Multi-package

Abstract

To provide a multi-package of soft pack tissue with a low production cost that exhibits excellent operability and compactness during packaging of an external packaging bag and an individual packaging substrate.SOLUTION: According to a multi-package comprising a plurality of packages, and an outer packaging bag for packaging the plurality of packages, the multi-package is characterized in that the packages are packaged by the outer packaging bag in such a manner that a vertical direction of the outer packaging bag and a long-side direction of the packages are made substantially parallel to each other; the packages are 3 or more and 8 or less packages; according to the packages, a tissue laminate obtained by laminating 180 or more and 240 or less sets of two-ply tissue is packaged with a packaging base material of a thermoplastic resin film; the packaging base material comprises a heat seal part for sealing the tissue laminate at 2 portions of a side face part of the package; the heat seal part has a heat seal width of 2 mm or more and 7 mm or less; and the package has a density of 0.18 g / cm3 or more and 0.24 g / cm3 or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a multi-packaging body in which a plurality of soft packs are packaged.

Background Art

[0002] Thin papers such as tissues are usually sold in a form where a plurality of sheets are laminated and packaged. As such a sales package for thin papers, an inexpensive soft pack type is increasing. Further, for example, Patent Document 1 discloses a multi-pack in which five such soft packs are packaged with an outer film.

[0003] For such a multi-pack, being compact and having low production costs are cited as important factors.

[0004] For example, when inserting a plurality of soft packs into an outer film, if the soft packs are stacked in series so that the top surfaces of the soft packs are orthogonal to the insertion direction, the soft packs will bend in an inverted V shape with respect to the insertion direction, making it difficult to sandwich the soft packs with the guides on both sides and resulting in poor operability. On the other hand, when inserting soft packs into an outer film, if the soft packs are stacked in parallel so that the top surfaces of the soft packs are parallel to the insertion direction, the deformation of the soft packs can be suppressed, but if the soft packs are not tight, it becomes difficult to sandwich the soft packs with the guides on both sides and the operability is poor.

[0005] Furthermore, when giving the soft pack tightness, it is difficult to package the soft pack, and if the side heat seal is weak, it is likely to result in a packaging defect. On the contrary, if the heat seal is too strong, the film will break and result in a packaging defect.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] As described above, poor operability results in high production costs. Further, if the number of sets in the soft pack is too large, the compactness is poor, and if the number of sets is too small, the cost per set of tissue increases.

[0008] The present invention has been made in view of such circumstances, and provides a multi-packaging body for a soft pack tissue, which is excellent in the operability during packaging of the outer bag and the individual packaging base material and the compactness of the product, and has a low production cost.

Means for Solving the Problems

[0009] The inventor has conducted intensive studies and found that in a multi-packaging body including a plurality of packaging bodies and an outer bag for packaging the plurality of packaging bodies, by defining the direction of inserting the plurality of packaging bodies into the outer bag, the number of packaging bodies contained in the multi-packaging body, the number of tissue sets in the packaging body, the heat seal width of the packaging body, and the density of the packaging body, a multi-packaging body excellent in operability, compactness, and production cost can be obtained, and the above problems can be solved, thus completing the present invention. That is, the present invention provides the following.

[0010] (1) A first aspect of the present invention is a multi-packaging body including a plurality of packaging bodies and an outer bag for packaging the plurality of packaging bodies, wherein the plurality of packaging bodies are packaged by the outer bag such that the vertical direction of the outer bag and the long side direction of the packaging body are substantially parallel, the plurality of packaging bodies are 3 or more and 8 or less, the packaging body is a tissue laminate in which 180 or more and 240 or less sets of 2-ply tissues are laminated, and the tissue laminate is packaged with a packaging base material of a thermoplastic resin film, the packaging base material includes heat seal portions for sealing the tissue laminate at two locations on the side surface portion of the packaging body, the width of the heat seal in the heat seal portion is 2 mm or more and 7 mm or less, and the density of the packaging body is 0.18 g / cm 3 or more and 0.24 g / cm 3It is a multi-packaging body, characterized by the following.

[0011] (2) The second aspect of the present invention is the multi-packaging body described in (1), wherein the restoration value of the tissue laminate when the tissue laminate is taken out from the packaging body (height of the tissue laminate / height of the packaging body × 100 (%)) is 101% or more and 128% or less.

[0012] (3) The third aspect of the present invention is the multi-packaging body described in (1), wherein the bulk density of the packaging body (number of sets of the tissue laminate / height of the packaging body) is 8.5 sets / mm or more and 11.5 sets / mm or less.

[0013] (4) The fourth aspect of the present invention is the multi-packaging body described in (1), wherein the basis weight per ply of the tissue is 8.0 g / m 2 or more and 12.0 g / m 2 or less.

[0014] (5) The fifth aspect of the present invention is the multi-packaging body described in (1), wherein the tensile strength DMDT in the MD direction during drying of the tissue based on JIS P 8113 is 3.5 N / 25 mm or more and 6.5 N / 25 mm or less, and the tensile strength DCDT in the CD direction during drying based on JIS P 8113 is 1.0 N / 25 mm or more and 2.2 N / 25 mm or less.

[0015] (6) The sixth aspect of the present invention is the multi-packaging body described in (1), wherein the packaging body is provided with a perforation for forming a take-out opening on the top surface, and the bond ratio of the perforation is 30% or more and 70% or less.

[0016] (7) The seventh aspect of the present invention is the multi-packaging body described in (1), wherein the packaging form of the packaging body is tube gusset packaging.

[0017] (8) The eighth aspect of the present invention is the multi-packaging body described in (1), characterized in that the packaging form of the packaging body is pillow packaging.

Advantages of the Invention

[0018] According to the present invention, in the multi-packaging body of soft-pack tissue, it is possible to provide a multi-packaging body that is excellent in the operability during the packaging of the outer packaging bag and the individual packaging base material and the compactness of the product, and has a low production cost.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. However, these are presented for illustrative purposes and do not limit the present invention.

[0021] In this specification, the "package" means an individual packaging pack containing a laminate such as a tissue, and the "multi-package" means a so-called multi-pack in which a plurality of "packages" are packaged in an outer bag. Also, the "MD direction" and the "CD direction" respectively mean the manufacturing line direction (conveying direction) and the direction orthogonal to the manufacturing line direction during the manufacture of the package.

[0022] <Multi-package> Figure 1 is a perspective view showing an example of the multi-package 5 of the present invention. In the multi-package 5, a plurality of packages 1 are stored in parallel inside an outer bag 50.

[0023] (Number of packages) The number of 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 usage ratio of the outer bag 50 increases and the cost rises. If the number of packages exceeds 8, the multi-package 5 is inferior in compactness. The upper limit value of the number of packages is preferably 7 or less, and more preferably 6 or less.

[0024] (Orientation of the package) Figure 2 is a perspective view showing an example of the process of packaging the package 1 in the multi-package 5 of the present invention. As shown in Figure 2, the package 1 packaged in the multi-package 5 is vertically packaged so that the vertical direction of the outer bag 50 and the long side direction of the package 1 are substantially parallel. If it is not packaged in this direction, when inserting the package 1 into the outer bag 50, the package 1 may bend when sandwiching both ends of the package 1 with a guide, deteriorating the operability.

[0025] (Outer bag) The outer bag 50 is a resin film for packaging a plurality of packages 1. The outer bag 50 covers a plurality of packages 1 stacked left and right from all directions (both sides in the X direction, both sides in the Y direction, both sides in the Z direction).

[0026] Examples of the resin film used for the outer packaging bag 50 include LDPE (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), CPP (cast polypropylene), or films obtained by blending and mixing these materials. Further, films obtained by laminating, coating, or multi-layer forming these films with different materials may also be used. Examples of the different materials include OPP (oriented polypropylene), EVOH (ethylene vinyl alcohol copolymer), Ny (nylon), PET (polyethylene terephthalate), PVDC (polyvinylidene chloride), etc. Among these, LDPE (low density polyethylene), LLDPE (linear low density polyethylene), and HDPE (high density polyethylene) are preferred.

[0027] <Package> Figure 3 is a perspective view showing an example of the package 1 and the tissue laminate 11 in the multi-package 5 of the present invention. The package 1 of the present invention is covered with a tissue laminate 11 (hereinafter also simply referred to as "laminate") in which tissue paper 21 is laminated on a packaging base material 10, and the tissue laminate 11 is sealed by a heat seal portion 12.

[0028] (Packaging base material) The packaging base material 10 is a thermoplastic resin film base material, and in the case of tube gusset packaging, it is preferably a tube-shaped film. Further, in the case of pillow packaging, since the tissue laminate 11 is wrapped and sealed while forming the packaging base material 10 into a cylindrical shape, the packaging base material 10 is preferably of the original roll film (flat original roll) type. If it is not a thermoplastic resin film base material, for example, in the case of paper, the tightness of the packaging is inferior. Further, the packaging base material 10 preferably has printing. Note that the tube-shaped film is a film formed by forming a sheet-like film into a cylindrical shape like a tube.

[0029] The film constituting the packaging base material 10 may be formed as a single layer or a multilayer, but from the viewpoint of cost, it is preferably formed as a single layer. The material of the film can be used without particular limitation as a plastic (thermoplastic resin) film used when packaging ordinary paper products, and surface treatment such as embossing may also be performed. As the material of the plastic film, polyolefin (such as polyethylene and polypropylene), polyester (such as PET), polyamide (such as nylon), polycarbonate, polystyrene, polyvinyl chloride, etc., conventionally known thermoplastic resins can be mentioned, and polyethylene is preferable.

[0030] As a specific configuration, when the film base material is formed as a single layer, the material of the film is preferably LDPE (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), CPP (cast polypropylene), or a film obtained by blending and mixing these materials. Further, it may be a multilayer film in which a different material is laminated, coated, or made into a multilayer with these films. Examples of the different materials include OPP (oriented polypropylene), EVOH (ethylene vinyl alcohol copolymer), Ny (nylon), PET (polyethylene terephthalate), PVDC (polyvinylidene chloride), etc. Among these, LDPE (low density polyethylene), LLDPE (linear low density polyethylene), and HDPE (high density polyethylene) are preferable. By using PE, the individual package 1 can be firmly held without slipping, making it easier to open the perforation.

[0031] The packaging base material 10 of the present invention may include other layers in addition to the film base material. Examples of the other layers include a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printing suitability improvement layer, an overprint layer, a light shielding layer, etc. These other layers can be provided, for example, on the surface in contact with the tissue laminate 11 or on the surface in contact with the outside air. It should be noted that the layers described above are not related to the number of layers of the film.

[0032] (Perforation of the package) The package 1 preferably includes a dispensing opening 14 for taking out the tissue paper 21. This dispensing opening 14 is formed by the packaging base material 10 having a single-line stitch 13 for forming the dispensing opening 14 of the tissue paper 21, and is formed by cutting and opening the stitch 13 during use. As shown in FIG. 4, by sequentially pulling out (taking out) the tissue paper 21 from the formed dispensing opening 14, the required number of sheets of the tissue paper 21 can be obtained.

[0033] The stitch 13 is provided on the surface of the packaging base material 10 that covers the upper part of the tissue laminate 11 so as to be substantially parallel to one side of the tissue paper 21. Further, it is preferably provided so as to be disposed above the central portion of the tissue laminate 11. In addition, it is preferable that the length direction of the single-line stitch 13 is parallel to the MD direction of the packaging base material 10.

[0034] (Bond ratio of the stitch) The bond ratio of the stitch 13 (the ratio of the connecting portion of the stitch 13) is preferably 30% or more and 70% or less. If the bond ratio is less than 30%, the stitch 13 may be inadvertently opened during production, resulting in packaging defects and poor operability. If the bond ratio exceeds 70%, the stitch 13 is difficult to open and cannot withstand use. The lower limit value of the bond ratio of the stitch 13 is more preferably 40% or more, and even more preferably 45% or more. The upper limit value is more preferably 65% or less, and even more preferably 55% or less.

[0035] The length of the connecting portion of the stitch 13 and the length of the cutting line are measured with a microscope, and the bond ratio of the stitch 13 (the ratio of the connecting portion of the stitch 13) is determined as follows. Bond ratio of the stitch 13 (%) = Length of the connecting portion of the stitch 13 / (Length of the connecting portion of the stitch 13 + Length of the cutting line of the stitch 13) × 100

[0036] (Strength of the stitch) The lower limit of the tensile strength at the stitch 13 is preferably 12 N / 76.2 mm or more, more preferably 16 N / 76.2 mm or more, and still more preferably 18 N / 76.2 mm or more. The upper limit is preferably 40 N / 76.2 mm or less, more preferably 35 N / 76.2 mm or less, and still more preferably 30 N / 76.2 mm or less. If the tensile strength at the stitch 13 is less than 12 N / 76.2 mm, the stitch 13 will open during packaging, and if it exceeds 40 N / 76.2 mm, the stitch 13 will be difficult to open. The tensile strength at the stitch 13 is measured in accordance with JIS P 8113, and the tensile speed is 300 mm / min.

[0037] (Height of the package) The lower limit of the height of the package 1 is preferably 30 mm or more, more preferably 33 mm or more, and still more preferably 37 mm or more. The upper limit is preferably 70 mm or less, more preferably 60 mm or less, and still more preferably 50 mm or less. If the height of the package 1 is less than 30 mm, the film cost per set of the package 1 will increase, and if it exceeds 70 mm, the compactness of the multi-package 5 will be inferior. The height of the package 1 is measured by placing the sample package 1 on a horizontal table, placing a 15 cm ruler parallel to the width direction at the center of the long side direction of the package 1, and standing it vertically on the horizontal table so that the ruler is perpendicular to the 15 cm ruler (straight ruler, stainless steel, 15 cm, red numbers, JIS, 10 g).

[0038] (Density of the package) The density of the package 1 is 0.18 g / cm 3 or more and 0.24 g / cm 3 or less. If the density is less than 0.18 g / cm 3 , the package 1 is not tight, resulting in poor operability. If the density exceeds 0.24 g / cm 3 , the package 1 is too tight, leading to packaging defects and, as a result, poor operability. The lower limit of the density is preferably 0.19 g / cm 3 or more, more preferably 0.20 g / cm 3 or more. The upper limit is preferably 0.23 g / cm 3 or less, more preferably 0.22 g / cm 3The following is more preferable. The density of the package 1 is calculated by dividing the mass of the tissue laminate 11 by the volume of the package 1.

[0039] (Bulk density of the package) The bulk density of the package 1 is preferably 8.5 sets / mm or more and 11.5 sets / mm or less. Here, the bulk density means the number of sets of the tissue paper 21 laminated per 1 mm in the height direction of the package 1. If the bulk density is less than 8.5 sets / mm, the package 1 is not tight, resulting in poor operability. If the bulk density exceeds 11.5 sets / mm, the package 1 is too tight, leading to packaging defects and, as a result, poor operability. The lower limit value of the bulk density is more preferably 9.0 sets / mm or more, and even more preferably 9.5 sets / mm or more. The upper limit value is more preferably 11.0 sets / mm or less, and even more preferably 10.5 sets / mm or less. The bulk density is calculated by dividing the number of laminated sets of the tissue paper 21 laminated on the tissue laminate 11 by the height of the package 1 (number of laminated sets of the tissue laminate 11 / height of the package 1). Here, for example, when the tissue is V-folded, the number of laminated sets is twice the displayed number of sets.

[0040] (Heat seal part of the package) The package 1 is provided with heat seal parts 12 (hereinafter also referred to as "both-end seals") for sealing the tissue laminate 11 at two positions on the side surface of the package 1, and the tissue laminate 11 is sealed by the heat seal parts 12. The heat seal parts 12 are preferably provided at the overlapping ends of the packaging base material 10. At this time, as shown in FIG. 4, the heat seal parts 12 are preferably formed in a substantially straight line at a position about 10 mm from both ends of the package 1 and the heat seal parts 12 are substantially parallel to each other. However, as long as the sealing property of the package 1 (adhesiveness of the heat seal parts 12) can be ensured, they may be formed at other positions. In the case of pillow packaging, as shown in FIG. 7, in addition to the heat seal parts 12, heat seal parts 16 (hereinafter also referred to as "center seals") for covering the tissue laminate 11 on the bottom surface or the top surface of the package 1 are provided.

[0041] (Heat seal width) The seal width of the heat seal portion 12 is 2 mm or more and 7 mm or less. If the seal width is less than 2 mm, it will lead to packaging (sealing) defects and poor operability. If the seal width exceeds 7 mm, when packaging the package 1 into the multi-package 5, it will lead to tearing of the outer bag 50 and poor operability. The lower limit value of the seal width is preferably 3 mm or more, more preferably 4 mm or more. The upper limit value is preferably 6 mm or less, more preferably 5 mm or less. Here, the seal width is the distance orthogonal to the short side direction of the top surface of the package 1 in the heat seal portion 12 when the surface provided with the outlet 14 of the package 1 is the top surface. Note that the length of the seal width of the heat seal portion 12 is measured in 1 mm units with a 15 cm ruler (a 15 cm straight ruler with red numbers, JIS, 10 g).

[0042] (Packaging form) As the packaging form of the package 1, tube gusset packaging or pillow packaging is preferred. If it is not tube gusset packaging or pillow packaging, the tightness of the package 1 and the stability during operation are inferior.

[0043] (Tube gusset packaging) Tube gusset packaging is, as shown in FIG. 6, formed in a cylindrical shape with both ends of the bottom or the mouth part woven inside as mountain fold parts according to the length (height) of the bag, and the article to be packaged (tissue laminate 11) is inserted from the insertion port 15 inside the packaging base material 10 sealed at one side by the heat seal portion 12, and sealed in a horizontal single row by heat sealing or the like, and is a packaging form cut into individual bags at this sealed part. This tube gusset packaging can be carried out using known devices. Also, the tissue laminate 11 may be inserted with the packaging base material 10 at the insertion port 15 inverted to the outside so as not to be rolled inside.

[0044] (Pillow packaging) Pillow packaging means that, as shown in Fig. 7, the object to be packaged placed above or below the sheet-shaped packaging base material is wrapped cylindrically by overlapping the inner surfaces of both ends of the packaging base material in the width direction and sealing the overlapped part with the heat seal part 16 to form a cylindrical shape, and the part that becomes the bottom or the part that becomes the mouth is sealed with the heat seal part 12 in a horizontal line according to the length (height) of the bag, and it is a packaging form cut into individual bags at this sealed part. This pillow packaging can be carried out using known devices.

[0045] In addition, pillow packaging includes vertical pillow packaging in which the packaging base material is sent in the vertical direction and the object to be packaged is wrapped while being filled from above, and horizontal pillow packaging in which the packaging base material is sent in the horizontal direction and the object to be packaged is wrapped. When packaging the tissue paper 21, horizontal pillow packaging is preferable in view of the packaging speed and the form of the tissue paper 21.

[0046] <Tissue Paper and Tissue Laminate> Fig. 5 is a perspective view showing an example of the tissue laminate 11 packaged in the package 1 in the multi-package 5 of the present invention. Hereinafter, the tissue paper 21 and the tissue laminate 11 will be described in detail.

[0047] <Tissue Paper> The tissue paper 21 included in the tissue laminate 11 is a soft tissue using thin paper. Note that the tissue paper 21 is 2-ply.

[0048] (Basis Weight of Tissue Paper) The basis weight per ply of the tissue paper 21 is 8.0 g / m 2 to 12.0 g / m 2 or less is preferable. If the basis weight is less than 8.0 g / m 2 , the bulk of the package 1 becomes too small, it becomes loose, and the operability deteriorates. If the basis weight exceeds 12.0 g / m 2 , the bulk of the package 1 becomes too high, and the compactness deteriorates. The lower limit value of the basis weight is 9.0 g / m 2The above is more preferable, 10.0 g / m 2 The above is even more preferable. The upper limit is 11.5 g / m 2 The following is more preferable, 11.0 g / m 2 The following is even more preferable. The basis weight per ply of the tissue paper 21 is measured in accordance with JIS P 8124.

[0049] (Thickness of the tissue paper) The lower limit of the thickness of the tissue paper 21 is preferably 0.35 mm / 10 plies or more, more preferably 0.40 mm / 10 plies or more, and even more preferably 0.48 mm / 10 plies or more. The upper limit is preferably 0.80 mm / 10 plies or less, more preferably 0.65 mm / 10 plies or less, and even more preferably 0.58 mm / 10 plies or less. If the paper thickness is less than 0.35 mm / 10 plies, the bulk of the package 1 becomes too small, resulting in a non-tight state and poor operability. If the paper thickness exceeds 0.80 mm / 10 plies, the bulk of the package 1 becomes too large, resulting in poor compactness.

[0050] The (10-ply) thickness of the tissue paper 21 is measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a measuring head diameter of 30 mm. A sample is placed between the measuring head and the measuring table, and the gauge is read when the measuring head is lowered at a speed of 1 mm or less per second. When the tissue paper 21 is 2 plies, five sets of 2-ply tissue paper 21 are stacked and measured as 10 plies, and the measured value is calculated as the 10-ply paper thickness. Also, the measurement is repeated 10 times (measuring 10 different locations instead of the same location 10 times), and the average of the measurement results is taken as the final paper thickness.

[0051] (Tensile strength DMDT of the tissue paper) The dry machine direction tensile strength DMDT (Dry Machine Direction Tensile strength) of the tissue paper 21 is preferably 3.5 N / 25 mm or more and 6.5 N / 25 mm or less. If the tensile strength DMDT is less than 3.5 N / 25 mm, the tissue paper 21 is likely to tear when taken out and cannot withstand use. If the tensile strength DMDT exceeds 6.5 N / 25 mm, the basis weight of the tissue paper 21 becomes high, and as a result, the bulk becomes too high, and the compactness is inferior. The lower limit value of the tensile strength DMDT is more preferably 4.5 N / 25 mm or more, and still more preferably 5.0 N / 25 mm or more. The upper limit value is more preferably 6.3 N / 25 mm or less, and still more preferably 6.0 N / 25 mm or less. Also, the MD direction of the tissue paper 21 is preferably the pulling direction from the take-out port 14.

[0052] (Tensile strength DCDT of tissue paper) The dry cross direction tensile strength DCDT (Dry Cross Direction Tensile strength) of the tissue paper 21 is preferably 1.0 N / 25 mm or more and 2.2 N / 25 mm or less. If the tensile strength DCDT is less than 1.0 N / 25 mm, the tissue paper 21 is likely to tear during use and cannot withstand use. If the tensile strength DCDT exceeds 2.2 N / 25 mm, the basis weight of the tissue paper 21 becomes high, and as a result, the bulk becomes too high, and the compactness is inferior. The lower limit value of the tensile strength DCDT of the tissue paper 21 is more preferably 1.3 N / 25 mm or more, and still more preferably 1.5 N / 25 mm or more. The upper limit value is more preferably 2.0 N / 25 mm or less, and still more preferably 1.8 N / 25 mm or less. Also, the CD direction of the tissue paper 21 is preferably the direction perpendicular (orthogonal direction) to the pulling direction from the take-out port 14.

[0053] The tensile strengths DMDT and DCDT are measured in accordance with JIS P 8113, the tensile speed is 300 mm / min, and the measurement is carried out after maintaining an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23 ± 1°C, 50 ± 2% RH).

[0054] <Tissue laminate> Although the folding method of the tissue paper 21 included in the tissue laminate 11 is not particularly limited, it is preferably V-folded and laminated. By being V-folded, the upper and lower portions of the laminate 11 can be made into a package 1 that is difficult to turn up during packaging. Further, as the processing machine used for V-folding, either an interfolder or a multi-stand type interfolder may be used, but an interfolder is preferred.

[0055] (Number of sets of tissue laminates) The number of sets of two-ply tissue paper 21 included in the tissue laminate 11 is 180 sets or more and 240 sets or less. If the number of sets is less than 180 sets, the cost of the individual packaging film per set of the tissue paper 21 increases. If the number of sets exceeds 240 sets, the compactness of the package 1 is lacking. The lower limit value of the number of sets of the tissue paper 21 is preferably 190 sets or more, more preferably 195 sets or more. The upper limit value is preferably 230 sets or less, more preferably 220 sets or less.

[0056] (Mass of tissue laminate) The lower limit value of the mass of the tissue laminate 11 is preferably 120 g or more, more preferably 130 g or more, and still more preferably 140 g or more. The upper limit value is preferably 178 g or less, more preferably 170 g or less, and still more preferably 160 g or less. If the mass of the tissue laminate 11 is less than 120 g, the basis weight or the number of sets of the tissue decreases, and as a result, the film cost per set increases. If the mass of the tissue laminate 11 exceeds 178 g, the basis weight or the number of sets of the tissue increases and the compactness deteriorates. Incidentally, for the measurement of the mass of the tissue laminate 11, the tissue laminate 11 is taken out from the package 1, and after conditioning at 23°C and 50%, the mass of the tissue laminate 11 is measured with an electronic balance.

[0057] (Length of the long side of the tissue laminate) The lower limit of the long side of the tissue laminate 11 is preferably 155 mm or more, more preferably 160 mm or more, and still more preferably 165 mm or more. The upper limit is preferably 190 mm or less, more preferably 185 mm or less, and still more preferably 180 mm or less. If the long side of the tissue laminate 11 is less than 155 mm, the film cost per weight of one set of tissues increases. If the long side exceeds 190 mm, the compactness of the package deteriorates.

[0058] (Length of the short side of the tissue laminate) The lower limit of the short side of the tissue laminate 11 is preferably 85 mm or more, more preferably 90 mm or more, and still more preferably 95 mm or more. The upper limit is preferably 115 mm or less, more preferably 108 mm or less, and still more preferably 105 mm or less. If the short side of the tissue laminate 11 is less than 85 mm, the film cost per weight of one set of tissues increases. If the short side exceeds 115 mm, the compactness of the package 1 deteriorates.

[0059] In this specification, the long side of the tissue laminate 11 means the longitudinal side of the tissue laminate 11 facing the top surface of the package 1 when the surface provided with the outlet 14 of the package 1 is taken as the top surface. On the other hand, the short side of the tissue laminate 11 means the short-side direction side of the tissue laminate 11 facing the top surface of the package 1 when the surface provided with the outlet 14 of the package 1 is taken as the top surface.

[0060] Note that the long side and the short side of the tissue laminate 11 can be measured as follows. Cut the packaging substrate 10 of the package 1 and gently take out the tissue laminate 11. For the length of the long side, place a 30-cm ruler (Straightedge Silver JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Measurement Co., Ltd.) along the long side direction at the center in the short side direction of the laminate 11 and measure the length of the top surface portion. For the length of the short side, place a 30-cm ruler (Straightedge Silver JIS Class 1, stainless steel, 64 g, manufactured by Shinwa Measurement Co., Ltd.) along the short side direction at the center in the long side direction of the laminate 11 and measure the length of the top surface portion.

[0061] (Height of the tissue laminate) The lower limit of the height of the tissue laminate 11 is preferably 30 mm or more, more preferably 35 mm or more, and still more preferably 40 mm or more. The upper limit is preferably 75 mm or less, more preferably 65 mm or less, and still more preferably 55 mm or less. If the height is less than 30 mm, the tightness of the package 1 is poor, resulting in poor operability. If the height exceeds 75 mm, the compactness of the package 1 is poor.

[0062] The height of the tissue laminate 11 can be measured as follows. After cutting the packaging substrate 10 of the package 1 and gently taking out the tissue laminate 11, place a 30 cm ruler (Straightedge Silver JIS 1st Grade, Stainless Steel, 64 g, manufactured by Shinwa Measurement Co., Ltd.) along the long side direction at the center of the short side direction of the laminate 11, and measure the heights at both ends of the laminate 11. Similarly, place a 30 cm metal ruler along the short side direction at the center of the long side direction of the laminate 11, and measure the heights at both ends of the laminate 11. Average these four values to obtain the final height of the laminate 11.

[0063] (Recovery value of the tissue laminate) The recovery value of the tissue laminate 11 (height of the tissue laminate 11 / height of the package 1 × 100 (%)) is preferably 101% or more and 128% or less. Here, the recovery value of the tissue laminate 11 means the degree of recovery in the height direction of the tissue laminate 11 when the tissue laminate 11 is taken out from the package 1, and is also called the clip recovery value. If the clip recovery value is less than 101%, the package 1 is not tight, resulting in poor operability. If the clip recovery value exceeds 128%, the package 1 is too tight, leading to packaging defects and resulting in poor operability. The upper limit of the clip recovery value is more preferably 125% or less, and still more preferably 123% or less.

[0064] Although the present invention has been described 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 obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. Also, it is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Example

[0065] Hereinafter, the present invention will be described in detail with reference to examples. Note that the present invention is not limited to the examples shown below.

[0066] <Example> Multi-packaging bodies of Examples 1 to 12 and Comparative Examples 1 to 6 were created under the respective conditions shown in Tables 1 to 2. Specifically, a tissue laminate was formed with two sheets of tissue paper as a set, this tissue laminate was packaged with a thermoplastic resin film to create a packaging body, and a plurality of packaging bodies were packaged with an outer bag to produce a multi-packaging body.

[0067] Then, the following three evaluations (evaluation of "operability", evaluation of "compactness", and evaluation based on "production cost") were performed on the multi-packaging bodies of Examples 1 to 12 and Comparative Examples 1 to 6.

[0068] (Operability) Regarding the produced multi-packaging bodies, the operability during production when packaging the packaging body with the outer bag and when packaging the tissue laminate with the thermoplastic resin film was evaluated. The evaluation criteria are as follows. ◎: No defects occurred during operation 〇: Defects occurred at a rate of 1 to 5% during operation △: Defects occurred at a rate of 6 to 10% during operation ×: Defects occurred at a rate of 11% or more during operation

[0069] (Compactness) Regarding the produced multi-packaging bodies, the compactness was evaluated by 30 monitors. The evaluation criteria are as follows. ◎: 28 or more monitors evaluated as having good compactness 〇: 25 to 27 monitors evaluated as having good compactness △: 22 to 24 monitors evaluated as having good compactness ×: 21 or fewer monitors evaluated as having good compactness

[0070] (Production cost) The production cost of the produced multi - package was evaluated. The evaluation criteria are as follows. ◎: 11% or more cheaper in production cost compared to the conventional product 〇: 1 - 10% cheaper in production cost compared to the conventional product △: No change in production cost compared to the conventional product ×: Deterioration in production cost compared to the conventional product

[0071]

Table 1

[0072]

Table 2

[0073] As is clear from the results shown in Tables 1 - 2, all of the multi - packages of Examples 1 - 12 had good operability, compactness, and production cost. On the other hand, all of Comparative Examples 1 - 6 were inferior in any one of operability, compactness, and production cost. From the above, according to this example, it was confirmed that in the multi - package of soft pack tissue, it is possible to provide a multi - package that is excellent in the operability during packaging of the outer bag and the individual packaging base material and the compactness of the product, and has a low production cost.

Explanation of symbols

[0074] 1 (tissue) package 10 Packaging base material 11 (tissue) laminate 12 Heat seal part (both ends seal) 13 Stitch 14 Outlet 15 Insertion port 16 Heat seal part (center seal during pillow packaging) 21 Tissue paper 5 Multi-pack 50 Outer bag

Claims

1. A multi-packaging body comprising a plurality of packaging bodies and an outer bag for packaging the plurality of packaging bodies, The plurality of packages are packaged in the outer bag such that the vertical direction of the outer bag is substantially parallel to the long side direction of the packages, The plurality of packages is 3 or more and 8 or less, The package is a tissue laminate in which 180 to 240 sets of two-ply tissues are laminated together, packaged in a packaging base material made of a thermoplastic resin film, The packaging base material has heat seal portions for sealing the tissue laminate at two locations on the side surface of the packaging body, and the width of the heat seal at the heat seal portions is 2 mm or more and 7 mm or less; The density of the package is 0.18 g / cm ３ 0.24g / cm or more ３ A multi-package comprising:

2. The multi-package described in claim 1, characterized in that the recovery value of the tissue stack when the tissue stack is removed from the package (height of the tissue stack / height of the package x 100 (%)) is 101% or more and 128% or less.

3. 2. The multi-package according to claim 1, wherein the bulk density of the package (number of sets of the tissue stack / height of the package) is 8.5 sets / mm or more and 11.5 sets / mm or less.

4. The tissue has a basis weight of 8.0 g / m per ply. ２ 12.0g / m or more ２ 2. The multi-package of claim 1, characterized in that:

5. The multi-package according to claim 1, wherein the tissue has a tensile strength DMDT in the MD direction when dry based on JIS P 8113 of 3.5 N / 25 mm or more and 6.5 N / 25 mm or less, and a tensile strength DCDT in the CD direction when dry based on JIS P 8113 of 1.0 N / 25 mm or more and 2.2 N / 25 mm or less.

6. The packaging body has a perforation on a top surface thereof for forming an opening for taking out the package. The multi-package body according to claim 1, characterized in that the bond rate of the perforations is 30% or more and 70% or less.

7. The multi-package according to claim 1, characterized in that the packaging form of the packaging body is a tube gusset packaging.

8. The multi-package according to claim 1, characterized in that the packaging form of the packaging body is a pillow package.

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