Angular paper container, container with contents, and blank

Abstract

To provide a square paper container, a content-containing container, and a blank capable of suppressing adhesion failure of a top seal lid, improving strength of a flange, and improving stability of adhesion strength of the top seal lid.SOLUTION: A square paper container 2 according to an embodiment is a square paper container 2 formed of a paper material, and has a flange 23 in which the number of overlapping layers of the paper material at least on a center side of a flange side and at a flange corner is the same and is two or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rectangular paper container, a container filled with a content, and a blank. [Background technology]

[0002] Square containers have long been known as packaging containers for storing food, etc. For example, square containers are made by folding a blank made of a paper base material and bonding multiple flange pieces formed on the blank to form a single flange along the opening.

[0003] For example, a technology is known in which the flange of a rectangular container has two layers of paper substrate on the flange edge and three layers of paper substrate on the flange corner (see, for example, Patent Document 1). Also, a technology is known in which the flange of a rectangular container has one layer of paper substrate on the flange edge and two layers of paper substrate on the flange corner (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3104100 [Patent Document 2] Patent No. 5990873 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the number of overlapping layers of paper substrate differs between the flange edge and the flange corner, the thickness will differ between the flange edge and the flange corner. After filling the contents, when attaching a top-sealed lid to the flange, the difference in flange thickness will cause uneven pressure, leading to poor adhesion of the top-sealed lid, poor sealing, and difficulty in handling due to increased or decreased hand strain when removing the lid. Another problem is that the flange edge, which is longer than the flange corner, has lower strength, which can lead to deformation when holding the flange, making it difficult to hold securely.

[0006] Therefore, the present invention aims to provide a square paper container, a container filled with contents, and a blank that can suppress poor adhesion of the top seal lid, improve the strength of the flange, and improve the stability of the adhesive strength of the top seal lid. [Means for solving the problem]

[0007] According to one aspect of the present invention, the rectangular paper container is a rectangular paper container formed of a paper material, and has a flange in which the number of overlapping layers of the paper material at least at the center of the flange edge and at the flange corners is the same, and is two or more layers. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a square paper container, a container filled with contents, and a blank that can suppress poor adhesion of the top seal lid, improve the strength of the flange, and improve the stability of the adhesive strength of the top seal lid. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing the configuration of a container containing contents according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the configuration of the rectangular paper container containing the same contents. [Figure 3] FIG. [Figure 4]FIG. 2 is a perspective view showing the configuration of the outer member of the rectangular paper container. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a perspective view showing an example of a manufacturing method of the inner container. [Figure 8] FIG. 10 is a perspective view showing an example of a manufacturing method of the inner container. [Figure 9] FIG. 10 is a perspective view showing an example of a manufacturing method of the inner container. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the configuration of a content-containing container 1 according to an embodiment of the present invention will be described with reference to FIGS. Fig. 1 is a perspective view showing the configuration of a content-filled container 1 according to an embodiment of the present invention, Fig. 2 is a perspective view showing the configuration of a square paper container 2 of the content-filled container 1, Fig. 3 is a perspective view showing an inner container 11 of the square paper container 2, and Fig. 4 is a perspective view showing the configuration of an outer member 12 of the square paper container 2. Fig. 5 is a plan view showing the configuration of a blank 111 of the inner container 11, and Fig. 6 is a plan view showing the configuration of a blank 112 of the outer member 12.

[0011] As shown in Figures 1 to 4, a content-filled container 1 comprises a rectangular paper container 2, a lid 3 that seals the rectangular paper container 2, and a content 4 that is accommodated in the rectangular paper container 2. As shown in Figure 1, the content-filled container 1 is formed by sealing the rectangular paper container 2 with the lid 3 while the content 4 is accommodated inside the rectangular paper container 2. Here, the content 4 is, for example, a food product that can be cooked in hot water or by heating in a microwave, such as instant noodles.

[0012] The rectangular paper container 2 comprises an inner container 11 and an outer member 12 fixed to the outside of the inner container 11. The rectangular paper container 2 is formed into an integrated shape by sandwiching and fixing a portion of the outer member 12 between portions of the inner container 11. For example, the rectangular paper container 2 is formed by sandwiching the outer member 12 between portions of the inner container 11 and fixing the outer member 12 to the inner container 11 by adhesive. The inner container 11 and the outer member 12 of the rectangular paper container 2 are made of a paper material. Here, the paper material refers to a material containing 51% or more paper material by weight. The paper material may contain resin or metal as part of its composition. The inner container 11 and the outer member 12 are formed by folding and shaping a single blank 111, 112 formed by punching or the like from a paper base material made of paper material, and then bonding them together. Here, bonding may include welding by heat sealing a seal layer formed of a resin material on the paper base material, or bonding with an adhesive. The fixing of the inner container 11 and the outer member 12 can include welding by heat sealing a seal layer made of a resin material formed on a paper base material, bonding with an adhesive, and fixing by sandwiching.

[0013] 1 to 3, the inner container 11 includes a bottom 21, a body 22, and a flange 23. The inner container 11 is formed, for example, in a rectangular shape in which the width of the body 22 gradually increases from the bottom 21 side toward the flange 23.

[0014] The bottom portion 21 is formed in the shape of a rectangular flat plate. The bottom portion 21 is formed integrally with the lower end of the body portion 22. The bottom portion 21 is formed in the shape of a rectangle that is longer in one direction than in another direction perpendicular to the one direction.

[0015] The body portion 22 comprises a pair of first side portions 22a, a pair of second side portions 22b each having a smaller width in the circumferential direction of the body portion 22 than the first side portions 22a, four corner portions 22c arranged between the first side portions 22a and the second side portions 22b, and a pair of side fold portions 22d provided at each of the four corner portions 22c and extending toward the first side portions 22a and the second side portions 22b, respectively.

[0016] The lower end of the body 22 is closed by the bottom 21, and the upper end is open. The body 22 is formed in a tapered shape, with the pair of first side portions 22a, the pair of second side portions 22b, and the corner portions 22c inclined outward from the bottom 21 side toward the flange 23 side. In other words, the side surface of the body 22 is inclined so that the inner shape of the flange 23 side is larger than that of the bottom 21 side.

[0017] The pair of first side portions 22a, the pair of second side portions 22b, the four corner portions 22c, and the eight side fold-in portions 22d are integrally formed. In addition, the pair of first side portions 22a, the pair of second side portions 22b, the four corner portions 22c, and the eight side fold-in portions 22d are integrally formed with the bottom portion 21.

[0018] The first side portion 22a is formed in a rectangular shape. One of a pair of long sides of the first side portion 22a is continuous with the bottom portion 21, and the other of the pair of long sides is continuous with the flange portion 23. Both short sides of the first side portion 22a are continuous with the side fold-in portions 22d.

[0019] The second side portion 22b is formed in a rectangular shape. One of a pair of long sides of the second side portion 22b is continuous with the bottom portion 21, and the other of the pair of long sides is continuous with the flange portion 23. Both short sides of the second side portion 22b are continuous with the side fold-in portions 22d.

[0020] Corner 22c is formed in a triangular or quadrangular shape, specifically an isosceles triangle shape. Corner 22c has its apex facing bottom 21 and its base facing flange 23. The isosceles sides of corner 22c are continuous with side fold-in portions 22d.

[0021] The side fold-in portions 22d are formed in a triangular or rectangular shape. Two side fold-in portions 22d are provided for each corner 22c, with one on each side of the corner 22c in the circumferential direction of the body 22. One of the two side fold-in portions 22d is continuous with the first side portion 22a and the corner 22c, and the other of the two side fold-in portions 22d is continuous with the second side portion 22b and the corner 22c. The side fold-in portions 22d are folded in half along a fold line formed at the center of the side fold-in portions 22d in the alignment direction of the first side portion 22a or the second side portion 22b and the side fold-in portions 22d. That is, by folding side surface fold-in portion 22d in half, corner 22c can be disposed between first side portion 22a and second side portion 22b, and first side portion 22a and corner 22c are continuous with each other, and second side portion 22b and corner 22c are continuous with each other. Furthermore, by folding side surface fold-in portion 22d in half, the two side surface fold-in portions 22d continuous with one corner 22c are disposed opposite first side portion 22a and second side portion 22b, respectively.

[0022] Specifically, side fold portion 22d has an inner piece 22d1 that is continuous with first side portion 22a or second side portion 22b, and a triangular, e.g., right-angled, inner piece 22d1 and a triangular, e.g., right-angled, outer piece 22d2 that is continuous with corner 22c. Then, by folding along the boundary between inner piece 22d1 and outer piece 22d2 as a fold line, side fold portion 22d that is triangular, e.g., double-layered and right-angled.

[0023] The flange portion 23 is formed in a rectangular frame shape. The flange portion 23 is, for example, a flange of the rectangular paper container 2 formed by laminating a portion of the outer member 12. The flange portion 23 extends, for example, in the same in-plane direction as the main surface of the bottom portion 21. The flange portion 23 has, for example, a pair of first flange pieces 23a, a pair of second flange pieces 23b, four corner flange pieces 23c, and eight fixing pieces (first blank fixing pieces) 23d, which are integrally formed by, for example, bonding. Here, the pair of first flange pieces 23a and the pair of second flange pieces 23b constitute the four sides (flange sides) of the rectangular frame-shaped flange portion 23. Furthermore, the four corner flange pieces 23c and the eight fixing pieces 23d constitute the four corners (flange corners) of the rectangular frame-shaped flange portion 23.

[0024] The first flange piece 23a is integrally formed on the long side of the first side portion 22a opposite the bottom portion 21. The first flange piece 23a is formed longer than the first side portion 22a, and both ends are stacked and fixed to the square flange pieces 23c. The first flange piece 23a is folded in half along a fold line along the longitudinal direction, thereby sandwiching and fixing a portion of the external member 12 at least at the center of the first flange piece 23a in the longitudinal direction. The first flange piece 23a has, for example, a first upper piece 23a1 that is continuous with the first side portion 22a and forms the upper surface, and a first lower piece 23a2 that is continuous with the first upper piece 23a1. The first flange piece 23a is then formed by folding along the boundary along the longitudinal direction between the first upper piece 23a1 and the first lower piece 23a2, forming a long first flange piece 23a in one direction. As a result, of the two pairs of sides of the flange portion 23, the pair formed by the first flange piece 23a has a three-layer structure at least at the center in the longitudinal direction due to the folded-back first flange piece 23a and a part of the outer member 12.

[0025] Furthermore, both ends of the first upper piece 23a1 are inclined relative to the longitudinal direction on both the first side 22a and the lower piece 23a2 sides, with their tips at the apex. The inclination angle of the first upper piece 23a1 is formed so that it is positioned within the area of ​​the angular flange piece 23c. Both ends of the first lower piece 23a2 are inclined in a direction in which their tips become shorter as they extend outward from the first upper piece 23a1. As a result, the end of the first lower piece 23a2 is not positioned between the upper surface of the third lower piece 23c1 (described later) and the lower surface of the third upper piece 23c2 of the angular flange piece 23c, but rather abuts against the lower surface of the third lower piece 23c1. As a result, both ends of the first upper piece 23a1 are sandwiched and fixed between the angular flange piece 23c, while both ends of the first lower piece 23a2 are not sandwiched between the angular flange piece 23c.

[0026] The second flange piece 23b is integrally formed on the long side of the second side portion 22b opposite the bottom portion 21. The second flange piece 23b is formed to be longer than the second side portion 22b. The second flange piece 23b is folded in half along a fold line along the longitudinal direction, thereby sandwiching and fixing a portion of the external member 12 at least at the center side in the longitudinal direction of the second flange piece 23b. The second flange piece 23b has, for example, a second upper piece 23b1 that is continuous with the second side portion 22b and forms the upper surface, and a second lower piece 23b2 that is continuous with the second upper piece 23b1. The second flange piece 23b is formed by folding along the boundary along the longitudinal direction between the second upper piece 23b1 and the second lower piece 23b2 as a fold line. As a result, of the two pairs of sides of the flange portion 23, the pair formed by the second flange piece 23b has a three-layer structure at least at the center in the longitudinal direction due to the folded-back second flange piece 23b and a part of the outer member 12.

[0027] The second flange piece 23b has a different longitudinal length from the first flange piece 23a, but is otherwise identical in shape to the first flange piece 23a. The corners of the second upper piece 23b1 are inclined relative to the longitudinal direction on both the second side 22b side and the second lower piece 23b2 side so that their tips are apexes. The inclination angle of the second upper piece 23b1 is such that it is positioned within the area of ​​the corner flange piece 23c. The ends of the second lower piece 23b2 are inclined in a direction that shortens their length as their tips extend outward from the second upper piece 23b1 in the short direction. As a result, the end of the second lower piece 23b2 is not positioned between the upper surface of a third lower piece 23c1 (described later) and the lower surface of the third upper piece 23c2 of the corner flange piece 23c, but rather abuts against the lower surface of the third lower piece 23c1. As a result, both end portions of the second upper piece 23b1 are sandwiched and fixed between the square flange pieces 23c, and both end portions of the second lower piece 23b2 are not sandwiched between the square flange pieces 23c.

[0028] The corner flange piece 23c is integrally formed on the opposite side of the corner 22c from the bottom 21. The corner flange piece 23c is folded in half along a fold line that is inclined relative to both the longitudinal direction of the first flange piece 23a and the longitudinal direction of the second flange piece 23b, sandwiching and securing the first upper piece 23a1 of the first flange piece 23a and the second upper piece 23b1 of the second flange piece 23b. At this time, the first upper piece 23a1 of the first flange piece 23a and the second upper piece 23b1 of the second flange piece 23b are positioned adjacent to each other but are not stacked. The corner flange piece 23c has, for example, a third lower piece 23c1 that forms the lower surface and is continuous with the corner 22c, and a third upper piece 23c2 that is continuous with the third lower piece 23c1. Then, by folding the third lower piece 23c1 and the third upper piece 23c2 along the boundary that is inclined with respect to both the longitudinal direction of the first flange piece 23a and the longitudinal direction of the second flange piece 23b, a corner flange piece 23c that forms the corner of the flange portion 23 is formed.

[0029] As a result, each corner of the flange portion 23 has a three-layer structure consisting of the third lower piece 23c1, the third upper piece 23c2, and the first upper piece 23a1 of the first flange piece 23a and the second upper piece 23b1 of the second flange piece 23b, whose ends are adjacent but not stacked. The third upper piece 23c2 forms the upper surface of the flange portion 23, and the third lower piece 23c1 forms the lower surface. Furthermore, the third upper piece 23c2 is folded back from the third lower piece 23c1 at the outer edge of the flange portion 23, so that the third upper piece 23c2 is positioned above the third lower piece 23c1. As a result, the folded-back portions of the third lower piece 23c1 and the third upper piece 23c2 form part of the outer edge of the flange portion 23.

[0030] For example, the third lower piece 23c1 and the third upper piece 23c2 are each formed in the same hexagonal shape, and are folded and overlapped to form the hexagonal flange piece 23c. As a result, the flange portion 23 has a rectangular frame shape, and the corners are linearly inclined.

[0031] The fixing piece 23d is, for example, integrally formed on the side opposite the bottom 21 of the side fold-in portion 22d. The fixing piece 23d is, for example, elongated in one direction, longer than the side of the side fold-in portion 22d opposite the bottom 21, and protrudes opposite the corner flange piece 23c. The length of the fixing piece 23d in a direction perpendicular to the longitudinal direction is shorter than the short-side length of the first upper piece 23a1, the short-side length of the first lower piece 23a2, the short-side length of the second upper piece 23b1, and the short-side length of the second lower piece 23b2. Therefore, the fixing piece 23d is folded back and positioned between the stacked first upper piece 23a1 and first lower piece 23a2, and between the stacked second upper piece 23b1 and second lower piece 23b2, and fixed to the first flange piece 23a and the second flange piece 23b. As a result, the ends adjacent to the corners of the two pairs of sides of the flange portion 23 have a three-layer structure made up of the folded-back first flange piece 23a or second flange piece 23b and the fixing piece 23d.

[0032] With these configurations, the two pairs of sides and four corners of the flange portion 23 are formed with the same layer structure, i.e., by laminating the same number of paper base materials. In this embodiment, the two pairs of sides and four corners of the flange portion 23 have a three-layer structure, but two or more layers are sufficient.

[0033] The inner container 11 configured in this manner is formed, for example, by folding and adhering a blank (first blank) 111 of the inner container 11 shown in Fig. 5. For example, the blank 111 is formed by integrally connecting a pair of first side portions 22a, a pair of second side portions 22b, four corner portions 22c, and eight side fold-in portions 22d around the bottom portion 21 in a ring shape in the following order: first side portion 22a, side fold-in portions 22d, corner portion 22c, side fold-in portion 22d, second side portion 22b, side fold-in portion 22d, corner portion 22c, side fold-in portion 22d, first side portion 22a, side fold-in portion 22d, corner portion 22c, side fold-in portion 22d, second side portion 22b.

[0034] The blank 111 is formed by integrally connecting a pair of first flange pieces 23a to a pair of first side portions 22a, a pair of second flange pieces 23b to a pair of second side portions 22b, four corner flange pieces 23c to four corner portions, and eight fixing pieces 23d to eight side fold portions 22d. The blank 111 is formed by punching out each element from a single sheet of paper substrate and forming creases or the like that serve as fold lines at the boundaries between each element. The blank 111 is formed from a paper substrate and has a sealing layer made of a resin material on the surface layer that will become the outer surface of the inner container. The inner container 11 is formed by folding the blank 111 and heat-sealing the sealing layer on the outer surface layer. Note that the blank 111 may not have a sealing layer and be attached to the inner container 11 by adhesive.

[0035] As shown in FIGS. 1, 2 and 4, the outer member 12 includes, for example, a bottom portion 31, legs 32 and sidewall portions 33.

[0036] The bottom 31 is formed in the shape of a rectangular plate. The bottom 31 is formed integrally with the legs 32. The bottom 31 is formed in the shape of a rectangle that is longer in one direction than in another direction perpendicular to the first direction. For example, the bottom 31 of the outer member 12 is formed in the same shape as the bottom 21 of the inner container 11, or in the shape of a rectangle that is slightly smaller in both the longitudinal and lateral directions than the bottom 21 of the inner container 11. For example, when the outer member 12 is fixed to the inner container 11, the bottom 31 is separated from the bottom 21 of the inner container 11 with a predetermined gap therebetween. The bottom 21 of the inner container 11 and the bottom 31 of the outer member 12 can be spaced apart depending on the dimensional relationship between them, for example, by making the height of the side wall 33 of the outer member 12 higher than the height of the side portions 22a, 22b of the inner container 11. This dimensional relationship may include the dimensions of the legs 32 and the height position of the bottom 31 relative to the lower ends of the legs 32.

[0037] The legs 32 include a pair of first legs 32a and a pair of second legs 32b that are narrower than the pair of first legs 32a in a direction along the outer periphery of the bottom 31. The pair of first legs 32a are continuous with the long sides of the bottom 31. The first legs 32a extend downward from the bottom 31 and are folded back to extend upward from the lower end. The first legs 32a include, for example, an inner leg 32a1 that is long in one direction and an outer leg 32a2 that is formed integrally with the inner leg 32a1 and is either the same height as the inner leg 32a1 or a different height. For example, the boundary between the inner leg 32a1 and the outer leg 32a2 is folded along a fold line that runs along the longitudinal direction of the first leg 32a, and the inner leg 32a1 and the outer leg 32a2 are formed spaced apart in opposing directions.

[0038] The pair of second legs 32b are continuous with the short sides of the bottom 31. The second legs 32b extend downward from the bottom 31 and are folded back to extend upward from the lower end. The second legs 32b include, for example, an inner leg 32b1 that is long in one direction and an outer leg 32b2 that is formed integrally with the inner leg 32b1 and is either the same height as the inner leg 32b1 or a different height and is long in one direction. In such legs 32, the pair of first legs 32a and the pair of second legs 32b are continuous with the bottom 31, and adjacent first legs 32a and second legs 32b are discontinuous. For example, the boundary between the inner leg 32b1 and the outer leg 32b2 of the second leg 32b is folded along a folding line along the longitudinal direction of the second leg 32b, and the inner leg 32b1 and the outer leg 32b2 are formed spaced apart in opposing directions.

[0039] The side wall portion 33 includes a pair of first side wall portions 33a, a pair of second side wall portions 33b, and four fixing pieces (fixing pieces for second blank) 33c. The side wall portion 33 is formed integrally with and continuous with the leg portion 32.

[0040] The pair of first side wall portions 33a are formed integrally and contiguous with the pair of first leg portions 32a. The first side wall portions 33a are formed long in one direction, slightly shorter than the longitudinal length of the first side portion 22a, and longer than the distance in the longitudinal direction of the first side portion 22a between the two side fold portions 22d provided on the first side portion 22a. That is, when the first side wall portions 33a are arranged opposite the first side portion 22a, they are formed so that they can be positioned and sandwiched between the first side portion 22a and the two side fold portions 22d corresponding to the first side portion 22a. For example, one short side of the first side wall portion 33a is continuous with the first leg portion 32a, and one fixing piece 33c is formed on the other short side. Furthermore, the longitudinal length of the first side wall portion 33a gradually decreases, for example, from the first leg portion 32a side toward the fixing piece 33c side.

[0041] The pair of second side wall portions 33b are formed integrally and contiguous with the pair of second leg portions 32b. The second side wall portions 33b are formed elongated in one direction, slightly shorter than the longitudinal length of the second side portion 22b, and longer than the distance in the longitudinal direction of the second side portion 22b between the two side fold portions 22d provided on the second side portion 22b. That is, when the second side wall portions 33b are arranged opposite the second side portion 22b, they are formed so as to be positioned and sandwiched between the two side fold portions 22d corresponding to the second side portion 22b and the second side portion 22b. For example, one short side of the second side wall portion 33b is continuous with the second leg portion 32b, and one fixing piece 33c is formed on the other short side. Furthermore, the longitudinal length of the second side wall portion 33b gradually decreases, for example, from the second leg portion 32b side toward the fixing piece 33c side.

[0042] The four fixing pieces 33c are provided on the upper edges of the pair of first side wall portions 33a and the upper edges of the pair of second side wall portions 33b. Of the four fixing pieces 33c, a pair of fixing pieces 33c formed integrally and continuously with the pair of first side wall portions 33a will hereinafter be referred to as a pair of first fixing pieces 33c1, and a pair of fixing pieces 33c formed integrally and continuously with the pair of second side wall portions 33b will hereinafter be referred to as a pair of second fixing pieces 33c2.

[0043] The first fixing piece 33c1 is formed to be long in one direction. The longitudinal length of the first fixing piece 33c1 is shorter than the distance between the two fixing pieces 23d provided on the two side surface folded portions 22d provided opposite the first side portion 22a in the longitudinal direction of the first side portion 22a. Furthermore, the length of the first fixing piece 33c1 in the lateral direction perpendicular to the longitudinal direction is shorter than the lateral lengths of the first upper piece 23a1 and the first lower piece 23a2. As a result, the first fixing piece 33c1 is folded back with the two fixing pieces 23d arranged side by side at both ends, and is then placed between the stacked first upper piece 23a1 and first lower piece 23a2 together with the two fixing pieces 23d. The first fixing piece 33c1 is fixed to the first flange piece 23a by being adhered to the first upper piece 23a1 and the first lower piece 23a2.

[0044] The second fixing piece 33c2 is formed to be long in one direction. The longitudinal length of the second fixing piece 33c2 is shorter than the distance between the two fixing pieces 23d provided on the two side fold-in portions 22d provided opposite the second side portion 22b in the longitudinal direction of the second side portion 22b. Furthermore, the length of the second fixing piece 33c2 in the lateral direction perpendicular to the longitudinal direction is shorter than the lateral lengths of the second upper piece 23b1 and the second lower piece 23b2. As a result, the second fixing piece 33c2 is folded back with the two fixing pieces 23d arranged side by side at both ends, and is then placed between the stacked second upper piece 23b1 and second lower piece 23b2 together with the two fixing pieces 23d. The second fixing piece 33c2 is fixed to the second flange piece 23b by being adhered to the second upper piece 23b1 and second lower piece 23b2.

[0045] As described above, the pair of first fixing pieces 33c1 and the pair of second fixing pieces 33c2 form one layer of the three layers of the side portion at both longitudinal ends of the flange portion 23. Furthermore, each fixing piece 33c1, 33c2 is disposed adjacent to the fixing piece 23d of the inner container 11 with a small gap therebetween. Therefore, each side portion of the flange portion 23 has a three-layer structure over substantially the entire length.

[0046] The external member 12 configured as described above is formed, for example, by folding a blank (second blank) 112 of the external member 12 shown in FIG. 6. For example, the blank 112 is formed by integrally connecting a pair of first leg portions 32a and a pair of second leg portions 32b around the bottom portion 31. The blank 112 is also formed by integrally connecting a pair of first side wall portions 33a to the pair of first leg portions 32a, integrally connecting a pair of second side wall portions 33b to the pair of second leg portions 32b, integrally connecting a pair of first fixing pieces 33c1 to the pair of first side wall portions 33a, and integrally connecting a pair of second fixing pieces 33c2 to the pair of second side wall portions 33b. The blank 112 is formed by punching out each element from a sheet of paper substrate using a punching process, and forming dents or the like that serve as fold lines at the boundaries between the elements. Furthermore, the blank 112 is formed of a paper base material, but does not have a sealing layer made of a resin material on its surface layer, and is adhered to the inner container 11 by a sealing layer formed on the surface layer of the blank 111 of the inner container 11. Note that the paper base material forming the blank 112 may have a sealing layer made of a resin material on its surface layer.

[0047] As shown in Fig. 1, the lid 3 is formed, for example, in the shape of a sheet. The lid 3 is a so-called top seal or top-seal lid, and is adhered to the flange 23 of the inner container 11. The lid 3 has, for example, a seal layer made of a heat-sealable resin material on the surface facing the flange 23 of the inner container 11. For example, the lid 3 may use a resin material, a paper material, and / or a metal material as its base material. The lid 3 is heat-sealed to the flange 23 of the inner container 11 to seal the inner container 11.

[0048] Next, an example of a method for manufacturing the rectangular paper container 2 configured as described above will be described. First, blanks 111 and 112 are formed from a paper base material. Next, the blanks 111 and 112 are folded to form the inner container 11 and outer member 12 in their unbonded state. As a specific example, first, the blank 111 of the inner container 11 shown in FIG. 4 is folded along each fold line to form the unbonded inner container 11 as shown in FIG. 7. Next, as shown in FIG. 8, both ends of the pair of first upper pieces 23a1 of the pair of first flange pieces 23a and both ends of the pair of second upper pieces 23b1 of the pair of second flange pieces 23b are placed on the third lower pieces 23c1 of the four rectangular flange pieces 23c. Then, as shown in Figure 9, the third upper piece 23c2 is placed on top of the third lower piece 23c1 of the four corner flange pieces 23c, sandwiching the first upper piece 23a1 and the second upper piece 23b1, and adhesively fixing the first upper piece 23a1, the second upper piece 23b1 and the corner flange piece 23c.

[0049] At this time, the first lower piece 23a2 and the second lower piece 23b2 extend downward because they are not sandwiched between the angular flange pieces 23c, as shown in Fig. 9. Then, the pair of first fixing pieces 33c1 and the pair of second fixing pieces 33c2 of the outer member 12, which has been bent and shaped as shown in Fig. 4, and the fixing pieces 23d provided on the eight side fold-in portions 22d of the inner container 11 are respectively arranged between the first upper piece 23a1 and the first lower piece 23a2 of the first flange piece 23a and between the second upper piece 23b1 and the second lower piece 23b2 of the second flange piece 23b. Then, the first upper piece 23a1 and the first lower piece 23a2, and the second upper piece 23b1 and the second lower piece 23b2 are bonded together by heat sealing.

[0050] Furthermore, when the pair of first side wall portions 33a and the pair of second side wall portions 33b of the outer member 12 are arranged opposite the pair of first side portions 22a and the pair of second side portions 22b, each first side wall portion 33a is sandwiched between the first side portion 22a and the two corresponding side surface folded portions 22d, and each second side wall portion 33b is sandwiched between the second side portion 22b and the two corresponding side surface folded portions 22d. The pair of first side wall portions 33a and the pair of second side wall portions 33b may or may not be bonded to the pair of first side portions 22a, the pair of second side portions 22b, and / or the inner pieces 22d1 of the plurality of side surface folded portions 22d.

[0051] However, if the pair of first side walls 33a and the pair of second side walls 33b are not bonded to the pair of first side portions 22a and the pair of second side portions 22b, a gap is generated between the pair of first side portions 22a and the pair of second side portions 22b and the pair of first side walls 33a and the pair of second side walls 33b, thereby improving heat insulation. For this reason, it is preferable that the pair of first side portions 22a and the pair of second side portions 22b are not bonded to the pair of first side walls 33a and the pair of second side walls 33b.

[0052] As a result, the inner container 11 and outer member 12 are integrally formed as shown in Figure 2, and a rectangular paper container 2 is manufactured. The manufactured rectangular paper container 2 is filled with contents 4, and the lid 3 is heat-sealed to the flange portion 23 of the rectangular paper container 2 as a top seal, and then packaged with a laminate film, thereby manufacturing a container 1 filled with the contents.

[0053] According to the rectangular paper container 2 and the container 1 containing contents configured in this manner, a part of the outer member 12 is sandwiched and fixed to a part of the inner container 11, thereby preventing the outer member 12 from coming off the inner container 11.

[0054] Specifically, the first side wall portion 33a and the second side wall portion 33b of the outer member 12 are sandwiched between the first side portion 22a and the lateral folded-in portion 22d, and between the second side portion 22b and the lateral folded-in portion 22d. This strengthens the fit and fixation between the inner container 11 and the outer member 12, making it difficult for the outer member 12 to come off the inner container 11 and improving the strength of the body portion 22 of the inner container 11. As a result, the shape of the body portion 22 of the rectangular paper container 2 is less likely to deform, ensuring shape stability. Furthermore, since the rectangular paper container 2 has a substantially double peripheral wall, it is possible to ensure thermal insulation even though it is made of a paper base material. Therefore, when the contents 4 are food to be cooked in hot water or the like, heat from the hot water is less likely to be transferred to the user. Furthermore, deformation due to the weight of the contents 4 and hot water is suppressed, making the rectangular paper container 2 easier for the user to hold and providing excellent usability.

[0055] Additionally, the four fixing pieces 33c of the outer member 12 are fixed by being sandwiched between the upper pieces 23a1, 23b1 and the lower pieces 23a2, 23b2 of the flange pieces 23a, 23b of the flange portion 23 of the inner container 11. This improves the strength of the flange portion 23, and therefore the strength of the rectangular paper container 2. Therefore, when holding the flange portion 23, the rectangular paper container 2 is less likely to deform and is easier to hold, and when peeling off the lid 3, the flange portion 23 is less likely to deform and the lid 3 is easier to peel off.

[0056] Furthermore, flange portion 23 is configured such that upper pieces 23a1, 23b1 of flange pieces 23a, 23b are integrally continuous with body portion 22, and lower pieces 23a2, 23b2 located below upper pieces 23a1, 23b1 are integrally continuous with upper pieces 23a1, 23b1. As a result, the folded portion of flange portion 23 is located on the outside, and the outer periphery of flange portion 23 is rounded, which can prevent fingers from being cut and the exterior film packaging content-filled container 1 from being damaged.

[0057] Furthermore, the flange portion 23 has the same number of layers of paper base material (paper material) at least on the center side of each of the two pairs of sides (flange sides) and at the four corners (flange corners), and the number of layers is two or more, preferably three or more. In this embodiment, the two pairs of sides of the flange portion 23 are formed into three layers by the inner container 11 and the outer member 12, and the four corners of the flange portion 23 are formed into three layers by the inner container 11.

[0058] This makes the strength of each part of the flange portion 23 uniform, improving its strength. In particular, since the two pairs of sides of the flange portion 23 are configured to extend in one direction, the central portion is prone to deformation, but the pair of first fixing pieces 33c1 and the pair of second fixing pieces 33c2 extending in one direction of the outer member 12 form a three-layer structure. This improves the strength of the flange portion 23. By improving the strength of the flange portion 23, deformation of the flange portion 23 can be suppressed when peeling off the lid 3, which serves as the top seal, making it easier to peel off the lid 3. Furthermore, when cooking the contents 4 using hot water filled in the square paper container 2, deformation of the flange portion 23 can be suppressed, allowing the flange portion 23 to be held stably when draining the hot water.

[0059] Furthermore, by making the number of layers the same at the sides and corners of the flange portion 23, the thickness of the flange portion 23 becomes uniform. Therefore, the inner container 11 and the outer member 12 can be easily bonded as a single unit to the flange portion 23 by heat welding, adhesive, ultrasonic sealing, or the like. This prevents poor adhesion of the flange portion 23. Specifically, if the number of overlapping layers of the paper base material at the flange sides and the flange corners in the flange portion 23 differs, thickness differences will occur between the sides and corners. This can cause poor adhesion when the paper base material is bonded in a bonding process such as heat sealing. However, by making the number of layers the same at the sides and corners of the flange portion 23, the thickness of the flange portion 23 becomes uniform, improving formability.

[0060] Furthermore, by arranging the fixing pieces 23d of the inner container 11 and the fixing pieces 33c1, 33c2 of the outer member 12 adjacent to each other, a three-layer structure is formed over most of the edge of the flange portion 23, thereby further improving the strength of the flange portion 23.

[0061] Furthermore, the rectangular paper container 2 is configured such that the pair of first side walls 33a and the pair of second side walls 33b of the outer member 12 are not bonded to the pair of first side walls 33a, the pair of second side walls 33b, and / or the inner pieces 22d1 of the multiple side fold-in portions 22d of the inner container 11. Furthermore, the rectangular paper container 2 is configured such that the bottom 21 of the inner container 11 and the bottom 31 of the outer member 12 are not bonded. This creates a gap between the inner container 11 and the outer member 12, improving insulation and reducing the transfer of heat from the contents 4 and cooking water to the user's fingers, making the rectangular paper container 2 easier to hold and preventing a drop in the temperature of the contents 4. In particular, when the contents 4 are hot water used for cooking and require draining, the rectangular paper container 2 can be strengthened and does not transfer heat easily, allowing the water to be safely drained. Furthermore, because the rectangular paper container 2 has legs 32, the user can drain the water more safely by grasping the flange 23 and legs 32. Furthermore, by bonding the pair of first side wall portions 33a and the pair of second side wall portions 33b to the corresponding inner pieces 22d1 of the side folding portions 22d, the corner portions 22c can be more firmly fixed and the container can be more stable, so by bonding the pair of first side wall portions 33a and the pair of second side wall portions 33b to the corresponding side folding portions 22d, the water can also be drained more safely.

[0062] Furthermore, the rectangular paper container 2 has a seal layer on the inner container 11, but does not have a seal layer on the outer member 12, and is assembled together by heat sealing, which reduces manufacturing costs and is environmentally friendly.

[0063] Furthermore, the rectangular paper container 2 is configured so that the side folding portions 22d, which sandwich the side wall portions 33a, 33b of the outer member 12 between the side walls 33a, 33b of the outer member 12 and the side portions 22a, 22b of the inner container 11, are continuous with the side portions 22a, 22b and the corner portions 22c. This eliminates the need for adhesive to be bonded to the side portions 22a, 22b and / or the corner portions 22c, and prevents part of the adhesive or the like from entering the inner container 11 as a foreign body.

[0064] As described above, the square paper container 2 according to one embodiment of the present invention and the content-filled container 1 using the square paper container 2 can suppress poor adhesion of the flange portion 23 and improve the strength of the flange portion 23.

[0065] In the above example, the rectangular paper container 2 has been described as having a rectangular configuration with the bottom 21 being long in one direction, but this is not limited to this. That is, the shape of the bottom 21 of the rectangular paper container 2 is not limited to a rectangle, and may be a square or another polygonal shape.

[0066] In the above example, the outer peripheral edge of the angular flange piece 23c of the inner container 11 is angular, and the third upper piece 23c2 of the angular flange piece 23c is hexagonal. However, the angular flange piece 23c is not limited to these shapes. For example, the outer peripheral edge of the angular flange piece 23c may be arc-shaped instead of angular, and the third upper piece 23c2 may have a shape that covers the second lower piece 23c1 of the angular flange piece 23c, as well as the first flange piece 23a and the second flange piece 23b. For example, if the outer peripheral edge of the angular flange piece 23c is arc-shaped, damage to the shrink-wrap packaging material can be more effectively prevented when shrink-wrapping is performed to cover the entire content-filled container 1.

[0067] In the above example, the outer member 12 has a fixing piece 33c, but this is not limiting and the outer member 12 may not have the fixing piece 33c. When the outer member 12 is fixed to the corresponding first and second side wall portions 33a and 33b of the inner container 11, a rectangular paper container 2 is formed. However, to make the number of layers at the sides and corners of the flange 23 the same, it is preferable to provide a piece that is integrally formed with the lower pieces 23a2, 23b2 that make up each side of the flange 23 of the inner container 11 and sandwiched between the upper pieces 23a1, 23b1 and the lower pieces 23a2, 23b2, and to stack the pieces, or to reduce the number of layers that form the corners.

[0068] In the above example, the first side portion 22a and the second side portion 22b are formed in a rectangular shape, but the present invention is not limited to this. For example, the first side portion 22a and the second side portion 22b may be formed in a quadrangular shape such as a square or a trapezoid.

[0069] In the above example, the four fixing pieces 33c of the outer member 12 (second blank 112) are preferably arranged and bonded between the stacked first upper piece 23a1 and first lower piece 23a2 and between the stacked second upper piece 23b1 and second lower piece 23b2. However, the four fixing pieces 33c may be arranged and bonded to the outer surface of one of the first upper piece 23a1 and first lower piece 23a2 and the outer surface of one of the second upper piece 23b1 and second lower piece 23b2. That is, the fixing pieces 33c may preferably be fixed to at least one of the first upper piece 23a1 and first lower piece 23a2 and at least one of the second upper piece 23b1 and second lower piece 23b2.

[0070] In the above example, the legs 32 provided on the outer member 12 of the rectangular paper container 2 are configured such that the boundaries between the inner legs 32a1, 32b1 and the outer legs 32a1, 32b2 are folded along a fold line along the longitudinal direction of each leg 32b. By being folded along the fold line, the lower ends of the legs 32 have an acute-angled shape with an apex angle, but the legs 32 are not limited to this configuration. For example, the lower ends of the legs 32 may be configured to be rounded arc-shaped.

[0071] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. [Explanation of symbols]

[0072] 1...container containing contents, 2...rectangular paper container, 3...lid, 4...contents, 11...inner container, 12...outer member, 21...bottom, 22...body, 22a...first side (side), 22b...second side (side), 22c...corner, 22d...side fold-in portion, 22d1...inner piece, 22d2...outer piece, 23...flange portion, 23a...first flange piece (flange piece), 23a1...first upper piece (upper piece), 23a2...first lower piece (lower piece), 23b...second flange piece (flange piece), 23b1...second upper piece (upper piece), 23b2...second lower Piece (lower piece), 23c...square flange piece, 23c1...third lower piece, 23c2...third upper piece, 23d...fixing piece, 31...bottom, 32...leg, 32a...first leg, 32a1...inner leg, 32a2...outer leg, 32b...second leg, 32b1...inner leg, 3 2b2...outer leg part, 33...side wall part, 33a...first side wall part (side wall part), 33b...second side wall part (side wall part), 33c...fixing piece, 33c1...first fixing piece, 33c2...second fixing piece, 111...blank (first blank), 112...blank (second blank).

Claims

1. A rectangular paper container made of a paper material, A rectangular paper container having a flange in which the number of overlapping layers of the paper material at least at the center of the flange side and at the flange corners is the same, and the flange is two or more layers.

2. The rectangular paper container according to claim 1, wherein the number of layers of the paper material overlapping at least on the center side of the flange side and at the flange corners is three or more.

3. The rectangular paper container according to claim 1, wherein the flange corner is formed by laminating a portion of the paper material on an upper surface side of the flange edge.

4. The rectangular paper container according to claim 3, wherein the flange corner has a lower piece arranged on the underside of the end of the flange edge, and an upper piece arranged on the upper side of the end of the flange edge, which is folded back continuously from the lower piece on the outer edge side of the flange.

5. An inner container and an outer member are provided, 3. The rectangular paper container according to claim 2, wherein the flange side is formed of three or more layers, including a flange piece formed on the inner container and a fixing piece formed on the outer member, the fixing piece being laminated with at least the center of the flange side.

6. The square paper container according to any one of claims 1 to 5, Contents to be contained in the square paper container; A container containing a content.

7. A blank formed of the paper material to form a rectangular paper container having a flange in which the number of overlapping layers of paper material at least on the center side of the flange side and at the flange corner is the same and is two or more layers, a pair of first flange pieces that are folded in half and that form the flange sides, each having a first upper piece that forms an upper surface and a first lower piece that is continuous with the first upper piece; a pair of second flange pieces that are folded in half and that form the flange sides, each having a second upper piece that forms an upper surface and a second lower piece that is continuous with the second upper piece; four corner flange pieces forming the flange corners, each of which has a third lower piece forming a lower surface and a third upper piece continuous with the third lower piece, and which are folded in half; A blank comprising:

8. a first blank for forming an inner container, the first blank having the pair of first flange pieces, the pair of second flange pieces, and the four corner flange pieces; a second blank forming an outer member fixed to the outside of the inner container; The first blank further includes eight first blank fixing pieces respectively disposed between the first upper piece and the first lower piece of the pair of first flange pieces that are stacked, and between the second upper piece and the second lower piece of the pair of second flange pieces that are stacked, The second blank includes four second blank fixing pieces that are arranged adjacent to the first blank fixing piece on at least one of the first upper piece and the first lower piece where the pair of first flange pieces are stacked, and on at least one of the second upper piece and the second lower piece where the pair of second flange pieces are stacked, The blank of claim 7, wherein the ends of the first upper piece of the first flange piece and the second upper piece of the second flange piece are sandwiched between the third lower piece and the third upper piece of the adjacent corner flange piece.

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