Packaging

Abstract

The present invention aims to provide a hygienic tissue paper packaging for caramel products in which the contents cannot be clearly seen through the seal. [Solution] 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, wherein a tear line for forming an opening is formed on the top surface of the packaging body, the folded and stored sanitary tissue paper is caramel-wrapped, and the parallel light transmittance of the sheet constituting the seal portion of the packaging body is 60% 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 conventional soft pack products, a sheet of packaging material is used to wrap and seal a laminate of sanitary tissue paper (front seal), and then both sides are folded and sealed (side seal). In this process, printing is often applied to the inside of the sheet, but when heat is applied to the sealed area, a portion of the sheet melts, weakening the adhesion between the sheet and the printing ink, and causing the ink to transfer to the laminate of sanitary tissue paper. On the other hand, if printing is applied to the outside of the sheet, the ink will transfer to the equipment, and furthermore, dirt from the equipment will transfer to the surface of the sealed area, contaminating the packaging, making it difficult to print on the sealed area. For this reason, the sealed area has been left transparent without printing.

[0006] In so-called "caramel packaging," where a sheet of packaging material wraps and seals a laminate of sanitary tissue paper (front seal), and then folds and seals both sides (side seal), the product is wrapped and sealed in a compressed state, and the sides are folded and pressed against the product to seal. As a result, each sealed area is in contact with the product inside, and if the sealed area is made of a transparent sheet, the contents become clearly visible. While high visibility of the contents makes it easy to check the remaining amount, it can also detract from the premium feel of the packaging itself, which has been a problem.

[0007] 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 hygienic tissue paper packaging for caramel packaging products in which the contents cannot be clearly seen from the sealed portion. [Means for solving the problem]

[0008] Examples of specific embodiments of the present invention are shown below.

[0009] [1] A packaging 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 packaging has a tear line to form an opening for dispensing. The folded tissue paper was wrapped in caramel-like packaging. A package in which the parallel light transmittance of the sheet constituting the seal portion of the package is 60% or less. [2] The packaging according to [1], wherein the degree of cloudiness of the sheet constituting the seal portion of the packaging is 35% or more. [3] The packaging according to [1] or [2], wherein the total light transmittance of the sheet constituting the seal portion of the packaging is 90% or less. [4] The packaging according to any one of [1] to [3], wherein the sheets constituting the packaging are made of resin film. [5] The packaging according to [4], the resin film comprising a filler. [6] The packaging according to [4] or [5], wherein the resin film constituting the seal portion of the packaging has a printed layer. [7] The packaging body according to [6], wherein the packaging body has a side seal portion on the caramel packaging surface, and the resin film constituting the side seal portion has a printed layer. [8] The packaging body according to [6], wherein the packaging body has a front seal portion on a surface perpendicular to the caramel packaging surface, and the resin film constituting the front seal portion has a printed layer. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a hygienic tissue paper packaging for caramel products in which the contents cannot be clearly seen from the sealed portion. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a perspective view of the packaging according to this embodiment. [Modes for carrying out the invention]

[0012] Hereinafter, the present invention will be described in detail. The following description may be made based on representative embodiments and 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. On the top surface of the package, a scoring line for forming an outlet is formed. The folded and stored sanitary tissue paper is caramel-wrapped, and the parallel light transmittance of the sheet constituting the seal portion in the package is 60% 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] FIG. 1 is a perspective view of the package 1 of this embodiment. The package 1 is a package in which sanitary tissue paper is folded and stored so as to be taken out in a pop-up manner, and the laminate of the sanitary tissue paper is caramel-wrapped by a packaging material (sheet). As shown in FIG. 1, the package 1 has a top surface 12. On the top surface 12, a scoring line 22 for forming an outlet is formed. The scoring line 22 may be formed as only one along a predetermined one direction (for example, the longitudinal direction), but as shown in FIG. 1, an annular scoring line 22 may be provided. The scoring line 22 is preferably a perforation line formed by, for example, a sewing machine blade in the film portion that becomes the top surface 12. By breaking the perforations of the perforation line with fingers, an outlet for taking out the sanitary tissue paper having a width substantially the same as the width of the perforation line to the outside is formed. Note that the perforation line may be formed so as to draw an elliptical, rectangular, rhombic, or any other arbitrary planar shape, and the outlet may be opened by separating the region surrounded by the perforations.

[0015] As shown in FIG. 1, the laminate of sanitary tissue paper is caramel-wrapped with a packaging material (sheet). Note that the state where the sanitary tissue paper is folded in a pop-up manner and can be taken out means that each rectangular sanitary tissue paper is folded in two, and between the two folded tissue paper pieces, the tissue paper pieces of the tissue paper laminated below and the tissue paper pieces of the tissue paper laminated above are inserted, and a large number of sheets are laminated. Thus, when one sheet (or one set) of sanitary tissue paper is taken out from the outlet of the package 1, a part of the tissue paper pieces of the tissue paper laminated below protrudes from the opening and is sequentially taken out in a pop-up manner. Examples of the folding method include, in addition to the double-fold repeating structure (C-fold), the triple-fold repeating structure (Z-fold structure), or a repeating structure combining these.

[0016] Examples of the sanitary tissue paper contained in the package 1 include sanitary tissue papers such as tissue paper, toilet paper, kitchen paper, paper hand towel, paper dishcloth, and wiper. The sanitary tissue paper may be a single-ply product composed of one sheet, or a multi-ply product composed of two or more sheets. In this specification, when referring to "one sheet" of the sanitary tissue paper 40, it refers to one sheet in the case of a single-ply product, and in the case of a multi-ply product, it refers to two or more sheets (i.e., one set) of sheets stacked together.

[0017] 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.

[0018] The basis weight of a single ply of sanitary tissue paper is 10-25 g / m². 2 It is preferable that the material is such that the thickness is 30 to 200 μm. The basis weight of one ply of sanitary tissue paper can be measured according to the basis weight measurement method of JIS P 8124 (1998).

[0019] The laminate, formed by folding sanitary tissue paper in a pop-up manner, preferably contains 50 or more sheets (sets) of sanitary tissue paper, and more preferably 100 or more sheets (sets). Furthermore, the laminate contains 500 or fewer sheets (sets) of sanitary tissue paper, and more preferably 400 or fewer sheets (sets).

[0020] In the manufacturing process of the laminate 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.

[0021] In this embodiment, when a laminate of sanitary tissue paper is placed in the packaging material (sheet), the compression ratio of the packaging is preferably 94% or more, more preferably 96% or more, and even more preferably 98% or more. Furthermore, the compression ratio of the packaging is preferably 108% or less, more preferably 105% or less, and even more preferably 103% or less. In this embodiment, the laminate of sanitary tissue paper is wrapped and sealed in a compressed state, and the sides are folded and pressed against the product to seal. As a result, each sealed portion is in contact with the product inside, so if the sealed portion is a transparent sheet, the contents will be easily visible. However, by packaging the sanitary tissue paper using the packaging material (sheet) of this embodiment, it is possible to make it difficult to see the contents from the sealed portion. This enhances the design of the packaging 1, and as a result, a packaging with a high-class feel can be obtained.

[0022] The compression ratio of the packaging in this specification can be determined by the following formula (I). Packaging compression ratio = Packaging circumference / Theoretical circumference calculated from the outer dimensions of the tissue layer (I) Here, the perimeter of the packaging is calculated as (packaging height + packaging depth) × 2, and the theoretical perimeter calculated from the outer dimensions of the tissue stack is calculated as (tissue thickness (number of sets) × 2 × number of sets + depth of tissue stack) × 2.

[0023] As shown in Figure 1, the packaging body 1 has a laminate of sanitary tissue paper contained within a sheet of packaging material, and has six faces: a pair of top and bottom surfaces, a pair of long sides 13, and a pair of short sides 14, giving it the shape 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 surface 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.

[0024] 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.

[0025] When the front seal portion 23 and the side seal portion 24 are sealed using an adhesive, it is preferable to provide an adhesive layer between the sheets. Also, when the front seal portion 23 and the side seal portion 24 are sealed by heat sealing, a heat seal layer may be provided between the sheets, but the sheets themselves may also have heat sealability. If the sheets themselves have heat sealability, a heat seal layer may not be provided. The packaging material sheets can have layer configurations such as a single sheet, a sheet base material / heat seal layer, a sheet base material / adhesive layer, a sheet base material / heat seal layer / adhesive layer, or a sheet base material / adhesive layer / heat seal layer. Furthermore, when packaging caramel, the heat seal layers or adhesive layers may not come into contact with each other, so they may be bonded together with glue or hot melt adhesive during packaging. In this case, the glue or hot melt adhesive corresponds to the adhesive layer.

[0026] The adhesive constituting the adhesive layer is not particularly limited, and any known adhesive can be used. For example, ethylene-based adhesives, two-component curing urethane-based adhesives, polyester urethane-based adhesives, polyether urethane-based adhesives, acrylic-based adhesives, styrene-acrylic-based adhesives, polyester-based adhesives, polyamide-based adhesives, polyvinyl acetate-based adhesives, epoxy-based adhesives, rubber-based adhesives, etc., can be used. The adhesive layer can be formed by coating with the adhesive using known methods such as roll coating, gravure roll coating, or kiss coating.

[0027] The heat seal layer is a layer containing a heat sealant. The heat sealant is a material that softens and liquefies when heated, and solidifies when cooled, thereby exhibiting heat-sealing properties. Therefore, by applying heat to the heat seal layer provided on the sheet substrate, the sheet substrates can be bonded together. Furthermore, it is possible to apply the heat sealant to the sheets within the packaging process equipment, then overlap or fold the sealed sections and apply heat to bond them. Alternatively, the heat sealant can be applied and bonded using a hot melt application device during the overlapping or folding process.

[0028] 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.

[0029] 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.

[0030] Examples of packaging materials (sheets) constituting the packaging body 1 include resin films. Specific examples of resin films include single-layer films of polyethylene film, polypropylene film, polyester film, polyethylene terephthalate film, nylon film, vinylidene chloride film, 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.

[0031] When the packaging material is a resin film, it is preferable that the resin film contains a filler. Examples of fillers that can be used include silica, diatomaceous earth, alumina, titanium dioxide, magnesium oxide, pumice powder, pumice balloons, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite, calcium sulfate, potassium titanate, barium sulfate, calcium sulfite, talc, clay, mica, asbestos, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, molybdenum sulfide, calcium carbonate, etc. Among these, it is preferable that the resin film contains talc.

[0032] When the resin film contains a filler, the filler content is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 2% by mass or more, relative to the total mass of the resin film. Furthermore, the filler content is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less, relative to the total mass of the resin film. By setting the filler content in the resin film within the above range, it becomes easier to set the optical properties of the resin film to the desired conditions, as will be described later. Moreover, the filler is more preferably a material that reflects light, such as a white material, or a transparent or translucent material that transmits light. With respect to light passing through the resin film, the filler obstructs straight-line light rays, and the reflection and transmission make the light more easily diffused, so the effect can be obtained with a smaller content.

[0033] 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. In this case, the basis weight of the paper base material is 50 g / m². 2 Preferably, it is 40 g / m 2 The following is more preferable. The basis weight of the paper substrate is 10 g / m². 2 The above is preferable. The basis weight of the paper substrate is measured according to the basis weight measurement method of JIS P 8124 (1998).

[0034] 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.

[0035] 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.

[0036] When the packaging material is laminated paper containing a paper base material, the paper base material content relative to the total mass of the laminated paper is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 65% ​​by mass or more.

[0037] In this embodiment, the parallel light transmittance of the sheet constituting the seal portion of the packaging is preferably 60% or less, more preferably 55% or less, even more preferably 50% or less, and particularly preferably 45% or less. The lower limit of the parallel light transmittance of the sheet is not particularly limited and may be 0%. Here, the parallel light transmittance of the packaging material (sheet) is measured using a haze meter HM-150 (manufactured by Murakami Color Technology Laboratory, D65 light source) in accordance with JIS K 7361-1:1999 after humidifying the sheet at a temperature of 23°C and a relative humidity of 50±2% for 48 hours or more. The above parallel light transmittance is the parallel light transmittance of one sheet constituting the seal portion. In this embodiment, by setting the parallel light transmittance of the sheet forming the seal portion when the packaging is made to the above range, it is possible to suppress the visibility of the contents from the seal portion. This makes it possible to obtain a packaging with excellent design. Here, parallel light transmittance is the proportion of light transmitted linearly among the light transmitted through the sheet. By controlling the proportion of light transmitted linearly to the extent described above, the proportion of light transmitted linearly can be reduced. This reduces the amount of light available to see the contents of the packaging, thereby lowering the visibility of the contents.

[0038] In this embodiment, the sealing portion may be a side sealing portion or a front sealing portion, but preferably the parallel light transmittance of one sheet constituting the side sealing portion is within the above range, and more preferably the parallel light transmittance of one sheet constituting both the side sealing portion and the front sealing portion is within the above range.

[0039] The degree of haze of the sheet constituting the seal portion of the packaging is preferably 35% or higher, more preferably 40% or higher, even more preferably 45% or higher, and particularly preferably 50% or higher. The upper limit of the sheet's haze is not particularly limited and may be 100%. Here, the degree of haze of the packaging material (sheet) is measured using a haze meter HM-150 (manufactured by Murakami Color Technology Laboratory, D65 light source) in accordance with JIS K 7136:2000 after humidifying the sheet at a temperature of 23°C and a relative humidity of 50±2% for 48 hours or more. The above degree of haze refers to the haze of a single sheet constituting the seal portion. In this embodiment, by keeping the degree of haze of the sheet forming the seal portion within the above range, it is possible to suppress the visibility of the contents from the seal portion. This makes it possible to obtain a packaging with excellent design.

[0040] In this embodiment, the sealing portion may be a side sealing portion or a front sealing portion, but preferably the degree of cloudiness of one sheet constituting the side sealing portion is within the above range, and more preferably the degree of cloudiness of one sheet constituting both the side sealing portion and the front sealing portion is within the above range.

[0041] The total light transmittance of the sheet constituting the seal portion of the packaging is preferably 90% or less, more preferably 89.8% or less, and preferably 89.6% or less. The lower limit of the total light transmittance of the sheet is not particularly limited and may be 0%. Here, the total light transmittance of the packaging material (sheet) is measured using a haze meter HM-150 (manufactured by Murakami Color Technology Research Institute, D65 light source) in accordance with JIS K 7361-1:1999 after humidifying the material for 48 hours or more under conditions of 23°C and 50±2% relative humidity. The above total light transmittance is the total light transmittance of one sheet constituting the seal portion. In this embodiment, by keeping the total light transmittance of the sheet forming the seal portion within the above range, it is possible to suppress the visibility of the contents from the seal portion. This makes it possible to obtain packaging with excellent design.

[0042] In this embodiment, the sealing portion may be a side sealing portion or a front sealing portion, but preferably the total light transmittance of one sheet constituting the side sealing portion is within the above range, and more preferably the total light transmittance of one sheet constituting both the side sealing portion and the front sealing portion is within the above range.

[0043] The value obtained by multiplying the parallel light transmittance of one sheet constituting the seal portion by the total light transmittance of one sheet constituting the seal portion (parallel light transmittance × total light transmittance) is preferably 70 or less, more preferably 50 or less, even more preferably 40 or less, and even more preferably 30 or less. Furthermore, the value of parallel light transmittance × total light transmittance is preferably 0.01 or more, more preferably 0.1 or more, even more preferably 10 or more, and even more preferably 20 or more. By keeping the value of parallel light transmittance × total light transmittance within the above range, the amount of parallel light can be efficiently reduced, thereby more effectively decreasing visibility.

[0044] The diffuse light transmittance of the sheet constituting the seal portion of the packaging is preferably 40% or more, more preferably 45% or more, even more preferably 50% or more, and particularly preferably 55% or more. Furthermore, the diffuse light transmittance of the sheet constituting the seal portion of the packaging is preferably 70% or less. Here, the diffuse light transmittance of the packaging material (sheet) is measured using a haze meter HM-150 (manufactured by Murakami Color Technology Research Institute, D65 light source) in accordance with JIS K 7361-1:1999 after humidifying the material for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. The above diffuse light transmittance is the diffuse light transmittance of one sheet constituting the seal portion. In this embodiment, by setting the diffuse light transmittance of the sheet forming the seal portion when the packaging is made to the above range, the proportion of light that passes through the sheet and is diffused can be increased. This can reduce the clarity when viewing the contents and suppress the contents from being clearly visible through the seal portion. As a result, a packaging with excellent design can be obtained.

[0045] In this embodiment, the sealing portion may be a side sealing portion or a front sealing portion, but preferably the diffuse light transmittance of one sheet constituting the side sealing portion is within the above range, and more preferably the diffuse light transmittance of one sheet constituting both the side sealing portion and the front sealing portion is within the above range.

[0046] Methods for achieving the above-mentioned optical properties of the sheet constituting the seal portion of the packaging include, for example, selecting a resin sheet and adding appropriate fillers, colorants, additives, etc., to the resin sheet. Alternatively, the optical properties of the sheet can be controlled by selecting a resin sheet and applying embossing, sandblasting, or scratch processing to it. Furthermore, the optical properties can also be controlled by selecting a resin sheet and laminating it with another resin sheet (e.g., a light-scattering sheet) or by adding a printed layer.

[0047] The glossiness of the sheet constituting the seal portion of the packaging is preferably 70% or less, more preferably 50% or less, and even more preferably 30% or less. Furthermore, the glossiness of the sheet constituting the seal portion of the packaging is preferably 20% or more. Here, the glossiness of the packaging material (sheet) is measured using a digital gloss meter GM-26 PRO / Touch (manufactured by Murakami Color Technology Laboratory) in accordance with Method 3 (60-degree specular gloss) of JIS Z 8741:1997, after humidifying the material for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. The above glossiness refers to the glossiness of a single sheet constituting the seal portion. By keeping the glossiness of the sheet within the above range, the design of the packaging can be enhanced.

[0048] In this embodiment, the sealing portion may be a side sealing portion or a front sealing portion, but preferably the glossiness of one sheet constituting the side sealing portion is within the above range, and more preferably the glossiness of one sheet constituting both the side sealing portion and the front sealing portion is within the above range.

[0049] When the caramel packaging surface of the packaging body is made of a paper-based packaging material, the opacity of the sheet is preferably 80% or less, more preferably 60% or less, and even more preferably 40% or less. Furthermore, the opacity of the sheet constituting the seal portion of the packaging body is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more. Here, the opacity of the packaging material (sheet) is measured using a colorimeter SC-WT (manufactured by Suga Test Instruments Co., Ltd.) in accordance with JIS P 8149:2023 after humidifying the sheet at a temperature of 23°C and a relative humidity of 50±2% for 48 hours or more. The above opacity refers to the opacity of a single sheet constituting the seal portion. By keeping the opacity of the sheet within the above range, it is possible to suppress the visibility of the contents and enhance the design of the packaging body.

[0050] In this embodiment, the sealing portion may be a side sealing portion or a front sealing portion, but preferably the opacity of one sheet constituting the side sealing portion is within the above range, and more preferably the opacity of one sheet constituting both the side sealing portion and the front sealing portion is within the above range.

[0051] The thickness of the sheet constituting the seal portion of the packaging is preferably 22 μm or more, and preferably 74 μm or less. Here, the sheet thickness is 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 is laminated paper, it is preferable that the sum of the thicknesses of each layer is within the above range.

[0052] The basis weight of the sheet constituting the seal portion of the packaging is 17 g / m². 2 Preferably, it is 70 g / m 2 The following is preferable: The basis weight of the sheet is the value measured using a Sartorius Cubis series analytical macro balance MSU524S (manufactured by Sartorius Japan Co., Ltd.) in accordance with JIS P 8124:2011 after the sheet has been conditioned for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. If the sheet is laminated paper, it is preferable that the sum of the basis weights of each layer is within the above range.

[0053] The tensile strength in the longitudinal direction (MD direction: Machine Direction) of the sheet constituting the seal portion of the packaging is preferably 5 N / cm or more and 45 N / cm or less. The tensile strength in the transverse direction (TD direction) of the sheet constituting the seal portion of the packaging is preferably 6 N / cm or more and 30 N / cm or less.

[0054] The tensile strength of the sheet constituting the seal portion of the packaging is the value measured for one sheet that forms the side seal portion when the packaging is assembled, 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 at a temperature of 23°C and a relative humidity of 50±2% for 48 hours or more. 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 in each direction from the sheet that forms the side seal portion when the packaging is assembled. Next, the prepared test specimen was 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 specimen broke. The tensile strength was 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).

[0055] The tear strength in the longitudinal direction (MD direction) of the sheet constituting the seal portion of the packaging is preferably 0.1N or more and 20N or less. The tear strength in the transverse direction (TD direction) of the sheet constituting the seal portion of the packaging is preferably 0.1 N or more and 20 N or less.

[0056] The tear strength of the sheet constituting the seal portion of the packaging is measured using a method compliant with JIS K 8116:2000 for one sheet that forms the side seal portion when the packaging is assembled. 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 48 hours or more. Then, the sheet that forms the side seal portion when the packaging is assembled is cut to a size of 76 mm x 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 a tear test is performed.

[0057] 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. It is preferable that such a printing layer be provided on the entire surface of the resin film, as providing a printing layer on the entire surface effectively prevents the contents from being seen. In conventional soft pack products, the printing layer is not laminated on the front seal portion or side seal portion of the resin film, and in particular, the caramel packaging surface and each seal portion are transparent. This is to avoid hindering sealing performance and to prevent contamination of the equipment and the product contents. However, in this embodiment, it is also preferable to laminate the printing layer on the caramel packaging surface, front seal portion, and side seal portion. In this embodiment, it is preferable that the resin film constituting the caramel packaging surface of the packaging has a printing layer, and the side seal portion of the caramel packaging surface may also have a printing layer. Furthermore, in this embodiment, the front seal portion is provided on the surface perpendicular to the caramel packaging surface (long side surface 13), and the resin film constituting the front seal portion may also have a printing layer. In this embodiment, a configuration in which both the side seal portion and the front seal portion have a printed layer is also a preferred embodiment.

[0058] When a printing layer is provided on each seal portion, it is preferable that the printing layer is provided in such a way that it does not directly come into contact with the product inside or the sealing equipment. This makes it easier to achieve the desired optical properties of the seal portion while suppressing contamination of the equipment and the product inside. As a result, it is possible to suppress the visibility of the contents from the seal portion and enhance the aesthetic appeal of the packaging.

[0059] Furthermore, it is preferable to have a layer configuration such that the printed layer is not exposed. For example, if the sheet used as packaging material is a resin film, the layer configuration may be resin film / printed layer / overcoat layer. The sealing layer is preferably provided on the printed surface of the paper substrate, and other layers such as a coating layer may be provided between the paper substrate and the sealing layer. Since the paper substrate does not melt when heat is applied and does not significantly weaken the adhesion of the ink, the ink is less likely to transfer to the equipment even if printing is applied to the surface. By providing a coating layer such as a transparent varnish on top of the printed surface, it is possible to further prevent the ink from transferring to the equipment. If the sheet used as packaging material is laminated paper with a paper substrate, the printing may be applied to the outside of the paper substrate, and lamination may be applied on top of the printing. Having a laminate layer on top of the printing prevents the ink from transferring to the equipment.

[0060] Furthermore, when printing on the front seal portion of a resin film, the printing can be applied to the inner surface of the sheets when they are overlapped at the seal portion, and in this case, it is not necessary to provide an overcoat layer on top of the print. Also, when using a film material with a relatively high parallel light transmittance of over 60%, sufficient reduction in visibility can be obtained in the side seal portion due to the irregularities formed during sealing, but in the front seal portion, the reduction in visibility may be insufficient because the sealing surface is relatively flat. However, even in this case, the effect can be obtained without incurring additional costs by applying printing that does not require an overcoat.

[0061] In manufacturing the packaging 1 of this embodiment, a laminate 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 packaging. In this embodiment, heat sealing is preferable when sealing the packaging material. This type of packaging is called caramel packaging. Caramel packaging can be performed using known equipment.

[0062] In the packaging 1 of this embodiment, it is preferable that the width direction of the laminate of sanitary tissue paper coincides with the MD direction of the packaging 1, and that the depth direction of the laminate of sanitary tissue paper coincides with the CD direction of the packaging material 1. Furthermore, it is preferable that the tear strength of the packaging material is greater in the depth direction of the laminate of sanitary tissue paper than in the width direction. That is, it is preferable that the packaging material is easily torn along the width direction of the laminate of sanitary tissue paper. More specifically, it is preferable that the tear strength in the depth direction is greater than the tear strength in the width direction, more preferably three times or more than the tear strength in the width direction, and even more preferably five times or more than the tear strength in the width direction. By setting the tensile strength of the packaging material to the above conditions and forming perforations for opening along the width direction of the laminate of sanitary tissue paper in the packaging, the perforations can be easily opened. Furthermore, it is preferable that the tensile elongation of the packaging material is greater in the depth direction of the laminated sanitary tissue paper than in the width direction. In other words, the packaging material is more likely to stretch along the depth direction of the laminated sanitary tissue paper. When wrapping the laminated sanitary tissue paper with the packaging material, the packaging material stretches easily in the direction of compression of the laminated sanitary tissue paper, which allows the laminated sanitary tissue paper to fit more easily into the packaging material when sealed and formed into a package. [Examples]

[0063] 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.

[0064] [Preparation of packaging materials and packaging bodies] (Example 1) The base material for the sheet has a basis weight of 37.4 g / m². 2A PE film 2 (a mixed resin film of LDPE (low density polyethylene) and LLDPE (linear low density polyethylene) containing 6 mass% of talc as a filler) was used. First, printing was performed on one surface of the base material at a location other than the portions that would become the front seal portion and the side seal portion when formed into a package. Subsequently, a cut line for cracking was formed on the portion that would become the top surface when formed into a package, thereby producing a packaging material. The physical properties and optical properties of the packaging material were measured by the methods described later and are shown in Tables 2 and 3. [[ID=> [[ID=>

[0065] [[ID=> With the printed surface of the produced packaging material facing inward, 200 sets of tissue laminates were sealed by caramel packaging to produce the package shown in FIG. 1. The compression rate of the package was calculated by the method described later and is shown in Table 1. Note that the package was produced such that the direction in which the cut line for cracking extends (i.e., the longitudinal direction of the package) is the MD direction of the base material. [[ID=> [[ID=>

[0066] [[ID=> (Example 2) [[ID=> A packaging material and a package were produced in the same manner as in Example 1, except that a PE film 2 having a basis weight of 58.0 g / m[[ID=> 2 was used as the base material of the sheet. [[ID=> [[ID=>

[0067] [[ID=> (Example 3) [[ID=> A packaging material and a package were produced in the same manner as in Example 1, except that a PE film 2 having a basis weight of 37.6 g / m[[ID=> 2 and a talc content of 8 mass% was used as the base material of the sheet. [[ID=> [[ID=>

[0068] [[ID=> (Example 4) [[ID=> A PE film 1 (a mixed resin film of LDPE and LLDPE) having a basis weight of 20.0 g / m[[ID=> 2 was used as the base material of the sheet. First, printing was performed on one surface of the base material, and extrusion lamination was performed over the entire printed surface such that the polyethylene resin had a basis weight of 13.7 g / m[[ID=> 2 Subsequently, a cut line for cracking was formed on the portion that would become the top surface when formed into a package, thereby producing a packaging material. [[ID=> [[ID=>

[0069] [[ID=> A tissue laminate (150 pairs) was sealed using caramel packaging so that the printed side (laminated side) of the prepared packaging material faced inward, and a package was prepared in the same manner as in Example 1.

[0070] (Example 5) The base material for the sheet has a basis weight of 30.0 g / m². 2 Glassine paper was used. First, printing was done on one side of the base material, excluding the front seal and side seal areas when it is made into a package. Then, polyethylene resin was applied to the entire printed side at a basis weight of 13.7 g / m². 2 Extrusion lamination was performed to achieve the desired result. Next, a tear-off line was formed on the top surface of the package to create the packaging material.

[0071] A tissue laminate (200 pairs) was sealed using caramel packaging so that the printed side (laminated side) of the prepared packaging material faced outwards, and a package was prepared in the same manner as in Example 1.

[0072] (Example 6) The base material for the sheet has a basis weight of 30.0 g / m². 2 Except for using Graphene paper, the packaging material and packaging body were prepared in the same manner as in Example 6.

[0073] (Example 7) The base material for the sheet has a basis weight of 30.0 g / m². 2 A glossy paper with a single-sided surface was used. Printing was performed on one side of the base material, excluding the front seal and side seal areas when the packaging is assembled. Then, a heat sealant (a heat sealant mainly composed of ethylene-vinyl acetate resin) was applied to a portion of the printed side (the area where the base material overlaps when the packaging material is folded into a package) at a basis weight of 8.0 g / m². 2 The material was coated in this manner. Next, a tear-off line was formed on the top surface of the package to create the packaging material.

[0074] A tissue laminate (200 pairs) was sealed using caramel packaging so that the printed side of the prepared packaging material faced outwards, and a package was prepared in the same manner as in Example 1.

[0075] (Comparative Example 1) The base material for the sheet has a basis weight of 25.5 g / m². 2 Except for using PE film 1, the packaging material and packaging body were prepared in the same manner as in Example 1.

[0076] [Measurement of packaging] <Compression ratio> The compression ratio of the packaging for each example and comparative example was determined by the following formula (I). Packaging compression ratio = Packaging circumference / Theoretical circumference calculated from the outer dimensions of the tissue layer (I) Here, the perimeter of the packaging was calculated as (packaging height + packaging depth) × 2, and the theoretical perimeter calculated from the outer dimensions of the tissue stack was calculated as (tissue thickness (per set) × 2 × number of sets + depth of tissue stack) × 2.

[0077] The height and depth of the packaging were measured using the following methods. 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 calculated. Measurements were taken for 10 packaging items, and the average value was defined as the "packaging height." For the packaging depth, the length in the short direction of the top surface was measured at three points: both ends of the longitudinal direction of the top surface and the center, using a stainless steel ruler, and the average value was calculated. Measurements were taken for 10 packaging items, and the average value was defined as the "packaging depth."

[0078] The tissue thickness and the depth of the tissue stack were measured using the following methods. For the tissue thickness, the tissue stack removed from the packaging was humidified according to JIS P 8111:1998, and then the thickness of each tissue was measured according to ISO 12625-3. Measurements were taken for 10 sets of tissue, and the average value was defined as the "tissue thickness." For the depth of the tissue stack, the length in the short direction was measured at three points: both ends in the long direction and the center, when viewed from above, and the average value was calculated. Measurements were taken for 10 tissue stacks, and the average value was defined as the "depth of the tissue stack."

[0079] [Table 1]

[0080] [Measurement of packaging materials] <Basic weight> First, the packaging materials for each example and comparative example were conditioned for at least 48 hours at a temperature of 23°C and a relative humidity of 50±2%. Subsequently, the basis weight of the packaging materials for each example and comparative example was measured using a Sartorius Cubis series analytical macro balance MSU524S (manufactured by Sartorius Japan Co., Ltd.) in accordance with JIS P 8124:2011. The measured values ​​are shown in Table 2.

[0081] <thickness> First, the packaging materials for each example and comparative example were conditioned for at least 48 hours at a temperature of 23°C and a relative humidity of 50±2%. Next, for each example and comparative example, the thickness was measured at 30 randomly selected locations on the sheet (1 sheet) that would form the side seal portion when assembled into a package, using a thickness gauge L&W 251 (manufactured by L&W) in accordance with JIS P 8118:2014. Table 2 shows the average values ​​of the 30 measured locations.

[0082] <Tensile strength> For the packaging materials, the tensile strength of the sheet (1 sheet) that forms the side seal portion when assembled into a package was measured using a method compliant with JIS K 7127:1999. Specifically, first, the packaging materials of each example and comparative example were conditioned for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. Next, using a dumbbell-shaped test specimen type 5 (width of the narrow parallel section 6.0 mm) as described in JIS K 7127:1999, test specimens were punched out from the sheet that forms the side seal portion when assembled into a package for each example and comparative example. This produced two types of test specimens, in which the longitudinal direction of the test specimen was the vertical direction of the sheet (MD: Machine Direction) and the transverse direction perpendicular to the vertical direction (TD: Transverse Direction).

[0083] The prepared test specimens were 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 specimen broke. The tensile strength was defined as the value (in MPa) 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). Two types of test specimens for each example and comparative example were measured four times each. Table 2 shows the average value of the four measurements.

[0084] <Tensile elongation> For the packaging material, the tensile elongation of a sheet (1 piece) that forms the side seal portion when assembled into a package was measured using a method compliant with JIS K 7127:1999. Specifically, a test specimen was prepared using the same method as the tensile strength measurement described above, and the specimen was pulled under the same conditions until it broke. The tensile elongation was defined as the increase in the distance between gauge marks at the fracture point (i.e., the elongation until fracture) divided by the distance between gauge marks (25 mm) (unit: %).

[0085] <Tear strength> For the packaging materials, the tear strength of the sheet (1 sheet) that forms the side seal portion when assembled into a package was measured using a method compliant with JIS K 8116:2000. Specifically, first, the packaging materials of each example and comparative example were conditioned for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. Next, for the packaging materials of each example and comparative example, the sheet that forms the side seal portion when assembled into a package was cut to a size of 76 mm × 63 mm to prepare two types of test pieces (vertical and horizontal). The prepared test pieces were mounted on an Elmendorf type tear tester SA-W (manufactured by Toyo Seiki Co., Ltd.), a 20 mm cut was made, and the test was performed. Measurements were taken five times for each of the two types of test pieces of each example and comparative example, and Table 2 shows the average value of the five measurements. If the reading of the test result was small, multiple test pieces were stacked and measured, and the value obtained by dividing the measurement by the number of pieces was taken as the tear strength.

[0086] <Total light transmittance, diffuse light transmittance, and parallel light transmittance> For the packaging materials, the total light transmittance, diffuse light transmittance, and parallel light transmittance were measured for one sheet that forms the side seal portion when assembled into a package, in accordance with JIS K 7361-1:1999. Specifically, first, the packaging materials of each example and comparative example were conditioned for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. Next, five test specimens were prepared by cutting the sheet that forms the side seal portion when assembled into a package from the packaging materials of each example and comparative example to a size of 50 mm × 50 mm. Subsequently, the total light transmittance, diffuse light transmittance, and parallel light transmittance were measured for the five prepared test specimens using a haze meter HM-150 (manufactured by Murakami Color Technology Laboratory, D65 light source), in accordance with JIS K 7361-1:1999. Table 3 shows the average values ​​of the measurements for the five test specimens. Furthermore, during measurement, we confirmed that the test specimen was fixed in the specimen holder in a uniformly stretched state.

[0087] <Haze level> For the packaging materials, the haze of one sheet that forms the side seal portion when assembled into a package was measured according to the method conforming to JIS K 7136:2000. Specifically, first, the packaging materials of each example and comparative example were conditioned for 48 hours or more at a temperature of 23°C and a relative humidity of 50±2%. Next, similar to the measurement of total light transmittance, five test specimens were prepared by cutting the sheet that forms the side seal portion when assembled into a package from the packaging materials of each example and comparative example to a size of 50 mm x 50 mm. Subsequently, the haze of the five prepared test specimens was measured using a haze meter HM-150 (manufactured by Murakami Color Technology Laboratory, D65 light source) according to the method conforming to JIS K 7136. Table 3 shows the average values ​​of the measurements of the five test specimens. When measuring, it was confirmed that the test specimens were fixed in the test specimen holder in a uniformly stretched state.

[0088] <Glossiness> The packaging materials of Examples 1-4 and the Comparative Example were conditioned for at least 48 hours at a temperature of 23°C and a relative humidity of 50±2%. Subsequently, the gloss of the packaging materials of Examples 1-4 and the Comparative Example was measured at 10 randomly selected locations on the outer surface of one sheet, which forms the side seal portion when assembled into a package, using a digital gloss meter GM-26 PRO / Touch (manufactured by Murakami Color Technology Laboratory) in accordance with Method 3 (60-degree specular gloss) of JIS Z 8741:1997. Table 3 shows the average values ​​of the 10 measurements. Before measurement, it was confirmed that the packaging material was fixed to the sample stage in a uniformly stretched state.

[0089] <Opacity> The packaging materials of Examples 5-7 were conditioned for 48 hours or more under conditions of a temperature of 23°C and a relative humidity of 50±2%. Next, the opacity of the packaging materials of Examples 5-7 was measured at 10 randomly selected locations on the sheet (1 sheet) that would form the side seal portion when assembled into a package, using a colorimeter SC-WT (manufactured by Suga Test Instruments Co., Ltd.) in accordance with JIS P 8149:2023. Table 3 shows the average values ​​of the 10 measured locations. Before measurement, it was confirmed that the packaging material was fixed to the sample stage in a uniformly stretched state.

[0090] <Evaluation of Visibility> The front seal and side seal portions of the packaging for each example and comparative example were visually inspected and evaluated on a four-point scale according to the following criteria. The evaluation results are shown in Table 3. ◎: The tissues inside are completely invisible. ○: The tissue inside is faintly visible. △: The tissue inside appears slightly blurred. ×: The tissues inside are clearly visible.

[0091] [Table 2]

[0092] [Table 3] [Explanation of symbols]

[0093] 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 body in which the parallel light transmittance of the sheet constituting the sealing portion of the packaging body is 60% or less.

2. The packaging according to claim 1, wherein the degree of cloudiness of the sheet constituting the seal portion in the packaging is 35% or more.

3. The packaging according to claim 1, wherein the total light transmittance of the sheet constituting the seal portion of the packaging is 90% or less.

4. The packaging body according to claim 1, wherein the sheet constituting the packaging body is a resin film.

5. The packaging according to claim 4, wherein the resin film includes a filler.

6. The packaging according to claim 4, wherein the resin film constituting the seal portion of the packaging has a printed layer.

7. The packaging according to claim 6, wherein the packaging has a side seal portion on the caramel packaging surface, and the resin film constituting the side seal portion has a printed layer.

8. The packaging according to claim 6, wherein the packaging has a front seal portion on a surface perpendicular to the caramel packaging surface, and the resin film constituting the front seal portion has a printed layer.

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