Package and multiple-package

Abstract

To provide a package and a multiple-package which are capable of reducing the environmental load and are easy to open.SOLUTION: A package according to an embodiment, which has a first sheet and a second sheet and has a first edge portion and a second edge portion, includes a container portion constituted by the first sheet and the second sheet to contain a content, and a seal portion in which a periphery of the container portion in the first sheet and the second sheet is sealed and which seals the container portion. The first sheet has a first paper base material layer, and has a first three-dimensional molded portion that configures at least a part of the container portion and bulges outward in the first sheet. An opening assisting line for opening the container portion sealed by the seal portion is formed at least in the first sheet from the first edge portion toward the second edge portion, the first edge portion being formed therein with an opening starting portion connected to the opening assisting line.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a package and a multiple package. [Background technology]

[0002] 2. Description of the Related Art As described in Patent Document 1, a package configured using a sheet whose main material is resin is known as a package for containing contents such as food, medicine, and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-156474 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for reducing the environmental impact in the field of packaging. For this reason, it has been considered to use a sheet containing paper as a base material for the sheet constituting the packaging. In order to accommodate the contents in the packaging, the sheet using paper is required to have a certain degree of rigidity, but in this case, the sheet is difficult to break, making it difficult to open the packaging.

[0005] Therefore, an object of the present invention is to provide a package and a multiple package that can reduce the environmental impact and are easy to open. [Means for solving the problem]

[0006] [1] A package according to one aspect of the present invention has a first sheet and a second sheet disposed opposite the first sheet along a first direction, and has a first edge and a second edge located opposite the first edge in a second direction perpendicular to the first direction, the package comprising: a container portion constituted by the first sheet and the second sheet and containing a content; and a seal portion in the first sheet and the second sheet, the periphery of the container portion being sealed when viewed from the first direction, to hermetically seal the container portion, the first sheet having a first paper base layer and comprising at least a part of the container portion and including the first three-dimensional molded portion bulging outward in the first sheet, an opening assisting line for opening the container portion sealed by the seal portion is formed in at least the first sheet from the first edge portion to the second edge portion, and an opening initiation portion connected to the opening assisting line is formed in the first edge portion.

[0007] In the package described in [1] above, the first sheet has a first paper base layer. This reduces the environmental impact. The first sheet has a first three-dimensional molded portion. Such a first three-dimensional molded portion is formed by three-dimensional molding. Even if a paper suitable for three-dimensional molding is used for the paper base layer of the first sheet to which three-dimensional molding is applied, the package has an opening assist line formed thereon and an opening start portion formed at the first edge portion, so that the package is easy to open.

[0008] [2] In the package described in [1] above, the tear strength of the first paper base layer in one of two directions perpendicular to the first direction may be 1.5 N or more and 11 N or less, and the tear strength in the other direction may be 2.9 N or more and 10 N or less. A first paper base layer having such tear strength is difficult to break. However, since the package has an opening assist line, the package can be easily opened even if a first paper base layer having the above tear strength is used.

[0009] [3] In the package described in [1] or [2] above, the tear strength of the first sheet in one of two directions perpendicular to the first direction may be 4.3 N or more and 11.5 N or less, and the tear strength in the other direction may be 8 N or more and 20 N or less. A first sheet having such tear strength is difficult to break. However, since the package has an opening assist line, the package can be easily opened even if a first sheet having the above tear strength is used.

[0010] [4] In the packaging body according to any one of [1] to [3] above, the first paper base layer may have an elongation rate of 3% or more in each of two directions perpendicular to the first direction. Since such a first paper base layer is easy to elongate, it is difficult to break even when the first sheet is three-dimensionally molded. Therefore, it is easy to manufacture a packaging body using the first sheet having the first three-dimensionally molded portion.

[0011] [5] In the packaging body described in any one of [1] to [4] above, the second sheet has a second paper base layer and forms at least a part of the container portion together with the first three-dimensional molded portion, the second sheet has a second three-dimensional molded portion that bulges outward, and the opening assisting line may be formed on the first sheet and the second sheet.

[0012] In the package described in [5] above, the second sheet has a second paper base layer. This further reduces the environmental impact. The second sheet has a second three-dimensional molded portion. Such a second three-dimensional molded portion is also formed by three-dimensional molding. Even if a paper suitable for three-dimensional molding is used for the paper base layer of the second sheet to which three-dimensional molding is applied, the package is easy to open because an opening assist line is formed on the package.

[0013] [6] In the package described in [5] above, the tear strength of the second paper base layer in one of two directions perpendicular to the first direction may be 1.5 N or more and 11 N or less, and the tear strength in the other direction may be 2.9 N or more and 10 N or less. A second paper base layer having such tear strength is difficult to break. However, since the package has an opening assist line, the package can be easily opened even if a second paper base layer having the above tear strength is used.

[0014] [7] In the package described in [5] or [6] above, the tear strength of the second sheet in one of two directions perpendicular to the first direction may be 4.3 N or more and 11.5 N or less, and the tear strength in the other direction may be 8 N or more and 20 N or less. A second sheet having such a tear strength is difficult to break. However, since the package has an opening assist line, the package can be easily opened even if a second sheet having the above tear strength is used.

[0015] [8] In the package according to any one of [5] to [7] above, the second paper base layer may have an elongation rate of 3% or more in each of two directions perpendicular to the first direction. Since such a second paper base layer is easy to elongate, it is difficult to break even when the second sheet is three-dimensionally molded. Therefore, it is easy to manufacture a package using the second sheet having the second three-dimensionally molded portion.

[0016] [9] In the packaging body described in any of [1] to [8] above, a first end of the opening assisting line is connected to the opening initiation portion, and an opening stopping portion for stopping opening along the opening assisting line may be formed in at least the first sheet between a second end of the opening assisting line positioned opposite the first end and the second edge portion.

[0017] In the package described in [9] above, opening along the opening assist line stops at the opening stopper before reaching the second edge. Therefore, even if the package is opened, the package does not separate into two. Therefore, scattering of used packages is suppressed, and the package described in [9] contributes to, for example, environmental beautification.

[0018]

[10] In the package according to any one of [1] to [9] above, the container has a main body for accommodating the contents and a passage through which the contents pass when the contents are taken out from the main body, and the opening assisting line may be formed so as to cross the passage. In this case, the contents can be taken out of the package through the passage.

[0019]

[11] In the packaging body described in

[10] above, the passage portion may have a convex portion in which a part of an outer wall of the passage portion is bent outward.

[0020] In the package described in

[11] above, when the package is opened using the opening assist line, the passage portion of the package can be easily expanded by pushing the periphery of the passage portion from the side in the direction along the passage portion, so that the contents can be easily removed from the package.

[0021]

[12] In the package according to

[10] or

[11] above, the size of a cross section of the passage perpendicular to the direction in which the contents are taken out may decrease from the main body toward the end of the passage. In this case, even if the first sheet has a first paper base layer, wrinkles are unlikely to occur in the package.

[0022]

[13] A multiple package according to another aspect of the present invention includes a plurality of packages according to any one of [1] to

[12] above, the first sheet and the second sheet being common to the plurality of packages, and a cutting assistant line may be formed along the boundary between two adjacent packages among the plurality of packages. In this case, a plurality of packages are obtained by cutting the multiple package along the cutting assistant line. Each package is according to any one of [1] to

[12] above. Thus, each package reduces the environmental load and is easy to open. Effect of the Invention

[0023] According to the present invention, it is possible to provide a package and a multiple package that can reduce the environmental load and are easy to open. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view of a package according to one embodiment. [Diagram 2] FIG. 2 is a plan view of the packaging body shown in FIG. 1 as viewed from the first sheet side. [Diagram 3] FIG. 3 is a plan view of the packaging body shown in FIG. 1 as viewed from the second sheet side. [Figure 4] FIG. 4 is a cross-sectional view of the package taken along line IV-IV shown in FIG. [Diagram 5] FIG. 5 is a schematic diagram for explaining the layer structure of the first sheet and the second sheet. [Figure 6] FIG. 6 is a cross-sectional view of the package taken along line VI-VI shown in FIG. [Figure 7] FIG. 7 is a cross-sectional view of the package taken along line VII-VII shown in FIG. [Figure 8] FIG. 8 is an end view of the package taken along line VIII-VIII shown in FIG. [Figure 9] FIG. 9 is an end view of the package taken along line IX-IX shown in FIG. [Figure 10] FIG. 10 is a flow chart showing an example of a method for producing a packaging body. [Figure 11] FIG. 11 is a diagram for explaining the molding process. [Figure 12] FIG. 12 is a diagram for explaining the first sealing step. [Figure 13] FIG. 13 is a diagram for explaining an example of a test piece for a tear test. [Figure 14] FIG. 14 is a schematic diagram for explaining the tear test. [Figure 15] FIG. 15 is a diagram for explaining another example of the test piece for the tear test. [Figure 16] FIG. 16 is a plan view for explaining the first modified example of the packaging body. [Figure 17]FIG. 17 is an end view of the package taken along line XVII--XVII in FIG. [Figure 18] FIG. 18 is a diagram for explaining the second modified example of the packaging body. [Figure 19] FIG. 19 is a schematic diagram of a multiple packing body according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are given the same reference numerals. Duplicate explanations will be omitted. The dimensional ratios of the drawings do not necessarily correspond to those in the description.

[0026] Fig. 1 is a perspective view of a package according to one embodiment. Fig. 2 is a plan view of the package shown in Fig. 1 when viewed from the first sheet side. Fig. 3 is a plan view of the package shown in Fig. 1 when viewed from the second sheet side. Fig. 4 is a cross-sectional view of the package taken along line IV-IV shown in Fig. 2.

[0027] Package 1 is an item (or product) in which contents 2 (see Figure 4) are contained in a sealed state. Examples of contents 2 include food, medicine, cosmetics, etc. An example of a food is a liquid (or fluid) seasoning. Examples of liquid seasonings include soy sauce and dressing. An example of a fluid seasoning is mayonnaise. An example of a medicine is a suppository. When content 2 is a solid, the shape of the solid is not limited. For example, content 2 may be in powder or granular form. In the following description, unless otherwise specified, content 2 is a liquid seasoning (for example, soy sauce).

[0028] The packaging body 1 has a first sheet 10A and a second sheet 10B (a pair of sheets). For ease of explanation, as shown in Figures 2 to 4, the thickness direction of the first sheet 10A is referred to as the z direction (first direction), and two directions perpendicular to the z direction are referred to as the x direction and the y direction (second direction). The x direction and the y direction are perpendicular to each other.

[0029] The first sheet 10A and the second sheet 10B are disposed opposite each other in the z direction. Specifically, the first sheet 10A is overlapped on the second sheet 10B in the z direction. In this embodiment, the shapes of the first sheet 10A and the second sheet 10B are symmetrical with respect to a plane P (see FIG. 4) including a surface (joint surface) of the first sheet 10A where the second sheet 10B is in contact. Therefore, when viewed from the z direction, the shapes of the first sheet 10A and the second sheet 10B are the same. The plane P is a virtual surface (a surface extending from the joint surface) including the joint surface of the second sheet 10B of the first sheet 10A.

[0030] The first sheet 10A and the second sheet 10B are molded bodies in which parts of the first sheet 10A and the second sheet 10B are press molded (three-dimensionally molded) to form the container portion 20 of the packaging body 1. Specifically, the first sheet 10A is press molded to form the first portion 20a when the container portion 20 is divided by the surface P. The second sheet 10B is press molded to form the second portion 20b when the container portion 20 is divided by the surface P. The first portion 20a and the second portion 20b have a three-dimensionally molded portion 201. The three-dimensionally molded portion 201 is a bulging portion that bulges outward in the packaging body 1.

[0031] When the first sheet 10A has a three-dimensional molded portion (first three-dimensional molded portion) 201 as described above, the angle θ between the first sheet 10A and the surface P may be, for example, greater than 0 degrees and equal to or less than 50 degrees, or greater than 0 degrees and equal to or less than 40 degrees. An example of the lower limit of the angle θ may be 5 degrees. The angle θ corresponds to the rise angle of the first sheet 10A.

[0032] The radius of curvature of the top of the three-dimensional molded portion 201 is, for example, 1 mm or more, may be 2 mm or more, may be 10 mm or more, or may be 20 mm or more. An example of the upper limit of the radius of curvature is 150 mm, and may be 30 mm.

[0033] In the cross-sectional shape at a position passing through the apex of the three-dimensional molded portion 201, the ratio of the total length of the arc (the length along the curved surface of the arc in the cross section) to the chord length (the straight-line distance from one end of the arc to the other end) is, for example, 110% or less, and may be less than 110%. The ratio of the arc length to the total length of the chord may be set according to the volume of the storage space S of the package 1. The lower limit of the ratio of the arc length to the total length of the chord may be 101%.

[0034] The angle θ, the radius of curvature, etc. are set according to the shape of the container part 20. When the container part 20 is egg-shaped as shown in FIG. 1 or when the cross-sectional shape is circular or elliptical as shown in FIG. 4, for example, the angle θ is 5 degrees or more and 40 degrees or less, the radius of curvature is 2 mm or more and 30 mm or less, and the ratio of the arc length to the total length of the chord is 102% or more and 110% or less. When the package 1 or the container part 20 is tray-shaped, for example, the angle θ is 10 degrees or more and 40 degrees or less, the radius of curvature is 20 mm or more and 150 mm or less, and the ratio of the arc length to the total length of the chord is 102% or more and 110% or less. If the angle θ, the radius of curvature of the top of the three-dimensional molded part 201, and the ratio of the arc length to the total length of the chord are within the exemplified ranges, press molding can be performed even if the first sheet 10A is a paper sheet as described later.

[0035] Although the angle θ, radius of curvature, and the like of three-dimensional molded portion 201 have been explained using first sheet 10A as an example, the same applies to three-dimensional molded portion (second three-dimensional molded portion) 201 of second sheet 10B.

[0036] The peripheral edges of the first sheet 10A and the second sheet 10B are sealed. The first sheet 10A and the second sheet 10B are sealed, for example, by heat sealing. As a result, the package 1 has a sealed portion 30 around the container portion 20. In other words, the container portion 20 is an unsealed area where the first sheet 10A and the second sheet 10B are not sealed. The container portion 20 is sealed by the sealed portion 30. The hatching shown in Figures 2 and 3 is for clearly indicating the sealed portion 30.

[0037] The container portion 20 has a main body portion 21 that forms a storage space S that substantially stores the content 2, and a nozzle portion 22 that is continuously connected to the main body portion 21. The main body portion 21 is constituted by the above-mentioned three-dimensional molded portions 201 in each of the first portion 20a and the second portion 20b.

[0038] In this embodiment, the shape of main body 21 as viewed from the z direction (shape in plan view) is egg-shaped (or elliptical), and the shape of a cross section of main body 21 perpendicular to the x direction is oval or elliptical.

[0039] The nozzle portion 22 functions as a passage through which the contents 2 pass when the contents 2 are removed from the main body portion 21. As shown in Fig. 2 and Fig. 3, in this embodiment, the nozzle portion 22 extends in the x direction from the main body portion 21. Therefore, the x direction corresponds to the extension direction of the nozzle portion 22 and also corresponds to the removal direction when the contents 2 are removed from the package 1.

[0040] The length L1 in the x direction (maximum length in the x direction) and the length L2 in the y direction (maximum length in the y direction) of the packaging body 1 shown in FIG. 2 are designed according to the application of the packaging body 1. An example of the length L1 is 60 mm or more and 120 mm or less. The length L1 may be 60 mm or more and 80 mm or less, or 80 mm or more and 120 mm or less. An example of the length L2 is 30 mm or more and 60 mm or less. The length L2 may be 30 mm or more and 40 mm or less, or 40 mm or more and 60 mm or less.

[0041] The thickness (maximum length in the z direction) of the packaging body 1 is also designed according to the application of the packaging body 1. An example of the thickness of the packaging body 1 is 5 mm or more and 20 mm or less. The thickness T of the packaging body 1 (see FIG. 4) may be 5 mm or more and 10 mm or less, or 10 mm or more and 20 mm or less. The thickness T is the length of the packaging body 1 at the point of the packaging body 1 that is the longest distance in the z direction, and may be, for example, the length between the tops of the three-dimensional molded portions 201 of the first sheet 10A and the second sheet 10B as shown in FIG. 4.

[0042] As shown in FIG. 2, the width L3 of the nozzle portion 22 in the y direction is smaller than the maximum width of the main body portion 21 in the y direction (corresponding to the length L2). An example of the length of the width L3 is 5 mm or more and 15 mm or less. The length of the nozzle portion 22 in the x direction is, for example, 10 mm or more. The upper limit of the length of the nozzle portion 22 in the x direction depends on the size of the packaging body 1, but is, for example, 30 mm. The seal width W of the seal portion 30 is appropriately set depending on the application, shape, size, etc. of the packaging body 1. An example of the seal width W is 1 mm or more and 10 mm or less. The seal width W is, for example, 1 mm.

[0043] As shown in FIG. 4, if the thickness of the sealed portion 30 is t1, the thickness of the portion of the first sheet 10A other than the sealed portion 30 is t2a, the thickness of the portion of the second sheet 10B other than the sealed portion 30 is t2b, and the sum of the thicknesses t2a and t2b is t2, the ratio (t1 / t2) of the thickness t1 to the thickness t2 may be 98% or less, or may be 95% or less. The lower limit of the ratio (t1 / t2) may be 90%. The thicknesses t2a and t2b may be the thicknesses of the first sheet 10A and the second sheet 10B at a position a certain distance away from the sealed portion 30, such as near the top of the three-dimensional molded portion 201. Such thicknesses are substantially the same as the thicknesses of the first sheet 10A and the second sheet 10B prepared for the manufacture of the package 1.

[0044] The first sheet 10A and the second sheet 10B will now be described further.

[0045] The first sheet 10A and the second sheet 10B are paper sheets. A paper sheet is a sheet in which paper is the main material. A paper sheet is a sheet that satisfies the condition that the ratio of the mass of paper to the mass of the paper sheet (hereinafter referred to as the "paper ratio") is 51% or more. The paper ratio of the paper sheet may be 100% or less.

[0046] An example of the thickness of the first sheet 10A and the second sheet 10B is 120 μm or more and 500 μm or less. The thickness of the first sheet 10A and the second sheet 10B may be, for example, 120 μm or more and 250 μm or less, or 250 μm or more and 500 μm or less. In this embodiment, the thickness of the first sheet 10A and the second sheet 10B is the same, but the thickness of the first sheet 10A and the second sheet 10B may be different.

[0047] The first sheet 10A and the second sheet 10B are sheets that can achieve a degree of elongation that allows press molding. For example, the first sheet 10A and the second sheet 10B may be sheets whose elongation rates in the x direction and the y direction are 3% or more, or 5% or more. The elongation rates of the first sheet 10A and the second sheet 10B may be, for example, about 10%. The elongation rates may be values ​​measured in accordance with JIS P 8113 2006. The upper limit of the elongation rate is, for example, 12%. The first sheet 10A and the second sheet 10B are sheets that have a property that allows them to be sealed.

[0048] An example of the layer structure of the first sheet 10A and the second sheet 10B will be described with reference to Fig. 5. Fig. 5 is a schematic diagram for explaining the layer structure of the first sheet 10A and the second sheet 10B. In this embodiment, the first sheet 10A and the second sheet 10B have the same layer structure. Therefore, the first sheet 10A and the second sheet 10B will be referred to as "sheet 10", and the layer structures of the first sheet 10A and the second sheet 10B will be described.

[0049] The sheet 10 has a paper base layer (first paper base layer or second paper base layer) 11. The paper base layer 11 is made of a single layer paper. The single layer paper includes, for example, a plurality of first fibers and a plurality of second fibers. The length of each of the plurality of first fibers is longer than the length of each of the plurality of second fibers. The length of each of the plurality of first fibers is preferably 4 mm or less. The length of each of the plurality of second fibers is preferably 0.2 mm or more and 1.5 mm or less.

[0050] The content of the first fibers in the single layer paper may be 50 percent or more. The content of the first fibers in the single layer paper is the number of the first fibers contained in the single layer paper divided by the number of fibers contained in the single layer paper. The lengths of the first fibers and the second fibers are calculated based on an optical automatic measurement method defined in JAPAN TAPPI Paper and Pulp Testing Method No. 52 (Testing Method for Fiber Length of Paper and Pulp).

[0051] The basis weight of the paper base layer 11 is 30 g / m 2 Above 300g / m 2 The basis weight is 50 g / m 2 Above 200g / m 2 The basis weight of single-ply paper is measured according to the method for measuring the basis weight of paper specified in the JIS standard (JIS P 8124:2011).

[0052] The paper base layer 11 may be a layer that satisfies the condition C1. (Condition C1) The tear strength in the x direction may be, for example, 1.5 N or more and 11 N or less, and the tear strength in the y direction may be 2.9 N or more and 10 N or less. The x direction corresponds to the MD (Machine Direction) direction, and the y direction corresponds to the TD (Transverse Direction) direction. With regard to paper, the direction perpendicular to the MD direction is called the CD (Cross Direction) direction, but in the following, in order to describe the tear strength of the sheet 10, etc., in this specification, the direction perpendicular to the MD direction is called the TD direction.

[0053] The tear strength of the paper base layer 11 in the x direction may be 1.8 N or more and 8.5 N or less, and the tear strength in the y direction may be 3 N or more and 8 N or less. The tear strength of the paper base layer 11 in the x direction may be 2 N or more and 3.5 N or less, and the tear strength in the y direction may be 3.4 N or more and 5.5 N or less.

[0054] The above tear strength is a value measured according to a method in accordance with JIS K7128-1, specifically, based on the trouser test method described in JIS K7128-1.

[0055] The paper base layer 11 may be a layer that satisfies condition C2. (Condition C2) The elongation in the x direction and the y direction (two directions perpendicular to the thickness direction of the sheet 10) is 3% or more.

[0056] The elongation percentage may be, for example, 5% or more. The higher the elongation percentage, the more preferable, but it is, for example, 12% or less. The elongation percentage may be 3% or more and 12% or less. An example of the elongation percentage is about 10%.

[0057] The above-mentioned elongation percentage corresponds to the "tensile elongation at break" in the above-mentioned JIS P 8113 2006, and may be a value measured in accordance with the above-mentioned JIS P 8113 2006.

[0058] Examples of the paper base layer 11 include coated paper, uncoated paper, lightly coated paper, bleached paper, unbleached paper, semi-bleached paper, single-ply paper, multi-ply paper, internally added paper (paper imparted with functions such as water resistance and oil resistance by internal addition), externally added paper (paper imparted with functions such as water repellency and oil repellency by external addition), etc. The paper base layer 11 is, for example, FibreForm manufactured by Billerud Aktiebolag (publ), and has a basis weight of, for example, 100 g / m 2 , 115g / m 2 , 150g / m 2 , 165g / m 2 or 200 g / m 2 It is a fiber form.

[0059] Although it depends on the application, shape, size, etc. of the packaging body 1, the paper used for the paper base layer 11 may have a loop stiffness of, for example, 400 Nm or less, or 200 Nm or less. The loop stiffness may be a value measured as the compressive stress of a loop when the sample width is 15 mm and the loop length is 100 mm using a Loop Stiffness Tester (registered trademark) manufactured by Toyo Seiki Seisakusho Co., Ltd. The lower limit of the loop stiffness may be 200 mN or 100 mN.

[0060] The sheet 10 may have an inner layer 12. The inner layer 12 is a layer located on the inside of the paper base layer 11 in the package 1. The inner layer 12 has a seal layer 12a having a sealability. The material of the seal layer 12a is a material that has a sealability (for example, a heat sealability) and is stretchable to such an extent that the sheet 10 can be press-molded. For example, the inner layer 12 also has the elongation rate exemplified for the paper base layer 11, and an example of the elongation rate of the inner layer 12 is about 10%. When the inner layer 12 is composed of a plurality of layers, each layer may have the elongation rate exemplified for the paper base layer 11. The material of the seal layer 12a is, for example, polyolefin. For example, the seal layer 12a may be polyethylene (PE) or a copolymer resin of ethylene and methacrylic acid (EMAA). The seal layer 12a may have a structure in which a layer formed of PE and a layer formed of EMAA are laminated.

[0061] The inner layer 12 may have a barrier layer 12b on the paper base layer 11 side with respect to the seal layer 12a. The barrier layer 12b is a layer that blocks at least one of liquid and gas depending on the contents 2 in order to protect the contents 2 from the outside of the package 1 or to prevent the contents 2 from leaking out of the package 1. The material of the barrier layer 12b is a material that has barrier properties and stretches to an extent that the sheet 10 can be press-molded. Examples of the material of the barrier layer 12b include ethylene-vinyl alcohol copolymer resin (EVOH), K-coated nylon (K-NY), polyvinylidene chloride (PVDC), and polychlorotrifluoroethylene resin (PETE). If the sheet 10 including the barrier layer 12b can be stretched to an extent that it can be press-molded, the barrier layer 12b may be a metal layer (for example, an aluminum layer).

[0062] An example of the inner layer 12 is a film in which a PE film, an EVOH film, and a PE film are laminated. In this case, for example, the inner layer 12 is a multi-layer co-extruded film of a PE film, an EVOH film, and a PE film.

[0063] The sheet 10 may have an outer layer 13 located outside the paper base layer 11 in the package 1. The outer layer 13 may have a function of protecting the paper base layer 11. For example, when the contents 2 are liquid, the outer layer 13 may be a layer having hydrophobic properties. In the manufacture of the package 1, when liquid as the contents 2 is supplied to the container portion 20, the liquid may adhere to the outer surface of the package 1. Even in such a case, since the paper base layer 11 is protected by the outer layer 13, it is possible to suppress the liquid from penetrating into the paper base layer 11. An example of the material of the hydrophobic outer layer 13 is polyolefin. An example of the outer layer 13 is a layer formed of PE. Although the material of the hydrophobic outer layer 13 has been exemplified, the properties of the outer layer 13 may be in accordance with the properties of the contents 2, and the material of the outer layer 13 may be in accordance with the properties of the outer layer 13. For example, the outer layer 13 also has the elongation rate exemplified for the paper base layer 11.

[0064] When the sheet 10 has a multi-layer structure, the method for laminating each layer is not limited, but examples of the lamination method include extrusion lamination and dry lamination.

[0065] An example of the layer structure of the sheet 10 is the following layer structure A. In the following, specific examples of the materials and thicknesses of each layer of the layer structure A are given, but the layer structure of the sheet 10 is not limited to the layer structure A. (Layer composition A) 1st PE film / paper base layer / 2nd PE film / multi-layer co-extrusion film

[0066] In the layer configuration A, the thickness of the first PE film is 20 μm, and the basis weight of the paper base layer is 150 g / m 2 and the thickness of the second PE film is 20 μm. In the layer structure A, the multilayer coextruded film is a film in which a PE film, an EVOH film, and a PE film are laminated in this order from the second PE film side. In the layer structure A, the thickness of the multilayer coextruded film is 50 μm. In the layer structure A, the paper content of the sheet 10 is, for example, 65% by mass.

[0067] The above layer structure A can be formed by extrusion laminating a multi-layer coextruded film to the inner surface of the paper base layer 11 (the surface on the multi-layer coextruded film side) and extrusion laminating PE to the outer surface of the paper base layer 11 (the surface opposite the inner surface).

[0068] The sheet 10 may have a printed layer on the outside of the paper base layer 11 in the package 1. The printed layer may be a layer in which a plurality of ink layers are laminated. The printed layer may have a function of making discoloration of the package 1 caused by the contents 2 penetrating into the paper base layer 11 less noticeable, for example. In this case, the printed layer has an ink layer of at least the same color as the color of the contents 2. The printed layer may have a light-shielding function. The printed layer may be provided, for example, in an area of ​​the sheet 10 corresponding to the nozzle portion 22 and its surroundings. When the sheet 10 has, for example, an outer layer 13, the printed layer may be provided between the outer layer 13 and the paper base layer 11, or the printed layer may be provided on the opposite side of the outer layer 13 to the paper base layer 11.

[0069] The sheet 10 may have layers (e.g., a resin layer) other than the layers exemplified above. When the sheet 10 includes layers other than the paper base layer 11 as described above, the paper content of the sheet 10 is less than 100%, for example, 80% or less.

[0070] The sheet 10 may be a sheet that satisfies condition C3. (Condition C3) The tear strength (N) in the x direction may be, for example, 4.3N or more and 11.5N or less, and the tear strength in the y direction may be 8N or more and 20.0N or less.

[0071] In the sheet 10, the x direction corresponds to the MD direction, and the y direction corresponds to the TD direction.

[0072] The tear strength of the sheet 10 in the x direction may be 4.8N or more and 9N or less, and the tear strength in the y direction may be 8.3N or more and 15.4N or less.

[0073] The packaging body 1 will be further described with reference to Figures 1 to 3. As shown in Figures 1 to 3, the packaging body 1 has a first edge 1a and a second edge 1b when viewed from the z direction. The first edge 1a and the second edge 1b are both edges of the packaging body 1 in the width direction (the y direction in this embodiment).

[0074] The packaging body 1 has an opening assisting line 3 for opening the packaging body 1 from the first edge portion 1a toward the second edge portion 1b. The opening assisting line 3 is formed on the first sheet 10A and the second sheet 10B. The opening assisting line 3 is a weakened processed portion for assisting in opening the packaging body 1. In this embodiment, the opening assisting line 3 is formed so as to cross the nozzle portion 22. The opening assisting line 3 is formed, for example, in the vicinity of the tip of the nozzle portion 22. The opening assisting line 3 may be formed in a non-three-dimensionally molded region (or a non-bulging region) in the nozzle portion 22 that is not three-dimensionally molded. The non-three-dimensionally molded region 221 in the nozzle portion 22 is a region where the first sheet 10A and the second sheet 10B are in contact with each other.

[0075] The opening assisting line 3 may be formed in a perforated line (broken line) or a continuous straight line (or wavy line). The opening assisting line 3 may be formed, for example, by fully cutting the paper base layer 11 in the thickness direction or by half-cutting the paper base layer 11. When the first sheet 10A and the second sheet 10B have layers other than the paper base layer 11, the opening assisting line 3 may be formed by processing the layers other than the paper base layer 11 as well. The opening assisting line 3 is formed at a corresponding position on the first sheet 10A and the second sheet 10B. That is, the opening assisting line 3 formed on the first sheet 10A is located on the opening assisting line 3 formed on the second sheet 10B.

[0076] The opening assisting line 3 may be formed by laser processing using a laser beam, or may be formed by slit processing with a cutting blade. The opening assisting line 3 formed by a laser beam may be called a laser processing line.

[0077] The opening assisting line 3 has a first end 3a and a second end 3b. The first end 3a is connected to the first edge 1a. The second end 3b is the end opposite to the first end 3a.

[0078] An opening start portion 4 is formed at the connection point of the first edge portion 1a with the first end portion 3a. Therefore, the first end portion 3a is connected to the opening start portion 4. The opening start portion 4 is a portion that should serve as an opening trigger. The opening start portion 4 may be a notch. The planar shape of the opening start portion 4 is not limited to the V-shape shown in Figs. 1 to 3. The planar shape of the opening start portion 4 may be an I-shape (or linear shape) or a Y-shape. The I-shaped notch corresponds to the cut line.

[0079] The opening assisting line 3 does not have to reach the second edge portion 1b as shown in Figures 2 and 3. In this case, the second end portion 3b of the opening assisting line 3 is located within the seal portion 30 between the nozzle portion 22 and the second edge portion 1b.

[0080] An opening stopper 5 that stops the opening of the package 1 along the opening assisting line 3 may be formed between the second end 3b and the second edge 1b. The opening stopper 5 is formed at a corresponding position on the first sheet 10A and the second sheet 10B. That is, the opening stopper 5 formed on the first sheet 10A is located on the opening stopper 5 formed on the second sheet 10B.

[0081] The opening stopper 5 is a portion that stops the tearing of the package 1 along the opening assisting line 3. The opening stopper 5 is formed between the second end 3b and the second edge 1b so that at least a part of the opening stopper 5 is located on an extension of the opening assisting line 3.

[0082] 2 and 3, the opening preventing portion 5 is a linear opening preventing portion extending in a direction intersecting with the extension direction of the opening assisting line 3. The opening preventing portion 5 is formed at a corresponding position on the first sheet 10A and the second sheet 10B. The linear opening preventing portion 5 can be formed in the same manner as the opening assisting line 3. The opening preventing portion 5 may be a hole.

[0083] Fig. 6 is a cross-sectional view of the package 1 taken along line VI-VI shown in Fig. 2. The contents 2 are not shown in Fig. 6. Fig. 7 is an end view of the package 1 taken along line VII-VII shown in Fig. 6. Fig. 8 is an end view of the package 1 taken along line VIII-VIII shown in Fig. 7. Fig. 9 is an end view of the package 1 taken along line IX-IX shown in Fig. 6.

[0084] As shown in Figs. 6 to 9, the container portion 20 may be tapered from the vicinity of the connection between the main body portion 21 and the nozzle portion 22 toward the tip of the nozzle portion 22 (the side opposite to the main body portion 21). In other words, the cross section of the container portion 20 may become smaller from the vicinity of the connection between the main body portion 21 and the nozzle portion 22 toward the tip of the nozzle portion 22. This tapered portion where the first sheet 10A and the second sheet 10B are not in contact is also referred to as a three-dimensional molded portion 202. The three-dimensional molded portion 202 also constitutes at least a part of the container portion 20, and is a portion that bulges outward in the first sheet 10A and the second sheet 10B.

[0085] As shown in Figures 7 to 9, the cross-sectional shape of the packaging body 1 may gradually deform from near the connection between the main body portion 21 and the nozzle portion 22 toward the tip side of the nozzle portion 22 into an oval or elliptical shape, a diamond shape, or a flat shape (i.e., a state in which the first sheet 10A and the second sheet 10B are in contact).

[0086] Next, an example of a method for manufacturing the package 1 will be described. Fig. 10 is a flow chart showing an example of the method for manufacturing the package 1. As shown in Fig. 10, the example of the method for manufacturing the package 1 includes a preparation step S1, a molding step S2, a first sealing step S3, a supplying step S4, a second sealing step S5, an opening start portion forming step S6, and a separation step S7. For ease of explanation, a method for manufacturing the package 1 in a form in which the first sheet 10A and the second sheet 10B have at least an inner layer 12 together with the paper base layer 11 as shown in Fig. 5 will be described.

[0087] (1) Preparation process S1 In the preparation step S1, a strip-shaped first sheet 100A (original sheet) having the same layer structure as the first sheet 10A is prepared. Since the first sheet 100A has the same layer structure as the sheet 10, the first sheet 100A is a paper sheet. The first sheet 100A is formed by, for example, an extrusion lamination method, a dry lamination method, or the like. In the preparation step S1, similarly to the first sheet 100A, a strip-shaped second sheet 100B (original sheet) having the same layer structure as the second sheet 10B is prepared.

[0088] In the preparation step S1, the first sheet 100A and the second sheet 100B are prepared, on which the opening assisting line 3 is formed. That is, the preparation step S1 has an opening assisting line forming step S1a for forming the opening assisting line 3. The opening assisting line 3 is formed in the first sheet 100A and the second sheet 100B in the region where the package 1 is to be formed, at the position described with reference to Figs. 1 to 3.

[0089] The method for forming the opening assisting line 3 may be a method using laser processing as described above, or a method using a cutting blade. For example, the opening assisting line 3 can be formed by moving the laser light along the x direction while focusing the laser light on the formation position of the opening assisting line 3. When forming the opening assisting line 3 by laser processing, a laser light having a wavelength (for example, 9 μm or more and 11 μm or less) capable of processing the first sheet 10A and the second sheet 10B may be used. The laser light is a continuous light or a pulsed light.

[0090] When the opening assisting line 3 is formed only on the paper base layer 11, the opening assisting line 3 may be formed in advance on the paper base layer 11 and then the first sheet 100A and the second sheet 100B may be formed, or the first sheet 100A and the second sheet 100B may be constructed including the paper base layer 11 and then the opening assisting line 3 may be formed on the first sheet 100A and the second sheet 100B.

[0091] In this specification, "an opening assisting line 3 is formed in a certain layer (hereinafter referred to as "layer a")" means that processing (laser irradiation, cutting, etc.) has been performed on layer a to form the opening assisting line 3.

[0092] If the first sheet 100A and the second sheet 100B are composed of multiple layers including the paper base layer 11 and the opening assisting line 3 is formed in layers other than the paper base layer 11, the opening assisting line 3 can be formed on the first sheet 100A and the second sheet 100B after the first sheet 100A and the second sheet 100B are constructed.

[0093] When the package 1 to be manufactured has an opening stopper 5, a preparation step S1 prepares a first sheet 100A and a second sheet 100B further formed with the opening stopper 5. The opening stopper 5 may be formed at the same time as forming the opening assisting line 3, or may be formed at a different timing.

[0094] In the following, a process for the first sheet 100A and the second sheet 100B on which the opening assisting line 3 and the opening stopper portion 5 are formed in the preparation process S1 will be described.

[0095] (2) Molding process S2 In the molding step S2, the first sheet 100A and the second sheet 100B are press molded (or embossed). The molding step S2 will be described using the case where the first sheet 100A is press molded as an example. The molding method is not limited to press molding, and pressure molding, vacuum pressure molding, etc. may also be used.

[0096] FIG. 11 is a diagram for explaining the molding step S2. FIG. 11 illustrates a case where the first sheet 100A is press-molded. As shown in FIG. 11, the first sheet 100A is passed through a press device 40 while being conveyed in its longitudinal direction, and the first portion 20a of the container portion 20 is press-molded. Such press molding can be performed by passing the first sheet 100A between a concave mold 41 and a convex mold 42 of the press device 40, and pressing the first sheet 100A with the concave mold 41 and the convex mold 42. In the molding step S2, a plurality of first portions 20a are molded into the first sheet 100A along the longitudinal direction of the first sheet 100A.

[0097] As described above, the molding step S2 is performed after preparing the first sheet 100A on which the opening assisting line 3 and the opening stopper portion 5 are formed. Therefore, the opening assisting line 3 and the opening stopper portion 5 are also formed in the area of ​​the first sheet 100A before it is carried into the press device 40. However, in Fig. 11, in order to illustrate the positional relationship of the opening assisting line 3 and the opening stopper portion 5 with respect to the first portion 20a, the opening assisting line 3 and the opening stopper portion 5 are illustrated at the location where the first portion 20a is illustrated. Although Fig. 11 illustrates only one first portion 20a, multiple first portions 20a are molded at regular intervals.

[0098] Similarly, the second sheet 100B is press-molded to form a plurality of second portions 20b.

[0099] In the molding step S2, before press molding the first sheet 100A and the second sheet 100B, the dies (the concave die 41 and the convex die 42) may be warmed, or the first sheet 100A and the second sheet 100B may be warmed. By warming the dies and the like before press molding in this way, it is easy to form the desired shape.

[0100] In this embodiment, the first portion 20a and the second portion 20b are formed in the first sheet 100A and the second sheet 100B so that the conveying direction of the first sheet 100A and the second sheet 100B corresponds to the y direction shown in Figures 2 and 3, and the short side direction (direction perpendicular to the longitudinal direction) of the first sheet 100A and the second sheet 100B corresponds to the x direction shown in Figures 2 and 3.

[0101] In the molding step S2, the first portion 20a may be formed so that the entire first portion 20a bulges outward from the first sheet 100A. For example, in the case where the first sheet 100A has an inner layer 12, the entire first portion 20a may be formed in a state in which it bulges outward from the inner layer 12. The same applies to the second portion 20b.

[0102] (3) First sealing process S3 The first sealing step S3 will be described with reference to Fig. 12. The first sheet 100A on which the multiple first portions 20a have been molded by the molding step S2 and the second sheet 100B on which the multiple second portions 20b have been molded are passed through the heat-sealing device 50 while being conveyed in their longitudinal direction. The first sheet 100A and the second sheet 100B are conveyed in the heat-sealing device 50 so that the inner layers 12 of the first sheet 100A and the second sheet 100B face each other. Furthermore, the first sheet 100A and the second sheet 100B are conveyed in the heat-sealing device 50 so that the corresponding first portions 20a and second portions 20b form the container portion 20.

[0103] The first sheet 100A and the second sheet 100B are heat-sealed by the heat-sealing device 50 around the periphery of the first portion 20a (and the second portion 20b) that will become the container portion 20. As a result, the container portion 20 is formed by the first portion 20a and the second portion 20b, and the first sheet 100A and the second sheet 100B are joined together. As a result, a strip-shaped laminated sheet 100C in which a plurality of container portions 20 are formed is obtained. Since the first sheet 100A and the second sheet 100B have the paper base layer 11, in the first sealing step S3, the sheets are heat-sealed while being heated and pressurized. That is, the periphery of the first portion 20a (and the second portion 20b) that will become the container portion 20 is heated and compressed to solidify.

[0104] In the first sealing step S3, the first sheet 100A and the second sheet 100B are heat-sealed so as to secure a supply path 101 for supplying the contents 2 to the container portion 20 in the supply step S4 described below. In Fig. 12 as well, the heat-sealed area (heat-sealed area) of the laminated sheet 100C is shown by hatching. The heat-sealed area may be the same area as the area corresponding to the sealed portion 30 shown in Fig. 2 as long as the supply path 101 is secured, or may be a larger area than the sealed portion 30 as shown in Fig. 12, or may be a smaller area than the sealed portion 30 as long as the periphery of the container portion 20 is sealed.

[0105] In FIG. 12, the supply path 101, which is an unsealed region, is provided at the same position as the nozzle portion 22 in the package 1, but the supply path 101 may be at a different position from the nozzle portion 22 (for example, on the opposite side to the nozzle portion 22).

[0106] (4) Supply process S4 In the supply step S4, the contents 2 are supplied into the container portion 20 through the supply path 101 while conveying the strip-shaped laminated sheet 100C formed in the first sealing step S3 in its longitudinal direction. For example, a nozzle may be inserted into the supply path 101 shown in FIG. 12, and the contents 2 may be supplied into the container portion 20 through the nozzle. As a result, the contents 2 are accommodated in the container portion 20.

[0107] (5) Second sealing process S5 In the second sealing step S5, while conveying the strip-shaped laminated sheet 100C with the contents 2 accommodated in the container portion 20 in its longitudinal direction, at least a part of the supply path 101 is heat-sealed. This closes the supply path 101 and hermetically seals the container portion 20. The heat sealing can be performed using the heat sealing device 50 shown in FIG. 12. In this case, as in the first sealing step S3, at least a part of the supply path 101 is heat-sealed while being heated and pressurized.

[0108] (6) Opening start part forming step S6 In the opening initiation portion forming process, the opening initiation portion 4 is formed. When the opening initiation portion 4 is, for example, a notch, the notch can be formed by punching the laminated sheet 100C. When the opening initiation portion 4 is, for example, a cut line, the opening initiation portion 4 can be formed by, for example, cutting the laminated sheet 100C with a cutting blade.

[0109] (7) Separation process S7 In the separation step S7, while conveying the strip-shaped laminated sheet 100C that has been through the second sealing step S5 in its longitudinal direction, a region including the container portion 20 is separated from the laminated sheet 100C for each container portion 20 according to the desired shape of the package 1. This allows a package 1 having a desired shape to be obtained. When separating the package 1 from the laminated sheet 100C, for example, a punching process is performed on the laminated sheet 100C.

[0110] In the above manufacturing method, the opening assisting line forming step S2a and the opening start portion forming step S6 may be performed on the packaging body 1 after the separation step S7 is completed and each packaging body 1 is separated from the laminated sheet 100C. Similarly, the opening stopper portion 5 may be performed on the packaging body 1 after the separation step S7 is completed and each packaging body 1 is separated from the laminated sheet 100C.

[0111] As explained using Figures 6 to 9, in a form for manufacturing a packaging body 1 having a three-dimensional molded portion 202 in which the container portion 20 tapers toward the tip of the nozzle portion 22, the packaging body 1 can be manufactured, for example, as follows.

[0112] As illustrated in FIG. 12, when the supply path 101 is provided at the same position as the nozzle portion 22 in the packaging body 1, in the second sealing process S5, heat sealing is performed on the supply path 101, and the first sheet 100A and the second sheet 100B are molded so that the container portion 20 tapers toward the tip of the nozzle portion 22.

[0113] On the other hand, when the supply channel 101 is provided at a position different from the nozzle portion 22 (for example, the opposite side to the nozzle portion 22), the first sheet 100A and the second sheet 100B may be molded in the molding step S2 so that the first portion 20a and the second portion 20b taper toward the tip of the nozzle portion 22. Alternatively, as described above, the first sheet 100A and the second sheet 100B may be molded in the second sealing step S5 so that the container portion 20 tapers toward the tip of the nozzle portion 22.

[0114] In the above manufacturing method, the packaging body 1 can be manufactured using the first sheet 100A and the second sheet 100B made of paper. The first sheet 10A (first sheet 100A) and the second sheet 10B (second sheet 100B) of the packaging body 1 are mainly made of paper. Therefore, the amount of resin used can be reduced compared to when the first sheet 10A and the second sheet 10B are mainly made of resin (e.g., plastic). As a result, the packaging body 1 and its manufacturing method can reduce the environmental impact.

[0115] When the paper content rate of each of the first sheet 10A and the second sheet 10B is 51% or more, this further contributes to reducing the environmental load.

[0116] When the paper base layer 11 satisfies the above-mentioned condition C2, the paper base layer 11 is easy to stretch, and therefore the packaging body 1 is easy to manufacture. For example, when the first sheet 100A and the second sheet 100B are molded, such as in the molding step S2, the first sheet 100A and the second sheet 100B are unlikely to be damaged. As a result, the packaging body 1 is easy to manufacture. Because the first sheet 100A and the second sheet 100B are unlikely to be damaged, the first sheet 100A and the second sheet 100B can be effectively used.

[0117] In the case where the first sheet 10A has a circular (or elliptical) or tray-shaped three-dimensional molded portion 201, if the angle θ, the radius of curvature of the apex of the three-dimensional molded portion 201, and the ratio of the arc length to the total length of the chord are within the ranges shown as examples, the first sheet 10A, which is a paper sheet, is less likely to break when press molding is performed. Although the first sheet 10A has been described above, the same is true for the second sheet 10B.

[0118] In a configuration in which the container portion 20 has the nozzle portion 22, for example, it is possible to squeeze out the contents 2 from the container portion 20. In this case, it is easy to adjust the amount of the contents 2 to be taken out. In particular, when the width of the nozzle portion 22 in the y direction is smaller than the maximum width of the main body portion 21 in the y direction as shown in Figures 2 and 3, it is easy to take out the contents 2 by squeezing out.

[0119] As shown in Figs. 6 to 9, in a configuration in which the container portion 20 is tapered from the vicinity of the connection portion between the main body portion 21 and the nozzle portion 22 toward the tip of the nozzle portion 22, wrinkles and the like are unlikely to occur in the package 1 even if paper sheets are used as the first sheet 10A and the second sheet 10B. As a result, the appearance of the package 1 is improved. If wrinkles and the like occur, the package 1 is likely to be damaged at that portion, but since wrinkles and the like can be suppressed as described above, damage to the package 1 can be prevented. When the content 2 is a liquid seasoning (for example, soy sauce), drip pouring is also possible in a configuration in which the container portion 20 is tapered from the vicinity of the connection portion between the main body portion 21 and the nozzle portion 22 toward the tip of the nozzle portion 22.

[0120] When the contents 2 are liquid seasonings, for example, the liquid seasonings are pushed out from the package 1. In such a configuration, when the loop stiffness of the paper base layer 11 is 200 Nm or less, the contents 2 can be extracted from the package 1 while adjusting the amount of extraction by pressing the package 1 with a small pressure. In particular, when the amount of contents 2 contained in the package 1 is small, it is effective that the loop stiffness is in the above range.

[0121] Since the first sheet 10A and the second sheet 10B of the packaging body 1 are paper sheets, the packaging body 1 is likely to have a dead hold property. Therefore, for example, when the contents 2 are pushed out of the packaging body 1, the packaging body 1 is likely to maintain the pressed shape. In this case, even if the contents 2 have fluidity such as a liquid, the contents 2 can be prevented from returning to the container part 20, so that the contents 2 are unlikely to remain in the container part 20. Therefore, the contents 2 can be effectively used.

[0122] Since the package 1 is opened by breaking it, the package 1 has a function of preventing tampering with the contents 2 of the package 1.

[0123] Since paper has higher heat insulation than ordinary plastic films, when a paper molded product is welded to form a three-dimensional container, it is possible to heat the first sheet 100A and the second sheet 100B and press and solidify them, as exemplified in the first sealing step S3 and the second sealing step S5. Since paper contains air and has a low density, and further has partial density differences, if the seal width is wide, the seal strength is likely to become uneven due to uneven pressure. In contrast, by setting the seal width W to 0.5 mm or more and 5 mm or less, it is possible to ensure substantially the same seal strength in the entire seal portion 30 even if the first sheet 10A (first sheet 100A) and the second sheet 10B (second sheet 100B) which are paper sheets are used. This is thought to be because the paper base layer 11 is sealed in a state where it is crushed once.

[0124] An experimental example will be described below regarding the small seal width W. In the experimental example, paper sheets having the following layer structure B were prepared as the first sheet and the second sheet. (Layer composition B) 1st PE film / paper base layer / 2nd PE film / aluminum foil / EMAA film / 3rd PE film

[0125] In layer structure B, the first PE film, the second PE film and the EMAA film were all 20 μm thick, the paper base layer was 190 μm thick, the aluminum foil was 20 μm thick and the third PE film was 30 μm thick. Therefore, the thicknesses of the first sheet and the second sheet were 310 μm. The paper conversion rate in layer structure B was 55% by weight. The paper base layer was made of FibreForm White (basis weight: 100 g / m2) manufactured by Billerud Aktiebolag (publ). 2 ) was used.

[0126] (Experimental Example 1) In Experimental Example 1, the first sheet and the second sheet having the above-mentioned layer structure B were laminated so that the third PE film faced each other. The edges of the laminate of the first sheet and the second sheet were heat-sealed with a seal width of 10 mm. In Experimental Example 1, the first sheet and the second sheet were pressed at 1.6 tons (15.68 kN) for 3 seconds at 220°C, whereby the first sheet and the second sheet were heat-sealed.

[0127] (Experimental Example 2) In Experimental Example 2, the first sheet and the second sheet having the above-mentioned layer structure B were laminated so that the third PE film faced each other. The edges of the laminate of the first sheet and the second sheet were heat-sealed with a seal width of 1 mm using the same device as in Experimental Example 1. In Experimental Example 2, the first sheet and the second sheet were successfully heat-sealed by pressing them at 1.6 tons for 1 second at 220°C.

[0128] From Experimental Examples 1 and 2, it can be seen that more efficient sealing is possible by narrowing the seal width.

[0129] Furthermore, in Experimental Example 1, the thickness of the sealed portion was about 600 μm. That is, the thickness was the sum of the thicknesses of the first and second sheets prepared. In contrast, in Experimental Example 2, the thickness of the sealed portion was about 450 μm. When the cross section of the sealed portion was observed, in addition to the third PE film, which is the sealant layer, the second PE film and the EMAA film were also melted, and the paper base layer was also compressed and thinned. Furthermore, in the heat seal of Experimental Example 2, it was confirmed that the first sheet and the second sheet were welded with a width of 2 mm. From these facts, it is considered that in Experimental Example 2, the part with a seal width of 1 mm pressed in a molten state was crushed, and the first sheet and the second sheet were also welded by the molten resin that flowed out to the side. In this case, the influence of the variation of other materials such as the paper base layer (such as density difference in each layer) is reduced. Therefore, it was found that more stable welding can be obtained by narrowing the seal width.

[0130] Furthermore, when the seal width W of the seal portion 30 is 0.5 mm or more and 2 mm or less (for example, 1 mm), it is possible to reduce the size of the package 1. As a result, it is possible to reduce the amount of packaging material used for the package 1. Furthermore, when the seal width W is within the above range, the area to be pressed and heated during heat sealing (seal width during heat sealing) may be narrow. In this case, the heat sealing conditions can be relaxed. For example, the heat sealing time can be shortened, which improves production efficiency. Since the heat sealing conditions can be relaxed, the energy required for heat sealing can also be reduced.

[0131] The first sheet 10A and the second sheet 10B have a paper base layer 11. Since the first sheet 10A and the second sheet 10B are three-dimensionally molded, the paper base layer 11 has a tendency to stretch. Furthermore, to prevent breakage, it is possible to use a paper base material with high rigidity. A paper base material that is advantageous for the package 1 formed by three-dimensional molding is difficult to break, and therefore the package 1 is difficult to open.

[0132] In contrast, since the packaging body 1 has the opening assisting line 3, the packaging body 1 can be easily opened even if the paper base layer 11 has a tendency to easily stretch or has high rigidity as described above.

[0133] When the paper base layer 11 satisfies at least one of the conditions C1 and C2, the paper base layer 11 is not easily broken. However, since the package 1 has the opening assisting line 3, the package 1 can be easily opened.

[0134] When the first sheet 10A and the second sheet 10B satisfy condition C3, the paper base layer 11 is not easily broken. However, since the package 1 has the opening assisting line 3, the package 1 can be easily opened.

[0135] In a configuration in which both the first sheet 10A and the second sheet 10B have the paper base material layer 11, the package 1 is more difficult to open than when only one of the first sheet 10A and the second sheet 10B has the paper base material layer 11. Therefore, it is more effective in terms of facilitating opening for the package 1 to have the opening assisting line 3 as described in this embodiment.

[0136] When the opening assisting line 3 is formed by fully cutting or half-cutting the paper base layer 11 in the thickness direction, the paper base layer 11 is weakened at the position of the opening assisting line 3 in the paper base layer 11. Therefore, when the opening assisting line 3 is formed by fully cutting or half-cutting the paper base layer 11 in the thickness direction, the package 1 is easy to open.

[0137] In a configuration in which the opening initiation portion 4 is formed at the first edge portion 1a, it is easy to open the package from the first edge portion 1a where the first sheet 10A and the second sheet 10B are sealed.

[0138] When the opening assisting line 3 is formed by fully cutting or half-cutting the paper base layer 11 in the thickness direction, the paper fibers are less likely to fluff. Therefore, for example, even if the contents 2 are liquid and the liquid penetrates into the paper fibers due to capillary action, the package 1 is less likely to have a poor appearance. In particular, when the opening assisting line 3 is a laser processed line, the inner surface of the through hole or recess formed by the opening assisting line 3 in the paper base layer 11 is the surface exposed to the laser light. Therefore, at the position where the opening assisting line 3 is formed in the paper base layer, the paper fibers are even less likely to fluff. Therefore, for example, even if the contents 2 are liquid and the liquid penetrates into the paper fibers due to capillary action, the package 1 is even less likely to have a poor appearance.

[0139] If the opening assisting line 3 is a laser processed line, the opening assisting line 3 is formed on the first sheet 100A and the second sheet 100B before three-dimensional molding during the manufacturing process of the packaging body 1, or if it is formed after three-dimensional molding, it is advantageously formed in a non-three-dimensionally molded area 221 of the packaging body 1 that has not been deformed by three-dimensional molding.

[0140] When forming the opening assisting line 3, which is a laser processed line, the first sheet 100A (or the first sheet 10A) is irradiated with a laser beam focused at the formation position of the opening assisting line 3. In this case, precision in the focusing position of the laser beam is required. When the opening assisting line 3 is formed on the first sheet 100A and the second sheet 100B before three-dimensional molding as described above, or when the opening assisting line 3 is formed after three-dimensional molding, it is easy to control the focusing position when the opening assisting line 3 is formed in the non-three-dimensionally molded region 221. As a result, the opening assisting line 3 can be formed in a desired state.

[0141] 6, the opening assisting line 3 may be formed in an area that is not three-dimensionally molded, i.e., an area where the first sheet 10A and the second sheet 10B are in contact with each other, in the nozzle portion 22. In this case, even if the content 2 is liquid, the content 2 is unlikely to fly out of the opening when the package 1 is opened.

[0142] In a form in which the opening stopper 5 is formed, the tearing of the package 1 along the opening assisting line 3 is stopped at the opening stopper 5.

[0143] When the opening stopper 5 is not formed and the opening assisting line 3 is formed so as to reach the second edge 1b from the first edge 1a, the package 1 is separated into two parts at the position of the opening assisting line 3 when the package 1 is opened. For ease of explanation, the side opposite the main body 21 with respect to the opening assisting line 3 is referred to as the "tip". The package 1 is discarded after use, but if the package 1 is separated into two, the waste is likely to scatter. In particular, the tip cut off from the part of the package 1 on the main body 21 side is a small piece and is therefore likely to scatter, for example, by dropping to the floor.

[0144] On the other hand, when the tearing of the package 1 along the opening assisting line 3 is stopped by the opening stopper 5, the package 1 does not separate into two as described above. Therefore, scattering of waste is suppressed. Therefore, the configuration having the opening stopper 5 contributes to environmental beautification.

[0145] Next, Experimental Examples 3 and 4 relating to Conditions C1 and C3 will be described.

[0146] (Experimental Example 3) <Sample> In Experimental Example 3, samples α1 to α11 shown in Table 1 were prepared as paper samples. Samples α1, α3, and α5 were "FibreForm White" manufactured by Billerud Aktiebolag (publ), and samples α2 and α4 were "FibreForm Silk Plus" manufactured by Billerud. Samples α1 to α5 were papers that satisfied the above condition C2. Samples α6 to α11 were Blizzard Flexo manufactured by Oji Materials Co., Ltd. These papers did not satisfy the above condition C2. The basis weights of samples α1 to α11 were as shown in Table 1. In Table 1, when the "Coated" column is "Yes," it indicates that the sample is a coated paper that has been coated, and when it is "No," it indicates that the sample is an uncoated paper. [Table 1]

[0147] <Tearability test> A tear test in the MD and TD (or CD) directions was performed on the samples α1 to α11 in accordance with the JIS K7128-1 trouser test method. Specifically, rectangular test pieces 60 shown in Fig. 13 were cut out from the samples α1 to α11. The lengths of the long and short sides of the test pieces 60 were 150 mm and 50 mm.

[0148] A test piece 60 for a tearing test in the MD direction and a test piece 60 for a tearing test in the TD direction were cut out from each of the samples α1 to α11. In the test piece 60 for the tearing test in the MD direction, the MD direction was the long side direction, and in the test piece 60 for the tearing test in the TD direction, the TD direction was the long side direction. A 75 mm slit 62 was formed along the long side direction from the center of one of a pair of short sides 61 of the test piece 60.

[0149] FIG. 14 is a schematic diagram for explaining a test method using a tensile tester for tearing properties. First, the first portion 61a and the second portion 61b of the test piece 60, which are separated by a slit 62, are set in the tester in a state in which they are separated in opposite directions by the length of the slit. At this time, the first portion 61a and the second portion 61b are held by the gripping tool of the tester. Next, the first portion 61a and the second portion 61b are pulled in opposite directions as shown by the arrows in FIG. 14, and the tear strength is calculated using the average force required to completely tear the test piece 60 in the long side direction.

[0150] In Experimental Example 3, an Autograph AG-IS manufactured by Shimadzu Corporation was used as a tensile tester. The test speed was 500 mm / min. When calculating the tear strength in the MD direction, five test pieces 60 were prepared for each of the samples α1 to α11, and the average value of the tear strength calculated by measuring each test piece 60 was adopted as the tear strength in the MD direction of each of the samples α1 to α11. When calculating the tear strength in the TD direction, five test pieces 60 were prepared for each of the samples α1 to α11, and the average value of the tear strength calculated by measuring each test piece 60 was adopted as the tear strength in the TD direction of each of the samples α1 to α11.

[0151] <Test Results> The test results are shown in Table 2. [Table 2]

[0152] From the results in Table 2 above, it can be seen that samples α1 to α5, which are more stretchable than samples α6 to α11, are more difficult to tear in both the MD and TD than samples α6 to α11. In the tear test of samples α1 to α5, the test pieces 60 could be cut linearly in the MD, but were cut obliquely in the TD.

[0153] (Experimental Example 4) <Sample> In Experimental Example 4, samples β1 to β3 were prepared.

[0154] (1) Sample β1 As sample β1, a laminate sheet having the following layer structure was prepared. Paper base layer / PE film / barrier layer / EMAA film

[0155] The paper base layer was sample α1 described in Experimental Example 3. The PE film was a stretched PE film with a thickness of 20 μm. The barrier layer was an aluminum foil with a thickness of 20 μm. The thickness of the EMAA film was 25 mm.

[0156] (2) Sample β2 A laminated sheet having the following layer structure was prepared as sample β2. Paper base layer / PE film / barrier layer / EMAA film / LLDPE film

[0157] Sample β2 had the same structure as sample β1, except that it further had an LLDPE film. In other words, sample β2 was a sample in which an LLDPE film was further laminated on the EMAA film of sample β1. The thickness of the LLDPE film was 20 μm.

[0158] (4) Sample β3) As sample β3, a laminate sheet having the following layer structure was prepared. Paper base layer / 1st PE layer / EVOH layer / 2nd PE layer / 3rd PE layer

[0159] The paper base layer was G Montblanc Art N manufactured by Nippon Paper Industries Co., Ltd. The basis weight of the paper base layer was 79.1 / m 2The portion composed of the first PE layer, the EVOH layer, and the second PE layer was a coextruded film, and the first PE layer, the EVOH layer, and the second PE layer were layers composed of PE, EVOH, and PE. The thickness of the first PE layer was 13 μm. The thickness of the EVOH layer was 6 μm. The thickness of the second PE layer was 25 μm. The third PE layer was a layer formed by extruding PE. The thickness of the third PE layer was 15 μm.

[0160] (A) Experimental Example 4-1 As Experimental Example 4-1, the tear strength in the MD and TD of Samples β1 to β3 were determined in the same manner as in Experimental Example 3. The tear test method was the same as in Experimental Example 3. The results of Experimental Example 4-1 are shown in Table 3. [Table 3]

[0161] Samples β1 to β3 were laminated sheets having the layer structure described above. Sample β3 had a paper base layer that was less stretchable than the paper base layers used in samples β1 and β2. From the results in Table 3, it can be seen that samples β1 and β2, which have paper base layers that are more stretchable, are less likely to tear. Sample β3 could be cut linearly in both the MD and TD directions, while samples β1 and β2 had poor linear cut properties in both the MD and TD directions, and in particular, the linear cut properties were significantly poor in the TD direction.

[0162] (B) Experimental Example 4-2 In Experimental Example 4-2, a tear test was carried out on Samples β1 to β3 in the same manner as in Experimental Example 4-1, except that a test piece 60A shown in Fig. 15 was used. The test piece 60A was the same as the test piece 60, except that a laser-processed line 63 was formed in the long side direction of the test piece 60A. In Fig. 15, the laser-processed line 63 is shown by a dashed line to distinguish it from the slit 62.

[0163] The laser processing line 63 was formed so as to completely penetrate the paper base layer of the samples β1 to β3. A continuous laser beam with a wavelength of 10.6 μm was used for the laser processing. The output conditions for the laser processing were as follows. [Output conditions] Head: Carbon dioxide laser head (product name: ML-Z9500, manufactured by Keyence Corporation) ·Wavelength: 10.6μm Laser average power: 68W Scanning speed: 150m / min Spot diameter: 2μm The laser light was focused on the paper base layer, and the laser processing line was formed from the center position of the short side 61 of the test piece 60A shown in FIG. 15 along the long side to the opposite short side. FIG. 15 shows a case where a part of the laser processing line 63 overlaps with the slit 62. The laser processing conditions were the same for samples β1 to β3. The experiment of Experimental Example 4-2 was carried out on the test piece 60A for the MD tear test and the TD tear test. The test results are shown in Table 4. [Table 4]

[0164] From the results of Tables 3 and 4, the tearability of samples β1 to β3 was improved in both the MD and TD directions by applying laser processing. However, for sample β3, which uses a paper base layer that is relatively hard to stretch, a certain level of ease of tearing was achieved even without laser processing, so the effect of laser processing was small.

[0165] In contrast, it can be seen that the tearability of samples β1 and β2, which use stretchable paper as the paper base layer, is significantly improved by forming a laser processing line. Furthermore, the straight cutability of samples β1 and β2 is also improved.

[0166] From the above results, it can be seen that the ease of opening is improved by forming the opening assisting line 3 in the package 1. Furthermore, it is easy to cut in a straight line when opening.

[0167] (Variation 1)

[0168] For example, as shown in Figures 16 and 17, the nozzle portion 22 may have a protrusion 23a and a protrusion 23b. Figure 16 is a plan view for explaining a first modified example of the packaging body. Figure 17 is an end view of the packaging body taken along line XVII-XVII in Figure 16. The hatching in Figure 16 is for clearly indicating the seal portion 30.

[0169] The protrusions 23a and 23b are portions of the outer wall of the nozzle portion 22 that are bent outward. The protrusions 23a and 23b may be, for example, ruled lines or ribs. As shown in FIG. 16, the protrusions 23a and 23b extend from the vicinity of the connection between the main body portion 21 and the nozzle portion 22 toward the tip of the nozzle portion 22. In FIG. 16, the protrusions 23a and 23b extend in the x direction (corresponding to the direction in which the contents 2 are taken out). The protrusions 23a are provided on the first sheet 10A, and the protrusions 23b are provided on the second sheet 10B.

[0170] When removing the contents 2 from the package 1, a portion of the nozzle portion 22 is broken along the opening assisting line 3 to form a removal opening. When the above-mentioned convex portions 23a and 23b are provided on the nozzle portion 22, the nozzle portion 22 is easily opened in the z direction by pressing the nozzle portion 22 from both sides of the nozzle portion 22 in the y direction. Therefore, the contents 2 can be easily removed from the removal opening through the nozzle portion 22. Therefore, the convex portions 23a and 23b are portions that contribute to improving the openability of the package.

[0171] The protrusions 23a and 23b can be formed in the first sheet 100A and the second sheet 100B in the molding step S2.

[0172] 16 and 17 show an example in which the nozzle portion 22 has the protrusions 23a and 23b. However, the nozzle portion 22 does not necessarily have to have the protrusions 23a or 23b.

[0173] (Variation 2) The packaging body 1 may be a packaging body having a rectangular (or strip-shaped) shape in plan view, as shown in Fig. 18. Fig. 18 is a diagram for explaining a packaging body according to modified example 2. The packaging body 1 according to modified example 2 is referred to as packaging body 1A. In packaging body 1A, as shown in Fig. 18, the main body portion 21 is also rectangular when viewed from the z direction, and the container portion 20 may be bottle-shaped. In packaging body 1, the three-dimensional molded portion 201 is formed, for example, in the shape of a tray.

[0174] Like the packaging body 1A, the outer shape of the packaging body 1A is rectangular, while the container portion 20 may have an egg-shaped main body portion 21 and a nozzle portion 22, similar to the packaging body 1. The packaging body 1A may also have a three-dimensionally molded portion 202 that tapers from the main body portion 21 toward the tip of the nozzle portion 22. As in the case of the packaging body 1, the opening assisting line 3 may be formed from the first edge portion 1a toward the second edge portion 1b so as to cross the non-three-dimensionally molded region 221.

[0175] Second embodiment 19 is a schematic diagram of a multiple packaging body according to the second embodiment. The multiple packaging body 1B is a packaging body in which multiple packaging bodies 1A are connected. Each of the multiple packaging bodies 1A in the multiple packaging body 1B is the packaging body 1A described in the modified example 2. Therefore, a description of each packaging body 1A will be omitted.

[0176] In two adjacent packages 1A, a first edge 1a of one package 1A is connected to a second edge 1b of the other package. A cutting assist line 6 for separating the two packages 1A is formed at the boundary between two adjacent packages 1A in the multiple packages 1A. The cutting assist line 6 is formed along the x-axis direction from edge to edge of the multiple package. The cutting assist line 6 is formed at a corresponding position on the first sheet 10A and the second sheet 10B. The cutting assist line 6 may be formed in the same manner as the opening assist line 3.

[0177] In the multiple packaging bodies 1A that the multiple packaging body 1B has, the first sheet 10A is a common sheet, and the second sheet 10B (not shown in FIG. 19) is also a common sheet.

[0178] The multiple package 1B is manufactured, for example, as follows. First, the steps up to the second sealing step S5 described in the manufacturing method of the package 1 are carried out. After the second sealing step S5 is carried out, and before the separating step S6 is carried out, a step of forming an auxiliary cutting line 6 at the boundary between the multiple packages 1A is carried out. Then, in the separating step S6, the multiple packages 1A contained in the multiple package 1B to be manufactured are separated into one set, thereby manufacturing the multiple package 1B.

[0179] The multiple packaging unit 1B has a plurality of packaging units 1A. Each packaging unit 1A separated from the multiple packaging unit 1B is the same packaging unit 1A as in the modified example 2. The packaging unit 1A in the modified example 2 has the same effects as the packaging unit 1. Therefore, the multiple packaging unit 1B also has the same effects as the packaging unit 1.

[0180] The embodiment of the package according to one aspect of the present invention has been described above. However, the present invention is not limited to the above embodiment, and is intended to include the scope indicated by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0181] The paper base layer may be constructed by laminating different types of paper or the same type of paper together, i.e., the paper base layer may be a laminate of multiple papers.

[0182] The second sheet may not have the second three-dimensional molded portion described in the above embodiment. In this case, the second sheet is a flat sheet. Even in this case, the first three-dimensional molded portion formed on the first sheet and the second sheet form a storage space for storing the contents. That is, the first portion formed on the first sheet and the second sheet form a container portion.

[0183] As described above, when the second sheet is a flat sheet, the second sheet may be a resin sheet. Even in this case, the first sheet is a paper sheet. Therefore, it is possible to reduce the environmental impact more than when the main material of both the first sheet and the second sheet is resin. When the second sheet is the above-mentioned resin sheet, for example, if a transparent sheet is used as the resin sheet, the user can see the contents. In this case, the user can easily check the remaining amount of the contents.

[0184] The second sheet does not have to have an opening assisting line formed thereon. Even in this case, the opening assisting line is formed in the first sheet, so the ease of opening is improved. In particular, when the second sheet is a resin sheet as described above, the second sheet does not have to have an opening assisting line formed thereon.

[0185] When the first sheet and the second sheet have an inner layer 12 in addition to the paper base layer as shown in Fig. 5, a window (opening) can be provided in part of the paper base layer to allow the contents to be viewed from outside the package. Such a window may be formed in one of the first sheet and the second sheet.

[0186] The nozzle portion is not limited to a three-dimensional nozzle portion as shown in FIG. 6 and FIG. 7, and may be a flat nozzle portion. Even in this case, the nozzle portion area of ​​the first sheet and the second sheet is a flat area and an unsealed area. Even in such a form, for example, when pushing out the contents, the unsealed area expands, so that the contents can be poured out. The cross-sectional shape of the nozzle portion depends on the type of contents and the method of removing the contents from the package, and the container portion may not have a nozzle portion (passage portion). When the container portion has a passage portion, the shape of the passage portion may be a shape according to the method of removing the contents.

[0187] The first sheet and the second sheet do not have to be symmetrical with respect to their joining surface. The first sheet and the second sheet may have different paper conversion rates.

[0188] The sealed portion of the package is formed by heat sealing the first sheet and the second sheet. However, the method of forming the sealed portion is not limited to heat sealing. The method of forming the sealed portion may be one that corresponds to the contents. For example, depending on the contents, a method using an adhesive or a method using a hot melt may be used.

[0189] From the viewpoint of making discoloration of the package due to the contents less noticeable, a form in which a printed layer having a function of making discoloration of the package less noticeable is provided on the first sheet or the second sheet has been exemplified. From the viewpoint of making discoloration of the package due to the contents less noticeable in this way, colored paper may be used for the paper base layer, or functions such as water resistance and oil resistance may be imparted to the paper base layer.

[0190] The above-described embodiments and modifications may be combined as appropriate without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0191] 1, 1A...packaging body, 1B...multiple packaging body, 1a...first edge, 1b...second edge, 2...contents, 3...opening assistance line, 3a...first end, 3b...second end, 4...opening start portion, 5...opening stop portion, 10...sheet, 10A...first sheet, 10B...second sheet, 20...container portion, 23a, 23b...convex portion, 30...seal portion, 201...three-dimensional molded portion (first three-dimensional molded portion or second three-dimensional molded portion).

Claims

1. A packaging body having a first sheet and a second sheet disposed opposite the first sheet along a first direction, and having a first edge and a second edge located opposite the first edge in a second direction perpendicular to the first direction, a container portion configured by the first sheet and the second sheet and configured to accommodate contents; a seal portion in which the periphery of the container portion is sealed in the first sheet and the second sheet when viewed from the first direction, and which hermetically seals the container portion; Equipped with The first sheet has a first paper base layer and a first three-dimensional molded portion that constitutes at least a part of the container portion and bulges outward in the first sheet, an opening assist line for opening the container portion sealed by the seal portion is formed at least on the first sheet from the first edge portion to the second edge portion; An opening start portion connected to the opening assist line is formed on the first edge portion. packaging.

2. The tear strength in one of the two directions perpendicular to the first direction of the first paper base layer is 1.5 N or more and 11 N or less, and the tear strength in the other direction is 2.9 N or more and 10 N or less. The package of claim 1.

3. The tear strength of the first sheet in one of two directions perpendicular to the first direction is 4.3 N or more and 11.5 N or less, and the tear strength in the other direction is 8 N or more and 20 N or less. The package of claim 1.

4. The elongation rate of the first paper base layer in each of two directions perpendicular to the first direction is 3% or more. The package of claim 1.

5. The second sheet has a second paper base layer and a second three-dimensional molded portion that bulges outward from the second sheet and that constitutes at least a portion of the container portion together with the first three-dimensional molded portion. The opening assisting line is formed on the first sheet and the second sheet. The packaging body according to any one of claims 1 to 4.

6. The tear strength of the second paper base layer in one of two directions perpendicular to the first direction is 1.5 N or more and 11 N or less, and the tear strength in the other direction is 2.9 N or more and 10 N or less. The package according to claim 5.

7. The tear strength of the second sheet in one of two directions perpendicular to the first direction is 4.3 N or more and 11.5 N or less, and the tear strength in the other direction is 8 N or more and 20 N or less. The package according to claim 5.

8. The elongation rate of the second paper base layer in each of two directions perpendicular to the first direction is 3% or more. The package according to claim 5.

9. A first end of the opening assisting line is connected to the opening initiation portion, An opening stopper for stopping opening along the opening assisting line is formed at least in the first sheet between a second end portion located opposite to the first end portion of the opening assisting line and the second edge portion. The package of claim 1.

10. The container portion is A main body portion for accommodating the contents; a passage portion through which the contents pass when the contents are taken out from the main body portion to the outside; having The opening assisting line is formed so as to cross the passage portion. The package of claim 1.

11. The passage portion has a convex portion formed by bending a part of an outer wall of the passage portion outward. The package of claim 10.

12. The size of a cross section of the passage portion perpendicular to the direction in which the contents are taken out decreases from the main body portion toward the end of the passage portion. The package of claim 10.

13. A plurality of the packaging bodies according to claim 1 are provided, the first sheet and the second sheet are common sheets among a plurality of the packaging bodies, A cutting assist line 6 is formed along the boundary between two adjacent packages among the plurality of packages. Multiple packaging.

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