Toilet paper package

Abstract

This toilet paper package includes a sheet stacked body which is obtained by stacking, in a pop-up manner, a plurality of sets of toilet paper, each set comprising a two-ply sheet, and a packaging bag which is made of a resin film and which has a removal opening formed in a top surface, the sheet stacked body being stored in the packaging bag, wherein the basis weight per single ply of the sheet is 10 g / m2 or more and 20 g / m2 or less, and the static friction coefficient between the two-ply sheets is 1.1 or more and 1.45 or less.

Description

Toilet paper packaging

[0001] The present invention relates to a toilet paper package.

[0002] Conventional toilet paper is commonly available in roll form, in which a long piece of tissue paper is wound around a core (see, for example, Patent Document 1). This roll-type toilet paper is time-consuming to use, as it requires both hands to stack and roll up the cut pieces of tissue paper. To reduce this time-consuming process, there is a technology in which a stacked toilet paper, in which multiple pre-cut sheets of tissue paper are stacked, is placed in a container and used (see, for example, Patent Document 2).

[0003] Japanese Patent No. 7312282 Japanese Patent Application Laid-Open No. 2010-22799

[0004] However, laminated toilet paper has little paper damping during production, and does not have the softness and smoothness of roll-type toilet paper. Furthermore, while laminated toilet paper can be made softer and smoother by weakening its paper strength, the friction between the sheets of paper decreases, resulting in a decrease in pop-up properties (the property whereby when one sheet of toilet paper is taken out of the outlet, part of the next sheet of toilet paper is pulled out of the outlet).

[0005] Furthermore, although laminated toilet paper can be tightly packed in a packaging bag made of resin film to prevent a decrease in pop-up properties, when removing the toilet paper from the opening, the toilet paper may tear, fall into the packaging bag, or the packaging bag may lift up, reducing its ease of removal.

[0006] An object of the present invention is to provide a toilet paper package in which laminated toilet paper is packaged in a film, which has excellent pop-up properties and easy removal.

[0007] The toilet paper according to one aspect of the present disclosure is a toilet paper package comprising a sheet stack formed by stacking a plurality of toilet paper sheets, each consisting of a set of two plies, in a pop-up style, and a packaging bag made of a resin film and having an opening formed on the top surface thereof for accommodating the sheet stack, wherein the basis weight per ply of the sheet is 10 g / m ２ 20g / m or more ２ The coefficient of static friction between the sheets of the two plies is 1.1 or more and 1.45 or less.

[0008] According to one aspect of the present invention, it is possible to provide a toilet paper package in which laminated toilet paper is packaged in a film, which has excellent pop-up properties and easy removal.

[0009] Fig. 1 is a diagram showing a toilet paper package according to an embodiment; Fig. 2 is a diagram showing an example of layered toilet paper that constitutes a toilet paper package; Fig. 3 is a diagram showing toilet paper sheets stacked in a pop-up style; Fig. 4 is a diagram showing a two-ply sheet that constitutes toilet paper; Fig. 1 is a diagram showing the toilet paper package of Fig. 1 in use; Fig. 2 is a diagram showing the toilet paper package of Fig. 1 when viewed from the top; Fig. 3 is a diagram showing the toilet paper package of Fig. 1 in use; Fig. 4 is a diagram showing the toilet paper package of Fig. 1 when viewed from the top; Fig. 5 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 5 is a diagram showing the toilet paper package of Fig. 1 when viewed from the top; Fig. 6 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 6 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 7 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 7 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 8 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 8 is a diagram showing the toilet paper package of Fig. 1 when used; Fig. 9 is a diagram showing the toilet paper package of Fig. 1 stacked in a pop-up style; Fig. 9 is a diagram showing the toilet paper package of Fig. 1 stacked in a pop-up style; Fig. 10 is a diagram showing the toilet paper package of Fig. 1 stacked in a pop-up style; Fig. 11 is a diagram showing the toilet paper package of Fig. 1 stacked in a pop-up style; Fig. 12 is a diagram showing the toilet paper package of Fig. 1 stacked in a pop-up style; Fig. 13 is a diagram showing the toilet paper package of Fig. 1 stacked in a pop-up style; Fig. 14 is a diagram showing the toilet paper package of Fig. 1 stacked in a

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Common parts in the drawings will be given the same reference numerals and their explanations may be omitted. Also, the scale of each member in each drawing may differ from the actual scale.

[0011] In this specification, the directions of the drawings are explained using a three-dimensional Cartesian coordinate system with three axial directions (X direction, Y direction, Z direction). In each drawing, the left-right direction (the longitudinal direction of the toilet paper package or toilet paper stack) is the X direction, the front-rear direction (the lateral direction of the toilet paper package or toilet paper stack) is the Y direction, and the up-down direction (the height direction of the toilet paper package or toilet paper stack) is the Z direction.

[0012] In this specification, deviations in each direction are permitted to the extent that they do not impair the functions and effects of the embodiments. Note that perpendicular may include substantially perpendicular.

[0013] Fig. 1 is a diagram showing a toilet paper package according to an embodiment. Fig. 2 is a diagram showing an example of layered toilet paper that constitutes the toilet paper package. Fig. 3 is a diagram showing toilet paper sheets stacked in a pop-up style. Fig. 4 is a diagram showing a two-ply sheet that constitutes the toilet paper. Fig. 5 is a diagram showing Fig. 1 as viewed from the top. Fig. 6 is a diagram showing the toilet paper package of Fig. 1 in use.

[0014] As shown in Figure 1, the toilet paper package 100 of the present disclosure has a toilet paper laminate 10 and a packaging bag 20 made of a resin film. In this specification, the toilet paper laminate may be referred to as laminated toilet paper or toilet paper laminate. Also, the packaging bag made of a resin film may be referred to as a film packaging bag.

[0015] In this embodiment, as shown in Fig. 1, the shape of the toilet paper laminate 10 is a rectangular parallelepiped, and the toilet paper laminate 10 is contained in a packaging bag 20 so that the stacking direction LD of the toilet paper 10A is the height direction (Z direction). As shown in Fig. 6, the toilet paper laminate 10 is designed so that the toilet paper 10A can be pulled out one sheet at a time (or one set at a time) through an outlet 30 formed on the top surface 21 of the packaging bag 20.

[0016] The toilet paper stack 10 is made up of multiple toilet paper rolls 10A stacked in a pop-up style, each roll consisting of a set of two-ply sheets S1 and S2. Here, a two-ply sheet refers to two sheets S1 and S2 stacked together, as shown in Figure 4. The pop-up style refers to a configuration in which, when a roll of toilet paper is removed from the outlet, a portion of the next roll of toilet paper is pulled out and held in the outlet.

[0017] The toilet paper laminate 10 is an example of a sheet laminate in the toilet paper package of the present invention. The toilet paper 10A is an example of a set of two-ply sheets that make up the toilet paper in the toilet paper package of the present invention.

[0018] As shown in FIG. 3, for example, in the pop-up toilet paper, each toilet paper 10A constituting the toilet paper stack 10 is folded in a mountain fold, and the toilet paper 10A is stacked alternately so that half of the inner surface IM1 of the mountain fold MF1 of one toilet paper TP1 faces and overlaps half of the inner surface IM2 of the mountain fold MF2 of the other toilet paper TP2.

[0019] The material of the sheet S constituting the toilet paper is not particularly limited, but is preferably tissue paper. Known compositions can be used as the pulp composition of the sheet S. The blending ratio of pulp can be, for example, 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0020] There are no particular limitations on the pulp composition of the sheet S. For example, softwood pulp such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp) can be used in any ratio.

[0021] The ratio of hardwood pulp to softwood pulp is not limited, but is preferably 10:90 to 80:20, and more preferably a pulp composition in which the ratio of hardwood pulp to softwood pulp is higher. Furthermore, recycled paper pulp may be used as the pulp contained in the sheet S.

[0022] The sheet S may contain a fabric softener. Here, the fabric softener contains a component that imparts flexibility to the sheet S that constitutes the toilet paper. Specifically, the fabric softener has the function of widening the spaces between the pulp fibers, forming air layers between the pulp fibers, and penetrating between the pulp fibers, loosening the pulp fibers and softening the sheet S. Furthermore, application of the fabric softener to the pulp surface reduces friction with the skin, making the sheet S smoother.

[0023] The crepe ratio of the sheet S is optional, but is preferably 20.0% or more and 24.8% or less, more preferably 20.5% or more and 24.5% or less, and even more preferably 21.0% or more and 24.0% or less. The crepe ratio is a value calculated based on the relationship between the Yankee dryer and the take-up reel used in producing the toilet paper sheet S, by ((peripheral speed of Yankee dryer) - (peripheral speed of take-up reel)) / (peripheral speed of Yankee dryer) x 100 (%). By adjusting the crepe ratio to 20.0% or more and 24.8% or less, it is possible to impart a fluffy feel and smoothness to the sheet S.

[0024] The basis weight of the sheet S is 10 g / m per ply. ２ 20g / m or more ２ or less, preferably 11 g / m ２ 19g / m or more ２ , more preferably 12 g / m ２ 18g / m or more ２ The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0025] The thickness of the sheet S is not particularly limited, and may be the paper thickness measured under the environment of JIS P 8111 (1998). For example, the thickness of the sheet S as a two-ply base paper is 100 μm or more and 400 μm or less, preferably 150 μm or more and 350 μm or less, and more preferably 200 μm or more and 300 μm or less.

[0026] The sheet S may be embossed. The embossing can be performed by a known embossing method. The embossing method is not particularly limited, and examples thereof include a steel rubber method and a steel match method. Among these, the steel match method is preferably used. Such embossing is preferably performed on toilet paper 10A composed of two plies of sheets S1 and S2.

[0027] When the toilet paper 10A is embossed, the ratio T / T0 of the thickness T of the toilet paper 10A after embossing to the thickness T0 of the toilet paper 10A before embossing is preferably 0.7 or more and 1.5 or less, more preferably 0.8 or more and 1.4 or less, and even more preferably 0.9 or more and 1.3 or less. The thickness T after embossing corresponds to the thickness of the toilet paper 10A when in use.

[0028] The water-disintegrability of the sheet S (ease of disintegration in water) is arbitrary, but from the viewpoint that the sheet S is used as toilet paper, the water-disintegrability of the sheet S is preferably 50 seconds (s) or less, more preferably 45 seconds (s) or less, and even more preferably 40 seconds (s) or less. Here, the water-disintegrability is determined by placing a rotor rotating at a predetermined number of revolutions in a container containing water, placing a test piece of the sheet in the rotor, and measuring the time [seconds (s)] until the test piece disintegrates.

[0029] The dimensions of the toilet paper stack 10 can be a length in the longitudinal direction (X direction) of 150 mm or more and 300 mm or less, a width in the transverse direction (Y direction) of 80 mm or more and 150 mm or less, and a height in the height direction or stacking direction (Z direction) of 30 mm or more and 150 mm or less.

[0030] The toilet paper laminate 10 is preferably stacked so that the direction in which the toilet paper 10A is pulled out is the MD direction. In this specification, the MD direction refers to the direction in which the fibers flow or the longitudinal direction (Y direction) during the production of the toilet paper.

[0031] The direction in which the sheet is pulled out is the MD direction, which means that the movement direction of the toilet paper 10A when the toilet paper 10A is pulled out from the outlet 30 of the toilet paper package 100 is the MD direction, and also means that the movement direction of the toilet paper 10A when it is in the state of the toilet paper stack 10 inside the toilet paper package 100 is the MD direction.

[0032] There are no particular limitations on the method for laminating the toilet paper laminate 10. The toilet paper laminate 10 can be manufactured using, for example, a rotary interfolder, a multi-stand interfolder, etc. The multi-stand interfolder is a device that produces a web by folding and alternately stacking sheets S with a single folding plate.

[0033] The dry tensile strength in the MD direction of the toilet paper 10A is preferably 250 cN or more and 400 cN or less, more preferably 260 cN or more and 395 cN or less, and even more preferably 270 cN or more and 390 cN or less. The dry tensile strength in the MD direction indicates the strength when the toilet paper is pulled in the MD direction in a dry state.

[0034] The dry tensile strength in the CD direction of the toilet paper 10A is arbitrary, for example, 90 cN or more and 200 cN or less, preferably 95 cN or more and 190 cN or less, and preferably 100 cN or more and 180 cN or less. Here, the CD direction refers to the direction perpendicular to the flow direction of the fibers during the production of the toilet paper, or the horizontal direction (X direction). The dry tensile strength in the CD direction refers to the strength when the toilet paper 10A is pulled in the CD direction in a dry state.

[0035] The elongation percentage in the MD direction of the toilet paper 10A is preferably 13% or more, more preferably 14% or more, and even more preferably 15% or more. The upper limit of the elongation percentage in the MD direction of the toilet paper 10A is arbitrary, but the practical upper limit is preferably 25% or less, more preferably 23% or less, and even more preferably 21% or less.

[0036] In this specification, the elongation rate in the MD direction is the length of the sheet S that is elongated when the toilet paper 10A is pulled in the MD direction in a dry state and breaks, expressed as a percentage of the original length of the sheet S before being pulled.

[0037] The CD elongation of the sheet S is 1% or more and 8% or less, preferably 2% or more and 7% or less, and more preferably 3% or more and 6% or less. Here, the CD elongation is the length of the sheet S that is elongated when the toilet paper 10A is pulled in the CD direction in a dry state and breaks, expressed as a percentage of the original length of the sheet S before being pulled.

[0038] The packaging bag 20 is made of a resin film. The resin film that constitutes the packaging bag 20 is flexible. There are no particular limitations on the resin used for the resin film, and examples that can be used include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), polyamide (PA), and other resins. As the polyethylene, high-density polyethylene, low-density polyethylene, and the like can be used.

[0039] Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible, easy to handle, have high heat-sealing properties, and are inexpensive. Polyethylene is also preferred because it is odorless, has excellent water resistance and chemical resistance, and can be mass-produced at low cost. Polypropylene is also preferred because it is robust, easy to mold, has good color development when printed, and can be imparted with gloss.

[0040] In addition, the materials used to form the packaging bag 20 can be biodegradable materials (biodegradable plastics such as polylactic acid, etc.) or biomass materials (renewable organic resources derived from living organisms, such as biomass film, excluding fossil resources).

[0041] The form of the resin film forming the packaging bag 20 is not particularly limited, and may be a single-layer film formed of a single layer of the above-mentioned resin, a laminate film in which the above-mentioned resin is laminated, a film in which the above-mentioned resin is bonded or laminated with pulp paper or nonwoven fabric, or a mixed film formed from a mixture of two or more of the above-mentioned resins.

[0042] The thickness of the resin film forming the packaging bag 20 is not particularly limited, and is preferably 20 μm or more and 100 μm or less, more preferably 25 μm or more and 70 μm or less, and even more preferably 30 μm or more and 50 μm or less. By making the thickness of the resin film 20 μm or more, sufficient strength can be ensured as the packaging bag 20 in which the toilet paper laminate 10 is contained. Furthermore, by making the thickness of the resin film 100 μm or less, flexibility of the packaging bag 20 can be ensured and weight can be reduced.

[0043] Furthermore, there are no particular limitations on the packaging form of the packaging bag 20. In this embodiment, for example, packaging in which both ends or either one end of a tubular resin film folded in a gusset shape are sealed (pillow packaging), packaging in which both ends of a tubular resin film are folded and sealed (caramel packaging), packaging in which a heat-shrinkable resin film is heated to adhere closely to the packaged object (shrink packaging), or a combination of these may be employed.

[0044] Among these, pillow packaging is preferred as the packaging form of the packaging bag 20, since it is easy to control the compaction of the toilet paper stack 10.

[0045] In pillow packaging, the toilet paper laminate 10 to be packaged is wrapped in a resin film by rolling it up in the short direction (Y direction), the overlapping edges in the rolling direction are glued together, and then both ends (sides 25, 26 of the packaging bag 20) that extend beyond the packaged item in the longitudinal direction (X direction) are folded in a gusset shape and sealed.

[0046] The packaging bag 20 contains the toilet paper stack 10.

[0047] As shown in Fig. 1 , the packaging bag 20 has a top surface 21, a bottom surface 22, a front surface 23, a back surface 24, side surfaces 25, and a side surface 26 when the toilet paper laminate 10 is stored therein. In the present disclosure, in the packaging bag 20, the top surface 21 and the bottom surface 22 face each other in the up-down direction (Z direction), the front surface 23 and the back surface 24 face each other in the front-to-back direction (Y direction), and the side surfaces 25 and 26 face each other in the left-to-right direction (X direction). The side surfaces 25 and 26 are continuous with all of the top surface 21, the bottom surface 22, the front surface 23, and the back surface 24.

[0048] The toilet paper laminate 10 contained in the packaging bag 20 has a top surface 11, a bottom surface 12, a long side surface 13, a long side surface 14, a short side surface 15, and a short side surface 16 that face the top surface 21, a bottom surface 22, a front surface 23, a back surface 24, a side surface 25, and a side surface 26 of the packaging bag 20, respectively.

[0049] The top surface 21 of the packaging bag 20 is provided with an outlet 30. The outlet 30 allows the toilet paper 10A to be pulled out. The outlet 30 is configured as an opening OP. The opening OP that forms the outlet 30 may be configured by tearing a perforation (intermittent cut) M, as shown in Figures 1, 5, and 6.

[0050] The shape of the opening OP constituting the outlet 30 is not particularly limited, and may be, for example, a straight line, an elongated rectangle, an ellipse, a truck shape, a gourd shape (or a dumbbell shape) or the like in a plan view. Here, the gourd shape (or a dumbbell shape) refers to an ellipse with a narrowed center. Among these, a straight line, an ellipse, a truck shape, and a gourd shape (or a dumbbell shape) are preferred, more preferably a truck shape or a gourd shape (or a dumbbell shape), and even more preferably a gourd shape (or a dumbbell shape).

[0051] As shown in Figures 1, 5, and 6, the outlet 30, which is gourd-shaped (or dumbbell-shaped) in plan view, has a shape in which the width of the central portion 31 of the outlet 30 is narrower than the width of the ends 32, 33 of the outlet 30. The shape of the central portion 31 of the outlet 30 is not particularly limited, but may be, for example, an elongated rectangle. The shapes of the ends 32, 33 of the outlet 30 are not particularly limited, but may be, for example, a fan shape.

[0052] When the outlet 30 is gourd-shaped (or dumbbell-shaped) in a planar view, the width (width in the Y direction) of the central portion 31 of the outlet 30 is not particularly limited, but is preferably 1 mm or more and 10 mm or less, more preferably 3 mm or more and 8 mm or less, and more preferably 4 mm or more and 6 mm or less.

[0053] The width (maximum width in the Y direction) of both ends 32, 33 of outlet 30 is not particularly limited, but is preferably 5 mm or more and 50 mm or less, more preferably 10 mm or more and 45 mm or less, and more preferably 15 mm or more and 40 mm or less.

[0054] The ratio of the width (width in the Y direction) of the central portion 31 of the outlet 30 to the width (maximum width in the Y direction) of both ends 32, 33 of the outlet 30 is not particularly limited, but is preferably 5% or more and 40% or less, more preferably 7% or more and 30% or less, and even more preferably 10% or more and 25% or less.

[0055] The total length of the outlet 30 in the longitudinal direction (X direction) is not particularly limited, and is, for example, 40% or more and 100% or less of the total length of the top surface 21 of the packaging bag 20 of the toilet paper package 100 in the longitudinal direction (X direction), preferably 45% or more and 90% or less, and more preferably 50% or more and 80% or less.

[0056] The ratio of the length of the central portion 31 of the outlet 30 in the longitudinal direction (X direction) to the total length of the outlet 30 in the longitudinal direction (X direction) is not particularly limited, but is preferably 35% or more and 75% or less, more preferably 40% or more and 70% or less, and even more preferably 45% or more and 65% or less.

[0057] The ratio of the length of each of the end portions 32, 33 of the outlet 30 in the longitudinal direction (X direction) to the total length of the outlet 30 in the longitudinal direction (X direction) is not particularly limited, but is preferably 5% or more and 45% or less, more preferably 10% or more and 30% or less, and even more preferably 15% or more and 25% or less.

[0058] In the toilet paper packaging 100 of the present disclosure, the static friction coefficient F1 between one toilet paper 10A and the other toilet paper 10A that make up the toilet paper laminate 10 (the static friction coefficient between toilet paper sheets) is 1.1 or more and 1.45 or less, preferably 1.15 or more and 1.4 or less, and more preferably 1.2 or more and 1.37 or less.

[0059] In this specification, the coefficient of static friction refers to the ratio of the frictional force generated at the contact surface between two objects when they are not in relative motion to the force acting perpendicular to the contact surface. The coefficient of static friction is measured in accordance with the horizontal method of JIS P 8147 (2010). In this embodiment, as shown in Figure 3, the coefficient of static friction F1 is measured between the inner surface IM1 of the mountain fold MF1 of toilet paper TP1 and the inner surface IM2 of the mountain fold MF2 of toilet paper TP2.

[0060] In the toilet paper package 100 of the present disclosure, the static friction coefficient F2 between one ply of sheets S constituting one toilet paper sheet 10A and the other ply of sheets S constituting the other toilet paper sheet 10A (the static friction coefficient between sheets of one ply) is preferably 1.2 or more, more preferably 1.21 or more, and even more preferably 1.22 or more. The upper limit of the static friction coefficient F2 is arbitrary, but in order to maintain the softness of the toilet paper, it is preferably 3.0 or less, more preferably 2.0 or less, and even more preferably 1.5 or less.

[0061] In this embodiment, as shown in FIG. 4, when one toilet paper TP1 (10A) is separated into each sheet S11, S12, the static friction coefficient F2 is measured between the surface ES1 of one sheet S11 or sheet S12 (the surface corresponding to the outer surface of one toilet paper TP1) and the surface ES2 of one sheet S21 or sheet S22 (corresponding to the outer surface of the other toilet paper TP2) when the other toilet paper TP2 (10A) is separated into each sheet S21, S22.

[0062] In the toilet paper package 100 of the present disclosure, the static friction coefficient F3 between the toilet paper 10A and the packaging bag 20 is preferably 0.31 or less, more preferably 0.305 or less, and even more preferably 0.30 or less. Note that the lower limit of the static friction coefficient F3 here is arbitrary, but the practical lower limit is 0.01 or more, preferably 0.05 or more, and more preferably 0.1 or more.

[0063] In this embodiment, the static friction coefficient F3 between the outer surface OM1 of the mountain fold MF1 of the toilet paper TP1 of the toilet paper 10A as shown in FIG. 3 and the film that constitutes the packaging bag 20 is measured.

[0064] In the toilet paper package 100 of the present disclosure, the removal resistance value of the toilet paper 10A constituting the toilet paper laminate 10 is preferably 1 N or less, more preferably 0.9 or less, and even more preferably 0.8 or less. The lower limit of the removal resistance value is arbitrary, but the practical lower limit is 0.1 or more, preferably 0.15 or more, and more preferably 0.2 or more.

[0065] In this specification, the removal resistance value refers to the maximum resistance value that occurs when the toilet paper 10A is pulled up vertically from the removal opening 30 of the packaging bag 20 of the fixed toilet paper package 100 until the toilet paper 10A is pulled out of the packaging bag 20. The removal resistance value is also the average value of the maximum resistance values ​​from the second set to the tenth set.

[0066] As described above, the toilet paper package 100 of this embodiment has a basis weight of 10 g / m per ply of the sheet S constituting the toilet paper 10A. ２ 20g / m or more ２ Hereinafter, when the static friction coefficient F1 between one toilet paper 10A and the other toilet paper 10A constituting the toilet paper laminate 10 is 1.1 or more and 1.45 or less, a soft, smooth, laminated toilet paper is obtained that is housed in a film.

[0067] In addition, the toilet paper package 100 of this embodiment has excellent pop-up properties and ease of removal because frictional force is generated between the toilet paper sheets 10A when the toilet paper sheets 10A stacked in a pop-up manner are removed.

[0068] In the toilet paper package 100 of the present disclosure, the static friction coefficient F2 between one single-ply sheet S11 constituting one toilet paper 10A and the other single-ply sheet S21 constituting the other toilet paper 10A is 1.2 or more, thereby improving the pop-up property and removal property of the obtained toilet paper package 100.

[0069] In the toilet paper package 100 of the present disclosure, the static friction coefficient F3 between the toilet paper 10A and the packaging bag 20 is 0.31 or less, which further improves the pop-up property and removal property of the obtained toilet paper package 100.

[0070] In the toilet paper package 100 of the present disclosure, the dry tensile strength of the toilet paper 10A in the MD direction (Y direction) is 250 cN or more and 400 cN or less, which improves the pop-up property and take-out property of the obtained toilet paper package 100, while making the toilet paper 10A contained therein tear-resistant, soft, and smooth.

[0071] In the toilet paper package 100 of the present disclosure, the elongation rate of the toilet paper 10A in the MD direction (Y direction) is 13% or more, which improves the pop-up property and take-out property of the obtained toilet paper package 100, while making the toilet paper 10A contained therein even more tear-resistant, soft, and smooth.

[0072] In the toilet paper package 100 of the present disclosure, the toilet paper 10A has a take-out resistance value of 1 N or less, so that a toilet paper package 100 with excellent take-out properties can be reliably obtained.

[0073] In the toilet paper package 100 of the present disclosure, when the toilet paper 10A is embossed, the ratio T / T0 of the thickness T after embossing to the thickness T0 before embossing in the laminated toilet paper 10A is 0.7 or more and 1.5 or less, thereby ensuring that a toilet paper package 100 with excellent pop-up properties is obtained.

[0074] The present invention will be described in more detail below with reference to examples. The examples and comparative examples were evaluated by the following tests.

[0075] [Toilet Paper Package] As shown in Figures 1 and 2, a toilet paper package 100 was prepared in which a toilet paper laminate 10, in which multiple sets of toilet paper 10A, each set consisting of two plies of sheet S, are stacked in a pop-up style so that the direction in which the sheets S are pulled out is the MD direction, is contained in a packaging bag 20 made of polyethylene film and has a take-out opening 30 formed on the top surface 21.

[0076] [Basis Weight] The basis weight (basis weight) per ply of the sheet was measured in accordance with the provisions of JIS P 8124. The unit of basis weight is g / m ２ The measurement of the basis weight was carried out in a constant temperature and humidity environment (temperature 23°C, humidity 50%).

[0077] [Dry Tensile Strength] The dry tensile strength of the toilet paper was measured in accordance with the provisions of JIS P 8113 (1998). The toilet paper was cut to a width of approximately 25 mm (±0.5 mm) x length of approximately 150 mm in both the longitudinal direction (MD) and the transverse direction (CD). The tester used was a tension-compression tester (TG-200N, manufactured by Minebea Co., Ltd.). The measurement was performed by setting the grip spacing to 100 mm, clamping both ends of the test piece to the grips of the tester, applying a tensile load in the vertical direction to the toilet paper piece, and reading the indicated value (digital value) when the toilet paper broke. The tensile speed in the MD direction was 100 mm / min, and the tensile speed in the CD direction was 50 mm / min. Five sets of toilet paper were prepared in each of the MD and CD directions, and measurements were taken five times each. The average of the measured values ​​was used as the dry tensile strength in each direction.

[0078] [Elongation] A universal tension and compression tester (TG-200N, manufactured by Minebea Co., Ltd.) was used to measure the elongation in the longitudinal direction (MD direction) and transverse direction (CD direction) of one set of toilet paper 10A. The elongation is the length of the sheet S stretched when the toilet paper 10A is pulled in a predetermined direction in a dry state and broken, expressed as a percentage of the original length of the sheet S before being pulled. Five sets of toilet paper 10A were prepared in both the MD direction and the CD direction, and measurements were taken five times each, and the average of the measurements was used as the elongation in each direction.

[0079] [Water-disintegrability] The water-disintegrability of toilet paper was measured. Test pieces of toilet paper were prepared by cutting them into 114 mm ± 2 mm in both the machine direction (MD) and the cross direction (CD). The test pieces were peeled off to form one ply and cured at 105 ° C for 3 minutes. Meanwhile, a rotor was placed in a beaker containing 300 ml of water, placed on a magnetic stirrer, and the rotor rotation speed was adjusted to 600 ± 10 rpm. A disk-shaped rotor with a diameter of 35 mm was used. Once the rotation speed stabilized, the test piece was placed in the beaker, and a stopwatch was pressed to start measuring the time. The rotation speed temporarily decreased due to the resistance of the test piece, and as the test piece unraveled, the rotation speed increased. When the rotation speed recovered to 540 rpm, the stopwatch was stopped and the time was measured in seconds (s) to evaluate the water-disintegrability. Water-disintegrability was evaluated as good if it took 50 seconds (s) or less, and poor if it took more than 50 seconds (s).

[0080] [Embossing] Embossing was performed on a steel match roll with the following embossing conditions: a nearly square top shape, a top side of 1.0±0.05 mm, a pitch between adjacent tops of 3.5 mm, a top height of 1.0±0.05 mm, a side inclination angle of 36.9°, and a radius of the curve between the top and side of 0.2 mm.

[0081] [Paper Thickness] Using a thickness measuring device (PEACOCK Dial Thickness Gauge G-30, manufactured by Ozaki Seisakusho Co., Ltd.), the thickness was measured at three points per set of toilet paper under the condition of N = 6, and the average value was calculated as the paper thickness. The paper thickness was measured before embossing (before embossing) and after embossing (after embossing), and the ratio of the thickness after embossing to the thickness before embossing was calculated.

[0082] [Static friction coefficient between toilet paper sheets] Two sets of toilet paper sheets were successively removed from the toilet paper laminate, and the static friction coefficient between the inner folds of the toilet paper sheets was measured as shown in Figure 3. The toilet paper sheets were cut to an arbitrary size to make two test pieces. Of the two test pieces, one was set on the test stand and the other on the weight. The test pieces were set stretched so as not to bend during measurement. The static friction coefficient of the test pieces once set was measured. A universal tension and compression testing machine (Shimadzu Corporation, Autograph AGS-500B) was used to measure the static friction coefficient between toilet paper sheets. The static friction coefficient between toilet paper sheets was measured using the horizontal method in accordance with JIS P8147, with a weight of 133 g and a moving speed of 10 mm / min. The measurement was performed with N = 5, and the average value was calculated as the static friction coefficient between the toilet paper sheets.

[0083] [Coefficient of static friction between sheets] Two sets of toilet paper were successively removed from the toilet paper laminate, and the coefficient of static friction between one of the sheets (the surface corresponding to the outer surface of one of the toilet paper sheets) when one of the toilet paper sheets was separated into its individual sheets was measured, and the surface of one of the sheets (the surface corresponding to the outer surface of the other toilet paper sheet) when the other toilet paper sheet was separated into its individual sheets was measured. Each sheet was cut to an arbitrary size to prepare a test specimen. For each test specimen, one sheet was set on the test table and the other sheet was set on a weight. Each test specimen was set up taut so as not to bend during measurement. The coefficient of static friction was measured for each test specimen after installation. A universal tension and compression testing machine (Shimadzu Corporation, Autograph AGS-500B) was used to measure the coefficient of static friction. The measurement of the coefficient of static friction between sheets was carried out in accordance with JIS P8147 using the horizontal method, with a weight of 133 g and a moving speed of 10 mm / min. Measurements were carried out with N=5, and the average value was calculated as the static friction coefficient between the sheets.

[0084] [Static friction coefficient between toilet paper and packaging bag (film)] A set of toilet paper sheets was continuously removed from the toilet paper laminate, and the static friction coefficient between each toilet paper sheet and the film constituting the packaging bag was measured. The toilet paper and film were each cut to an arbitrary size to form test specimens. The toilet paper test specimen was set on a test stand, and the film test specimen was set on a weight. Each test specimen was stretched so as not to bend during measurement. The static friction coefficient was measured for the toilet paper test specimen and film test specimen once they were set. A universal tension and compression tester (Shimadzu Corporation, Autograph AGS-500B) was used to measure the static friction coefficient. The static friction coefficient was measured using a horizontal method in accordance with JIS P8147, with a weight of 133 g and a movement speed of 10 mm / min. Measurements were performed with N=5, and the average value was calculated as the static friction coefficient between the toilet paper and film.

[0085] [Removal Efficiency] The toilet paper package was set in a universal testing machine (Shimadzu Corporation, Autograph AG-X) so that the bottom did not move, and the toilet paper was pulled up vertically at a speed of 500 mm / min, and the maximum resistance value (removal resistance value) required until the toilet paper was pulled out of the toilet paper package was measured. The removal resistance value was taken as the average of the maximum resistance values ​​for the second to tenth sets. The removal efficiency was evaluated as good when the removal resistance value was 1 N or less, and poor when it was more than 1 N.

[0086] [Pop-up property] When removing the toilet paper from the first roll to the last roll, the toilet paper was checked for sagging, tearing, and lifting of the packaging bag. Each evaluation was performed according to the following criteria. If any one of sagging, tearing, or lifting was poor, the pop-up property was evaluated as poor.

[0087] [Sagging] 〇 (good): 5 times or less × (poor): more than 5 times [Tearing] 〇 (good): 0 times × (poor): 1 time or more [Lifting] 〇 (good): 2 times or less × (poor): 3 times or more

[0088] Examples and comparative examples will be described below.

[0089] [Example 1] The basis weight of the sheet per ply is 15.3 g / m ２ The dry tensile strength of the toilet paper in the MD direction was 344 cN, the dry tensile strength in the CD direction was 123 cN, the elongation in the MD direction was 19.5%, the elongation in the CD direction was 4.0%, the sheet size in the MD direction was 224 mm, the sheet size in the CD direction was 212 mm, the number of plies was 2, the number of sets was 130, the water disintegration time was 9 seconds (s), the thickness before embossing was 266 μm, the thickness after embossing was 243 μm, the ratio of the thickness after embossing to the thickness before embossing was 91%, the static friction coefficient between the toilet paper sheets was 1.25, the static friction coefficient between the sheets was 1.40, the static friction coefficient between the toilet paper and the film was 0.24, and the shape of the opening of the packaging bag was gourd-shaped (length 145 mm, width at the center 5 mm, width at both ends 35 mm) and the toilet paper package was produced and evaluated. The results are shown in Table 1.

[0090] [Example 2] The basis weight of the sheet per ply is 15.8 g / m ２ The dry tensile strength of the toilet paper in the MD direction was 324 cN, the dry tensile strength in the CD direction was 159 cN, the elongation in the MD direction was 19.4%, the elongation in the CD direction was 4.4%, the sheet size in the MD direction was 228 mm, the sheet size in the CD direction was 213 mm, the number of sets was 120 sets, the water disintegration time was 12 seconds (s), the thickness before embossing was 261 μm, the thickness after embossing was 315 μm, the ratio of the thickness after embossing to the thickness before embossing was 121%, the static friction coefficient between the toilet paper sheets was 1.36, the static friction coefficient between the sheets was 1.30, and the static friction coefficient between the toilet paper and the film was 0.30. Otherwise, the toilet paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0091] [Example 3] The basis weight of the sheet per ply is 15.8 g / m ２ The dry tensile strength of the toilet paper in the MD direction was 352 cN, the dry tensile strength in the CD direction was 124 cN, the elongation in the MD direction was 17.4%, the elongation in the CD direction was 3.4%, the sheet dimension in the MD direction was 226 mm, the sheet dimension in the CD direction was 212 mm, the thickness before embossing was 245 μm, the thickness after embossing was 273 μm, the ratio of the thickness after embossing to the thickness before embossing was 111%, the static friction coefficient between the toilet paper sheets was 1.24, the static friction coefficient between the sheets was 1.23, the static friction coefficient between the toilet paper and the film was 0.28, and the shape of the opening of the packaging bag was a linear slit (145 mm long). Otherwise, a toilet paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0092] [Example 4] The shape of the dispensing opening of the packaging bag was made into a truck shape (length 145 mm, width 5 mm). Except for this, a toilet paper package was produced and evaluated in the same manner as in Example 3. The results are shown in Table 1.

[0093] [Example 5] The shape of the opening of the packaging bag was gourd-shaped (length 145 mm, width at the center 5 mm, width at both ends 35 mm). Except for this, a toilet paper package was produced and evaluated in the same manner as in Example 3. The results are shown in Table 1.

[0094] [Comparative Example 1] The basis weight of the sheet per ply is 12.8 g / m ２ The dry tensile strength in the MD direction was 396 cN, the dry tensile strength in the CD direction was 87 cN, the elongation in the MD direction was 10.8%, the elongation in the CD direction was 10.9%, the sheet size in the MD direction was 200 mm, the sheet size in the CD direction was 225 mm, the number of plies was 3, the number of sets was 120, the water disintegration time was 39 seconds (s), the thickness (thickness in the embossed state) was 323 μm, the static friction coefficient between the toilet paper sheets was 1.38, the static friction coefficient between the sheets was 1.19, and the static friction coefficient between the toilet paper and the film was 0.32. The toilet paper laminate was placed in a paper carton instead of a packaging bag, and an oval opening (opening) was provided in the carton. This opening was covered with a polyethylene film, and a linear slit (131 mm long) was provided in the film. Otherwise, a toilet paper package was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0095] [Comparative Example 2] Basis weight per ply: 11.8 g / m ２ The dry tensile strength in the MD direction was 399 cN, the elongation in the MD direction was 12.4%, the elongation in the CD direction was 10.2%, the sheet size in the MD direction was 195 mm, the sheet size in the CD direction was 216 mm, the number of plies was 2, the number of sets was 180, the water disintegrability was 60 seconds (s) or more, the thickness (thickness without embossing) was 168 μm, the static friction coefficient between toilet paper sheets was 1.00, the static friction coefficient between sheets was 1.09, and the length of the opening slit was 172 mm. Otherwise, a toilet paper package was produced and evaluated in the same manner as in Comparative Example 1. The results are shown in Table 1.

[0096] [Comparative Example 3] Basis weight per ply: 12.6 g / m ２The dry tensile strength in the MD direction was 345 cN, the dry tensile strength in the CD direction was 84 cN, the elongation in the MD direction was 9.2%, the elongation in the CD direction was 6.3%, the sheet size in the MD direction was 214 mm, the sheet size in the CD direction was 214 mm, the number of sets was 100 sets, the water disintegration time was 17 seconds (s), the thickness (thickness in an embossed state) was 340 μm, the static friction coefficient between the toilet paper sheets was 1.49, the static friction coefficient between the sheets was 1.18, the static friction coefficient between the toilet paper and the film was 0.24, and the length of the opening slit was 140 mm. Otherwise, a toilet paper package was prepared and evaluated in the same manner as in Comparative Example 1. The results are shown in Table 1.

[0097]

[0098] As shown in Table 1, in Examples 1 to 5, the basis weight per ply of the sheet constituting the toilet paper was 10 g / m ２ 20g / m or more ２ The static friction coefficient between the toilet paper sheets was 1.1 or more and 1.45 or less, the static friction coefficient between the sheets was 1.2 or more, the static friction coefficient between the toilet paper and the packaging bag (film) was 0.31 or less, the dry tensile strength of the toilet paper in the MD direction was 250 cN or more and 400 cN or less, and the elongation rate of the toilet paper in the MD direction was 13% or more, and the toilet paper packages had good pop-up properties and easy removal.

[0099] On the other hand, in Comparative Examples 1 to 3, toilet paper packages that did not satisfy at least one of the following conditions had poor removal properties: the static friction coefficient between the toilet paper sheets was 1.1 or more and 1.45 or less, the static friction coefficient between the sheets was 1.2 or more, the static friction coefficient between the toilet paper and the packaging bag (film) was 0.31 or less, the dry tensile strength of the toilet paper in the MD direction was 250 cN or more and 400 cN or less, and the elongation rate of the toilet paper in the MD direction was 13% or more. Of these, Comparative Example 1 also had poor pop-up properties.

[0100] The above-disclosed embodiments include, for example, the following aspects.

[0101] The first aspect of this embodiment is a toilet paper package having a sheet stack formed by stacking a plurality of toilet paper sheets, each consisting of a set of two plies of sheets, in a pop-up style, and a packaging bag made of a resin film and having an opening formed on the top surface and containing the sheet stack, wherein the basis weight per ply of the sheet is 10 g / m ２ 20g / m or more ２ The coefficient of static friction between the sheets of the two plies is 1.1 or more and 1.45 or less.

[0102] In the first aspect, the basis weight per ply of the sheet constituting the toilet paper is 10 g / m ２ 20g / m or more ２ As described below, when the coefficient of static friction between the two ply sheets that make up the toilet paper is 1.1 or more and 1.45 or less, a toilet paper package containing soft, smooth, laminated toilet paper in a film is obtained. Furthermore, the obtained toilet paper package has excellent pop-up properties and ease of removal because friction occurs between the toilet paper sheets when removing the stacked toilet paper in a pop-up manner.

[0103] A second aspect of this embodiment is the toilet paper packaging according to the first aspect, wherein when the two-ply sheet is separated into two one-ply sheets, the static friction coefficient between the one-ply sheets is 1.2 or more.

[0104] In the second aspect, when the two-ply sheet constituting the toilet paper is separated into two one-ply sheets, the static friction coefficient between the one-ply sheets is 1.2 or more, thereby improving the pop-up property and removal property of the obtained toilet paper package.

[0105] A third aspect of this embodiment is the toilet paper package according to the first or second aspect, wherein the coefficient of static friction between the two-ply sheet and the packaging bag is 0.31 or less. In the third aspect, the coefficient of static friction between the two-ply sheet constituting the toilet paper and the packaging bag is 0.31 or less, which can further improve the pop-up property and take-out property of the obtained toilet paper package.

[0106] A fourth aspect of this embodiment is the toilet paper package according to any one of the first to third aspects, wherein the dry tensile strength in the MD direction of the two-ply sheet is 250 cN or more and 400 cN or less. In the fourth aspect, the dry tensile strength in the MD direction of the two-ply sheet constituting the toilet paper is 250 cN or more and 400 cN or less, which improves the pop-up property and take-out property of the obtained toilet paper package, while making the toilet paper contained therein tear-resistant, soft, and smooth.

[0107] A fifth aspect of this embodiment is the toilet paper package according to any one of aspects 1 to 4, wherein the two-ply sheet has an MD elongation rate of 13% or more. In the fifth aspect, the two-ply sheet constituting the toilet paper has an MD elongation rate of 13% or more, which improves the pop-up property and take-out property of the obtained toilet paper package, while making the toilet paper contained therein even more tear-resistant, soft, and smooth.

[0108] A sixth aspect of this embodiment is the toilet paper package according to any one of the first to fifth aspects, wherein the two-ply sheet has a take-out resistance value of 1 N or less. In the sixth aspect, since the two-ply sheet that constitutes the toilet paper has a take-out resistance value of 1 N or less, a toilet paper package with excellent take-out properties can be reliably obtained.

[0109] A seventh aspect of this embodiment is the toilet paper packaging according to any one of the first to sixth aspects, wherein the two-ply sheet is embossed, and the ratio of the thickness of the two-ply sheet after the embossing to the thickness before the embossing is 0.7 or more and 1.5 or less.

[0110] In the seventh aspect, the ratio of the thickness after embossing to the thickness before embossing in the two-ply sheet that constitutes the laminated toilet paper is 0.7 or more and 1.5 or less, thereby ensuring that a toilet paper package with excellent pop-up properties is obtained.

[0111] Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims.

[0112] This application claims priority based on Japanese Patent Application No. 2024-043629, filed on March 19, 2024, the entire contents of which are incorporated herein by reference.

[0113] 100 Toilet paper packaging 10 Toilet paper laminate 10A Toilet paper 11 Top surface 12 Bottom surface 13, 14 Long sides 15, 16 Short sides LD Stacking direction 10A, TP1, TP2 Toilet paper MF1, MF2 Mountain fold IM1, IM2 Inner surface OM1 Outer surface S, S1, S2, S11, S12, S21, S22 Sheet ES1, ES2 Surface 20 Packaging bag 21 Top surface 22 Bottom surface 23 Front surface 24 Back surface 25 Side surface 26 Side surface 30 Dispensing opening 31 Center portion 32, 33 End portion M Perforation OP Opening

Claims

1. A toilet paper package comprising a sheet stack formed by stacking multiple sets of toilet paper sheets in a pop-up style, each set consisting of two plies of sheets, and a packaging bag made of a resin film with an opening formed on the top surface to house the sheet stack, wherein the basis weight of each ply of the sheet is 10 g / m ２ 20g / m or more ２ or less, and the static friction coefficient between the sheets of the two plies is 1.1 or more and 1.45 or less.

2. The toilet paper package according to claim 1, wherein when the two-ply sheet is separated into two one-ply sheets, the coefficient of static friction between the one-ply sheets is 1.2 or more.

3. The toilet paper package according to claim 1, wherein the static friction coefficient between the two-ply sheet and the packaging bag is 0.31 or less.

4. The toilet paper package according to claim 1, wherein the dry tensile strength of the two-ply sheet in the machine direction is 250 cN or more and 400 cN or less.

5. The toilet paper package according to claim 1, wherein the two-ply sheet has an MD elongation of 13% or more.

6. The toilet paper package according to claim 1, wherein the two-ply sheet has a removal resistance of 1 N or less.

7. The toilet paper package according to any one of claims 1 to 6, wherein the two-ply sheet is embossed, and the ratio of the thickness of the two-ply sheet after the embossing to the thickness before the embossing is 0.7 or more and 1.5 or less.

Images