Multi-package

Abstract

To provide a multi-package where a plurality of tissue individually packaged products are packaged in a direction vertical to an exterior bag, a perforation is hard to be unintentionally cut when the tissue individually packaged products are packaged by the exterior bag, and the perforation is easy to be opened when the tissue individually packaged products are used.SOLUTION: A multi-package 5 includes tissue individually packaged products 1 in which a film packaging base material has one perforation for forming a tissue paper take-out port 14, and an exterior bag 50, wherein the number of the plurality of tissue individually packaged products is 3 or more and 8 or less, a density of a tissue laminate is 0.18 g / cm3 or more and 0.26 g / cm3 or less, a thickness of the film packaging base material is 22 μm or more and 72 μm or less, a bond ratio of the perforation is 10% or more and 70% or less, and the tissue laminate is formed by stacking 180 sets or more and 240 sets or less of two-ply tissue paper.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a multi-package in which a plurality of soft-pack type individually wrapped tissue packages are packed. [Background technology]

[0002] Thin paper such as tissues is usually sold in the form of a package of multiple sheets stacked together, and inexpensive soft pack types are becoming more common as sales packages for such thin paper. For example, Patent Document 1 discloses a multi-pack in which five such soft packs are packaged in an exterior film.

[0003] Important factors for these soft pack-type individually wrapped tissues (hereafter referred to as "soft packs") are that they are compact and have low production costs. Generally, methods for reducing costs include increasing the number of tissues per soft pack to reduce the cost per sheet of tissue paper, reducing the thickness of the film used as the packaging base for soft packs, and packaging tightly to reduce logistics costs.

[0004] For example, if the number of tissue sets per soft pack is increased and the tissue laminate is tightly packed, the soft pack becomes compact. On the other hand, if the thickness of the film, which is the packaging base material of the soft pack, is reduced, the film becomes more likely to stretch, and the perforations at the tissue removal section may be unintentionally torn and the soft pack may be opened. In particular, when making a multi-pack of 3 to 8 soft packs, if the soft packs are inserted so that the top surface of the soft pack is perpendicular to the insertion direction of the outer bag, there is a problem that the perforations at the tissue removal section are easily torn unintentionally during insertion.

[0005] Therefore, by increasing the bond rate of the perforations formed in the soft pack and making the perforations stronger, unintentional opening of the perforations when multi-packaging can be improved, but on the other hand, the perforations become more difficult to open when the soft pack is in use, making it difficult to achieve both the compactness of the multi-pack and the ease of opening of the perforations of the multi-pack. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-54498 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above circumstances, and has an object to provide a multi-package in which the number of sets of tissue paper packed in the individual tissue package and the density of the tissue stack are compact within a certain range, and further, even when the multi-package is packed so that the top surface of the individual tissue package is perpendicular to the insertion direction of the outer bag, the perforations will not be unintentionally opened when the individual tissue package is packed in an outer bag, and the perforations are easy to open when the individual tissue package is used. [Means for solving the problem]

[0008] The inventors conducted extensive research and discovered that in a multi-package comprising individual tissue packages, in which a tissue laminate consisting of tissue paper laminated with a film packaging substrate is sealed and the film packaging substrate has a single perforation for forming an opening for removing the tissue paper, and an exterior bag for packaging a plurality of the individual tissue packages, by specifying the number of individual tissue packages, the packaging direction of the individual tissue packages, the density of the tissue laminate, the thickness of the film packaging substrate, the bond rate of the perforation, and the number of sets of tissue laminates, it is possible to produce a multi-package containing a plurality of individual tissue packages, in which the perforation is not unintentionally opened when the individual tissue packages are packaged in the exterior bag, and the perforation is easy to open when the individual tissue packages are used, thereby solving the above-mentioned problems, and thus completing the present invention.

[0009] (1) A first aspect of the present invention is a multi-packaging product comprising an individual tissue package, in which a tissue laminate formed by laminating tissue paper with a film packaging base is sealed, the film packaging base having a single line perforation for forming an opening for removing the tissue paper, and an exterior bag for packaging a plurality of the individual tissue packages, the plurality of individual tissue packages being 3 to 8, packaged so that the top-bottom direction of the exterior bag and the long side direction of the individual tissue packages are approximately parallel, and the density of the tissue laminate is 0.18 g / cm. 3 More than 0.26g / cm 3 the thickness of the film packaging base is 22 μm or more and 72 μm or less, the bond rate of the perforations is 10% or more and 70% or less, and the tissue laminate is a laminate of 180 sets or more and 240 sets or less of 2-ply tissue.

[0010] (2) A second aspect of the present invention is the multi-packaging body described in (1), characterized in that (perimeter of the individual tissue packages / perimeter of the tissue laminate) x 100(%) is 100% or more and 111% or less.

[0011] (3) A third aspect of the present invention is the multi-packaging body according to (1), characterized in that the height of the tissue stack is 35 mm or more and 50 mm or less.

[0012] (4) A fourth aspect of the present invention is the multi-packaging body described in (1), characterized in that the tensile strength of the perforation portion including the perforation in the film packaging base material is 4 N / 50 mm or more and 26 N / 50 mm or less.

[0013] (5) A fifth aspect of the present invention is the multi-package according to (1), characterized in that the individual tissue packages are packaged in a gusseted form.

[0014] (6) A sixth aspect of the present invention is the multi-package described in (1), characterized in that the individually wrapped tissues are packaged in a pillow package.

[0015] (7) A seventh aspect of the present invention is the multi-packaging body according to (1), characterized in that the tensile strength of the packaging base material in the MD direction is 7N or more and 22N or less. Effect of the Invention

[0016] According to the present invention, it is possible to provide a multi-package in which the number of sets of tissue paper packed in the individual tissue package and the density of the tissue stack are compact within a certain range, and further, even when the multi-package is packed so that the top surface of the individual tissue package is perpendicular to the insertion direction of the outer bag, the perforations will not be unintentionally opened when the individual tissue package is packed in the outer bag, and the perforations are easy to open when the individual tissue package is used. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing an example of a multi-packaging body of the present invention. [Diagram 2]FIG. 2 is a perspective view showing an example of a process for packaging individual tissue packages in an outer bag in the multi-packaging body of the present invention. [Diagram 3] FIG. 1 is a perspective view showing an example of an individual tissue package and a tissue laminate according to the present invention. [Figure 4] FIG. 2 is a perspective view showing the process of opening the perforation of the individual tissue package of the present invention and removing the tissue paper from the formed removal opening. [Diagram 5] FIG. 2 is a perspective view showing an example of a tissue stack packaged in the individual tissue package of the present invention. [Figure 6] FIG. 2 is a perspective view showing an example of gusset packaging in the individual tissue packages of the present invention. [Figure 7] FIG. 2 is a perspective view showing an example of pillow packaging in the individual tissue packages of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the form for carrying out the present invention (hereinafter, the embodiment) will be described in detail with reference to the drawings. However, these are presented for the purpose of illustration only and are not intended to limit the present invention.

[0019] In this specification, the term "individually wrapped tissue" refers to an individually wrapped pack containing a laminate of tissues, etc., and the term "multi-package" refers to a so-called multi-pack in which a plurality of "packages" are wrapped in an outer bag. The terms "MD direction" and "CD direction" refer to the direction of the production line (conveying direction) and the direction perpendicular to the direction of the production line, respectively, during the manufacture of the package. "Compactness" refers to the compactness of the individually wrapped tissue. For example, when the density of the laminate is less than the lower limit, the compactness of the individually wrapped tissue is poor. On the other hand, when the number of sets of tissue paper exceeds the upper limit, the individually wrapped tissue will swell, meaning that the compactness of not only the individually wrapped tissue but also the multi-package will be poor. In addition, when the number of sets is reduced, the tissue laminate becomes compact, but when the number of sets is reduced, the frequency of replacing the individually wrapped tissue increases, so the compactness is also poor when the number of sets is reduced.

[0020] <Multi-packaging> 1 is a perspective view showing an example of the multi-package of the present invention. The multi-package 5 has a plurality of individual tissue packages 1 stored in parallel inside an outer bag 50.

[0021] (Number of pieces) The number of individual tissue packages 1 packaged in the multi-package 5 is 3 or more and 8 or less. If the number of packages is less than 3, the total number of tissue sets in the individual tissue package 1 will be fewer, resulting in a less appropriate compactness. Also, the proportion of exterior bags 50 used will increase, resulting in higher costs. If the number of packages exceeds 8, the multi-package 5 will be less compact.

[0022] (Orientation of individual tissue packaging) Fig. 2 is a perspective view showing an example of a process for packaging the individual tissue packages 1 in the multi-package 5 of the present invention in an exterior bag 50. As shown in Fig. 2, the individual tissue packages 1 to be packaged in the multi-package 5 are packaged vertically so that the up-down direction of the exterior bag 50 and the long side direction of the individual tissue packages 1 are approximately parallel. If the individual tissue packages 1 are not packaged in this direction, they may bend when both ends of the individual tissue packages 1 are pinched by guides when they are inserted into the exterior bag 50, causing the perforations to be unintentionally opened.

[0023] (Outer bag) The exterior bag 50 is a resin film that packages multiple individual tissue packages 1. The exterior bag 50 covers the multiple individual tissue packages 1 stacked side by side from all directions (both sides in the X direction, both sides in the Y direction, and both sides in the Z direction).

[0024] Examples of the resin film used for the outer bag 50 include LDPE (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), milky PE (polyethylene), CPP (non-oriented polypropylene), and films obtained by blending or mixing these materials. Also, these films may be laminated, coated, or multi-layered with different materials. Examples of the different materials include OPP (oriented polypropylene), EVOH (ethylene vinyl alcohol copolymer), Ny (nylon), PET (polyethylene terephthalate), and PVDC (polyvinylidene chloride). Among these, LDPE (low density polyethylene), LLDPE (linear low density polyethylene), and HDPE (high density polyethylene) are preferred.

[0025] <Individually wrapped tissues> FIG. 3 is a perspective view showing an example of an individual tissue package 1 (hereinafter, also simply referred to as a "package") and a tissue laminate 11 in the multi-package of the present invention. The individual tissue package 1 is a tissue laminate 11 (hereinafter, also simply referred to as a "laminate") in which tissue paper 21 (hereinafter, also referred to as "thin paper") is laminated with a packaging base material 10 including at least a film base material, and the tissue laminate 11 is sealed by a seal part 12. The seal part 12 is preferably provided at the end where the packaging base material 10 overlaps. In this case, as shown in FIG. 3, the seal part 12 is preferably formed in a substantially straight line at a position about 10 mm from both ends of the package 1, and each seal part 12 is preferably formed so that it is substantially parallel, but it may be formed at a position other than this as long as the sealability of the package 1 (adhesiveness of the seal part 12) can be ensured. The pattern of the seal part is not particularly limited and may be a dotted line, a lattice, a plurality of straight lines, etc.

[0026] The individual tissue package 1 has an opening 14 for taking out the paper tissue 21. The opening 14 is formed by cutting the perforation 13 in the packaging base material 10, which has a single line perforation 13 for forming the opening 14 for the paper tissue 21, and opening the packaging base material 10 when in use. As shown in Fig. 4, the required number of paper tissues 21 can be obtained by sequentially pulling out (removing) the paper tissues 21 from the opening 14 that has been formed.

[0027] The perforations 13 are preferably provided on the surface of the packaging base material 10 that covers the upper part of the laminate 11 so as to be approximately parallel to one side of the tissue paper 21. In addition, the perforations 13 are preferably provided so as to be positioned above the center of the tissue laminate 11.

[0028] <Packaging base material> The packaging substrate 10 contains at least a film substrate. It is preferable that the packaging substrate 10 does not contain paper, and that the packaging substrate 10 has printing. The basis weight value described below is a value including printing ink. It is preferable that the packaging substrate 10 contains 90% by weight or more of the film substrate, and more preferable that the packaging substrate 10 contains 95% by weight or more of the film substrate.

[0029] When the individual tissue package 1 is a gusset package, the packaging substrate 10 is preferably tubular (i.e., when the packaging substrate 10 includes only a film substrate, it is a tubular film). A tubular film is a film obtained by forming a sheet-like film into a cylindrical shape like a tube. On the other hand, when the individual tissue package 1 is a pillow package, the packaging substrate 10 is formed into a cylindrical shape while wrapping and sealing the tissue laminate 11, so that the packaging substrate 10 is preferably a raw roll film (flat raw film) type.

[0030] (Film substrate) The film constituting the film substrate may be formed as a single layer or multiple layers, but a single layer is preferred. The film material can be any plastic (thermoplastic resin) film used for packaging ordinary paper products, without any particular limitations. The film may also be surface-treated, such as a matte film. Examples of the plastic film material include conventionally known thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.), polyester (PET, etc.), polyamide (nylon, etc.), polycarbonate, polystyrene, polyvinyl chloride, etc., and polyethylene is preferred.

[0031] As a specific configuration, when the film substrate is formed of a single layer, the material of the film is preferably LDPE (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), milky PE (polyethylene), CPP (non-oriented polypropylene), or a film in which these materials are blended or mixed. In addition, these films may be laminated, coated, or multi-layered with different materials to form a multi-layer film. Examples of the different materials include OPP (oriented polypropylene), EVOH (ethylene vinyl alcohol copolymer), Ny (nylon), PET (polyethylene terephthalate), and PVDC (polyvinylidene chloride). Among these, LDPE (low density polyethylene), LLDPE (linear low density polyethylene), and HDPE (high density polyethylene) are preferred. By using PE, the tissue individual package 1 can be held firmly without slipping, making it easier to open the perforation 13.

[0032] The method for matt-finishing the film substrate is not particularly limited, and may be a conventionally known method, such as a method of pressing the surface of the film substrate against an embossing roll or a matte roll during molding to impart irregularities, a method of imparting irregularities by sandblasting, etc. Alternatively, for example, a method of using a polymer blend or a method of biaxially stretching a laminate of a polyolefin resin blend may be employed without carrying out surface treatment as described above.

[0033] The packaging substrate 10 of the present invention may also have other layers in addition to the film substrate. Examples of the other layers include a water vapor barrier layer, an oxygen barrier layer, a print layer, a printability improving layer, an overprint layer, and a light-shielding layer. These other layers can be provided, for example, on the surface in contact with the tissue paper 21 or on the surface exposed to the outside air, and may be one layer or two or more layers.

[0034] (Thickness of packaging material) The thickness of the packaging substrate 10 is 22 μm or more and 72 μm or less. If the thickness is less than 22 μm, the perforation 13 is likely to be torn unintentionally when the individual tissue package 1 is packaged in the outer bag 50. If the thickness exceeds 72 μm, the perforation 13 is difficult to tear and the individual tissue package 1 is difficult to open when in use. The lower limit of the thickness of the packaging substrate 10 is preferably 28 μm or more, more preferably 33 μm or more. The upper limit is preferably 62 μm or less, more preferably 52 μm or less. The thickness of the packaging substrate 10 can be measured in accordance with JIS K7130.

[0035] (Tensile strength of packaging substrate (MD)(CD)) The tensile strength (MD) in the MD direction of the packaging substrate 10 is preferably 7N or more and 22N or less. If the tensile strength (MD) is less than 7N, the perforation 13 is likely to tear unintentionally when the individual tissue package 1 is packaged in the outer bag 50. If the tensile strength (MD) exceeds 22N, the perforation 13 is difficult to tear and the individual tissue package 1 is difficult to open when in use. The lower limit of the tensile strength (MD) is more preferably 9N or more, and even more preferably 11N or more. The upper limit is more preferably 19N or less, and even more preferably 17N or less.

[0036] On the other hand, the lower limit of the tensile strength (CD) in the CD direction of the packaging substrate 10 is preferably 6N or more, more preferably 8N or more, and even more preferably 10N or more. The upper limit is preferably 21N or less, more preferably 18N or less, and even more preferably 16N or less. If the tensile strength (CD) is less than 6N, the perforation 13 is likely to be torn unintentionally when the individual tissue package 1 is packaged in the outer bag 50. If the tensile strength (CD) exceeds 21N, the perforation 13 is difficult to be torn during use of the individual tissue package 1, making it difficult to open. The tensile strengths in the MD and CD directions of the packaging substrate 10 are measured in accordance with JIS K 7127, and the width of the test piece is 10 mm.

[0037] (Perimeter of packaging material (A)) The lower limit of the circumference (hereinafter also referred to as "A") of the packaging base material 10 is preferably 260 mm or more, more preferably 270 mm or more, and even more preferably 278 mm or more. The upper limit is preferably 325 mm or less, more preferably 305 mm or less, and even more preferably 290 mm or less. If the circumference (A) is less than 260 m, the individual tissue package 1 will swell, and the perforation 13 will be easily torn unintentionally when packaging the individual tissue package 1 in the outer bag 50. Also, if the circumference (A) exceeds 325 m, the individual tissue package 1 and the multi-package 5 will not be tight enough and will not be compact enough.

[0038] The perimeter (A) of the packaging substrate 10 can be measured with a ruler after cutting the packaging substrate 10 of the individual tissue package 1 and gently removing the tissue laminate 11. If the individual tissue package 1 is a pillow package, the length of the overlapping film of the heat-sealed portion is not included. Here, the perimeter of the packaging substrate 10 is the direction along the CD direction of the packaging substrate 10, which corresponds to the perimeter of the short side direction of the tissue laminate 11.

[0039] (Length of perforation joint) The lower limit of the length of the joint of the perforation 13 formed in the packaging base material 10 is preferably 0.4 mm or more, more preferably 0.5 mm or more, and even more preferably 0.8 mm or more. The upper limit is preferably 4.0 mm or less, more preferably 2.5 mm or less, and even more preferably 1.5 mm or more. If the length of the joint is less than 0.4 mm, the perforation 13 is likely to be torn unintentionally when the individual tissue package 1 is packaged in the outer bag 50. If the length of the joint exceeds 4.0 mm, the perforation 13 is difficult to tear and open when the individual tissue package 1 is used. The length of the joint of the perforation 13 is measured using a microscope.

[0040] (Length of perforation line) The lower limit of the length of the cut line of the perforation 13 formed in the packaging base material 10 is preferably 0.5 mm or more, more preferably 0.7 mm or more, and even more preferably 1.0 mm or more. The upper limit is preferably 4.5 mm or less, more preferably 3.5 mm or less, and even more preferably 2.5 mm or more. If the length of the cut line is less than 0.5 mm, the perforation 13 is difficult to tear when the individual tissue package 1 is used, making it difficult to open. If the length of the joint exceeds 4.5 mm, the perforation 13 is easily torn unintentionally when the individual tissue package 1 is packaged in the outer bag 50. The length of the cut line of the perforation 13 is measured using a microscope.

[0041] (Perforation bond rate) The bond rate of the perforation 13 (the rate of the joint of the perforation 13) is 10% or more and 70% or less. If the bond rate is less than 10%, the perforation 13 is likely to tear unintentionally when the individual tissue package 1 is packaged in the outer bag 50. If the bond rate exceeds 70%, the perforation 13 is difficult to tear and open when the individual tissue package 1 is in use. The lower limit of the bond rate of the perforation 13 is preferably 20% or more, and more preferably 30% or more. The upper limit is preferably 55% or less, and even more preferably 45% or less. The bond rate of the perforation 13 (the rate of the joint of the perforation 13) is determined as follows. Bond rate of perforation 13 (%) = length of joint of perforation 13 / (length of joint of perforation 13 + length of cut line of perforation 13) x 100

[0042] (Tensile strength of perforated section) The tensile strength of the packaging substrate 10 at the perforation 13 is preferably 4N / 50mm or more and 26N / 50mm or less. If the tensile strength of the perforation 13 is less than 4N / 50mm, the perforation 13 is likely to be torn unintentionally when packaging the individual tissue package 1 in the outer bag 50. If the tensile strength of the perforation 13 exceeds 26N / 50mm, the perforation 13 is difficult to tear and open when the individual tissue package 1 is used. The lower limit of the tensile strength of the packaging substrate 10 at the perforation 13 is more preferably 7N / 50mm or more, more preferably 10N / 50mm or more. The upper limit is more preferably 20N / 50mm or less, and even more preferably 17N / 50mm or less. The tensile strength of the packaging substrate 10 at the perforation 13 is measured in accordance with JIS P 8113, and the pulling speed is 300mm / min.

[0043] <Tissue paper> 5 is a perspective view showing an example of a tissue stack 11 packaged in the individual tissue package 1 of the present invention. The tissue paper 21 and the tissue stack 11 will be described in detail below.

[0044] The tissue paper 21 included in the tissue laminate 11 is soft tissue made of thin paper. The tissue paper 21 may be one ply or two ply, but two ply is preferable. The tissue paper 21 is preferably general tissue paper rather than lotion tissue paper containing lotion liquid. Lotion tissue paper is designed to increase the compactness of the individual tissue package 1, and is therefore more likely to tear when the perforation 13 is opened.

[0045] (Tissue paper basis weight) The basis weight per ply of tissue paper 21 is 10 g / m 2 On the other hand, the upper limit of the basis weight is 13 g / m 2 Less than 12 g / m is preferred. 2 Less than 11 g / m is more preferable. 2 More preferably, the basis weight is 10 g / m 2If the basis weight is less than 13 g / m, the density of the tissue laminate 11 will be low, and the tightness of the individual tissue packages 1 and the multi-package package 5 will be insufficient, resulting in poor compactness. 2 If it exceeds this value, the density of the tissue laminate 11 will be high, and the perforations 13 will be easily torn unintentionally when the individual tissue packages 1 are packaged in the outer bag 50. The basis weight per ply of the tissue paper 21 is measured in accordance with JIS P 8124.

[0046] (Tissue paper thickness) The lower limit of the thickness of the tissue paper 21 is preferably 0.43 mm / 10 sheets or more, more preferably 0.45 mm / 10 sheets or more. The upper limit of the thickness is preferably 0.62 mm / 10 sheets or less, more preferably 0.57 mm / 10 sheets or less, and even more preferably 0.52 mm / 10 sheets or less. If the thickness is less than 0.43 mm / 10 sheets, the density of the tissue laminate 11 will be low, and the individually wrapped tissue 1 and the multi-wrap 5 will be insufficiently tight and less compact. If the thickness exceeds 0.62 mm / 10 sheets, the density of the tissue laminate 11 will be high, and the perforations 13 will be easily torn unintentionally when the individually wrapped tissue 1 is wrapped in the outer bag 50.

[0047] The thickness of the tissue paper 21 (10 sheets) is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a gauge diameter of 30 mm. A sample is placed between the gauge and the measurement table, and the gauge is read when the gauge is lowered at a speed of 1 mm or less per second. If the tissue paper 21 is two-ply, five sets of two-ply tissue paper 21 are stacked and measured as 10 sheets, and the thickness of the 10 sheets is calculated. The measurement is also repeated 10 times (measurements are made at 10 different places, not the same place 10 times), and the average of the measurement results is taken as the final paper thickness.

[0048] (specific volume of tissue paper) The lower limit of the specific volume of tissue paper 21 is 2.0 cm 3 / g or more is preferable, and 3.0 cm 3 / g or more is more preferable, and 4.0 cm 3 The upper limit of the specific volume is 7.0 cm 3 / g or less is preferable, and 6.0 cm 3 / g or less is more preferable, and 5.0 cm 3 / g or less is more preferable. 3 If the specific volume is less than 7.0 cm3 / g, the individual tissue package 1 and the multi-package 5 will not be tight enough and will be inferior in compactness. 3 If the density exceeds 1 / g, the perforations 13 are likely to be torn unintentionally when the individual tissue packages 1 are packaged in the outer bag 50. The specific volume of the tissue paper 21 is calculated by dividing the paper thickness of the tissue paper 21 by the basis weight, and is expressed as the volume cm per unit g. 3 It is expressed as:

[0049] (Strength of tissue paper in pulling direction) The lower limit of the tensile strength of the paper tissue 21 in the direction of pulling out from the outlet 14 is preferably 1.4 N / 25 mm or more. On the other hand, the upper limit is preferably 1.8 N / 25 mm or less, more preferably 1.7 N / 25 mm or less, and even more preferably 1.6 N / 25 mm or less. If the tensile strength is less than 1.4 N / 25 mm, the basis weight of the paper tissue 21 is low, resulting in a low density of the laminated tissue 11, and the tightness of the individual tissue package 1 and the multi-package 5 is insufficient, resulting in poor compactness. If the tensile strength exceeds 1.8 N / 25 mm, the basis weight of the paper tissue 21 is high, resulting in a high density of the laminated tissue 11, and the perforation 13 is likely to be unintentionally torn when the individual tissue package 1 is packaged in the outer bag 50. The tensile strength is measured in accordance with JIS P 8113, and the pulling speed is 300 mm / min.

[0050] (Strength in the direction perpendicular to the tissue paper pull-out direction) The lower limit of the tensile strength of the paper tissue 21 in the direction perpendicular to the direction of pulling out from the take-out opening 14 is preferably 4.0 N / 25 mm or more, while the upper limit is preferably 6.0 N / 25 mm or less, more preferably 5.5 N / 25 mm or less, and even more preferably 5.0 N / 25 mm or less. If the tensile strength is less than 4.0 N / 25 mm, the basis weight of the paper tissue 21 is low, resulting in a low density of the laminated tissue 11, and the tightness of the individual tissue package 1 and the multi-package 5 is insufficient, resulting in poor compactness. If the tensile strength exceeds 6.0 N / 25 mm, the basis weight of the paper tissue 21 is high, resulting in a high density of the laminated tissue 11, and the perforations 13 are likely to be unintentionally torn when the individual tissue package 1 is packaged in the outer bag 50. The tensile strength of the tissue paper 21 in the direction of pulling out from the outlet 14 and in the direction perpendicular to the pulling out direction are measured in accordance with JIS P 8113, and the pulling speed is 300 mm / min.

[0051] <Tissue laminate> Although there is no particular limitation on the folding method of the paper tissue 21 included in the tissue laminate 11, it is preferable that the paper tissue 21 is folded in a V shape and laminated. By folding in a V shape, the individually wrapped tissue 1 can be obtained in such a way that the upper and lower parts of the laminate 11 are less likely to turn over during packaging. The processing machine used for folding in a V shape may be either an interfolder or a multi-stand type interfolder, but a multi-stand type interfolder is preferable. In the case of an interfolder, the direction in which the paper tissue 21 is pulled out from the outlet 14 is the MD direction, and in the case of a multi-stand type interfolder, the direction in which the paper tissue 21 is pulled out from the outlet 14 is the CD direction. The strength of the tissue paper in the pulling direction and the strength in the direction perpendicular to the pulling direction of the tissue paper described above are based on the assumption of a multi-stand type interfolder (strength in the pulling direction < strength in the direction perpendicular to the pulling direction). In the case of an interfolder, the strength in the direction in which the tissue paper is pulled out and the strength in the direction perpendicular to the direction in which the tissue paper is pulled out can be regarded as being interchanged (strength in the direction in which the tissue paper is pulled out > strength in the direction perpendicular to the direction in which the tissue paper is pulled out).

[0052] (Number of tissue papers) The number of sets of the paper tissue 21 contained in the laminated tissue 11 is 180 or more and 240 or less sets of 2-ply tissue paper 21. If the number of sets is less than 180 sets, the tightness of the individual tissue package 1 and the multi-package 5 will be insufficient and the compactness will be inferior. If the number of sets exceeds 240 sets, the density of the laminated tissue 11 will be high and the perforations 13 will be easily cut unintentionally when packaging the individual tissue package 1 in the outer bag 50. The lower limit of the number of sets of the paper tissue 21 is preferably 190 or more, and more preferably 200 or more. The upper limit is preferably 220 or less, and more preferably 210 or less.

[0053] (Stack height) The height of the tissue laminate 11 is preferably 35 mm or more and 50 mm or less. If the height is less than 35 mm, the individual tissue packages 1 and the multi-package 5 will not be tight enough and will be less compact. If the height exceeds 50 mm, the individual tissue packages 1 and the multi-package 5 will bulge and will be less compact. The lower limit of the height of the tissue laminate 11 is more preferably 37 mm or more, and even more preferably 39 mm or more. The upper limit is more preferably 45 mm or less, and even more preferably 43 mm or less.

[0054] The height of the tissue laminate 11 can be measured as follows. After cutting the packaging substrate 10 of the individual tissue package 1 and gently removing the tissue laminate 11, a 30 cm ruler (Silver straight scale JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Sokutei Co., Ltd.) is placed at the center of the short side direction of the laminate 11 along the long side direction of the laminate 11, and the heights of both ends of the laminate 11 are measured. Similarly, a 30 cm ruler is placed at the center of the long side direction of the laminate 11 along the short side direction of the laminate 11, and the heights of both ends of the laminate 11 are measured. These four values ​​are averaged to determine the final height of the tissue laminate 11.

[0055] (Length of the long side of the laminate) The lower limit of the length of the long side of the tissue laminate 11 is preferably 140 mm or more, more preferably 150 mm or more, and even more preferably 160 mm or more. The upper limit is preferably 220 mm or less, more preferably 200 mm or less, and even more preferably 180 mm or less. If the length of the long side is less than 140 mm, the individual tissue packages 1 and multi-package 5 will not be tight enough and will be less compact. If the length of the long side exceeds 220 mm, the individual tissue packages 1 and multi-package 5 will bulge and will be less compact.

[0056] The length of the long side of the tissue laminate 11 can be measured as follows: Cut the packaging substrate 10 of the individual tissue package 1, and gently remove the tissue laminate 11. Place a 30 cm ruler (Shinwa Sokutei Co., Ltd., silver straight scale, JIS Class 1, stainless steel, 64 g) at the center of the short side of the laminate 11 along the long side of the laminate 11, and measure the length of the top surface, which is the length in the long side direction.

[0057] (Length of the short side of the laminate) The lower limit of the short side length of the tissue laminate 11 is preferably 80 mm or more, more preferably 85 mm or more, and even more preferably 90 mm or more. The upper limit is preferably 125 mm or less, more preferably 115 mm or less, and even more preferably 105 mm or less. If the short side length is less than 80 mm, the individual tissue packages 1 and multi-package 5 will not be tight enough and will be less compact. If the short side length exceeds 125 mm, the individual tissue packages 1 and multi-package 5 will bulge and will be less compact.

[0058] The length of the short side of the tissue laminate 11 can be measured as follows: Cut the packaging base material 10 of the individual tissue package 1, and gently remove the tissue laminate 11. Place a 30 cm ruler (Silver straight scale JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Sokutei Co., Ltd.) at the center of the long side of the tissue laminate 11 along the short side of the tissue laminate 11, and measure the length of the top surface, which is the length in the short side direction.

[0059] (Perimeter of the short side of the laminate (B)) The lower limit of the perimeter of the short side of the tissue laminate 11 (hereinafter also referred to as "B") is preferably 260 mm or more, more preferably 265 mm or more, and even more preferably 270 mm or more. The upper limit is preferably 290 mm or less, more preferably 285 mm or less, and even more preferably 280 mm or less. If the perimeter of the short side is less than 260 mm, the individual tissue packages 1 and multi-package 5 will not be tight enough and will be less compact. If the perimeter of the short side exceeds 290 mm, the individual tissue packages 1 and multi-package 5 will bulge and will be less compact.

[0060] The perimeter (B) of the short side direction of the tissue laminate 11 can be measured as follows. The packaging substrate 10 of the individual tissue package 1 is cut, and the tissue laminate 11 is gently removed. A 30 cm ruler (Silver straight ruler JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Sokutei Co., Ltd.) is placed in the center of the long side direction of the tissue laminate 11 along the short side direction of the tissue laminate 11, and the perimeter is determined from the length of the short side direction of the tissue laminate 11 and the height of the tissue laminate 11 as described above, as follows. Perimeter (B) of the laminate 11 in the short side direction = (length of the laminate 11 in the short side direction) x 2 + (height of the laminate) x 2

[0061] (Perimeter ratio) The ratio of the circumference of the packaging substrate 10 to the tissue laminate 11 ((A) / (B)×100(%)) is preferably 100% or more and 111% or less. If the ratio is less than 100%, the perforation 13 is likely to be unintentionally torn when packaging the individual tissue package 1 in the outer bag 50. If the ratio exceeds 111%, the individual tissue package 1 and the multi-package 5 will not be tight enough and will be less compact. The lower limit of the circumference ratio is more preferably 101% or more, and even more preferably 103% or more. The upper limit is more preferably 109% or less, and even more preferably 106% or less.

[0062] (mass of laminate) The lower limit of the mass of the tissue laminate 11 is preferably 125 g or more, more preferably 130 g or more, and even more preferably 138 g or more. The upper limit is preferably 175 g or less, more preferably 160 g or less, and even more preferably 150 g or less. If the mass of the tissue laminate 11 is less than 125 g, the tightness of the individual tissue package 1 and the multi-package 5 is insufficient, resulting in poor compactness. If the mass of the tissue laminate 11 exceeds 175 g, the perforation 13 is likely to be unintentionally torn when the individual tissue package 1 is packaged in the outer bag 50, and the individual tissue package 1 and the multi-package 5 are bulged, resulting in poor compactness. The mass of the tissue laminate 11 is measured by removing the tissue laminate 11, which has a long side of 172 mm and a short side of 96 mm, from the individual tissue package 1, and measuring it on an electronic balance after conditioning the humidity at 23°C and 50%. The sizes of the long and short sides can be adjusted as appropriate.

[0063] (Density of tissue paper laminate) The density of the tissue laminate 11 is 0.18 g / cm 3 More than 0.26g / cm 3 The density is 0.18g / cm 3 If the density is less than 0.26 g / cm, the individual tissue package 1 and the multi-package 5 will not be tight enough and will be inferior in compactness. 3 If the density exceeds 0.20 g / cm, the perforations 13 are likely to be torn unintentionally when the individual tissue packages 1 are packaged in the outer bag 50, and the individual tissue packages 1 and the multi-package 5 are bulged, resulting in poor compactness. 3 More than 0.21 g / cm is preferable. 3 More preferably, the upper limit is 0.24 g / cm 3 Less than 0.23 g / cm is preferred. 3 The following is more preferred:

[0064] The density of the tissue laminate 11 is measured as follows. First, the tissue laminate 11 is removed from the individual tissue package 1, and the mass of the tissue laminate 11 is measured with an electronic balance after conditioning the humidity at 23°C and 50%. Then, the height, length in the long side direction, and length in the short side direction of the above-mentioned tissue laminate 11 are measured with a ruler, and the density is calculated according to the following formula. Density of tissue laminate 11 (g / cm 3 )=mass of laminate 11 (g) / (height of laminate (cm)×length of laminate 11 in the long side direction (cm)×length of laminate 11 in the short side direction (cm))

[0065] (Packaging format) The packaging format of the individually wrapped tissue 1 is preferably gusset packaging or pillow packaging.

[0066] (gusset packaging) As shown in Fig. 6, gusset packaging is a packaging format in which the packaged item (laminate 11) is inserted into the inside of a packaging base material 10, which is formed into a cylindrical shape with both ends of the bottom or mouth folded inward to match the length (height) of the bag and sealed at one end with a seal part 12, through an insertion opening 15, and then sealed horizontally by heat sealing or the like, and cut into individual bags at the sealed part. This gusset packaging can be performed using a known device. Alternatively, the laminate 11 may be inserted in a state in which the packaging base material 10 at the insertion opening 15 is turned outward so as not to be rolled inward.

[0067] (Pillow packaging) Pillow packaging is a packaging format in which, as shown in Fig. 7, the packaging substrate 10 is overlapped at both widthwise ends with the inner faces facing each other so as to wrap the packaged item placed on or under the sheet-like packaging substrate 10 into a cylindrical shape, and this overlapped portion (16 in Fig. 7) is formed into a cylindrical shape by heat sealing or the like, and the bottom or mouth portion (12 in Fig. 7) is sealed in a horizontal line by heat sealing or the like to match the length (height) of the bag, and the sealed portion is cut into individual bags. This pillow packaging can be performed using known equipment.

[0068] There are two types of pillow packaging: vertical pillow packaging, in which the packaging base is fed vertically and the packaged item is filled from above while being wrapped, and horizontal pillow packaging, in which the packaging base is fed horizontally and the packaged item is wrapped. When packaging tissue paper, horizontal pillow packaging is preferred from the perspective of packaging speed and the shape of the tissue paper.

[0069] Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. In addition, it is clear from the description of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention. EXAMPLES

[0070] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples shown below.

[0071] <Example> Multi-packages of Examples 1 to 21 and Comparative Examples 1 to 10 were created under the conditions shown in Tables 2 to 4. Specifically, a tissue laminate was formed using two tissue papers as a set, with the long side of the top surface measuring 172 mm and the short side measuring 96 mm, this tissue laminate was wrapped in a packaging base material to create an individual tissue package, and multiple individual tissue packages were wrapped in an outer bag to produce a multi-package.

[0072] (Packaging base material) The packaging substrate was a polyethylene film with a single layer structure, which was used as it was. The film was printed. For example, in the case of Example 3, the packaging substrate was a film with a width of 300 mm and a pitch of 265 mm (MD direction) for pillow packaging. The width and pitch of the packaging substrate were appropriately changed according to the dimensions of the tissue laminates in the examples and comparative examples.

[0073] (Outer bag) The outer bag was made of a single-layered polyethylene film, and five individually wrapped tissues were wrapped vertically so that the top and bottom directions of the outer bag were approximately parallel to the long side direction of the individually wrapped tissues.

[0074] The multi-packages and the individually wrapped tissue packages of Examples 1 to 21 and Comparative Examples 1 to 10 were evaluated in the following four ways.

[0075] (Difficulty in tearing the perforations when packaging the outer bag of the individually wrapped item) In the process of packaging the five individual tissue packages in the outer bag, the perforations formed at the outlet of the individual tissue packages were evaluated for unintentional tearing of the packages, and 200 packages were evaluated according to the following criteria: 4: The percentage of individually wrapped packages in which the perforation was torn even slightly during packaging was less than 1%. 3: The percentage of individually wrapped packages in which the perforation was torn even slightly during packaging was between 1% and 2%. 2: The percentage of individually wrapped packages in which the perforation was torn even slightly during packaging was between 2% and 5%. 1: The percentage of individually wrapped packages in which the perforation was torn even slightly during packaging was 5% or more.

[0076] (Easiness of tearing perforations when opening tissue) Thirty test subjects evaluated the ease with which the perforations of the individual tissue packages produced could be torn when the tissue outlet was opened. The evaluation criteria were as follows: 4: More than 28 testers rated the perforations as easy to tear 3: 25 to 27 people rated the perforations as easy to tear 2: 22 to 24 people rated the perforations as easy to tear 1: Fewer than 21 reviewers rated the perforations as easy to tear

[0077] (Compactness (density of laminate)) The compactness (density of the laminate) of the individually wrapped tissue products thus produced was evaluated according to the following criteria. 4: The density of the laminate is 0.21 g / cm 3 End 3: The density of the laminate is 0.20 g / cm 3 More than 0.21g / cm 3 less than 2: The density of the laminate is 0.18 g / cm 3 More than 0.20g / cm 3 less than 1: The density of the laminate is 0.18 g / cm 3 less than

[0078] (Compactness (size of individual packaging and number of sets)) The individual tissue packages produced were evaluated for compactness (size of individual package and number of sets). The evaluation criteria are shown in Table 1.

[0079] [Table 1]

[0080] [Table 2]

[0081] [Table 3]

[0082] [Table 4]

[0083] As is clear from the results shown in Tables 2 to 4, in all of the packages of Examples 1 to 21, the perforations were difficult to tear when the individual tissue packages were packaged in outer bags, and the perforations were easy to tear when the tissues were opened, and the packages had good compactness (density of the laminate) and good compactness (size of the individual packages and number of sets).In contrast, Comparative Examples 1 to 10 were inferior in some of the evaluation items.

[0084] From the above, according to this embodiment, it was confirmed that the present invention can provide a multi-package in which a plurality of individually wrapped tissue pieces, each having a certain range of number of tissue paper sets and density of the tissue laminate, are packaged perpendicular to an outer bag, in which the perforations are not likely to be accidentally torn when the individually wrapped tissue pieces are packaged in the outer bag, the perforations are easy to open when the individually wrapped tissue pieces are used, and the multi-package has good compactness (density of the laminate) and compactness (size of the individual packages and number of sets). [Explanation of symbols]

[0085] 1. Individually wrapped tissue 10 Packaging base material 11 Tissue laminate 12 Seal part 13 Perforation 14 Extraction port 15 Insertion port 16 Sealing section (center seal section when packaging in pillowcase) 21 Tissue Paper 5 Multi-packaging 50 Outer bag

Claims

1. A multi-packaging product comprising: an individual tissue package; a tissue laminate in which tissue paper is laminated with a film packaging substrate and sealed; the film packaging substrate having a single line of perforation for forming an opening for removing the tissue paper; and an exterior bag for packaging a plurality of the individual tissue packages, The plurality of individual tissue packages are packaged in a pack of 3 or more and 8 or less, with the top-bottom direction of the outer packaging bag and the long side direction of the individual tissue packages being approximately parallel to each other, The density of the tissue stack is 0.18 g / cm ３ 0.26g / cm or more ３ is as follows: The thickness of the film packaging substrate is 22 μm or more and 72 μm or less, The bond rate of the perforation is 10% or more and 70% or less, The tissue stack is characterized in that 180 to 240 sets of two-ply tissues are stacked together in the multi-package.

2. 2. The multi-package according to claim 1, wherein (perimeter of the individual tissue wrapper / perimeter of the tissue stack) x 100 (%) is 100% or more and 111% or less.

3. 2. The multi-package of claim 1, wherein the height of the tissue stack is 35 mm or more and 50 mm or less.

4. The multi-packaging body according to claim 1, characterized in that the tensile strength of the perforation portion including the perforation in the film packaging base material is 4 N / 50 mm or more and 26 N / 50 mm or less.

5. 2. The multi-package according to claim 1, wherein the individual tissue packages are packaged in a gusseted form.

6. The multi-package according to claim 1, wherein the individually wrapped tissues are packaged in a pillowcase.

7. The multi-packaging body according to claim 1, characterized in that the packaging base material has a tensile strength in the MD direction of 7 N or more and 22 N or less.

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