Package

Abstract

To provide a package in which an object to be packaged is packaged with a packaging base material mainly composed of a paper base material, which is hardly torn from a portion to which a corner portion of the object to be packaged abuts, and which has good sealability of the package.SOLUTION: A sanitary paper carton package in which a plurality of sanitary paper cartons are packaged with a packaging base material, where the packaging base material has a layer configuration including a paper base material and a seal layer for sealing the package, a basis weight of the packaging base material is 30 g / m2 or more and 80 g / m2 or less, and a geometric mean breaking elongation of a breaking elongation of the packaging base material in a height direction of the package and a breaking elongation of the packaging base material in a widthwise direction of the package perpendicular to the height direction of the package is 3.0% or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a package in which a carton containing sanitary paper is packaged with a packaging base material. [Background technology]

[0002] In recent years, the problem of plastic waste has become more serious worldwide, and there is a desire to replace plastic packaging materials with other materials in order to improve the global environment. In the field of packaging for paper products, a package has been proposed in which the packaging material is replaced from plastic film to a paper-based material, and paper products are wrapped in wrapping paper (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-70501 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a packaged item with corners, such as a tissue carton (also called a tissue box), is wrapped in a packaging base material, force is concentrated at the point where the corners come into contact, and the packaging base material tends to tear at the point where the corners come into contact.

[0005] When packaging an item having corners with a packaging substrate primarily made of paper, increasing the basis weight of the packaging substrate to prevent tearing can result in insufficient heat transfer during the heat sealing process for joining the packaging substrate to seal the package, making it impossible to obtain good bonding strength, and the sealability of the package can be poor.

[0006] Therefore, the present invention aims to provide a package in which a packaged item having corners is wrapped in a packaging base material mainly made of paper, which is less likely to tear at the part where the corners of the packaged item come into contact and has good sealing properties. [Means for solving the problem]

[0007] As a result of intensive research to solve the above problems, the present inventors have discovered a sanitary paper carton package in which a plurality of sanitary paper cartons are packaged in a packaging base material, the packaging base material having a layer structure including a paper base material and a seal layer for sealing the package, and the basis weight of the packaging base material is 30 g / m 2 More than 90g / m 2 The inventors have found that the above-mentioned problems can be solved by a sanitary paper carton packaging body in which the geometric mean breaking elongation of the packaging base material in the height direction of the packaging body and the breaking elongation of the packaging base material in the width direction of the packaging body perpendicular to the height direction of the packaging body is 2.5% or more.

[0008] Specifically, the present invention has the following configuration. [1] A sanitary paper carton package in which multiple sanitary paper cartons are packaged with a packaging base material, The packaging substrate has a layer structure including a paper substrate and a seal layer for sealing the package, The basis weight of the packaging substrate is 30 g / m 2 End 80 g / m 2 is as follows: The geometric mean breaking elongation of the packaging substrate in the height direction of the package and the breaking elongation of the packaging substrate in the width direction of the package perpendicular to the height direction of the package is 3.0 % or more. [2] The sanitary paper carton packaging described in [1], characterized in that the tensile strength of the packaging base material in the height direction of the packaging body is 1.0 kN / m or more. [3] The sanitary paper carton packaging described in [1] or [2], characterized in that the tensile strength of the packaging base material in the width direction of the packaging body is 2.0 kN / m or more. [4] A sanitary paper carton package according to any one of [1] to [3], characterized in that the transparency of the packaging base material is 60% or more. [5] A sanitary paper carton packaging body according to any one of [1] to [4], characterized in that the paper base material is glassine paper. [6] A sanitary paper carton package according to any one of [1] to [5], characterized in that the packaging format of the package is a caramel packaging format. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a package in which a packaged item having corners is wrapped in a packaging base material mainly made of paper, which is less likely to tear at the part where the corners of the packaged item come into contact and has good sealing properties. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a package according to an embodiment of the present invention; [Figure 2] 1 is a diagram showing one embodiment of a packaging substrate according to an embodiment of the present invention. [Figure 3] 1A and 1B are diagrams showing another aspect of a packaging substrate according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments and drawings are provided for illustrative purposes and are not intended to limit the present invention.

[0012] First Embodiment [Packaging] 1 is a schematic perspective view of a packaging body according to a first embodiment of the present invention. In the first embodiment of the present invention, the packaging body 1 includes a plurality of sanitary paper cartons 2, a packaging base 10 that collectively packages the plurality of sanitary paper cartons 2, and a handle 20.

[0013] [Hygienic paper carton] In this specification, a sanitary paper carton 2 refers to a sanitary paper product (also referred to as a "boxed laminated sanitary paper product") that has a box-like shape with corners, and is made up of a laminate of multiple sheets or multiple sets of sanitary paper sheets such as tissue paper, kitchen paper, hand towels, wipers, etc. Examples of sanitary paper cartons 2 include tissue cartons (also referred to as tissue boxes), kitchen paper cartons, hand towel cartons, and wiper cartons.

[0014] The sanitary paper carton 2 generally has a rectangular shape surrounded by only rectangular faces or by rectangular and square faces, but the sanitary paper carton 2 applicable to the embodiments of the present invention is not limited to this as long as it has corners, and may, for example, have a cubic shape surrounded by only square faces, or may have a three-dimensional shape with any polygonal faces.

[0015] The number (quantity) of sanitary paper cartons 2 contained in the package 1 may be determined based on the ease of handling of the package 1, product sales strategies, etc., which depend on the dimensions and weight of the sanitary paper cartons 2 and the strength (ease of tearing) of the packaging base material 10. The number of sanitary paper cartons 2 contained in the package 1 is preferably two or more, and more preferably two to five.

[0016] The sanitary paper carton 2 shown in Fig. 1 is a rectangular parallelepiped tissue carton that contains tissue paper (not shown) as sanitary paper sheets. Five sanitary paper cartons 2 are contained in the package 1. In this example, the five sanitary paper cartons 2 have the same dimensions and shape, but in embodiments of the present invention, the dimensions and shapes of the multiple sanitary paper cartons 2 contained in the package 1 may be the same or different. For example, multiple rectangular parallelepiped sanitary paper cartons 2 with the same bottom dimensions and different heights may be stacked with their bottoms and tops facing each other and contained in the package 1.

[0017] [Hygienic paper sheets] The sanitary paper sheets contained in the sanitary paper carton 2 may be a single-ply product consisting of a single sheet, or a multi-ply product consisting of a set of two or more sheets. The multiple sheets or sets of sanitary paper sheets contained in the sanitary paper carton 2 are preferably stacked alternately in a pop-up style so that when the sanitary paper sheets are used, they are pulled out one sheet at a time or one set at a time from the opening of the sanitary paper carton.

[0018] There is no limit to the number of sanitary paper sheets housed in one sanitary paper carton 2, and it may be, for example, 20 to 400 sheets (or 10 to 200 sets).

[0019] Depending on the required quality, the sanitary paper sheets may be embossed to give them a textured surface, or may be printed with graphics or letters to add information such as patterns, logos, or messages.

[0020] Sanitary paper sheets are obtained by papermaking a slurry containing a pulp component, which is a fiber raw material. Examples of pulp components include wood pulp, non-wood pulp, and recycled paper pulp. Various chemicals, such as paper strength agents and antifoaming agents, may be added as optional components to achieve the required quality and stabilize operations. Any known papermaking machine can be used for papermaking. During the papermaking process, the sanitary paper sheets may be subjected to creping or other processes. During the papermaking process or any subsequent process, calendaring may be performed.

[0021] [Packaging base material] The packaging substrate 10 according to the embodiment of the present invention includes a paper substrate 100 and a seal layer 110 for sealing the package.

[0022] Figures 2 and 3 are diagrams each showing a non-limiting example of one possible embodiment of the packaging substrate 10 constituting the packaging body 1 shown in Figure 1. In the example shown in Figure 1, the packaging body 1 uses the so-called caramel packaging format, which is known for individual packaging of soft candies such as caramel and for packaging cigarette packets.

[0023] Fig. 2(a) is a schematic development view of the packaging substrate 10, and a plan view of the packaging substrate 10 as seen from the surface (hereinafter also referred to as "front surface") that will be the outer surface of the package 1. Fig. 2(b) is a schematic cross-sectional view taken along line IIb-IIb of the packaging substrate 10 shown in Fig. 2(a), and Fig. 2(c) is a schematic cross-sectional view taken along line IIc-IIc of the packaging substrate 10 shown in Fig. 2(a).

[0024] 2(a), the packaging substrate 10 of this example is rectangular OPQR. A sealant for sealing the packaging body 1 is applied to the hatched area in the drawing.

[0025] 2(b) and 2(c), the sealing agent applied to the paper substrate 100 forms a sealing layer 110, and the packaging substrate 10 has a layer structure including the paper substrate 100 and the sealing layer 110. In this example, the sealing layer 110 entirely covers one side of the paper substrate 100. In the drawings, the thickness and dimensions of each layer are shown schematically and are not drawn to scale.

[0026] FIG. 3 is a diagram showing an example of a possible embodiment of the packaging substrate 10 constituting the packaging body 1 shown in FIG. 1, which is different from the embodiment shown in FIG.

[0027] (a) to (c) of Figure 3 correspond to (a) to (c) of Figure 2, respectively. That is, (a) of Figure 3 is a schematic development view of the packaging substrate 10 and a plan view of the packaging substrate 10 as seen from the surface (surface) that will be the outer surface of the package 1. (b) of Figure 3 is a schematic cross-sectional view of the packaging substrate 10 shown in (a) of Figure 3 taken along line IIIb-IIIb, and (c) of Figure 3 is a schematic cross-sectional view of the packaging substrate 10 shown in (a) of Figure 3 taken along line IIIc-IIIc.

[0028] Fig. 3 differs from Fig. 2 in the region where the sealing layer 110 is provided on the packaging substrate 10. In the embodiment shown in Fig. 3, the sealing layer 110 is provided in the region of the side edge of the packaging substrate 10 indicated by the hatched rectangle OPP1O1, the region of the upper edge of the packaging substrate 10 indicated by the rectangle OO2R2R, and the region of the lower edge of the packaging substrate 10 indicated by the rectangle PP2Q2Q. In addition, the sealing layer 110 is not provided in the region indicated by the rectangle O3P3Q2R2 in the figure.

[0029] 3(b) and 3(c), the packaging substrate 10 has a layer structure including a paper substrate 100 and a sealing layer 110, and the sealing layer 110 partially covers one side of the paper substrate 100. In the drawings, the thickness and dimensions of each layer are shown schematically and are not drawn to scale.

[0030] 2 and 3, in comparison with the packaging body 1 in Fig. 1, the portions of the region indicated by the rectangle OPP1O1 and the portions of the region indicated by the rectangle RQQ1R1 (side edges) (regions indicated by reference numeral 12S in the figures) in the packaging substrate 10 are overlapped and joined via a seal layer 110 provided in the region indicated by the rectangle OPP1O1. Furthermore, the portions of the regions indicated by the rectangles OO2R2R and PP2Q2Q (top and bottom edges) (regions indicated by reference numerals 12T and 12B in the figures) are folded and joined via a seal layer 110 provided in the regions indicated by the rectangles OO2R2R and PP2Q2Q. Therefore, the side edges and top and bottom edges of the packaging substrate 10 described above are the portions that substantially contribute to sealing the packaging body 1.

[0031] Hereinafter, in this specification, the ends (side ends and upper and lower ends) of the packaging substrate 10 that substantially contribute to the sealing of the packaging body 1 as described above will be referred to as the "sealed portion of the packaging body" or the "jointed portion of the packaging substrate" and represented by the symbol 12 (12S, 12T, 12B), and the other portions will be referred to as the "non-sealed portion of the packaging body" or the "non-jointed portion of the packaging substrate" and represented by the symbol N12.

[0032] In the packaging substrate 10 according to an embodiment of the present invention, the area in which the sealing layer 110 is formed is not limited to the examples shown in Figures 2 and 3, and may be formed in any area on the paper substrate 100 as long as it includes the sealing portion 12 of the packaging body.

[0033] [Paper base material] In the embodiment of the present invention, various paper substrates can be used as the paper substrate 100 of the packaging substrate 10 of the packaging body 1.

[0034] The paper base material 100 can be produced by using a pulp component such as wood pulp, non-wood pulp, or recycled paper pulp such as deinked pulp as a main raw material and making paper using a paper machine by a known method.

[0035] Pulp components may be used alone or in combination of two or more types. These pulp components have a significant effect on the quality of the paper base material, so they are appropriately blended in the specified types and proportions to meet the required quality.

[0036] For example, softwood kraft pulp (NKP) and / or hardwood kraft pulp (LKP) may be used in a blending ratio (mass %) of preferably 0-60:100-40, more preferably 20-60:80-40, and even more preferably 40-60:60-40.

[0037] Softwood kraft pulp generally has longer fibers than hardwood kraft pulp. Therefore, the higher the content of softwood kraft pulp in the pulp raw material, the stronger the paper strength of the resulting paper base material 100. For example, the tensile strength in the MD direction (also called the papermaking direction or the machine direction (T direction)) increases, resulting in a paper base material 100 that is less likely to tear even when force is applied in the MD direction.

[0038] The paper substrate 100 applicable to the packaging substrate 10 of the packaging body 1 may be determined based on factors such as processing suitability (ease of bending, rigidity, printability) when manufacturing the packaging body 1, strength (ease of tearing) and appearance (transparency, whiteness) when made into the packaging body 1, and repackaging ability of the packaging body 1 after opening the packaging body 1.

[0039] To achieve the required quality and stabilize production operations, various commonly used chemicals may be added as optional components to the paper base material 100. Examples of optional components include dry strength agents, wet strength agents, sizing agents, bulking agents, dyes, fragrances, dispersants, drainage aids, pitch control agents, and retention aids.

[0040] Specific examples of the paper substrate 100 that can be suitably applied to the embodiment of the present invention include, but are not limited to, transparent paper such as glassine paper and one-sided glossy paper such as pure white paper.

[0041] [Glassine paper] Glassine paper is a transparent tissue paper made by passing base paper made from highly beaten chemical pulp through a calender to apply heat and pressure to eliminate the gaps between the fibers. Glassine paper has properties such as high smoothness, gloss, high density, high air permeability (i.e., it takes a long time for a certain amount of air to pass through a certain area of ​​the paper under a certain pressure; in other words, it has low air permeability), and translucency.

[0042] Generally, "transparent" means being able to see through to the other side of an object or what is inside, while "semi-transparent" means having a low degree of transparency, being somewhere between transparent and opaque, or being able to see the color, light, and shade of an object while not being able to see the shape of the object on the other side clearly. "Opaque" means being unable to see through something to the other side. In this specification, "transparent" and "semi-transparent" are collectively referred to as simply "transparent."

[0043] "Transparency" refers to the rate at which light passes through paper, expressed as a percentage of the amount of incident light. The higher the transparency value, the more clearly you can see through it to the other side or inside.

[0044] In one preferred embodiment of the present invention, in the example of Figure 1, glassine paper is used for the paper substrate 100 of the packaging substrate 10, and the sanitary paper carton 2 (five tissue cartons), which is the object to be packaged in the package 1, can be seen through the packaging substrate 10.

[0045] From the viewpoint of visibility of the packaged items, sanitary paper cartons 2, from the outside of the package 1, in one preferred embodiment of the present invention, the transparency of the packaging substrate 10 is 60% or more, preferably 70% or more, and more preferably 75% or more. When the transparency of the packaging substrate 10 is 60% or more, it is easy to check the state of the packaged items 2 contained in the package 1 (for example, the type, quantity, color, pattern, and shape of the packaged items 2).

[0046] One way to achieve such transparency in the packaging substrate 10 is to employ a highly transparent paper substrate 100. In one preferred embodiment of the present invention, the transparency of the paper substrate 100 is 60% or more, preferably 70% or more, and more preferably 75% or more. Examples of highly transparent paper that can be used for the paper substrate 100 include, but are not limited to, glassine paper and parchment paper.

[0047] The transparency of the paper substrate 100 and the packaging substrate 10 can be measured in accordance with ISO 5-2 using a diffuse light transmittance meter DOT-5 (manufactured by Murakami Color Research Laboratory Co., Ltd.) The transparency of the packaging substrate 10 is measured in the region of the non-jointed portion N12 of the packaging substrate 10 (the non-sealed portion of the package 1).

[0048] [Effects of the embodiment using glassine paper] In this embodiment, by using glassine paper as the paper base material 100 of the packaging base material 10, the following effects can be achieved, for example. (1) Because glassine paper is transparent, the sanitary paper cartons 2 contained in the package 1 can be easily seen through the transparent glassine paper 100 (and the transparent sealing layer 110 provided thereon, if present) in the non-sealed portion N12 of the package 1 (internal visibility is possible). For example, the type, quantity, color, pattern, shape, etc. of the sanitary paper cartons 2 can be confirmed from the outside of the package 1 (see Figure 1). (2) Because glassine paper has high air permeability, the sanitary paper carton 2, which is the packaged item packaged in the packaging base material 10, is less susceptible to the effects of external moisture, odors, and the like.

[0049] [Parchment paper] "Parchment paper" is a transparent paper in which some of the cellulose fibers in the base paper have been converted into amorphous amyloids, and can be obtained by treating base paper, which is primarily composed of cellulose fibers, with an acid such as sulfuric acid, hydrochloric acid, formic acid, or acetic acid. For example, parchment paper can be produced by a series of processes: immersing the base paper in sulfuric acid, neutralizing and / or washing with water repeatedly, and then drying. The immersion time cannot be generally limited, but can be adjusted appropriately taking into account the thickness, density, sizing degree, washing ability, drying ability, etc. of the base paper.

[0050] When base paper, which is made up of cellulose pulp fibers, is immersed in sulfuric acid, the cellulose swells, hydrolyzes, and dissolves. The dissolved cellulose becomes a viscous, translucent, gelatinous substance that coats the surface of the base paper, firmly binds the fibers together, and fills the pores and gaps in the paper layers, forming an extremely dense paper layer structure. As a result, diffuse reflection of light within the paper layers is reduced, promoting transparency.

[0051] The gelatinous substance produced by the hydrolysis of cellulose is neutralized and / or washed with water to stop the hydrolysis reaction and become hydrated cellulose. Therefore, the pores in the paper are blocked by cellulose, which is chemically the same as the base paper, improving transparency and reducing minute white spots that are thought to be caused by the formation or pores in the base paper layer, resulting in base paper with a uniform transparency.

[0052] It is also possible to produce paper with higher transparency by incorporating fine fibrous cellulose with an average fiber width of 2 to 50 nm, which can be obtained by chemically treating or defibrating lignocellulosic raw materials into the pulp used.

[0053] [Effects of the embodiment using parchment paper] Using parchment paper as the paper substrate 100 of the packaging substrate 10 can provide an internal visibility effect, similar to the use of glassine paper. That is, in terms of the exterior of the packaging body 1, the sanitary paper cartons 2 packaged in the packaging body 1 can be easily seen through the transparent parchment paper 100 in the unsealed portion of the packaging body 1 (and the transparent seal layer 110 provided thereon, if present). For example, the type, quantity, color, pattern, shape, etc. of the sanitary paper cartons 2 can be confirmed from the outside of the packaging body 1 (see FIG. 1).

[0054] [One-glazed paper] In one aspect of this embodiment, the paper substrate 100 may be one-sided glossy paper. One-sided glossy paper is paper with one side that is made glossy by increasing the smoothness of the other side, and has a glossy side (high smoothness side) that is relatively smooth and feels slippery to the touch, and a non-glossy side (low smoothness side) that is relatively less smooth and feels rough to the touch.

[0055] One-sided glazed paper can be produced by making paper from pulp raw materials in a papermaking machine equipped with a mirror-finished Yankee dryer, and then pressing a wet paper web against the mirror-finished surface of the Yankee dryer to dry it. The smoothness and gloss of the surface that comes into contact with the Yankee dryer are higher than those of the surface that does not come into contact with the Yankee dryer, and in this way a paper base material (one-sided glazed paper) 100 having a glossy side and a non-glossy side can be produced.

[0056] For example, glassine paper is made by passing base paper made from highly beaten chemical pulp through a calender to apply heat and pressure to eliminate the gaps between the fibers, resulting in high density and smoothness, while single-sided glazed paper is made by pressing a wet paper onto the surface of a mirror-finished Yankee dryer and drying it, thereby improving the smoothness of the surface that comes into contact with the Yankee dryer.Since single-sided glazed paper is not calendered or the calendering conditions are mild, the inter-fiber bonds of the pulp fibers contained in the base paper are relatively hard to break, so it is possible to obtain paper of the same strength as glassine paper at a relatively low cost.

[0057] [Pure blank paper] In one aspect of the embodiment of the present invention, the paper substrate 100 may be pure white paper. Pure white paper is a type of the single-sided gloss paper described above, and is produced using pulp with high whiteness, such as bleached pulp, and has high whiteness.

[0058] [Whiteness] The whiteness of pure white paper is, for example, 80% or more, and for example, 90% or more. The whiteness can be measured in accordance with JIS P8148:2005 (ISO2470).

[0059] [Effects of using pure white paper] In the case of using pure white paper for the paper base material 100, in addition to the effects described above in the section on one-sided glossy paper, its high whiteness results in a high-quality appearance, and when printing is applied to the packaging base material 10, the background of the print becomes white, which has the effect of improving the visibility of the print.

[0060] [Sealing layer] The sealing layer 110 is a layer containing a sealing agent.

[0061] [Sealant] As a sealing agent applicable to the embodiment of the present invention, any sealing agent known in the art that can bond the packaging substrate 10 and seal the package 1 can be used. As the sealing agent, any material that exhibits heat sealing properties, i.e., a heat sealing agent, or any material that exhibits adhesive properties other than a heat sealing agent, i.e., an adhesive, can be used.

[0062] Examples of heat-sealing agents that can be used include polyolefin resins and other thermoplastic resins, with polyethylene resins being preferred. Examples of such materials include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-ethyl acrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-methacrylic acid copolymers, ionomers, amorphous polyesters, polypropylene, styrene-acrylic copolymers, propylene-ethylene copolymers (preferably copolymers with an ethylene content of 10 mol% or less), polypropylene resins obtained by graft-polymerizing or copolymerizing polypropylene with unsaturated carboxylic acids, unsaturated carboxylic anhydrides, ester monomers, and the like, medium-density polyethylene, and high-density polyethylene. These materials may be used alone or in combination of two or more.

[0063] Examples of adhesives include water-soluble polymers such as methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, polyvinylpyrrolidone, polyvinyl alcohol, and the like, as well as derivatives and mixtures thereof.

[0064] [Method for forming the sealing layer] The sealing layer 110 can be formed by using, for example, a commonly used method such as the following. (1) A method of forming a film on a paper substrate 100 by extrusion of a thermoplastic resin such as a polyolefin resin or a composition containing a thermoplastic resin. (2) A method of laminating a film made of a thermoplastic resin or a film containing a thermoplastic resin to the paper substrate 100 using a known heat sealing processing device (laminating processing device). (3) A method of applying a water-based heat-sealing agent in which a thermoplastic resin or a thermoplastic resin composition is dissolved or dispersed in water, or a solvent-based heat-sealing agent in which a thermoplastic resin or a thermoplastic resin composition is dissolved or dispersed in a solvent, a water-soluble polymer, its derivative or a mixture thereof, onto a paper substrate 100 by a known method such as roll coating, gravure roll coating or kiss coating.

[0065] By forming the seal layer 110 on the paper substrate 100 in the manner described above, the packaging substrate 10 according to the embodiment of the present invention is obtained.

[0066] [Example of packaging manufacturing method] 1 and 2, a description will be given of non-limiting examples of packaging formats applicable to the packaging body 1 according to the first embodiment and a method for manufacturing the packaging body 1. Note that even when the packaging base material 10 shown in Fig. 3 is used instead of the packaging base material 10 shown in Fig. 2, the packaging body 1 can be manufactured by a similar method.

[0067] The package 1 shown in FIG. 1 is a so-called caramel package type package, and can be manufactured, for example, through the steps described below.

[0068] (Step 1) A step of preparing a rectangular OPQR packaging substrate 10, as shown in FIG. 2, in which a sealing agent for sealing the packaging body 1 is applied to a predetermined area of ​​the packaging substrate 10 (the area indicated by hatching in the figure) to form a sealing layer 110.

[0069] 2, the MD direction (longitudinal direction) of the packaging substrate 10, and therefore the MD direction (longitudinal direction) of the paper substrate 100, is aligned with the B direction (width direction) in the figure, but in this embodiment, the direction in which the packaging substrate 10 (paper substrate 100) is used is not limited to this. The direction in which the packaging substrate 10 (paper substrate 100) is used may be determined according to the direction resulting from the fiber orientation of the paper, from the perspective of processability (ease of bending) when manufacturing the packaging body 1, the posture and strength (ease of tearing) of the packaging body 1 when made, and other desired properties.

[0070] (Step 2) A step of arranging five sanitary paper cartons (tissue cartons) 2, which are the packaged items and are stacked with their bottoms and tops facing each other, so that they face the back surface of the packaging base material 10 (the surface that will become the inner surface of the package 1) and so that the stacking direction of the sanitary paper cartons 2 coincides with the direction A indicated by arrow A in the figure.

[0071] (Step 3) The item to be packaged 2 is wrapped around the packaging substrate 10 so that the surface of the packaging substrate 10 (the surface that will become the outer surface of the packaging body 1) is facing outward, and both side end portions 12S of the packaging substrate 10 (the side end areas of the packaging substrate 10 indicated by the rectangle OPP1O1 and the side end areas of the packaging substrate 10 indicated by the rectangle RQQ1R1) are overlapped to package the item into a cylindrical shape.

[0072] In step 3, both side edges 12S of the packaging substrate 10 are joined and sealed via the seal layer 110 provided on the surface of the paper substrate 100 so that the front and back surfaces of the paper substrate 100 are in contact with each other.

[0073] Hereinafter, in this specification, this joining method of joining different surfaces (front and back surfaces) of the paper base material 100 together by bringing them into contact with each other will also be referred to as "overlap joining."

[0074] (Step 4) Next, at each of the opening ends (top and bottom ends) 12T, 12B of the cylindrical packaging formed in step 3, the portions of the packaging base material 10 that protrude from the periphery of the sanitary paper carton 2 are folded against each other to form two pairs of opposing flap-like portions, and these are joined along the end faces of the sanitary paper carton 2 to enclose the sanitary paper carton 2.

[0075] 2(a), the region of the upper end 12T of the packaging substrate 10 indicated by the rectangle OO2R2R and the region of the lower end 12B of the packaging substrate 10 indicated by the rectangle P2PQQ2 are folded along the mountain fold line UFL (dashed line) and the valley fold line DFL (dotted line) in the figure to form flap-like portions. The flap-like portions are joined via the seal layer 110 provided on the surface of the paper substrate 100, thereby obtaining the package 1 shown in FIG.

[0076] In this way, the upper and lower end portions 12T, 12B of the packaging substrate 10 are sealed by bonding the surfaces of the paper substrates 100 together via the respective sealing layers 110. Hereinafter, in this specification, this bonding method of bonding the same surfaces of the paper substrates 100 together by bonding them together will also be referred to as "hand-to-hand bonding."

[0077] In this specification, the "upper and lower ends" of the packaging substrate 10 and the "upper and lower ends" of the "upper and lower end surfaces" of the packaging body 1 refer to both ends in the direction A indicated by the arrow A in the drawings, and the "(both) side ends" of the packaging substrate 10 refer to (both) ends of the wound packaging substrate 10 in a direction intersecting the direction A, such as the direction B indicated by the arrow B in Figure 2. In addition, in this specification, the direction A indicated by the arrow A in the drawings is also referred to as the "height direction," and the direction B indicated by the arrow B in the drawings is also referred to as the "width direction."

[0078] Referring to FIG. 1, in this embodiment, when package 1 is lifted by handle 20, the load due to the weight of the packaged items acts mainly in the vertical direction. Thus, in this embodiment of the present invention, the direction parallel to the direction in which the load due to gravity of the packaged items acts when package 1 is in its normal position is also referred to as the "height direction." For example, in the example of FIG. 1, package 1 contains five tissue cartons. In package 1's normal position, the five tissue cartons are stacked with their bottoms and tops touching, and the package is carried in this state. Therefore, in this example, the stacking direction of the tissue cartons is the height direction, or direction A.

[0079] Through the above steps, in this embodiment employing the caramel packaging format, the sealing layer 110 is provided on the outer surface (front surface) of the packaging body 1, and both overlap sealing and hem sealing are performed. As a result, the packaging body 1 is sealed by a sealing part 12 having a sealing part 12S where both side edges of the packaging substrate 10 are overlapped and joined so that the front and back surfaces of the paper substrate 100 face each other, and sealing parts 12T and 12B where the upper and lower edges of the packaging substrate 10 are folded and joined so that mainly the surfaces face each other.

[0080] (Step 5) Next, a handle 20 for carrying the package 1 is attached to the main body of the package 1. The handle 20 is not an essential component of the embodiment of the present invention, but it is preferable to have one. The handle 20 in this example is strip-shaped, and both ends are joined to the outer surface of the package main body. This allows the user to insert their hand between the package main body and the handle 20 and grasp the handle 20.

[0081] The material of the handle 20 may be a film or a base material mainly made of paper (paper base material). In this example, the sealing agent contained in the seal layer 110 of the packaging base material 10 of the package 1 is a heat seal agent. In this case, using a paper base material for the handle 20 is preferable because it makes it possible to use the seal layer 110 of the packaging base material 10 of the package 1 to join the handle 20 to the package body. In this example, one-sided glazed paper or the like can be used as the paper material for the handle 20.

[0082] In the manufacturing process exemplified above, the packaging substrate 10 is prepared in advance and cut into a rectangular shape of a predetermined size in plan view, and one package 1 is manufactured, but the manufacturing method of the package 1 is not limited to this. For example, the packaging substrate 10 may be prepared in the form of a long continuous sheet, and in a subsequent process, the packaging substrate 10 may be cut at the same time as or after the sanitary paper carton 2 is placed on the packaging substrate 10, thereby manufacturing the package 1.

[0083] In an embodiment of the present invention, the overlapping ends of the packaging substrate 10 at the sealing portion 12 (12S, 12T, 12B) are joined together by a sealing agent contained in the seal layer 110 of the packaging substrate 10. When the sealing agent is a heat sealing agent, the joining is performed by heat sealing (thermal fusion), and when the sealing agent is an adhesive, the joining is performed by adhesion.

[0084] When the sealing agent is a heat-sealing agent, a known heat sealer can be used to heat-seal the heat-seal layer 110. During the heat-sealing process, heat and pressure are applied to the area of ​​the sealing portion 12 (12S, 12T, 12B) where the packaging substrate 10 is superimposed, causing the heat-sealing agent of the heat-seal layer 110 in that area to soften and melt. Phenomena such as microscopic penetration of the softened heat-sealing agent and mixing and integration of the melted heat-sealing agent occur, and after cooling, the sealing portion 12 (12S, 12T, 12B) to which the heat-sealing layer 110 is firmly bonded is obtained.

[0085] When the sealing agent is an adhesive, a certain amount of time is required for the adhesive to dry, but when the sealing agent is a heat sealing agent, it is preferable in that there is no need to consider the drying time.

[0086] [Basic weight] In this specification, the basis weight of the packaging substrate 10 and the basis weight of the paper substrate 100 are the basis weights per sheet (g / m ) measured in accordance with JIS P8124. 2 ) The basis weight of the sealing layer 110 can be calculated by subtracting the basis weight of the paper substrate 100 from the basis weight of the packaging substrate 10 in the area where the sealing layer 110 is provided. The basis weight of the packaging substrate 10 is measured in the non-sealed portion N12 of the package 1 (the non-jointed portion of the packaging substrate 10).

[0087] [Basis weight of packaging substrate] In an embodiment of the present invention, the basis weight of the packaging substrate 10 is 30 g / m 2 More than 90g / m 2 less than 35 g / m 2 More than 80g / m 2 Preferably, it is 35 g / m or less. 2 More than 70g / m 2 More preferably, it is:

[0088] When the basis weight of the packaging substrate 10 is low, the basis weight of the paper substrate 100 contained in the packaging substrate 10 is generally low, the constituent pulp fibers are few, the inter-fiber bonds are few, and the strength tends to be low and easy to tear. Therefore, from the viewpoint of the tear resistance of the packaging substrate 10, it is preferable that the basis weight of the packaging substrate 10 is high.

[0089] On the other hand, when the basis weight of the packaging substrate 10 is high, the paper thickness or density generally increases, and if the sealing layer is a heat-sealing layer, heat transfer during the heat-sealing process may become insufficient, causing the heating temperature of the heat-sealing layer to decrease and making it impossible to obtain good bonding strength. Therefore, from the viewpoint of the heat-sealing properties (adhesion) of the sealing portion 12 of the package 1, it is preferable that the basis weight of the packaging substrate 10 is low.

[0090] When the basis weight of the packaging substrate 10 is within the above range, the packaging substrate 10 has an appropriate strength and is not easily torn, and the heat sealability of the sealing portion 12 of the package 1 can be ensured.

[0091] [Seal layer basis weight] In an embodiment of the present invention, the basis weight of the sealing layer 110 is 5 g / m 2 More than 25g / m 2 In the case of the seal layer 110 formed by extruding a thermoplastic resin or a composition containing a thermoplastic resin onto a paper substrate 100, and the seal layer 110 formed by laminating a film made of a thermoplastic resin or a film containing a thermoplastic resin using a lamination processing device, the basis weight of the seal layer 110 is preferably 10 g / m or less. 2 More than 20g / m 2 In addition, when a heat sealing agent or adhesive is applied to the paper substrate 100, the basis weight of the sealing layer 110 is preferably 5 g / m or more and 10 g / m or less. 2 More preferably, it is:

[0092] When the basis weight of the sealing layer 110 is low, the thickness (amount) of the sealing layer (adhesive or heat sealing agent) that can be involved in bonding between the packaging substrates 10 to be joined is generally thin (small), and good adhesion (sealability) may not be obtained at the sealing portion 12.

[0093] Furthermore, as the basis weight of the sealing layer 110 increases, the sealing layer 110 generally becomes thicker. When the sealing layer 110 is a heat-sealing layer, if the sealing layer 110 becomes thicker, heat transfer may become insufficient during the heat-sealing process. In this case, it becomes difficult to obtain anchoring effects such as melting, fusion, and penetration of the heat-sealing agent into recesses, and good bonding strength may not be obtained, resulting in poor sealing properties.

[0094] When the basis weight of the sealing layer 110 is within the above range, the adhesiveness and heat sealability of the sealing portion 12 can be ensured.

[0095] [Packaging substrate thickness (paper thickness)] In an embodiment of the present invention, the thickness (paper thickness) 10th of the packaging substrate 10 is 35 μm or more and 100 μm or less, and preferably 40 μm or more and 80 μm or less.

[0096] The thickness of the packaging substrate (paper thickness) can be measured in accordance with ISO534:2011. The pressure on the pressurized surface during measurement is 100 kPa ± 10 kPa. The measurement is performed on the area of ​​the non-sealed portion N12 of the package 1, avoiding the sealed portion 12.

[0097] As described above, referring to Figures 1 and 2 or 3, the packaging substrate 10 has a sealed portion (jointed portion of the packaging substrate 10) 12 (12S, 12T, 12B) of the packaging body 1, which is the area where the ends of the packaging substrate 10 are overlapped and joined by the sealing layer 110 at the end, thereby sealing the packaging body 1, and a non-sealed portion (non-jointed portion of the packaging substrate 10) N12 of the packaging body 1, which is the other area.

[0098] The thickness 10th of the packaging substrate 10 is the thickness measured at the unsealed portion (unjoined portion of the packaging substrate 10) N12 of the packaging body 1. In the packaging body 1 shown in FIG. 1, the thickness of the packaging substrate 10 is measured in a region of the packaging substrate 10 that forms the side of the packaging body 1 and that does not contribute to sealing the packaging body 1, and that is wound in the circumferential direction of the sanitary paper carton 2 (direction B, perpendicular to direction A, indicated by arrow A, which is the stacking direction of the multiple sanitary paper cartons contained in the packaging body 1). This measurement region corresponds to the region indicated by the rectangle O3P3Q3R3 in the schematic development views of the packaging substrate 10 in FIGS. 2 and 3.

[0099] 2, in a configuration in which the sealing layer 110 is provided on the entire surface of the packaging substrate 10 and the non-sealing portion (non-joining portion) N12 includes the sealing layer 110, the thickness 10th of the packaging substrate 10 is the thickness including the paper substrate 100 and the sealing layer 110. Also, in a configuration in which the sealing layer 110 is provided on the sealing portion (joining portion of the packaging substrate 10) 12 of the packaging body 1 but the non-sealing portion (non-joining portion of the packaging substrate 10) N12 of the packaging body 1 does not include the sealing layer 110, the thickness 10th of the packaging substrate 10 is the thickness including the paper substrate 100 but excluding the sealing layer 110.

[0100] Hereinafter, in this embodiment, physical properties of the packaging substrate 10, such as thickness, basis weight, density, breaking elongation, burst strength, puncture strength, and transparency, are measured in the unsealed portion (unjoined portion of the packaging substrate 10) N12 of the package 1. Furthermore, the respective physical properties of the packaging substrate 10 are measured under the same humidity conditioning conditions as the sample humidity conditioning conditions, after conditioning a sample in accordance with JIS P8111.

[0101] When the thickness 10th of the packaging substrate 10 is thin, the basis weight of the packaging substrate 10 also tends to be small. As the basis weight decreases, the packaging substrate 10 becomes more prone to tearing.

[0102] If the thickness 10th of the packaging substrate 10 is small, the packaging substrate 10 is prone to tearing. On the other hand, if the thickness 10th of the packaging substrate 10 is large, heat transfer during heat sealing becomes insufficient, resulting in poor sealing properties.

[0103] When the thickness 10th of the packaging substrate 10 is 35 μm or more and 100 μm or less, the packaging substrate 10 is less likely to tear, and heat transfer during heat sealing is sufficient, resulting in good sealability.

[0104] [Density of packaging substrate] In an embodiment of the present invention, the density of the packaging substrate 10 is preferably 0.700 g / cm 3 More than 1.150g / cm 3 or less, more preferably 0.900 g / cm 3 More than 1.100g / cm 3 The following is the result.

[0105] The density of the packaging substrate is a calculated value obtained from the basis weight of the packaging substrate obtained by the above measurement method and the thickness (paper thickness) of the packaging substrate, and can be calculated by the formula "(basis weight of packaging substrate) ÷ (thickness (paper thickness) of packaging substrate)" (unit: g / cm 3 ).

[0106] In the range of basis weight of the packaging substrate defined in the above-described embodiment of the present invention, the density of the packaging substrate 10 is 0.700 g / cm 3 If the density is smaller than 1.150 g / cm3, the packaging substrate 10 contains fewer fibers, and therefore the inter-fiber bonding is less, making the packaging substrate 10 more likely to tear. 3 If it is larger, heat will not be transferred uniformly during heat sealing, resulting in poor sealing properties.

[0107] [Burst strength of packaging substrate] In an embodiment of the present invention, the burst strength of the packaging substrate 10 is preferably 105 kPa or more, and more preferably 110 kPa or more. The burst strength of the packaging substrate 10 is measured in the unsealed portion N12 of the package 1 (the unjoined portion of the packaging substrate 10).

[0108] The burst strength of the packaging substrate 10 can be measured in accordance with JIS P8112:2008.

[0109] If the burst strength of the packaging substrate 10 is low, the packaging substrate 10 is easily torn. If the burst strength of the packaging substrate 10 is 105 kPa or more, the packaging substrate 10 is not easily torn.

[0110] The burst strength of the packaging substrate can be adjusted by changing one or a combination of two or more of the following conditions during the papermaking process: (1) adjusting the blend of softwood pulp and hardwood pulp, (2) adjusting the freeness, (3) adjusting the J / W ratio, and (4) selecting or changing the type and amount of dry strength improver used in the paper base material 100; and (5) the type of sealing agent used in the sealing layer and (6) the basis weight of the sealing layer during the manufacture of the packaging substrate 10. Here, the J / W ratio is the ratio of the jet velocity (J), which is the ejection speed of the pulp dispersion in the papermaking machine when making the paper base material, to the wire speed (W), and is also called the jet-wire ratio.

[0111] [Puncture strength of packaging substrate] In an embodiment of the present invention, the puncture strength of the packaging substrate 10 is preferably 1.5 N or more, and more preferably 1.8 N or more. The puncture strength of the packaging substrate 10 is measured at the unsealed portion N12 of the package 1 (the unjoined portion of the packaging substrate 10).

[0112] The puncture strength of the packaging substrate 10 can be measured in accordance with JIS Z1707:2019.

[0113] If the packaging substrate 10 has a low puncture strength, the packaging substrate 10 is likely to tear from the portion where it comes into contact with the corner of the packaged item 2. If the packaging substrate 10 has a puncture strength of 1.5 N or more, the packaging substrate 10 is unlikely to tear from the portion where it comes into contact with the corner of the packaged item 2.

[0114] [Geometric mean breaking elongation of packaging substrate] In an embodiment of the present invention, the geometric mean elongation at break GE of the packaging substrate 10 is 2.5% or more, more preferably 2.6% or more, and even more preferably 2.7% or more.

[0115] If the geometric mean elongation at break of the packaging substrate 10 is small, the packaging substrate 10 is likely to tear at the portion where it comes into contact with the corners of the packaged item 2. If the geometric mean elongation at break of the packaging substrate 10 is 2.5% or more, the packaging substrate 10 is unlikely to tear at the portion where it comes into contact with the corners of the packaged item 2.

[0116] The geometric mean breaking elongation GE of the packaging substrate 10 is the geometric mean of the breaking elongation ET of the packaging substrate 10 in the height direction of the packaging body 1, which is parallel to the stacking direction of the multiple sanitary paper cartons 2 contained in the packaging body 1 (direction A indicated by arrow A in Figures 1 and 2), and the breaking elongation EH of the packaging substrate 10 in the width direction of the packaging body 1, which is perpendicular to the stacking direction of the multiple sanitary paper cartons 2 contained in the packaging body 1 (direction B indicated by arrow B in Figure 2), and can be calculated using the following formula (I):

[0117] GE = (ET × EH) 1 / 2 (I)

[0118] The breaking elongation ET of the packaging substrate 10 in the height direction of the packaging body 1 and the breaking elongation EH of the packaging substrate 10 in the width direction of the packaging body 1 are measured at the unsealed portion N12 of the packaging body 1 (the joint portion of the packaging substrate 10).

[0119] The breaking elongation ET of the packaging substrate 10 in the height direction (A direction) of the packaging body 1 and the breaking elongation EH of the packaging substrate 10 in the width direction (B direction) of the packaging body 1 can be measured simultaneously when measuring the tensile strength of the packaging substrate 10 in the height direction (A direction) of the packaging body 1 and the tensile strength of the packaging substrate 10 in the width direction (B direction) of the packaging body 1 in accordance with JIS P8113:2006.

[0120] Here, in one aspect of the embodiment of the present invention, the packaging substrate 10 is used so that the MD direction (papermaking direction, longitudinal direction, T direction) of the paper base material 100 included in the packaging substrate 10 is parallel to the width direction (B direction) of the package 1, and the CD direction (direction perpendicular to the papermaking direction, transverse direction, Y direction) of the paper base material 100 included in the packaging substrate 10 is parallel to the height direction (A direction) of the package 1, but the orientation of the packaging substrate 10 in the package 1 that is applicable to the present invention is not limited to this. In another aspect of the embodiment of the present invention, the packaging substrate 10 is used so that the MD direction (papermaking direction, longitudinal direction, T direction) of the paper base material 10 included in the packaging substrate 10 is parallel to the height direction (A direction) of the package 1, and the CD direction (direction perpendicular to the papermaking direction, transverse direction, Y direction) of the paper base material 100 included in the packaging substrate 10 is parallel to the width direction (B direction) of the package 1.

[0121] The geometric mean breaking elongation of the packaging substrate 10 can be controlled by adjusting the breaking elongation of the packaging substrate 10 in the height direction of the packaging body 1 and the breaking elongation of the packaging substrate 10 in the width direction of the packaging body 1, and as described above, the height direction of the packaging body 1 corresponds to the CD direction or MD direction of the packaging substrate 10, and the width direction of the packaging body 1 corresponds to the MD direction or CD direction of the packaging substrate 10. Therefore, the geometric mean breaking elongation of the packaging substrate 10 can be interpreted as the geometric mean breaking elongation of the breaking elongation in the MD direction (papermaking direction, longitudinal direction, T direction) of the packaging substrate 10 and the breaking elongation in the CD direction (direction perpendicular to the papermaking direction, transverse direction, Y direction) of the packaging substrate 10, and can be controlled by adjusting the breaking elongation in the MD direction of the packaging substrate 10 and the breaking elongation in the CD direction of the packaging substrate 10.

[0122] The breaking elongation in the MD direction of the packaging substrate 10 and the breaking elongation in the CD direction of the packaging substrate 10 can be adjusted by changing any one or a combination of two or more of the following conditions during the papermaking process of the paper substrate 100: (1) adjusting the ratio of softwood pulp to hardwood pulp; (2) adjusting the freeness; and during the production of the packaging substrate 10: (3) the type of sealing agent used in the sealing layer; and (4) the basis weight of the sealing layer.

[0123] [Effects of the first embodiment] When a packaged item 2 having corners, such as a tissue carton, is packaged with a packaging substrate 10 mainly made of a paper substrate 100, force is concentrated at the part where the corners come into contact, and the packaging substrate 10 tends to tear easily from the part where the corners come into contact.

[0124] As a result of extensive research to solve the above problems, the present inventors have found that increasing the basis weight of the packaging substrate 10 to prevent tearing can result in insufficient heat transfer during the heat sealing process for joining the packaging substrate 10 to seal the package 1, making it difficult to obtain good joint strength. In response to this, the present inventors have found that by controlling the basis weight and the geometric mean breaking elongation of the packaging substrate 10 within a predetermined range, it is possible to provide a package 1 packaged with a packaging substrate 10 mainly made of a paper substrate 100, which is less likely to tear at the portions where the corners of the packaged item 2 come into contact and which provides good sealability for the package 1.

[0125] The first embodiment of the present invention is a sanitary paper carton package in which a plurality of sanitary paper cartons are packaged with a packaging base material. The packaging base material has a layer structure including a paper base material and a seal layer for sealing the package, and the basis weight of the packaging base material is 30 g / m. 2 More than 90g / m 2 The geometric mean breaking elongation of the packaging substrate in the height direction of the packaging body and the breaking elongation of the packaging substrate in the width direction of the packaging body perpendicular to the height direction of the packaging body is 2.5% or more.

[0126] The sanitary paper carton packaging body 1 of the first embodiment is a packaging body in which the packaged item is packaged in a packaging base material mainly made of paper, and since the basis weight and geometric mean breaking elongation of the packaging base material 10 are within the specified ranges described above, the packaging base material 10 is less likely to tear at the parts where it comes into contact with the corners of the packaged item 2, and the packaging body 1 has excellent sealability, which is an exceptional effect.

[0127] <Second embodiment> Next, a second embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the first embodiment are also applicable to this aspect.

[0128] The second embodiment of the present invention is a preferred aspect of the first embodiment, and is characterized in that the sanitary paper carton packaging 1 has a tensile strength of 1.0 kN / m or more of the packaging substrate 10 in the height direction of the packaging 1. The tensile strength of the packaging substrate 10 in the height direction of the packaging 1 is preferably 1.2 kN / m or more, and more preferably 1.4 kN / m or more.

[0129] The tensile strength of the packaging substrate 10 in the height direction of the packaging body 1 is measured at the unsealed portion N12 of the packaging body 1 (the joint portion of the packaging substrate 10).

[0130] The tensile strength of the packaging substrate 10 in the height direction of the packaging body 1 is measured in accordance with JIS P8113: 2006. The height direction is the direction indicated by arrow A in Figures 1 to 3.

[0131] [Action and effect] 1, the height direction indicated by arrow A is a direction parallel to the direction in which the load from the packaged item 2 is applied when the packaging body 1 is lifted and transported, particularly when transporting by holding the handle 20. If the tensile strength of the packaging substrate 10 in the height direction of the packaging body 1 is low, the packaging substrate 10 is likely to tear when the packaging body 1 is transported. If the tensile strength of the packaging substrate 10 in the height direction of the packaging body 1 is 1.0 kN / m or more, the packaging substrate 10 is unlikely to tear when the packaging body 1 is transported.

[0132] [Means of achievement] The tensile strength of the packaging substrate 10 in the height direction of the packaging body 1 (direction A in the figure) and the tensile strength of the packaging substrate 10 in the horizontal direction of the packaging body 1 (direction B in the figure) can be adjusted by changing any one or a combination of two or more of the following conditions during the papermaking process of the paper substrate 100: (1) adjusting the blend of softwood pulp and hardwood pulp, (2) adjusting the freeness, (3) adjusting the J / W ratio, and (4) selecting or changing the type and amount of dry paper strength improver; and during the manufacturing process of the packaging substrate 10: (5) the type of sealing agent used in the sealing layer, and (6) the basis weight of the sealing layer.

[0133] <Third embodiment> Next, a third embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above-described embodiments are also applicable to this aspect.

[0134] The third embodiment of the present invention is a preferred aspect of the above-described embodiments, and is characterized in that the sanitary paper carton packaging 1 has a tensile strength of 2.0 kN / m or more of the packaging substrate 10 in the width direction of the packaging 1. The tensile strength of the packaging substrate 10 in the width direction of the packaging 1 is preferably 2.3 kN / m or more, and more preferably 2.5 kN / m or more.

[0135] The tensile strength of the packaging substrate 10 in the width direction of the packaging body 1 is measured at the unsealed portion N12 of the packaging body 1 (the joint portion of the packaging substrate 10).

[0136] The tensile strength of the packaging substrate 10 in the width direction of the package 1 is measured in accordance with JIS P8113: 2006. The width direction is the direction indicated by arrow B in FIGS.

[0137] [Action and effect] 1 and 2, the width direction indicated by arrow B in the figures is a direction perpendicular to the height direction indicated by arrow A, and is a direction parallel to the direction in which packaging substrate 10 is wound along the side of packaged item 2 during production of packaging body 1. If the tensile strength of packaging substrate 10 in the width direction of packaging body 1 is low, packaging processability during production of packaging body 1 is poor and packaging body 1 is prone to tearing. If the tensile strength of packaging substrate 10 in the width direction of packaging body 1 is 2.0 kN / m or more, packaging processability during production of packaging body 1 is good and packaging body 1 is less prone to tearing.

[0138] [Means of achievement] The tensile strength of the packaging substrate 10 in the height direction of the packaging body 1 (direction A in the figure) and the tensile strength of the packaging substrate 10 in the horizontal direction of the packaging body 1 (direction B in the figure) can be adjusted by changing any one or a combination of two or more of the following conditions during the papermaking process of the paper substrate 100: (1) adjusting the blend of softwood pulp and hardwood pulp, (2) adjusting the freeness, (3) adjusting the J / W ratio, and (4) selecting or changing the type and amount of dry paper strength improver; and during the manufacturing process of the packaging substrate 10: (5) the type of sealing agent used in the sealing layer, and (6) the basis weight of the sealing layer.

[0139] <Other> (1) Packaging format of package 1 In the above-described embodiment, a caramel packaging format is given as an example of the packaging format of the packaging body 1, but the packaging format applicable to the present invention is not limited to this. Any known packaging format, such as a gusset packaging format, may be adopted as the packaging format of the packaging body 1 according to the embodiment of the present invention. In particular, as long as it is practicable and consistent, any combination of joining methods, such as overlapping joining, in which different surfaces of the packaging substrate 10 are joined together, and flaps joining, in which the same surfaces of the packaging substrate 10 are joined together, may be adopted to seal the packaging body 1, as long as it is practicable and consistent.

[0140] In the above-described embodiment, a caramel packaging format is used, and packaging is performed so that the seal layer 110 of the packaging base material 10 faces the outer surface of the package 1, but the embodiment of the present invention is not limited to this. For example, when a packaging format using a butt-seamed seam, such as a gusset packaging format, is used, packaging may be performed so that the seal layer 110 of the packaging base material 10 faces the inner surface of the package 1.

[0141] According to a packaging format in which the sealing layer 110 of the packaging base material 10 is on the outer surface side of the packaging body 1, if the sealing layer 110 is a heat-seal layer, the sealing layer 110 of the packaging base material 10 of the packaging body 1 can be used to join the handle to the packaging body itself, for example, when it is desired to attach a strip-shaped handle made of a paper base material to the packaging body 1.

[0142] (2) Layer structure of packaging substrate 10 In one embodiment of the present invention, the packaging substrate 10 may be provided with other layers in addition to the sealing layer 110. Examples of other layers include functional layers such as a water vapor barrier layer, an oxygen barrier layer, a printing layer, a printability improving layer, an overprint layer, and a light-blocking layer. These other layers may be provided, as necessary, on the surface (front surface) of the packaging substrate 10 that will be the outer surface of the packaging body 1, the surface (back surface) of the packaging substrate 10 that will be the inner surface of the packaging body 1, between the paper substrate 100 and the sealing layer 110, or on the top surface of the sealing layer 110 so as not to impair the adhesiveness or heat-sealability of the sealing layer. The other layer may be a single layer, or two or more layers.

[0143] Even when the packaging substrate 10 includes other layers, the physical properties of the packaging substrate 10 according to the embodiment of the present invention are measured at the non-sealed portion N12 of the packaging body 1 (the joint portion of the packaging substrate 10). Therefore, for example, if the non-sealed portion N12 of the packaging body 1 includes a layer having some functionality as described above (hereinafter also referred to as a functional layer), the thickness (paper thickness) of the packaging substrate 10 will be a thickness including the thickness of the paper substrate and the thickness of the functional layer. Furthermore, if the non-sealed portion N12 of the packaging body 1 does not include the seal layer 110 and the functional layer as described above, the thickness (paper thickness) of the packaging substrate 10 will essentially be the thickness of the paper substrate.

[0144] (3) Proportion (mass ratio) of paper substrate in packaging substrate 10 In one embodiment of the present invention, the proportion (mass ratio) of the paper substrate 100 in the packaging substrate 10 is preferably 51 mass % or more.

[0145] The proportion of the paper substrate can be calculated as the percentage of the basis weight of the paper substrate in the basis weight of the packaging substrate using the formula "(basis weight of paper substrate) ÷ (basis weight of packaging substrate) × 100" (unit: %).

[0146] The basis weight of the packaging substrate used when calculating the proportion of the paper substrate is the basis weight including the non-jointed portion N12 and the jointed portions (12S, 12T, 12B) of the packaging substrate 10. Components other than the paper substrate 100 that make up the packaging substrate 10 include the sealant contained in the seal layer 110 and the functional materials contained in the functional layer described above, such as resin components. These components other than the paper substrate 100 are preferably biodegradable.

[0147] In Japan, the Resources Effective Utilization Promotion Act requires that composite materials made of plastic and paper have an identification mark for the predominant material by mass. That is, if the plastic content of the packaging substrate 10 exceeds 50% by mass, a plastic mark must be displayed, and if the paper content exceeds 50% by mass, a paper mark must be displayed.

[0148] When the proportion (mass ratio) of the paper base material 100 in the packaging base material 10 is 51 mass % or more, a paper mark can be displayed on the packaging base material 10. By displaying the paper mark, the packaging base material 10 of the package 1 can be disposed of in the same way as paper.

[0149] Furthermore, when the proportion (mass ratio) of paper base material 100 in packaging base material 10 is 51 mass % or more, the amount of resin used is significantly reduced compared to packaging films that are made of 100% general resin film, excluding biodegradable polyethylene film, polypropylene film, etc., which are commonly used in packaging sanitary paper cartons, making it possible to eliminate or reduce the use of plastic. [Example]

[0150] The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to the examples shown below.

[0151] Example 1 Glassine paper was used as the paper substrate, and a 15 μm thick polyethylene layer was extruded onto one side of the paper substrate (see Figure 2) to form a sealing layer, resulting in a packaging substrate. The glassine paper pulp blend was NBKP:LBKP in a mass ratio of 80:20, and the pulp beating degree (freeness) was 90 mL after mixing with NL pulp. The freeness was measured in accordance with JIS P8121-2:2012, showing irregular freeness, except that the pulp extraction amount was changed from 3 g / L to 0.3 g / L.

[0152] Five tissue cartons (180 packs of 2-ply tissues stacked pop-up style in a paper box measuring 227 mm x 116 mm x 62 mm high) were stacked vertically using the resulting packaging substrate, with the top and bottom facing each other, to form the packaged item (total weight 1210 g). The packaged item was packaged in a caramel packaging format with the sealing layer of the packaging substrate facing the outer surface of the package, to obtain the package body of Example 1 as shown in Figure 1. At this time, the packaged item was wrapped using the packaging substrate so that the height direction of the stacked five tissue cartons (direction A indicated by arrow A in Figure 1) was parallel to the CD direction of the paper substrate.

[0153] Next, both ends of a strip-shaped handle, the handle base of which was the same base as the packaging base of the package, were joined to the outer surface of the package via a heat seal layer to form a handle.

[0154] (Examples 2 to 4, Comparative Examples 1 and 2) Packages of Examples 2 to 4 and Comparative Examples 1 and 2 were obtained in the same manner as in Example 1, except that a paper base material (glassine paper) different in basis weight from that of Example 1 (glassine paper) was used.

[0155] (Examples 5 and 6) Packages of Examples 5 and 6 were obtained in the same manner as in Example 2, except that a paper base material (glassine paper) with a different pulp blending ratio from that of the paper base material (glassine paper) of Example 2 was used.

[0156] (Example 7, Example 8, Comparative Example 3) Packages of Examples 7 and 8 and Comparative Example 3 were obtained in the same manner as in Example 1, except that a paper base material (glassine paper) with a different pulp beating degree (freeness) from that of the paper base material (glassine paper) of Example 2 was used.

[0157] Example 9 The packaging of Example 9 was obtained in the same manner as in Example 2, except that single-sided glazed paper was used as the paper base material instead of glassine paper. The pulp blend of the single-sided glazed paper was NBKP:LBKP at a mass ratio of 50:50, and the beating degree (freeness) of the pulp after mixing with NL pulp was 360 ml. The basis weight of the paper base material (single-sided glazed paper) of Example 9 was smaller than the basis weight of the paper base material (glassine paper) of Example 2.

[0158] The seal layer was applied to the entire non-glossy side of the single-sided glossy paper, which had a relatively low smoothness, and the glossy side, which had a relatively high smoothness, was used as the side that came into contact with the tissue carton contained in the package.

[0159] Example 10 Instead of forming a polyethylene layer by extrusion on the entire surface of one side of the paper substrate to form a seal layer, a heat seal agent was applied to a portion of one side of the paper substrate (a predetermined area to be the joint of the packaging substrate, shown by hatching in (a) of Figure 3) to form a heat seal layer, and a package of Example 10 was obtained in the same manner as in Example 2. A polyolefin-based aqueous heat seal agent was used as the heat seal agent, and a roll coater was used for coating. The coating amount (basis weight) of the heat seal layer of Example 10 was 7.5 g / m 2 ) is the basis weight of the heat seal layer of Example 2 (14.0 g / m 2 ) was smaller.

[0160] (Comparative Example 3) A package of Comparative Example 3 was obtained in the same manner as in Example 2, using a paper base material (glassine paper) with a different pulp beating degree (freeness) from that of the paper base material (glassine paper) of Example 2.

[0161] Comparative Example 4 Instead of forming a polyethylene layer by extrusion on the entire surface of one side of the paper substrate to form a seal layer, a heat seal agent was applied to a portion of one side of the paper substrate (a predetermined area to be the joint of the packaging substrate, shown by hatching in (a) of Figure 3) to form a heat seal layer, and a package of Comparative Example 4 was obtained in the same manner as in Example 3. A polyolefin-based aqueous heat seal agent was used as the heat seal agent, and a roll coater was used for coating. The coating amount (basis weight) of the heat seal layer of Comparative Example 4 (7.5 g / m 2 ) is the basis weight of the heat seal layer of Example 3 (14.0 g / m 2 ) was smaller.

[0162] (Comparative Example 5) Instead of forming a polyethylene layer by extrusion on the entire surface of one side of the paper substrate to form a seal layer, a heat seal agent was applied to a portion of one side of the paper substrate (a predetermined area to be the joint of the packaging substrate, shown by hatching in (a) of Figure 3) to form a heat seal layer, and a package of Comparative Example 5 was obtained in the same manner as in Example 9. A polyolefin-based aqueous heat seal agent was used as the heat seal agent, and a roll coater was used for coating. The coating amount (basis weight) of the heat seal layer of Comparative Example 5 was 7.5 g / m 2 ) is the basis weight of the heat seal layer of Example 9 (14.0 g / m 2 ) was smaller than that. One-sided glossy paper was used as the paper substrate.

[0163] [Physical properties of packaging substrate] The physical properties of the paper substrate and packaging substrate used in each example are shown in Tables 1 to 3. The physical properties were measured in an environment conforming to Japanese Industrial Standard JIS P8111 (temperature 23±1°C, humidity 50±2% RH) after the samples were conditioned for 48 hours.

[0164] (basis weight of paper base material) Based on JIS P8124, the basis weight per sheet of paper (unit: g / m 2 ) was measured.

[0165] (Basis weight of packaging substrate) In accordance with JIS P8124, the basis weight per sheet of packaging substrate (unit: g / m 2 The measurement was carried out on the region of the non-sealed portion of the package (non-jointed portion of the packaging substrate), avoiding the sealed portion of the package (jointed portion of the packaging substrate).

[0166] (Seal layer basis weight) In each example (Examples 1 to 9 and Comparative Examples 1 to 3) in which the sealing layer was formed by extrusion, the basis weight of the sealing layer was calculated by subtracting the basis weight of the paper substrate from the basis weight of the packaging substrate obtained by the above measurement method, and was determined by the formula "(basis weight of packaging substrate) - (basis weight of paper substrate)" (unit: g / m 2 ).

[0167] (Sealing layer coating amount) For each example (Example 10 and Comparative Examples 4 and 5) in which the sealing layer was formed by coating with a roll coater, the coating amount of the sealing layer was determined as the coating amount of the sealing agent per unit area in the sealing agent-coated portion of the packaging substrate.

[0168] (Thickness of packaging substrate (paper thickness)) The thickness of the packaging substrate (paper thickness) was measured (unit: μm) in accordance with ISO534:2011. The pressure on the pressure surface during measurement was 100 kPa ± 10 kPa. Measurements were taken on the unsealed area of ​​the package, avoiding the sealed area.

[0169] (Density of packaging substrate) The density of the packaging substrate is a calculated value obtained from the basis weight of the packaging substrate obtained by the above measurement method and the thickness (paper thickness) of the packaging substrate, and was calculated using the formula "(basis weight of packaging substrate) ÷ (thickness of packaging substrate (paper thickness))" (unit: g / cm 3 ).

[0170] (Transparency of packaging substrate) The transparency of the packaging substrate was measured (unit: %) using a diffuse light transmittance meter DOT-5 (manufactured by Murakami Color Research Laboratory Co., Ltd.) in accordance with ISO 5-2. The measurement was performed on the unsealed area of ​​the package (the unjoined area of ​​the packaging substrate), avoiding the sealed area of ​​the package (the joined area of ​​the packaging substrate).

[0171] (Burst strength of packaging substrate) The burst strength of the packaging substrate was measured (unit: kPa) in accordance with JIS P8112:2008. The measurement was carried out on the unsealed area of ​​the package (unjoined area of ​​the packaging substrate), avoiding the sealed area of ​​the package (joined area of ​​the packaging substrate).

[0172] (Tensile strength of packaging substrate) The tensile strength of the packaging substrate in the height direction and the width direction of the package were measured (unit: kN / m) in accordance with JIS P8113:2006. The measurements were carried out on the unsealed area of ​​the package (unjoined area of ​​the packaging substrate), avoiding the sealed area of ​​the package (joined area of ​​the packaging substrate).

[0173] (Puncture strength of packaging substrate) In accordance with JIS Z1707:2019, the puncture strength of the front and back surfaces of the packaging substrate was measured five times each, and the average of the puncture strengths on both sides was calculated to be the puncture strength of the packaging substrate (unit: N). The measurement was carried out on the non-sealed area of ​​the package (non-jointed area of ​​the packaging substrate), avoiding the sealed area of ​​the package (jointed area of ​​the packaging substrate).

[0174] (Breaking elongation of packaging substrate) The breaking elongation of the packaging substrate can be measured simultaneously with the measurement of the tensile strength of the packaging substrate. When measuring the tensile strength of the packaging substrate in the height direction of the package and the tensile strength of the packaging substrate in the width direction of the package, the breaking elongation of the packaging substrate in the height direction of the package and the breaking elongation of the packaging substrate in the width direction of the package (unit: %) were also measured.

[0175] (Geometric mean breaking elongation of packaging substrate) The geometric mean breaking elongation (GE) of the packaging substrate is the geometric mean of the breaking elongation (ET) of the packaging substrate in the height direction of the package and the breaking elongation (EH) of the packaging substrate in the width direction of the package, both of which are obtained by the above-mentioned measurement method, and is calculated by the formula "{breaking elongation (ET) of the packaging substrate in the height direction of the package × breaking elongation (EH) of the packaging substrate in the width direction of the package}" 1 / 2 " (unit: %).

[0176] [Sensory test] The following sensory tests were carried out on the packages obtained in each example.

[0177] (Resistant to tearing of packaging substrate) The packaging obtained in each example was conditioned according to JIS P8111, and left to stand for three days under the same conditioned humidity conditions with the handle hanging from a hook, and the presence or absence of tears in the packaging base material at the point where the corner of the packaged item came into contact was observed. For each example, 20 packages were tested, and the percentage of packages that were not ripped was evaluated on a three-point scale. Evaluation was performed by one tester. The higher the evaluation number, the better the result (3 (excellent) → 1 (poor)).

[0178] (Sealability) The packaging obtained in each example was evaluated for adhesiveness between the wrapping papers at the joint where both ends of the wrapping paper overlap. Tests were conducted on 20 packaging pieces for each example, and the results were evaluated on a three-point scale (3 (excellent) → 1 (poor)), with the better the adhesive condition at the joint being, the better the sealing ability. Evaluation was performed by one tester.

[0179] (Visibility of packaged items) The packaging obtained in each example was evaluated by 30 testers regarding the ease of checking the appearance (design, color) of the wrapped item (tissue carton) from the outside of the packaging. The higher the evaluation number, the better the visibility (4 (excellent) → 1 (poor)).

[0180] [Test Results] The test results are shown in Tables 1 to 3. Note that Example 10 and Comparative Examples 4 and 5 do not have a seal layer in the non-jointed portion of the packaging substrate, which corresponds to the non-sealed portion of the package, and therefore the physical properties of the packaging substrate in Example 10 and Comparative Examples 4 and 5 are essentially the physical properties of the paper substrate.

[0181] [Table 1]

[0182] [Table 2]

[0183] [Table 3]

[0184] All of the samples in Example 1 to Comparative Example 5 (all samples) were tissue carton packages in which five tissue cartons were wrapped in a packaging base material, and the packaging base material was a kitchen paper roll package having a layer structure including a paper base material and a seal layer for sealing the package. The packages also had a strip-shaped handle.

[0185] (About the Examples) As shown in Tables 1 and 2, the tissue carton packages of Examples 1 to 10 all had a packaging substrate basis weight of 30 g / m 2 More than 90g / m 2 The geometric mean breaking elongation of the packaging substrate in the height direction of the packaging body, which is parallel to the stacking direction of the tissue cartons contained in the packaging body, and the geometric mean breaking elongation of the packaging substrate in the width direction of the packaging body, which is perpendicular to the stacking direction of the tissue cartons contained in the packaging body, was 2.5% or more.

[0186] The tissue carton packages of Examples 1 to 10 were all rated 2 (fair) or 3 (good) for "packaging substrate tear resistance" (4-point scale), meaning that the packaging substrate was resistant to tearing at the points where the corners of the packaged item came into contact.

[0187] In addition, the "sealability" (3-point scale) was rated 2 for Examples 1 and 4, which had higher basis weights and paper thicknesses of the packaging substrate, and the sealability of the Examples was rated 3, indicating that the Examples had good sealability.

[0188] Furthermore, in terms of the "visibility of the packaged item" (4-point scale), Example 9, in which the paper base material was glossy paper on one side, received a rating of 1, indicating poor visibility, whereas Examples 1 to 8 and Example 10, in which the paper base material was glassine paper, received a rating of 3 or 4, indicating good visibility.

[0189] (Comparative Example) In Comparative Example 1, the paper substrate had a lower basis weight than in Examples 1 to 4, and as a result, the basis weight of the packaging substrate was also low. The geometric mean breaking elongation of Comparative Example 1 (2.44%) was low, and the "tear resistance of the packaging substrate" was rated 1 (poor), meaning that it was easily torn.

[0190] In Comparative Example 2, the paper substrate had a higher basis weight than in Examples 1 to 4, and as a result, the basis weight of the packaging substrate was also high. The geometric mean breaking elongation of Comparative Example 2 (6.17%) was high, and the "tear resistance of the packaging substrate" was rated 3, indicating resistance to tearing. On the other hand, the paper thickness (83 μm) was high, and the sealing ability (rated 1) was poor, and the visibility was also rated low, with a transparency of 56.2% (rated 2).

[0191] In Comparative Example 3, the pulp had a higher degree of beating (freeness) and a lower degree of beating than in Example 2. In Comparative Example 3, the geometric mean breaking elongation (2.47%) was low, and the "tear resistance of the packaging substrate" was evaluated as 1 (poor), meaning that the packaging substrate was easily torn.

[0192] In Comparative Example 4, the coating method of the sealing agent was different from that in Example 3, and the coating amount (basis weight) of the sealing layer was low. The basis weight of the packaging substrate in Comparative Example 4 was 25.8 g / m 2The sealability was rated 3 and the visibility of the packaged item was rated 4, which were excellent. On the other hand, the basis weight was low, the geometric mean elongation at break (2.46%) was low, and the "tear resistance of the packaging substrate" was rated 1, which was poor.

[0193] In Comparative Example 5, the paper substrate was one-sided glossy paper, and compared to Example 9, which also used one-sided glossy paper, the coating method of the sealant was different and the coating amount (basis weight) of the seal layer was lower. The basis weight of the packaging substrate in Comparative Example 5 was 30.0 g / m 2 The sealability was rated as excellent, with a rating of 3. The geometric mean elongation at break (2.35%) was also low, and the "resistance to tearing of the packaging substrate" was rated as poor, with a rating of 1. Because the paper substrate was one-sided glossy paper, the visibility of the packaged item was rated as poor, with a rating of 1. [Explanation of symbols]

[0194] 1. Sanitary paper carton packaging (packaging) 2. Sanitary paper carton (tissue carton), (packaged item) 10 Packaging base material 20 Handle 100 Paper base material 110 Sealing layer (heat sealing layer, adhesive layer)

Claims

1. A sanitary paper carton package in which a plurality of sanitary paper cartons are packaged with a packaging base material, The packaging substrate has a layer configuration including a paper substrate and a seal layer for sealing the package, The basis weight of the packaging substrate is 30 g / m 2 80g / m or more 2 is as follows: A sanitary paper carton packaging body, characterized in that the geometric mean breaking elongation of the packaging base material in the height direction of the packaging body and the breaking elongation of the packaging base material in the width direction of the packaging body perpendicular to the height direction of the packaging body is 3.0% or more.

2. The sanitary paper carton package according to claim 1, wherein the packaging base material has a tensile strength of 1.0 kN / m or more in the height direction of the package.

3. 3. The sanitary paper carton package according to claim 1, wherein the packaging base material has a tensile strength of 2.0 kN / m or more in the width direction of the package.

4. The sanitary paper carton package according to any one of claims 1 to 3, wherein the transparency of the packaging base material is 60% or more.

5. The sanitary paper carton packaging according to any one of claims 1 to 4, wherein the paper base material is glassine paper.

6. The sanitary paper carton package according to any one of claims 1 to 5, wherein the package is packaged in a caramel packaging format.

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