Packaging container

Abstract

To prevent the occurrence of blocking in a packaging container.SOLUTION: A packaging container including a flat surface portion and a side surface portion surrounding the flat surface portion, wherein the side surface portion includes a first protruding portion and a second protruding portion in order from the flat surface portion side, the first protruding portion includes a first projecting portion, the second protruding portion includes a second projecting portion, and when the packaging containers are stacked, a part of an outer side of the first protruding portion in one of the packaging containers abuts on a part of an inner side of the second protruding portion in the other packaging container, the first projection of the one wrapping container and the second projection of the other wrapping container are partially in contact with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging container. [Background technology]

[0002] BACKGROUND ART Conventionally, packaging containers for storing food products have been widely used in retail stores, etc. Packaging containers are composed of a container body on which food products or the like are placed and a lid body that fits onto the container body.

[0003] In recent years, automation has progressed in food factories. In the automation of food factories, container bodies and lids are automatically supplied by being individually removed from a stack of multiple containers. When container bodies and lids are stacked, because the container bodies and lids all have the same shape, a phenomenon known as blocking can occur, in which the upper container body or lid gets stuck in the lower container body or lid. When blocking occurs, it becomes difficult to individually remove the container bodies or lids.

[0004] For example, Patent Document 1 discloses a container body that prevents blocking. The container body in Patent Document 1 has an outer step on the outer surface of the side wall and an inner step on the inner surface of the side wall, and when the container bodies are stacked, the outer step of the upper container body abuts against the inner step of the lower container body, thereby ensuring a certain distance between the upper and lower container bodies and preventing blocking. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-147535 Summary of the Invention [Problem to be solved by the invention]

[0006] However, even in the container body of Patent Document 1, when force is applied to stacked container bodies, depending on the direction and magnitude of the force, the container bodies may shift laterally, causing the upper container body to become stuck in the lower container body, which could result in blocking.

[0007] Therefore, one of the objects of the present invention is to prevent the occurrence of blocking in packaging containers. [Means for solving the problem]

[0008] A packaging container according to one embodiment of the present invention comprises a flat surface and a side surface surrounding the flat surface, wherein the side surface has a first protrusion and a second protrusion, in that order from the flat surface side, the first protrusion includes a first protrusion, and the second protrusion includes a second protrusion, and when the packaging containers are stacked, a portion of the outer side of the first protrusion on one packaging container abuts a portion of the inner side of the second protrusion on the other packaging container, and a portion of the first protrusion on the one packaging container abuts a portion of the second protrusion on the other packaging container.

[0009] In a packaging container according to one embodiment of the present invention, the shape of the planar portion is rectangular when viewed in a plane, and at least two opposing corners of the planar portion, the side portion is provided with the first protrusion and the second protrusion.

[0010] In a packaging container according to one embodiment of the present invention, the shape of the planar portion is circular when viewed in a plane, and the side portion has the first protrusion and the second protrusion at at least three locations on the planar portion.

[0011] The packaging container according to one embodiment of the present invention may be a lid.

[0012] The packaging container according to one embodiment of the present invention may be a container body. [Effects of the Invention]

[0013] According to the packaging container according to one embodiment of the present invention, it is possible to prevent the occurrence of blocking. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view showing a lid according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view showing a lid according to an embodiment of the present invention. [Figure 3] 3 is a cross-sectional view of the cover taken along line III-III in FIG. 2. [Figure 4] 4 is a cross-sectional view of the cover taken along line IV-IV in FIG. 2. [Figure 5] FIG. 10 is a cross-sectional view of the lid bodies according to one embodiment of the present invention stacked one on top of another. [Figure 6] FIG. 10 is a cross-sectional view of the lid bodies according to one embodiment of the present invention stacked one on top of another. [Figure 7] FIG. 2 is a perspective view showing a container body according to one embodiment of the present invention. [Figure 8] FIG. 2 is a plan view showing a container body according to an embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along line VI-VI in FIG. 8. [Figure 10] FIG. 3 is a cross-sectional view taken along line XX in FIG. [Figure 11] FIG. 10 is a cross-sectional view of a stack of container bodies according to an embodiment of the present invention. [Figure 12] FIG. 10 is a cross-sectional view of a stack of container bodies according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. To clarify the description, the drawings may show the width, thickness, shape, etc. of each part more schematically than the actual embodiment, but these are merely examples and are not intended to limit the interpretation of the present invention. In this specification and each drawing, elements similar to those previously described with reference to the previous drawings are designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0016] <Lid> A lid according to one embodiment of the present invention will be described. Fig. 1 is a perspective view showing the lid 1. Fig. 2 is a plan view showing the lid 1. Fig. 3 is a cross-sectional view of the lid 1 taken along line III-III in Fig. 2. Fig. 4 is a cross-sectional view of the lid 1 taken along line IV-IV in Fig. 2. In a plan view of the lid 1, the side on which the flat portion 11 is located is referred to as the inside, and the side opposite the inside (the side on which the flat portion 11 is not located) is referred to as the outside. In a cross-sectional view of the lid 1, the side on which the flat portion 11 is located is referred to as the upper side, and the side opposite the upper side (the side on which the flange portion 13 is located) is referred to as the lower side.

[0017] As shown in FIGS. 1 and 2, the lid 1 includes a flat portion 11, a side portion 12 surrounding the flat portion 11, and a flange portion 13 surrounding the side portion 12. Examples of materials for the lid 1 include synthetic resins. Examples of synthetic resins include polyester resins such as biaxially oriented polystyrene (OPS) and polyethylene terephthalate (PET), and olefin resins such as polypropylene (PP) and polyethylene (PE). The lid 1 can be formed from a synthetic resin sheet by methods such as vacuum forming, hot plate pressure forming, vacuum pressure forming, and double-sided vacuum forming.

[0018] Examples of the shape of the flat portion 11 include a rectangle, a square, a polygon, and a circle in a plan view. When the shape of the flat portion 11 is a rectangle in a plan view, the corners 11c of the flat portion 11 may be rounded as shown in FIG.

[0019] As shown in Figures 1 and 2, the side surface portion 12 surrounds the flat surface portion 11. Furthermore, as shown in Figure 3, the side surface portion 12 extends downward from the peripheral edge of the flat surface portion 11. The side surface portion 12 includes a first inclined portion 123 that slopes outward, and a second inclined portion 124 that is connected to the first inclined portion 123 and also slopes outward. The second inclined portion 124 is formed so as to have a greater slope than the first inclined portion 123.

[0020] As shown in Fig. 3, the side surface portion 12 has, in order from the flat surface portion 11 side, a first protrusion 121 and a second protrusion 122. In Fig. 3, the first protrusion 121 is located above the second protrusion 122. The shape of the side surface portion 12 is not limited to this.

[0021] As shown in FIG. 2, the side surface portion 12 has a first protrusion 121 and a second protrusion 122 at each of the four corners 11c of the flat surface portion 11. The side surface portion 12 can have the first protrusion 121 and the second protrusion 122 at at least one corner 11c. Alternatively, the side surface portion 12 may have the first protrusion 121 and the second protrusion 122 at two opposing corners 11c. The side surface portion 12 may have the first protrusion 121 and the second protrusion 122 not only at the corners 11c of the flat surface portion 11 but also on the short sides and long sides of the flat surface portion 11.

[0022] As shown in Fig. 3, the first protrusion 121 and the second protrusion 122 are each formed to protrude outward. In Fig. 3, the first protrusion 121 and the second protrusion 122 are arranged so as to be continuous at the lower end of the second inclined portion, but they may also be arranged so as to be discrete at the side surface portion 12, and the arrangement of the first protrusion 121 and the second protrusion 122 is not limited. Furthermore, the shapes of the first protrusion 121 and the second protrusion 122 are not limited.

[0023] 4, the first protrusion 121 includes a first protrusion 1211 inside the first protrusion 121. The second protrusion 122 includes a second protrusion 1221 inside the second protrusion 122. The first protrusion 1211 is disposed above the second protrusion 1221. The first protrusion 1211 and the second protrusion 1221 are formed to protrude inward.

[0024] 1 and 2, the first protrusion 1211 and the second protrusion 1221 are disposed near the center of the first protrusion 121 and the second protrusion 122, respectively, but they may also be disposed near the ends of the first protrusion 121 and the second protrusion 122, and the locations of the first protrusion 1211 and the second protrusion 1221 are not limited. Furthermore, the shapes of the first protrusion 1211 and the second protrusion 1221 are not limited.

[0025] As shown in FIGS. 1 and 2, the flange portion 13 surrounds the side surface portion 12. As shown in FIG. 3, the flange portion 13 extends outward from the lower end of the side surface portion 12 (the lower end of the second protruding portion 122). The flange portion 13 includes a first horizontal portion 131 extending horizontally, a third protruding portion 132 connected to the horizontal portion, a side wall portion 133 connected to the third protruding portion 132 and extending upward, a chamfered portion 134 connected to the vertical portion 133 and inclined outward, and a second horizontal portion 135 connected to the chamfered portion 134 and extending horizontally. The shape of the flange portion 13 is not limited to this.

[0026] <Effects of this embodiment> 5 and 6 are cross-sectional views of the lid body 1 when the lid bodies 1 are stacked. Fig. 5 is a cross-sectional view of the lid body 1 in a region where the first protrusion 121 and the second protrusion 122 do not include the first protrusion 1211 and the second protrusion 1221, respectively. Fig. 6 is a cross-sectional view of the lid body 1 in a region where the first protrusion 121 and the second protrusion 122 include the first protrusion 1211 and the second protrusion 1221, respectively.

[0027] 5, when the lid bodies 1 are stacked, the first protrusion 121 of the lower lid body 1 fits into the second protrusion 122 of the upper lid body 1, and a part of the outer side of the first protrusion 121 of the lower lid body 1 abuts against a part of the inner side of the second protrusion 122 of the upper lid body 1. This ensures a certain distance between the upper lid body 1 and the lower lid body 1, thereby preventing the lid bodies 1 from blocking each other.

[0028] 6, in the region where the first protrusion 121 on the lower lid body 1 and the second protrusion 122 on the lower lid body 1 abut, the second protrusion 1221 on the upper lid body 1 fits into the first protrusion 1211 on the lower lid body 1, and a part of the inner side of the second protrusion 1221 on the upper lid body 1 abuts against a part of the outer side of the first protrusion 1211 on the lower lid body 1. This suppresses lateral displacement of the lid body 1, thereby preventing blocking of the lid body 1.

[0029] Furthermore, as shown in Figures 5 and 6, the direction in which the first protrusion 121 on the lower lid body 1 enters the second protrusion 122 on the upper lid body 1 is opposite to the direction in which the second protrusion 1221 on the upper lid body 1 enters the first protrusion 1211 on the lower lid body 1, thereby suppressing lateral displacement of the lid body 1 and preventing blocking of the lid body 1.

[0030] 5, a part of the outer side of the third protrusion 132 on the upper lid 1 abuts against a part of the inner side of the chamfered portion 134 on the lower lid 1. This suppresses lateral displacement of the lid 1, thereby preventing blocking of the lid 1.

[0031] <Modification> In the above embodiment, the case where the shape of the flat portion 11 is rectangular in a plan view has been described, but when the shape of the flat portion 11 is circular in a plan view, the side portion 12 may have first protrusions 121 and second protrusions 122 at at least three locations on the periphery of the flat portion 11. In this case, the lower lid body 1 supports the upper lid body 1 at at least three locations, thereby preventing blocking of the lid bodies 1.

[0032] Furthermore, in the above embodiment, the first protrusion 1211 and the second protrusion 121 are formed to protrude inward, but the first protrusion 1211 and the second protrusion 1221 may be formed to protrude outward. In this case, in the region where the first protrusion 121 of the lower cover 1 and the second protrusion 122 of the lower cover 1 abut, the first protrusion 1211 of the lower cover 1 fits into the second protrusion 1221 of the upper cover 1, and a part of the outer side of the second protrusion 1221 of the lower cover 1 abuts against a part of the inner side of the second protrusion 1221 of the upper cover 1.

[0033] <Container body> A container body according to one embodiment of the present invention will be described. Fig. 7 is a perspective view showing the container body 2. Fig. 8 is a plan view showing the container body 2. Fig. 9 is a cross-sectional view of the container body 2 taken along line VI-VI in Fig. 8. Fig. 10 is a cross-sectional view of the container body 2 taken along line XX in Fig. 8. In a plan view of the container body 2, the side on which the flat portion 21 is located is referred to as the inside, and the side opposite the inside (the side on which the flat portion 21 is not located) is referred to as the outside. In a cross-sectional view of the container body 2, the side on which the flange portion 23 is located is referred to as the upper side, and the side opposite the upper side (the side on which the flat portion 21 is located) is referred to as the lower side.

[0034] 7 and 8, the container body 2 includes a flat surface portion 21, a side surface portion 22 surrounding the flat surface portion 21, and a flange portion 23 surrounding the side surface portion 22. Examples of materials for the container body 2 include synthetic resins. Examples of synthetic resins include a mixture of polypropylene (PP) and inorganic filler (talc), PS (HIPS), or PET. The container body 2 can be molded from a synthetic resin sheet by methods such as vacuum molding, hot plate pressure molding, vacuum pressure molding, and double-sided vacuum molding.

[0035] Examples of the shape of the flat surface portion 21 include a rectangle, a square, a polygon, and a circle in a plan view. When the shape of the flat surface portion 21 is a rectangle in a plan view, the corners 21c of the flat surface portion 21 may be rounded as shown in Fig. 8 .

[0036] 7 and 8, the side surface portion 22 surrounds the flat surface portion 21. Furthermore, the side surface portion 22 extends upward from the peripheral edge of the flat surface portion 21, as shown in Fig. 9. The side surface portion 22 includes an inclined portion 223 that is inclined outward.

[0037] As shown in Fig. 9, the side surface portion 22 has, in order from the flat surface portion 21 side, a first protrusion 221 and a second protrusion 222. In Fig. 9, the first protrusion 221 is disposed below the second protrusion 222. The shape of the side surface portion 22 is not limited to this.

[0038] 8, the side surface portion 22 has a first protrusion 221 and a second protrusion 222 at each of the four corners 21c of the flat surface portion 21. The side surface portion 22 can have the first protrusion 221 and the second protrusion 222 at at least one corner 21c. Alternatively, the side surface portion 22 may have the first protrusion 221 and the second protrusion 222 at two opposing corners 21c. The side surface portion 22 may have the first protrusion 221 and the second protrusion 222 not only at the corners 21c of the flat surface portion 21 but also on the short sides and long sides of the flat surface portion 21.

[0039] As shown in Fig. 9, the first protrusion 221 and the second protrusion 222 are each formed to protrude outward. In Fig. 9, the first protrusion 221 and the second protrusion 222 are arranged so as to be continuous at the upper end of the inclined portion 223, but they may also be arranged so as to be discrete at the side portion 22, and the arrangement of the first protrusion 221 and the second protrusion 222 is not limited. Furthermore, the shapes of the first protrusion 221 and the second protrusion 222 are not limited.

[0040] 10, the first protrusion 221 includes a first protrusion 2211 inside the first protrusion 221. Furthermore, the second protrusion 222 includes a second protrusion 2221 inside the second protrusion 222. The first protrusion 2211 is disposed above the second protrusion 2221. The first protrusion 2211 and the second protrusion 2221 are formed to protrude inward.

[0041] 7 and 8, the first protrusion 2211 and the second protrusion 2221 are disposed near the center of the first protrusion 221 and the second protrusion 222, respectively, but they may also be disposed near the ends of the first protrusion 221 and the second protrusion 222, and the arrangement of the first protrusion 2211 and the second protrusion 2221 is not limited. Furthermore, the shapes of the first protrusion 2211 and the second protrusion 2221 are not limited.

[0042] 7 and 8, the flange portion 23 surrounds the side surface portion 22. As shown in FIG. 9, the flange portion 23 extends outward from the upper end of the side surface portion 22 (the upper end of the second protruding portion 222). The flange portion 23 includes a first horizontal portion 231 extending horizontally, a side wall portion 233 connected to the first horizontal portion 231 and extending upward, a third protruding portion 232 connected to the side wall portion 232, a chamfered portion 234 connected to the third protruding portion 232 and inclined outward, and a second horizontal portion 235 connected to the chamfered portion 234 and extending horizontally. The shape of the flange portion 23 is not limited to this.

[0043] <Effects of this embodiment> 11 and 12 are cross-sectional views of the container body 2 when the container bodies 2 are stacked. Fig. 11 is a cross-sectional view of the container body 2 in a region where the first protrusion 221 and the second protrusion 222 do not include the first protrusion 2211 and the second protrusion 2221, respectively. Fig. 12 is a cross-sectional view of the container body 2 in a region where the first protrusion 221 and the second protrusion 222 include the first protrusion 2211 and the second protrusion 2221, respectively.

[0044] 11, when the container bodies 2 are stacked, the first protrusion 221 of the upper container body 2 fits into the second protrusion 222 of the lower container body 2, and a part of the outer side of the first protrusion 221 of the upper container body 2 abuts against a part of the inner side of the second protrusion 222 of the lower container body 2. This ensures a certain distance between the upper container body 2 and the lower container body 2, thereby preventing the container bodies 2 from blocking each other.

[0045] 12, in the region where the first protrusion 221 on the lower container body 2 and the second protrusion 222 on the lower container body 2 abut against each other, the second protrusion 2221 on the lower container body 2 fits into the second protrusion 2221 on the upper container body 2, and a part of the inner side of the second protrusion 2221 on the lower container body 2 abuts against a part of the outer side of the first protrusion 2211 on the upper container body 2. This suppresses lateral displacement of the container body 2, thereby preventing blocking of the container body 2.

[0046] Furthermore, as shown in Figures 11 and 12, the direction in which the first protrusion 221 on the upper container body 2 enters into the second protrusion 222 on the lower container body 2 is opposite to the direction in which the second protrusion 2221 on the lower container body 2 enters into the second protrusion 2221 on the upper container body 2, so lateral displacement of the container body 2 is further suppressed, and blocking of the container body 2 can be prevented.

[0047] 11, a part of the outer side of the third protrusion 232 of the upper container body 2 abuts against a part of the inner side of the chamfered portion 234 of the lower container body 2. This suppresses lateral displacement of the container body 2, thereby preventing blocking of the container body 2.

[0048] <Modification> In the above embodiment, the case where the shape of the flat portion 21 is rectangular in a plan view has been described, but when the shape of the flat portion 21 is circular in a plan view, the side portion 22 may have a first protrusion 221 and a second protrusion 222 at at least three locations on the periphery of the flat portion 21. In this case, the lower container body 2 supports the upper container body 2 at at least three locations, thereby preventing blocking of the container bodies 2.

[0049] Furthermore, in the above-described embodiment, the first protrusion 2211 and the second protrusion 2221 are formed to protrude inward, but the first protrusion 2211 and the second protrusion 2221 may be formed to protrude outward. In this case, in the region where the first protrusion 221 on the lower container body 2 and the second protrusion 222 on the lower container body 2 abut against each other, the first protrusion 2211 on the upper container body 2 fits into the second protrusion 2221 on the lower container body 2, and an outer portion of the first protrusion 2211 on the upper container body 2 abuts against an inner portion of the second protrusion 2221 on the lower container body 2.

[0050] The present embodiment has been described above, but other effects and advantages brought about by the aspects described in the present embodiment that are clear from the description in this specification or that can be appropriately conceived by a person skilled in the art are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0051] 1 Lid 2 Container body 11, 21 Plane section 12, 22 Side part 121, 221 First protrusion 122, 222 Second protrusion 1211, 2211 First protrusion 1221, 2221 Second protrusion

Claims

1. A packaging container comprising a flat surface and a side surface surrounding the flat surface, the side surface portion has a first protrusion and a second protrusion in this order from the flat surface portion side, the first protrusion includes a first projection, the second protrusion includes a second protrusion, When the packaging containers are stacked, a portion of the outer side of the first protrusion on one of the packaging containers abuts a portion of the inner side of the second protrusion on the other of the packaging containers, and a portion of the first protrusion on the one of the packaging containers abuts a portion of the second protrusion on the other of the packaging containers.

2. The shape of the planar portion is quadrangular in plan view, The packaging container according to claim 1 , wherein the side surface portion has the first protrusion and the second protrusion at at least two opposing corners of the flat surface portion.

3. the shape of the planar portion is circular in plan view, The packaging container according to claim 1 , wherein the side surface portion has the first protrusion and the second protrusion at at least three locations on the flat surface portion.

4. The packaging container according to claim 1 , wherein the packaging container is a lid.

5. The packaging container according to claim 1 , wherein the packaging container is a container body.

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