Packaging containers

Abstract

To provide a packaging container capable of selecting whether to mount a frame body and making the frame body difficult to come off by gripping the frame body with desired gripping force when mounting.SOLUTION: A packaging container has a storage part 1 of content having side wall parts 2 and flange parts 3 formed outside the storage part 1 to face the side wall parts 2. The side wall parts 2 have first rib parts 4 expanded to the flange parts 3 side, the flange parts 3 have second rib parts 5 expanded to the side wall parts 2 side from positions adjacent to the first rib parts 4, and the first rib parts 4 and the second rib parts 5 narrow a space S between the side wall parts 2 and the flange parts 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0005] , ,

[0001] The present invention relates to a packaging container that can be selectively decorated with a frame covering the periphery.

Background Art

[0002] Conventionally, for example, in packaging containers for foods such as prepared foods and boxed lunches sold in supermarkets and convenience stores, the periphery has sometimes been decorated with a frame. The frame has a simple shape and can be easily manufactured in multiple types depending on the selection of color combination and pattern. Therefore, when it is desired to decorate the whole without applying a color combination or pattern to the packaging container, a frame has been adopted, but the structure of the packaging container suitable for attaching the frame has been studied.

[0003] For example, Patent Document 1 discloses a holding groove formed at the upper edge of a container body corresponding to the above-mentioned packaging container for holding a paper frame, and paper holding ribs formed at the corner positions of the inner wall portion of the container body, which is a part of the holding groove, and at both side positions close to this corner position. According to this configuration, by guiding the frame outside the stack formed other than the corner position of the inner wall portion, it is expected to have the effect of making it easy to attach the frame without interfering with the stack.

Prior Art Documents

Patent Documents

[0004] <​​​​​​​​​​​​Patent Document 1 also discloses a structure in which the frame is sandwiched between the outer wall portion of the pressing groove (see paragraphs "0012" and "0025" and Figure 3). However, since the outer wall portion is not formed in a rib shape, the strength of the outer wall portion is lower compared to the inner wall portion in which paper pressing ribs are formed, making it difficult to expect a gripping force for the frame by the pressing groove, and there is a risk that the frame may come off or shift position due to external forces received during transport or stacking.

[0006] In light of the Sustainable Development Goals (SDGs) and environmental issues, it is desirable that packaging containers not only take raw materials into consideration but also be widely used without limiting their applications. In other words, the inventors concluded that if the frame does not necessarily need to be attached and can be selected as appropriate, is easy to attach and detach, and exhibits the desired gripping force when attached, then a packaging container that takes into account the Sustainable Development Goals and environmental issues can be realized.

[0007] Therefore, the object of the present invention is to provide a packaging container that allows the user to choose whether or not to attach a frame, and that, when attached, grips the frame with a desired gripping force to prevent it from coming off. [Means for solving the problem]

[0008] In other words, the packaging container of the present invention comprises a content storage section having a side wall and a flange section formed on the outside of the content storage section so as to face the side wall, the side wall section having a first rib section that bulges toward the flange section, and the flange section having a second rib section that bulges toward the side wall section from a position adjacent to the first rib section, and the first rib section and the second rib section narrow the gap between the side wall section and the flange section.

[0009] Preferably, the first rib portion is formed to bulge outwards from the corner portion, which is part of the side wall, toward the flange portion, and the second rib portion is formed to bulge outwards from the flange portion, which corresponds to at least both sides of the first rib portion toward the side wall portion.

[0010] The flange portion has a flange flat portion that extends outward from the upper end of the side wall portion, and a flange skirt portion that hangs down from the outer end of the flange flat portion and faces the side wall portion. Preferably, the first rib portion is formed to cut out the flange flat portion and the side wall portion, and the second rib portion is formed to cut out the flange flat portion and the flange skirt portion.

[0011] The first rib section is preferably roughly U-shaped in plan view, and has a corner cut at the vertical corner.

[0012] Furthermore, another packaging container in the present invention is characterized by comprising an inner container corresponding to the above-mentioned packaging container, a frame having substantially the same shape as the inner container in a plan view and being taller than the height of the inner container, and a lid that is attached to the inner container. [Effects of the Invention]

[0013] According to the present invention, it is possible to choose whether or not to attach the frame, and when attached, the frame can be gripped with a desired gripping force, making it less likely to come off. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of a packaging container according to one embodiment of the present invention. [Figure 2] This is a plan view of the above packaging container. [Figure 3] This is a bottom view of the above packaging container. [Figure 4] This is an enlarged view of section X in the bottom view shown above. [Figure 5] This is an enlarged cross-sectional view of the BB portion within the AA portion of the enlarged view of the X portion shown above. [Figure 6] This is a plan view (a) and a section view (b) of the frame N in one embodiment of the present invention. [Modes for carrying out the invention]

[0015] The packaging container (hereinafter also referred to as "this packaging container") in one embodiment of the present invention will be described below with reference to Figures 1 to 5. In these figures, in cases where there are multiple identical parts, only one part is numbered. For the sake of explanation, predetermined parts and their leader lines are shown with hidden lines (dashed lines) or imaginary lines (dotted lines), and cross-sections are shown with hatching. In the explanation, terms indicating directions such as upward, downward, sideways, vertical, and horizontal are basically based on the state in which the packaging container is installed in the orientation it is normally used in, and when a different orientation is used as the reference, it will be explained as appropriate.

[0016] <Basic composition of this packaging container> As shown in Figure 1, this packaging container is used to package food items such as prepared meals and bento boxes sold in retail stores such as supermarkets. The container body M corresponds to the container body, and it is optional whether or not a frame N is attached to cover it. The container body M and frame N are roughly rectangular in plan view, but they may also be square or rectangles with pentagons or more. Furthermore, they only need to be small enough to be placed on display shelves in retail stores, and their dimensions such as length, width, and height are not limited.

[0017] <Overview of Container Body M> The container body M comprises a food storage section 1 having a side wall 2, and a flange section 3 formed on the outside of the storage section 1 so as to face the side wall 2. In other words, the container body M comprises an unnumbered bottom on which food is placed, a side wall 2 that rises continuously from the peripheral edge of the bottom, and a flange section 3 that is formed outwardly continuously from the upper edge of the side wall 2, and the storage section 1 is formed by the bottom and the side wall 2. The storage section 1 is divided into two by an unnumbered partition, but it may not be divided, or it may be divided into three or more sections. The side wall 2 and the flange section 3 face each other all around, and the gap S between the side wall 2 and the flange section 3 is groove-shaped.

[0018] The side wall portion 2 has a first rib portion 4 that bulges toward the flange portion 3 from a predetermined location. The flange portion 3 has a second rib portion 5 that bulges toward the side wall portion 2 from a position adjacent to the first rib portion 4. The first rib portion 4 and the second rib portion 5 narrow the gap S between the side wall portion 2 and the flange portion 3.

[0019] According to this configuration, since the frame body N thinner than the gap S is sandwiched between the first rib portion 4 and the second rib portion 5 and fits into the gap S between the side wall portion 2 and the flange portion 3, the frame body N can be easily attached to and detached from the gap S. Since the first rib portion 4 is a portion with high strength in the side wall portion 2 and the second rib portion 5 is a portion with high strength in the flange portion 3, an effect of obtaining a desired gripping force on the frame body N by the first rib portion 4 and the second rib portion 5 can be expected. A set of one first rib portion 4 and two second rib portions 5 is likely to exhibit the desired gripping force, but a set of one first rib portion 4 and one second rib portion 5 may also be used. The bulging surfaces of the first rib portion 4 and the second rib portion 5 are preferably perpendicular, and thus an effect of surface contact with the frame body N can be expected.

[0020] <Material, forming method, etc. of the container body M> The container body M is formed using a synthetic resin sheet as a base material. The synthetic resin sheet is made of, for example, olefin resins such as polyethylene and polypropylene, polystyrene paper (PSP) made of polystyrene resin, high-impact polystyrene (HIPS) obtained by blending an elastomer such as a butadiene copolymer with GP polystyrene to improve impact resistance, or polyester resins such as polyethylene terephthalate. It may use paper powder as the main raw material and the above olefin resins etc. as a binder, may be composed of a single layer or multiple layers, may be colored or colorless and transparent, or may be opaque, and may be formed of a heat-resistant material. Here, examples of the heat-resistant material include non-foamed composite materials containing 40 to 90% by mass of an olefin resin such as polypropylene and 10 to 60% of an inorganic filler such as talc. The synthetic resin sheet is formed into a desired container body shape by a thermoforming method such as vacuum forming, hot plate pressure-air forming, vacuum pressure-air forming, double-sided vacuum forming, etc. The front surface and / or the back surface of the synthetic resin sheet may be laminated with a synthetic resin film. The synthetic resin film may be composed of a single layer or multiple layers having heat resistance, oil resistance, lamination suitability with a printing layer, gas barrier properties, etc., and may include a printing layer when laminated on the front surface of the synthetic resin sheet.

[0021] <Details of the side wall portion 2> As shown in FIG. 2, the side wall portion 2 slopes outward from the peripheral edge of the bottom, but the inclination angle is not limited and it may not be inclined. The side wall portion 2 has a side wall corner portion 21 corresponding to the corner portion formed between adjacent side wall portions. The side wall corner portion 21 is each of the four corners of the side wall portion 2 and also corresponds to each of the four corners of the accommodating portion 1, and is preferably beveled, but may not be beveled. The side wall corner portion 21 has a side wall corner flat portion 22 formed between the lower end corresponding to the peripheral edge of the bottom and the upper end, but it may not have it.

[0022] <Details of the flange portion 3> As shown in Figure 2, the flange portion 3 is inclined outward from the upper end of the side wall portion 2, but the angle of inclination is not limited, and it does not have to be inclined. The flange portion 3 has flange corner portions 31 which correspond to the corner portions formed between adjacent flange portions. The flange corner portions 31 are each of the four corners of the flange portion 3 and are curved portions, in other words, the range from the curved portion to the straight portion of the flange portion 3. The flange portion 3 has a flange flat portion 32 which extends outward from the upper end of the side wall portion 2, and a flange skirt portion 33 which hangs down from the outer end of the flange flat portion 32 and faces the side wall portion 2, but the flange skirt portion 33 may be continuous from the upper end of the side wall portion 2 without going through the flange flat portion 32.

[0023] <Relationship between side wall portion 2 and flange portion 3> As shown in Figure 5, the side wall portion 2 and the flange portion 3 face each other with a gap S in between near the upper end of the housing portion 1, and the perpendicular end faces of both are preferably approximately trapezoidal in shape, considering strength. In other words, the gap S is narrower towards the upper end of the housing portion 1 and wider towards the lower end. The above-mentioned vertical end faces may be determined by the inclination angle of the side wall portion 2, the inclination angle of the flange skirt portion 33, and the width of the shorter side of the flange flat portion 32, and may be triangular, square, or rectangular, for example.

[0024] <Details of the first rib section 4 and the second rib section 5> As shown in Figure 3, the first rib portion 4 is formed to bulge out from the side wall corner portion 21 of the side wall portion 2 toward the flange corner portion 31 of the flange portion 3. The second rib portion 5 is formed to bulge out toward the side wall portion 2 from a position corresponding to at least both sides of the first rib portion 4 of the flange portion 3. The positions corresponding to both sides of the first rib portion 4 may exclude the flange corner portion 31, or they may include all or part of the flange corner portion 31, preferably from the boundary between the curved portion of the flange corner portion 31 and the straight portion of the flange portion 3 to the straight portion.

[0025] With this configuration, each of the four corners of the frame N is sandwiched between the first rib portion 4 and the second rib portion 5, so compared to cases where other parts are sandwiched, it can be expected that the frame N will be less likely to shift position from the gap S. If the second rib portions 5, 5 are not facing the first rib portion 4 and are separated from each other, the corners of the frame N will face the first rib portion 4 and fit between the second rib portions 5, 5, making it easier to enhance the above effect. The second rib portions 5 may be a pair or have different shapes.

[0026] As shown in Figure 2, the first rib portion 4 is formed by cutting out the flange flat portion 32 and the side wall portion 2. The second rib portion 5 is formed by cutting out the flange flat portion 32 and the flange skirt portion 33. The first rib portion 4 may be formed by cutting out the side wall corner portion 21, or by cutting out the side wall corner portion 21. The second rib portion 5 may be formed by cutting out the flange corner portion 31, or by cutting out the flange corner portion 31.

[0027] With this configuration, as shown in Figure 5, the first rib portion 4 bulges out in a planar manner from the side wall portion 2, and the second rib portion 5 bulges out in a planar manner from the flange skirt portion 33. As a result, the first rib portion 4 and the second rib portion 5 make surface contact with the frame N, and it is expected that the frame N will be gripped with a desired gripping force and will be less likely to come off.

[0028] As shown in Figures 3 to 5, the first rib portion 4 is roughly U-shaped in plan view, and has first rib corner cut portions 43, 43 at the vertical corners.

[0029] With this configuration, the first rib portion 4 is easier to secure the strength of the side wall corner portion 21 compared to a dome shape or semicircular shape in plan view, the first rib corner cut portion 43 is easier to guide the frame N when inserted, and is expected to have the effect of being easier to grip facing the frame N.

[0030] As shown in Figures 4 and 5, the first rib portion 4 has a first rib bottom portion 41 that extends outward in continuous with the side wall corner flat portion 22, a first rib side portion 42 that rises substantially vertically in continuous with the outer edge of the first rib bottom portion 41 and is continuous with the side wall portion 2 and the flange flat portion 32, and first rib corner cut portions 43, 43 that correspond to the vertical corner portions of the first rib side portion 42.

[0031] As shown in Figure 3, the second rib portion 5 is approximately trapezoidal in plan view, but it may be dome-shaped, semicircular, or elliptical. More specifically, as shown in Figures 4 and 5, the second rib portion 5 has a second rib bottom portion 51 and a second rib side portion 52 that rises approximately vertically from the inner edge of the second rib bottom portion 52 and is continuous with the flange skirt portion 33 and the flange flat portion 32. The second rib side portion 52 has the innermost second rib inner portion 52a.

[0032] As shown in Figures 4 and 5, when the flange flat portion 32 is divided into an inner portion and an outer portion in the longitudinal direction with respect to the housing portion 1 and a virtual boundary surface is assumed, the first rib corner cut portion 43 is located in the inner portion and near the virtual boundary surface, and the second rib inner portion 52a is located in the outer portion and near the virtual boundary surface. In other words, the first rib portion 4 bulges out so as not to exceed the virtual boundary surface and has a first rib corner cut portion 43 that is substantially parallel to the virtual boundary surface, and the second rib portion 5 bulges out so as not to exceed the virtual boundary line and has a second rib inner portion 52a that is substantially parallel to the virtual boundary line.

[0033] The sum of the distance from the first rib corner cut portion 43 to the virtual boundary surface and the distance from the second rib inner portion 52a to the virtual boundary surface may be less than or equal to the thickness of the frame N, as long as the desired gripping force is obtained, and may be zero (each lying on the virtual boundary surface), or it may be determined according to the rigidity of the frame N against pressing in the thickness direction. In other words, by not having the first rib portion 4 and the second rib portion 5 face each other, and more precisely, by not having the first rib corner cut portion 43 and the second rib inner portion 52a face each other, the sum can be made zero or as small as possible, and the effect of increasing the gripping force on the frame N can be expected.

[0034] As shown in Figures 3 to 5, the first rib portion 4 and the second rib portion 5 may or may not have multiple unnumbered ribs to reinforce their strength. As shown in Figure 5, the height of the first rib portion 4 and the second rib portion 5 is preferably about the same as the height from the lower end to the upper end of the flange portion 3 in order to obtain the desired strength and gripping force of the frame N, but it may be less than the above height, in which case the bottom of the first rib 41 and the bottom of the second rib 51 may be at any height from the upper end to the lower end of the flange portion 3.

[0035] <Structure of Frame N> As shown in Figure 6(a), the frame N is formed by folding a single strip of corrugated cardboard into a cylindrical shape and gluing the folded ends N1 together. The part where the folded ends N1 are glued is double-layered and thicker than the rest of the frame. Therefore, as shown in Figure 6(b), both ends N1a, N1a in the vertical direction of the folded ends N1 are cut diagonally.

[0036] With this configuration, as shown in Figure 1, when the frame N is attached to the container body M, the folded ends N1a, N1a do not interfere with the first rib portion 4 and the second rib portion 5, and the effect of being able to smoothly fit the frame N into the gap S can be expected. Considering the size of the container body 1, the thickness of the corrugated cardboard material is preferably E flute, but other thicknesses such as A flute, B flute, and W flute may also be used.

[0037] <Configuration of another packaging container> Although not shown in the figures, another packaging container comprises an inner container corresponding to the container body for food, a frame that is substantially the same shape as the inner container in plan view and taller than the height of the inner container, and a lid that is attached to the inner container. The inner container and frame may be equivalent to the container body M and frame N described with reference to Figures 1 to 6.

[0038] With this configuration, the bottom of another packaging container becomes hollow due to the frame, and when stacked, the lid of the lower packaging container fits into the frame of the upper packaging container, making it easier to stack and less likely to collapse.

[0039] It should be noted that the packaging container shown in this embodiment is not limited to the above-described content, and includes the position, shape, dimensions, and relationships between any part, as long as equivalent effects can be obtained. [Explanation of Symbols]

[0040] M Container body N Frame (N1 Folding piece, N1a Folding piece end) 1. Storage area 2 Side wall section 21 Side wall corner 22 Side wall corner flat section 3. Flange section 31 Flange corner section 32 Flange flat section 33 Flange skirt section 4. First rib section 41 Bottom of the first rib 42 Side of the first rib 43. First rib corner cut section 5. Second rib section 51 Bottom of the second rib 52 Side of the second rib 52a Inner part of the second rib

Claims

1. A compartment for storing contents having side walls, It comprises a flange portion formed on the outside of the housing portion so as to face the side wall portion, The side wall portion has a first rib portion that bulges out toward the flange portion. The flange portion has a second rib portion that bulges out toward the side wall portion from a position adjacent to the first rib portion. The first rib section and the second rib section narrow the gap between the side wall section and the flange section. The flange portion has a flange flat portion that extends continuously from the upper end of the side wall portion to the outside of the housing portion, and a flange skirt portion that hangs down from the outer end of the flange flat portion and faces the side wall portion. The first rib portion is formed by cutting out the flange flat portion and the side wall portion. The second rib portion is formed to cut out the flange flat portion and the flange skirt portion. A packaging container characterized by the following features.

2. A compartment for storing contents having side walls, It comprises a flange portion formed on the outside of the housing portion so as to face the side wall portion, The side wall portion has a first rib portion that bulges out toward the flange portion. The flange portion has a second rib portion that bulges out toward the side wall portion from a position adjacent to the first rib portion. The first rib section and the second rib section narrow the gap between the side wall section and the flange section. The first rib section is roughly U-shaped in plan view and has a corner cut at the vertical corner. A packaging container characterized by the following features.

3. The first rib portion is formed to bulge out from the corner portion, which is part of the side wall, towards the flange portion. The second rib portion is formed to bulge outwards towards the side wall portion from a position corresponding to at least both sides of the first rib portion within the flange portion. A packaging container according to claim 1 or 2.

4. An inner container corresponding to the packaging container described in any one of claims 1 to 3, In plan view, it has approximately the same shape as the inner container, and the frame is taller than the height of the inner container. It includes a lid that fits onto the inner container. A packaging container characterized by the following features.

Images