Tissue paper storage body

Abstract

To provide a tissue paper storage body exhibiting "softness," "moist feeling," and "smoothness" even with a low basis weight.SOLUTION: There is provided a tissue paper storage body in which a bundle is stored in a storage box, the bundle being obtained by folding and stacking two-ply tissue paper as one set in a pop-up manner. The tissue paper contains moisturizing liquid. A basis weight of one ply of the tissue paper is 9.0 to 13.6 g / m2. A paper thickness of two ply is 100 to 130 μm. A total area of the tissue paper stored in the storage box is 9.0 to 10.8 m2 / storage box.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tissue container in which a stack of tissues is stored in a storage box. [Background technology]

[0002] Among dry tissues, tissues impregnated with medicinal liquids, known as moisturizing tissues or lotion tissues, are suitable for blowing noses and wiping the face. Moisturized tissue has a higher moisture content in the paper due to the hygroscopic action of the chemical solution, and is therefore softer, more moisturized, and smoother than tissue paper that does not have the chemical solution added.

[0003] Moisture-retaining tissue has a basis weight of 15 to 17 g / m 2 The mainstream was high-end products with high prices, but the basis weight was slightly lower at 14 g / m 2 General-purpose types with low product prices are also becoming popular.

[0004] For tissue paper storage units, especially general-purpose products and products in the popular price range, the basis weight is 10 to 11 g / m 2 The tissue paper contains non-moisturizing tissue paper to which no moisturizing solution has been added. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2019-150138 Summary of the Invention [Problem to be solved by the invention]

[0006] However, for consumers who regularly use conventional general-purpose moisturizing tissues, general-purpose products or non-moisturizing tissues in the popular price range can leave them dissatisfied in terms of "softness," "moisture" and "smoothness," especially when blowing their nose or wiping their face.

[0007] On the other hand, for consumers who regularly use general-purpose or affordable non-moisturizing tissue paper, even general-purpose moisturizing tissue paper may be perceived as excessive in quality or as being too expensive.

[0008] Therefore, moisturizing tissues with even lower basis weights than conventional general-purpose moisturizing tissues have been investigated, but they have the following problems.

[0009] In moisturized tissue, the moisture content is higher, so the strength is lower than that of base paper. If the basis weight of moisturized tissue is reduced too much, it becomes difficult to ensure the necessary strength. In addition, the fiber density becomes coarse, and the "smoothness" is reduced.

[0010] If the amount of moisturizing solution is reduced in order to ensure the necessary strength, it becomes difficult to fully feel the "softness" and "moist feeling" that the moisturizing solution provides. If too much is used, the "stickiness" increases.

[0011] For this reason, it has been difficult to establish the desired quality for low-basis weight moisturizing tissues, and it has been particularly difficult to produce moisturizing tissues with low basis weights that are satisfactory to consumers.

[0012] Therefore, a main object of the present invention is to provide a tissue paper container that contains moisturizing tissue of low basis weight, yet exhibits sufficient "softness," "moist feeling," and "smooth feeling." [Means for solving the problem]

[0013] The first solution to the above problem is A tissue paper container in which a bundle of two-ply tissue paper sheets is folded and stacked in a pop-up manner and stored in a storage box, The tissue paper contains a moisturizing liquid, The basis weight of one ply is 9.0 to 13.6 g / m 2 and The thickness of the two-ply paper is 100 to 130 μm. The total area of ​​tissue paper stored in the storage box is 9.0 to 10.8 m 2 / Storage box, The tissue paper container is characterized by the above.

[0014] The second method is The value of total sheet area / amount of moisturizing agent is 400~550m 2 / g.

[0015] The third method is The ratio of moisturizing solution volume to storage box volume is 0.015 to 0.030 g / cm 3 The tissue paper container according to the first aspect of the present invention is as follows:

[0016] The fourth method is In the paper tissue container according to the first aspect, the content of moisturizing liquid in the paper tissue is 16 to 24% by mass.

[0017] The fifth method is In the paper tissue container according to the first aspect, the Sdr of both surfaces of the paper tissue is 0.02 to 0.04.

[0018] The sixth method is In the paper tissue container according to the first aspect, the Sq (mm) of both sides of the paper tissue is 0.015 to 0.025. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a paper tissue container that is a moisturizing tissue of low basis weight, yet exhibits sufficient "softness," "moist feeling," and "smooth feeling." [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a perspective view of the tissue paper container. [Figure 2] FIG. 2 is a perspective view illustrating a tissue paper container. [Figure 3] FIG. 2 is a perspective view of the tissue paper container when in use. [Figure 4] FIG. 2 is a diagram illustrating the structure of a tissue paper stack. DETAILED DESCRIPTION OF THE INVENTION

[0021] The tissue paper container according to the present invention will be described in detail below with reference to Figures 1 to 4. It goes without saying that the tissue paper container according to the present invention is not limited to the following embodiments, and its configuration can be modified as appropriate within the scope of the matters described in this specification (including the claims and drawings).

[0022] The tissue container 1 according to this embodiment is a so-called pop-up type, in which a stack 2 of tissues, consisting of multiple tissues 2t, 2t... containing moisturizing liquid, folded and stacked, is stored in a storage box 10 having a perforation 20 for forming an outlet with a closed annular portion on the top surface 11, and when a tissue 2t is taken out from the outlet 20X formed by tearing the perforation 20 for forming the outlet during use, part of the adjacent underlying tissue 2t is exposed from the outlet 20X. In particular, when the total area of ​​the tissues in the storage box is 9.0 to 10.8 m2, 2 / It is used as a storage box.

[0023] [Storage box] The storage box 10 in which the stack 2 of tissue paper 2t is stored is a rectangular parallelepiped box also known as a carton box. This storage box 10 forms the exterior of the product, and as shown in Figures 1 and 2 which show the tissue paper container 1, it comprises a paper box with a circular take-out opening perforation 20 on the top surface 11, and a resin film 31 which covers the take-out opening forming portion 20a surrounded by the take-out opening perforation 20 from the inside of the paper box.

[0024] The paper box is a paper box body that forms the outer shell of the storage box 10, and its size, shape, opened shape, etc. are the same as those of the known paper box of the storage box 10. For example, in the form shown in Figures 1 and 2, the bottom surface (not shown) and one of the long side surfaces 13 are glued together inside the box via a glue tab to form a cylindrical shape, and then the top surface 11, the bottom surface, and the flaps F1, F2, and F3 extending from the long side surface 13 connecting them are folded back toward the inside of the box, and the abutting portions of the flaps F1, F2, and F3 are adhered with a hot melt adhesive or the like to form the short side surface 14. In the storage box 10 of this embodiment, the short side surface 14 is formed by folding back the flap F1 from the long side surface 13, folding back the flap F2 from the bottom surface 12 and overlapping it with the flap F1 from the long side surface 13, and then folding back the flap F3 from the top surface 11 and overlapping it with the flap F2 from the bottom surface 12. However, the storage box 10 is not limited to this structure.

[0025] As the material of the paper box constituting the storage box 10, for example, known paper materials whose main raw material is various pulps such as virgin pulp and recycled paper pulp can be used. Preferably, the material of the paper box has a basis weight of 250 to 500 g / m 2 , preferably 350 to 400 g / m 2 It is coated cardboard.

[0026] On the other hand, the perforations 20 for forming the access opening formed on the top surface 11 of the paper box that constitutes the storage box 10 are annular and formed using a known method and cut-tie ratio, and the specific shape of the area enclosed thereby is not necessarily limited. However, as shown in the example, the storage box 10 is typically a roughly oval or rectangular shape with the long side running along the longitudinal direction of the top surface of the paper box, and because this shape provides high accessibility and convenience, it is suitable for the present invention as well, as it can be produced on many existing manufacturing lines.

[0027] On the other hand, the resin film 31 is larger than the size of the outlet forming section 20a, for example, rectangular or oval, and is adhered to the inner surface of the top surface of the carton, particularly outside the outlet forming section 20a, so as not to affect the tearing and peeling of the outlet forming perforations 20. A suitable material for this resin film 31 is polyethylene film, but other examples include polypropylene and polyester.

[0028] The thickness of the resin film 31 is preferably 10 to 200 μm. If it is less than 10 μm, the strength is insufficient, and the probability of tearing or breaking when removing the tissue paper 2t increases. Conversely, if it is more than 200 μm, there is no problem with strength, but it becomes difficult to remove and costs increase.

[0029] A slit 30 is formed in the resin film 31, and this slit 30 is positioned in an area surrounded by the outlet-forming perforation 20. Therefore, as shown in Figures 1 and 2, by tearing open the outlet-forming perforation 20 and cutting and peeling off the outlet-forming portion 20a, an outlet 20X is formed in the top surface 11 of the storage box 10, and the resin film 31 and the slit 30 formed therein are exposed through the outlet 20X. The length of the slit 30 can be any length, and can be set to a length that is appropriate in relation to the size of the outlet 20X.

[0030] The tissues 2t stored as a stack 2 in the storage box 10 are taken out one by one from the outlet 20X through the slit 30. The slit 30 supports the part of the tissues 2t exposed from the outlet 20X, preventing them from falling into the storage box 10.

[0031] The size of the storage box is not limited, but examples include a storage box width (longer edge) L1 of 200 to 225 mm, a storage box depth (short edge) L2 of 95 to 120 mm, and a height L3 of 70 to 105 mm, as shown in Figure 1. The length of each part of the storage box is measured with a JIS Class 1 metal ruler. The average value of five points at each location is used. The volume of the storage box is calculated as L1 x L2 x L3.

[0032] [Stack of tissues] The bundle 2 of tissue paper 2t is a pop-type bundle formed by folding and stacking tissue paper 2t. More specifically, as shown in Fig. 4, square tissue paper 2t is essentially folded in half at a fold edge 2C, and the edges 2B of the folded pieces are positioned on the inner fold surfaces 2A of the adjacent tissue paper sheets above and below, and the tissue paper sheets are stacked in a staggered manner. Note that "substantially" here means that some folding of the edges formed during manufacturing is allowed.

[0033] As shown in Figures 3 and 4, when the topmost folded piece of tissue paper 2t in a stack 2 of stacked tissue paper 2t is pulled upward, the adjacent folded piece immediately below it is pulled upward due to friction and the like. The stack 2 of tissue paper 2t with this structure is stored with its top surface facing the top surface 11 of a storage box 10 having an outlet 20X in the top surface 11. When one sheet (the topmost sheet) is pulled out through the outlet 20X, particularly the slit 30, a portion of the other sheet located immediately below it is exposed. Note that pop-up stacks can be formed using a known interfolder. The interfolder may be a folding machine using folding plates, also known as a multi-stand type, stand type, or folding plate type, or a folding machine using a pair of folding rolls, also known as a rotary type. However, since low-basis-weight, low-thickness products require low cost, a folding machine using folding plates, which is suitable for high-volume, high-speed production, is desirable.

[0034] [Moisturizing liquid] The moisturizing solution is primarily composed of polyol. The moisture content of the moisturizing solution increases the moisture content of the tissue paper due to its hygroscopicity. Examples of polyols include glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, glucose, xylitol, maltose, maltitol, mannitol, and trehalose, with glycerin being preferred. 1,3-propanediol may be contained together with glycerin. 1,3-propanediol reduces stickiness and increases the smooth feel.

[0035] The polyol content in the moisturizing solution is 50% by mass or more, preferably 70% by mass or more, and more preferably 75 to 95% by mass. The moisturizing solution may contain one or more auxiliary agents that do not impair the effects of the present invention, such as inorganic and organic fine particle powders, oily components such as liquid paraffin, higher alcohols such as cetanol, stearyl alcohol, and oleyl alcohol, hydrophilic polymer gelling agents, moisturizing aids such as collagen, hydrolyzed collagen, hydrolyzed keratin, hydrolyzed silk, and hyaluronic acid, fragrances, extracts derived from various natural products, vitamins, emulsifiers, antifoaming agents, antifungal agents, deodorizers, and antioxidants.

[0036] [Tissue paper] In this embodiment, the tissue paper 2t constituting the bundle 2 and stored in the storage box 10 is a set of two plies of tissue paper. It is not embossed. With one ply or three or more plies, it is difficult to obtain the desired effects. This tissue paper contains a moisturizing liquid, and the basis weight of one ply is 9.0 to 13.6 g / m 2 The basis weight is preferably 10.0 to 13.4 g / m 2 , more preferably 11.5 to 12.9 g / m 2 The basis weight of conventional moisturizing tissue, which is relatively inexpensive and easy to use for general purposes, is 14 g / m 2 This is about 9.0 to 13.6 g / m 2 Basis weight is lower than that. If the basis weight is too low, it becomes difficult to ensure sufficient strength. Basis weight is measured as the basis weight per ply in accordance with JIS P 8124 (2011).

[0037] The paper thickness for a two-ply sheet is 100 to 130 μm. A thickness of 105 to 125 μm is desirable, with 110 to 120 μm being particularly desirable. Conventional moisturizing tissues, which are relatively inexpensive and easy to use for general purposes, have a paper thickness of around 150 μm, and this value of 100 to 130 μm is thinner than this. The same can be said for basis weight. If the paper thickness is too thin, it becomes difficult to ensure sufficient strength. This paper thickness was measured under the same conditions as in JIS P 8111 (1998), after thoroughly conditioning a two-ply test piece with the moisture content. A dial thickness gauge (thickness measuring device) called "PEACOCK G Type" (manufactured by Ozaki Seisakusho) was used to measure the thickness. Specifically, after making sure there is no dirt or dust between the plunger and the measuring table, lower the plunger onto the measuring table, move the scale on the dial thickness gauge to set the zero point, then raise the plunger, place the test piece on the measuring table, and slowly lower the plunger at a speed of 1 mm / sec or less, reading the gauge at that time. When measuring, be careful to ensure that the metal plunger terminal (a circular flat surface with a diameter of 10 mm) is in contact with the paper surface perpendicularly. The measured paper thickness is the average value obtained by performing 10 measurements.

[0038] The present invention can provide sufficient "softness," "moist feeling," and "smooth feeling" even with this low basis weight and thin paper thickness. (Note that in tables and formulas, this is sometimes referred to as the total sheet area.) 9.0~10.8m 2 / This is because it is a storage box. The total area of ​​the tissue paper according to this invention is the total area of ​​one side of the tissue paper, either the front or back. In other words, it is calculated by multiplying the area of ​​one side of one tissue paper sheet (one set) by the number of sets. The area of ​​one side of one tissue paper sheet is calculated by measuring the length and width of one tissue paper sheet with a JIS Class 1 metal ruler and multiplying the length by the width. The area is also calculated as the average value of five arbitrary tissue paper sheets excluding the top and bottom. Folds caused by pop-up are measured by smoothing them out so as not to stretch the paper.

[0039] Until now, the "softness," "moisture," and "smoothness" of tissue paper, especially moisturizing tissue, have only been considered in relation to the thickness and basis weight of each individual sheet, and no consideration has been given to their relationship with the entire container, particularly the storage box and stack. However, with conventional general-purpose moisturizing tissue, the total area of ​​tissue paper stored in the storage box is 7.0 to 8.0 m. 2 This is because the design was based on the size of a typical conventional storage box, sheet dimensions, and the number of sheets in a stack.

[0040] In this embodiment, the total area of ​​the tissue paper is 9.0 to 10.8 m 2 The storage box and total surface area are larger. In a pop-up type bundle, tissue papers are stacked to form a bundle. Therefore, if the total surface area of ​​tissue papers in the storage box increases, the amount of fiber and moisturizing solution in the storage box also increases, and it is presumed that the moisture-absorbing effect of the moisturizing solution is fully expressed in the entire bundle. Furthermore, since tissue papers are generally used immediately after being taken out of the storage box, it is presumed that the moisturizing effect in the bundle state is sufficient to evaluate the sensory aspect during use.

[0041] In a preferred embodiment, in the above-mentioned basis weight and paper thickness, the value of the total sheet area / amount of moisturizing liquid is 400 to 550 m2, both in terms of the total area of ​​the tissue paper and in terms of the tissue paper alone. 2 / g. Within this range, the area of ​​the chemical solution per unit exposed to the air during use becomes appropriate, and the effect as a moisturizing tissue increases. In other words, if the value of total sheet area / amount of moisturizing solution is too low, the unit amount of chemical solution will be present in a narrow area of ​​the sheet, making it easy to feel sticky. Conversely, if the value of total sheet area / amount of moisturizing solution is too high, the unit amount of chemical solution will be present in a wide area, making it difficult to feel sufficient moisturizing. Even with a low basis weight and thin paper thickness, sufficient "softness," "moist feeling," and "smooth feeling" can be exhibited if the value is within the above range. Preferably, the value of total sheet area / amount of moisturizing solution is 450 to 500 m 2 / g.

[0042] The amount of humectant solution here refers to the total amount of humectant solution contained in a bundle, calculated based on the amount of humectant solution contained in tissue paper conditioned under the standard conditions of 23°C and 50% RH as specified in JIS P8111. Specifically, it is measured as follows. First, the basis weight per ply of tissue paper containing humectant solution is measured in accordance with JIS P 8124 (2011). Next, also in accordance with JIS P 8124 (2011), the basis weight per ply of two plies of tissue paper containing no humectant solution but made from the same or equivalent base paper as the base paper of the tissue paper containing humectant solution is measured. Next, the amount of humectant solution is calculated by subtracting the basis weight of the tissue paper (one ply) without humectant solution from the basis weight of the tissue paper (one ply) containing humectant solution. Next, this amount of humectant solution is multiplied by the total sheet area to convert to a two-ply equivalent amount of humectant solution. That is, the amount of moisturizing solution is calculated by ((basis weight of one ply of tissue paper containing moisturizing solution) - (basis weight of one ply of tissue paper without moisturizing solution)) x 2 (number of plies) x (total sheet area).

[0043] In a preferred aspect of the embodiment, in the above-mentioned basis weight and paper thickness, the value of the moisturizing solution amount / container box volume is 0.015 to 0.030 g / cm along with at least one of the values ​​of the total area of ​​the tissue paper and the total area of ​​the sheet / the value of the moisturizing solution amount, or as a single form. 3 This is considered to be the same as the total area of ​​tissue paper stored in the storage box, or the ratio of total sheet area to the amount of moisturizing solution. For tissue paper with a low basis weight and thin thickness, it is best to consider the tissue paper in the storage box as a whole. In particular, for tissue paper storage bodies, the volume of the storage box is considered to be almost the same as the volume inside the storage box. In other words, the value of moisturizing solution amount / storage box volume can also be considered as the ratio of the amount of moisturizing solution inside the storage box. If it is within the above range, there will be enough moisturizing solution inside the storage box, and even with a low basis weight and thin paper thickness, "softness," "moist feeling," and "smooth feeling" can be exhibited. A more preferable value for moisturizing solution amount / storage box volume is 0.017 to 0.024 g / cm 3 is.

[0044] The moisturizing liquid content of the tissue paper is preferably 16 to 24% by mass. If it is 16 to 24% by mass, the tissue paper can exhibit "softness," "moist feeling," and "smooth feeling."

[0045] In the tissue container of the embodiment, the total area of ​​the tissues stored in the storage box, the ratio of total sheet area to the amount of moisturizing solution, and the amount of moisturizing solution to the volume of the storage box are adjusted based on the number of sets of tissues constituting the stack, the size of the storage box, the size of the tissues, etc. Regarding these adjustments, in conventional moisturizing tissue products, the dimensions of the tissues are 200-205 mm (length) x 205-225 mm (width), and the number of sets is 180-200. In the case of low basis weight and low thickness tissue of the embodiment, it is particularly desirable that the dimensions of the tissues are 202-208 mm (length) x 188-196 mm (width), and the number of sets is 220 sets or more, preferably 230 sets or more. However, with regard to the dimensions of the tissues, the area of ​​one tissue sheet is 0.041 m 2 Below, especially 0.040m 2 It is desirable to keep it below this level.

[0046] In other words, in this embodiment, it is preferable to make the width of the tissue paper smaller and to increase the number of sets compared to conventional products. A stack of these dimensions and number of sets will have a smaller top surface area (bottom surface area) than the above-mentioned conventional moisturizing tissues. By increasing the number of sets that can be stored in a storage box, the total area of ​​the tissue paper and the value of total sheet area / amount of moisturizing solution can be ensured, and by reducing the top surface area (bottom surface area), it becomes more difficult for the moisturizing solution in the tissue paper to evaporate. Note that while an increase in the number of sets increases the height of the stack, this increase is small for low basis weights and low paper thicknesses. Furthermore, an increase in the number of sets increases the number of layers, which suppresses evaporation of the moisturizing solution.

[0047] Furthermore, the value of the amount of moisturizing solution / volume of the storage box can be adjusted by making the shape of the storage box more compact depending on the preferred embodiment of the dimensions and number of sets of tissue paper 2t. The size of the storage box 10 is not limited, but it is desirable that it is larger than the stack 2 of tissue paper 2t and that the inner diameter is within the range of 1 to 25 mm larger than the outer diameter of the stack 2.

[0048] In addition, with regard to the relationship between the bundle and the storage box, the ratio of the height of the storage box to the height of the bundle is preferably less than 100%, more preferably 80 to 90%, and particularly preferably 83 to 88%. By ensuring that the top surface of the bundle and the top surface of the storage box do not come into contact with each other and that the distance between them is not too great, the moisturizing solution is more easily retained in the bundle. The bundle height here is determined by placing the bundle on a horizontal stand, measuring the height of a square with a JIS Class 1 metal ruler, and taking the average value of the squares.

[0049] In a preferred embodiment, at the above basis weight and paper thickness, the total amount of moisturizing solution in the storage box is set to 35 to 60 g / storage box, preferably 38 to 50 g / storage box, and particularly preferably 40 to 46 g / storage box, along with at least one of the values ​​of total area of ​​tissue paper, total sheet area / amount of moisturizing solution, and amount of moisturizing solution / volume of storage box, or alone. Having a sufficient amount of moisturizing solution in the storage box allows the moisture-absorbing effect to be fully exerted. This can be adjusted by the moisturizing solution content of the tissue paper, storage box, and the bundle.

[0050] The size of the storage box is not limited, but examples include a storage box width (longer edge) L1 of 200 to 225 mm, a storage box depth (short edge) L2 of 95 to 120 mm, and a height L3 of 70 to 105 mm, as shown in Figure 1. The length of each part of the storage box is measured with a JIS Class 1 metal ruler. The length is the average of five points at each location. The volume of the storage box is calculated as L1 x L2 x L3.

[0051] It is said that reducing the basis weight of moisturized tissue makes it difficult to ensure the necessary strength and reduces the fiber density, resulting in a decrease in "smoothness." This decrease in strength can be addressed by increasing the wet strength agent. Increasing the content of wet strength agent increases strength, resulting in a stiffer feel. However, low-basis-weight, thin tissue paper is inherently weak in stiffness even without the inclusion of a moisturizing agent, so the impact of increasing the wet strength agent on the perceived stiffness is small. Therefore, at least within the basis weight and paper thickness ranges according to the present invention, the lack of strength can be compensated for by the wet strength agent. Furthermore, the inventors have discovered that increasing the amount of wet strength agent improves the adhesion of the wet paper to the dryer, particularly during the production of low-basis-weight base paper, thereby enabling the tissue paper's surface properties to be creped to achieve more sufficient qualities of "softness" and "smoothness."

[0052] The wet tensile strength of the moisturizing tissue of the present embodiment is not necessarily limited, but may be adjusted to 30 to 40 cN / 25 mm, preferably 35 to 45 cN / 25 mm, in the transverse direction, which is considered to be the weakest. The wet tensile strength here is a value measured in accordance with JIS P 8135 (1998) and is measured as follows. Test specimens are used that are cut to a width of approximately 25 mm (±0.5 mm) and a length of approximately 150 mm in both the longitudinal and transverse directions. Measurements are performed on multiple plies as they are. The tester used is a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd., or an equivalent machine. The grip spacing is set to 100 mm, and the pulling speed is set to 50 mm / min. After clamping both ends of the test piece in the grips of the testing machine, water is applied horizontally to the center of the test piece in a width of about 10 mm using a water-soaked flat brush, and then a tensile load is immediately applied to the paper in the vertical direction, and the reading (digital value) is read when the paper breaks. Five sets of samples are prepared in both the vertical and horizontal directions, and measurements are taken five times each, with the average of these measurements being the wet tensile strength in each direction.

[0053] Regarding the preferable surface properties of the tissue paper, it is particularly preferable that Sdr on both outer surfaces of the two-ply sheet is 0.02 to 0.04.

[0054] [Sdr] ISO 25178 Surface Quality (Surface Roughness Measurement) is based on the international standard that defines the method for evaluating surface roughness. It expresses the increase in the developed area (surface area) of a defined region relative to the area of ​​the defined region. In this embodiment, the addition of a wet strength agent improves the adhesion of the base paper to the dryer, and the crepe ratio is set to a range of 13-17%. The shape of the creping doctor blade and the release properties from the dryer using a release agent, etc., are adjusted to achieve a surface quality that feels soft and smooth. Three-dimensional image data was measured using the VR-3200 One-Shot 3D Shape Measuring Instrument and image analysis was performed using the VR-3200 analysis application. Sdr, calculated as the developed area ratio of the interface, is expressed as "(area including irregularities) / (apparent area)-1." The difference between the (area including irregularities) and the (apparent area) is presumed to be primarily due to creping on the sheet surface. In the embodiment, when Sdr is in the range of 0.02 to 0.04, the unevenness is moderate, and the area where the finger touches does not feel excessively cushioned, resulting in a flat feel, which makes it easy to feel "smooth" and makes it difficult to feel unreliable.

[0055] [Method of measuring Sdr using the one-shot 3D shape measuring instrument VR-3200] The tissue is cut to a measurable size, and the 3D image data of the surface of the sheet is measured. After performing surface shape correction using image processing (waviness removal, correction strength "20"), the reference surface setting is selected and the area to be measured is set using the optional area setting. The measurement parameter "composite parameter Sdr" is applied. 3D image data analysis is performed within the measurement area for the set Sdr. For surface roughness measurement, the image analysis area is set within a 10mm x 10mm square range, and image analysis is performed to determine Sdr. Measurements are performed by capturing 3D image data at five locations per sheet, and image analysis is performed. These measurements are performed with N=5, and Sdr is calculated from the average value.

[0056] As for the preferable surface properties of this tissue paper, it is particularly preferable that the Sq (mm) of both outer surfaces of the two-ply sheet is 0.015 (mm) to 0.025 (mm).

[0057] [Sq(mm)] ISO 25178 Surface Texture (Surface Roughness Measurement) is based on an international standard that defines methods for evaluating surface roughness. Specifically, it indicates the root-mean-square height (Sq), which corresponds to the standard deviation of the distance from the mean surface. In this embodiment, the addition of a wet strength agent improves the adhesion of the base paper to the dryer, and the crepe ratio is set to a range of 13-17%. The shape of the creping doctor blade and the release agent, etc., are adjusted to achieve a soft, smooth surface. Sq (mm), calculated by measuring 3D image data using the VR-3200 One-Shot 3D Shape Measuring Instrument and performing image analysis using the VR-3200 analysis application, corresponds to the standard deviation of height. A large value indicates a sense of unevenness on the surface when touching the sheet. A small value indicates a sense of flatness and hardness when touching the sheet. A large Sq indicates that the convex and concave portions of the sheet feel uneven, while a small Sq indicates that there is no unevenness and the sheet feels flat when touched by a finger. In the embodiment, when Sq (mm) is 0.015 (mm) to 0.025 (mm), the unevenness is hardly felt, and the hardness is hardly felt in relation to the moisturizing liquid.

[0058] [Method for measuring Sq using the one-shot 3D shape measuring instrument VR-3200] The tissue is cut to a measurable size, and the 3D image data of the surface of the sheet is measured. After performing surface shape correction using image processing (removing waviness, correction strength "20"), the reference plane setting is selected and the area to be measured is set using the arbitrary area setting. The measurement parameter is "height parameter Sq (mm)". 3D image data analysis is performed within the measurement area of ​​the set Sq (mm). For surface roughness measurement, the image analysis area is set within a 10mm x 10mm square range, and image analysis is performed to determine Sq (mm). Measurements are performed by capturing 3D image data at five locations per sheet, and image analysis is performed. These measurements are performed with N=5, and Sq (mm) is calculated from the average value.

[0059] Furthermore, with regard to the preferable surface properties of this tissue paper, the [Spd(1 / mm 2 )] is 7.5 to 12.0 (1 / mm 2 ) is preferable, and 9.8 to 11.5 (1 / mm 2 ) is particularly preferred.

[0060] [Spd(1 / mm 2 )] Spd(1 / mm 2 ) is based on the definition of surface shape in ISO25718. In this embodiment, the addition of a wet strength agent improves the adhesion of the base paper to the dryer, the crepe ratio is set to a range of 15-19%, and the shape of the creping doctor blade and the release properties from the dryer using a release agent, etc. are adjusted to create a surface paper quality that feels soft and smooth. Three-dimensional image data was measured using the one-shot 3D shape measuring instrument VR-3200, and image analysis was performed using the analysis application VR-3200 to determine Spd (1 / mm 2 ) indicates the "peak density" and 1mm 2 Number of vertices per square (1 / mm 2 The larger the value of [Spd(1 / mm ], the closer the peaks are arranged, and the smoother the feel. The peaks are assumed to be the peaks formed by crepe or the like on the surface of the sheet. In the embodiment, the [Spd(1 / mm ] of both outer surfaces of the two-ply sheet 2 )] is 7.5 to 12.0 (1 / mm2 ) you will feel smoother.

[0061] [Method of measuring Spd using the one-shot 3D shape measuring instrument VR-3200] The tissue was cut into a measurable size, and the 3D image data of the surface of the sheet was measured. After performing surface shape correction (removing waviness, correction strength "20") using image processing, the reference plane setting was selected, and the area to be measured was set using the arbitrary setting of the area setting. The measurement parameters were the "shape parameter Spd (1 / mm 2 )" is applied. 2 ) measurement area, and perform 3D image data analysis. For surface roughness measurement, set the image analysis area within a 10mm x 10mm square range and perform image analysis to obtain Spd (1 / mm 2 ) was calculated. Measurements were performed by taking 3D image data at five locations per sheet, and image analysis was performed. These measurements were performed with N = 5, and Spd (1 / mm 2 ) is calculated.

[0062] Furthermore, regarding the preferable surface properties of this tissue paper, Spc (1 / mm) is preferably 3.0 (1 / mm) to 4.5 (1 / mm), and particularly preferably 3.6 (1 / mm) to 4.3 (1 / mm).

[0063] [Spc(1 / mm)] This is based on ISO 25178, an international standard that defines methods for evaluating surface roughness. In this embodiment, the addition of a wet strength agent improves the adhesion of the base paper to the dryer, while the crepe ratio is set to a range of 13-17%. The shape of the creping doctor blade and the release properties from the dryer using a release agent, etc., are adjusted to achieve a soft, smooth surface. Spc (1 / mm), calculated by measuring 3D image data using the VR-3200 One-Shot 3D Shape Measuring Instrument and performing image analysis using the VR-3200 analysis application, indicates the average principal curvature of the apex of the convex shape of the surface. A small Spc (1 / mm) value indicates a rounded point of contact with other objects, resulting in a greater resistance felt by the finger. A large Spc (1 / mm) value indicates a sharp point of contact with other objects, resulting in a lesser resistance felt by the finger. The apex of the convex shape of the surface is assumed to be the peak formed by creping or other factors on the sheet surface. In this embodiment, it is particularly preferable that Spc (1 / mm) is 3.0 (1 / mm) to 4.5 (1 / mm), as this provides a smooth surface feel.

[0064] [Method of measuring Spc using the one-shot 3D shape measuring instrument VR-3200] The tissue was cut into a measurable size, and the 3D image data of the surface of the sheet was measured. After performing surface shape correction using image processing (removing waviness, correction strength "20"), the reference plane setting was selected and the area to be measured was set using the arbitrary area setting. The measurement parameter applied was "shape parameter Spc (1 / mm)." 3D image data analysis was performed within the measurement area of ​​the set Spc (1 / mm). For surface roughness measurement, the image analysis area was set within a 10mm x 10mm square range, and image analysis was performed to determine Spc (1 / mm). Measurements were performed by capturing 3D image data at five locations per sheet, and image analysis was performed. These measurements were performed with N = 5, and Spc (1 / mm) was calculated from the average value.

[0065] On the other hand, the pulp fibers in the tissue paper of the embodiment are not particularly limited, but are 90 to 100% by mass of virgin pulp and 0 to 10% by mass of recycled paper pulp, and preferably 100% by mass of virgin pulp. In particular, the virgin pulp is preferably softwood kraft pulp (NBKP) and hardwood kraft pulp (LBKP). The blending ratio of these is preferably NBKP:LBKP 20:80 to 49:51. In particular, the blending ratio of NBKP:LBKP 25:75 to 28:72 is desirable. A high blending ratio of LBKP tends to improve the qualities of "softness" and "smoothness."

[0066] The effects of the tissue paper according to the present invention will be further described below with reference to examples and comparative examples of tissue paper containers. [Example]

[0067] The tissue paper in each example is a commercially available general-purpose moisturizing tissue paper container in Comparative Example 1, a commercially available high-priced, high-end general-purpose moisturizing tissue paper container in Comparative Examples 2 and 3, and a commercially available, non-moisturizing, popular tissue paper container in Comparative Example 4. The measured values ​​of the tissue paper in each example, the configuration of the container, etc. are as shown in Table 1 below.

[0068] In addition, a tissue paper sensory evaluation test was conducted on Example 3, Comparative Example 1, which is a commercially available general-purpose moisturizing tissue paper container, and Comparative Example 4, which is a commercially available non-moisturizing popular tissue paper container. The test was conducted by 25 people, and the average value was used as the evaluation score. The results are shown in Table 2.

[0069] In the sensory evaluation test, subjects were asked to actually use the tissue paper of each example and evaluate its "moist feeling," "softness," and "smoothness." The evaluation was performed using absolute scores, with scores being assigned as follows: very good (7 points), good (6 points), somewhat good (5 points), neutral (4 points), somewhat poor (3 points), poor (2 points), and very poor (1 point), and the average score was calculated.

[0070] [Table 1] [Table 2]

[0071] According to the results in Table 1, when looking at the structure of the tissue paper container, the embodiment is Total sheet area ( Total area of ​​tissue paper stored in the storage box ) " is close to the "luxury type" comparative examples 2 and 3. Also, the value of "total sheet area / amount of moisturizing agent" is close to the luxury type comparative example 3 and higher than the luxury type comparative example 2. Furthermore, the "amount of moisturizing agent / storage box" is between the luxury type comparative examples 2 and 3. Furthermore, according to the results in Table 2, in the sensory evaluation, the Examples were rated superior to non-moisturizing commercial products and almost equivalent to general-purpose types.

[0072] From these findings, by designing the relationship between the specific bundle and storage box according to the present invention to be similar to that of a high-end type, rather than the quality of a single sheet of tissue, sufficient quality can be obtained even with a low basis weight and paper thickness. In particular, this quality will not dissatisfy consumers who use conventional, general-purpose moisturizing tissues on a daily basis, and even consumers who use non-moisturizing tissues in the popular price range will not feel that the quality is excessive, and it is possible to increase the number of sets, making it difficult to feel that the product price is high.

[0073] Furthermore, with regard to the surface properties of the tissue paper itself, the Spd and Spc values ​​of the Examples suggest that the surface tends to be less uneven than that of the Comparative Examples. It can be seen that the crepe is stretched and smooth at low basis weights. On the other hand, it is presumed that the loss of cushioning properties due to the stretching of the crepe is offset by the lack of stiffness, so the perceived "softness" is not reduced.

[0074] As described above, the tissue paper container of the present invention is able to ensure sufficient quality in terms of "moistness," "softness," and "smoothness" even with a low basis weight and paper thickness, thanks to the configuration of the stack and the entire container. [Industrial Applicability]

[0075] The tissue paper of the present invention can be used for home use as well as for commercial use (for example, in airport toilets used by an unspecified number of people, hospitals, etc.). [Explanation of symbols]

[0076] 1...tissue paper container, 2...tissue paper stack, 2t...tissue paper, 2A...inner surface of folded-up piece, 2B...edge of folded-up piece, 2C...folded edge, 10...storage box, 11...top surface, 12...bottom surface, 13...long side surface, 14...short side surface, 20...perforation for forming outlet, 20a... outlet forming portion, 20X... outlet, 31... resin film, 30 slit, F1~F3...flaps, L1...storage box width, L2...storage box depth, L3...storage box height.

Claims

1. A tissue paper container in which a set of two plies of tissue paper is folded and stacked in a pop-up manner and stored in a storage box, The tissue paper contains a moisturizing liquid. The basis weight of one ply is 9.0 to 13.6 g / m 2 and The thickness of the two-ply paper is 100 to 130 μm. The total area of ​​tissue paper stored in the storage box is 9.0 to 10.8 m 2 / It is a storage box, A tissue paper container characterized by the above.

2. The value of total sheet area / amount of moisturizing agent is 400-550m 2 The tissue paper container according to claim 1, wherein the elastic modulus is 1 / g.

3. The value of the moisturizing agent amount / storage box volume is 0.015 to 0.030 g / cm 3 The tissue paper container according to claim 1,

4. The tissue paper container according to claim 1, wherein the tissue paper has a moisturizing liquid content of 16 to 24% by mass.

5. The tissue paper container according to claim 1, wherein the Sdr of both surfaces of the tissue paper is 0.02 to 0.

04.

6. The tissue paper container according to claim 1, wherein the Sq (mm) of both sides of the tissue paper is 0.015 to 0.025.

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