Angular paper container, container with contents, and blank

Abstract

To provide a square paper container, a content-containing container, and a blank capable of improving strength.SOLUTION: The square paper container 2 according to the embodiment includes a polygonal bottom portion 21, a polygonal body portion 22 provided integrally with the bottom portion 21 and formed in a triangular shape in which a corner 22c is a vertex on the bottom portion 21 side, an upper surface opening 22e formed by a flange portion 23 formed in a polygonal shape having a larger number of corners than the bottom portion 21, and a side surface folding portion 22c integrally formed on both sides of the corner 22d in the circumferential direction of the body portion 22.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] Rectangular paper containers have long been known as packaging containers for storing food and the like. For example, such rectangular paper containers are formed in a polygonal shape. Also, a technique is known for rectangular paper containers in which the flange has more corners than the bottom. For example, a rectangular paper container with a square bottom and an octagonal flange is also known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-011458 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned rectangular paper container, the side walls are bonded together using a bonding margin on one side. However, with this configuration, the constraints between the corners and corner sides are weak, so when opening the container or removing the contents, the designed angles of the corner sides, particularly the corners on the top of the opening (for example, the designed angle is 90 degrees for a rectangle, 45 degrees for an octagon, etc.) cannot be maintained, and the entire container is prone to twisting deformation.

[0005] Therefore, an object of the present invention is to provide a rectangular paper container, a container filled with contents, and a blank that can improve strength. [Means for solving the problem]

[0006] According to one aspect of the present invention, a rectangular paper container comprises a polygonal bottom, a polygonal body formed integrally with the bottom and shaped like a triangle with corners that become vertices on the bottom side, a polygonal top opening with more corners than the bottom, and side fold-in portions formed integrally on both sides of the corners in the circumferential direction of the body. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a rectangular paper container, a container filled with contents, and a blank that can improve strength. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the configuration of a container containing contents according to a first 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. [Figure 10] FIG. 6 is a perspective view showing the configuration of an inner container of a content-filled container according to a second embodiment of the present invention. [Figure 11] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the configuration of a content-containing container 1 according to a first 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 a first 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.

[0010] 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.

[0011] 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.

[0012] As shown in FIGS. 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, with the body 22 gradually increasing in width from the bottom 21 toward the flange 23. The inner container 11 is a polygonal container having a polygonal bottom 21, a body 22 formed in a triangular shape with corners 22c at the bottom 21, and a flange 23 having a polygonal top opening 23e with more corners than the bottom 21, resulting in a number of corners for the bottom 21 and the top opening 23e formed by the flange 23. Here, the top opening 23e formed by the flange 23 is, for example, the inner peripheral edge of the flange 23, and serves as the opening of the inner container 11. The number of corners for the top opening 23e formed by the flange 23 is, for example, twice the number of corners of the bottom 21. In this embodiment, the bottom 21 is quadrangular, for example, rectangular and long in one direction, and the top opening 23e formed by the flange 23 is octagonal and long in one direction. The bottom 21 has three or more corners, and the top opening 23e formed by the flange 23 only needs to have twice the number of corners of the bottom 21.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] Corner 22c is formed in a triangular shape, specifically an isosceles triangle shape with the vertex on the bottom 21 side. Here, an isosceles triangle shape also includes an equilateral triangle shape. Corner 22c has its apex angle on the bottom 21 side and its base on the flange 23 side. The isosceles sides of corner 22c are continuous with side fold-in portions 22d.

[0020] The side fold-in portions 22d are formed in a triangular shape. The side fold-in portions 22d are integrally formed on both sides of the corners 22c in the circumferential direction of the body portion 22, and are formed by folding back portions. Specifically, two side fold-in portions 22d are provided for each corner 22c, and two side fold-in portions 22d are provided, one on each side of the corner 22c in the circumferential direction of the body portion 22. The side fold-in portions 22d are doubled by being folded back at the center, and are continuous with each side portion 22a and corner 22c. Specifically, one of the two side fold-in portions 22d is continuous with the first side portion 22a and corner 22c, and the other of the two side fold-in portions 22d is continuous with the second side portion 22b and corner 22c. The side fold-in portion 22d is folded in half along a fold line formed at the center of the side fold-in portion 22d in the alignment direction of the first side portion 22a or the second side portion 22b and the side fold-in portion 22d. That is, by folding the side fold-in portion 22d in half, the corner 22c can be disposed between the first side portion 22a and the second side portion 22b, and the first side portion 22a and the corner 22c are connected, as well as the second side portion 22b and the corner 22c. Furthermore, by folding the side fold-in portion 22d in half, the two side fold-in portions 22d connected to one corner 22c are arranged opposite the first side portion 22a and the second side portion 22b, respectively.

[0021] Specifically, side fold portion 22d has inner piece 22d1 having a triangular shape, for example, a right-angled triangle, that is continuous with first side portion 22a or second side portion 22b, and outer piece 22d2 having a triangular shape, for example, a right-angled triangle, that is continuous with corner 22c. By folding along the boundary between inner piece 22d1 and outer piece 22d2 as a folding line, inner piece 22d1 and outer piece 22d2 are folded back, forming side fold portion 22d that is triangular, for example, double-layered and has a right-angled triangle shape.

[0022] The flange portion 23 is formed in a rectangular frame shape. 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 a pair of first flange pieces 23a, a pair of second flange pieces 23b, four corner flange pieces 23c, and eight fixing pieces 23d, which are integrally formed, for example, by bonding. Here, the pair of first flange pieces 23a and the pair of second flange pieces 23b constitute the four sides of the rectangular frame-shaped flange portion 23.

[0023] 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 piece 23c. The first flange piece 23a is folded in half along a fold line along the longitudinal direction to sandwich and fix a part of the external member 12. 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 formed by folding along the boundary along the longitudinal direction between the first upper piece 23a1 and the first lower piece 23a2, forming a fold line. 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.

[0024] 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 longer than the second side portion 22b. The second flange piece 23b is folded in half along a fold line along the longitudinal direction to sandwich and fix a portion of the external member 12. 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. Note that the second flange piece 23b has a different longitudinal length from the first flange piece 23a, for example, but is formed to have the same shape as the first flange piece 23a in all other respects except for the longitudinal length. The corners of the second upper piece 23b1 are inclined relative to the longitudinal direction on both the second side 22b and the second lower piece 23b2, with their tips at the apex. The inclination angle of the second upper piece 23b1 is set to an angle that places it within the area of ​​the angular flange piece 23c. The ends of the second lower piece 23b2 are inclined in a direction that shortens their length, with their tips extending outward from the second upper piece 23b1 in the short direction. As a result, the ends of the second lower piece 23b2 are not positioned between the upper surface of the third lower piece 23c1 (described later) of the angular flange piece 23c and the lower surface of the third upper piece 23c2, but rather abut against the lower surface of the third lower piece 23c1. As a result, both ends of the second upper piece 23b1 are sandwiched and fixed between the angular flange piece 23c, while both ends of the second lower piece 23b2 are not sandwiched between the angular flange piece 23c.

[0025] The corner flange piece 23c is integrally formed on the opposite side of the corner portion 22c from the bottom portion 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, thereby sandwiching and fixing the first upper piece 23a1 of the first flange piece 23a and the second upper piece 23b1 of the second flange piece 23b. The corner flange piece 23c includes, for example, a third lower piece 23c1 that forms the underside and is continuous with the corner portion 22c, and a third upper piece 23c2 that is continuous with the third lower piece 23c1. The corner flange piece 23c that forms the corner of the flange portion 23 is formed by folding the third lower piece 23c1 and the third upper piece 23c2 along the 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. 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, so that the flange portion 23 has a rectangular frame shape with linearly inclined corners.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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 33c. The side wall portion 33 is formed integrally with the leg portion 32 and continuous therewith.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] As shown in Fig. 1, the lid 3 is formed, for example, in a sheet shape. The lid 3 is a so-called top seal. 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In the rectangular paper container 2 and content-filled container 1 configured as described above, the bottom 21 of the inner container 11 is polygonal, or quadrangular in this embodiment, and the top opening 23e formed by the flange 23 is polygonal with more corners than the bottom 21, or octagonal in this embodiment, with twice the number of corners of the bottom 21. The body 22 has a triangular corner 22c with its apex pointing downward, and the side folds 22a and 22b of the body 22 are connected to the corner 22c by a side fold 22d folded back at the center. This inner container 11 has a symmetrical shape. This configuration allows the top opening 23e formed by the bottom 21 and flange 23 to have different polygonal shapes, and improves the strength of the corners of the body 22, thereby increasing the overall strength of the inner container 11. Therefore, the inner container 11 is less likely to bend. As described above, the rectangular paper container 2 and content-filled container 1 can improve their strength by the shape of the inner container 11. Furthermore, by making the number of corners of the top surface opening 23e formed by the flange portion 23 twice the number of corners of the bottom portion 21, the strength is higher than a shape in which the top surface opening 23e formed by the flange portion 23 and the bottom 21 have the same number of corners. Furthermore, by making the bottom 21 quadrangular and making the top surface opening 23e formed by the flange portion 23 octagonal, the strength can be improved compared to combinations of other numbers of corners. In this embodiment, the outer peripheral edge of the flange portion 23 is octagonal, the same shape as the top surface opening 23e (the inner peripheral edge of the flange portion 23), but the present invention is not limited to this.

[0047] Furthermore, since the rectangular paper container 2 is configured such that a part of the outer member 12 is sandwiched and fixed to a part of the inner container 11, the outer member 12 can be prevented from coming off the inner container 11.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 is 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.

[0052] 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.

[0053] 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.

[0054] As described above, according to the square paper container 2 and the content-filled container 1 using the square paper container 2 of one embodiment of the present invention, the outer member 12 can be sandwiched between a part of the inner container 11, thereby preventing the outer member 12 from coming off the inner container 11.

[0055] 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.

[0056] In the above example, the outer member 12 has the fixing piece 33c, but this is not limiting and the outer member 12 may not have the fixing piece 33c. When the first side wall portion 33a and the second side wall portion 33b of such an outer member 12 are fixed to the corresponding multiple side folded portions 22d of the inner container 11, the rectangular paper container 2 is formed.

[0057] 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.

[0058] In the above example, the inner container 11 of the rectangular paper container 2 has a polygonal bottom 21 and a flange 23 with a polygonal top opening 23e having more corners than the bottom 21. The example described above has a rectangular bottom 21 and an octagonal top opening 23e. However, the bottom 21 may have a shape of at least one triangle, and the top opening 23e may have a shape of at least one hexagon. Next, FIGS. 10 and 11 illustrate an example of an inner container 11 used in a rectangular paper container 2 of a content-filled container 1 according to a second embodiment, in which the bottom 21 is pentagonal and the top opening 23e is decagonal. In the example of the second embodiment shown in FIGS. 10 and 11, components similar to those of the inner container 11 of the content-filled container 1 according to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0059] As shown in Figure 10, the inner container 11 of the rectangular paper container 2 comprises a bottom 21, a body 22, and a flange 23. The inner container 11 is formed into a rectangular shape, for example, with the body 22 gradually becoming wider from the bottom 21 side toward the flange 23. The inner container 11 is a polygonal container with a pentagonal bottom 21, a body 22 formed in a triangular shape with corners 22c becoming the apex on the bottom 21 side, and a flange 23 formed with a top opening 23e in a decagonal shape that has more corners than the bottom 21, so that the number of corners of the bottom 21 and the number of corners of the top opening 23e formed by the flange 23 differ.

[0060] The bottom 21 is formed in the shape of a regular pentagonal plate. Note that the bottom 21 does not have to be a regular pentagon, and may be a pentagon with different angles.

[0061] The body 22 has five side portions 22a, five corner portions 22c arranged between adjacent side portions 22a, and a pair of side fold portions 22d provided at each of the five corner portions 22c and extending to two side portions 22a adjacent to the corner portion 22c in the circumferential direction.

[0062] 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, for example, with five side portions 22a and five corner portions 22c sloping outward from the bottom 21 side toward the flange 23 side. In other words, the side surfaces of the body 22 are sloping so that the inner shape of the flange 23 side is larger than that of the bottom 21 side. That is, the body 22 is formed in a cylindrical shape with a pentagonal shape on the bottom 21 side and a decagonal shape on the flange 23 side.

[0063] The five side portions 22a, the five corner portions 22c, and the ten side fold-in portions 22d are integrally formed. In addition, the five side portions 22a, the five corner portions 22c, and the ten side fold-in portions 22d are integrally formed with the bottom portion 21.

[0064] The side portion 22a is formed, for example, in a rectangular shape, but may also be a quadrilateral shape such as a square or trapezoid. One of the pair of long sides of the 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 side portion 22a are continuous with the side fold-in portions 22d.

[0065] Corner portion 22c is formed in a triangular shape, specifically, an isosceles triangle shape including an equilateral triangle shape with the apex facing bottom portion 21. Corner portion 22c has its apex angle facing bottom portion 21 and its base facing flange portion 23. The isosceles of corner portion 22c are continuous with side fold-in portion 22d.

[0066] The side fold-in portions 22d are formed in a triangular shape. The side fold-in portions 22d are integrally formed on both sides of the corners 22c in the circumferential direction of the body portion 22, and are formed by folding back portions. Specifically, two side fold-in portions 22d are provided for each corner 22c, and two side fold-in portions 22d are provided, one on each side of the corner 22c in the circumferential direction of the body portion 22. The side fold-in portions 22d are doubled by being folded back at the center, and are continuous with each side portion 22a and the corners 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 side portions 22a and the side fold-in portions 22d. That is, by folding side surface fold-in portion 22d in half, corner portion 22c can be arranged between adjacent side portions 22a, and side portions 22a and corner portion 22c are continuous. Furthermore, by folding side surface fold-in portion 22d in half, two side surface fold-in portions 22d continuous with one corner portion 22c are arranged opposite two side portions 22a, respectively.

[0067] Specifically, side fold portion 22d has inner piece 22d1 having a triangular shape, for example, a right-angled triangle, that is continuous with side portion 22a, and outer piece 22d2 having a triangular shape, for example, a right-angled triangle, that is continuous with corner 22c. By folding along the boundary between inner piece 22d1 and outer piece 22d2 as a folding line, inner piece 22d1 and outer piece 22d2 are folded back, forming side fold portion 22d that is triangular, for example, double-layered and has a right-angled triangle shape.

[0068] The flange portion 23 is formed in a decagonal frame shape. The flange portion 23 extends, for example, in the same direction as the in-plane direction of the main surface of the bottom portion 21. The flange portion 23 has five flange pieces 23a, five corner flange pieces 23c, and ten fixing pieces 23d, which are integrally formed, for example, by bonding. Here, the flange pieces 23a constitute five sides of the decagonal frame-shaped flange portion 23, and each flange piece 23c is positioned between adjacent flange pieces 23a and is shorter than the flange pieces 23a, constituting the remaining five sides of the decagonal frame-shaped flange portion 23.

[0069] The flange piece 23a is integrally formed on the long side of the side portion 22a opposite the bottom portion 21. The flange piece 23a is formed longer than the side portion 22a, and both ends are stacked and fixed to the angular flange piece 23c. The flange piece 23a is folded in half along a fold line along the longitudinal direction to sandwich and fix a part of the external member 12. The flange piece 23a has, for example, an upper piece 23a1 that forms the upper surface and is continuous with the side portion 22a, and a lower piece 23a2 that is continuous with the upper piece 23a1. The flange piece 23a is formed by folding along the boundary along the longitudinal direction between the upper piece 23a1 and the lower piece 23a2. In addition, both ends of the upper piece 23a1 are inclined with respect to the longitudinal direction, on both the side portion 22a side and the lower piece 23a2 side, so that the tip becomes the apex. The inclination angle of the upper piece 23a1 is set to an angle that allows it to be positioned within the area of ​​the angular flange piece 23c. Both ends of the lower piece 23a2 are inclined so that their tips become shorter as they extend outward from the upper piece 23a1. As a result, the end of the lower piece 23a2 is not positioned between the upper surface of the third lower piece 23c1 (described below) 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 upper piece 23a1 are sandwiched and fixed between the angular flange piece 23c, while both ends of the lower piece 23a2 are not sandwiched between the angular flange piece 23c.

[0070] The corner flange piece 23c is integrally formed on the opposite side of the corner portion 22c from the bottom portion 21. The corner flange piece 23c is folded in half, for example, along a fold line inclined relative to the longitudinal direction of the flange piece 23a, thereby sandwiching and securing the upper pieces 23a1 of the adjacent flange pieces 23a. The corner flange piece 23c has, for example, a lower piece 23c1 that forms the underside and is continuous with the corner portion 22c, and a third upper piece 23c2 that is continuous with the third lower piece 23c1. The corner flange piece 23c that forms the corner of the flange portion 23 is formed by folding along the fold line between the third lower piece 23c1 and the third upper piece 23c2, which is inclined relative to the longitudinal direction of the flange piece 23a. For example, the third lower piece 23c1 and the third upper piece 23c2 are formed in a shape that forms the short sides of the decagonal frame-shaped flange portion 23c, and are folded and overlapped to form the short sides of the flange portion 23c. In addition, the third lower piece 23c1 is formed continuously with the fixing piece 23d.

[0071] Fixing piece 23d is formed integrally with side fold-in portion 22d on the side opposite bottom portion 21. Fixing piece 23d is also formed integrally with third lower piece 23c1. Fixing piece 23d is folded back and positioned between stacked upper piece 23a1 and lower piece 23a2, and fixed to flange piece 23a.

[0072] The inner container 11 thus formed is assembled integrally with an outer container 12 having, for example, a pentagonal bottom 31. For example, the outer container 12 of the second embodiment includes a leg 32 having five legs 32a of the same configuration as the first legs 32a of the first embodiment but no second legs 32b, and a side wall 33 having five side walls 33a of the same configuration as the first side wall 33a of the first embodiment but no second side wall 33b.

[0073] Like the inner container 11 of the second embodiment configured in this manner, the number of corners can be appropriately adjusted as long as the inner container 11 has a polygonal bottom 21 and a flange portion 23 having an upper surface opening 23e formed in a polygonal shape with more corners than the bottom 21.

[0074] 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]

[0075] 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 (flange piece), 23c1...third lower piece, 23c2...third upper piece, 23d...fixed piece, 31...bottom, 32...leg, 32a...first leg, 32a1...inner leg, 32a2...outer leg, 32b...second Leg, 32b1...inner leg, 32b2...outer leg, 33...side wall, 33a...first side wall (side wall), 33b...second side wall (side wall), 33c...fixing piece, 33c1...first fixing piece, 33c2...second fixing piece, 111...blank, 112...blank.

Claims

1. a polygonal bottom; a polygonal body portion formed integrally with the bottom portion and having a triangular shape with corners that become vertices on the bottom side; an upper surface opening formed by a flange portion formed in a polygonal shape having more corners than the bottom; side fold-in portions integrally formed on both sides of the corner portions in the circumferential direction of the body portion; A square paper container comprising:

2. The rectangular paper container according to claim 1, wherein the number of corners of the top opening is twice the number of corners of the bottom.

3. The rectangular paper container according to claim 1, wherein the bottom is rectangular and the top opening is octagonal.

4. The square paper container according to any one of claims 1 to 3, Contents to be contained in the square paper container; A container containing a content.

5. a polygonal bottom; a plurality of rectangular side portions integrally formed on the bottom; a plurality of corner portions formed in a triangular shape with a vertex at the bottom side, the corner portions forming a body portion together with the plurality of side portions; a plurality of flange pieces that form an upper surface opening formed in a polygonal shape having a number of corners greater than that of the bottom; a plurality of side fold-in portions integrally formed on the side portions and the corner portions in the circumferential direction of the body portion; A blank for forming a rectangular paper container.

6. The bottom is rectangular in shape, The blank of claim 5, wherein the top opening has a pair of first flange pieces, a pair of second flange pieces, and four corner flange pieces that are bonded together to form an octagonal shape.

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