Storage box containing sanitary tissue paper

Abstract

To provide a storage box containing sanitary tissue paper that can be manufactured by a multi-stand type interfolder, is compact, makes it easy to take out first several sheets of sanitary tissue paper, is less likely to cause the tissue paper to be torn when it is taken out, and does not impair a touch feeling.SOLUTION: There is provided a storage box containing sanitary tissue paper 10 for storing, in a storage box 30, a stack of sanitary tissue paper 20 that can be taken out in a pop-up manner, where a pull-out direction of the sanitary tissue paper 20 is a CD direction, the number of sets of sanitary tissue paper 20 is 220 or more and 300 or less, and a height of the storage box 30 is 44 mm or more and 80 mm or less. A formation index of one sheet of sanitary tissue paper 20 measured by a β-ray formation analyzer is 2.2 or less, a tensile strength in the pull-out direction of the sanitary tissue paper 20 when it is dried is 0.7 N / 25 mm or more and 2.5 N / 25 mm or less, and the density inside the storage box expressed by the formula: (number of sets of sanitary tissue paper (sets)) / (height of storage box (mm)) is 3.5 or more and 5.0 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to sanitary tissue storage boxes. [Background technology]

[0002] Household sanitary thin paper such as tissue paper and toilet paper is becoming increasingly polarized between premium (high quality) and large-volume products. The challenge with large-volume products is how to make them compact without making them too large, even when the volume is increased.

[0003] Patent Document 1 discloses a technology for obtaining compact boxed tissues by reducing the height of the storage box per number of tissues stored without compromising the quality of the tissue paper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-286414 A Summary of the Invention [Problem to be solved by the invention]

[0005] For example, by reducing the basis weight of each tissue sheet to reduce its thickness, it is possible to make the tissue more compact and increase the number of sets, but if the basis weight is too low, the tissue will have poor texture and may tear easily when pulled out.On the other hand, if the basis weight is too high, the tissue will be too thick when stacked, making it difficult to pull out the tissue when removed and may tear.

[0006] In addition, tissues produced by rotary interfolders have a problem that the tissues are pulled out in the MD (machine direction), which prevents them from tearing when pulled out, but they are less productive and have a higher thickness when stacked. On the other hand, tissues produced by multi-stand interfolders have a superior productivity and can keep the thickness low when stacked, but the tissues are pulled out in the CD (cross direction), which reduces the strength in the pull-out direction and may lead to tearing when pulled out. Furthermore, there is also the problem that it is difficult to use the equipment to produce large volumes of tissues, exceeding 220 sets, with multi-stand interfolders.

[0007] For the reasons mentioned above, with conventional large-capacity tissues, it has been difficult to satisfy all of the requirements for large capacity, product size, and ease of taking out the tissues (resistance to tearing).

[0008] In the tissue paper product described in Patent Document 1, the number of tissues that can be stored is limited in order to reduce the height of the storage box.

[0009] Therefore, the present disclosure aims to provide a storage box containing sanitary tissue paper that can be manufactured using a multi-stand type interfolder, is compact, makes it easy to remove the first few sheets, is less likely to tear when removed, and does not impair the feel of the paper. [Means for solving the problem]

[0010] In order to solve the above problems, a first aspect of the present invention is a storage box containing sanitary tissue paper, the storage box having an outlet through which the sanitary tissue paper can be removed, and a stack of the sanitary tissue paper that can be removed in a pop-up manner is stored inside the storage box, wherein the pull-out direction of the sanitary tissue paper is the CD direction of the sanitary tissue paper, the number of sets of the sanitary tissue paper is 220 sets or more and 300 sets or less, the height of the storage box is 44 mm or more and 80 mm or less, the formation index of one sheet of the sanitary tissue paper measured by a beta-ray ground sum is 2.2 or less, the tensile strength of the sanitary tissue paper in the pull-out direction when dry is 0.7 N / 25 mm or more and 2.5 N / 25 mm or less, and the density inside the storage box, expressed by the formula: (number of sets of the sanitary tissue paper (sets)) / (height of the storage box (mm)), is 3.5 or more and 5.0 or less.

[0011] A second aspect of the present invention is a storage box containing sanitary thin paper according to the first aspect, wherein the basis weight of one ply of the sanitary thin paper is 9 g / m 2 More than 15g / m 2 The following is the result.

[0012] A third aspect of the present invention is a storage box containing sanitary tissue paper of the first aspect or the second aspect, wherein a film is provided at the outlet of the storage box, and the ratio of the weight of the film to the total weight of the storage box containing sanitary tissue paper is 0.2% or more and 5.0% or less.

[0013] A fourth aspect of the present invention is a storage box containing sanitary thin paper of the first aspect or the second aspect, wherein the thickness of the sanitary thin paper is 0.38 mm / 10 ply or more and 0.75 mm / 10 ply or less.

[0014] A fifth aspect of the present invention is a storage box containing sanitary tissue paper according to the first aspect or the second aspect, wherein the slit length of the outlet of the storage box is 140 mm or more and 190 mm or less.

[0015] A sixth aspect of the present invention is a storage box containing sanitary tissue paper of the first aspect or the second aspect, wherein the value represented by the formula: (length (mm) in a direction intersecting the direction in which the sanitary tissue paper is pulled out) / (slit length (mm) of the outlet of the storage box) is 1.05 or more and 1.55 or less.

[0016] A seventh aspect of the present invention is a storage box containing sanitary thin paper according to the first aspect or the second aspect, wherein a tissue softness measuring device (TSA) is used to press a bladed rotor onto a sample of the sanitary thin paper placed on a sample stage with a pressing pressure of 100 mN from above, and then rotate the sample stage at a rotation speed of 2.0 ( / sec). When the vibration of the sample stage is measured with a vibration sensor, the intensity (TS750) of the maximum peak of the first spectrum from the low frequency side, which is automatically obtained by software on the TSA, is 6.5 dBV. 2 RMS above 11.0dBV 2 rms or less, and the intensity of the maximum peak in the spectrum containing 6500Hz (TS7) is 11.0dBV 2 RMS over 15.5dBV 2 is less than rms.

[0017] An eighth aspect of the present invention is a storage box containing sanitary tissue paper of the first aspect or the second aspect, wherein the tensile strength of the sanitary tissue paper in a direction crossing the direction in which it is pulled out when dry is 3 N / 25 mm or more and 6 N / 25 mm or less.

[0018] A ninth aspect of the present invention is a storage box containing sanitary tissue paper according to the first aspect or the second aspect, wherein the sanitary tissue paper has a surface area of ​​0.05 mm per 45 mm x 45 mm. 2 The number of pinholes below is between 1 and 200. Effect of the Invention

[0019] According to the present disclosure, it is possible to provide a storage box containing sanitary tissue paper that can be manufactured using a multi-stand type interfolder, is compact, makes it easy to remove the first few sheets, is less likely to tear when removed, and does not impair the feel of the paper. [Brief description of the drawings]

[0020] [Figure 1] 1 is an external perspective view of a storage box containing sanitary tissue paper according to one embodiment of the present invention. FIG. [Diagram 2] 4 is a cross-sectional view showing the state in which the sanitary thin paper is being pulled out from the outlet. FIG. [Diagram 3] 1 is a schematic diagram showing the configuration of a folding section of a multi-stand type interfolder. FIG. [Figure 4] 4 is a schematic perspective view of a folding plate device constituting the folding section shown in FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] Fig. 1 is an external perspective view of a storage box containing sanitary tissue paper according to one embodiment of the present invention. Fig. 2 is a cross-sectional view showing the state in which the sanitary tissue paper is being pulled out from the outlet. Note that the X direction in the figure indicates the longitudinal direction of the storage box 30, the Y direction in the figure indicates the lateral direction of the storage box 30, and the Z direction in the figure indicates the height direction of the storage box 30.

[0023] [Hygienic tissue paper storage box] 1 and 2, a storage box 10 containing sanitary thin paper of the present invention stores a stack 3 of sanitary thin paper 20 that can be removed in a pop-up manner inside a storage box 30 having an outlet 31 through which the sanitary thin paper 20 can be removed. The sanitary thin paper 20 is stored in the storage box 30, for example, folded at fold line 21, as shown in FIG.

[0024] 2, which is along the cross direction (CD) of the sanitary thin paper 20. The direction intersecting the direction in which the sanitary thin paper 20 is pulled out corresponds to the longitudinal direction (X direction) of the storage box 30, which is along the machine direction (MD) of the sanitary thin paper 20.

[0025] [Storage box] The storage box 30 in the sanitary tissue paper-containing storage box 10 of the present invention is a rectangular parallelepiped made of paper and has an outlet 31 on the top surface through which the sanitary tissue paper 20 can be removed.

[0026] (slit) The outlet 31 is provided with a film 32. The film 32 is formed with a slit 33 extending in the longitudinal direction (X direction). The length LS of the slit 33 of the outlet 31 (hereinafter referred to as the "slit length LS") is preferably 140 mm or more and 190 mm or less. If the slit length LS is shorter than 140 mm, the sanitary thin paper 20 will get caught in the slit 33 when taken out, making it difficult to take out and easy to tear. On the other hand, if the slit length LS is longer than 190 mm, the sanitary thin paper 20 will easily fall into the storage box 30 (hereinafter referred to as the "drop back phenomenon"). The lower limit of the range of the slit length LS is more preferably 145 mm or more, and more preferably 152 mm or more. The upper limit of the range of the slit length LS is more preferably 175 mm or less, and more preferably 164 mm or less.

[0027] (Storage box dimensions) The length LC of the storage box 30 in the longitudinal direction (X direction) is preferably 200 mm or more and 260 mm or less, more preferably 210 mm or more and 250 mm or less, and even more preferably 220 mm or more and 240 mm or less.

[0028] Furthermore, the length WC of the storage box 30 in the short side direction (Y direction) is preferably 90 mm or more and 130 mm or less, more preferably 95 mm or more and 125 mm or less, and even more preferably 100 mm or more and 120 mm or less.

[0029] Moreover, the height HC (length in the Z direction) of the storage box 30 is 44 mm or more and 80 mm or less. If the height HC of the storage box 30 is lower than 44 mm, the density of the sanitary thin paper 20 in the storage box 30 (hereinafter referred to as "density inside the storage box") described later becomes too high, and the sanitary thin paper 20 becomes easily torn when the sanitary thin paper 20 is taken out. On the other hand, if the height HC of the storage box 30 is higher than 80 mm, the sanitary thin paper 20 becomes difficult to pick up and the drop back phenomenon is likely to occur. The lower limit of the range of the height HC of the storage box 30 is preferably 55 mm or more, and more preferably 58 mm or more. The upper limit of the range of the height HC of the storage box 30 is preferably 72 mm or less, and more preferably 66 mm or less.

[0030] (Percentage of film weight) The ratio of the weight of the film 32 to the total weight of the sanitary thin paper-containing storage box 10, represented by the following formula (1) (hereinafter simply referred to as "the ratio of the weight of the film 32"), is preferably 0.2% or more and 5.0% or less. (Weight of film) / (Total weight of storage box containing sanitary tissue paper) x 100...(1) If the weight ratio of film 32 is less than 0.2%, it will be impossible to provide film 32 at outlet 31, resulting in poor take-out properties. On the other hand, if the weight ratio of film 32 is more than 5.0%, film 32 at outlet 31 will be too thick, resulting in poor take-out properties.

[0031] [Hygienic tissue paper] The sanitary thin paper 20 of the present invention will be described in detail below.

[0032] The sanitary thin paper 20 of this embodiment is, for example, tissue paper. The sanitary thin paper 20 is preferably processed using a multi-stand type interfolder (processing machine). When processing the sanitary thin paper 20, first, an original sheet (not shown) is stacked into two plies (two sheets), slit to a predetermined width, and formed into a sheet having a predetermined basis weight and thickness (calendar processing step). Next, the obtained sheet is knurled, and then the sheets are folded using a multi-stand type interfolder and stacked so that they overlap each other (stacking step). Thereafter, the stacked sheets are compressed and cut to a predetermined size to form a stack 3 (sometimes called a "clip") (compression step). The stack 3 (see FIG. 2) thus obtained is filled into a paper storage box 30 (sometimes called a "carton"). That is, the sanitary thin paper 20 is a set of two plies of sanitary thin paper 20.

[0033] (Calendar processing process) In the calendaring process, a machine winder (not shown) is used to overlap two plies of one raw sheet and perform calendaring, and at the same time, knurling processing is performed to obtain sheet 1 (calendaring is not essential).

[0034] (Lamination process) In the lamination process, the knurled sheets 1 are laminated to obtain a laminated bundle 2. Fig. 3 is a schematic diagram showing the configuration of the folding section of a multi-stand type interfolder. Fig. 4 is a schematic perspective view of a folding plate device constituting the folding section shown in Fig. 3.

[0035] As shown in Figures 3 and 4, in the stacking step, the sheets 1 are folded set by set and folded so that they overlap. The folding form of the sheets 1 is not particularly limited as long as it allows the sheets 1 to be taken out set by set in a pop-up manner, and can be, for example, a V fold or a Z fold, but it is preferable to fold the sheets 1 in half at the center and stack them. The folding of the sheets 1 is performed in the folding section 101 of the multi-stand type interfolder 100.

[0036] The number of sets of sheets 1 can be varied by adjusting the number of folding plate devices 101a, 101b, 101c, etc., arranged in the folding section 101. For convenience, only three folding plate devices 101a, 101b, 101c are shown in Fig. 3, but the folding section 101 of the multi-stand type interfolder 100 has a plurality of folding plate devices 101a, 101b, 101c, etc., arranged on the conveying line.

[0037] Next, folding in one folding plate device 101a will be described. As shown in FIG. 4, in the folding plate device 101a, a plurality of sheets 1 cut to a product width are introduced, and the feeding direction is changed by a first guide roll 102 (see FIG. 3). After that, two sheets 1 are oriented by a second guide roll 103 so as to contact each other, and finally, the sheets are guided by a folding plate 104 and folded together to form an uncompressed stacked bundle 2, which is a long laminate. The folding section 101 may include at least one touch roll 106 arranged above the conveyor 105 between at least one of the adjacent folding plate devices 101a, 101b, 101c, etc. The touch roll 106 is a roll that supports the transported object by its own weight without applying pressure, unlike a pinch roll or a nip roll that actively presses the transported object to feed it.

[0038] The multi-stand type interfolder 100 can be configured to include multiple PR stands (e.g., three or more) in front of the folding section 101, and to feed the sheet 1 from the PR stands to the folding section 101. In addition, the configuration of the multi-stand type interfolder 100 may be appropriately modified within the scope in which the effect of this embodiment can be obtained.

[0039] In this way, a set of sheets 1 folded by one folding plate device 101a is folded so as to interlock with a set of sheets 1 on the next folding plate device 101b arranged downstream on the conveyor 105. Subsequently, a set of sheets 1 folded by the further next folding plate device 101c is folded so as to interlock with this set of sheets 1. In this way, sheets 1 folded by folding plate devices (not shown) arranged on the conveyor 105 are successively interlocked in sequence to obtain an uncompressed stack 2.

[0040] (Compression process) In the compression process, for example, the uncompressed stack 2 can be compressed by passing it between pull units (not shown) arranged above and below it. The uncompressed stack 2 is compressed in the stacking direction by the upper and lower pull units to obtain a compressed stack 2. The compressed stack 2 is then cut to the product length by a cut-off saw or the like to obtain a stack 3 (clip) of sanitary thin paper 20.

[0041] (Packing process) In the boxing process, the storage box 30 is fed into a processing machine (not shown) called a cartoner, and a stack 3 (clip) of sanitary thin paper 20 that is alternately folded and stacked so that it can be removed in a pop-up style is inserted into the side of the storage box 30, and the side of the storage box 30 is sealed and crimped with an adhesive. This makes it possible to obtain a sanitary thin paper-containing storage box 10 inside the storage box 30, with the stack 3 of sanitary thin paper 20 stored therein and removable in a pop-up style.

[0042] When the sanitary thin paper 20 is processed using a multi-stand type interfolder in this way, the pull-out direction of the sanitary thin paper 20 stored in the storage box 30 is the CD direction. As shown in Figure 2, the sanitary thin paper 20 in the storage box 30 is folded in a V-shape in cross section when viewed from the short side direction of the storage box 30, and is stored in a pop-up style so that it can be removed.

[0043] (Number of pairs) The number of sets of sanitary thin paper 20 stored in the storage box 10 containing sanitary thin paper is 220 sets or more and 300 sets or less. If the number of sets of sanitary thin paper 20 is less than 220 sets, a large-capacity storage box 10 containing sanitary thin paper cannot be obtained, and the drop-back phenomenon is likely to occur. On the other hand, if the number of sets of sanitary thin paper 20 is more than 300 sets, the density inside the storage box described below becomes too high, and the sanitary thin paper 20 is likely to tear when removed. The lower limit of the range of the number of sets of sanitary thin paper 20 is preferably 230 sets or more, and more preferably 240 sets or more. The upper limit of the range of the number of sets of sanitary thin paper 20 is preferably 280 sets or less, and more preferably 260 sets or less.

[0044] (Dimensions of sanitary tissue paper) The length of the sanitary thin paper 20 in the pull-out direction (CD direction) is preferably 150 mm or more and 240 mm or less. If the length of the sanitary thin paper 20 in the pull-out direction is shorter than 150 mm, the drop-back phenomenon is likely to occur. On the other hand, if the length of the sanitary thin paper 20 in the pull-out direction is longer than 240 mm, the volume of the clips increases when stacked, making it difficult to obtain a compact storage box 10 containing sanitary thin paper. The lower limit of the length range of the sanitary thin paper 20 in the pull-out direction is more preferably 170 mm or more, and even more preferably 190 mm or more. The upper limit of the length range of the sanitary thin paper 20 in the pull-out direction is more preferably 230 mm or less, and even more preferably 210 mm or less.

[0045] The length of the sanitary thin paper 20 in the direction (MD direction) intersecting (perpendicular) with the unwinding direction is preferably 155 mm or more and 245 mm or less. If the length of the sanitary thin paper 20 in the direction intersecting with the unwinding direction is shorter than 155 mm, the drop back phenomenon is likely to occur. On the other hand, if the length of the sanitary thin paper 20 in the direction intersecting with the unwinding direction is longer than 240 mm, the sanitary thin paper 20 is likely to get caught in the slit 33 of the take-out opening 31 when the sanitary thin paper 20 is taken out, making it difficult to take out. The lower limit of the length of the sanitary thin paper 20 in the direction intersecting with the unwinding direction is more preferably 175 mm or more, and even more preferably 195 mm or more. The upper limit of the length of the sanitary thin paper 20 in the direction intersecting with the unwinding direction is more preferably 235 mm or less, and even more preferably 215 mm or less.

[0046] (Hygienic tissue paper and slit length) The value represented by the following formula (2) is preferably 1.05 or more and 1.55 or less. (Length in the direction crossing the direction in which the sanitary tissue paper is pulled out (mm)) / (Length of the slit at the outlet of the storage box (mm)) (2) If the value represented by the above formula (2) is smaller than 1.05, the drop-back phenomenon is more likely to occur. On the other hand, if the value represented by the above formula (2) is larger than 1.55, the sanitary thin paper 20 is more likely to get caught in the slit 33 of the outlet 31 when the sanitary thin paper 20 is removed, making it difficult to remove. The lower limit of the range of values ​​represented by the above formula (2) is more preferably 1.10 or more, and even more preferably 1.20 or more. The upper limit of the range of values ​​represented by the above formula (2) is more preferably 1.50 or less, and even more preferably 1.45 or less.

[0047] (Drawing direction tensile strength (DCDT)) The tensile strength DCDT (Dry Cross Direction Tensile strength) in the pulling direction (CD direction) of the sanitary thin paper 20 when dry is 0.7 N / 25 mm or more and 2.5 N / 25 mm or less. If the tensile strength DCDT is smaller than 0.7 N / 25 mm, the strength in the pulling direction becomes too low, and the sanitary thin paper 20 becomes easily torn when the sanitary thin paper 20 is taken out. On the other hand, if the tensile strength DCDT is larger than 2.5 N / 25 mm, the sanitary thin paper 20 becomes too hard and has a poor feel to the touch. The lower limit of the range of the tensile strength DCDT is preferably 0.9 N / 25 mm or more, and more preferably 1.1 N / 25 mm or more. The upper limit of the range of the tensile strength DCDT is preferably 2.1 N / 25 mm or less, and more preferably 1.7 N / 25 mm or less.

[0048] (Tensile strength in the direction crossing the pull direction (DMDT)) The tensile strength DMDT (Dry Machine Direction Tensile strength) in the direction intersecting the pulling direction (MD direction) of the sanitary thin paper 20 during drying is preferably 3.0 N / 25 mm or more and 6.0 N / 25 mm or less. If the tensile strength DCDT is greater than 6.0 N / 25 mm, the sanitary thin paper 20 becomes too hard and has a poor feel to the touch. The lower limit of the range of the tensile strength DMDT is more preferably 3.6 N / 25 mm or more, and even more preferably 4.2 N / 25 mm or more. The upper limit of the range of the tensile strength DMDT is more preferably 5.6 N / 25 mm or less, and even more preferably 5.2 N / 25 mm or less.

[0049] (Measurement of tensile strength) The tensile strength DCDT and tensile strength DMDT of the sanitary thin paper 20 are measured based on JIS P 8113. However, the tensile strength DCDT and DMDT are measured using a 25 mm wide sanitary thin paper 20 (2 ply) as a sample, with a pulling speed of 300 mm / min, a distance between the grippers of 100 mm, and after maintaining the sample in an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1°C, 50±2% RH).

[0050] (density inside storage box) The density inside the storage box, expressed by the following formula (3), is 3.5 or more and 5.0 or less. (Number of sets of sanitary tissue paper (sets)) / (Height of storage box HC (mm)) (3) If the density inside the storage box is set to less than 3.5, the number of sets of sanitary thin paper 20 relative to the height HC of the storage box 30 will be too small, making it impossible to obtain a large-capacity, compact storage box 10 containing sanitary thin paper. On the other hand, if the density inside the storage box is set to more than 5.0, the number of sets of sanitary thin paper 20 relative to the height HC of the storage box 30 will be too large, so resistance will be strong when removing the sanitary thin paper 20, making it easier for the sanitary thin paper 20 to tear. The lower limit of the range of the density inside the storage box is preferably 3.7 or more, and more preferably 3.9 or more. The upper limit of the range of the density inside the storage box is preferably 4.6 or less, and more preferably 4.2 or less.

[0051] (paper thickness) The thickness of the sanitary thin paper 20 per 10 plies (hereinafter simply referred to as the "thickness of the sanitary thin paper 20") is preferably 0.38 mm / 10 ply or more and 0.75 mm / 10 ply or less. If the thickness of the sanitary thin paper 20 is thinner than 0.38 mm / 10 ply, the strength will be too low and the sanitary thin paper 20 will be easily torn when the sanitary thin paper 20 is removed. On the other hand, if the thickness of the sanitary thin paper 20 is thicker than 0.75 mm / 10 ply, the height of the clip will be too high when the capacity is increased, making it difficult to obtain a compact storage box 10 containing sanitary thin paper. The lower limit of the range of the thickness of the sanitary thin paper 20 is more preferably 0.43 mm / 10 ply or more, and even more preferably 0.46 mm / 10 ply or more. Moreover, the upper limit of the range of the paper thickness of the sanitary thin paper 20 is more preferably 0.70 mm / 10 ply or less, and even more preferably 0.60 mm / 10 ply or less.

[0052] The paper thickness is measured using the following method. The device used is a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a gauge head diameter of 30 mm. The sample is placed between the gauge head and the measurement table, and the gauge is read when the gauge head is lowered at a speed of 1 mm per second or less. One measurement is performed with 10 sheets of 1 ply (5 sets of 2 ply sheets) stacked together, and the measurement is repeated 10 times to average the measurement results.

[0053] (Basic weight) The basis weight of one ply of the sanitary thin paper 20 (hereinafter simply referred to as the "basis weight of the sanitary thin paper 20") is 9 g / m 2 More than 15g / m 2 The basis weight of the sanitary thin paper 20 is preferably 9 g / m or less. 2 If the grammage of the sanitary thin paper 20 is smaller than 15 g / m, the sanitary thin paper 20 is easily torn when the sanitary thin paper 20 is taken out. 2 If the weight is larger than 14 g / m, the feel is poor. 2 More preferably, it is 13 g / m or less. 2 It is more preferable that the basis weight is not more than 1000 g / m2.

[0054] (formation index) The formation index of one sheet of sanitary thin paper 20 measured by the sum of β-rays (hereinafter simply referred to as the "formation index of sanitary thin paper 20") is 2.2 or less. If the formation index of the sanitary thin paper 20 is greater than 2.2, the unevenness of the formation will be large, making it easier for areas that can cause tears to form and making it difficult to remove. The upper limit of the range of the formation index of the sanitary thin paper 20 is more preferably 2.0 or less, and even more preferably 1.8 or less.

[0055] The texture of the sanitary thin paper 20 indicates the distribution state of the fibers (flow, collection, etc.) and their uniformity, and can be evaluated by the formation index. The smaller the value of the formation index, the better the texture.

[0056] The formation index of the sanitary thin paper 20 can be measured, for example, using a beta-formation tester MKII manufactured by Ambertec. For example, a sample piece taken from a single sheet of sanitary thin paper 20 is set on a measurement table (no distinction between front and back). One side of the sample piece set on the measurement table is irradiated with β-rays, and the amount of transmitted electrons is measured. The measurement area is 49 mm x 49 mm, and the measurement pitch is 1.0 mm x 1.0 mm (total of 2500 points). Since the amount of electrons absorbed in β-rays depends on the mass of the substance, the absolute mass at the measurement point can be obtained by measuring the amount of transmitted electrons. In the composition of the sanitary thin paper 20, the absorption coefficients of the components (fiber, internal additives, coating liquid, etc.) are approximately constant, so the value obtained here indicates the local mass change of the paper. After that, the standard deviation of the obtained values ​​is calculated, and this is taken as the formation index.

[0057] (TS750) When the sanitary thin paper 20 was measured by a tissue softness measuring device TSA (Tissue Softness Analyzer), the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), which was automatically obtained by the software on the TSA, was 6.5 dBV. 2 RMS above 11.0dBV 2 TS750 is 6.5dBV or less. 2 If the TS750 is set to be smaller than 11.0 dBV, the sanitary thin paper 20 becomes too bulky, and the height of the laminate 3 becomes too large when a large capacity is used, resulting in a loss of compactness. 2 If it is set higher than rms, the smoothness is lost and the feel is inferior. The lower limit of the range of the TS750 is 6.0 dBV. 2 rms or more is preferable, and 7.0 dBV 2 It is more preferable that the upper limit of the TS750 range is 10.0 dBV. 2 rms or less is preferable, and 9.0 dBV 2 It is more preferable that it is equal to or less than rms.

[0058] (TS7) When the sanitary thin paper 20 was measured by a tissue softness measuring device TSA (Tissue Softness Analyzer), the intensity of the maximum peak (TS7) of the spectrum including 6500 Hz, which was automatically obtained by the software on the TSA, was 11.0 dBV. 2 RMS over 15.5dBV 2 TS7 is preferably 11.0 dBV or less. 2 If TS7 is set to be smaller than rms, the sanitary thin paper 20 becomes too bulky, and the height of the laminate 3 becomes large when a large capacity is used, resulting in a loss of compactness. 2 If it is set higher than rms, the softness is lost and the feel is inferior. The lower limit of the TS7 range is 11.5 dBV. 2 rms or more is preferable, 12.0 dBV 2 It is more preferable that the upper limit of the TS7 range is 14.5 dBV. 2 rms or less is preferable, and 14.0 dBV 2 It is more preferable that it is equal to or less than rms.

[0059] In the specific measurement of TS750 and TS7 using TSA, a sample of sanitary tissue paper 20 (a sample processed into a circle with a diameter of about 112.8 mm using a sample punch made by Emtec) is placed so as to cover the outside of a circular sample stage, and the outer circumference of the sample is held by a sample fixing ring. Next, a rotor with blades is pressed into the sample from above with a pressing pressure of 100 mN, and then the rotor is rotated at a rotation speed of 2.0 ( / sec). Next, the vibration of the sample stage is measured by a vibration sensor installed inside the sample stage, and the vibration frequency is analyzed.

[0060] For details of the measurement method of the TS750 value using the tissue softness measuring device TSA and the measuring device used therein, see, for example, JP 2013-236904 A. For various measurement methods using the tissue softness measuring device TSA, the above patent documents can be referred to.

[0061] (Pinhole) 0.05 mm per 45 mm x 45 mm on the surface of sanitary tissue paper 20 2 The number of the following pinholes (small holes) (hereinafter simply referred to as "number of pinholes") is preferably 1 to 200. If the number of pinholes is more than 200, the appearance is deteriorated and parts that can become the trigger for tearing are easily formed, resulting in poor removability. The upper limit of the range of the number of pinholes is more preferably 180 or less, and even more preferably 160 or less.

[0062] The number of pinholes can be measured, for example, using a digital microscope VHX-8000 manufactured by Keyence Corporation (hereinafter sometimes referred to as the "measuring instrument"). First, a sample piece taken from the sanitary thin paper 20 is placed on the stage (black) of the measuring instrument. Next, in the measuring instrument, the illumination and brightness are set to 100 for ring illumination, 50 for anti-reflection brightness, 2D linkage is set to 50 mm in the Y direction and 50 mm in the X direction, and the objective lens is set to VHX-E20·50x (tilt angle: 0 degrees) to obtain a linked image. Next, the obtained image is grayscaled in 8 bits (256 steps), 0 to 50 steps are specified by binarization, and the minimum area of ​​the pinhole is set to 0.05 mm. 2 The pinhole (small hole) part is captured in the image with the color of the stage, so if the stage is black, 8-bit levels 0 to 50 can be detected as pinholes (small holes). Finally, the number of pinholes in the specified range (45mm x 45mm) is counted, and this is the number of pinholes (small holes).

[0063] In the sanitary tissue paper-containing storage box 10 configured as described above, the number of sets of sanitary tissue paper 20 is 220 to 300 sets, and the height HC of the storage box 30 is 44 mm to 80 mm, so it is possible to provide a large-capacity, compact sanitary tissue paper-containing storage box 10. In addition, because the number of sets of sanitary tissue paper 20 is 220 to 300 sets, and the height HC of the storage box 30 is 44 mm to 80 mm, the sanitary tissue paper 20 is less likely to tear when removed.

[0064] In addition, since the formation index of the sanitary thin paper 20 is 2.2 or less, the sanitary thin paper 20 is less likely to tear when removed.

[0065] In addition, since the tensile strength DCDT is 0.7 N / 25 mm or more and 2.5 N / 25 mm or less, tearing of the sanitary thin paper 20 when it is removed can be suppressed and the feel of the paper is not impaired.

[0066] In addition, since the internal density of the storage box is 3.5 or more and 5.0 or less, a large-capacity and compact storage box 10 containing sanitary tissue paper can be provided, and resistance when removing the first few sheets of sanitary tissue paper 20 can be reduced.

[0067] In this way, according to this embodiment, it is possible to provide a sanitary tissue paper storage box 10 that can be manufactured using a multi-stand type interfolder, is compact, makes it easy to remove the first few sheets, is less likely to tear when removed, and does not impair the feel of the box.

[0068] Although the present invention has been described based on the above embodiment, the present invention is not limited to the contents of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, and operational techniques made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. EXAMPLES

[0069] The present embodiment will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0070] (Examples 1 to 15 and Comparative Examples 1 to 7) Sanitary tissue paper-containing storage boxes of Examples 1 to 15 and Comparative Examples 1 to 7 were produced (all had 2 plies) under the conditions shown in Tables 1 and 2. Each sanitary tissue paper-containing storage box was evaluated in the following five ways (evaluation of "resistance to tearing when removed", "large capacity and compactness", "drop back", "touch", and "productivity").

[0071] (Resistance to tearing when removed) The evaluation of "resistance to tearing when removed" was an evaluation of how difficult it was for the sanitary tissue paper to tear when it was removed from the storage box containing the sanitary tissue paper, and was a sensory evaluation by 30 panelists. Each panelist was asked to use one storage box containing sanitary tissue paper, and the average number of sheets of sanitary tissue paper that were torn during use was calculated and rated according to the following criteria. ◎: 0 torn sheets of sanitary tissue paper ○: The number of torn sanitary tissue paper sheets is 1 to 2 △: 3 to 4 torn sheets of sanitary tissue paper ×: 5 or more pieces of torn sanitary tissue paper

[0072] (Large capacity and compact size) The evaluation of "large capacity and compactness" is based on the density inside the storage box (rounded to one decimal place) calculated from (number of sets of sanitary tissue paper (sets)) / (height of storage box HC (mm)), and was performed according to the following criteria. Note that in the table, the number of sets of sanitary tissue paper is listed in "Number of sets" in the "Clip" column, and the height of the storage box is listed in "Carton height" in the "Carton" column. ◎: Density inside the storage box is 3.9 to 4.2 ○: Density inside the storage box is 3.7 to 3.8 or 4.3 to 4.6 △: Density inside the storage box is 3.5 to 3.6 or 4.7 to 5.0 ×: Density inside the storage box is 3.4 or less or 5.1 or more

[0073] (Drop Back) The "drop back" evaluation was conducted by 30 panelists to assess the occurrence of the drop back phenomenon. Each panelist was asked to use one storage box containing sanitary tissue paper, and the average number of times the box dropped back during use was calculated and rated according to the following criteria. ◎: 0 dropbacks ○: Drop back once △: Drop back 2-3 times ×: Drop back 4 or more times

[0074] (Texture) The evaluation of "feeling to the touch" was an evaluation of the feel of the sanitary tissue paper, and was a sensory evaluation by 30 panelists. Each panelist evaluated the feel of the sanitary tissue paper, and the evaluation was based on the following criteria. ◎: More than 28 people answered that the texture is good ○: 25 to 27 people answered that the texture is good △: 21 to 24 people answered that the texture is good ×: Fewer than 20 people answered that the texture was good

[0075] (Productivity) The "productivity" evaluation was an evaluation of the productivity of storage boxes containing sanitary tissue paper, and was based on the type of processing machine used during production ("processing machine type" in the table). ◎: When processing using a multi-stand type interfolder ×: When using a rotary interfolder

[0076] The results are shown in Tables 1 and 2. In the "Machine Type" column in Tables 1 and 2, "Multi" indicates that a multi-stand type interfolder was used for processing, and "Inter" indicates that a rotary type interfolder was used for processing.

[0077] [Table 1]

[0078] [Table 2]

[0079] From Tables 1 and 2, it can be confirmed that according to the present disclosure, it is possible to provide a storage box containing sanitary tissue paper that can be manufactured using a multi-stand type interfolder, is compact, makes it easy to remove the first few sheets, is less likely to tear when removed, and does not impair the feel of the box. [Explanation of symbols]

[0080] 10: Storage box with sanitary tissue paper 20: Sanitary tissue paper 30: Storage box 31: Outlet 32:Film 33: Slit

Claims

1. A storage box containing sanitary tissue paper, the storage box having an outlet through which the sanitary tissue paper can be taken out, and a stack of the sanitary tissue paper that can be taken out in a pop-up style is stored inside the storage box, The pulling direction of the sanitary thin paper is the CD direction of the sanitary thin paper, The number of sets of the sanitary thin paper is 220 sets or more and 300 sets or less, The height of the storage box is 44 mm or more and 80 mm or less, The formation index of one sheet of the sanitary thin paper measured by β-ray spectroscopy is 2.2 or less; The tensile strength of the sanitary thin paper in the pulling direction when dry is 0.7 N / 25 mm or more and 2.5 N / 25 mm or less, The density inside the storage box, expressed by the formula: (number of sets of the sanitary thin paper (sets)) / (height of the storage box (mm)), is 3.5 or more and 5.0 or less. A storage box containing sanitary tissue paper.

2. The basis weight of one ply of the sanitary thin paper is 9 g / m ２ 15g / m or more ２ Is less than or equal to 2. The sanitary tissue paper-containing storage box according to claim 1.

3. A film is provided at the outlet of the storage box, The ratio of the weight of the film to the total weight of the storage box containing the sanitary tissue paper is 0.2% or more and 5.0% or less.

3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

4. The thickness of the sanitary thin paper is 0.38 mm / 10 ply or more and 0.75 mm / 10 ply or less.

3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

5. The slit length of the outlet of the storage box is 140 mm or more and 190 mm or less.

3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

6. The value represented by the formula: (length (mm) in the direction intersecting the pull-out direction of the sanitary thin paper) / (slit length (mm) of the outlet of the storage box) is 1.05 or more and 1.55 or less.

3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

7. Using a tissue softness measuring device (TSA), a bladed rotor was pressed from above against the sanitary thin paper sample placed on a sample stage with a pressing pressure of 100 mN, and then rotated at a rotation speed of 2.0 ( / sec). When the vibration of the sample stage was measured with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), which was automatically obtained by the software on the TSA, was 6.5 dBV. ２ rms above 11.0dBV ２ rms or less, and the intensity of the maximum peak of the spectrum containing 6500 Hz (TS7) is 11.0 dBV ２ rms or more 15.5dBV ２ Less than or equal to rms 3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

8. The tensile strength of the sanitary thin paper in a direction crossing the pulling direction during drying is 3 N / 25 mm or more and 6 N / 25 mm or less.

3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

9. 0.05 mm per 45 mm x 45 mm on the surface of the sanitary tissue paper ２ The number of pinholes is between 1 and 200.

3. The sanitary tissue paper-containing storage box according to claim 1 or 2.

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