Lid for packaging container and packaging container

Abstract

To provide a lid for a packaging container that improves load resistance against a pressing force applied from above the container when applied to an attaching objection container as compared with a conventional product, and a packaging container to be applied.SOLUTION: A packaging container 1 includes: a container 2 having an upper end edge which is a polygonal shape in a plane view; and a lid 3 attached to the container 2. The lid 3 has a top plate part 31 and a side plate part 32 molded from a flexible resin sheet. The side plate part 32 has: a plurality of side plate constituent surfaces 321 whose base edge are connected to a peripheral edge of the top plate part 31; a first reinforcement part 33 provided on the side plate constituent surface 321 and shaped to be able to withstand a pressing force from a direction of the top plate part; a corner part 34 provided between adjacent side plate constituent surfaces 321; a second reinforcement part 35 provided along a longitudinal direction of the corner part 34 and shaped to be able to withstand the pressing force from the direction of the top plate part; and an abutment part 37 provided near a tip of the side plate constituent surface 321 and shaped to be able to abut against the upper end edge of the container 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lid for a packaging container and a packaging container. More specifically, the present invention relates to a lid for a packaging container that, when applied to a container to which the lid is attached, has improved load resistance against a pressing force applied from above the container, compared to conventional products, and a packaging container to which the lid is applied. [Background technology]

[0002] Packaging containers with lids have been manufactured and sold for a long time, and are indispensable in the field of selling food products, particularly prepared dishes. For example, the packaging container shown in the following Non-Patent Document 1 has been proposed as an example of such a packaging container with lid. This packaging container has a lid that is easy to open and close, and the lid is transparent, making it easy to see the contents inside. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Clean Case Lid 30-35 Prepared Food Container Commercial Food Container Commercial Mail Order TOP Commercial Food, Takeout Supplies - Foodom Internet<URL:https: / / www.foodomejapan.com / products / detail.php?product_id=14414> Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional packaging container described in Non-Patent Document 1 (hereinafter sometimes referred to as the "conventional product") has insufficient load-bearing capacity against pressure applied from above the container, and there was a risk that the lid of the packaging container would be crushed, for example, when stacked and displayed in a store.

[0005] The present invention was devised in consideration of the above points, and aims to provide a lid for a packaging container that, compared to conventional products, has improved load-bearing capacity against the pressing force applied from above the container when applied to the container to which it is attached, and a packaging container to which it is applied. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the lid for a packaging container of the present invention is molded from a flexible resin sheet and is applicable to a container to which it is attached whose upper edge is polygonal in plan view, and comprises a top plate portion, a plurality of side plate constituent surfaces whose base edges are connected to the periphery of the top plate portion, a first reinforcing portion provided on the side plate constituent surfaces and shaped to be able to withstand pressing force from the direction of the top plate portion, corners provided between adjacent side plate constituent surfaces, second reinforcing portions provided along the longitudinal direction of the corners and shaped to be able to withstand pressing force from the direction of the top plate portion, and a contact portion provided near the tip of the side plate constituent surface and shaped to be able to abut against the upper edge of the container to which it is attached.

[0007] The present invention is a lid for a packaging container that has a top plate and a side plate, and is open on the opposing side of the top plate. By having the above-mentioned configuration, it can be applied (attached) to the rim portion of the target container whose upper end rim is polygonal in plan view, and thereby can close the target container. In the following explanation of the effects, the lid for the packaging container may be simply referred to as "the lid."

[0008] The lid is molded from a resin sheet, making it easy to process and lightweight. Furthermore, the lid is flexible, so it can be attached to the container while being bent, and the lid has good adhesion between the upper edge of the container and the abutment part.

[0009] Furthermore, by having the above-mentioned first reinforcing portion and second reinforcing portion, when a pressing force is applied from the direction of the top plate, the first reinforcing portion reinforces the side plate constituent surface, and the second reinforcing portion reinforces the corner portion. In other words, the side plate is reinforced in a manner in which the first reinforcing portion and the second reinforcing portion work together, and can withstand pressing force even when applied from the direction of the top plate. The side plate does not bend easily as a whole, and therefore the top and bottom compressive strength of the entire lid is increased, thereby providing a crush prevention effect.

[0010] Thus, the lid for a packaging container of the present invention has improved load-bearing capacity against pressure applied from above the container compared to conventional products that have no reinforcing portion or only one type of reinforcing portion. Furthermore, the lid protects the contents of the target container even when pressure is applied from the top plate direction. For example, if the contents of the target container are food, the lid can prevent the food from being damaged by a crushed top plate or side plate, or the inside of the top plate or side plate from being soiled by food adhering to the inside, which can lead to a poor appearance, and can also prevent a decrease in product value due to these factors.

[0011] Furthermore, the above-mentioned lid for a packaging container may have a structure in which the first reinforcing portion has, when viewed from the front of the side plate constituent surface, trapezoidally protruding convex portions and inverted trapezoidally recessed concave portions that are alternately arranged continuously in the width direction of the side plate constituent surface.

[0012] According to the packaging container lid of this aspect, the first reinforcing part has a structure based on the above-mentioned shape, which further improves the load resistance against the pressing force from the direction of the top plate. Furthermore, according to the lid, the first reinforcing part has a structure based on the above-mentioned shape, which makes it easy to separate from the mold during processing, thereby improving production efficiency.

[0013] Furthermore, the above-mentioned lid for a packaging container may have a structure in which the abutment portion has an engaging portion that can engage with the upper edge of the container to be attached, and the engaging portion includes a first engaging portion that protrudes in a claw-like shape along the tip edge of the concave portion of the first reinforcing portion, and a second engaging portion that protrudes in a claw-like shape along the tip edge of the corner portion.

[0014] According to this embodiment of the lid for a packaging container, by having the aforementioned fitting portion as the abutment portion, it can be securely fitted to the upper edge of the container to be attached, preventing the lid from shifting horizontally when attaching to the container or the lid from coming off unintentionally.

[0015] Incidentally, some conventional packaging containers have a structure in which the fitting portion of the lid fits around the entire top edge of the container, and while this structure makes it less likely for the lid to come off unexpectedly, it has the problem of being difficult to remove even when you want to take out the contents, etc. In contrast, in the packaging container lid of this embodiment, the fitting portion is made up of a first fitting portion and a second fitting portion, and fits around the top edge of the container to which it is attached partially (discontinuously) rather than continuously around the entire side, thereby minimizing the fitting with the container edge and making it easier to remove the lid from the container to which it is attached.

[0016] Furthermore, the above-mentioned lid for a packaging container may have a chamfered corner, and the second reinforcing portion may have a structure in which, when viewed from the front of the corner, a plurality of convex and concave ridges are arranged so that their longitudinal direction is aligned with the longitudinal direction of the corner, and are alternately arranged continuously in the width direction of the corner.

[0017] According to the packaging container lid of this embodiment, the chamfered corners give the lid a softer appearance and improved design. If the corners were simply flat, buckling in the transverse direction of the corners could occur when pressure from the top plate was applied. However, the provision of the second reinforcing portion with the above-described shape improves the buckling load of the corners, and in combination with the first reinforcing portion, improves the load-bearing capacity of the lid as a whole. Furthermore, because the second reinforcing portion has a relatively simple structure consisting of the above-described multiple ridges and recesses, its shape makes it easy to separate from the mold during processing, resulting in good production efficiency.

[0018] Furthermore, the above-mentioned lid for a packaging container may have a corner portion having a flat portion at the tip portion on the abutment side, the flat portion being a surface approximately parallel to the top plate portion, and additional reinforcing portions having multiple convex ridges formed on the outer surface.

[0019] According to the present embodiment, the lid for a packaging container has a flat portion at the tip of the corner that is the contact portion side, which makes the lid easy to remove. Specifically, when removing the lid, by applying force to the flat portion and causing it to bend slightly, the lid rises from the corner of the container to which it is attached, creating a gap, which makes it easy to remove the lid from this point.

[0020] However, the inventor created a prototype in which a second reinforcing portion was provided at the corner portion and no additional reinforcing portion was provided at the flat portion, and when he conducted usage tests on the prototype, including load-bearing capacity tests, he found that the flat portion sometimes broke.

[0021] The cause of this phenomenon is not entirely clear, but since the corners are reinforced with the second reinforcing section and the flat section extends to the corners, it is assumed that the pressing force applied to the corners from the direction of the top plate tends to flow to the flat section, which is a relatively weak part, causing stress to concentrate on the flat section and cause the breakage.

[0022] However, since the lid has the aforementioned additional reinforcing portion on the flat portion, the flat portion is also reinforced, making it less likely for the flat portion to break due to a load from above.

[0023] Furthermore, the inventors created a prototype with additional reinforcing parts in the form of multiple granular parts or a mesh shape, and conducted usage tests on the prototype, including load-bearing capacity tests.Although it was possible to prevent the flat part from breaking to some extent, it was predicted that the mold required to form the shape would become more complex and that the defect rate would increase during mass production.

[0024] For this reason, the inventors created a prototype with an additional reinforcing portion in the form of a convex rib, and conducted usage tests on the prototype, including load-bearing capacity tests. As a result, the prototype demonstrated sufficient reinforcing performance, making it possible to simplify the mold for forming the desired shape to some extent, and predicting a reduction in the rate of defects during mass production.

[0025] In other words, according to this embodiment of the lid for a packaging container, the additional reinforcing part has the structure described above, which improves production efficiency and reduces the rate of defects during mass production (improves yield rate) compared to additional reinforcing parts of other shapes, etc.

[0026] In addition, the term "flat portion" and "a surface that is approximately parallel to the top plate portion" are used to mean not only the case where the flat portion and the top plate portion are completely parallel surfaces, but also the case where the flat portion is inclined upward at an angle of 10 degrees or less, or downward at an angle of 10 degrees or less, with the top plate portion as the reference (0 degrees).

[0027] In addition, the above-mentioned lid for a packaging container may be configured such that the longitudinal direction of the convex ribs in the additional reinforcing portion is arranged in a direction that intersects with the long axis extension line of the multiple convex ribs and concave ribs in the second reinforcing portion.

[0028] According to the packaging container lid of this aspect, the additional reinforcing portion provided on the flat portion is of the above-mentioned aspect, so that the strength of the flat portion is further improved.

[0029] However, when a pressing force is applied from the direction of the top plate, the force flows downward along the extension of the long axis of the convex and concave stripes of the second reinforcing part, causing stress to concentrate on the flat part, which can cause streaky bending or cracking along the extension of the long axis of the convex and concave stripes.In contrast, the additional reinforcing part of the lid, by adopting the above-mentioned configuration, serves as a resistance part (stop part) to the flow of force downward along the extension of the long axis of the convex and concave stripes of the second reinforcing part, making it possible to more effectively prevent bending or cracking from occurring in the flat part.

[0030] Furthermore, the above-mentioned lid for a packaging container may have a top plate portion whose upper surface area is large enough to fit within the inner area of ​​a platform provided on the bottom surface of the container to which it is attached, and a platform locking portion capable of locking the platform may be formed at the boundary between the top plate portion and the side plate portion.

[0031] According to this type of lid for packaging containers, the top plate portion is the above-mentioned size and is formed with a platform locking portion, so that containers to which the lid is attached can be placed on top of the top plate of other lids.Furthermore, by locking the platform of the upper container with the platform locking portion of the lid of the lower container when placing them, the stacked containers can be secured in place so that they do not collapse.

[0032] Furthermore, the above-mentioned lid for a packaging container may be one in which at least the top plate portion is transparent or semi-transparent so that the inside can be seen.

[0033] The packaging container lid of this aspect has the above-mentioned structure, which allows the contents to be seen from outside the container. Therefore, for example, when the packaging container is used for food, it can stimulate the desire and appetite of customers at the store.

[0034] In order to achieve the above-mentioned effects, it is preferable that at least the top panel be made transparent or translucent so that the interior can be seen, and both the top panel and the side panel may be made transparent or translucent. Furthermore, the top panel or the side panel may have an opaque portion in part.

[0035] Furthermore, the above-described packaging container lid may be one in which the side plate constituent surface of the side plate portion is shaped to slope downward so as to gradually widen toward the leading edge.

[0036] The packaging container lid of this embodiment has the above-mentioned shape, and therefore can be obtained in an overall view in which the lid has a rectangular truncated cone shape (trapezoidal in side view) that conforms to the shape of the upper edge of the container when viewed from above with the opening facing downwards. Compared to lids with upright side panels, this shape of the packaging container lid has a graceful appearance and a large internal volume.

[0037] The aforementioned "frustum-shaped pyramid" is used to mean a shape having a base that corresponds to the number of corners on the upper rim of the container to be attached, with the side panel component surface having a trapezoidal shape and an opening on the opposite side of the top plate. For example, the shape may be a triangular or quadrangular pyramid, as well as a regular polygonal or polygonal truncated pyramid, or an irregular polygonal or pyramidal shape.

[0038] In order to achieve the above-mentioned object, the packaging container of the present invention comprises a container having an upper edge that is polygonal in a planar view; a top plate portion and side plate portion molded from a flexible resin sheet, the side plate portion having a plurality of side plate constituent surfaces whose base edges are connected to the periphery of the top plate portion, a first reinforcing portion provided on the side plate constituent surfaces and shaped to be able to withstand pressing force from the direction of the top plate portion, corners provided between adjacent side plate constituent surfaces, second reinforcing portions provided along the longitudinal direction of the corners and shaped to be able to withstand pressing force from the direction of the top plate portion, and an abutment portion provided near the tip of the side plate constituent surface and shaped to be able to abut against the upper edge of the container, and a lid attached to the container.

[0039] The present invention is capable of storing an object by comprising a container having the above-described configuration and a lid for closing the container.

[0040] The lid, with its aforementioned configuration, can be applied (attached) to the rim portion of a container whose upper rim is polygonal in plan view. Furthermore, since the lid is molded from a resin sheet, it can be easily processed and made into a lightweight product. Furthermore, since the lid is flexible, it can be attached to the container while being bent, and good adhesion is achieved between the upper rim of the container and the abutment portion.

[0041] Furthermore, by having the above-mentioned first reinforcing portion and second reinforcing portion, when a pressing force is applied from the direction of the top plate, the first reinforcing portion reinforces the side plate constituent surface, and the second reinforcing portion reinforces the corners. In other words, the side plate is reinforced in a manner in which the first reinforcing portion and the second reinforcing portion work together, and even if a pressing force is applied from the direction of the top plate, it can withstand this. Since the side plate as a whole does not easily bend, the top and bottom compressive strength of the entire lid is increased, thereby providing a crush prevention effect.

[0042] In this way, the lid has improved load resistance against pressure applied from above the container compared to conventional products that have no reinforcing part or only one type of reinforcing part. Furthermore, with the packaging container of the present invention equipped with this lid, the contents stored in the container are protected even if pressure is applied from the direction of the top plate.

[0043] For example, with the packaging container of the present invention, when the contents contained in the container are plated food, it is possible to prevent the food from being spoiled by a crushed top or side panel, or the inside of the top or side panel from becoming soiled and unsightly due to food adhering to the inside, and it is also possible to prevent a decrease in commercial value due to this.

[0044] The terms used in the above description of each invention have the following meanings:

[0045] The "container to be attached" described above may have at least a polygonal top edge in a plan view, and the bottom surface may have a different shape from the top edge. Furthermore, the "chamfered shape" described above refers to a shape that has been chamfered, and may be either flat or curved, and may have either a raised or recessed surface.

[0046] The aforementioned "first reinforcing portion" may be provided across the width of the side plate constituent surface. With this structure, the reinforcing effect extends to the entire side plate constituent surface, further increasing the load-bearing capacity. [Effects of the Invention]

[0047] According to the present invention, it is possible to provide a lid for a packaging container that, when applied to a container to which it is attached, has improved load-bearing capacity against the pressing force applied from above the container, compared to conventional products, and a packaging container to which this lid is applied. [Brief explanation of the drawings]

[0048] [Figure 1] 1 is a perspective view showing a packaging container according to the present invention. [Figure 2] FIG. 2 is a perspective view showing the packaging container of FIG. 1 with the lid and the container separated. [Figure 3] 2 is a cross-sectional view of the packaging container shown in FIG. 1 along the line AA. [Figure 4] 2A and 2B are views of the packaging container shown in FIG. 1, in which (a) is a perspective view from above, (b) is a side view, and (c) is a perspective view from the bottom. [Figure 5] FIG. 2 is a perspective view showing the lid of FIG. 1. [Figure 6] FIG. 2 is a side view showing the lid of FIG. [Figure 7] FIG. 2 is a plan view showing the lid of FIG. [Figure 8] The lid of Figure 1 is partially enlarged, with (a) being an enlarged view of the corner, (b) being an enlarged view of the back side of the lid, and (c) being an explanatory diagram showing a cross-sectional view of the state in which the contact part of the lid contacts the upper edge of the container. [Figure 9](a) is a plan view showing cross-sectional portions B to E of the packaging container shown in Figure 1, (b) is a BB cross-sectional view, (c) is a CC cross-sectional view, (d) is a DD cross-sectional view, and (e) is an EE cross-sectional view. [Figure 10] 2A and 2B are side views showing two packaging containers of FIG. 1 stacked vertically, where (a) is an overall side view and (b) is an enlarged view of the vicinity of the left end of (a). [Figure 11] 2A and 2B are cross-sectional side views showing three packaging containers of FIG. 1 stacked vertically, where (a) is an overall cross-sectional view and (b) is an enlarged view of the vicinity of the left end of (a). [Figure 12] 5 is a bottom view of another embodiment (modification 1) of the container shown in FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0049] The embodiments of the present invention will be described in more detail with reference to Figures 1 to 12. The following description will be given in the order of [First Embodiment] and [Modification 1]. Furthermore, the reference numerals in each drawing are assigned within the scope of reducing complexity and facilitating understanding, and in some cases, the same reference numerals are assigned to only some of the equivalent parts.

[0050] [First embodiment] (Packaging container 1) 1 to 3, the packaging container 1 comprises a container 2 and a lid 3 attached to the container 2. Each part will be described in detail below.

[0051] (container 2) See Figure 4. Container 2 is a high-rimmed plate with a rectangular rim and bottom, i.e., it corresponds to the "container with a polygonal upper rim in plan view" mentioned above. Container 2 is made of synthetic resin, and has a ripple-like texture with a satin finish on the inner bottom surface, and a tea towel-like pattern with a satin finish on the side (the area from the bottom to the rim), recreating the texture of a ceramic plate.

[0052] The container 2 has a base 21 on its outer bottom surface (the surface that becomes the underside of the bottom when in use). The base 21 has a roughly rectangular outline in plan view, with the four corners cut out (cutout portions 22), or in other words, it is composed of four linear bases with the four corners open (see FIGS. 4(b)-(c) and FIG. 9(d)).

[0053] In this embodiment, the base 21 has four corners cut out, but this is not limited to this. For example, in the case of other shapes (triangle, pentagon, etc.), the corners may be cut out, and on the other hand, this does not exclude a configuration in which the corners of the base are partially cut out or not cut out at all.

[0054] Although not shown in the drawings in this embodiment, the surface (particularly the inner bottom and inner surfaces) of the container 2 may be colored in a color that reproduces the texture of pottery, or may be printed with a traditional Japanese or Western pattern. In this embodiment, the synthetic resin used for the container 2 can be changed appropriately depending on the properties of the contents, and may be, for example, GPPS (polystyrene), HIPS (high impact polystyrene), PP (polypropylene), PPT (talc-blended polypropylene), etc. Furthermore, although the container 2 is colored in this embodiment, the container may be partially or entirely transparent.

[0055] (Lid 3) Please refer to Figures 1 to 9 (particularly Figures 5 to 8). The lid 3 has a top plate portion 31 and a side plate portion 32, and is structured so that the top plate portion 31 is open on the opposing side. In this embodiment, the top plate portion 31 and the side plate portion 32 are molded from a flexible, transparent thermoplastic resin sheet. The lid 3 is the aforementioned "lid for a packaging container," and each part will be described in detail below.

[0056] The top plate 31 is a flat, roughly square shape, more specifically an octagon with the corners of a square rounded off (see FIGS. 5 and 7). In this embodiment, the area of ​​the top surface 311 of the top plate 31 is sized to fit within the inner area of ​​the platform 21 provided on the bottom surface of the container 2, and a platform locking portion 312 capable of locking the platform 21 is formed at the boundary between the top plate 31 and the side plate 32 (see FIGS. 5 to 7).

[0057] The side plate portion 32 has a side plate constituent surface 321, a first reinforcing portion 33, a corner portion 34, a second reinforcing portion 35, a flat portion 36, a contact portion 37, and a hanging portion 39 (see FIGS. 5 to 8).

[0058] The side panel constituent surfaces 321 have a base edge connected to the long side peripheral edge of the top panel portion 31, and have a downward sloping shape that gradually widens toward the tip edge, and in this embodiment there are four surfaces (the aforementioned ``multiple side panel constituent surfaces'') (see Figure 7).

[0059] The first reinforcing portions 33 are provided on each of the side plate constituent surfaces 321, and are shaped to be able to withstand pressing forces from the direction of the top plate portion 31. In this embodiment, the first reinforcing portions 33 have a structure in which, when viewed from the front of the side plate constituent surfaces 321, trapezoidally protruding convex portions 331 and inverted trapezoidally recessed concave portions 332 are alternately and continuously provided in the width direction of the side plate constituent surfaces 321 (see FIGS. 5 to 7).

[0060] The corners 34 are provided between adjacent side plate constituent surfaces 321. In this embodiment, the corners 34 have a chamfered shape, and are provided with second reinforcing portions 35 on the surface and flat portions 36 on the tip portions that face the abutting portion 37 (see FIGS. 5 to 8(a)).

[0061] The second reinforcing portion 35 is provided along the longitudinal direction of the surface of the corner portion 34, and is shaped to be able to withstand pressing force from the direction of the top plate portion 31. In this embodiment, the second reinforcing portion 35 has a structure in which four convex ridges 351 are provided with their longitudinal directions aligned with the longitudinal direction of the corner portion 34, and three concave ridges 352 located between the convex ridges 351 (the above-mentioned "structure in which a plurality of convex ridges and concave ridges are provided alternately and continuously in the lateral width direction of the corner portion").

[0062] Each of the protrusions 351 has a shape in which the portion near the upper end in the longitudinal direction is cut diagonally, and its tip is connected to the upper surface 311 of the top plate portion 31, and its lower end in the longitudinal direction is connected to the starting end of the flat portion 36 (see Figures 5 to 8(a)).

[0063] The flat portion 36 is a surface (a stepped plane) that is approximately parallel to the top plate portion 31, and an additional reinforcement portion 361 (the aforementioned "additional reinforcement portion with multiple convex strips") consisting of three convex strips 362 is provided on the upper outer surface of the flat portion 36 (see Figures 5, 7, and 8(a)).

[0064] In this embodiment, one of the above-mentioned convex ribs 362 is disposed on the tip side of the flat portion 36, and two are disposed on the base side (closer to the second reinforcing portion 35) of the flat portion 36. The two convex ribs 362 on the base side of the flat portion 36 are shorter than the convex ribs 362 on the tip side, and are disposed on the same line with a small gap between them. The longitudinal direction of the convex ribs 362 constituting the additional reinforcing portion 361 is disposed in a direction intersecting with the long axis extension lines of the multiple convex ribs 351 and concave ribs 352 associated with the second reinforcing portion 35 (see FIG. 8(a)).

[0065] The contact portion 37 is provided near the tip of the side plate constituent surface 321, has a flat shape that can come into contact with the upper edge of the container 2, and is continuous with the flat portion 36 (see FIGS. 5 to 8(a)). In this embodiment, the contact portion 37 has a fitting portion 38 that can fit over the upper edge of the container 2.

[0066] The fitting portion 38 has a structure including a first fitting portion 381 and a second fitting portion 382. The first fitting portion 381 protrudes in a claw shape along the tip edge of the recessed portion 332 of the first reinforcing portion 33 (see FIGS. 8(a) to 8(c)). The second fitting portion 382 protrudes in a claw shape along the tip edge of the corner portion 34 (see FIGS. 8(a) to 8(b)).

[0067] Hanging portion 39 is connected to the tip of contact portion 37 and hangs down in the opposite direction from top plate portion 31, and is shaped so as to be able to fit onto the upper lip of container 2 (see FIGS. 5 to 8).

[0068] In this embodiment, the lid 3 is transparent, but this is not limited to this and may be translucent or colored, or may be made by printing a pattern or design such as a temari (Japanese ball) pattern on a transparent resin sheet of the same type and then bonding them together with heat.

[0069] The synthetic resin used for the lid 3 can be changed as appropriate depending on the properties of the contents, etc., and is not particularly limited, but examples include OPS sheet (registered trademark: biaxially oriented polystyrene sheet), A-PET (Amorphous-PET) sheet, and Bio-A-PET sheet (approximately 25% bio-based material).

[0070] The thickness of the resin sheet of the lid 3 can be changed as appropriate depending on the size (length and depth) of the product, and is not particularly limited, but is preferably 0.15 to 0.55 micrometers, for example, in consideration of flexibility, manufacturing costs, and weight. If it is less than 0.15 micrometers, it is not preferred because it has sufficient flexibility but insufficient strength, while if it exceeds 0.55 micrometers, it is not preferred because it has sufficient strength but is not flexible enough, and manufacturing costs and weight become excessive.

[0071] The method for forming the lid 3 is not particularly limited, and for example, in the case of an OPS sheet or a bio A-PET sheet, a hot plate compressed air forming method may be used, and in the case of A-PET, a vacuum forming method may be used.

[0072] (effect) The effects of the packaging container 1 including the lid 3 will be described with reference to FIGS.

[0073] The packaging container 1 comprises the container 2 and lid 3 configured as described above, and can contain food or other objects by placing the object in the container 2 and then attaching the lid 3 to the rim of the container 2 to close it (see Figures 1 and 2). As described above, the container 2 also reproduces the texture of a ceramic plate, giving a sense of luxury when food is contained inside. Furthermore, the raised base 21 on the bottom surface contributes to reproducing the texture of a ceramic plate (see Figures 1, 2, and 4).

[0074] The lid 3 is molded from a resin sheet, which makes it easy to process and lightweight. Furthermore, the lid 3 has flexibility due to the resin sheet, so it can be attached to the container 2 while being bent, and there is good adhesion between the upper edge of the container 2 and the contact portion 37 (see Figures 8(c), 10(b), and 11(b)).

[0075] Furthermore, since the entire surface of the lid 3 (top panel portion 31 and side panel portion 32) is transparent, the contents can be seen from the outside. For example, when the packaging container is used for food, this can stimulate the desire to purchase and the appetite of customers at the store (see Figures 1 and 9).

[0076] The contents of the packaging container 1 can be seen through the top plate portion 31 (see FIGS. 1 and 9). Furthermore, since the top plate portion 31 has the above-mentioned upper surface 311 and platform locking portion 312, other packaging containers 1 can be placed on top of the lid 3 (see FIGS. 10(a) and 11(b)), and further, by locking the platform 21 of the other packaging container 1 positioned above with the platform locking portion 312 of the packaging container 1 positioned below when the containers are placed, the stacked containers can be fixed in place so that they do not collapse (see FIGS. 10(b) and 11(b)).

[0077] The lid 3 has the side plate constituent surface 321 of the shape described above, so that it has an elegant appearance and looks good, and the internal volume can be made large.

[0078] The first reinforcing portion 33 has a structure based on the above-described shape, which further improves the load resistance against pressing force from the top plate direction. More specifically, the first reinforcing portion 33 has a structure in which convex portions 331 and concave portions 332, which can be considered pillar-like, are alternately and continuously provided across the width direction of the side plate constituent surface 321 (see FIGS. 3, 5 to 7). The increased number of pillar-like surfaces distributes the load, making the structure less likely to bend. Furthermore, the concave portions 332 protrude inward, which prevents the container from bulging outward when a load is applied (see FIGS. 5 and 8(b)).

[0079] In other words, the combination of these effects further improves the load resistance against pressure from the top plate direction compared to conventional products (without reinforcement on the side plate component surfaces). Furthermore, because the first reinforcing portion 33 has a structure based on the above-mentioned shape, it is easily separated from the mold during processing, resulting in good production efficiency.

[0080] Abutment portion 37 is provided near the tip of side plate constituent surface 321, and is able to abut against and receive the upper edge of container 2. Hanging portion 39, connected to abutment portion 37, fits over the upper edge of container 2 when attached to container 2, preventing lid 3 from shifting horizontally and coming off (see FIGS. 8(c), 10(b), and 11(b)).

[0081] Furthermore, fitting portion 38, which is composed of first fitting portion 381 of abutting portion 37 and second fitting portion 382 of corner portion 34, can securely fit onto the upper edge of container 2, preventing horizontal displacement of lid 3 when attaching the container and preventing unintentional removal of the lid. In addition, because fitting portion 38 is composed of first fitting portion 381 and second fitting portion 382, ​​which have a structure that provides partial (discontinuous) fitting, fitting with the edge of container 2 is kept to a minimum compared to conventional packaging containers (structures in which the fitting portion of the lid fits onto the entire upper edge of the container), making it easier to remove lid 3 from container 2 (see Figures 3 and 8(b)-(c)).

[0082] The chamfered corners 34 of the lid 3 give the lid 3 a softer appearance and improves its design. The provision of the second reinforcing portions 35 at the corners 34 improves the buckling load of the corners 34, which, in combination with the first reinforcing portions 33, improves the load-bearing capacity of the lid 3 as a whole. Furthermore, the second reinforcing portions 35 have a relatively simple structure consisting of the aforementioned multiple convex and concave ridges, and are shaped to be easily separated from the mold during processing, resulting in good production efficiency (see FIGS. 1-2 and 5-8(a)).

[0083] The lid 3 has a first reinforcing portion 33 and a second reinforcing portion 35, so that when a pressing force is applied from the direction of the top plate 31, the first reinforcing portion 33 reinforces the side plate constituent surface 321, and the second reinforcing portion 35 reinforces the corners 34. In other words, the side plate 32 is reinforced in a manner in which the first reinforcing portion 33 and the second reinforcing portion 35 work together, and even if a pressing force is applied from the direction of the top plate 31, it can withstand this. Furthermore, the side plate 32 as a whole does not easily bend, so that the top and bottom compressive strength of the lid 3 as a whole is increased, and a crushing prevention effect is exhibited.

[0084] As a result, lid 3 has improved load resistance against pressure applied from above the container, compared to conventional products that have no reinforcing part or only one type of reinforcing part. With packaging container 1 equipped with this lid 3, the contents contained in container 2 are protected even when pressure is applied from the direction of top plate 31. For example, if the contents contained in container 2 are plated food, it is possible to prevent the food from being damaged by crushed top plate 31 or side plate 32, or to prevent the inside of top plate 31 or side plate 32 from becoming soiled and becoming unsightly due to food adhering to the inside, and it is also possible to prevent a decrease in commercial value due to this.

[0085] In addition, because lid 3 has flat portions 36 at corners 34, when removing lid 3, applying force to flat portions 36 causes them to bend slightly, which causes them to lift up from the corners of container 2 and create gaps, making it easier to remove lid 3. Furthermore, because flat portions 36 have additional reinforcing portions 361, flat portions 36 are also reinforced, making flat portions 36 less likely to break due to loads from above (see FIGS. 1-2 and 5-8(a)).

[0086] Furthermore, since the flat portion 36 is provided with the additional reinforcing portion 361 of the above-mentioned embodiment, it acts as a resistance portion (stopping portion) to the flow of force that flows downward along the long axis extension line of the convex ribs 351 and concave ribs 352 of the second reinforcing portion 35, and it is possible to prevent bending or cracking from occurring in the flat portion 36, which means that the strength of the flat portion 36 is further improved (see Figures 1 to 2 and Figures 5 to 8(a)).

[0087] As described above, compared to conventional products, the lid 3 has improved load-bearing capacity against the pressing force applied from above the container 2 when applied to the container 2 to which it is attached, and a packaging container 1 using this can be provided.

[0088] Furthermore, for example, if this packaging container 1 is used for food (product), the lid 3 of the packaging container 1 is less likely to be crushed when products are stacked and displayed in stores such as supermarkets and convenience stores, and the display state in which products are stacked vertically is more stable. Furthermore, when replenishing products at supermarkets and the like, more products (packaging containers 1) can be stacked and transported in a stable state. Furthermore, when consumers place the products (packaging containers 1) in their shopping baskets or shopping bags, the products (packaging containers 1) can be prevented from being crushed (see FIGS. 10-11).

[0089] Incidentally, when the above-mentioned stacked display is performed in a mode in which the four corners of the platform are not cut out, the entire platform, including the four corners, must be carefully fitted while visually checking the platform locking portions, or the upper and lower products (packaging containers 1) may easily become disengaged and the stack may collapse. However, because the above-mentioned platform 21 has the four corners cut out (the cutout portions 22 formed) as described above, there is no need to consider locking the four corners, and therefore the operation of locking the platform 21 with the platform locking portions 312 can be easily and quickly performed (see Figures 4(b) to (c) and Figures 10 to 11).

[0090] Furthermore, in this embodiment, the width of the cutout 22 is set to a width that accommodates each of the ridges 351. As a result, the first reinforcing portion 33 in the width direction fits inside the cutout 22, and the side surfaces of the first ridge 351 and the fourth ridge 351 in the width direction abut against the respective ends of the platform 21 that face them, thereby assisting the engagement state in the cutout 22 located at the corner of the platform 21 (see FIG. 10(b)). At this time, each of the ridges 351 has a shape in which the vicinity of the upper end in the longitudinal direction is cut obliquely, making it easy to fit into the cutout 22.

[0091] Furthermore, in this embodiment, each of the protrusions 351 has its tip connected to the upper surface 311 of the top plate portion 31 and its lower end connected to the beginning of the flat portion 36, thereby further improving the load-bearing capacity of the support as a pillar against loads in the longitudinal direction of the corner portion 34.

[0092] [Variation 1] Another aspect (Modified Example 1) of the packaging container 1 will be described with reference to Fig. 12. The packaging container 1 according to Modified Example 1 has the same lid 3 as that of the first embodiment, but is partially different in the configuration of the container 2. As the lid 3 is the same as that of the first embodiment, a description of the structure and effects thereof will be omitted.

[0093] Container 2a is a high-rimmed plate with a rectangular rim and bottom. Made of synthetic resin, container 2a has a rippled pattern with a satin finish on the inner bottom, a brown-striped pattern with a satin finish on the side (the area from the bottom to the rim), and a similar brown-striped pattern with a satin finish on the outer side, recreating the texture of a ceramic plate.

[0094] Furthermore, the container 2a has non-smooth portions 23 on each of its outer side surfaces, which are smooth portions with no satin texture. Here, "smooth" refers to a smooth state completely free of the minute irregularities of the satin texture, but is not limited to this. For example, it may be an aspect in which the irregularities are shallower or less pronounced than those on the outer side surfaces other than the non-smooth portions 23 (i.e., irregularities are present to the extent that the adhesive tape does not lose its adhesive force). Note that this term encompasses both a completely smooth state and the smooth aspects exemplified above, and can also be referred to as "substantially smooth."

[0095] The height direction of the non-matt finish portion 23 extends from the upper edge of the container 2a to the outside of the base pedestal 21. The width direction of the non-matt finish portion 23 extends from the center of the width direction of the outer side surface to an area that is one-third of the length of the width direction of the outer side surface.

[0096] Incidentally, the container 2 shown in Figure 4 has a tea towel-like pattern with a satin finish added to the side (the area from the bottom to the rim), and a similar tea towel-like pattern with a satin finish added to the outer side is also formed.

[0097] When using packaging container 1, in order to ensure that container 2 and lid 3 could be separated, adhesive tape was wrapped around lid 3 and secured to container 2 (tape fastening). However, due to the minute irregularities on the surface of the matte texture mentioned above, the adhesive tape on the container 2 side sometimes peeled off. The peeled adhesive tape could stick to shopping bags, causing discomfort to users.

[0098] In contrast, the container 2a is provided with the aforementioned non-matt finish portion 23, which prevents the adhesive tape from peeling off. On the other hand, because the area where the non-matt finish portion 23 is provided is limited, the matt finish pattern that continues on the outer side surface reproduces the texture of a ceramic plate. In other words, the container 2a achieves both improved convenience and improved appearance. Note that the container 2a is similar to the container 2 of the first embodiment except for the above-mentioned difference (non-matt finish portion 23), and therefore a description of its structure, operation, and effects will be omitted.

[0099] In this modified example, the non-matt-textured portion 23 provided on the container 2a has the configuration described above, but is not limited to this. For example, the non-matt-textured portion may extend to a portion of the height of the outer side surface (such as from the upper lip to halfway up the height of the side surface).

[0100] Furthermore, in this modified example, the non-matt-textured portion is provided with the aforementioned width, but is not limited to this, and for example, it is preferable that the width direction extends to an area that is between one-sixth and one-half of the width direction length of the outer side surface, with the center of the width direction of the outer side surface as the central part.

[0101] If the non-matt finish portion is less than one-sixth of the width of the outer side surface, the width that can be applied is narrow and visual inspection is required when applying the adhesive tape, which is undesirable as it reduces the efficiency of the container sealing process. On the other hand, if the non-matt finish portion is more than half of the width of the outer side surface, the area of ​​the matt finish pattern on the outer side surface becomes narrow, which improves convenience but reduces the appearance, which is undesirable.

[0102] The terms and expressions used in the present specification and claims are merely for explanatory purposes and are not limiting in any way, and are not intended to exclude terms and expressions equivalent to the features described in the present specification and claims or portions thereof. It goes without saying that various modifications are possible within the scope of the technical idea of ​​the present invention. [Explanation of symbols]

[0103] 1 Packaging container 2, 2a container 21 High ground 22 Notch 23 Non-matt textured area 3 Lid 31 Top plate 311 Top surface 312 High platform locking part 32 Side plate part 321 Side plate configuration surface 33 First reinforcement part 331 Convex part 332 Concave part 34 Corner 35 Second reinforcement section 351 Convex strip 352 Concave line 36 Flat area 36 Additional reinforcement 362 Convex strip 37 Contact part 38 Fitting part 381 1st mating part 382 2nd mating part 39 Drooping part

Claims

1. The container is molded from a flexible resin sheet and is applied to a container having a polygonal upper edge in a plan view. The top plate and a side plate portion having a plurality of side plate constituent surfaces whose base edges are connected to the periphery of the top plate portion, a first reinforcing portion provided on the side plate constituent surfaces and shaped to be able to withstand a pressing force from the direction of the top plate portion, corners provided between adjacent side plate constituent surfaces, second reinforcing portions provided along the longitudinal direction of the corners and shaped to be able to withstand a pressing force from the direction of the top plate portion, and an abutment portion provided near the tip of the side plate constituent surface and shaped to be able to abut against the upper end edge of the container to be attached; Equipped with Lid for packaging containers.

2. The first reinforcing portion has a structure in which, when viewed from the front of the side plate constituent surface, trapezoidally protruding convex portions and inverted trapezoidally recessed concave portions are alternately and continuously provided in the width direction of the side plate constituent surface. The lid for a packaging container according to claim 1.

3. The abutting portion has a fitting portion that can fit over the upper edge of the container, and the fitting portion has a structure including a first fitting portion that protrudes in a claw shape along the tip edge of the recessed portion of the first reinforcing portion, and a second fitting portion that protrudes in a claw shape along the tip edge of the corner portion. The lid for a packaging container according to claim 2.

4. The corner portion has a chamfered shape, and the second reinforcing portion has a structure in which a plurality of convex and concave stripes are provided alternately and continuously in the width direction of the corner portion, the convex and concave stripes being aligned along the longitudinal direction of the corner portion when viewed from the front. The lid for a packaging container according to claim 1.

5. The corner portion has a flat portion at the tip portion on the contact portion side, the flat portion being a surface approximately parallel to the top plate portion, and a plurality of convex reinforcement portions are formed on the outer surface. The lid for a packaging container according to claim 4.

6. The longitudinal direction of the convex stripes in the additional reinforcement portion is provided in a direction intersecting with the longitudinal extension line of the plurality of convex stripes and concave stripes in the second reinforcement portion. The lid for a packaging container according to claim 5.

7. The top plate portion has an upper surface area that is sized to fit within the inner area of ​​a platform provided on the bottom surface of the attachment target container, and a platform locking portion that can lock the platform is formed at the boundary between the top plate portion and the side plate portion. The lid for a packaging container according to any one of claims 1 to 6.

8. At least the top panel is transparent or semi-transparent so that the inside can be seen. The lid for a packaging container according to any one of claims 1 to 6.

9. The side plate constituent surface of the side plate portion has a downwardly inclined shape so as to gradually widen toward the tip edge. The lid for a packaging container according to any one of claims 1 to 6.

10. A container having an upper edge with a polygonal shape in a plan view; a lid having a top plate portion and side plate portions molded from a flexible resin sheet, the side plate portions having a plurality of side plate constituent surfaces whose base edges are connected to the periphery of the top plate portion, first reinforcing portions provided on the side plate constituent surfaces and shaped to be able to resist pressing force from the top plate portion direction, corners provided between adjacent side plate constituent surfaces, second reinforcing portions provided along the longitudinal direction of the corners and shaped to be able to resist pressing force from the top plate portion direction, and a contact portion provided near the tip of the side plate constituent surface and shaped to be able to contact the upper end rim of the container, and the lid is attached to the container; Equipped with packaging container.

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