Packaging

Abstract

The present invention aims to provide a caramel packaging product in which the occurrence of sealing defects is suppressed and the appearance of the packaging is improved. [Solution] The present invention relates to a packaging body in which sanitary tissue paper is folded and stored in a pop-up manner, wherein the top surface of the packaging body has a tear line formed to create an opening for dispensing, the folded and stored sanitary tissue paper is caramel-wrapped, and the compression characteristic (RC) of the bundle of folded and stored sanitary tissue paper is 50% or less.

Description

[Technical Field]

[0001] The present invention relates to a soft pack product packaging in which sanitary tissue paper is folded and stored in a way that allows it to be removed in a pop-up manner. [Background technology]

[0002] Traditionally, cartons that fold and store contents in a pop-up style have been widely used. However, in recent years, the use of soft pack products made from resin film has increased due to their low cost, light weight, and ease of transport.

[0003] For example, Patent Document 1 discloses a flexible film container for accommodating a laminate of tissue paper, from which the tissue paper can be popped out through a slit-shaped outlet, the container having a notch on its upper surface to form an outlet, or a tear line that can be used to form an outlet, and having a flap at at least one end of the outlet that opens outward in the longitudinal direction of the outlet. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2019-63089 [Overview of the project] [Problems that the invention aims to solve]

[0005] In recent years, due to growing environmental awareness, attempts have been made to reduce the size of packaging materials as much as possible in order to reduce the amount of film used in soft pack products. When performing a front seal on soft pack products, it is necessary to overlap the parts to be sealed (the edges of the packaging material), but if the shape of the tissue bundle inside is not stable, it may not be possible to properly overlap the overlapping area for sealing, resulting in sealing defects. When forming the front seal, a heat seal block is pressed against the overlapping area of ​​the film, but if the heat seal block does not make contact with the overlapping part of the film, defects such as failure to weld or holes in the film may occur, leading to product defects and thus becoming a problem.

[0006] Therefore, in order to solve the problems of the prior art, the inventors of this invention proceeded with research with the aim of providing a caramel packaging product in which the occurrence of sealing defects is suppressed and the appearance of the packaging is improved. [Means for solving the problem]

[0007] Examples of specific embodiments of the present invention are shown below.

[0008] [1] A package containing sanitary tissue paper folded and stored in a pop-up manner, wherein the top surface of the package has a tear line for forming an opening, the folded and stored sanitary tissue paper is caramel-wrapped, and the compression characteristic (RC) of the bundle of folded and stored sanitary tissue paper is 50% or less. [2] The packaging according to [1], wherein the compression characteristics (RC) of the packaging are 45% or less. [3] The packaging body according to [1] or [2], wherein the packaging body has a front seal portion on a surface perpendicular to the caramel packaging surface, and the seal pattern of the front seal portion is formed discontinuously in the width direction. [4] The packaging described in [3], wherein the seal pattern of the front seal portion is dotted. [5] The package according to [3] or [4], wherein the seal pattern of the front seal portion is formed in a plurality of stages in the vertical direction. [6] The area of each seal portion constituting the seal pattern of the front seal portion is 5 mm , , , , , , ,

[0012] , ,

[0011] , , , [Figure 4] , , [Figure 3] , [Figure 2] , [Figure 1] , or less / piece, and the package according to any one of [3] to [5]. [7] The package according to any one of [1] to [6], wherein the sanitary tissue paper is a moisturizing tissue paper.

[0009] [A] A package in which sanitary tissue paper is folded and stored so as to be taken out in a pop-up manner, and a cleavage cut line for forming an outlet is formed on the top surface of the package. The folded and stored sanitary tissue paper is caramel-wrapped, and the compression characteristic (RC) of the package is 45% or less. [Advantages of the Invention]

[0010] According to the present invention, in a caramel-wrapped product, it is possible to provide a package in which the occurrence of seal defects is suppressed and the appearance of the package is improved. [Brief Description of the Drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of the package of the present embodiment. [Figure 2] FIG. 2 is a schematic view for explaining the state of the seal pattern of the front seal portion of the package. [Figure 3] FIG. 3 is a schematic view for explaining the state of the seal pattern of the front seal portion of the package. [Figure 4] FIG. 4 is a schematic view for explaining the state of the seal pattern of the front seal portion of the package. [Embodiments for Carrying Out the Invention]

[0012] Hereinafter, the present invention will be described in detail. The following description may be made based on typical embodiments or specific examples, but the present invention is not limited to such embodiments. In this specification, a numerical range represented by "~" means a range including the numerical values described before and after "~" as the lower limit value and the upper limit value.

[0013] (Package) This embodiment is a package in which sanitary tissue paper is folded and stored so as to be taken out in a pop-up manner. A cleavage cut line for forming an outlet is formed on the top surface of the package. The folded and stored sanitary tissue paper is caramel-wrapped, and the compression characteristic (RC) of the bundle of the folded and stored sanitary tissue paper is 50% or less. Note that in this specification, the "top surface" refers to the surface of the package itself and the surface on which an outlet for taking out the sanitary tissue paper in a pop-up manner is formed.

[0014] The compression characteristic (RC) of the bundle of the folded and stored sanitary tissue paper only needs to be 50% or less, preferably 47% or less, more preferably 46% or less, still more preferably 45% or less, and particularly preferably 44% or less. Also, the compression characteristic (RC) of the bundle of the folded and stored sanitary tissue paper is preferably 20% or more, more preferably 22% or more, and still more preferably 25% or more. By setting the compression characteristic (RC) of the bundle of the sanitary tissue paper within the above range, it becomes easy to properly overlap the overlapping margin that becomes the seal portion. As a result, it is possible to suppress the occurrence of seal defects. Also, by setting the compression characteristic (RC) of the bundle of the sanitary tissue paper below the above upper limit value, it is possible to suppress the swelling of the body of the package (the central portion of the package bulges). Note that the compression characteristic (RC) of the bundle of the sanitary tissue paper in this embodiment is the compression characteristic (RC) measured after the package is opened and the tissue bundle as the contents is taken out, but it is also preferable that the compression characteristic (RC) measured for the tissue bundle before being packaged in the manufacturing stage is within the above range.

[0015] The compression characteristics (RC) of a bundle of sanitary tissue paper are measured by the following method. First, the packaging is conditioned for at least 4 hours at a temperature of 23°C and a relative humidity of 50±2% according to the method specified in JIS P8111. Then, the packaging is opened and the tissue bundle is removed. Immediately afterward, the compression characteristics (RC) at the center of the longitudinal direction are measured using a compression tester (KES-G5 handy compression tester manufactured by Kato Tech Co., Ltd.). At that time, measurements are taken at three points on the top surface of the tissue bundle: the center of the longitudinal direction, 15 mm away from each of the short sides of the top surface of the tissue bundle, and the center of the short side, under the measurement conditions described below. (Measurement conditions) Force meter: 1kg Compression (pressure) area: 2cm² 2 Compression speed: 10 mm / min Maximum compressive load (upper limit): 50 gf / cm 2 ) Number of compression repetitions per point: 1 STOROKESET:2 SENS:5

[0016] One method for adjusting the compression characteristics (RC) of a bundle of sanitary tissue paper to a desired range is to appropriately control the compression characteristics (RC) of the tissue bundle before packaging. Alternatively, the compression characteristics (RC) of a bundle of sanitary tissue paper can be adjusted by controlling the number of sheets (sets), basis weight, thickness, and density of the sanitary tissue paper within appropriate ranges. Furthermore, the compression characteristics (RC) of a bundle of sanitary tissue paper can also be controlled by incorporating additives (e.g., humectants) into the sanitary tissue paper.

[0017] The compression characteristics (RC) of the package (a bundle of sanitary tissue paper wrapped in packaging material) are preferably 45% or less, more preferably 42% or less, and even more preferably 40% or less. Furthermore, the compression characteristics (RC) of the package are preferably 17% or more, more preferably 20% or more, and even more preferably 22% or more. By keeping the compression characteristics (RC) of the package within the above range, sealing defects can be more effectively suppressed. In addition, by keeping the compression characteristics (RC) of the package below the above upper limit, bulging of the package (bulging in the center of the package) can be suppressed. The measurement of the compression characteristics (RC) of the package is performed in the same manner as the measurement of the compression characteristics (RC) of the bundle of sanitary tissue paper, except that the package is not opened.

[0018] The compression characteristics (RC) of a package can be adjusted, for example, by controlling the number of sheets (sets) of sanitary tissue paper constituting a bundle, the basis weight, paper thickness, and density of the sanitary tissue paper within an appropriate range. The compression characteristics (RC) can also be controlled by including additives (e.g., humectants) in the sanitary tissue paper. Furthermore, the compression characteristics (RC) can also be adjusted by appropriately selecting the packaging method (e.g., packaging in a compressed state).

[0019] The compression ratio of the packaging is preferably 75% or more, more preferably 80% or more, and even more preferably 85% or more. Furthermore, the compression ratio of the packaging is preferably 145% or less, more preferably 141% or less, and even more preferably 136% or less. The compression ratio of the packaging in this specification can be determined by the following formula (I). Packaging compression ratio = Bulk height of tissue bundle / Height of packaging × 100 (I) Here, the bulkiness of the tissue bundle is calculated as paper thickness × 2 (folded in half with a pop-up mechanism) × number of tissues.

[0020] Figure 1 is a perspective view of the packaging 1 of this embodiment. The packaging 1 is a packaging in which sanitary tissue paper is folded and stored so that it can be removed in a pop-up manner, and the bundle of sanitary tissue paper is caramel-wrapped with packaging material (sheet). As shown in Figure 1, the packaging 1 has a top surface 12. The top surface 12 has a tear line 22 for forming an opening. The tear line 22 may be formed by forming only one line along a predetermined direction (for example, the longitudinal direction), but an annular tear line 22 may be provided as shown in Figure 1. Preferably, the tear line 22 is a perforation line formed by, for example, a perforating blade on the film portion that becomes the top surface 12. By tearing the perforation line with your fingers, an opening is formed for removing sanitary tissue paper having a width approximately the same as the width of the perforation line to the outside. The perforations may be formed to create an ellipse, rectangle, rhombus, or any other arbitrary planar shape, and the opening may be opened by tearing off the area enclosed by the perforations.

[0021] As shown in Figure 1, the bundle of sanitary tissue paper is caramel-wrapped with packaging material (sheets). The state in which the sanitary tissue paper is folded so that it can be removed in a pop-up manner is such that each rectangular piece of sanitary tissue paper is folded in half, and pieces of tissue paper from the stacked sheets below and pieces of tissue paper from the stacked sheets above are inserted between the folded pieces of tissue paper, resulting in a stack of many sheets. As a result, when one sheet (or set) of sanitary tissue paper is removed from the opening of the packaging 1, some of the pieces of tissue paper from the stacked sheets below protrude from the opening and are removed sequentially in a pop-up manner. Examples of folding methods include a repeating two-fold structure (C-hold), a repeating three-fold structure (Z-fold structure), or a repeating structure combining these.

[0022] In this embodiment, the tearing line 22 may be provided in a direction parallel to the edge of the sanitary tissue paper being removed (vertical direction), or in a direction perpendicular to the edge of the sanitary tissue paper being removed (horizontal direction).

[0023] Examples of sanitary tissue paper to be contained in packaging 1 include tissue paper, toilet paper, kitchen paper, paper hand towels, paper cloths, and wipes. Among these, tissue paper is preferred. The tissue paper may also be moisturizing tissue paper containing a humectant.

[0024] Examples of humectants that moisturizing tissue paper may contain include glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, glucose, xylitol, maltose, maltitol, mannitol, trehalose, polyglycerin, lactic acid, sodium lactate, and the like. In this embodiment, by using moisturizing tissue paper as the tissue paper, it becomes easy to adjust the compression characteristics (RC) of the bundle of sanitary tissue paper to a desired range.

[0025] The amount of humectant applied to moist tissue paper is preferably 43% by mass or less, more preferably 40% by mass or less, and even more preferably 38% by mass or less, relative to the total mass of the pulp. Furthermore, the amount of wetting agent applied is preferably 12% by mass or more, more preferably 14% by mass or more, and even more preferably 20% by mass or more, relative to the total mass of the pulp. The amount of humectant applied can be determined from a value measured by quantitative analysis using a gas chromatography flame ionization detector. A humidified moist tissue paper is used as a reference sample, and its mass is measured. Next, acetone extraction is performed using a Soxhlet extractor, the solvent extracted from the sample is dried, and this is subjected to gas chromatography flame ionization detection. The ratio of the total mass of polyols contained in the paper towel used as the sample is defined as the humectant content (mass ratio to pulp, unit: mass%).

[0026] The sanitary tissue paper may be a single-ply product consisting of one sheet, or a multi-ply product consisting of two or more sheets. In this specification, when "one sheet" is used for the sanitary tissue paper 40, it refers to one sheet if it is a single-ply product, and to two or more sheets (i.e., one set) that are stacked together if it is a multi-ply product. The sanitary tissue paper of this embodiment is preferably a 2-ply or 3-ply product.

[0027] The sheets that make up sanitary tissue paper are obtained by papermaking a slurry containing pulp components, which are the fiber raw materials. Examples of pulp components include wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp include hardwood pulp (hardwood kraft pulp (LKP)), softwood pulp (softwood kraft pulp (NKP)), sulfite pulp (SP), dissolved pulp (DP), soda pulp (AP), unbleached kraft pulp (UKP), oxygen-bleached kraft pulp (OKP), and other chemical pulps. Other examples include semi-chemical pulp (SCP), chemigroundwood pulp (CGP), and mechanical pulp (GP), such as crushed wood pulp (TMP, BCTMP), but these are not particularly limited. Examples of non-wood pulps include cotton pulps such as cotton linters and cotton lint, non-wood pulps such as hemp, straw, and bagasse, and cellulose, chitin, and chitosan isolated from sea squirts and seaweed, but are not particularly limited. Examples of deinking pulps include deinking pulp made from recycled paper, but are not particularly limited. The pulp components are not particularly limited and may consist of one type or two or more types, and are appropriately blended in predetermined types and proportions according to the required quality of the sanitary tissue paper. Various chemicals may be added as optional components to ensure required quality and operational stability. Examples of optional components include paper strength enhancers, softeners, bulking agents, dyes, dispersants, water filtration enhancers, pitch control agents, yield enhancers, and sizing agents.

[0028] The basis weight of one ply of sanitary tissue paper is 9 g / m². 2 Preferably, it is 10 g / m2 It is more preferable that it is as described above. Also, the basis weight per ply of the sanitary tissue paper is preferably 25 g / m 2 or less, more preferably 22 g / m 2 or less, and even more preferably 20 g / m 2 or less. By setting the basis weight per ply of the sanitary tissue paper within the above range, it becomes easy to adjust the compression characteristic (RC) of the bundle of sanitary tissue paper to a desired range. The basis weight per ply of the sanitary tissue paper can be measured by the basis weight measurement method of JIS P 8124:1998 after conditioning in an environment (temperature 23 ± 1°C, relative humidity 50 ± 2%) according to JIS P8111:1998.

[0029] The paper thickness of the sanitary tissue paper is preferably 70 μm or more, more preferably 80 μm or more, and even more preferably 90 μm or more. Also, the paper thickness of the sanitary tissue paper is preferably 250 μm or less. By setting the paper thickness of the sanitary tissue paper within the above range, it becomes easy to adjust the compression characteristic (RC) of the bundle of sanitary tissue paper to a desired range. The paper thickness of the sanitary tissue paper is measured in accordance with ISO12625-3 after conditioning in an environment (temperature 23 ± 1°C, relative humidity 50 ± 2%) according to JIS P8111:1998. When the sanitary tissue paper is two plies or more, the above paper thickness is the paper thickness of one set.

[0030] The density of the sanitary tissue paper is preferably 0.161 g / cm 3 or more, more preferably 0.171 g / cm 3 or more. Also, the density of the sanitary tissue paper is preferably 0.260 g / cm 3 or less, more preferably 0.250 g / cm 3 or less. By setting the density of the sanitary tissue paper within the above range, it becomes easy to adjust the compression characteristic (RC) of the bundle of sanitary tissue paper to a desired range. The density of the sanitary tissue paper is calculated by dividing the basis weight by the paper thickness.

[0031] The bundle of sanitary tissue paper formed by folding the tissue paper in a pop-up manner preferably contains 200 or more sheets, more preferably 240 or more sheets. Furthermore, the bundle preferably contains 500 or fewer sheets, and particularly preferably 480 or fewer sheets.

[0032] In the manufacturing process of the bundle of sanitary tissue paper to be stored in the packaging of this embodiment, a known folding device called an interfolder, such as the one described in Japanese Patent Application Publication No. 2014-050619, can be used.

[0033] As shown in Figure 1, the packaging body 1 has a bundle of sanitary tissue paper contained within a sheet of packaging material, and has six faces: a pair of top and bottom faces, a pair of long sides 13, and a pair of short sides 14, giving it the appearance of a roughly rectangular parallelepiped. The shape of the packaging body 1 may also be roughly cubic. In this specification, of the four faces perpendicular to the top face 12, the faces on both sides that are folded and sealed (side seal) (the pair of short sides 14) are referred to as the caramel packaging faces. In this specification, the top side is referred to as the upward direction, the bottom side as the downward direction, and the direction perpendicular to these upward and downward directions is referred to as the left-right direction or width direction. Specifically, in the pair of long sides 13 in Figure 1, the longitudinal direction of the long side 13 corresponds to the width direction.

[0034] In this embodiment, the packaging sheet has a front seal portion 23 on one of the pair of long sides 13. The packaging sheet also has side seal portions 24 on both of the pair of short sides 14. The front seal portion 23 and the side seal portions 24 are sealed by heat sealing or adhesive sealing. In particular, in this embodiment, it is preferable that the front seal portion 23 and the side seal portions 24 are sealed by heat sealing.

[0035] In the front seal portion 23, the seal pattern may be formed continuously in the width direction. For example, as shown in Figure 2, a linear seal pattern may be formed continuously in the width direction. In Figure 2(a), a single linear seal pattern is formed. In addition, multiple layers of such seal patterns may be formed in the vertical direction (the height direction when it is a packaged body), and it is preferable to have two or more layers of seal patterns extending in the width direction, but it is also possible to have three or more layers, or even four or more layers. For example, as shown in Figure 2(b), two linear seal patterns may be formed.

[0036] As described above, the seal pattern in the front seal portion 23 may be formed continuously in the width direction, but in this embodiment, it is preferable that the seal pattern is formed discontinuously in the width direction. For example, the seal pattern is preferably stripe-shaped or dot-shaped, and is particularly preferably dot-shaped. When the seal pattern is dot-shaped, the shape of each seal portion may be polygonal or circular. Among these, it is particularly preferable that the shape of each seal portion be approximately square or circular.

[0037] Figures 3 and 4 illustrate the case where the sealing pattern in the front seal portion 23 is dot-shaped. In Figure 3, the shape of each sealing portion forming the sealing pattern is circular, and in Figure 4, the shape of each sealing portion forming the sealing pattern is rectangular (approximately square). When forming the front seal portion 23, heat sealing is performed by pressing a heat seal block against the overlap of the film. In this case, it is preferable to use a heat seal block such that the sealing pattern is discontinuous in the width direction, and it is even more preferable to use a heat seal block having a striped or dot-shaped surface structure. By performing heat sealing using such a heat seal block, it is possible to suppress excessive heat from being applied to the film, and as a result, it is possible to suppress the occurrence of defects such as holes being made in the film.

[0038] Furthermore, it is preferable that the sealing pattern of the front seal portion be formed in multiple layers in the vertical direction (the height direction when it is a packaged body). For example, when the sealing pattern is dot-shaped, it is preferable to have two or more layers of sealing patterns arranged in a single row in the width direction, and it is also possible to have three or more layers, or even four or more layers. Figure 3(a) shows a configuration in which two layers of sealing portions are formed in a single row in the width direction, and Figure 3(b) shows a configuration in which four layers of sealing portions are formed in a single row in the width direction. By forming multiple layers of sealing patterns in the vertical direction (the height direction when it is a packaged body), heat sealing can be reliably performed even if the position where the heat seal block is in contact is slightly off or the shape of the tissue bundle is unstable, and the occurrence of sealing defects such as peeling off can be suppressed.

[0039] The shape of each sealing portion (unit sealing portion) that constitutes the sealing pattern of the front seal portion is not particularly limited, but for example, it is preferably polygonal or circular, and among these, it is particularly preferably approximately square or circular. By making the shape of each sealing portion (unit sealing portion) as described above, the heat sealing performance can be improved and the occurrence of sealing defects can be suppressed.

[0040] The area of ​​each sealing section (unit sealing section) that makes up the sealing pattern of the front seal section is 5 mm². 2 Preferably, the number of pieces is 4 mm or less. 2 It is more preferable that the number of pieces be less than or equal to 3 mm 2 It is even more preferable that the number of seals is less than or equal to the following. Also, the area of ​​each seal (unit seal) is 0.1 mm². 2 It is preferable that the area be greater than or equal to the above per unit. By keeping the area of ​​each sealing portion (unit sealing portion) within the above range, the flexibility of the front sealing portion can be maintained, and the overall feel of the packaging can be improved. Furthermore, by keeping the area of ​​each sealing portion (unit sealing portion) within the above range, heat sealing can be reliably performed even if the position where the heat sealing block is in contact is slightly off or the shape of the tissue bundle is unstable, thereby suppressing the occurrence of sealing defects.

[0041] When the sealing pattern of the front seal portion is provided discontinuously, the average distance between each sealing portion (unit sealing portion) is preferably 10 mm or less, more preferably 8 mm or less, even more preferably 6 mm or less, and particularly preferably 4 mm or less. Furthermore, the average distance between each sealing portion (unit sealing portion) is preferably 0.5 mm or more.

[0042] The packaging material, or sheet, is preferably a resin film. Specific examples of resin films include single-layer films of polyethylene film, polypropylene film, polyester film, polyethylene terephthalate film, nylon film, vinylidene chloride film, or ethylene vinyl alcohol copolymer, or laminate films appropriately laminated with these films, or gas barrier films obtained by surface treatment such as aluminum vapor deposition on these films. Furthermore, from the viewpoint of environmental protection, it is desirable to use biomass films derived from plant materials such as sugarcane, sweet potatoes (starch), and corn. From the viewpoint of cost, polypropylene film is preferred, and polyethylene film is more preferred. The resin film may be a laminate film formed by laminating multiple films, or a film made of a mixture of two or more of the above-mentioned resins. In this embodiment, it is preferable that the packaging material (sheet) itself has heat-sealing properties, and it is particularly preferable that the resin film is a heat-sealing resin film.

[0043] A heat-seal layer may be provided separately on the resin film. The heat-seal layer is a layer containing a heat-sealing agent. The heat-sealing agent is a material that exhibits heat-sealing properties by softening and liquefying when heated and solidifying when cooled. Therefore, by applying heat to the heat-seal layer provided on the sheet substrate, the sheet substrates can be bonded together.

[0044] The materials constituting the heat seal layer are not particularly limited, and for example, polyolefin resins and other thermoplastic resins can be used. Among these, polyolefin resins are preferred. Examples of such materials include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-α·olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ionomer, amorphous polyester, polypropylene, styrene-acrylic copolymer, propylene-ethylene copolymer (preferably a copolymer with an ethylene content of 10 mol% or less), or polypropylene resins obtained by graft polymerization or copolymerization of polypropylene with unsaturated carboxylic acids, unsaturated carboxylic acid anhydrides, ester monomers, etc., medium-density polyethylene, etc. The materials constituting the heat seal layer may be used individually or in combination of two or more types.

[0045] When forming a heat seal layer on a sheet, it can be formed by commonly used methods, such as extruding a thermoplastic resin such as a polyolefin resin or a composition containing a thermoplastic resin onto a sheet substrate; using a known heat seal processing apparatus (lamination processing apparatus) to attach a film made of or containing a thermoplastic resin to a sheet substrate; or by coating a sheet substrate with an aqueous heat seal agent obtained by dissolving or dispersing a thermoplastic resin or thermoplastic resin composition in water, or a solvent-based heat seal agent obtained by dissolving or dispersing a thermoplastic resin or thermoplastic resin composition in a solvent, using known methods such as roll coating, gravure roll coating, or kiss coating.

[0046] The packaging material (sheet) constituting the packaging body 1 is preferably a resin film, but laminated paper containing a paper base material can also be used as the packaging material (sheet) constituting the packaging body 1.

[0047] When the packaging material is laminated paper containing a paper base material, the paper base material is preferably a layer mainly composed of pulp. Examples of pulp components include those mentioned above. Specific examples of paper base materials include bleached kraft paper, unbleached kraft paper, fine paper, cardboard, liner paper, coated paper, glossy paper, glassine paper, and graphane paper. In addition, various chemicals may be added to the paper base material as optional components. Examples of optional components include paper strength enhancers, softeners, bulking agents, dyes, dispersants, water filtration enhancers, pitch control agents, yield enhancers, and sizing agents.

[0048] When a packaging material containing a paper substrate is formed by applying a heat sealant to the paper substrate, a heat seal layer and / or adhesive layer are provided on the paper substrate. The heat seal layer and adhesive layer may be laminated over the entire surface of at least one side of the paper substrate, or they may be partially arranged, such as in a front seal portion or a side seal portion. It is preferable that the heat seal layer and adhesive layer be provided on the surface side of the paper substrate or on a printed layer applied to the surface side.

[0049] The thickness of the packaging material (sheet) is preferably 25 μm or more, and preferably 50 μm or less. Here, the sheet thickness is the value measured using a thickness gauge L&W 251 (manufactured by L&W) in accordance with JIS P 8118:2014 after the sheet has been conditioned for 48 hours or more at a temperature of 23°C and a relative humidity of 50 ± 2%. If the sheet has a multilayer structure, it is preferable that the sum of the thicknesses of each layer is within the above range.

[0050] The tensile strength of the packaging material (sheet) in the longitudinal direction (MD direction: Machine Direction) is preferably 5 N / cm or more and 45 N / cm or less. The tensile strength of the packaging material (sheet) in the transverse direction (TD direction: Transverse Direction) is preferably 6 N / cm or more and 30 N / cm or less.

[0051] The tensile strength of the packaging material (sheet) is measured for one sheet using a method compliant with JIS K 7127:1999. The test specimens used to measure the tensile strength of the sheet are prepared as follows: First, the sheet is conditioned for 48 hours or more at a temperature of 23°C and a relative humidity of 50±2%. Then, using a dumbbell-shaped test specimen type 5 (width of the narrow parallel section 6.0 mm) as described in JIS K 7127:1999, two types of test specimens are prepared by punching out test specimens from the sheet in each direction. Next, the prepared test specimens are mounted on a tensile testing machine (A&D RTG-1310) with a grip distance of 80 mm, and pulled at a tensile speed of 500 mm / min until the test specimen breaks. The tensile strength is defined as the value obtained by dividing the load at the time of breakage by the initial cross-sectional area of ​​the test specimen (i.e., width × thickness of the narrow parallel section in the center of the dumbbell) (unit: MPa).

[0052] The tear strength of the packaging material (sheet) in the longitudinal direction (MD direction) is preferably 0.1N or more and 20N or less. The tear strength of the packaging material (sheet) in the transverse direction (TD direction) is preferably 0.1N or more and 20N or less.

[0053] The tear strength of the packaging material (sheet) is measured for one sheet using a method compliant with JIS K 8116:2000. The test specimens used to measure the tensile strength of the sheet are prepared as follows: First, the sheet is conditioned at a temperature of 23°C and a relative humidity of 50±2% for at least 48 hours. Then, the sheet is cut to a size of 76 mm × 63 mm to prepare two types of test specimens (longitudinal and transverse directions). Next, the prepared test specimens are mounted on an Elmendorf type tear tester SA-W (manufactured by Toyo Seiki Co., Ltd.), a 20 mm cut is made, and then the tear test is performed.

[0054] When the packaging material is a resin film, it is preferable that the resin film has a printing layer. The printing layer is a layer for applying figures and characters to the packaging to add information such as patterns, logos, and messages. Such a printing layer may be provided on the entire surface of the resin film. However, if a printing layer is provided on each sealing portion, it is preferable that the printing layer is provided so that it does not directly come into contact with the product inside or the sealing equipment at the sealing portion.

[0055] In manufacturing the packaging 1 of this embodiment, a bundle of sanitary tissue paper, which is folded in a pop-up manner to allow for easy removal, is wrapped in a packaging material (sheet) to form a tube and sealed (front seal). In this state, the flap-like edges on both sides are folded together and sealed (side seal) to seal the package. This type of packaging is called caramel packaging. Caramel packaging can be performed using known equipment.

[0056] When packaging or heat-sealing bundles of sanitary tissue paper, the packaging may be compressed to a compression ratio of 75% or more, preferably 80% or more, and more preferably 85% or more. Furthermore, the resulting packaging compression ratio is preferably 145% or less, more preferably 141% or less, and even more preferably 136% or less. The compression ratio of the packaging in this specification can be determined by the following formula (I). Packaging compression ratio = Bulk height of tissue bundle / Height of packaging × 100 (I) Here, the bulkiness of the tissue bundle is calculated as paper thickness × 2 (folded in half with a pop-up mechanism) × number of tissues.

[0057] In this embodiment, heat sealing is preferred when sealing the packaging material, and when forming the front seal portion, it is preferable to use a heat seal block such that the seal pattern is continuous or discontinuous in the width direction, more preferably a heat seal block such that the seal pattern is discontinuous, even more preferably a heat seal block having a stripe-like or dot-like surface structure, and particularly preferably a heat seal block having a dot-like surface structure. It is preferable that protrusions corresponding to the seal pattern are formed on the surface of the heat seal block. When the seal pattern is dot-like, the area of ​​each protrusion provided on the surface of the heat seal block is 5 mm². 2 Preferably, the number of pieces is 4 mm or less. 2 It is more preferable that the number of pieces be less than or equal to 3 mm 2 It is even more preferable that the number of protrusions be less than or equal to the following. Also, the area of ​​each protrusion should be 0.1 mm². 2 It is preferable that the number be greater than or equal to one per person.

[0058] When performing heat sealing using a heat seal block, the heat seal temperature is preferably 150-250°C, and more preferably 180-230°C. The heat seal time and heat seal pressure should be adjusted as appropriate, taking into account the type and thickness of the packaging material. [Examples]

[0059] The features of the present invention will be further described below with reference to examples and comparative examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be interpreted as being limited by the following specific examples.

[0060] [Preparation of packaging materials and packaging bodies] (Example 1) A PE film with a thickness of 35 μm (a mixed resin film of LDPE (low-density polyethylene) and LLDPE (linear low-density polyethylene)) was used as the base material for the sheet. First, printing was performed on one side of the base material, excluding the areas that would become the front seal and side seal when the package is assembled. Next, a tear line was formed on the top surface of the package, along the MD direction of the base material, to create the packaging material.

[0061] With the printed side of the prepared packaging material facing inward, a bundle of tissues (150 pairs) made of stacked tissues as shown in Table 1 was wrapped in the packaging material. The tissue bundle was compressed to the compression ratio shown in Table 1, and the front seal portion was formed by overlapping both ends of the packaging material in the CD direction and heat sealing. When forming the front seal portion, square unit seal portions, each 1 mm in height and 1 mm in width, were arranged at equal intervals in the width direction and in four rows in the vertical direction, and heat sealing was performed at 200°C. Subsequently, the packaging body shown in Figure 1 was produced by overlapping both ends of the packaging material in the MD direction and caramel wrapping. In Example 1, the tissue bundle was packaged so that the direction of tissue removal was the vertical direction of the tissue.

[0062] (Examples 2-11) The tissue bundles shown in Table 1 were packaged, and the packaging was manufactured in the same manner as in Example 1, except that the configuration of the unit seal when forming the front seal was changed as shown in Table 1. In Example 5, the tissues were packaged so that they were dispensed horizontally. In Example 6, 16% by mass of humectant was applied to the total mass of pulp, in Example 7, 28% by mass of humectant was applied to the total mass of pulp, and in Example 8, 38% by mass of humectant was applied to the total mass of pulp. The heat sealing temperature when forming the front seal was 210°C in Example 2, 180°C in Example 9, 190°C in Example 10, and 230°C in Example 11, and 200°C in the other examples, the same as in Example 1.

[0063] (Comparative Example 1) The packaging was prepared in the same manner as in Example 1, except that the tissue bundles shown in Table 1 were packaged.

[0064] (Comparative Example 2) The packaging was prepared in the same manner as in Example 1, except that the tissue bundles shown in Table 1 were packaged.

[0065] [Measurement of packaging] <Packaging size> The width, height, and depth of the packaging were measured using the following method. First, the packaging was placed on a horizontal surface with the front seal facing forward. A 300 mm stainless steel ruler (Grade 1) was then placed on the center of the top surface of the packaging, parallel to the longitudinal direction of the top surface. Next, the distance from the horizontal surface to the stainless steel ruler was measured at both ends of the longitudinal direction using another metal ruler (Grade 1), and the average value was defined as the "packaging height." In addition, the length of the short side of the top surface was measured at three points: both ends of the longitudinal direction and the center, using a stainless steel ruler, and the average value was defined as the "packaging depth." Furthermore, the length of the long side of the top surface was measured at three points: both ends of the short side and the center, using a stainless steel ruler, and the average value was defined as the "packaging width."

[0066] <Compression characteristics (RC)> The packaging of each example and comparative example was conditioned for at least 4 hours at a temperature of 23°C and a relative humidity of 50±2% according to the method specified in JIS P8111. Then, the compression characteristics (RC) at the center of the longitudinal direction were measured using a compression tester (handheld compression tester KES-G5 manufactured by Kato Tech Co., Ltd.). Specifically, measurements were taken at three points on the top surface of the packaging, at the center of the longitudinal direction, 15 mm away from each end of the short-side of the packaging, and at the center of the short-side, under the following measurement conditions. The average of the three measured values ​​was taken as the compression characteristics (RC). (Measurement conditions) Force meter: 1kg Compression (pressure) area: 2cm² 2 Compression speed: 10 mm / min Maximum compressive load (upper limit): 50 gf / cm 2 Number of compression repetitions per point: 1 STOROKESET:2 SENS:5

[0067] <Compression ratio> The compression ratio of the packaging was calculated using the following formula (I). Packaging compression ratio = Bulk height of tissue bundle / Height of packaging × 100 (I) Here, the bulkiness of the tissue bundle was calculated as paper thickness × 2 (folded in half with a pop-up mechanism) × number of tissues.

[0068] [Measurement of contents (bundle of tissues)] <Compression characteristics (RC)> The packaging for each example and comparative example was conditioned for at least 4 hours at a temperature of 23°C and a relative humidity of 50±2% according to the method specified in JIS P8111. After that, the packaging was opened and the tissue bundles contained within were removed. Immediately afterward, the compression characteristics (RC) at the center of the longitudinal direction were measured using a compression tester (KES-G5 handy compression tester manufactured by Kato Tech Co., Ltd.). Specifically, measurements were taken at three points on the top surface of the tissue bundle, at the center of the longitudinal direction, 15 mm away from each of the short-side ends of the top surface of the tissue bundle, and at the center of the short-side, under the following measurement conditions. The average of the three measured values ​​was taken as the compression characteristics (RC). (Measurement conditions) Force meter: 1kg Compression (pressure) area: 2cm² 2 Compression speed: 10 mm / min Maximum compressive load (upper limit): 50 gf / cm 2 ) Number of compression repetitions per point: 1 STOROKESET:2 SENS:5

[0069] <Bulkiness> The bulkiness of the tissue bundle was calculated as paper thickness × 2 (for a pop-up mechanism folded in half) × number of tissues.

[0070] <Basic weight> The basis weight per tissue was measured in accordance with JIS P8124:1998 after humidification under conditions conforming to JIS P8111:1998 (temperature 23±1℃, relative humidity 50±2%). Specifically, for 2-ply tissue, 5 sets (10 sheets) were cut into 100mm x 100mm sections, and the weight was measured and divided by the total area (100mm x 100mm x 10 sheets) to calculate the basis weight per sheet.

[0071] <Paper thickness> The paper thickness per tissue pack was measured in accordance with ISO 12625-3 after conditioning the tissues under conditions conforming to JIS P8111:1998 (temperature 23±1℃, relative humidity 50±2%).

[0072] <density> The density per tissue pack was calculated by dividing the product basis weight by the paper thickness (product basis weight (basis weight × number of plies) / paper thickness (per pack)).

[0073] <Sheet dimensions> • When measuring the dimensions of the tissue, the tissue was conditioned in an environment conforming to JIS P8111:1998 (temperature 23±1℃, relative humidity 50±2%), and then the length of the edge of the sheet was measured. The edges of three sheets were measured, and the average value was used.

[0074] <Dry Tensile Strength> The dry tensile strength of each tissue was measured in accordance with JIS P 8113:2006 after conditioning the tissues under conditions conforming to JIS P 8111:1998 (temperature 23±1°C, relative humidity 50±2%). A horizontal tensile testing machine (manufactured by Kumagai Riki Kogyo Co., Ltd.) was used to measure the dry tensile strength in both the longitudinal and transverse directions.

[0075] <Evaluation of front seal adhesion> One hundred of each of the example and comparative example packaging units were produced in continuous production, and the adhesiveness of the front seal portion was evaluated according to the following criteria. <Peeling off> When the film edge of the front seal (the end of the film in the direction of the CD) was pinched with fingers and lifted, the front seal peeled off due to the weight of the product, exposing the tissue. If this occurred, the product was considered defective, and the number of defects was counted. ○: No defects occurred. △: 1 to 3 defects ×: Four or more defective items <Perforated> Areas on the side with the front seal where the tissue bundle was exposed were considered to have a hole defect, and the number of defects was counted. ○: No defects occurred. △: 1 to 3 defects ×: Four or more defective items

[0076] <Evaluation of a chubby body> For 10 packaged tissue bundles of the examples and comparative examples, the difference in height between the center and the ends of the tissue bundle in its packaged state was measured and evaluated according to the following criteria. ○: Difference of 2mm or less △: Difference greater than 2mm and less than 5mm ×: Difference of 5mm or more

[0077] [Table 1]

[0078] In the embodiment, a package was obtained in which the occurrence of sealing defects was suppressed and the appearance of the package was improved. [Explanation of symbols]

[0079] 1 package 12 Top surface 13 Long side 14 Short side 22 Cut line for cleavage 23 Front seal section 24 Side seal section

Claims

1. A packaging body in which sanitary tissue paper is folded and stored in a way that allows it to be removed in a pop-up manner, The top surface of the aforementioned packaging has a tear line formed to create an opening for dispensing. The folded and stored sanitary tissue paper is caramel-wrapped, A packaging in which the compression characteristics (RC) of the folded and stored bundle of sanitary tissue paper are 50% or less.

2. The packaging according to claim 1, wherein the compression characteristics (RC) of the packaging are 45% or less.

3. The packaging has a front seal portion on a surface perpendicular to the caramel packaging surface, The packaging body according to claim 1 or 2, wherein the sealing pattern of the front sealing portion is formed discontinuously in the width direction.

4. The packaging body according to claim 3, wherein the sealing pattern of the front sealing portion is dotted.

5. The packaging body according to claim 3, wherein the sealing pattern of the front sealing portion is formed in multiple stages in the vertical direction.

6. The area of ​​each sealing portion constituting the sealing pattern of the front seal portion is 5 mm ２ The packaging according to claim 3, wherein the number of pieces is less than or equal to the following.

7. The packaging according to claim 1 or 2, wherein the sanitary tissue paper is moisturizing tissue paper.

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