociation and the lamination and embossing process described later, can adjust the ratio of the transverse wet tensile strength to the transverse dry tensile strength (transverse wet tensile strength / transverse dry tensile strength) to the above-mentioned range.

[0059] Here, the tensile strength of the toilet paper in this embodiment is not necessarily limited, but the longitudinal dry tensile strength is preferably 250 cN / 25 mm or more and 360 cN / 25 mm or less, and the transverse dry tensile strength is preferably 65 cN / 25 mm or more and 120 cN / 25 mm or less. Furthermore, the longitudinal wet tensile strength is preferably 40 cN / 25 mm or more and 80 cN / 25 mm or less, and the transverse wet tensile strength is preferably 18 cN / 25 mm or more and 35 cN / 25 mm or less. This preferred tensile strength falls within the range where the transverse dry tensile strength is slightly lower than that of conventional products, and the transverse wet tensile strength is slightly higher than that of conventional products.

[0060] The dry tensile strength was determined based on JIS P 8113 (2006) and was measured as follows. Test pieces approximately 25 mm wide (± 0.5 mm) × 150 mm long were used in both the longitudinal and transverse directions. The test pieces were measured directly in multiple layers. The testing machine used was the Minebea TG-200N tensile testing machine with a force sensor, manufactured by Minebea Corporation, or similar equipment. The clamp spacing was set to 100 mm, and the tensile speed was set to 100 mm / min for longitudinal measurements and 50 mm / min for transverse measurements. The measurement was performed as follows: the two ends of the test piece were secured to the clamps of the testing machine, a tensile load was applied to the paper in the vertical direction, and the reading at the point of paper breakage (digital value) was recorded. Five sets of samples were prepared for both the longitudinal and transverse directions, and five measurements were performed in each direction. The average value of the measured values ​​was taken as the dry tensile strength in each direction.

[0061] The wet tensile strength was determined based on JIS P 8135 (1998) and was performed as follows. Test pieces were cut to approximately 25 mm wide (± 0.5 mm) × 150 mm long in both the longitudinal and transverse directions. In the case of multi-layered toilet paper, the test was performed directly in a multi-layered configuration. The testing machine used was the Minebea TG-200N tensile testing machine with a force sensor, manufactured by Minebea Corporation, or similar equipment. It is important to note that the clamp spacing was set to 100 mm and the tensile speed to 50 mm / min. Test pieces were used that had been cured in a dryer at 105°C for 10 minutes. The test was performed as follows: After securing both ends of the test piece to the clamps of the testing machine, water was applied horizontally to the center of the test piece using a flat-headed brush with a water content of approximately 10 mm. Immediately afterwards, a tensile load was applied to the paper in the vertical direction, and the reading at the point of paper breakage (digital value) was recorded. Five sets of samples were prepared in both the longitudinal and transverse directions, and five measurements were performed in each direction. The average value of the measured values ​​was taken as the wet tensile strength in each direction.

[0062] On the other hand, while the toilet paper of this embodiment can contain known dry strength agents, dry strength agents, and temporary wet strength agents, paper strength agents may reduce softness and hydrolysis, so it is preferable not to add these paper strength agents. Therefore, the toilet paper of this embodiment preferably does not contain at least one of the dry strength agents, dry strength agents, and temporary wet strength agents, more preferably does not contain two of them, and most preferably does not contain any of them. Based on the essential components of this invention, such as degree of dissociation, tensile strength, and lamination embossing, as well as the technical knowledge of those skilled in the art, the toilet paper of this embodiment can be made into toilet paper with sufficiently excellent quality and function even without the use of paper strength agents.

[0063] Furthermore, 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 can be any of cationic fatty acid ester compounds or nonionic fatty acid ester compounds, and multiple types may be added. Alternatively, examples of cationic fatty acid amide-based softeners include reactants obtained by reacting amide compounds obtained from the reaction of polyalkylene polyamines with monocarboxylic acids and epoxy halides. The content of the softener is not necessarily limited, but it is desirable to contain 0.5 to 4.0 kg / t of pulp.

[0064] On the other hand, the toilet paper of this embodiment has the aforementioned paper material, and, as a mechanical structure, such as Figure 2 and Figure 3 As shown, particularly on each of the first paper layer 11 and the second paper layer 12 constituting the toilet paper 10, recesses 32 are provided on one side and protrusions 31 corresponding to the recesses 32 are provided on the other side through embossing. In particular, the protruding surfaces of these paper layers are stacked in an opposing manner, and are bonded together at the top of the protrusions 31 by an adhesive to form a laminated, integrated structure. Therefore, the toilet paper of this embodiment has a form in which only recesses 32 exist on the front and back sides.

[0065] The top view shape of each recess 32 is not limited. Furthermore, it is not necessary for them all to be the same shape. From the viewpoint of softness and skin-touch feel, a shape without corners is desirable for the recess 32; specifically, a circle, ellipse, rounded triangle, rounded quadrilateral, or rounded polygon are preferred. A circle or ellipse is particularly preferred. The area of ​​the recess 32 is preferably 0.5 mm. 2 ~8 mm 2 1.0 mm is particularly preferred. 2 ~3.2 mm 2 .

[0066] The embossed area ratio (total area of ​​recesses / total area of ​​paper layers) of the toilet paper 10 in this embodiment is not necessarily limited, but is preferably 15% to 28%. In each surface of the first and second paper layers, it is preferably 8% to 14%. Here, the embossed area ratio of the toilet paper in this embodiment is a value obtained by measuring a sample taken from the end of the roll side, excluding the tail seal.

[0067] The arrangement (embossed pattern) of the recesses 32 in the toilet paper 10 of this embodiment is not limited. As one example, such as... Figure 3 As shown, arranging the recesses 32 appropriately as a whole to depict appropriate geometric patterns such as flowers and heart shapes is preferred in terms of appearance.

[0068] Here, in this embodiment, the first paper layer 11 and the second paper layer 12 of the toilet paper 10 are stacked in a so-called tip-to-tip configuration where the protrusions of the first paper layer and the protrusions of the second paper layer face each other. Figure 2 As shown, the toilet paper can be in a nested form where the protrusions 31 of the first paper layer 11 are opposite to the portions other than the protrusions 31 of the second paper layer 12, and the protrusions 31 of the second paper layer 12 are opposite to the portions other than the protrusions 31 of the first paper layer 11. The nested form is particularly preferred. Because the positions of the recesses on the front and back sides differ, the nested form easily exhibits the softness of the toilet paper. Furthermore, the increased number of columnar protrusions 31 between the paper layers makes it difficult for the gaps between the layers to be crushed, thus improving the wiping performance, absorbency, and overall comfort when wiping moist skin. Furthermore, the thickness can be thinner than the top-to-top form. Therefore, in roll-up configurations like toilet paper where a specified length needs to be contained within a specified roll diameter, compared to the top-to-top form, the nested form allows each paper layer to have a high weight per unit area and low density, and is wound more loosely. Therefore, the embossing process makes the raised and recessed areas less likely to be crushed, resulting in superior quality and functionality.

[0069] Furthermore, while the first paper layer 11 and the second paper layer 12 in the toilet paper 10 of this embodiment can be bonded at all the protrusions 31, it is not necessary to bond them at all the protrusions 31. As a preferred method, instead of applying adhesive to the protrusions 31 of the second paper layer 12 located on the inner surface side of the roll, the first paper layer 11 and the second paper layer 12 are bonded by applying adhesive to all or part of the protrusions 31 of the first paper layer 11 located on the outer surface side of the roll. Because there is no bonded portion near the outer surface side of the roll, the toilet paper roll made in this manner is particularly easy to feel soft when holding the roll.

[0070] Furthermore, the adhesive area ratio (total area of ​​the adhesive portion / total area of ​​the paper layer) in the toilet paper 10 of this embodiment is not necessarily limited, but it is particularly desirable to be 20% or less. Additionally, a lower limit of 9% is particularly desirable. If the adhesive area ratio is 20% or less, it is particularly difficult to perceive the stiffness of the toilet paper resulting from the lamination and embossing technology. It should be noted that the adhesive area ratio of the toilet paper in this embodiment is a value obtained by measuring a 30 cm sample taken from the end of the roll, excluding the tail seal.

[0071] 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 particularly preferred are water-soluble cellulose adhesives, namely CMC.

[0072] Regarding the composition of the toilet paper in this embodiment, four sheets of toilet paper can be stacked, so that when pressed into the testing terminal by a compression tester, the pressure drops from 0.5 gf / cm. 2 Position under load: T0 to 50 gf / cm 2 The displacement (T0-Tm) between positions T0 and Tm under load is called elasticity, which is 1.0 mm or more. Therefore, the toilet paper of this embodiment preferably has an elasticity of 1.0 mm or more. Elasticity can be measured using a KES-G5 (manufactured by Kato Tech Co., Ltd.) or similar equipment. The measuring terminal uses the 2 cm standard terminal attached to the KES-G5. 2 Or similar measuring terminals (circular, with a flat measuring surface and an area of ​​2 cm²) 2 More specifically, such as Figure 4 As shown, four sheets of toilet paper 10 are stacked on the measuring platform or a rigid horizontal platform 40 of the compression testing machine and left to stand. The measuring surface is moved at a speed of 0.02 mm / s to a depth of 2 cm. 2 The flat measuring terminal was pressed onto these tissues, and its 0.5 gf / cm² value was measured. 2 The pressure point T0 under load and the load increased to 50 gf / cm 2The difference between the pressing position Tm and the actual pressing position is taken as the value of elasticity. It should be noted that the sample is the paper width (roll width) × 100 mm. Elasticity particularly affects qualities such as softness and fluffiness in the thickness direction. In the product group for smart toilets, since the importance of ensuring the gaps between paper layers through lamination and embossing technology is emphasized, the elasticity is generally around 0.5 mm to 0.7 mm. Elasticity exceeding 1.0 mm is at the same level as or even higher than that of conventional products. As described above, in the composition of the toilet paper of the present invention, the elasticity can be 1.0 mm or more. In particular, by adjusting at least one of the above-mentioned embossing-related components such as the lamination pattern, embossing area ratio, adhesive area ratio, and adhesive type within the above range, it is easier to obtain this elasticity value. Furthermore, the elasticity of the toilet paper in this embodiment is sampled 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 embossing process will not crush the unevenness, achieving a sufficiently satisfactory effect in terms of quality.

[0073] It should be noted that the toilet paper in this embodiment uses an attached standard terminal 2 cm. 2 The KES-G5 (manufactured by Kato Tech Co., Ltd.) and similar equipment can be used to measure the compression characteristic LC value, which can be measured simultaneously with or separately from the aforementioned extensibility, preferably in the range of 0.35 to 0.70; the compression energy WC value, preferably in the range of 1.25 to 1.75; and the resilience RC value, preferably in the range of 40 to 50. These values ​​are equivalent to or even higher than those of conventional products and products used in smart toilets. The closer the compression characteristic LC value is to 1.0, the more rigid the product is considered to be under compression; the higher the compression energy WC value, the easier it is to compress; and the closer the resilience RC value is to 100, the better the resilience is considered.

[0074] On the other hand, the toilet paper of this embodiment preferably has an HF (hand feel) value of 95 or higher, as measured by a paper softness measuring device (TSA). In the composition of the toilet paper of this embodiment, the HF (hand feel) value can be 95 or higher. An HF (hand feel) value of 95 or higher is a high value, equivalent to or even higher than that of conventional products. It should be noted that the HF (hand feel) value is measured on the outer surface of the roll. Furthermore, the test sample is taken from a position 1% to 15% from the end of the toilet paper roll.

[0075] The paper softness measuring device TSA is manufactured by Emtec Electronic GmbH (Japan's agent is Rufuto Co., Ltd.) of Germany. The feel of toilet paper is affected by its characteristics such as "smoothness / roughness," "softness," and "stiffness." The TSA can quantify these three characteristics using acoustic and deformation measurements (represented as TS750, TS7, and D, respectively). Furthermore, based on these parameters (raw data) and the toilet paper's weight per unit area, thickness, and number of layers, the TSA uses a non-linear algorithm to calculate the HF (hand feel) value. It should be noted that the HF value algorithm used in this invention and embodiment is TPII. The HF value is a comprehensive quantitative evaluation of the tactile feel of toilet paper in relation to the results of a human tactile panel test (sensory test). In the TSA test of the paper softness measuring device in this embodiment, the sample is processed into a circle with a diameter of approximately 112.8 mm using a sample punch from Emtec Corporation, and the software for analysis and numerical conversion is the Emtec Measurement System.

[0076] The values ​​of TS750, TS7, and D, which constitute the HF (hand feel) value of the toilet paper in this embodiment, are not necessarily limited, but the value of TS750 is preferably 20 to 35 dBV. 2 RMS. It's important to note that TS750 refers to the intensity of the first maximum peak in the spectrum observed from the low-frequency side when a bladed rotor is pressed into a piece of toilet paper placed on a sample stage with a pressure of 100 mN from above and rotated at 2.0 revolutions per second, using a vibration sensor to measure the vibration of the sample stage. TS750 is a parameter affected by "smoothness / roughness". Regarding the value of TS750, the smaller the value, the better the "smoothness".

[0077] Furthermore, the TS7 value of the toilet paper in this embodiment is preferably 7.0 to 9.5 dBV. 2 RMS. It's important to note that the TS7 value refers to the intensity of the maximum peak in the frequency spectrum (containing 6500 Hz) obtained when a bladed rotor is pressed into a piece of toilet paper placed on a sample stage with a pressure of 100 mN from above and rotated at 2.0 revolutions per second, measured by a vibration sensor. This TS7 value is a parameter primarily affected by aspects of "softness," including fluffiness, surface softness, and overall fluffiness and softness. Regarding the TS7 value, the lower the value, the better the "softness."

[0078] Furthermore, the D-value of the toilet paper in this embodiment is preferably 3.5 mm / N to 4.0 mm / N. It should be noted that the D-value represents the vertical displacement of the sample placed on the sample stage when, without rotating the bladed rotor of the measuring device, it is pressed from above with pressing pressures of 100 mN and 600 mN, respectively. This D-value is a parameter affected by stiffness.

[0079] On the other hand, the absorbency of the toilet paper in this embodiment is preferably 0.70 or higher. Here, absorbency is defined as the amount of water added when 20 sheets of toilet paper are stacked together as a sample, and water is dripped onto a single point on the sample at a constant speed until the water penetrates to the opposite side of the dripping surface. The test method is as follows: Ten sheets of toilet paper are stacked together and fixed in a stacked state by a sample clamp. A water detection device is placed at a position below the sample, in contact with the sample. Starting 10 mm above the sample, water is dripped onto the same point on one side of the sample at a rate of 10 ± 2 mL / min. The amount of water added when it penetrates the sample and is detected by the detection device is recorded as the absorbency.

[0080] On the other hand, the hydrolytic property of toilet paper is specified as less than 100 seconds in the looseness test of JIS P 4501 (1993), but in the composition of the toilet paper of this embodiment, it can be less than 25 seconds, and particularly less than 20 seconds. Its hydrolytic property is very high compared to products used in smart toilets. Based on this, the hydrolytic property of the toilet paper of this embodiment is preferably less than 25 seconds, and more preferably less than 20 seconds. It should be noted that in the looseness test of JIS P 4501 (1993), the test piece used in the test is set to be 114 ± 2 mm square, based on a toilet paper width of 114 mm. However, in the toilet paper of this embodiment, when the roll width is set to 114 mm or less, the test piece is a test piece of roll width × 114 mm.

[0081] Furthermore, the toilet paper of this embodiment is expected to have an MMD of 11.0 or less. If the MMD is set to 11.0 or less while using lamination and embossing technology, it is difficult to perceive a firm texture against the skin. It should be noted that the MMD... Figure 5The measuring apparatus 100 shown involves bringing the contact surface of a friction element into contact with the surface of a test sample subjected to a tension of 20 g / cm in a specified direction, with a contact pressure of 25 g. Simultaneously, the friction element is moved 2 cm at a speed of 0.1 cm / s in approximately the same direction as the applied tension. The coefficient of friction at this moment is measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.) or a similar device. The value obtained by dividing the coefficient of friction by the friction distance (movement distance = 2 cm) is the MMD. The friction element is formed by 20 adjacent piano wires P with a diameter of 0.5 mm, and has a contact surface formed with a length and width of 10 mm. At the front end of the contact surface, a unit bulge formed by the 20 piano wires P (radius of curvature 0.25 mm) is formed.

[0082] Furthermore, the softness of the toilet paper in this embodiment is preferably 3.0 cN / 100 mm or less, and particularly preferably 2.8 cN / 100 mm to 1.0 cN / 100 mm. This softness is determined based on the Handle-O-Meter method according to JIS L 1096 (2010) E method.

[0083] In the toilet paper of this embodiment, if the MMD and softness are within the above range, it can be said that the surface quality and softness are within the range that consumers can be satisfied with.

[0084] On the other hand, the winding density of the toilet paper roll in this embodiment is 0.85 or less, preferably 0.85 or less and 0.70 or more, and particularly preferably 0.80 or less and 0.72 or more. By setting this winding density range, the concave and convex portions formed by the embossing process are less likely to be crushed, making it easier to balance quality and function. It should be noted that the winding density is calculated by (paper thickness × roll length × number of layers) ÷ (cross-sectional area of ​​the roll). In addition, the cross-sectional area of ​​the roll is calculated by {cross-sectional area of ​​the roll diameter (outer diameter) L1 portion} - (cross-sectional area of ​​the paper tube outer diameter L3 portion).

[0085] On the other hand, the preferred winding stiffness of the toilet paper in this embodiment is 0.40 kgf to 0.70 kgf. Winding stiffness is determined by measuring the force required to pull the π ruler scale three graduations outwards by winding the toilet paper circumferentially around the center between the end faces using a caliper (manufactured by MURATEC-KDS Co., Ltd.) or a similar device, and using a force gauge (manufactured by IMADA Co., Ltd.) or a similar device. Winding stiffness affects the feel of the toilet paper when held and the deformability of the toilet paper itself. A winding stiffness in the range of 0.40 kgf to 0.70 kgf is comparable to that of conventional products and lower than that of products used in smart toilets. In this preferred embodiment of toilet paper, the irregularities formed by embossing are adequately maintained within the roll, and the winding is performed with a margin sufficient to allow the irregularities to be crushed and deformed even under the same load as conventional products. On the other hand, the paper layers are neither stiff nor excessively crushed due to lamination and embossing with adhesives during winding. Therefore, in terms of quality, it gives an impression close to that of a regular product.

[0086] On the other hand, the roll tightness of the toilet paper in this embodiment is preferably 2.0 mm or more and 5.0 mm or less, particularly preferably 2.1 mm or more and 4.5 mm or less. Furthermore, the roll stiffness is preferably 7.0 mm or more and 13.0 mm or less, particularly preferably 7.2 mm or more and 12.5 mm or less. Further, the roll softness is preferably 4.0 mm or more and 10.0 mm or less, particularly preferably 4.5 mm or more and 9.5 mm or less. In the above-mentioned roll length, roll diameter, and toilet paper configuration, the roll tightness, roll stiffness, and roll softness of the toilet paper in this embodiment can be adjusted to the above ranges by adjusting the winding speed and winding tension during manufacturing.

[0087] Here, the roll tightness of the toilet paper in this embodiment refers to, for example, Figure 6 As shown, when the measuring terminal is pressed into the center of the circumference of toilet paper roll 1 in the width direction using a compression tester, the pressure drops from 0.5 gf / cm. 2 Position under load: T0 to 500 gf / cm 2 The displacement between positions T0 and Tm under load (T0-Tm). The tightness of the paper roll winding can be measured using the KES-G5 (manufactured by KatoTech Co., Ltd.) and similar equipment. The measuring terminal uses the 2 cm standard terminal included with the KES-G5. 2 Or similar measuring terminals (circular, with a flat measuring surface and an area of ​​2 cm²) 2 More specifically, such as Figure 5As shown, on the testing platform of the compression testing machine or a rigid horizontal platform 40, the toilet paper roll 1 is placed statically with the axis transverse, and the measuring surface is moved at a speed of 0.02 cm / s to a depth of 2 cm. 2 The flat measuring terminal 41 is pressed from above toward the center of the width direction of the toilet paper roll 1 in a radial direction, and its value of 0.5 gf / cm is measured. 2 The pressure point T0 under load and the load increased to 500 gf / cm 2 The difference between the pressing position Tm and the actual pressing position is used as the winding tightness value.

[0088] The roll paper winding stiffness in this embodiment of the toilet paper roll 1 is as follows: Figure 7 As shown, a 2 mm thick, 80 mm × 140 mm, 26.5 ± 0.2 g acrylic plate 42 is sandwiched between the toilet paper roll 1 and the measuring terminal 41. The plate is 0.5 gf / cm², and its thickness was measured in the same manner as the toilet paper roll winding tightness. 2 Position under load: T0 to 500 gf / cm 2 The displacement (T0-Tm) between positions Tm under load. However, the moving speed of the measuring terminal is set to 0.01 cm / second.

[0089] The toilet paper roll of this embodiment has a softness, such as... Figure 8 As shown, an acrylic core 43 with an inner diameter of ±2 mm is inserted into the paper tube of the toilet paper roll. The displacement amount is obtained by measuring the same amount as the roll winding tightness mentioned above. However, the displacement amount is set to 0.5 gf / cm. 2 Position under load: T0 to 150 gf / cm 2 The displacement between positions T0 and Tm under load (T0-Tm). Additionally, the moving speed of the measuring terminal is set to 0.02 cm / second.

[0090] Here, the tightness of the toilet paper roll can be described as its susceptibility to deformation when pressed in a narrow, localized area around the roll's perimeter, while the hardness of the roll can be described as its susceptibility to deformation when pressed over a large area around the roll's perimeter. The softness of the roll can be described as the suppleness of the wound portion. These factors—tightness, hardness, and softness—can also be considered indicators of the roll's deformability and its overall condition within its roll form. Especially when these indicators are within the specified ranges, it means that the embossing process has not resulted in crushing or the degree of crushing is within an appropriate range. The paper quality, including the degree of dissociation and tensile strength, is not compromised. In terms of quality and function, the toilet paper is wound in a very satisfactory paper layer state. It should be noted that by adjusting at least one of the embossing-related factors such as the layering pattern, embossing area ratio, adhesive area ratio, and adhesive type within the specified ranges, it is easy to bring the tightness, hardness, and softness of the roll into these numerical ranges.

[0091] Example

[0092] Next, the physical properties of the toilet paper rolls of the present invention, including examples, comparative examples, and conventional examples, were measured. The results are shown in Table 1, and the methods for measuring each physical property and characteristic are as described above. Furthermore, the embossing process was used to create the raised or recessed areas, except for conventional examples 1 to 5 which are commercially available products. Figure 3 The patterns shown are as follows. Regarding the layering form, each embodiment and Comparative Example 1 is a nested form. Comparative Example 2 and Existing Example 2 are top-to-top forms. Existing Examples 3 and 4 are single-sided embossed forms. Existing Examples 1 and 5 are non-laminated embossed forms; although they are double-sided embossed with opposing protrusions, they achieve integrated layering through edge embossing, and the positions of the protrusions are not specified. The embossing area ratio in the embodiments and comparative examples is approximately 10% on both the front and back sides, totaling approximately 20%. The adhesive area ratio is set to 10%. In addition, no dry strength agent, wet strength agent, or temporary wet strength agent is added to the toilet paper in the embodiments and comparative examples. The softener is used in the same proportion in the embodiments and comparative examples. Furthermore, CMC (carboxymethyl cellulose) is used as the adhesive in the embodiments and comparative examples.

[0093] It should be noted that Existing Example 1 refers to toilet paper from the product group called "regular products," while Existing Examples 2 and 5 are products with lower weight per unit area from the product group for smart toilets. In other words, these are products whose weight per unit area is reduced to be equal to or lower than that of regular products in order to exhibit softness, etc. Existing Example 3 is a product from the product group for smart toilets that uses a single-sided embossing process, and Existing Example 4 is a product from the product group for general smart toilets.

[0094] [Table 1]

[0095] As shown in Table 1, the toilet paper rolls of each embodiment achieved values ​​equal to or even higher than those of existing conventional products (Existing Example 1) in terms of softness and HF (hand feel) value, and were of the same quality as conventional products. The values ​​were significantly higher than those of products for smart toilets (Existing Examples 2-4). Furthermore, the wet tensile strength and other strengths were significantly higher than those of conventional products (Existing Example 1), close to those of products for smart toilets (Existing Examples 2-4), and higher than those of Existing Example 5.

[0096] Comparative Example 1 is presumably due to the aspect ratio, the stretch value is outside the range of the embodiment, and the HF (hand feel) value is the same as that of the product group used in smart toilets, and a sufficient improvement has not been achieved.

[0097] Therefore, the embodiments of the present invention combine the softness, fluffiness and other skin-touch qualities of conventional products with the strength, absorbency and other functional properties of paper used in smart toilets, making it a toilet paper roll that is unlikely to cause dissatisfaction whether used in regular scenarios or on a toilet with a cleaning function.

[0098] Figure Labels

[0099] 1… Toilet paper roll, 10… Toilet paper, 11… First paper layer, 12… Second paper layer, 20… Paper tube (core), 31… Protrusion, 32… Recess, 40… Horizontal platform (measuring platform), 41… Measuring terminal, 42… Acrylic plate, 43… Acrylic core, L1… Roll diameter of toilet paper roll, L3… Diameter of toilet paper roll core, L2… Width of toilet paper roll.

Claims

1. A toilet paper roll, comprising two layers of toilet paper stacked together and wound onto a paper tube, characterized in that, The toilet paper roll. Its length is 20 m to 40 m, and its diameter is 110 mm to 130 mm; The toilet paper. The weight per unit area of ​​each paper layer is 15.5 g / m². 2 ~20.0 g / m 2 Furthermore, by embossing, paper layers with concave portions on one side and convex portions corresponding to the concave portions on the other side are stacked with their convex surfaces facing each other, and are bonded together on the top of the convex portions with an adhesive. Furthermore, the degree of dissociation of the toilet paper is 500cc or more and 650cc or less, the ratio of longitudinal dry tensile strength to transverse dry tensile strength (i.e., longitudinal dry tensile strength / transverse dry tensile strength) is 2.9 or more and 3.8 or less, and the ratio of transverse wet tensile strength to transverse dry tensile strength (i.e., transverse wet tensile strength / transverse dry tensile strength) is 0.20 to 0.

40.

2. The toilet paper roll according to claim 1, wherein, When four sheets of the aforementioned toilet paper are overlapped and pressed into the testing terminal using a compression tester, the pressure drops from 0.5 gf / cm³. 2 Position under load: T0 to 50 gf / cm 2 The displacement (T0-Tm) between positions Tm under load is called extensibility, which is 1.0 mm or more.

3. The toilet paper roll according to claim 1 or 2, wherein the stacking configuration is a nested configuration in which the protrusion of one paper layer is located in the non-protrusion portion of another paper layer, and the two paper layers are bonded together by an adhesive applied to the protrusion of the paper layer located on the outer surface side of the roll.

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