Storage box containing sanitary tissue paper

Abstract

To provide a film-less sanitary tissue paper-containing storage box, from a center of which a lid part is opened, whose perforation line is difficult to be unintentionally damaged by suppressing inter-layer peeling during opening.SOLUTION: According to the present invention, a sanitary tissue paper-containing storage box 10 provided with no film at an outlet 13 of a storage box 11 comprises sanitary tissue paper 20 inside the storage box 11. The outlet 13 has a shape of extending in a longitudinal direction of the storage box 11. According to the sanitary tissue paper-containing storage box 10 comprising a central part, and a longitudinal opening extending onto both sides of a longitudinal direction of the central part, length in a short side direction at the central part is longer than that in the short side direction at both ends of the longitudinal opening; there is provided a lid part 14 surrounded by a first perforation line 12 at the outlet 13, that closes the outlet 13; and the lid part 14 is provided with a second perforation line 16 dividing the lid part 14 into two in a longitudinal direction, and a third perforation line 17 constituting an opening tab 15.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a storage box containing sanitary tissue paper.

Background Art

[0002] For sanitary tissue paper such as tissue paper, perforations are provided in a circular shape so as to form an outlet for the sanitary tissue paper at a predetermined position on the top surface of a rectangular cardboard body. Inside the outlet, there is a storage box in which a window sticker sheet made of a plastic film such as a polyethylene film having a linear slit is fixed. On the other hand, a filmless storage box (also referred to as a filmless carton) that does not have a plastic film and aims at waste treatment measures after use and low cost is also widespread. In addition, in order to save resources, consideration is being given to reducing the basis weight of the carton. In a conventional filmless storage box, when the outlet is enlarged, it is easy for dust and the like to enter the storage box, and it becomes difficult to hold the next sanitary tissue paper. Therefore, a storage box having a narrow outlet shape is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the short side direction of the extraction opening is narrowed, in the case of a container having an unsealing tab (pushing tab) portion formed on one side in the longitudinal direction (see Fig. 11), when picking up the unsealing tab portion and pulling up the extraction opening piece surrounded by the perforation, the cardboard constituting the storage box may delaminate between layers and not break well along the perforation, and the extraction opening may not be properly formed. Therefore, in order to improve the unsealing property, consideration has been given to unsealing from the center of the lid portion toward both sides. However, when processed at high speed by a multi-stand type interfolder, in the storage box conveyance process, a strong load is applied to the extraction opening of the storage box, and there is a problem that unintended perforation breakage occurs. These phenomena become prominent when the basis weight of the storage box is low and the dimensions of the storage box are small. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a film-less storage box containing sanitary tissue paper that unseals from the center of the lid portion toward both sides, in which delamination between layers during unsealing is suppressed and unintended perforation breakage is less likely to occur.

Means for Solving the Problems

[0005] As a result of intensive studies, the inventor of the present invention has found that in a film-less storage box containing sanitary tissue paper that unseals from the center of the lid portion toward both sides, by providing a double perforation portion in the perforation around the lid portion, delamination between layers during unsealing is suppressed and unintended perforation breakage is less likely to occur, leading to the present invention.

[0006] That is, the present invention is a storage box containing sanitary tissue paper having sanitary tissue paper inside the storage box and no film at the extraction opening of the storage box. The extraction opening has a shape extending in the longitudinal direction of the storage box, and has a central portion and longitudinal opening portions extending on both sides in the longitudinal direction of the central portion. The length in the short side direction at the central portion is larger than the length in the short side direction at both end portions of the longitudinal opening portions. The extraction opening has a lid portion surrounded by a first perforation that closes the extraction opening. The lid portion has a second perforation that divides the lid portion into two in the longitudinal direction and a third perforation that constitutes an unsealing tab. The basis weight of the storage box is 230 g / m 2 to 340 g / m above 2The following is the case where the length of the storage box in the longitudinal direction is 200 mm or more and 260 mm or less, the length in the short direction is 90 mm or more and 130 mm or less, the extraction direction of the sanitary tissue paper is the CD direction, the length in the short direction at both ends of the longitudinal opening is 8 mm or more and 30 mm or less, the first stitch line is in the range of minus 9% or more and plus 9% or less with respect to the length in the longitudinal direction, based on the center in the longitudinal direction of the lid portion, and is composed of an inner stitch line and an outer stitch line arranged outside the inner stitch line, and a storage box containing sanitary tissue paper having a double stitch line portion in which the respective cut portions are arranged in a staggered pattern.

[0007] It is preferable that the cutting width of the outer stitch line is 0.3 mm or more and 1.2 mm or less, and the cutting width of the inner stitch line is 0.5 mm or more and 1.5 mm or less.

[0008] It is preferable that the ratio of the total length of the double stitch line portion to the perimeter of the extraction opening is 20% or more and 90% or less.

[0009] It is preferable to open the lid on both sides in the longitudinal direction from the center of the extraction opening.

[0010] The opening tab is a semi-circular or semi-elliptical push-in piece, and it is preferable that the length in the longitudinal direction of the opening tab is 10 mm or more and 30 mm or less, and the length in the short direction is 14 mm or more and 30 mm or less.

[0011] It is preferable that the R of the curved portion of the push-in piece is 7 mm or more and 15 mm or less.

[0012] It is preferable that the number of sets of the sanitary tissue paper is 100 sets or more and 260 sets or less.

[0013] It is preferable that the length in the extraction direction of the sanitary tissue paper is 150 mm or more and 240 mm or less, and the length in the direction orthogonal to the extraction direction of the sanitary tissue paper is 160 mm or more and 260 mm or less.

Advantages of the Invention

[0014] According to the present invention, there is provided a film-less storage box containing sanitary tissue paper that opens from the center of the lid, which can suppress delamination between layers during opening and is less likely to cause accidental perforation damage, providing a storage box containing sanitary tissue paper.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0016] Hereinafter, with reference to the accompanying drawings, the embodiments for carrying out the present invention will be described in detail. Throughout the description of the embodiments of the present invention, the same elements are denoted by the same reference numerals.

[0017] [Storage Box Containing Sanitary Tissue Paper] As shown in Fig. 1, the storage box 10 for sanitary tissue paper of the present invention has sanitary tissue paper 20 inside the storage box 11 and has no film at the outlet 13. The sanitary tissue paper 20 is folded by a fold line 21 and stored in the storage box 11 as shown in Fig. 2, for example. The longitudinal direction of the storage box 11 is the X direction in the figure, and the short side direction is the Y direction in the figure. The drawing-out direction of the sanitary tissue paper 20 is the direction of the upward arrow in Fig. 2, and the direction perpendicular to the drawing-out direction corresponds to the X direction of the storage box 11.

[0018] (Storage box) The storage box 11 in the storage box 10 for sanitary tissue paper of the present invention is a rectangular parallelepiped made of paper. -Grammage- The grammage of the storage box 11 is 230 g / m 2 or more and 340 g / m 2 or less. 240 g / m 2 or more and 320 g / m 2 or less is preferable, and 250 g / m 2 or more and 300 g / m 2 or less is more preferable. When the grammage of the storage box 11 is 200 g / m 2 or more, unintentional perforation damage is less likely to occur, and when it is 340 g / m 2 or less, delamination at the time of opening is suppressed. In addition, the strength of the storage box 11 can be maintained so that the storage box 11 is not easily crushed, and the box-making property of the storage box 11 is also maintained well. The box-making property refers to the ease of box erection when deforming the storage box 11 from the double-folded state to a square columnar cylinder, and the ease of sealing the opening when folding the short-side flaps and the height-side flaps when accommodating (filling) the laminate of the sanitary tissue paper 20 in the storage box 11 after box erection. The grammage of the storage box 11 is a value measured based on JIS P 8124.

[0019] -Size of storage box- The length L in the longitudinal direction of the storage box 11 C(In the X direction in FIG. 1) is 200 mm or more and 260 mm or less. It is preferably 210 mm or more and 250 mm or less, and more preferably 220 mm or more and 240 mm or less. Also, the height H of the storage box 11 C (In the Z direction in FIG. 1) is preferably 35 mm or more and 77 mm or less, more preferably 35 mm or more and 64 mm or less, and even more preferably 35 mm or more and 58 mm or less. Also, the length W of the storage box 11 in the short side direction (in the Y direction in FIG. 1, hereinafter may be referred to as the short side direction) C is 90 mm or more and 130 mm or less. It is preferably 95 mm or more and 125 mm or less, and more preferably 100 mm or more and 120 mm or less. The length L in the longitudinal direction C and the length W in the short side direction C The preferred combination is that the length L in the longitudinal direction C is 220 mm or more and 240 mm or less, and the length W in the short side direction C is 100 mm or more and 120 mm or less. By setting the size of the storage box 11 within the above range, it becomes easier to open the lid.

[0020] (Take-out port) The take-out port 13 of this embodiment has a substantially elliptical central portion A and longitudinal opening portions B1 and B2 extending on both sides thereof, and both end portions 18 in the longitudinal opening portions B1 and B2.

[0021] Here, the "central portion" in the longitudinal direction of the take-out port 13 refers to a region of 45% or more and 55% or less of the length L in the longitudinal direction of the take-out port 13 including the center in the longitudinal direction. 13 indicates a region of 45% or more and 55% or less of the length L in the longitudinal direction of the take-out port 13 including the center in the longitudinal direction. Also, the "longitudinal opening portion" is located on both sides in the longitudinal direction of the central portion A, and each indicates a region greater than 0% and 28% or less of the length L in the longitudinal direction of the take-out port 13. 13 indicates a region greater than 0% and 28% or less of the length L in the longitudinal direction of the take-out port 13. Furthermore, the "both end portions" refer to a region of 0% or more and 15% or less in the longitudinal direction from the ends 18a of the longitudinal opening portions B1 and B2.

[0022] The length L in the longitudinal direction (X direction) of the extraction opening 13 13 is preferably 130 mm or more and 220 mm or less, more preferably 155 mm or more and 215 mm or less, and even more preferably 165 mm or more and 210 mm or less. The length L in the longitudinal direction of the extraction opening 13 13 being 135 mm or more makes it easier to pull out the sanitary tissue paper 20, and being 220 mm or less makes the opening less likely to be damaged when opening the package.

[0023] The length W in the short direction (Y direction) at the central portion A of the extraction opening 13 a is larger than the length W in the short direction at both end portions 18 b The length W of the central portion A a being larger than the length W of both end portions 18 b has the advantage that the first sheet is easy to pick up and the subsequent sheets are easy to support.

[0024] The length W in the short direction at the central portion A of the longitudinal opening a is preferably 30 mm or more and 65 mm or less, more preferably 35 mm or more and 60 mm or less, and even more preferably 40 mm or more and 55 mm or less. By setting it within the above range, it becomes easier to open the extraction opening from the central portion. Note that W a represents the maximum value of the region at the central portion 14.

[0025] The length W in the short direction at both end portions 18 of the longitudinal opening b is 8 mm or more and 30 mm or less. It is more preferably 10 mm or more and 25 mm or less, and even more preferably 12 mm or more and 20 mm or less. The length W in the short direction at both end portions 18 b being 8 mm or more makes the opening less likely to be damaged when opening the package, and being 30 mm or less makes it less likely to drop back. Note that W b represents the maximum value of the region at both end portions 15.

[0026] The shape of the central portion A can be various shapes such as circular, elliptical, rectangular, etc. However, considering ease of opening, it is preferably circular or elliptical. As shown in FIG. 3, each end of the longitudinal openings B1 and B2 is preferably in an R shape.

[0027] The opening area of the take-out port 13 is preferably 2000 mm 2 or more and 7000 mm 2 or less. More preferably, it is 3000 mm 2 or more and 6000 mm 2 or less, and even more preferably, it is 3500 mm 2 or more and 5000 mm 2 or less. When the opening area of the take-out port 13 is 2000 mm 2 or more, it is easy to take out the sanitary tissue paper 20, and when it is 7000 mm 2 or less, it is difficult for dust to enter. Incidentally, the opening area can be measured as follows. First, as shown in FIG. 1, measure the mass and area of only the top surface 11a of the storage box 10 with the lid portion 14 attached. Next, after removing the lid portion 14 along the tear line 12 for opening, measure the mass of only the lid portion 14. Calculate the opening area from the ratio of the two masses. The opening area of the take-out port 13 is preferably 5% or more and 30% or less, more preferably 10% or more and 25% or less, and even more preferably 15% or more and 20% or less with respect to the area of the top surface 11a of the storage box 11.

[0028] - Lid portion - As shown in FIG. 5, the storage box 10 for sanitary tissue paper of the present invention has a lid portion 14 surrounded by the first tear line 12 that closes the take-out port 13 at the take-out port 13. The lid portion 14 has a second tear line 16 that divides the lid portion 14 into two in the longitudinal direction and a third tear line 17 formed in a semicircular shape that constitutes the opening tab 15.

[0029] As shown in FIG. 5, the longitudinal length L of the opening tab 15 15is preferably 10 mm or more and 30 mm or less, more preferably 10 mm or more and 22 mm or less, and still more preferably 10 mm or more and 16 mm or less. The length L in the longitudinal direction 15 being 10 mm or more makes it easy to pick up the pushing piece, and being 30 mm or less makes it easy to open the second stitch 16.

[0030] The length W in the short direction of the opening tab 15 15 is preferably 14 mm or more and 30 mm or less, more preferably 16 mm or more and 26 mm or less, and still more preferably 18 mm or more and 22 mm or less. The length W in the short direction 15 being 14 mm or more makes it easy to push in, and being 30 mm or less makes it easy to open the second stitch 16.

[0031] -Double stitch part- As shown in FIG. 6, the first stitch 12 is composed of an inner stitch and an outer stitch arranged outside the inner stitch in a range of at least minus 9% or more and plus 9% or less with respect to the length in the longitudinal direction, based on the center in the longitudinal direction of the lid portion 14, and has a double stitch portion 30 in which the respective cut portions are arranged in a staggered manner. The central double stitch portion 30 is preferably in a range of minus 12% or more and plus 12% or less with respect to the length in the longitudinal direction, based on the center in the longitudinal direction of the lid portion 14, and more preferably in a range of minus 15% or more and plus 15% or less. When the central double stitch portion 30 is wider than the range of minus 15% or more and plus 15% or less with respect to the length in the longitudinal direction, the storage box may be damaged during opening, and when it is narrower than the range of minus 9% or more and plus 9% or less, unintended stitch breakage may occur.

[0032] The storage box 10 containing sanitary tissue paper of the present invention has a central double perforation part 30 within the above range area, so that unintended perforation breakage does not occur and delamination during opening is suppressed. Since the cutting parts of the double perforation part are arranged in a staggered pattern, the durability against pressing during opening is increased. Therefore, by providing the central double perforation part 30 in the central part A, it is possible to prevent the storage box 11 from being damaged when the lid part is opened.

[0033] Furthermore, as shown in FIG. 6, the storage box 10 containing sanitary tissue paper of the present invention may have a left double perforation part 31 and a right double perforation part 32, which are composed of inner perforations and outer perforations arranged outside the inner perforations in the longitudinal opening parts B1 and B2, and the cutting parts thereof are arranged in a staggered pattern. Furthermore, by providing the left double perforation part 31 and the right double perforation part 32, it is possible to prevent delamination from occurring from the longitudinal opening parts B1 and B2 when peeling the lid part from the center to both sides.

[0034] If the left double perforation part 31 and the right double perforation part 32 are provided at the R-shaped parts at the ends of the longitudinal opening parts B1 and B2, it is difficult to maintain the staggered shape of the cutting parts and there is a possibility of causing poor opening. Therefore, the left double perforation part 31 and the right double perforation part 32 are preferably provided on two parallel sides of the longitudinal opening parts B1 and B2.

[0035] It is preferable that the cutting widths of the outer perforations 30a, 31a, and 32a of the central double perforation part 30, the left double perforation part 31, and the right double perforation part 32 are 0.3 mm or more and 1.2 mm or less, and the cutting widths of the inner perforations 30b, 31b, and 32b are 0.5 mm or more and 1.5 mm or less.

[0036] It is more preferable that the cutting widths of the outer stitches 30a, 31a, and 32a of the central double stitch portion 30, the left double stitch portion 31, and the right double stitch portion 32 are 0.4 mm or more and 1.0 mm or less, and the cutting widths of the inner stitches 30b, 31b, and 32b are 0.6 mm or more and 1.2 mm or less. It is even more preferable that the cutting widths of the outer stitches 30a, 31a, and 32a are 0.5 mm or more and 0.8 mm or less, and the cutting widths of the inner stitches 30b, 31b, and 32b are 0.7 mm or more and 1.0 mm or less.

[0037] Since the cutting widths of the outer stitches 30a, 31a, and 32a are 0.3 mm or more and the cutting widths of the inner stitches 30b, 31b, and 32b are 0.5 mm or more, it is possible to prevent damage to the storage box during opening. Since the cutting widths of the outer stitches 30a, 31a, and 32a are 1.2 mm or less and the cutting widths of the inner stitches 30b, 31b, and 32b are 1.5 mm or less, it is possible to prevent accidental stitch breakage.

[0038] Preferably, the ratio of the total length of the double stitch portions 30, 31, and 32 to the perimeter of the take-out opening 13 is 20% or more and 90% or less, more preferably 30% or more and 75% or less, and even more preferably 40% or more and 60% or less. Since the ratio of the total length of the double stitch portions 30, 31, and 32 to the perimeter of the take-out opening 13 is 20% or more, it is possible to prevent accidental stitch breakage. Since it is 90% or less, it is possible to prevent damage to the storage box during opening.

[0039] In the above description, the lid portion 14 having the opening tab 15 formed of a semi-circular pushing piece has been described, but it may also have an opening tab 15 formed of a semi-elliptical pushing piece as shown in FIGS. 7 and 8. In the form shown in FIG. 7, the lid portion 14 has a second stitch 16 provided at the center in the longitudinal direction for dividing the lid portion 14 into two in the longitudinal direction, and a third stitch 17 provided in a substantially elliptical shape constituting the opening tab 15. In the form shown in FIG. 8, the lid portion 14 has a second perforation 16 provided in an inclined direction with respect to the Y direction, and a third perforation 17 provided in a substantially elliptical shape continuously with the second perforation 16.

[0040] The lid portion 14 is opened as follows. This will be described with reference to FIGS. 9 and 10. The opening tab 15 shown in FIGS. 9 and 10 is the elliptical one of FIG. 7 above. First, as shown in FIG. 8, when the second perforation 16 is cleaved and the opening tab 15 is pushed into the interior, a hole is formed. Next, by putting a finger on the hole and pulling upward while splitting the lid portion 14 into two in the longitudinal direction as shown in FIG. 10, the first perforation 12 is cleaved and the lid portion 14 is removed.

[0041] The R of the curved portion of the opening tab 15 is preferably 7 mm or more and 15 mm or less, more preferably 8 mm or more and 13 mm or less, and still more preferably 9 mm or more and 11 mm or less. With such an R shape, it becomes easier to push in the opening tab 15.

[0042] (Toilet tissue paper) Details of the toilet tissue paper 20 in the present invention will be described below. The toilet tissue paper 20 can be tissue paper, paper towel, or paper wiper.

[0043] - Number of sets - The number of sets of the toilet tissue paper 20 stored in the storage box 10 containing the toilet tissue paper of the present invention is 100 sets or more and 260 sets or less. The number of sets is more preferably 140 sets or more and 240 sets or less, and still more preferably 150 sets or more and 220 sets or less.

[0044] - Paper thickness - In the toilet tissue paper 20, the paper thickness is preferably 35 μm or more and 85 μm or less per ply, more preferably 40 μm or more and 80 μm or less, and still more preferably 45 μm or more and 75 μm or less. Also, the toilet tissue paper 20 is preferably 2 plies per set.

[0045] The paper thickness shall be the value measured by the following method. The apparatus uses a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions are a measurement load of 250 gf and a measuring head diameter of 30 mm. Place the sample between the measuring head and the measuring table, and read the gauge when the measuring head is lowered at a speed of 1 mm or less per second. One measurement is performed by stacking 10 sheets of a single-ply sheet (5 sets of 2-ply sheets), repeating the measurement 10 times, averaging the measurement results, and then dividing the value by 10 to obtain the value per ply.

[0046] The ratio of the length L in the direction orthogonal to the drawing direction of the sanitary tissue paper 20 20 (see Figure 4) to the length L in the longitudinal direction of the outlet 13 13 (see Figure 3) is represented by the following formula (1), preferably 60% or more and 100% or less, more preferably 70% or more and 96% or less, and even more preferably 80% or more and 92% or less. Length in the longitudinal direction of the outlet (mm) / Length in the direction orthogonal to the drawing direction of the sanitary tissue paper (mm) × 100 ··· (1) When the value obtained by the above formula (1) is 60% or more, the sanitary tissue paper 20 can be taken out without being torn, and when it is 100% or less, the drop-back of the sanitary tissue paper 20 can be prevented.

[0047] The ratio of the height Hc of the storage box 11 to the length W in the drawing direction of the sanitary tissue paper 20, represented by the following formula (2), is preferably 10% or more and 40% or less, more preferably 14% or more and 34% or less, and even more preferably 18% or more and 28% or less. 20 Height of the storage box (mm) / Length in the drawing direction of the sanitary tissue paper (mm) × 100 ··· (2) When the ratio of the height Hc of the storage box 11 to the length W in the drawing direction of the sanitary tissue paper 20 is 10% or more, the drawability of the sanitary tissue paper 20 is improved, and when it is 40% or more, the drop-back of the sanitary tissue paper 20 can be prevented. The length W in the drawing direction of the sanitary tissue paper 20 20 When the ratio of the height Hc of the storage box 11 to the length W in the drawing direction of the sanitary tissue paper 20 is 10% or more, the drawability of the sanitary tissue paper 20 is improved, and when it is 40% or more, the drop-back of the sanitary tissue paper 20 can be prevented.

[0048] The ratio of the height Hc of the storage box 11 to the number of sets of the sanitary tissue paper 20 represented by the following formula (3) is preferably 16 or more and 40 or less, more preferably 18 or more and 34 or less, and still more preferably 20 or more and 28 or less. (Height of storage box (mm) / Number of sets of sanitary tissue paper) × 100 ··· (3) When the ratio of the height Hc of the storage box 11 to the number of sets of the sanitary tissue paper 20 is 16 or more, the drawability of the sanitary tissue paper 20 is improved. When it is 40 or less, the upper space is appropriately empty, so that the first sheet of the sanitary tissue paper 20 is easy to pick up.

[0049] Also, in relation to the storage box 11, the value represented by the following formula (4) for the sanitary tissue paper 20 is preferably 15 or more and 25 or less, more preferably 14 or more and 24 or less, and still more preferably 16 or more and 23 or less. (Number of sets of sanitary tissue paper × Paper thickness of sanitary tissue paper (μm) / 1000 / Height of storage box (mm)) × 100 ··· (4) Note that the paper thickness (μm) of the sanitary tissue paper indicates the paper thickness per ply. When the value obtained by the above formula (4) is 15 or more, the upper space is appropriately empty, so that the first set of the sanitary tissue paper 20 is easy to pick up. When it is 25 or less, the pressure on the sanitary tissue paper 20 from the top surface 11a of the storage box 11 is small, and the sanitary tissue paper 20 can be smoothly taken out without being torn.

[0050] -Basis weight- The basis weight per ply of the sheet in the sanitary tissue paper 20 is 9 g / m 2 or more and 21 g / m 2 or less, preferably 9 g / m 2 or more and 19 g / m 2 or less, more preferably 9 g / m 2 or more and 17 g / m 2 or less, still more preferably. The basis weight is a value measured based on JIS P 8124.

[0051] By setting the paper thickness of the sanitary tissue paper 20 and the basis weight per sheet within the above ranges, it becomes possible to achieve both softness, volume feeling, and the compactness of the storage box 11. Further, when the sanitary tissue paper 20 is taken out from the storage box 11, it is less likely to tear and is easy to take out. Note that the above basis weight and paper thickness refer to those of the sanitary tissue paper 20 itself, and mean the basis weight and paper thickness of the sanitary tissue paper 20 in a state where the chemical solution is applied.

[0052] The sanitary tissue paper 20 stored in the storage box 11 has the drawing direction of the sanitary tissue paper 20 in the CD (Cross Direction) direction. The sanitary tissue paper 20 is preferably processed by a multi-stand type interfolder. When processed by a multi-stand type interfolder, the drawing direction becomes the CD direction. As shown in FIG. 2, the sanitary tissue paper 20 in the storage box 11 is preferably folded in a V-shaped cross section when viewed from the short side direction of the storage box 11 and stored in a pop-up manner.

[0053] ― The length W in the drawing direction of the sanitary tissue paper 20 - The length W in the drawing direction of the sanitary tissue paper 20 20 (See FIG. 4) is preferably 150 mm or more and 240 mm or less, more preferably 170 mm or more and 220 mm or less, and still more preferably 190 mm or more and 210 mm or less.

[0054] - The length L in the direction orthogonal to the drawing direction of the sanitary tissue paper 20 - The length L in the direction (X direction) orthogonal to the drawing direction of the sanitary tissue paper 20 20 (See FIGS. 1 and 4) is preferably 160 mm or more and 260 mm or less, more preferably 180 mm or more and 240 mm or less, and still more preferably 200 mm or more and 220 mm or less.

[0055] The length L of the sanitary tissue paper 20 20 and W 20 By setting them within the above ranges, the height H of the present invention cThe storage box 11 having [the relevant feature] has a sheet width and length suitable for inserting the clip of the sanitary tissue paper 20 of the present invention, and has good drawability.

[0056] -Strength in the direction orthogonal to the drawing direction (DMDT)- In the sanitary tissue paper 20 of the present invention, the dry machine direction tensile strength (measured at a draw speed of 300 mm / min for 2 plies) DMDT (Dry Machine Direction Tensile strength) based on JIS P 8113 is preferably 2.8 N / 25 mm or more and 22 N / 25 mm or less, more preferably 3.4 N / 25 mm or more and 21 N / 25 mm or less, and still more preferably 3.9 N / 25 mm or more and 20 N / 25 mm or less. By setting DMDT within the above range, the softness is improved, and when the sanitary tissue paper 20 is taken out from the storage box 11, it is less likely to tear and is easy to take out. Also, wrinkles are less likely to occur during production.

[0057] -Strength in the drawing direction (DCDT)- The drawing direction of the sanitary tissue paper 20 of the present invention is the CD direction, and the dry cross direction tensile strength (measured at a draw speed of 300 mm / min for 2 plies) DCDT (Dry Cross Direction Tensile strength) is preferably 0.7 N / 25 mm or more and 6.5 N / 25 mm or less, more preferably 0.9 N / 25 mm or more and 6.0 N / 25 mm or less, and still more preferably 1.1 N / 25 mm or more and 5.5 N / 25 mm or less. By setting DCDT within the above range, the sanitary tissue paper 20 is less likely to tear during drawing, is easy to take out, and has good softness.

[0058] -Raw materials- The two-ply sheet that constitutes the sanitary tissue paper 20 is mainly composed of pulp, and preferably contains 50% by mass or more of pulp. Examples of the pulp that can be used in the production of the sanitary tissue paper 20 include wood pulp, waste paper pulp, and non-wood pulp. However, the sanitary tissue paper 20 in the present invention may consist of 100% wood pulp as the pulp, or may contain waste paper pulp or non-wood pulp in addition to the wood pulp. Examples of components other than pulp include fillers, synthetic fibers, and natural fibers. In order to obtain the target quality, it is preferable to use wood pulp composed of 10% by mass or more and 40% by mass or less of softwood kraft pulp (NBKP) and 60% by mass or more and 90% by mass or less of hardwood kraft pulp (LBKP) as raw materials. More preferably, it is composed of NBKP: 15% by mass or more and 35% by mass or less and LBKP: 65% by mass or more and 85% by mass or less of wood pulp as raw materials. Even more preferably, it is composed of NBKP: 20% by mass or more and 30% by mass or less and LBKP: 70% by mass or more and 80% by mass or less of wood pulp as raw materials.

[0059] As the species of the above LBKP, pulp produced from the genus Eucalyptus of the myrtle family, represented by Eucalyptus grandis and Eucalyptus globulus, is preferable. Also, with respect to 100 parts by mass of the wood pulp having the above pulp ratio, up to about 50 parts by mass of waste paper pulp may be contained. Since the quality of waste paper pulp varies greatly and the quality of the product, especially softness, is greatly affected as the blending ratio increases, it is preferable that the blending amount with respect to the wood pulp is 30 parts by mass or less, more preferably 15 parts by mass or less, even more preferably 5 parts by mass or less, and most preferably no waste paper pulp is blended. As the waste paper pulp, that derived from paper liquid beverage containers such as milk storage boxes is preferable.

[0060] In addition, in order to ensure appropriate strength for the sanitary tissue paper 20, after blending the raw materials by ordinary means, the strength can be adjusted by beating the pulp fibers. As the beating treatment for obtaining the target quality, it is preferable that the drainage degree (csf) of the raw material in the seed box is 350 ml or more and 650 ml or less, preferably 400 ml or more and 600 ml or less, and more preferably 450 ml or more and 550 ml or less. Note that a dry paper strength enhancer may be used, and it is preferable to use a wet paper strength enhancer. By adjusting the pulp composition and drainage degree as described above, the sanitary tissue paper having appropriate strength and being easy to pull out can be obtained for the storage box 11 without a film as in the present invention.

Example

[0061] Using the parameters shown in Table 1, storage boxes containing film-less sanitary tissue paper of Examples and Comparative Examples were produced. The shape of the lid part was as shown in FIG. 1, and the double perforation part was provided only at the central part in FIG. 6. In addition, the tab position of Comparative Example 2 being "end" indicates the position shown in FIG. 11. For the sanitary tissue paper, a two-ply 160-set tissue paper with a basis weight of 10.4 g / m 2 was used and stacked in a V-shape in the storage box as shown in FIG. 2 using a multi-stand type interfolder. The height of the storage box was 45 mm to 65 mm.

[0062] [Evaluation] For Examples and Comparative Examples, sensory evaluations were performed on the following items. The evaluation results are shown in Table 1.

[0063] (Degree of damage to the storage box at the time of opening) Thirty monitors opened the lid parts of the storage boxes containing sanitary tissue paper of Examples and Comparative Examples, five boxes each, and evaluated the occurrence rate of delamination between layers of the storage box around the lid part by the following formula. Occurrence rate (%) = Number of occurrences of delamination / (30 people × 5 pieces) × 100 The evaluation criteria are as follows. A: 0% or more and less than 2% B: 2% or more and less than 5% C: 5% or more

[0064] (Unintentional perforation damage) Using 1000 storage boxes for the examples and comparative examples, the occurrence rate of perforation breakage in the lid part was obtained and evaluated by the following formula. Occurrence rate (%) = Number of man-hours of perforation breakage / 1000 × 100 A: 0% or more and less than 0.5% B: 0.5% or more and less than 1.0% C: 1.0% or more

[0065] (Suppression of dropout) Thirty monitors evaluated the occurrence rate of dropout for the storage boxes containing sanitary tissue paper in the examples and comparative examples by taking out all the sheets one by one from each box and using the following formula. Occurrence rate (%) = Number of occurrences of dropout / (30 people × 1 piece) × 100 A: 0% or more and less than 1% B: 1% or more and less than 1.5% C: 1.5% or more

[0066] [Table 1]

[0067] As shown in Table 1, even for a storage box containing sanitary tissue paper with a low basis weight, a small short-side dimension of the extraction opening, and a film-less design that opens from the center of the lid to both sides, no damage to the storage box occurred during opening, and no unintentional perforation damage occurred, resulting in good results. In addition, since the short-side dimension of the extraction opening of the present invention is short, dropout can be suppressed.

Explanation of symbols

[0068] 10 Storage box containing sanitary tissue paper 11 Storage box 11a Top surface 12 First perforation 13 Extraction opening 14 Lid part 15 Opening tab 16 Second perforation 17th third sewing line 18 Both ends 18a End 20 Sanitary tissue paper 21 Fold line 30 Central double sewing line part 30a, 31a, 32a Outer sewing lines 30b, 31b, 32b Inner sewing lines 31 Left double sewing line part 32 Right double sewing line part A Central part B1, B2 Longitudinal openings H C Height of storage box X Longitudinal direction Y Transverse direction L 13 Length in the longitudinal direction of the extraction opening W a Length in the transverse direction at the central part W b Length in the transverse direction at both ends L 15 Length in the longitudinal direction of the opening tab W 15 Length in the transverse direction of the opening tab W 20 Length in the extraction direction of the sanitary tissue paper L 20 Length in the direction perpendicular to the extraction direction of the sanitary tissue paper

Claims

1. A storage box containing sanitary tissue paper, the storage box with sanitary tissue paper having no film at the outlet thereof, wherein the outlet has a shape extending in the longitudinal direction of the storage box, and has a substantially elliptical central portion and a substantially strip-shaped longitudinal opening having two parallel sides extending from both side edges of the central portion to both sides in the longitudinal direction of the storage box, and the maximum value Wa of the length region in the short direction at the central portion is larger than the maximum value Wb of the length region in the short direction at both ends of the longitudinal opening, the outlet has a lid portion surrounded by a first perforation and closing the outlet, the lid portion consists of a central lid portion closing the central portion of the outlet and a longitudinal opening lid portion closing the longitudinal opening of the outlet, a pair of second perforations extending from each of the two first perforations in the direction of the center of the central portion so as to divide the central lid portion of the lid portion into two in the longitudinal direction, and a third perforation forming an opening tab which connects between the pair of second perforations and draws a curve bulging in the longitudinal direction of the central lid portion, The basis weight of the storage box is 230 g / m ２ or more and 340 g / m ２ or less, and the length of the storage box in the longitudinal direction is 200 mm or more and 260 mm or less, and the length in the short direction is 90 mm or more and 130 mm or less, the extraction direction of the sanitary tissue paper is the CD direction, the length in the short direction at both ends of the longitudinal opening is 8 mm or more and 30 mm or less, the first perforation consists of an inner perforation and an outer perforation arranged outside the inner perforation in a range of minus 9% or more and plus 9% or less with respect to the length in the longitudinal direction, based on the center in the longitudinal direction of the lid portion, and each cutting portion is arranged in a staggered manner, and has a double perforation portion, the double perforation portion consists of a central double perforation portion formed along the edge of the central lid portion, a left double perforation portion and a right double perforation portion formed along the edge of the longitudinal opening, the central double perforation portion, the left double perforation portion and the right double perforation portion are not formed in the R-shaped portion which is the connection portion between the central portion and the longitudinal opening, and the left double perforation portion and the right double perforation portion are formed only on the two parallel sides of the longitudinal opening A storage box with sanitary tissue paper.

2. The storage box with sanitary tissue paper according to claim 1, wherein the cutting width of the outer perforation is 0.3 mm or more and 1.2 mm or less, and the cutting width of the inner perforation is 0.5 mm or more and 1.5 mm or less.

3. The storage box for sanitary tissue paper according to claim 1 or 2, wherein the ratio of the total length of the double perforation part to the perimeter of the extraction opening is 20% or more and 90% or less.

4. The storage box for sanitary tissue paper according to any one of claims 1 to 3, wherein the lid is opened on both sides in the longitudinal direction from the center of the extraction opening.

5. The opening tab is a semi-circular or semi-elliptical pushing piece, The storage box for sanitary tissue paper according to any one of claims 1 to 4, wherein the length of the opening tab in the longitudinal direction is 10 mm or more and 30 mm or less, and the length in the short transverse direction is 14 mm or more and 30 mm or less.

6. The storage box for sanitary tissue paper according to claim 5, wherein the radius R of the curved part of the pushing piece is 7 mm or more and 15 mm or less.

7. The storage box for sanitary tissue paper according to any one of claims 1 to 6, wherein the number of sets of the sanitary tissue paper is 100 sets or more and 260 sets or less.

8. The storage box for sanitary tissue paper according to any one of claims 1 to 7, wherein the length of the sanitary tissue paper in the pulling-out direction is 150 mm or more and 240 mm or less, and the length in the direction perpendicular to the pulling-out direction of the sanitary tissue paper is 160 mm or more and 260 mm or less.

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