Rectangular paper containers, containers with contents, and blanks

Abstract

To provide a rectangular paper container, a container with contents, and a blank container that can suppress liquid leakage. [Solution] The rectangular paper container 2 according to the embodiment is a rectangular paper container 2 formed from a blank 111, comprising a bottom portion 21, a body portion 22 having corner portions 22c, and a flange portion 23 extending outward from the upper end of the body portion 22, and having no notches c on the extension of the ridge line l of the corner portion 22c and near the connection portion between the body portion 22 and the flange portion 23 in the flange portion 23.

Description

Technical Field

[0001] The present invention relates to a rectangular paper container, a container containing contents, and a blank.

Background Art

[0002] Conventionally, rectangular paper containers have been known as packaging containers for containing foods and the like. For example, a technique for forming a rectangular paper container by folding a blank formed of a paper base material is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above-described rectangular paper container is configured to be formed into a rectangular shape by folding a single blank. However, when a part of the body of the container is formed by overlapping the ends of the blank, gaps may occur at the folded portions. For example, in the technique of Patent Document 1, if a shift occurs in the overlapping of the first folding joint plate and the second folding joint plate, there is a risk of forming a through hole. Thus, when a rectangular paper container is formed by overlapping a part of the blank to form the container, a through hole may occur and there is a risk of liquid leakage.

[0005] Therefore, an object of the present invention is to provide a rectangular paper container, a container containing contents, and a blank that can suppress liquid leakage.

Means for Solving the Problems

[0006] According to one aspect of the present invention, a rectangular paper container is a rectangular paper container formed from a blank, comprising a bottom portion, a body portion having corners, and a flange portion extending outward from the upper end of the body portion, and having no notches on the extension of the ridge line of the corners and near the connection portion between the body portion and the flange portion in the flange portion. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a rectangular paper container, a container with contents, and a blank container that can suppress the leakage of liquid. [Brief explanation of the drawing]

[0008] [Figure 1] A perspective view showing the configuration of a container containing contents according to an embodiment of the present invention. [Figure 2] A perspective view showing the structure of a rectangular paper container containing the same contents. [Figure 3] A perspective view showing the inner container of a rectangular paper container. [Figure 4] A perspective view showing the configuration of the outer components of a rectangular paper container. [Figure 5] Plan view showing the blank of the same inner container. [Figure 6] An explanatory diagram showing the cut lines and crease lines on the blank of the same inner container. [Figure 7] A plan view showing the blank of the external component. [Figure 8] A perspective view showing an example of a manufacturing method for the same inner container. [Figure 9] An explanatory diagram showing the results of evaluation tests using the inner containers of the example and the inner containers of the comparative example. [Modes for carrying out the invention]

[0009] Hereinafter, the configuration of the contents-filled container 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 8. Figure 1 is a perspective view showing the configuration of a contents-filled container 1 according to an embodiment of the present invention, Figure 2 is a perspective view showing the configuration of a rectangular paper container 2 of the contents-filled container 1, and Figure 3 is a perspective view showing the inner container 11 of the rectangular paper container 2. Figure 4 is a perspective view showing the configuration of the outer member 12 of the rectangular paper container 2. Figure 5 is a plan view showing the configuration of the blank 111 of the inner container 11, and Figure 6 is an explanatory diagram showing the cut line c and crease line l in the main configuration of the blank 111 of the inner container 11. Figure 7 is a plan view showing the configuration of the blank 112 of the outer member 12. Figure 8 is a perspective view showing one of the folding processes of the blank 111 as an example of a manufacturing method for the inner container 11.

[0010] As shown in Figures 1 to 4, the container 1 containing contents comprises a rectangular paper container 2, a lid 3 that seals the rectangular paper container 2, and contents 4 contained in the rectangular paper container 2. As shown in Figure 1, the container 1 containing contents is formed when the rectangular paper container 2 is sealed with the lid 3 while the contents 4 are contained inside the rectangular paper container 2. Here, the contents 4 may include, for example, foods that are cooked by boiling water or heating in a microwave, such as instant noodles, room temperature or refrigerated items such as bento boxes, and refrigerated items such as salads.

[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 a single shape by sandwiching and fixing a part of the outer member 12 into a part of the inner container 11. For example, the rectangular paper container 2 is formed by fixing the outer member 12 to the inner container 11 by adhesive while the outer member 12 is sandwiched between a part of the inner container 11. The inner container 11 and outer member 12 of the rectangular paper container 2 are made of paper material. Here, paper material is a material containing 51% or more paper by weight. Paper material may contain resin or metal as part of its composition. The inner container 11 and outer member 12 are formed by folding and shaping a single blank 111, 112 formed from a paper substrate made of paper material by die-cutting or the like, and then bonding them together. Here, bonding may include welding, which heat-seals a seal layer made of resin material formed on the paper substrate, and bonding with adhesive. The fixing of the inner container 11 and the outer member 12 may include welding, bonding with adhesive, and fixing by sandwiching, which involves heat sealing a seal layer formed of a resin material formed on a paper substrate. The rectangular paper container 2 may be formed only from the inner container 11 and may not have an outer member 12. In addition, crease lines l and cut lines c are formed on the blanks 111 and 112 to define the folds and outer shape. Here, the crease line l is a fold line (non-cut portion), and the cut line c is a linearly cut portion.

[0012] As shown in Figures 1 to 3, the inner container 11 comprises a bottom (first bottom) 21, a body 22, and a flange 23. The inner container 11 is formed in a rectangular shape, for example, in which the width of the body 22 gradually increases from the bottom 21 side toward the flange 23.

[0013] The base portion 21 is formed in the shape of a rectangular plate. Specifically, the base portion 21 is formed in a rectangular shape with its four corners beveled and inclined, making it a beveled quadrilateral, but from a different viewpoint it is an octagon. The base portion 21 is formed integrally with the lower end of the body portion 22. The base portion 21 is formed in the shape of a rectangle, for example, where one direction is longer than the other direction perpendicular to that direction.

[0014] The body portion 22 includes a pair of first side portions 22a, a pair of second side portions 22b whose width in a direction along the circumferential direction of the body portion 22 is smaller than that of the first side portions 22a, four corner portions 22c disposed between the first side portions 22a and the second side portions 22b, and a pair of side folding portions (folding portions) 22d provided at each of the four corner portions 22c and extending to the first side portions 22a and the second side portions 22b, respectively.

[0015] The lower end of the body portion 22 is closed by the bottom portion 21, and the upper end is open. The body portion 22 is formed, for example, in a tapered shape in which a pair of first side portions 22a, a pair of second side portions 22b, and the corner portions 22c incline outward from the bottom portion 21 side toward the flange portion 23 side. In other words, the side surface of the body portion 22 inclines such that the inner shape on the flange portion 23 side is larger than that on the bottom portion 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 folding portions 22d are integrally formed. Also, the pair of first side portions 22a, the pair of second side portions 22b, the four corner portions 22c, and the eight side folding portions 22d are integrally formed with the bottom portion 21.

[0017] The first side portion 22a is formed in a rectangular shape. One of the 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 folding portion 22d.

[0018] The second side portion 22b is formed in a rectangular shape. One of the 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 folding portion 22d.

[0019] The corner portion 22c is formed in a triangular or quadrilateral shape, specifically as a trapezoid where the width on the base portion 21 side is smaller than the width on the flange portion 23 side, and the two sloping sides are equal. If the corners of the base portion 21 are formed in a rectangular shape without chamfering, the corner portion 22c is formed in an isosceles triangle shape, for example, with the apex angle on the base portion 21 side and the base on the flange portion 23 side. Note that the two sides of the corner portion 22c do not have to be equal; in this case, the triangular corner portion 22c will be a triangle other than an isosceles triangle, and the quadrilateral corner portion 22c will be a quadrilateral other than a trapezoid. The shorter side of 22c is continuous with the base portion 21, the longer side is continuous with the flange portion 23, and the two sloping sides are continuous with the side folded portion 22d.

[0020] The side fold portions 22d are formed in a triangular or square shape. Two side fold portions 22d are provided for each corner portion 22c, and the two side fold portions 22d are provided one on each side of the corner portion 22c in the circumferential direction of the body portion 22. One of the two side fold portions 22d is continuous with the first side portion 22a and the corner portion 22c, and the other side fold portion 22d is continuous with the second side portion 22b and the corner portion 22c. The side fold portion 22d is folded in half along the crease line l formed in the center of the side fold portion 22d in the direction in which the first side portion 22a or the second side portion 22b and the side fold portion 22d are aligned. In other words, when the side folding portion 22d is folded in half, a corner portion 22c can be positioned between the first side portion 22a and the second side portion 22b, and the first side portion 22a and corner portion 22c, as well as the second side portion 22b and corner portion 22c, are continuous. Also, when the side folding portion 22d is folded in half, the two side folding portions 22d that are continuous with one corner portion 22c are positioned opposite the first side portion 22a and the second side portion 22b, respectively.

[0021] Specifically, the side folded portion 22d has an inner piece 22d1 that is continuous with the first side portion 22a or the second side portion 22b, and an outer piece 22d2 that is continuous with the corner portion 22c, and is triangular in shape, for example, a right triangle, and is triangular in shape, for example, a right triangle. By folding along the crease line l formed at the boundary between the inner piece 22d1 and the outer piece 22d2, a double-layered side folded portion 22d in a triangular shape, for example, a right triangle, is formed. Furthermore, the crease line l of the side folded portion 22d becomes the edge of the side folded portion 22d when folded.

[0022] The flange portion 23 is formed in a rectangular frame shape. The flange portion 23 extends, for example, along the same direction as the in-plane direction of the main surface of the bottom portion 21. The flange portion 23 extends outward from the upper end of the body portion 22. 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 23d, which are integrally formed 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 to the bottom portion 21. The first flange piece 23a is formed to be longer than the length of the first side portion 22a, and both ends are laminated and fixed to the corner flange piece 23c. The first flange piece 23a is folded in half along a crease line l along the longitudinal direction, thereby sandwiching and fixing a part of the outer member 12. The first flange piece 23a has, for example, a first upper piece (upper piece) 23a1 that forms the upper surface and is continuous with the first side portion 22a, and a first lower piece (lower piece) 23a2 that is continuous with the first upper piece 23a1. The first flange piece 23a is formed to be longer in one direction by folding along a crease line l provided at the boundary between the first upper piece 23a1 and the first lower piece 23a2 along the longitudinal direction.

[0024] In addition, both ends of the first upper piece 23a1 are formed in a shape where the outer edge of the tip is along the outer edge of the corner flange piece 23c. The width of the end in the short direction of the first upper piece 23a1 is shorter than the width other than the end, and it is formed at a distance from the body portion 22. In the following description, the end of the first upper piece 23a1 may also be described as the claw portion 23a3. Further, the end (claw portion 23a3) of the first upper piece 23a1 is adjacent to the end (claw portion 23b3 to be described later) of the second upper piece 23b1 of the second flange piece 23b without a gap or with a predetermined gap. Here, as shown in FIG. 6, the gap T between the end of the first upper piece 23a1 and the end of the second upper piece 23b1 is set to be not more than the width W of the continuous portion 23c3 of the corner flange piece 23c to be described later (0≦T<W). That is, the opposing ends of the first upper piece 23a1 and the second upper piece 23b1 face the corner flange piece 23c. Further, for example, the end of the first upper piece 23a1 extends in the longitudinal direction of the first upper piece 23a1 to the position where the inner piece 22d1 is provided, is separated from the inner piece 22d1, and between the inner piece 22d1 and the first fixing piece 23d1 of the fixing piece 23d to be described later is arranged.

[0025] Both ends of the first lower piece 23a2 are inclined such that the tip inclines in a direction where the length becomes shorter outward from the first upper piece 23a1. As a result, the ends of the first lower piece 23a2 are not arranged between the upper surface of the third lower piece 23c1 and the lower surface of the third upper piece 23c2 of the corner flange piece 23c to be described later, but abut on the lower surface of the third lower piece 23c1. Thereby, both ends of the first upper piece 23a1 are sandwiched and fixed by the corner flange piece 23c, and both ends of the first lower piece 23a2 are not sandwiched by the corner flange piece 23c. The longitudinal length of the first lower piece 23a2 is longer than the longitudinal length to the claw portion 23a3 of the first upper piece 23a1 and the longitudinal length to the portion covered by the corner flange piece 23c of the first upper piece 23a1. Further, the first lower piece 23a2 covers a part of the lower surface of the corner flange piece 23c. Further, the width (length in the short direction) W2 of the first lower piece 23a2 is larger than the width (length in the short direction) W1 of the first upper piece 23a1.

[0026] The second flange piece 23b is integrally formed on the long side of the second side portion 22b opposite to the bottom portion 21. The second flange piece 23b is formed to be longer than the length of the second side portion 22b. The second flange piece 23b is folded in half along the crease line l that runs along the longitudinal direction, thereby sandwiching and fixing a part of the outer member 12.

[0027] The second flange piece 23b includes, for example, a second upper piece (upper piece) 23b1 that forms the upper surface and is continuous with the second side portion 22b, and a second lower piece (lower piece) 23b2 that is continuous with the second upper piece 23b1. The second flange piece 23b is formed by folding along a crease line l provided at the boundary between the second upper piece 23b1 and the second lower piece 23b2 along their longitudinal directions, thereby creating a second flange piece 23b that is elongated in one direction.

[0028] The second flange piece 23b, for example, has a different length in the longitudinal direction from the first flange piece 23a, but its shape other than the length in the longitudinal direction is the same as that of the first flange piece 23a. In addition, both ends of the second upper piece 23b1 are formed so that the outer edge of the tip follows the outer edge of the corner flange piece 23c, and the width of the end of the second upper piece 23b1 in the short direction is shorter than the width of the other parts, and it is formed spaced apart from the body 22. In the following description, the end of the second upper piece 23b1 may also be described as the claw portion 23b3. For example, the end of the second upper piece 23b1 (claw portion 23b3) extends in the longitudinal direction of the second upper piece 23b1 to the position where the inner piece 22d1 is provided, and is spaced apart from the inner piece 22d1, and the first fixing piece 23d1 of the fixing piece 23d, which will be described later, is positioned between the end of the second upper piece 23b1 and the inner piece 22d1.

[0029] Both ends of the second lower piece 23b2 are inclined in a direction that shortens in length, with the tips of the second upper piece 23b1 moving outward in the shorter 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 and the lower surface of the third upper piece 23c2 of the corner flange piece 23c (described later), 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 by the corner flange piece 23c, while both ends of the second lower piece 23b2 are not sandwiched by the corner flange piece 23c. The longitudinal length of the second lower piece 23b2 is longer than the longitudinal length of the second upper piece 23b1 up to the claw portion 23b3, and the length of the second upper piece 23b1 up to the portion covered by the corner flange piece 23c. Furthermore, the second lower piece 23b2 covers a portion of the lower surface of the corner flange piece 23c. Also, the width (length in the shorter direction) W2 of the second lower piece 23b2 is greater than the width (length in the shorter direction) W1 of the second upper piece 23b1.

[0030] The corner flange piece 23c is integrally formed on the side of the corner 22c opposite to the bottom 21. The corner flange piece 23c is folded in half along the continuous portion 23c3, for example, to sandwich and fix the first upper piece 23a1 of the first flange piece 23a and the second upper piece 23b1 of the second flange piece 23b at its outer edge. The corner flange piece 23c has, for example, a third lower piece (corner lower piece) 23c1 that is continuous with the corner 22c and forms the bottom surface, and a third upper piece (corner upper piece) 23c2 that is integrally connected to the third lower piece 23c1 via the continuous portion 23c3. Then, the third lower piece 23c1 and the third upper piece 23c2 are folded along the crease line l provided at the boundary that slopes with respect to both the longitudinal direction of the first flange piece 23a and the longitudinal direction of the second flange piece 23b, thereby forming the corner flange piece 23c that forms the corner of the flange portion 23. Also, as shown in Figure 6, since the width W of the continuous portion 23c3 is larger than the gap T between the adjacent first upper piece 23a1 and the second upper piece 23b1, the claw portions 23a3 and 23b3 are sandwiched between the third lower piece 23c1 and the third upper piece 23c2 and bonded together, thereby fluidly closing the gap T between the first upper piece 23a1 and the second upper piece 23b1.

[0031] The fixing piece 23d is formed integrally with the side of the folded portion 22d, for example, on the side opposite to the bottom portion 21. In other words, the fixing piece 23d is provided at the upper end of the folded portion 22d. The fixing piece 23d is folded in a direction intersecting the extending direction of the folded portion 22d and is sandwiched and fixed between the first upper piece 23a1 and the first lower piece 23a2, which are part of the flange portion 23, and between the second upper piece 23b1 and the second lower piece 23b2, thereby forming part of the flange portion 23.

[0032] The fixing piece 23d is formed, for example, elongated in one direction, longer than the side of the side folded portion 22d opposite the bottom portion 21, and protruding on the side opposite the corner flange piece 23c. Furthermore, the length of the fixing piece 23d in the direction perpendicular to the longitudinal direction is formed to be shorter than the length of the first upper piece 23a1, the length of the first lower piece 23a2, the length of the second upper piece 23b1, and the length of the second lower piece 23b2. Thus, the fixing piece 23d is positioned between the folded and stacked first upper piece 23a1 and first lower piece 23a2, and between the second upper piece 23b1 and second lower piece 23b2, and is fixed to the first flange piece 23a and second flange piece 23b. In addition, the inner surfaces of the folded fixing piece 23d are bonded together.

[0033] As a specific example, the fixing piece 23d comprises a first fixing piece 23d1 that is continuous with the side of the inner piece 22d1 of the side folding portion 22d that is opposite to the bottom 21 side, and a second fixing piece 23d2 that is continuous with the side of the outer piece 22d2 of the side folding portion 22d that is opposite to the bottom 21 side. When the fixing piece 23d is folded, the opposing inner surfaces of the first fixing piece 23d1 and the second fixing piece 23d2 are bonded together.

[0034] The first fixing piece 23d1 faces the claw portions 23a3 and 23b3 of the first upper piece 23a1 or the second upper piece 23b1 on the opposite side of the inner piece 22d1, in a portion of the width direction (longitudinal direction of the first fixing piece 23d1). Furthermore, on the side of the second fixing piece 23d2 in the longitudinal direction of the first fixing piece 23d1, the first fixing piece 23d1 faces the claw portions 23a3 and 23b3 in the longitudinal direction of the first fixing piece 23d1, but does not face the first upper piece 23a1 or the second upper piece 23b1 in the short direction of the first fixing piece 23d1.

[0035] For example, the first fixing piece 23d1 is continuous with the first upper piece 23a1 via a crease line l in the longitudinal direction of the first fixing piece 23d1, and discontinuous with the first upper piece 23a1 via a cut line c in the short direction of the first fixing piece 23d1. Also, the first fixing piece 23d1 is continuous with the second fixing piece 23d2 via a crease line l on the short direction side of the inner piece 22d1 and outer piece 22d2, and discontinuous with the side opposite to the inner piece 22d1 and outer piece 22d2 via a cut line c in the short direction. In other words, between the first fixing piece 23d1 and the second fixing piece 23d2, a crease line l (non-cut portion) and a cut line c (cut portion) are sequentially formed along the crease line l (ridge line) formed between the inner piece 22d1 and outer piece 22d2 of the side folded portion 22d.

[0036] The length of the second fixing piece 23d2 in the width direction (longitudinal direction of the second fixing piece 23d2) at the end side of the outer piece 22d2 that is continuous with the outer piece 22d2 via the crease line l gradually decreases outward from the crease line l that is continuous with the outer piece 22d2. Also, the second fixing piece 23d2 is continuous with the third lower piece 23c1 of the corner flange piece 23c on the outer piece 22d2 side via the crease line l, and becomes discontinuous with the third lower piece 23c1 at a position slightly separated from the outer piece 22d2 by the cut line c. For example, the rate of change in width of the portion of the second fixing piece 23d2 that is continuous with the third lower piece 23c1 and the crease line l is greater than the rate of change in width of the portion that is continuous with the third lower piece 23c1 and the cut line c. In other words, no cut line c is provided on the extension of the crease line l between the corner 22c and the side folded portion 22d of the body portion 22, and which is continuous with the crease line l between the corner 22c and the side folded portion 22d of the body portion 22. In other words, the length of the side of the corner 22c on the flange portion 23 side is shorter than the length of the side of the third lower piece 23c1 of the corner flange piece 23c on the body portion 22 side.

[0037] The inner container 11 configured in this way is formed, for example, by folding the blank (first blank) 111 of the inner container 11 shown in Figures 5 and 6 along the crease line l and gluing it together. For example, the blank 111 is formed by connecting a pair of first sides 22a, a pair of second sides 22b, four corners 22c, and eight side folds 22d around the bottom 21 in the order of first side 22a, side fold 22d, corner 22c, side fold 22d, second side 22b, side fold 22d, corner 22c, side fold 22d, first side 22a, side fold 22d, corner 22c, side fold 22d, and second side 22b.

[0038] Furthermore, 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 the four corners, and eight fixing pieces 23d to the eight side folded portions 22d. The blank 111 is formed by punching out a single sheet of paper substrate to form each element, creating indentations that form crease lines l at the boundaries of each element, and making cuts that form cut lines c. In addition, the blank 111 is formed from a paper substrate and has a seal layer made of resin material on the surface layer that will be the outer surface of the inner container 11. The inner container 11 is formed by bending the blank 111 and heat-sealing the seal layer provided on the outer surface layer. Note that the blank 111 may also be configured to form the inner container 11 by attaching it with an adhesive without having a seal layer.

[0039] As shown in Figures 1, 2, and 4, the outer member 12 comprises, for example, a bottom (second bottom) 31, leg portions 32, and side wall portions 33.

[0040] The bottom portion 31 is formed in the shape of a rectangular flat plate. The bottom portion 31 is formed integrally with the leg portion 32. The bottom portion 31 is formed in the shape of a rectangle in which one direction is longer than the other direction perpendicular to that direction. For example, the bottom portion 31 of the outer member 12 is formed in the same shape as the bottom portion 21 of the inner container 11, or in the shape of a rectangle in which the longitudinal and transverse directions are each slightly smaller than the bottom portion 21 of the inner container 11. For example, when the outer member 12 is fixed to the inner container 11, the bottom portion 31 is separated from the bottom portion 21 of the inner container 11 with a predetermined gap. The bottom portion 21 of the inner container 11 and the bottom portion 31 of the outer member 12 are separated by the dimensional relationship between the inner container 11 and the outer member 12, for example, by making the height of the side wall portion 33 of the outer member 12 higher than the height of the sides 22a and 22b of the inner container 11. Furthermore, in order to create a predetermined gap between the bottom 21 of the inner container 11 and the bottom 31 of the outer member 12, in addition to setting the height of the side wall portion 33 relative to the height of the side portions 22a and 22b, or by changing the dimensions and shape of the leg portion 32 itself, or the height from the lower end of the leg portion 32 to the bottom 31, a predetermined gap may be created between the bottom 21 and the bottom 31.

[0041] The legs 32 are integrally provided with the base 31 in a continuous manner. The legs 32 are formed along the edges of the inner container 11, with gaps between the edges. The legs 32 are formed to protrude from the outer surface of the base 31 opposite to the inner surface facing the inner container 11. The legs 32 comprises a pair of first legs 32a and a pair of second legs 32b, which have a smaller width in the direction along the outer edge of the base 31 than the pair of first legs 32a. The pair of first legs 32a are continuous with the long side of the base 31. The first legs 32a extend downward from the base 31 and, by being folded back, extend upward from the lower end. For example, the first legs 32a are formed by being folded along one or more crease lines l along the longitudinal direction of the first legs 32a.

[0042] A pair of second legs 32b are continuous with the short side of the base 31. The second legs 32b extend downward from the base 31 and, by being folded back, extend upward from the lower end. For example, the second legs 32b are formed by folding along one or more crease lines l along the longitudinal direction of the second legs 32b. The legs 32 are continuous with the base 31 for a pair of first legs 32a and a pair of second legs 32b, while adjacent first legs 32a and second legs 32b are formed discontinuously.

[0043] These pair of first legs 32a and pair of second legs 32b are deformable at least inward and elastically resilient. That is, the pair of first legs 32a and pair of second legs 32b are elastically deformable when an external force is applied from the outside to the inside, and are formed to be resilient when the application of the external force is removed. Furthermore, "the legs deform inward" includes deformation that bends inward and toward the bottom portion 31.

[0044] Here, the inside of a pair of first legs 32a (a pair of second legs 32b) is the direction in which the pair of first legs 32a (a pair of second legs 32b) face each other, or in other words, the side from one first leg 32a (a second leg 32b) toward the other first leg 32a (a second leg 32b). Also, the outside of a pair of first legs 32a (a pair of second legs 32b) is the direction opposite to the direction in which the pair of first legs 32a (a pair of second legs 32b) face each other, or in other words, the direction in which one first leg 32a (a second leg 32b) moves away from the other first leg 32a (a second leg 32b).

[0045] The side wall portion 33 comprises 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.

[0046] A pair of first side wall portions 33a are integrally formed and continuous with a pair of first leg portions 32a. The first side wall portions 33a are formed to be elongated in one direction, slightly shorter than the longitudinal length of the first side portion 22a, and longer than the distance between the two side folded portions 22d provided on the first side portion 22a in the longitudinal direction of the first side portion 22a. That is, when the first side wall portion 33a is positioned opposite the first side portion 22a, it is formed to be positioned and sandwiched between the two side folded portions 22d corresponding to the first side portion 22a and the first side portion 22a. For example, one of the first side wall portions 33a in the short direction is continuous with the first leg portion 32a, and a fixing piece 33c is formed on the other side. Furthermore, the first leg portion 32a and the first side wall portion 33a are formed such that, for example, the longitudinal length is longest at the portion where the first leg portion 32a and the first side wall portion 33a are continuous, and the longitudinal length of the first side wall portion 33a gradually decreases toward the fixing piece 33c side.

[0047] A pair of second side wall portions 33b are integrally formed and continuous with a pair of second leg portions 32b. The second side wall portions 33b are formed to be elongated in one direction, slightly shorter than the longitudinal length of the second side portion 22b, and longer than the distance between the two side folding portions 22d provided on the second side portion 22b in the longitudinal direction of the second side portion 22b. That is, when the second side wall portion 33b is positioned opposite the second side portion 22b, it is formed to be positioned and sandwiched between the two side folding portions 22d corresponding to the second side portion 22b and the second side portion 22b. For example, one of the shorter sides of the second side wall portion 33b is continuous with the second leg portion 32b, and a fixing piece 33c is formed on the other side. Furthermore, the second leg portion 32b and the second side wall portion 33b are formed such that, for example, the longitudinal length is longest at the portion where the second leg portion 32b and the second side wall portion 33b are continuous, and the longitudinal length of the second side wall portion 33b gradually decreases from the second leg portion 32b side toward the fixing piece 33c side.

[0048] The four fixing pieces 33c are provided on the upper edges of the pair of first sidewalls 33a and the pair of second sidewalls 33b. Of the four fixing pieces 33c, the pair of fixing pieces 33c that are integrally formed in a continuous manner with the pair of first sidewalls 33a will be referred to as the pair of first fixing pieces 33c1, and the pair of fixing pieces 33c that are integrally formed in a continuous manner with the pair of second sidewalls 33b will be referred to as the pair of second fixing pieces 33c2.

[0049] The first fixing piece 33c1 is formed to be elongated in one direction. The length of the first fixing piece 33c1 in the longitudinal direction is shorter than the distance between the two fixing pieces 23d provided on the two side folded portions 22d that are provided facing the first side portion 22a in the longitudinal direction of the first side portion 22a. In addition, the length of the first fixing piece 33c1 in the short direction perpendicular to the longitudinal direction is formed to be shorter than the length of the first upper piece 23a1 and the length of the first lower piece 23a2 in the short direction. As a result, the first fixing piece 33c1 is positioned together with the two fixing pieces 23d between the first upper piece 23a1 and the first lower piece 23a2, which are arranged side by side at both ends, folded back, and laminated, and is fixed to the first flange piece 23a by being bonded to the first upper piece 23a1 and the first lower piece 23a2.

[0050] The second fixing piece 33c2 is formed to be elongated in one direction. The length of the second fixing piece 33c2 in the longitudinal direction is shorter than the distance between the two fixing pieces 23d provided on the two side folded portions 22d that are provided facing the second side portion 22b in the longitudinal direction of the second side portion 22b. In addition, the length of the second fixing piece 33c2 in the short direction perpendicular to the longitudinal direction is formed to be shorter than the length of the second upper piece 23b1 and the length of the second lower piece 23b2 in the short direction. As a result, the second fixing piece 33c2 is positioned together with the two fixing pieces 23d between the second upper piece 23b1 and the second lower piece 23b2, which are arranged side by side at both ends, folded back, and laminated, and is fixed to the second flange piece 23b by being bonded to the second upper piece 23b1 and the second lower piece 23b2.

[0051] The outer member 12 configured in this way is formed, for example, by bending the blank (second blank) 112 of the outer member 12 shown in Figure 7. For example, the blank 112 is formed by integrally connecting a pair of first legs 32a and a pair of second legs 32b around the bottom 31. The blank 112 is also formed by integrally connecting a pair of first side walls 33a to a pair of first legs 32a, integrally connecting a pair of second side walls 33b to a pair of second legs 32b, integrally connecting a pair of first fixing pieces 33c1 to a pair of first side walls 33a, and integrally connecting a pair of second fixing pieces 33c2 to a pair of second side walls 33b.

[0052] Furthermore, the pair of first legs 32a and the pair of second legs 32b are formed to extend downward from the base 31 and each side wall 33a, 33b, and are bent along the crease line l to become continuous with the base 31 and each side wall 33a, 33b. In addition, the inner surfaces of the folded parts of the legs 32 are not adhered to each other and are separated, forming a gap. The shape of the legs 32 can be set in various appropriate ways, such as mountain-shaped, polygonal, or curved.

[0053] The blank 112 is constructed by punching out each element from a single sheet of paper substrate, and by creating indentations that form crease lines l at the boundaries between each element. Although the blank 112 is made of paper substrate, it does not have a sealing layer made of 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. However, the paper substrate forming the blank 112 may have a sealing layer made of resin material on its surface layer.

[0054] Furthermore, the outer member 12, for example, has a bottom 31, legs 32, and side walls 33 that are not adhered to the inner container 11. Also, since the outer member 12 has a bottom 31, legs 32, and side walls 33 integrally formed from a paper base blank 112, the legs 32 are not adhered to the bottom 31 and can be folded toward the bottom 31 when an external force is applied. Here, the external force is, for example, the shrinking force applied to the legs 32 by a shrinkable film (hereinafter referred to as "shrink film") such as a bag-shaped or strip-shaped shrink film that packages the container 1 containing contents when it is distributed as a product. Furthermore, the legs 32 return to their original shape due to the restorative force of the paper base when the application of the external force is released. Furthermore, since the legs 32 and side walls 33 of the outer member 12 are not adhered to the inner container 11, a gap is formed as the outer member 12 is separated from the lower edge of the inner container 11, i.e., from each side portion 22a, 22b.

[0055] As shown in Figure 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 a sealing layer made of a heat-sealable resin material on the surface facing the flange portion 23 of the inner container 11. For example, the base material of the lid 3 may be a resin material, paper material and / or metal material. The lid 3 seals the inner container 11 by heat-sealing it to the flange portion 23 of the inner container 11.

[0056] Next, an example of a method for manufacturing the rectangular paper container 2 configured in this way will be described. First, blanks 111 and 112 are formed from a paper substrate. Next, blanks 111 and 112 are folded to form shapes similar to the inner container 11 and outer member 12, respectively, in an unbonded state. As a specific example, first, the blank 111 of the inner container 11 shown in Figure 5 is folded along each crease line l, resulting in an inner container 11 that is not bonded, as shown in Figure 8. Next, 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, 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 the first upper piece 23a1, the second upper piece 23b1 and the corner flange pieces 23c are bonded and fixed in place.

[0057] At this time, the first lower piece 23a2 and the second lower piece 23b2 are not sandwiched between the corner flange piece 23c and extend downward. Then, as shown in Figure 4, the pair of first fixing pieces 33c1 and the pair of second fixing pieces 33c2 of the outer member 12, which have been bent and shaped, and the fixing pieces 23d provided on the eight side folded portions 22d of the inner container 11 are positioned 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, respectively. 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 as an ultrasonic seal. Furthermore, the method of bonding the first upper piece 23a1 and the first lower piece 23a2, and the second upper piece 23b1 and the second lower piece 23b2 is not limited to ultrasonic sealing, but may also be welding, which involves heat sealing a sealing layer formed of a resin material formed on a paper substrate, or bonding with an adhesive.

[0058] 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 facing 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 two corresponding side folding portions 22d and the first side portion 22a, and each second side wall portion 33b is sandwiched between the two corresponding side folding portions 22d and the second side portion 22b. 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 inner pieces 22d1 of the pair of first side portions 22a, the pair of second side portions 22b and / or the multiple side folding portions 22d.

[0059] However, if the pair of first sidewalls 33a and the pair of second sidewalls 33b are not bonded to the pair of first sides 22a and the pair of second sides 22b, a gap will be created between the pair of first sides 22a and the pair of second sides 22b and the pair of first sidewalls 33a and the pair of second sidewalls 33b, thus increasing the thermal insulation. For this reason, it is preferable that the pair of first sides 22a and the pair of second sides 22b are not bonded to the pair of first sidewalls 33a and the pair of second sidewalls 33b.

[0060] As a result, as shown in Figure 2, the inner container 11 and the outer component 12 are integrally formed, and a rectangular paper container 2 is manufactured. Multiple manufactured rectangular paper containers 2 are stacked vertically for storage and transport. The manufactured rectangular paper container 2 is filled with contents 4, the lid 3 is heat-sealed to the flange portion 23 of the rectangular paper container 2 as a top seal, and the container 1 with contents is manufactured by packaging it with a bag-shaped or strip-shaped shrink film as needed.

[0061] With the rectangular paper container 2 and the container 1 containing contents configured in this way, the width of the third lower piece 23c1 of the corner flange piece 23c on the body portion 22 side is made larger than the width of the corner portion 22c of the body portion 22 on the flange portion 23 side, and a cut line c continuous with the crease line l between the corner portion 22c of the body portion 22 and the side folded portion 22d is not provided. That is, since there is no cut on the extension of the ridge line (crease line l) between the corner portion 22c of the body portion 22 and the side folded portion 22d, and near the connection between the body portion 22 and the flange portion 23 in the flange portion 23 (i.e., near the crease line l at the upper end of the corner portion 22c), it is possible to suppress the formation of a through hole at the upper edge of the corner portion 22c. Therefore, it is possible to suppress the leakage of liquid contained in the body portion 22 to the outside.

[0062] Furthermore, since the fixing piece 23d is sandwiched between the upper pieces 23a1, 23b1 and lower pieces 23a2, 23b2 of the flange pieces 23a, 23b, the cut line c formed between the corner flange portion 23c and the fixing piece 23d is covered by the flange pieces 23a, 23b. As a result, the cut line c between each flange portion 23c and the fixing piece 23d is sealed, which further suppresses liquid leakage.

[0063] Furthermore, the ends (claw portions 23a3, 23b3) of each upper piece 23a1, 23b1 are sandwiched between the third lower piece 23c1 and the third upper piece 23c2 along the outer edge of the corner flange piece 23c. This maintains the strength of the corner flange piece 23c, thus preventing liquid leakage due to deformation of the corner flange piece 23c. In addition, by making the gap at the ends of each upper piece 23a1, 23b1 less than or equal to the width of the continuous section 23c3 that connects the third lower piece 23c1 and the third upper piece 23c2 of the corner flange piece 23cc, the continuous section 23c3 can seal the gap at the ends of each upper piece 23a1, 23b1. Therefore, even if liquid passes through the gap at the ends of each upper piece 23a1, 23b1, leakage of the liquid can be suppressed at the continuous section 23c3.

[0064] Furthermore, the width W2 of each lower piece 23a2, 23b2 is greater than the width W1 of the corresponding upper pieces 23a1, 23b1. As a result, each lower piece 23a2, 23b2 is bonded beyond the flange portion 23 to the outer surface of the body portion 22, for example, to each side portion 22a, 22b and / or side folded portion 22d. This allows the flange portion 23 to cover a portion of the outer surface of the body portion 22 as a safeguard in case of insufficient adhesion at the corner flange piece 23c.

[0065] Next, the evaluation test of the inner container 11 configured in this way and the results of the evaluation test will be explained below with reference to Figure 9.

[0066] (Evaluation test) As an evaluation test, liquid leakage was evaluated using the inner containers 11 of Examples 1 to 7, which used at least one of the following configurations 1 to 5, and the inner container of the comparative example which did not have configurations 1 to 5.

[0067] For the evaluation test, half the container capacity of the inner container 11 of Examples 1 to 7 and the inner container of the comparative example was filled with water, and a top seal film was heat-sealed to the flange portion 23 as a lid 3. In this evaluation test, water leakage from the boundary between the lid 3 and the flange portion 23 was not evaluated, so the lid was heat-sealed to the flange portion 23 using a tabletop sealer (NL-202JW-10, manufactured by Ishizaki Electric Works Co., Ltd.) in double-sided mode for the maximum heat-sealing time. At this time, heat sealing was performed in a way that prevented charring of the inner container 11. After heat sealing, it was allowed to cool naturally for about 3 minutes, and it was confirmed by touch that it had cooled to the same level as before heat sealing.

[0068] Next, the sealed inner container 11 was tilted at an angle of 100 to 105 degrees with its shorter side facing downwards, and left to stand for about 15 minutes. Then, with the shorter side positioned upwards facing downwards, it was tilted at an angle of 100 to 105 degrees, and left to stand for about 15 minutes. This allowed for visual confirmation of water leakage at the four corners of the inner container 11. Here, the corners of the inner container 11 refer to the corners including the corner 22c of the body 22, the side folded portion 22d, and the corner flange piece 23c of the flange portion 23. If water leakage occurred from the inner container 11, the number of leaking containers and the number of leaking corners were tallied and evaluated. If water leakage occurred between the lid 3 and the flange portion 23, the container was heat-sealed again, and if water leakage occurred again between the lid 3 and the flange portion 23, the inner container 11 was excluded from evaluation.

[0069] (Composition 1) The width W2 of the lower pieces 23a2 and 23b2 of each flange piece 23a and 23b is made larger than the width W1 of the upper pieces 23a1 and 23b1, and the lower pieces 23a2 and 23b2 are bonded to a part of the body 22.

[0070] If the inner container 11 does not have configuration 1, the width W2 of the lower pieces 23a2 and 23b2 shall be less than or equal to the width W1 of the upper pieces 23a1 and 23b1, and the lower pieces 23a2 and 23b2 shall not be bonded to a part of the body 22, or each flange piece 23a and 23b shall have upper pieces 23a1 and 23b1 but not lower pieces 23a2 and 23b2, or configuration 6 shall be used.

[0071] (Configuration 2) The width of the third lower piece 23c1 of the corner flange piece 23c on the body portion 22 side is made larger than the width of the corner portion 22c of the body portion 22 on the flange portion 23 side, and a cut line c continuous with the crease line l between the corner portion 22c of the body portion 22 and the side folded portion 22d is not provided.

[0072] In the case where the inner container 11 does not have configuration 2, a cut line c is provided between the second fixing piece 23d2 and the third lower piece 23c1, which is continuous with the crease line l between the corner 22c of the body portion 22 and the side folded portion 22d.

[0073] (Composition 3) A crease line l is provided between the first fixing piece 23d1 and the second fixing piece 23d2, which are located at the upper end of the side folded portion 22d, but no cut line c is provided. The fixing piece 23d is folded in a direction that intersects the side folded portion 22d, and the fixing piece 23d becomes part of the flange portion 23.

[0074] Furthermore, if the inner container 11 does not have configuration 3, it will not have configuration 5, and will not have the first fixing piece 23d1 of the fixing piece 23d, but will only have the second fixing piece 23d2.

[0075] (Composition 4) Claw portions 23a3 and 23b3 are provided at the ends of flange pieces 23a and 23b, and the claw portions 23a3 and 23b3 are sandwiched between the third lower piece 23c1 and the third upper piece 23c2 of the square flange piece 23c, so that the gap T between adjacent claw portions 23a3 and 23b3 is smaller than the width W of the continuous portion 23c3 of the square flange piece 23c.

[0076] If the inner container 11 does not have configuration 4, the flange pieces 23a and 23b will not have claw portions 23a3 and 23b3 at their ends.

[0077] (Composition 5) A crease line l is provided between the first fixing piece 23d1 and the second fixing piece 23d2, which are located at the upper end of the side folded portion 22d, and a cut line c is also provided. The fixing piece 23d is folded in a direction that intersects the side folded portion 22d, and the fixing piece 23d becomes part of the flange portion 23.

[0078] Furthermore, if the inner container 11 does not have configuration 5 and does not have configuration 3, the first fixing piece 23d1 of the fixing piece 23d is omitted, and only the second fixing piece 23d2 is present.

[0079] (Composition 6) Each flange piece 23a, 23b has upper pieces 23a1, 23b1 but no lower pieces 23a2, 23b2, or it has lower pieces 23a2, 23b2 but is not bonded to the upper pieces 23a1, 23b1.

[0080] (Example 1) The inner container 11 of Example 1 has the above-described configuration 1, but does not have configurations 2 to 5.

[0081] (Example 2) The inner container 11 of Example 2 has the above-described configuration 2, but does not have configurations 1 and 3 to 5. In the inner container 11 that does not have configuration 1, the width W2 of the lower pieces 23a2 and 23b2 is set to be less than or equal to the width W1 of the upper pieces 23a1 and 23b1, and the lower pieces 23a2 and 23b2 are not adhered to a part of the body 22.

[0082] (Example 3) The inner container 11 of Example 3 has the above-described configuration 3, but does not have configurations 1, 2, 4, and 5. In the inner container 11 that does not have configuration 1, the width W2 of the lower pieces 23a2 and 23b2 is set to be less than or equal to the width W1 of the upper pieces 23a1 and 23b1, and the lower pieces 23a2 and 23b2 are not adhered to a part of the body 22.

[0083] (Example 4) The inner container 11 of Example 4 has the above-described configurations 1 to 3, but does not have configurations 4 and 5.

[0084] (Example 5) The inner container 11 in Example 5 has the above-described configurations 1 to 4, but does not have configuration 5.

[0085] (Example 6) The inner container 11 of Example 6 has the above-described components 1, 2, 4, and 5, but does not have component 3.

[0086] (Example 7) The inner container 11 in Example 7 has the above-described configurations 2 and 4 to 6, but does not have configuration 3.

[0087] (Comparative example) The inner container was designed not to have any of the above configurations 1 to 5.

[0088] (Results of the evaluation test) Figure 9 shows the results of evaluation tests conducted using the inner container 11 from Examples 1 to 7 and the inner container of the comparative example. As shown in Figure 9, in the comparative example, when the number of tested containers was set to 8, leakage occurred in all 8 containers. That is, the leakage rate relative to the number of containers was 100%. Furthermore, of the 4 corners of the 8 containers (i.e., a total of 32 corners), leakage occurred in 27 corners, and the leakage rate relative to the number of corners was 84.4%.

[0089] In contrast, when the number of tests was set to eight, leakage occurred in all eight inner containers 11 of Example 1. However, out of the four corners of the eight inner containers (i.e., a total of 32 corners), leakage occurred in 22 corners. The leakage rate relative to the number of corners was 68.8%, indicating that the number of corners where leakage occurred was reduced compared to the inner container of the comparative example. This clearly demonstrates that configuration 1 has the effect of suppressing leakage.

[0090] In Example 2, when the number of tests was set to 24, leakage occurred in 4 of the inner containers 11, resulting in a leakage rate of 16.7% relative to the number of containers. Furthermore, of the 4 corners of the 24 inner containers (i.e., a total of 96 corners), leakage occurred in 7 corners, resulting in a leakage rate of 7.3% relative to the number of corners. This indicates that the number of corners where leakage occurred was reduced compared to the inner container of the comparative example. This clearly demonstrates that configuration 2 has a significant effect in suppressing leakage.

[0091] In Example 3, when the number of test containers was 23, leakage occurred in 2 of the containers 11, resulting in a leakage rate of 8.7% relative to the number of containers. Furthermore, of the 4 corners of the 23 containers (i.e., a total of 92 corners), leakage occurred in 4 corners, resulting in a leakage rate of 4.3% relative to the number of corners. This indicates that the number of corners where leakage occurred was reduced compared to the comparative example container. Thus, it became clear that configuration 3 has a significant effect in suppressing leakage.

[0092] In Example 4, when the number of tested containers was 24, leakage occurred in 2 of the containers, resulting in a leakage rate of 8.3% relative to the number of containers. Furthermore, of the 4 corners of the 24 containers (i.e., a total of 96 corners), leakage occurred in 2 corners, resulting in a leakage rate of 2.1% relative to the number of corners. This indicates that the number of corners where leakage occurred was reduced compared to the comparative example container. Thus, it was found that combining configurations 1 to 3 in the container 11 produced a significant effect in suppressing leakage, and that the leakage suppression effect was improved compared to applying any one of configurations 1 to 3 to the container 11.

[0093] In Example 5, when the number of tests was set to 40, leakage occurred in one inner container 11, resulting in a leakage rate of 2.5% relative to the number of containers. Furthermore, of the four corners of the 40 inner containers (i.e., a total of 160 corners), leakage occurred in 2 corners, resulting in a leakage rate of 1.3% relative to the number of corners. This indicates that the number of corners where leakage occurred was reduced compared to the inner container of the comparative example. In addition, the leakage suppression effect was improved compared to the inner container 11 of Example 5, making it clear that leakage can be further suppressed by combining components 1 to 4 in the inner container 11.

[0094] In Example 6, when the number of tests was set at 40, no inner containers 11 showed leakage. Therefore, it became clear that leakage can be prevented by combining configurations 1, 2, 4, and 5.

[0095] In Example 7, when the number of tests was set at 40, no inner containers 11 showed leakage. Therefore, it became clear that leakage can be prevented by combining configurations 2, 4, and 5.

[0096] As described above, with the rectangular paper container 2 and the container 1 containing contents using the rectangular paper container 2 according to the embodiment, even if the inner container 11 is formed by folding the blank 111, leakage of liquid can be suppressed.

[0097] In the example described above, the rectangular paper container 2 was described as having a rectangular base 21 that is longer in one direction, but it is not limited to this. That is, the shape of the base 21 of the rectangular paper container 2 is not limited to a rectangle; it may be a square or any other polygon. Also, in the example described, the base 21 is formed with beveled corners, but it is not limited to this; the base 21 does not have to have beveled corners.

[0098] Furthermore, in the example described above, the inner container 11 was configured such that each flange piece 23a, 23b has upper pieces 23a1, 23b1 and lower pieces 23a2, 23b2, but it is not limited to this configuration, and it may also be configured without lower pieces 23a2, 23b2.

[0099] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. [Explanation of Symbols]

[0100] 1...Container with contents, 2...Rectangular paper container, 3...Lid, 4...Contents, 11...Inner container, 12...Outer component, 21...Bottom (first bottom), 22...Body, 22a...First side (side), 22b...Second side (side), 22c...Corner, 22d...Side fold, 22d1...Inner piece, 22d2...Outer piece, 23...Flange, 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... Corner flange piece, 23c1...Third lower piece (corner lower piece), 23c2...Third upper piece (corner upper piece), 23d...Fixing piece, 23d1...First fixing piece, 23d2...Second fixing piece, 31...Bottom (second bottom), 32...Legs, 32a...First leg, 32b...Second 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 (first blank), 112...Blank (second blank), c...Cut line (cut portion), l...Crease line (non-cut portion).

Claims

1. A rectangular paper container formed from a blank, The bottom and, A body with corners, It comprises a flange portion extending outward from the upper end of the body portion, A rectangular paper container that does not have a notch on the extension of the ridge line of the corner portion and near the connection portion between the body portion and the flange portion in the flange portion.

2. The flange portion comprises a flange piece including an upper piece and a lower piece, a fixing piece integrally formed at the upper end of the corner portion, and a corner flange portion provided at the upper end of the corner portion, with a notch formed between it and the fixing piece. The rectangular paper container according to claim 1, wherein the notch between the fixing piece and the rectangular flange portion is covered by the upper piece and the lower piece.

3. The corner flange portion comprises a lower corner piece continuous with the body portion and an upper corner piece continuous with the lower corner piece via a connecting portion, The rectangular paper container according to claim 2, wherein the end of the upper piece of the flange portion is sandwiched between the lower piece of the corner portion and the upper piece on the outer edge side of the corner portion.

4. The rectangular paper container according to claim 3, wherein the width of the lower piece is greater than the width of the upper piece.

5. A rectangular paper container according to any one of claims 1 to 4, The contents contained in the aforementioned rectangular paper container, A container containing contents equipped with [a specific feature / feature].

6. A blank made of paper material to form a rectangular paper container, The bottom and, A body with corners, It comprises a flange portion extending outward from the upper end of the body portion, A blank that does not have a notch on the extension of the ridge line of the corner portion and near the connection portion between the body portion and the flange portion in the flange portion.

7. The flange portion comprises a flange piece including an upper piece and a lower piece, a fixing piece integrally formed at the upper end of the corner portion, and a corner flange portion provided at the upper end of the corner portion, with a notch formed between it and the fixing piece. The blank according to claim 6, wherein the notch between the fixing piece and the corner flange portion is covered by the upper piece and the lower piece.

8. The corner flange portion comprises a lower corner piece continuous with the body portion and an upper corner piece continuous with the lower corner piece via a connecting portion, The blank according to claim 7, wherein the end of the upper piece of the flange portion is sandwiched between the lower piece of the corner portion and the upper piece on the outer edge side of the corner portion.

9. The blank according to claim 8, wherein the width of the lower piece is greater than the width of the upper piece.

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