Paper container

Abstract

To obtain a paper container having excellent aesthetics while ensuring transparency and tear strength.SOLUTION: A paper container 10 of the present invention comprises: a first surface member 11; a second surface member 12 that is stacked on the first surface member 11 and forms a storage space with the first surface member 11; folded edges 14, 15 that are formed by folding a single sheet of paper base material and that form the periphery of the first surface member 11; and a transparent portion 20 in which a transparent material has been applied to at least a portion of the first surface member 11. The transparent portion 20 of the paper container 10 comprises gradation portions 21, 22 in an area within a predetermined distance from the folded edges 14, 15, in which the amount of transparent material applied per unit area decreases as the area comes closer to the folded edges 14, 15.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] An embodiment of the present invention relates to a paper container. [Background technology]

[0002] Plastic films such as polyethylene terephthalate (PET) film place a large burden on the environment during production and disposal, so paper containers using a paper base material are sometimes used instead of plastic films for containers such as clear folders for storing documents and packaging bags for packaging food and daily necessities.

[0003] In the case of paper containers, a transparent material may be applied to the paper base material constituting the container to make at least a portion of the container transparent so that the contents of the container can be seen from the outside.

[0004] However, since the tear strength of the area to which the transparent material is applied decreases when folded, it may be difficult to form a container using a paper base material to which a transparent material is applied, depending on the shape of the container.

[0005] In response to this, a clear holder has been proposed in which a transparent material is applied to at least a part of the paper base material, and by not applying the transparent material near the folded edge, a decrease in tear strength at the folded edge is suppressed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-91168 Summary of the Invention [Problem to be solved by the invention]

[0007] However, if the transparent material is applied to other parts without applying it near the folded edges, as in Patent Document 1 above, conspicuous opaque areas may be formed along the folded edges of the paper container, which may detract from the aesthetic appeal of the paper container.

[0008] Therefore, an object of the present invention is to provide a paper container that ensures transparency and tear strength while also having excellent aesthetic appeal. [Means for solving the problem]

[0009] The present invention includes the embodiments set forth below.

[0010] [1] A paper container comprising a first surface member, a second surface member that is stacked on the first surface member and forms a storage space between the first surface member and a folded edge that is formed by folding a single sheet of paper base material and that forms the periphery of the first surface member, and a transparent portion in which a transparent material is applied to at least a part of the first surface member, wherein the transparent portion has a gradation portion in an area within a predetermined distance from the folded edge, in which the amount of transparent material applied per unit area decreases the closer the transparent portion is to the folded edge.

[0011] [2] The paper container described in [1] above, wherein the gradation portion is formed by arranging a plurality of application portions of a predetermined shape formed by applying a transparent material, and at least one of the size and density of the application portions decreases toward the folded edge.

[0012] [3] A paper container as described in [1] or [2] above, wherein the folded edge forms the periphery of the first surface member and the second surface member, and at least a portion of the second surface member is provided with a second transparent portion made transparent by applying a transparent material, and the second transparent portion is provided with a second gradation portion in an area within a predetermined distance from the folded edge, in which the amount of transparent material applied per unit area decreases the closer it is to the folded edge.

[0013] [4] The paper container described in [1] or [2] above, wherein the folded edge forms the periphery of the first surface member and the second surface member, the gradation portion is provided on the first surface member and the second surface member across the folded edge, and the amount of transparent material applied per unit area on the second surface member decreases the further away from the folded edge.

[0014] [5] The paper container according to any one of the above [1] to [4], wherein areas where the transparent material is applied and areas where the transparent material is not applied are provided alternately on the folded side.

[0015] [6] The paper container according to any one of the above [1] to [4], wherein no transparent material is applied to the folded side.

[0016] [7] The paper container described in any one of [1] to [6] above, wherein the storage space is rectangular and has the folded edge, a second folded edge adjacent to the folded edge and closing the storage space, and two open edges that open the storage space.

[0017] [8] A paper container as described in [1] above, comprising: a bag-shaped bag body having a storage space formed therein with an opening downward; and a lower flap protruding downward from the lower edge of the bag body, wherein the bag body comprises the first surface member, the second surface member, an upper flap folded back from the upper edge of the first surface member to overlap the outside of the second surface member and close the upper side of the storage space, a hanging hole penetrating the first surface member, the second surface member, and the upper flap, a first adhesive portion adhering the upper flap to the second surface member, an adhesive hole provided in the portion of the second surface member where the upper flap overlaps, and a second adhesive portion adhering the upper flap to the first surface member through the adhesive hole.

[0018] [9] The paper container described in [8] above, wherein the hanging hole and the adhesive hole are provided separately in the second surface member.

[0019]

[10] The paper container described in [8] or [9] above, wherein a plurality of the adhesive holes are provided at intervals in the left-right direction.

[0020]

[11] The paper container according to any one of the above [8] to

[10] , wherein the adhesive holes are provided on both the left and right sides of the hanging hole. Effect of the Invention

[0021] By providing the paper container according to the present invention with the above-mentioned configuration, it is possible to obtain a paper container that is aesthetically pleasing while ensuring transparency and tear strength. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a plan view of a paper container according to a first embodiment of the present invention. [Diagram 2] Exploded view of the paper container in Figure 1 [Diagram 3] A development view of a paper container according to a second embodiment of the present invention. [Figure 4] A plan view of a paper container according to a third embodiment of the present invention. [Diagram 5] Exploded view of the paper container in Figure 4 [Figure 6] FIG. 2 is a development view of a paper container according to a modified example of the present invention. [Figure 7] A front view of a paper container according to a modified example of the third embodiment of the present invention. [Figure 8] Rear view of the paper container in Figure 7 [Figure 9] IX-IX cross section of Fig. 7 [Figure 10] Exploded view of the paper container in Figure 7 [Figure 11] FIG. 8 is a rear view showing the state before the upper side of the storage space is closed by the upper flap in the paper container of FIG. [Figure 12] A rear view of a paper container according to another modified example of the third embodiment of the present invention. [Figure 13] A rear view of a paper container according to another modified example of the third embodiment of the present invention. [Figure 14] A rear view of a paper container according to another modified example of the third embodiment of the present invention. [Figure 15] A rear view of a paper container according to another modified example of the third embodiment of the present invention. [Figure 16] A rear view of a paper container according to another modified example of the third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Note that in the drawings, the sizes of components may be exaggerated for the sake of explanation.

[0024] The following embodiments are illustrative and the scope of the invention is not limited thereto. The following embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The following embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims.

[0025] 1. First embodiment As shown in Figs. 1 and 2, in this embodiment, a paper container 10 is a clear holder.

[0026] (1) Configuration of the paper container 10 The paper container 10 comprises a rectangular first surface member 11, a second surface member 12 that is provided in approximately the same shape as the first surface member 11 and is provided overlapping the first surface member 11, and an adhesive piece 13. The paper container 10 is formed by folding a single sheet of paper member that has been cut into a predetermined shape as shown in FIG.

[0027] The first surface member 11 and the second surface member 12 are connected by a first folded side 14 formed by folding a paper base material. In other words, the first folded side 14 constitutes the periphery of the first surface member 11 and the second surface member 12.

[0028] The adhesive piece 13 is connected to the first surface member 11 at a second folded edge 15 formed by folding the paper base material. The second folded edge 15 constitutes the periphery of the first surface member 11 and the adhesive piece 13. The second folded edge 15 is an edge adjacent to the first folded edge 14.

[0029] The adhesive piece 13 is folded back from the second folded side 15 so as to overlap the outside of the second surface member 12, and is fixed to the outside of the second surface member 12 by an adhesive or the like.

[0030] In the paper container 10, a rectangular storage space formed between the first surface member 11 and the second surface member 12 is closed at the first folded side 14 and the adjacent second folded side 15, and is open at two open sides 16, 17 facing the first folded side 14 and the second folded side 15. The paper container 10 accommodates contents in the storage space by inserting the contents from the open sides 16, 17.

[0031] The paper container 10 has a first transparent portion 20 formed by applying a transparent material to at least a part of the first surface member 11. Also, a second transparent portion 30 formed by applying a transparent material to at least a part of the second surface member 12.

[0032] The paper base material used for the paper container 10 is preferably a commonly used paper whose main component is plant-derived pulp, such as bleached or unbleached kraft paper, wood-free paper, or one-sided glazed paper.

[0033] In addition, examples of the transparent material that can be suitably used for the paper container 10 include UV-curable transparent materials, rosin-based water-based transparent materials, petroleum-based hydrocarbon transparent materials, polyester-based transparent materials, urethane-based transparent materials, nitrocellulose-based transparent materials, acrylic-based transparent materials, etc., and these may be used alone or in combination of two or more types.

[0034] (2) First transparent portion 20 and second transparent portion 30 The first transparent portion 20 and the second transparent portion 30 have a higher transparency than the portion of the paper container 10 to which the transparent material is not applied.

[0035] The first transparent portion 20 and the second transparent portion 30 may be formed on at least a part of the first surface member 11 and the second surface member 12, but it is preferable that they are provided on substantially the entire surface of the first surface member 11 and the second surface member 12 in order to improve visibility of the contents in the storage space.

[0036] Moreover, in order to improve the visibility of the contents, the opacity of the transparent portion 20 is preferably 65%±10% according to the opacity test method specified in JIS P 8149:2000.

[0037] 2, in the first transparent portion 20, a first gradation portion 21 is formed in an area that is within a predetermined distance from the first folded side 14. In other words, assuming a boundary line 21a that is a predetermined distance away from the first folded side 14 and parallel to the first folded side 14, the area between the boundary line 21a and the first folded side 14 is the first gradation portion 21.

[0038] In addition, the first transparent portion 20 has a third gradation portion 22 formed in an area that is within a predetermined range of distance from the second folded side 15. In other words, the area between the second folded side 15 and a boundary line 22a that is a predetermined length away from the second folded side 15 and parallel to the second folded side 15 is the third gradation portion 22.

[0039] The second transparent portion 30 is the area within a predetermined range of distance from the first folded side 14, that is, the area between the first folded side 14 and a boundary line 31a that is a predetermined distance away from the first folded side 14 and parallel to the first folded side 14, and the first folded side 14, which is the second gradation portion 31.

[0040] It is preferable that the width of the first gradation portion 21 (the distance from the first folded side 14 to the boundary line 21a), the width of the third gradation portion 22 (the distance from the second folded side 15 to the boundary line 22a), and the second gradation portion 31 (the distance from the first folded side 14 to the boundary line 31a) be greater than or equal to 2 mm and less than or equal to 10 mm.

[0041] In the first transparent portion 20, the transparent material is applied without any gaps in an area other than the first gradation portion 21 and the third gradation portion 22. In the second transparent portion 30, the transparent material is applied without any gaps in an area other than the second gradation portion 31.

[0042] In the first gradation portion 21, the amount of transparent material applied per unit area decreases toward the first bent side 14.

[0043] Specifically, a plurality of application sections 21b having a predetermined shape (for example, a circular shape) formed by applying a transparent material are provided in the first gradation section 21. The application sections 21b are provided at a constant density (the number of application sections 21b provided per unit area is constant) in the first gradation section 21, and the size becomes smaller the closer to the first bent side 14 from the boundary line 21a (the area of ​​the application sections 21b becomes narrower).

[0044] As a result, in the first gradation portion 21, the density (area of ​​the non-coated portions 21c per unit area) of the portions 21c to which the transparent material is not applied (these portions are also called non-coated portions) increases toward the first folded side 14 from the boundary line 21a. In this embodiment, the coated portions 21b and the non-coated portions 21c are provided alternately on the first folded side 14.

[0045] In the third gradation section 22, similarly to the first gradation section 21, a plurality of applied sections 22b formed by applying the transparent material are provided at a constant density and are smaller in size from the boundary line 22a to the second folded side 15. As a result, in the third gradation section 22, the density of the non-applied sections 22c to which the transparent material is not applied increases as the third gradation section 22 approaches from the boundary line 22a to the second folded side 15, and the amount of transparent material applied per unit area decreases. In this embodiment, the applied sections 22b and the non-applied sections 22c are provided alternately on the second folded side 15.

[0046] 2, the third gradation portion 22 may be provided in a region adjacent to the second folded edge 15 of the adhesive piece 13, beyond the first surface member 11 and beyond the second folded edge 15. In the portion of the third gradation portion 22 provided in the adhesive piece 13, the amount of transparent material applied per unit area decreases with increasing distance from the second folded edge 15.

[0047] In other words, assuming a boundary line 22d that is parallel to the second folded edge 15 and a predetermined distance away from the second folded edge 15 toward the adhesive piece 13, a third gradation section 22 is provided between the boundary line 22a and the boundary line 22d, and the amount of transparent material applied per unit area decreases the closer to the boundary line 22d from the boundary line 22a.

[0048] In the second gradation section 31, similarly to the first gradation section 21, a plurality of applied sections 31b formed by applying the transparent material are provided at a constant density and are smaller in size from the boundary line 31a toward the first folded side 14. As a result, in the second gradation section 31, the density of non-applied sections 31c to which no transparent material is applied increases toward the first folded side 14 from the boundary line 31a, and the amount of transparent material applied per unit area decreases.

[0049] The second gradation portion 31 is adjacent to the first gradation portion 21 at the first folded side 14. As described above, the applied portions 21b and the non-applied portions 21c are alternately provided on the first folded side 14. The applied portions 31b provided in the second gradation portion 31 are larger than the applied portions 21b provided on the first folded side 14.

[0050] As a result, the applied portion 31b becomes gradually smaller (the amount of transparent material applied gradually decreases) from the boundary line 31a of the second gradation portion 31 toward the first bent side 14, and is smallest in the applied portion 21b on the bent side 14. The applied portion 21b becomes gradually larger (the amount of transparent material applied gradually increases) from the bent side 14 toward the boundary line 21a of the first gradation portion 21.

[0051] The rate of change in the amount of transparent material applied in the gradation portions 21, 22, and 31 can be set arbitrarily, for example, to 20% to 100%. Preferably, it is 20% to 70%. By setting the rate of change to 20% or more, it is possible to effectively suppress a decrease in tear strength at the folded edge. By setting the rate of change to 70% or less, it is possible to enhance the sense of unity of the entire first transparent portion 20 and create an excellent aesthetic impression. The rate of change in the amount of transparent material applied is a value obtained by dividing the difference between the amount of transparent material applied on the boundary line of the gradation portion and the amount of transparent material applied on the folded edge by the amount of transparent material applied on the boundary line.

[0052] In this embodiment, the processing amount of transparent material applied to the first transparent portion 20 and the second transparent portion 30 (the amount of transparent material applied per unit area at the location where the transparent material is applied) is constant, and the amount of transparent material applied per unit area is changed by changing the density of the applied and non-applied portions in the first gradation portion 21, the third gradation portion 22, and the second gradation portion 31.

[0053] (3) Effects In the paper container 10 of this embodiment, a first gradation portion 21 is provided near the first folded edge 14 of the first transparent portion 20, and a third gradation portion 22 is provided near the second folded edge 15. This makes it difficult for opaque areas to form near the first folded edge 14 and the second folded edge 15, improving the sense of unity of the entire first transparent portion 20 and creating an excellent aesthetic impression.

[0054] Furthermore, since the amount of transparent material applied per unit area decreases toward the first folded edge 14 and the second folded edge 15, a decrease in tear strength of the first folded edge 14 and the second folded edge 15 can be suppressed.

[0055] In the paper container 10 of this embodiment, a second gradation portion 31 is provided near the first folded edge 14 of the second transparent portion 30 provided on the second surface member 12, making it difficult for an opaque area to be formed near the first folded edge 14, enhancing the sense of unity of the entire second transparent portion 30 and creating an excellent aesthetic impression.

[0056] In the paper container 10 of this embodiment, coated sections 21b, 22b and non-coated sections 21c, 22c are alternately arranged on the first folded edge 14 and the second folded edge 15, so that opaque streaks are less likely to form along the first folded edge 14 and the second folded edge 15, resulting in an aesthetically pleasing product.

[0057] In addition, the non-application portions 21c, 22c prevent the application portions 21b, 22b from being continuously arranged along the first folded edge 14 and the second folded edge 15, thereby suppressing a decrease in the tear strength of the first folded edge 14 and the second folded edge 15.

[0058] 2. Second embodiment Next, a second embodiment will be described with reference to Fig. 3. Note that configurations common to the first embodiment will be denoted by the same reference numerals as those shown in Figs. 1 and 2, and descriptions thereof will be omitted.

[0059] The paper container 200 of this embodiment differs from the first embodiment described above in that no transparent material is applied to the second surface member 12. The paper base material and transparent material used in the paper container 200 can be the same paper and resin as those in the first embodiment.

[0060] 3, the gradation portion 221 provided in the transparent portion 220 is provided in a region adjacent to the first folded side 14 of the second surface member 12, beyond the first folded side 14 from the first surface member 11. In the portion of the gradation portion 221 provided in the second surface member 12, the amount of transparent material applied per unit area decreases with increasing distance from the first folded side 14.

[0061] In other words, assuming a boundary line 221d that is a predetermined length away from the first folded edge 14 toward the second surface member 12 and parallel to the first folded edge 14, a gradation portion 221 is provided between the boundary line 221a and the boundary line 221d, and the amount of transparent material applied per unit area decreases the closer to the boundary line 221d from the boundary line 221a.

[0062] The rate of change in the amount of transparent material applied in the gradation portion 221 can be set arbitrarily, for example, between 20% and 100%.

[0063] In this embodiment, the gradation portion 221 is also provided near the first folded edge 14 of the second surface member 12, so that even if processing errors occur when folding a single sheet of paper base material to form the first folded edge 14, the application portion 221b to which the transparent material has been applied can be placed on or immediately adjacent to the first folded edge 14, making it easier to manufacture the paper container 200.

[0064] 3. Third embodiment Next, a third embodiment will be described with reference to Fig. 4 and Fig. 5. In this embodiment, the up-down direction and the left-right direction refer to the directions when the flap 302 is placed on the upper side and the first surface member 311 faces forward as shown in Fig. 4. (1) Configuration of the paper container 300 The paper container 300 of this embodiment is a packaging bag including a bag-shaped bag body 301 having a storage space for storing contents, and a flap 302 protruding from the edge of the bag body 301. The paper container 300 is formed by folding a single sheet of paper material cut into a predetermined shape as shown in FIG.

[0065] The bag body 301 constituting the paper container 300 comprises a rectangular first surface member 311, a second surface member 312 provided on top of the first surface member 311, and an adhesive piece 313. In the bag body 301, a storage space is formed between the first surface member 311 and the second surface member 312, and an opening communicating with the storage space is formed on the open side.

[0066] The second surface member 312 includes a first folded portion 312a folded back from a folded side 314 constituting the left edge of the first surface member 311, and a second folded portion 312b folded back from a folded side 315 constituting the right edge of the first surface member 311. The tip of the first folded portion 312a is overlapped with the tip of the second folded portion 312b and adhered to the second folded portion 312b.

[0067] The adhesive piece 313 is formed by folding back a third bent side 316 that constitutes the lower edge of the first surface member 311. The third bent side 316 is adjacent to the first bent side 314 and the second bent side 315.

[0068] The adhesive piece 313 is folded back from the third folded side 316 so as to overlap the outside of the second surface member 312, and is fixed to the outside of the second surface member 312 by an adhesive or the like.

[0069] The bag body 301 has a storage space formed between the first surface member 311 and the second surface member 312 closed at the first folded edge 314, the second folded edge 315, and the third folded edge 316, and opens at the open edge 317 opposite the third folded edge 316. The contents are inserted from the open edge 317 to store the contents in the storage space.

[0070] The flap 302 is connected to the first surface member 311 at the open side 317. An adhesive tape 303 with release paper is provided along the left-right direction at the tip of the flap 302. After the release paper of the adhesive tape 303 is peeled off, the flap 302 is folded back from the open side 317 of the first surface member 311 so as to overlap the outside of the second surface member 312, and is adhered to the outside of the second surface member 312 to close the opening of the storage space.

[0071] In such a paper container 300, a transparent portion 320 is formed by applying a transparent material to at least a part of the first surface member 311.

[0072] The paper base material and transparent material used in the paper container 300 of this embodiment can be the same paper and resin as those in the first embodiment.

[0073] (2) Transparent part 320 The transparent portion 320 has a higher transparency than the portion of the paper container 300 to which the transparent material is not applied.

[0074] In this embodiment, the transparent portion 320 is provided in the center in the up-down direction of the first surface member 311 across the entire left-right direction. Areas to which no transparent material is applied are provided in the upper and lower parts of the first surface member 311. Note that, although the transparent portion 320 is provided in a part of the first surface member 311 in this embodiment, it may be provided over the entire first surface member 311.

[0075] The opacity of the transparent portion 320 is preferably 55% or more and 75% or less in order to improve the visibility of the contents.

[0076] 4 and 5, the transparent portion 320 has gradation portions 321, 331 formed in regions that are within a predetermined distance range from the first folded side 314 and the second folded side 315. Note that the gradation portion 331 provided near the second folded side 315 is provided symmetrically to the gradation portion 321 provided near the first folded side 314 and has the same configuration, so only the gradation portion 321 will be described here.

[0077] Assuming that there is a boundary line 321 a parallel to the first bent side 314 at a predetermined distance from the first bent side 314 , the area between the boundary line 321 a and the first bent side 314 is the gradation portion 321 .

[0078] The width of the gradation portion 321 (the distance from the first bent side 314 to the boundary line 321a) is preferably 2 mm or more and 10 mm or less.

[0079] In the gradation portion 321, a plurality of applied portions 321b are provided by applying the transparent material at a constant density so that the size of the applied portions 321b decreases from the boundary line 321a to the first bent side 314. As a result, in the gradation portion 321, the density of the non-applied portions 321c to which the transparent material is not applied increases as the gradation portion 321 approaches the first bent side 314 from the boundary line 321a, and the amount of transparent material applied per unit area decreases. In this embodiment, the applied portions 321b and the non-applied portions 321c are provided alternately on the first bent side 314.

[0080] 5, the gradation portion 321 may be provided in a region of the first folded portion 312a adjacent to the first folded side 314 from the first surface member 311 beyond the first folded side 314. In the portion of the gradation portion 321 provided in the first folded portion 312a, the amount of transparent material applied per unit area decreases with increasing distance from the first folded side 314.

[0081] In other words, assuming a boundary line 321d that is parallel to the first bent edge 314 and a predetermined distance away from the first bent edge 314 toward the first folded portion 312a, a gradation portion 321 is provided between the boundary line 321a and the boundary line 321d, and the amount of transparent material applied per unit area decreases the closer to the boundary line 321d from the boundary line 321a.

[0082] The rate of change in the amount of transparent material applied in the gradation portions 321 and 331 can be set arbitrarily, for example, between 20% and 100%.

[0083] (3) Effects In this embodiment, the gradation portion 321 is also provided near the first folded edge 314 and the second folded edge 315 of the first surface member 311, so that opaque areas are less likely to be formed near the first folded edge 314 and the second folded edge 315, enhancing the sense of unity of the entire transparent portion 320 and creating an excellent aesthetic impression.

[0084] Furthermore, since the gradation portion 321 is also provided near the first folded edge 314 of the first folded portion 312a, even if a processing error occurs when folding a single sheet of paper base material to form the first folded edge 14, the application portion 321b to which the transparent material has been applied can be positioned on or immediately adjacent to the first folded edge 314, making it easier to manufacture the paper container 300.

[0085] 4. Modifications of the First to Third Embodiments Modifications of the above-mentioned first to third embodiments will now be described.

[0086] (1) Change Example 1 In each of the above-described embodiments, coated areas to which the transparent material is applied and non-coated areas to which the transparent material is not applied are alternately provided on the folded edge, but as shown in FIG. 6, coated areas 421b, 431b may not be present on folded edge 414, and gradation areas 421, 431 may be provided so that no transparent material is applied on folded edge 414.

[0087] In this modification, since no transparent material is applied to the folded edge 414, the decrease in tear strength at the folded edge 414 can be significantly suppressed.

[0088] (2) Change Example 2 In each of the above-described embodiments, the size of the application area in the gradation portion is changed so that the amount of transparent material applied per unit area decreases the closer to the bent edge; however, the density of the application area in the gradation portion may be changed, or both the size and density of the application area may be changed, so that the amount of transparent material applied per unit area decreases the closer to the bent edge.

[0089] In addition, in each of the above-described embodiments, the application portion is provided in a circular shape, but it may be provided in any shape, such as a rectangular shape or a polygonal shape.

[0090] (3) Change Example 3 In each of the above-described embodiments, the amount of processing of the transparent material applied to the transparent portion is constant, but the amount of transparent material applied per unit area may be changed to be smaller by arranging the transparent portion such that the amount of processing of the transparent material applied to the gradation portion decreases the closer it is to the bent edge, or by changing the amount of processing of the transparent material and the density of the application portion.

[0091] 5. Modification of the Third Embodiment Next, a modification of the third embodiment will be described with reference to FIGS.

[0092] The paper container 500 of this modified example differs from the above-described third embodiment in that a hanging hole 540 and an adhesive hole 550 are provided on the upper side of the bag body 501.

[0093] (1) Configuration of the paper container 500 The paper container 500 of this modified example is a packaging bag including a bag-shaped bag body 501 having a storage space S for storing contents, and a lower flap 502 protruding from the lower edge of the bag body 501. The paper container 500 is formed by folding a single sheet of paper material cut into a predetermined shape as shown in FIG.

[0094] The bag body 501 constituting the paper container 500 includes a rectangular first surface member 511, a second surface member 512 provided on top of the first surface member 511, and an upper flap (adhesive piece) 513. In the bag body 501, a storage space S is formed between the first surface member 511 and the second surface member 512, and an opening communicating with the storage space S is formed in the open side 517.

[0095] The second surface member 512 includes a first folded portion 512a folded back from a first folded side 514 constituting the right edge of the first surface member 511, and a second folded portion 512b folded back from a second folded side 515 constituting the left edge of the first surface member 511. The tip of the first folded portion 512a is overlapped with the tip of the second folded portion 512b and adhered to the second folded portion 512b. In this modification, the first folded portion 512a has a larger dimension in the left-right direction than the second folded portion 512b, and the first folded portion 512a is adhered to the second folded portion 512b in the vicinity of the second folded side 515.

[0096] The upper flap 513 is formed by folding back a third folded side 516 that constitutes the upper edge of the first surface member 511. The third folded side 516 is adjacent to the first folded side 514 and the second folded side 515.

[0097] A first adhesive portion 536a and a second adhesive portion 536b are provided along the left-right direction near the tip of the upper flap 513. The upper flap 513 is folded back from the third folded side 516 so as to overlap the outside of the second surface member 512, and is adhered to the outside of the second surface member 512 by the first adhesive portion 536a and the second adhesive portion 536b, thereby closing the upper side of the storage space S. In this modified example, the first adhesive portion 536a and the second adhesive portion 536b are provided so as to be continuously connected in the left-right direction.

[0098] The bag body 501 has a storage space S formed between the first surface member 511 and the second surface member 512 closed at the first folded edge 514, the second folded edge 515, and the third folded edge 516, and opens at an open edge 517 opposite the third folded edge 516. The contents are inserted from the open edge 517 to store the contents in the storage space S.

[0099] The bottom flap 502 is connected to the first surface member 511 at the open side 517. An adhesive tape 503 with release paper is provided along the left-right direction at the tip of the bottom flap 502. After the release paper of the adhesive tape 503 is peeled off, the bottom flap 502 is folded back from the open side 517 of the first surface member 511 so as to overlap the outside of the second surface member 512, and is adhered to the outside of the second surface member 512 to close the opening of the storage space S.

[0100] In such a paper container 500, a transparent portion 520 is formed by applying a transparent material to at least a part of a first surface member 511. In the transparent portion 520, gradation portions 521, 531 are formed in an area within a predetermined distance from a first folded side 514 and a second folded side 515, similar to the transparent portion 320 in the third embodiment described above.

[0101] Furthermore, the paper container 500 is provided with hanging holes 540 in the first surface member 511, the second surface member 512 and the upper flap 513, and an adhesive hole 550 penetrating the second surface member 512.

[0102] (2) Hanging hole 540 The hanging hole 540 is a through-hole that passes through the portion where the first surface member 511, the second surface member 512, and the upper flap 513 overlap.

[0103] In other words, as shown in Figure 9, the hanging hole 540 comprises a first hanging hole 540a provided in the first surface member 511, a second hanging hole 540b provided in the first folded portion 512a that constitutes the second surface member 512, and a third hanging hole 540c provided in the upper flap 513, and the first hanging hole 540a, the second hanging hole 540b and the third hanging hole 540c are connected from the first surface member 511 side to the second surface member 512 side.

[0104] The hanging hole 540 is provided at a position different in the left-right direction from the portion where the first folded portion 512a and the second folded portion 512b overlap each other. For example, the hanging hole 540 is provided in the center of the bag body 501 in the left-right direction.

[0105] In addition, in this modified example, the first hanging hole 540a, the second hanging hole 540b, and the third hanging hole 540c constituting the hanging hole 540 are formed to have a circular shape, but the hanging holes can be formed in any shape, such as a shape in which a hole extending upward is connected to the center of a long hole that is elongated in the left-right direction, such as hanging hole 541 shown in Figure 12.

[0106] The first hanging hole 540a, the second hanging hole 540b, and the third hanging hole 540c may all be of the same shape and size, but it is preferable that the first hanging hole 540a has a smaller opening area than the second hanging hole 540b and the third hanging hole 540c.

[0107] For example, in the present modified example, when the first hanging hole 540a, the second hanging hole 540b and the third hanging hole 540c are circular through holes, the first hanging hole 540a has a smaller inner diameter than the second hanging hole 540b and the third hanging hole 540c.

[0108] By making the first hanging hole 540a small, the edges of the second hanging hole 540b and the third hanging hole 540c are positioned outside the first hanging hole 540a, and as shown in Figure 7, when the paper container 500 is viewed from the first surface member 511 side, the edges of the second hanging hole 540b and the third hanging hole 540c are hidden by the first surface member 511.

[0109] (3) Adhesive hole 550 As shown in FIGS. 8 and 9, the adhesive hole 550 is a through-hole that penetrates the second surface member 512, and is provided in a portion of the second surface member 512 where the upper flap 513 overlaps.

[0110] More specifically, the adhesive hole 550 is provided at a position where the second adhesive portion 536b provided on the upper flap 513 of the second surface member 512 overlaps with the second adhesive portion 536b. As a result, the second adhesive portion 536b adheres the upper flap 513 and the first surface member 511 through the adhesive hole 550.

[0111] In this modification, as shown in Fig. 8 and Fig. 10, the adhesive hole 550 is formed in a long and narrow shape elongated in the left-right direction. The adhesive hole 550 is provided at a position away from the second hanging hole 540b, and is provided in the first folded portion 512a of the second surface member 512 so as to be separated from the second hanging hole 540b and not connected to each other. The adhesive hole 550 is provided avoiding the lower side of the second hanging hole 540b. In addition, the lower end of the adhesive hole 550 is located at the same position as the lower end of the hanging hole 540 in the up-down direction, or is located lower than the lower end of the hanging hole 540.

[0112] The adhesive hole 550 may be provided in any position and shape as long as it overlaps with the second adhesive portion 536b. For example, an adhesive hole 551 may be provided below the hanging hole 540 as shown in Fig. 13. Alternatively, a plurality of circular adhesive holes 552 may be provided at intervals in the left-right direction as shown in Fig. 14, a long hole-shaped through hole 553 extending in the up-down direction may be provided on one of the left and right sides of the hanging hole 540 as shown in Fig. 15, or long hole-shaped through holes 553 extending in the up-down direction may be provided on both the left and right sides of the hanging hole 540 as shown in Fig. 16.

[0113] The adhesive hole 550 may be formed in any shape, but in this modification, as shown in FIG. 10, the adhesive hole 550 is formed in the shape of a long and narrow hole that is elongated in the left-right direction.

[0114] (4) Manufacturing of paper containers 500 Next, a method for manufacturing the paper container 500 will be described.

[0115] First, a paper member as illustrated in FIG. 10 is prepared, which includes the lower flap 502, the first surface member 511, the first folded portion 512a, the second folded portion 512b, the upper flap 513, the hanging holes 540a, 540b, 540c and the adhesive holes 550.

[0116] Then, the adhesive tape 503, the first adhesive portion 536a, and the second adhesive portion 536b are provided on the lower flap 502, the second folded portion 512b, and the upper flap 513.

[0117] Next, the second folded portion 512b and the first folded portion 512a are folded back in this order so as to overlap the first surface member 511, and the first folded portion 512a and the second folded portion 512b are bonded together. This results in a paper container in which the storage space S is open upward and downward, as shown in Fig. 11. In this paper container, the first hanging hole 540a provided in the first surface member 511 and the second hanging hole 540b provided in the first folded portion 512a overlap and communicate with each other.

[0118] Then, the upper flap 513 is folded back from the third folded edge 516 of the first surface member 511 and overlapped on the outside of the second surface member 512, and the upper flap 513 and the second surface member 512 are adhered to each other by the first adhesive portion 536a, and the upper flap 513 and the first surface member 511 are adhered to each other through the adhesive hole 550 by the second adhesive portion 536b.

[0119] 7 to 9, the third hanging hole 540c provided in the upper flap 513 overlaps with the first hanging hole 540a provided in the first surface member 511 and the second hanging hole 540b provided in the first folded-back portion 512a to form the hanging hole 540. Also, while the upper side of the storage space S is closed by the upper flap 513, the adhesion area between the upper flap 513 and the first surface member 511 by the second adhesive portion 536b is formed within the storage space S, and the paper container 500 in which the storage space S is partitioned by the contact area can be manufactured.

[0120] (5) Effects The paper container 500 of this modified example has a hanging hole 540 that penetrates the first surface member 511, the second surface member 512, and the upper flap 513, so that it can be hung and displayed by inserting a hook provided on a display shelf.

[0121] Furthermore, the paper container 500 of this modified example is provided with a first adhesive portion 536a that adheres the upper flap 513 to the second surface member 512, and a second adhesive portion 536b that adheres the upper flap 513 to the first surface member 511 through an adhesive hole 550. Therefore, by folding back the upper flap 513 so that it overlaps with the outside of the second surface member 512, the upper side of the storage space S can be blocked, and a partition can be formed near the hanging hole 540c provided in the upper flap 513 to prevent contact between the contents in the storage space S and the hook.

[0122] In the paper container 500 of this modified example, when the lower end of the adhesive hole 550 is located at the same position vertically as the lower end of the hanging hole 540, or lower than the lower end of the hanging hole 540, the contents in the storage space S are less likely to move above the hanging hole 540, thereby preventing contact between the contents and the hooks.

[0123] In the paper container 500 of this modified example, when the adhesive holes 550 are provided on both the left and right sides of the hanging hole 540, the contents are less likely to wrap around the sides of the hanging hole 540, and contact between the contents and the hooks can be prevented.

[0124] In the paper container 500 of this modified example, the hanging hole 540 and the adhesive hole 550 are provided separately, so that the second surface member 512 can have an appropriate rigidity, making it easier to make the paper container 500 into a bag.

[0125] In the paper container 500 of this modified example, if the first hanging hole 540a that penetrates the first surface member 511 is smaller than the hanging hole 540b that penetrates the second surface member 512 and the hanging hole 540c that penetrates the upper flap 513, even if there is dimensional variation in the bags made of the paper container 500, when the paper container 500 is viewed from the first surface member 511 side, the edges of the second hanging hole 540b and the third hanging hole 540c are hidden by the first surface member 511, and a hanging hole 540 of a uniform shape can be formed, so the aesthetic appearance of the paper container 500 is not marred.

[0126] In the paper container 500 of this modified example, the hanging hole 540 is provided at a different position in the left-right direction from the portion where the first folded portion 512a and the second folded portion 512b overlap. Therefore, the hanging hole 540b does not need to be provided across the first folded portion 512a and the second folded portion 512b, making it easier to manufacture the paper container 500.

[0127] In addition, in this modified example, the first folded portion 512a has a larger left-right dimension than the second folded portion 512b, and the first folded portion 512a is adhered to the second folded portion 512b near the second folded side 515, making it easier to print on the second surface member 512. [Explanation of symbols]

[0128] 10...paper container, 11...first surface member, 12...second surface member, 13...adhesive piece, 14...first folded edge, 15...second folded edge, 16...open edge, 17...open edge, 20...first transparent portion, 21...first gradation portion, 21a...boundary line, 21b...coated portion, 21c...non-coated portion, 22...third gradation portion, 22a...boundary line, 22b...coated portion, 22c...non-coated portion, 30...second transparent portion, 31...second gradation portion, 31 a...boundary line, 31b...applied portion, 200...paper container, 221...gradation portion, 221b...applied portion, 221d...boundary portion, 300...paper container, 301...bag body, 302...flap, 303...adhesive tape, 311...first surface member, 312...second surface member, 312a...first folded portion, 312b...second folded portion, 313...adhesive strip, 314...first folded edge, 315...second folded edge, 316...third folded edge, 317...open edge

Claims

1. A paper container comprising: a first surface member; a second surface member that is disposed on top of the first surface member and forms a storage space between the first surface member and a folded edge that is formed by folding a single sheet of paper base material and that constitutes the periphery of the first surface member; and a transparent portion in which a transparent material is applied to at least a portion of the first surface member, The transparent portion has a gradation portion in an area within a predetermined range of distance from the folded edge, in which the amount of transparent material applied per unit area decreases the closer to the folded edge.

2. The paper container according to claim 1, wherein the gradation portion is formed by arranging a plurality of application portions of a predetermined shape formed by applying a transparent material, and at least one of the size and density of the application portions decreases toward the folded edge.

3. The bent side constitutes a peripheral edge of the first surface member and the second surface member, a second transparent portion provided with a transparent material on at least a portion of the second surface member; The paper container according to claim 1, wherein the second transparent portion has a second gradation portion in an area within a predetermined range of distance from the folded edge, in which the amount of transparent material applied per unit area decreases the closer to the folded edge.

4. The bent side constitutes a peripheral edge of the first surface member and the second surface member, The paper container according to claim 1, wherein the gradation portion is provided on the first surface member and the second surface member across the folded edge, and the amount of transparent material applied per unit area on the second surface member decreases the further away from the folded edge.

5. 2. The paper container according to claim 1, wherein the folded edge has alternating areas where the transparent material is applied and areas where the transparent material is not applied.

6. The paper container according to claim 1 , wherein no transparent material is applied to the folded side.

7. The storage space is rectangular, The paper container according to any one of claims 1 to 6, comprising the folded edge, a second folded edge adjacent to the folded edge and closing the storage space, and two open edges that open the storage space.

8. The bag has a bag-shaped bag body with the storage space formed therein and an opening at the bottom, and a lower flap protruding downward from a lower edge of the bag body. The paper container described in claim 1, wherein the bag body comprises the first surface member, the second surface member, an upper flap folded back from the upper edge of the first surface member to overlap the outside of the second surface member and close the upper side of the storage space, a hanging hole penetrating the first surface member, the second surface member and the upper flap, a first adhesive portion adhering the upper flap to the second surface member, an adhesive hole provided in the portion of the second surface member where the upper flap overlaps, and a second adhesive portion adhering the upper flap to the first surface member through the adhesive hole.

9. The paper container according to claim 8 , wherein the hanging hole and the adhesive hole are provided separately in the second surface member.

10. The paper container according to claim 8 or 9, wherein a plurality of the adhesive holes are provided at intervals in the left-right direction.

11. The paper container according to claim 8 or 9, wherein the adhesive holes are provided on both the left and right sides of the hanging hole.

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