container

Abstract

To increase capacity of a container made of sheet-shaped members.SOLUTION: A container 20A made of sheet-shaped members has a bottom part 21 and a peripheral wall part 22 rising from the bottom part, and the peripheral wall part 22 has a flat part 23 formed flatly and a pleat-like part 24 formed by bending the peripheral wall part along a linear bent part extending in an upright direction of the peripheral wall part. In a state in which the peripheral wall part 22 is upright with respect to the bottom part 21, the pleat-like part 24 is formed to be higher than the flat part 23 in height from the bottom part and the length of the ridge line that defines the minimum height in the pleat-like part is set to be equal to or larger than the height of the flat part. Since the height position of the pleat-like part when the container is in use rises as a whole, the overflow position can be set to a height position closer to or higher than the height of the flat part. Since the overflow position rises, the amount of food etc. in liquid state to be stored can be increased.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a container made of a sheet-like material such as paper, plastic film, metal foil, or a laminate of these, and in particular to a container having a flat, planar portion on the peripheral wall and a pleated portion formed by folding the peripheral wall. [Background technology]

[0002] Figure 8 shows an example of a conventional container, where (A) is a plan view, (B) is a front view, and (C) is a right side view. Figure 9 is a plan view of a blank used to manufacture the conventional container. Figure 10 shows the peripheral wall of the container in Figure 8 in an upright position, where (A) is a plan view, (B) is a front view, and Figure 11 is an enlarged cross-sectional view along line YY in Figure 8.

[0003] Containers made of a sheet-like material such as paper, having a bottom and a peripheral wall, and an open top are widely used, for example, for storing food. For example, Patent Document 1 describes a container 53, as shown in Fig. 8, which is open at the top, has a bottom 54 and a peripheral wall 55 standing up from the bottom 54, and the peripheral wall 55 has a planar portion 56 formed flat and a pleated portion 57 formed by folding the peripheral wall 55 along a linear folding portion 55a extending in the direction in which the peripheral wall 55 stands up. Conventionally, such pleated containers are manufactured by a press molding method using a press molding device.

[0004] Container 53 of the shape shown in Fig. 8 is manufactured using blank 50, the outer periphery of which is a combination of arcuate portion 52a and straight portion 52b, as shown in Fig. 9. This blank 50 is set so that the distance d1 from the peripheral edge of portion 52 corresponding to the peripheral wall to portion 51 corresponding to the bottom is the same for arcuate portion 52a and straight portion 52b. Therefore, when peripheral wall portion 55 is upright relative to bottom portion 54 as shown in Fig. 10, the maximum height of pleated portion 57 is the same as the edge of flat portion 56. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 2700382 Summary of the Invention [Problem to be solved by the invention]

[0006] When container 53 is used to store items, etc., container 53 is usually used with peripheral wall 55 inclined outward to widen the opening on the top surface. In addition, pleated portion 57 is formed by bending peripheral wall 55 so as to protrude outward from flat portion 56. Therefore, when container 53 is in use, as shown in FIG. 11, when inner ridge 58a of pleated portion 57 and flat portion 56 are inclined at the same angle θ1, outer ridge 58b is further inclined by angle θ2 determined by the width of folding of peripheral wall 55. Therefore, the height of the edge of pleated portion 57 from bottom 54 is the same height h1 as flat portion 56 at upper end portion 57a ​​of inner ridge 58a, but is lower than h1 at upper end portion 57b of outer ridge 58b. The values ​​of heights h1 and h2 can be expressed as h1=d1·cosθ1 and h2=d1·cos(θ1+θ2) using the above angles θ1 and θ2, respectively, because the lengths of ridgelines 58a and 58b are both d1 due to the setting of blank 50 (see FIG. 9). Since 0°<θ1<θ1+θ2<90°, h1>h2.

[0007] Thus, conventional container 53 does not have a sufficient capacity for storing items because the edge of pleated portion 57 does not become higher than flat portion 56. In particular, when storing items with fluidity such as liquid food, upper end portion 57b of pleated portion 57, which is lower than flat portion 56, becomes the overflow position, which causes a problem that a sufficient capacity cannot be secured.

[0008] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to increase the capacity of a container having a peripheral wall with a flat portion and a pleated portion. [Means for solving the problem]

[0009] In order to achieve the above object, the invention described in claim 1 is a container manufactured by molding a blank made of a sheet-like material, the container having a bottom and a peripheral wall rising from the bottom, the peripheral wall having a planar portion formed flat and a pleated portion formed by folding the peripheral wall along a linear folding portion extending in the direction in which the peripheral wall rises, and in a state in which the peripheral wall is upright relative to the bottom, at least a part of the pleated portion is formed to be higher from the bottom than the planar portion, In the blank state, the edge of the pleated portion forming region, which is the region corresponding to the pleated portion, and the outer edge facing the edge of the pleated portion forming region in the bottom surface equivalent portion, which is the portion corresponding to the bottom, are formed in an arc shape, the position of the center of the arc-shaped portion in the pleated portion forming region is set outside the position of the center of the arc-shaped portion in the bottom surface equivalent portion, the center of the arc-shaped portion that is the edge of the pleated portion forming region is set to a point on the arc-shaped portion of the outer edge of the bottom surface equivalent portion, and the radius of the center is This is the area corresponding to the planar part. The distance between the edge of the pleated portion forming region and the portion equivalent to the bottom surface is set to be larger than the distance between the edge of the flat portion forming region and the portion equivalent to the bottom surface.

[0010] With this configuration, the container has at least a portion of the pleated portion that is higher than the flat portion.

[0011] The invention described in claim 2 is the same as the invention described in claim 1, in which, when the peripheral wall portion is upright relative to the bottom, the length of the ridge that defines the minimum height of the pleated portion is set to be greater than or equal to the height of the flat portion.

[0012] In this configuration, the length of the ridge that defines the minimum height of the pleated portion is set to be equal to or greater than the height of the flat portion when the container is upright, thereby raising the minimum height of the pleated portion when the container is in use, and as a result, the overflow position can be brought closer to the height of the flat portion or even higher.

[0013] The invention as set forth in claim 3 is the structure of the invention as set forth in claim 1 or 2, in which the pleated portion is formed by bending the peripheral wall portion so as to protrude outward relative to the planar portion.

[0014] With this configuration, the pleated portion protrudes outward from the planar portion, thereby expanding the internal space of the container. Effect of the Invention

[0015] As described above, in the invention described in claim 1, at least a portion of the pleated portion is higher than the planar portion, thereby improving the storage capacity for items that can be supported by the pleated portion, such as granular components with relatively large particle sizes and paste-like foods with relatively high viscosity.

[0016] The invention described in claim 2, in addition to the effects of the invention described in claim 1, raises the overflow position of the container, thereby increasing the amount of fluid items that can be stored, such as granular components with relatively small particle sizes, and liquid, gel, and powdered foods.

[0017] The invention as set forth in claim 3 provides the effects of the invention as set forth in claim 1 or 2, and in addition, since the internal space is expanded, a container with a large capacity can be provided. [Brief description of the drawings]

[0018] [Figure 1] 1A to 1C are diagrams showing a container according to a first embodiment of the present invention, in which (A) is a plan view, (B) is a front view, and (C) is a right side view. [Diagram 2] FIG. 2A is a plan view of a blank used to manufacture the container of FIG. 1, and FIG. 2B is an enlarged plan view of a portion of this blank. [Diagram 3] 2A and 2B are diagrams showing a state in which the peripheral wall portion of the container in FIG. 1 is upright, in which (A) is a plan view and (B) is a front view. [Figure 4] FIG. 2 is an enlarged cross-sectional view taken along line XX in FIG. [Diagram 5]5A to 5C are diagrams showing a container according to a second embodiment of the present invention, where (A) is a plan view, (B) is a front view, and (C) is a right side view. [Figure 6] FIG. 6(A) is a plan view of a blank used to manufacture the container of FIG. 5, and FIG. 6(B) is an enlarged plan view of a portion of this blank. [Figure 7] 6A and 6B are diagrams showing a state in which the peripheral wall portion of the container in FIG. 5 is stood upright, (A) being a plan view and (B) being a front view. [Figure 8] FIG. 1 shows an example of a conventional container, where (A) is a plan view, (B) is a front view, and (C) is a right side view. [Figure 9] FIG. 1 is a plan view of a blank used to manufacture a conventional container. [Figure 10] 9A and 9B are diagrams showing a state in which the peripheral wall portion of the container in FIG. 8 is stood upright, (A) being a plan view and (B) being a front view. [Figure 11] FIG. 9 is an enlarged cross-sectional view taken along line YY in FIG. 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] [First embodiment] FIG. 1 is a diagram showing a container according to a first embodiment of the present invention, where (A) is a plan view, (B) is a front view, and (C) is a right side view. In FIG. 2, (A) is a plan view of a blank used to manufacture the container of FIG. 1, and (B) is an enlarged plan view of a portion of this blank. FIG. 3 is a diagram showing the peripheral wall portion of the container of FIG. 1 in an upright state, where (A) is a plan view and (B) is a front view. FIG. 4 is an enlarged cross-sectional view taken along line XX in FIG. 1.

[0020] The basic shape of the container 20A of this embodiment is the same as that of the conventional container. That is, as shown in Fig. 1, the container has an open top, a bottom 21, and a peripheral wall 22 standing up from the bottom 21. The peripheral wall 22 has a planar portion 23 formed flat and a pleated portion 24 formed by folding the peripheral wall 22 along a linear folding portion 22a extending in the standing direction of the peripheral wall 22. The pleated portions 24 in this example are formed by bending the peripheral wall portion 22 so as to protrude outward relative to the planar portion 23. Moreover, the pleated portions 24 are provided at four locations corresponding to the four corners of an imaginary rectangle in a plan view.

[0021] In the container 20A of this example, when the peripheral wall portion 22 is upright relative to the bottom portion 21, the pleated portion 24 is formed so that its height from the bottom portion 21 is higher than that of the flat portion 23. The container 20A of this type can be obtained by press-molding the blank 10A shown in FIG.

[0022] The blank 10A is made of a sheet-like material such as paper, plastic film, metal foil, or a laminate of these materials. When multiple products are to be manufactured simultaneously, multiple blanks 10A are used in a stacked state.

[0023] 2, the blank 10A has a bottom surface equivalent portion 11 corresponding to the bottom of the container and a peripheral wall equivalent portion 12 corresponding to the peripheral wall portion, and the peripheral wall equivalent portion 12 has a flat portion forming region 12b corresponding to the flat portion and a pleated portion forming region 12a corresponding to the pleated portion. The outer edge of the bottom surface equivalent portion 11 and the edge portion of the peripheral wall equivalent portion 12 are both shaped by combining an arc and a straight line. In this example, the part of the peripheral wall equivalent portion 12 whose edge portion is arc-shaped is set to the pleated portion forming region 12a, and the part whose edge portion is straight is set to the flat portion forming region 12b.

[0024] 1B, the distance between the edge of the pleated portion forming region 12a and the bottom surface equivalent portion 11 is set to be larger than the distance D2 between the edge of the flat portion forming region 12b and the bottom surface equivalent portion 11. A specific setting example is as follows.

[0025] In the conventional blank, the arc-shaped portion 14 at the edge of the peripheral wall portion 12 and the arc-shaped portion 13 at the outer edge of the bottom surface portion 11 are concentric circles with a common center at point P1, the straight line portion at the edge of the peripheral wall portion 12 and the straight line portion at the outer edge of the bottom surface portion 11 are set to be parallel to each other, and the distance D2 from the edge of the peripheral wall portion 12 to the bottom surface portion 11 is constant. In contrast, in the blank 10A of this example, the center of the arc-shaped portion at the edge of the pleated portion forming region 12a is set to point P2 on the arc-shaped portion 13 at the outer edge of the bottom surface portion 11, and the radius is set to D1, which is larger than the above D2. As a result, the distance D1 from the edge of the pleated portion forming region 12a to the bottom surface portion 11 is set to be larger than the distance D2 from the edge of the flat portion forming region 12b to the bottom surface portion 11.

[0026] The blank 10A is press-molded using a conventionally known apparatus and method to manufacture the container 20A of this embodiment. The press-molding apparatus and manufacturing method used are outlined below.

[0027] The press molding device includes a male mold and a female mold having a molding surface and a molding space that is open on one side and the other side, and the pressing part of the male mold is configured to be able to advance and retreat along the communication direction of the molding space. It also includes a moving means for moving the male mold toward and away from the female mold, heaters for heating the male mold and the female mold, and a control means for controlling the operation of the heaters.

[0028] The manufacturing method of the container is carried out by the following steps. First, the male and female dies are heated to an appropriate temperature by a heater. Next, the blank is placed on one side of the molding space in the female die, and then the male die is moved by the moving means in a direction approaching the female die, so that the blank is sandwiched between the male and female dies. Then, with the blank sandwiched between the male and female dies, the pressing part of the male die is moved toward the molding space to press the blank into the molding space. As a result, the part corresponding to the bottom of the blank is pressed into the molding space, and at the same time, the part corresponding to the peripheral wall is brought into contact with the molding surface and stands up. At that time, the peripheral wall is folded along the linear folding part extending in the standing direction, and a first blank molding body having a large number of pleated parts is formed.

[0029] Next, the male mold is separated from the female mold, and while the first blank molding body is held within the molding space, a second blank is placed on one side of the molding space, and the above-mentioned process is then carried out again to form the second blank molding body so as to be stacked on top of the first blank molding body.

[0030] By repeating the above steps several times, blank bodies are accumulated in the molding space, and the bottom of the subsequently molded blank body presses against the peripheral wall of the previously molded blank body, causing the blank body to move from one side to the other within the molding space and finally being ejected as a completed container from the other side of the female mold.

[0031] The container 20A thus manufactured can be formed in such a manner that, by setting the pleated portion forming region 12a and the flat portion forming region 12b of the blank 10A as described above, when the peripheral wall 22 is in an upright position relative to the bottom 21, the maximum height H1 of the pleated portion 24 from the bottom 21 is higher than the height H2 of the flat portion 23, and the length of the ridge defining the minimum height of the pleated portion is set to be equal to or greater than the height of the flat portion, as shown in Fig. 3. As a result, it is possible to increase the capacity of the container 20A compared to the conventional case. The reason for this will be explained below.

[0032] As shown in Fig. 4, when container 20A is used to store articles, peripheral wall 22 is usually inclined outward to widen the opening on the top surface. In this state, the inclination angle of inner ridge 25a of pleated portion 24 with respect to the vertical direction is set to angle θ1, which is the same as that of flat portion 23. For comparison, this θ1 is set to the same value as θ1 in Fig. 11. Furthermore, outer ridge 25b is further inclined by angle θ2 determined by the folding width of peripheral wall 23, and this θ2 is also set to the same value as θ2 in Fig. 11.

[0033] In this example, the pleated portion 24 is bent so as to protrude outward from the flat portion 23, so that the height of the edge of the pleated portion 24 from the bottom 21 is higher at the inner ridge 25a and lower at the outer ridge 25b. The edge of the pleated portion forming region 12a of the blank 10A (see FIG. 2) is formed in an arc shape, and the dimensional difference with the conventional edge 14 is set to be maximum at the midpoint. Therefore, the edge of the pleated portion 24 of the container 20A has a maximum height H3 at the upper end portion 24a of the inner ridge 25a at the midpoint, and H3=D1·cosθ1 from the setting of the blank 10A. On the other hand, it is considered that the height H5 is minimum at the upper end portion 24b of the outer ridge 25b adjacent to the flat portion 22, and if the length of this ridge 25b is D3, then H5=D3·cos(θ1+θ2). Due to the setting of the blank 10A, the distance from the edge to the bottom 21 is D2, so that the height H4 of the flat portion 23 is H4=D2·cos θ1.

[0034] The overflow position of the container 20A is the height position of the part 24b where the height of the peripheral wall 22 is the lowest. In conventional containers, the length of each ridgeline is set equal to the distance from the edge of the flat part to the bottom (D1=D2=D3). In contrast, in this example, the length D3 of the ridgeline 25b that defines the minimum height of the pleated part 24 is set to be greater than the distance D2 of the flat part 23 (D3>D2), so that the height H5 of the part 24b where the height is the lowest is higher than the height h2 of the conventional lowest part (see FIG. 11). Therefore, since the overflow position is raised, the capacity of the container for fluid products such as liquid foods can be increased.

[0035] Furthermore, because the blank 10A is set such that D1>D2, the height H3 of the maximum height portion 24a is higher than the height H4 of the flat portion 23 (H3>H4). This makes it possible to increase the amount of items that can be supported by the pleated portion, such as granular members with relatively large particle sizes or paste-like foods with relatively high viscosity.

[0036] [Second embodiment] FIG. 5 is a diagram showing a container according to a second embodiment of the present invention, where (A) is a plan view, (B) is a front view, and (C) is a right side view. FIG. 6 (A) is a plan view of a blank used to manufacture the container of FIG. 5, and (B) is an enlarged plan view of a portion of this blank. FIG. 7 is a diagram showing the peripheral wall portion of the container of FIG. 5 in an upright state, where (A) is a plan view and (B) is a front view.

[0037] In the container 20B of this example, the outer edge of the bottom 21 in plan view is composed of two semicircular parts arranged line-symmetrically and a straight part connecting them, with the peripheral wall 22 rising from the straight part being the planar part 23 and the peripheral wall 22 rising from the semicircular part being the pleated part 24. And, when the peripheral wall 22 is made to stand upright relative to the bottom 21, the pleated part 24 is formed to be higher than the planar part 23.

[0038] 6, blank 10B for manufacturing container 20B includes peripheral wall portion 12 including pleated portion forming regions 12a, 12c corresponding to the pleated portions and flat portion forming region 12b corresponding to the flat portion. In this example, pleated portion forming region includes arcuate edge region (12a) and short linear region (12c).

[0039] The pleated portion forming regions 12a, 12c and the planar portion forming region 12b are set as follows so that when the peripheral wall equivalent portion 12 is raised relative to the bottom surface equivalent portion 11 to form the bottom and peripheral wall portions, at least a portion of the pleated portion is higher than the planar portion and the length of the ridge defining the minimum height of the pleated portion is set to be greater than or equal to the height of the planar portion.

[0040] 6B, the distance D4 from the edge of the pleated portion forming region 12a, 12c to the bottom surface equivalent portion 11 in the blank 10B is set to be larger than the distance D5 from the edge of the flat portion forming region 12b to the bottom surface equivalent portion 11. In the conventional blank, the arc-shaped portion 14 at the edge of the peripheral wall equivalent portion 12 and the arc-shaped portion 13 at the outer edge of the bottom surface equivalent portion 11 are concentric circles with a common center at point Q1, and the straight portion at the edge of the peripheral wall equivalent portion 12 and the straight portion at the outer edge of the bottom surface equivalent portion 11 are set to be parallel to each other. In contrast, in the blank 10B of this example, the center Q2 of the arc-shaped portion at the edge of the pleated portion forming region 12a is set to a position outside the center Q1 of the arc-shaped portion 13 of the bottom surface equivalent portion 11, and the radius R is set so that the distance D4 is larger than the distance D5.

[0041] With such settings, the product 10B obtained by press-molding the blank 10B can be formed in a shape such that, when the peripheral wall portion 22 is held upright relative to the bottom portion 21, as shown in Figure 7, the pleated portion 24 is higher than the planar portion 23, and the length of the ridge defining the minimum height of the pleated portion is equal to or greater than the height of the planar portion.

[0042] Although the drawings showing the embodiment of the present invention show the case where the folds are formed by folding the peripheral wall so as to protrude outward from the flat portion, the folds may be formed by folding the peripheral wall inward from the flat portion.Furthermore, the folds may be formed by folding the peripheral wall so that the ridges are located both inside and outside the flat portion.

[0043] The pleated portions are preferably arranged rotationally symmetrically about the central axis of the bottom, but may be arranged asymmetrically depending on the shape of the container.

[0044] Furthermore, a flat area parallel to the surface of the bottom may be formed at the highest part of the edge of the pleated portion. With this configuration, in the process of manufacturing a container by press molding, when a plurality of blanks are stacked and pushed out of a molding device, the load acting on the blanks can be dispersed, and deformation of the blanks is less likely to occur. A container of this type can be obtained by forming the blanks such that the periphery of the apex of the highest ridgeline is bulged outward.

[0045] Furthermore, it is sufficient that the pleated portion has at least a portion that is formed so that its height from the bottom is higher than that of the planar portion, and the length of the ridge that defines the minimum height of the pleated portion when the peripheral wall is in an upright position does not necessarily have to be set to be greater than or equal to the height of the planar portion. [Explanation of symbols]

[0046] 10A, 10B...Blank 11...Equivalent to the bottom surface 12...Peripheral wall equivalent part 12a, 12c...fold-forming region 12b...Planar part forming area 20A, 20B…Container 21…Bottom 22...Peripheral wall part 23...Planar part 24...Folded part In addition, the same symbols in each drawing indicate the same or corresponding parts.

Claims

1. A container manufactured by molding a blank made of a sheet-like member, It has a bottom and a peripheral wall rising from the bottom, The peripheral wall portion has a planar portion formed flat and a pleated portion formed by folding the peripheral wall portion along a linear folding portion extending in a direction in which the peripheral wall portion stands up, When the peripheral wall portion is upright relative to the bottom portion, at least a part of the pleated portion is formed to have a height from the bottom portion greater than that of the planar portion, In the blank state, an edge portion of a pleated portion forming region, which is a region corresponding to the pleated portion, and an outer edge portion of a bottom surface equivalent portion, which is a portion corresponding to the bottom, facing the edge portion of the pleated portion forming region, are formed in an arc shape, and the center position of the arc-shaped portion in the pleated portion forming region is set outside the center position of the arc-shaped portion in the bottom surface equivalent portion, A container in which the center of the arc-shaped portion that forms the edge of the pleated portion forming region is set to a point on the arc-shaped portion of the outer edge of the bottom surface equivalent portion, and its radius is set to a distance dimension from the edge of the pleated portion forming region to the bottom surface equivalent portion that is larger than the distance dimension from the edge of the flat portion forming region, which is the region corresponding to the flat portion, to the bottom surface equivalent portion.

2. 2. The container according to claim 1, wherein, when the peripheral wall is upright relative to the bottom, the length of the ridge defining the minimum height of the pleated portion is set to be equal to or greater than the height of the flat portion.

3. 3. The container according to claim 1, wherein the pleated portion is formed by bending the peripheral wall portion so as to protrude outward from the flat portion.

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