Packaging containers

Abstract

The structure should allow the contents of food or other items to easily gather in the desired location. [Solution] The housing Ma has at least two rib portions 1 provided around a predetermined point on the bottom M1, and the rib portions 1 are formed to gradually decrease in height toward the predetermined point.

Description

Technical Field

[0001] The present invention relates to a packaging container for packaging contents such as food.

Background Art

[0002] Conventionally, packaging containers for packaging foods sold in retail stores such as supermarkets and convenience stores have been designed in view of various factors such as the type, quantity, and price of the above foods, the scene where the above foods are eaten, and the purchaser. That is, since the above retail store selects a packaging container suitable for the above factors, the specifications of the above packaging container have changed along with the needs required by the above retail store.

[0003] For example, Patent Document 1 discloses a packaging container in which convex ribs are formed at the bottom of a food storage portion. The ribs include partitions formed radially in three directions from the center point of the bottom, and ribs formed concentrically around the center point and lower than the partitions. The ribs have a total of three, with each being one of three arc-shaped ribs located in each section partitioned by the partitions.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, Patent Document 1 does not disclose whether the structure of the packaging container is suitable for storing food. Therefore, although the foods stored in each section partitioned by the partitions do not contact or mix with each other due to the partitions, if all the ribs have the same height, the foods placed on the ribs are likely to roll or slide within the section and may tend to be biased toward the side formed near the peripheral edge of the bottom.

[0006] Conventional packaging containers often have a lid that is attached to the container body that holds the food, and they are used to package an amount of food that can accommodate the attachment of the lid. However, in the case of the packaging container disclosed in Patent Document 1, similar to the above-mentioned packaging container, depending on the shape and size of the individual food items, there is a risk that food items that are close to the sides may get caught between the container body and the lid when the lid is attached.

[0007] To address these problems with conventional technology, the inventors concluded that a structure that allows food to easily gather at a desired location within the packaging container is suitable in order to prevent food from accumulating near the sides and to prevent food from being pinched between the container body and the lid when the lid is attached. Furthermore, the inventors reaffirmed that utilizing a convex structure such as the ribs on the bottom where the food is placed is effective in realizing the above structure.

[0008] Furthermore, from the perspective of ease of food preparation and aesthetic appeal on retail shelves and on the customer's table, a structure that allows food to easily gather in desired positions within the packaging container is suitable. For example, if multiple types of food placed in each of the partitioned compartments gather towards the center of the packaging container, and there are no unnecessary gaps between the ingredients of the food, an overall sense of unity can be created as a group of food items, which can be expected to improve the product's value.

[0009] Therefore, the object of the present invention is to provide a packaging container that has a structure that makes it easy for contents such as food to gather in a desired position. [Means for solving the problem]

[0010] In other words, the packaging container in the present invention has at least two rib portions provided around a predetermined point at the bottom of the storage portion, and the rib portions are formed to gradually decrease in height toward the predetermined point.

[0011] The above-mentioned rib portions are provided in groups of three or more, each at a different distance from the predetermined point, and it is desirable that the further away they are from the predetermined point, the further apart they are from each other.

[0012] The above-mentioned rib portions are provided in groups of three or more, each at a different distance from the predetermined point, and it is desirable that the tops of the rib portions lie on the circumference of the same circle or ellipse that traces a trajectory in the vertical direction.

[0013] The rib portion has an inner rib lower end that is provided on the side closer to the predetermined point relative to the top of the rib portion and continuous with the bottom, and an outer rib lower end that is provided on the side further from the predetermined point relative to the top and continuous with the bottom, and it is desirable that the outer rib lower end is smoother than the inner rib lower end when viewed from a vertical end face.

[0014] The rib portion has an inner rib lower end that is provided on the side closer to the predetermined point relative to the top of the rib portion and continuous with the bottom, and an outer rib lower end that is provided on the side further from the predetermined point relative to the top and continuous with the bottom, and it is desirable that the inner rib lower end is smoother than the outer rib lower end when viewed from the vertical end face.

[0015] It is desirable that the rib portion described above is located on the circumference of the same circle or ellipse centered on the predetermined point described above.

[0016] The rib portion described above preferably has a corner that is bent in the lateral direction.

[0017] The container body, which includes the above-mentioned storage section, is equipped with a lid that is attached to the container body, wherein the lid has a lid side portion provided downward from the peripheral edge of the top surface and a flange portion provided outward from the lower end of the lid side portion, and preferably the lid side portion has a lid side portion continuous with the top surface and a lid side bulge portion that is continuous with the lower end of the lid side portion and bulges outward from the lid side portion. [Effects of the Invention]

[0018] According to the present invention, due to the structure that makes it easy for contents such as food to gather at a desired position, it becomes difficult for food to approach the side part, and it becomes difficult for the food to be sandwiched between the container body and the lid when the lid is attached. Also, it is possible to expect an improvement in the workability of packing the food and an improvement in the beauty on the display shelves of retail stores and the dining tables of purchasers.

Brief Description of the Drawings

[0019] [Figure 1] Perspective view of the packaging container in the open lid state in one embodiment of the present invention. [Figure 2] Plan view and front view of the above packaging container. [Figure 3] Partially enlarged end view of the above packaging container. [Figure 4] Partially enlarged end view of the above packaging container. [Figure 5] Perspective view and front view of the packaging container in the closed lid state in one embodiment of the present invention. [Figure 6] Partially enlarged end view of the above packaging container.

Mode for Carrying Out the Invention

[0020] Hereinafter, a packaging container (hereinafter also referred to as "this packaging container") in one embodiment of the present invention will be described while referring to FIGS. 1 to 6. In these figures, for some of the same parts that exist in plural, only one part is numbered. For convenience of explanation, some predetermined parts and drawn lines are shown by hidden lines (broken lines) or imaginary lines (two-dot chain lines), and some cross-sectional parts are shown by hatching. In the description, terms indicating directions such as upward, downward, sideward, vertical direction, horizontal direction, inward direction, outward direction, central direction, circumferential direction, etc. are basically based on the packaging container installed in the normal use orientation. When other orientations are used as the reference, appropriate explanations will be given.

[0021] In the illustration of each figure, a plan view means looking at the above packaging container from above in the upward direction where the projected area is relatively large. Based on the above plan view, a front view means looking at the above packaging container from a predetermined side direction, and an end view means looking only at the end face of a predetermined cut part of the above packaging container.

[0022] In the present invention, "forming" means simply shaping or being shaped without limiting the manufacturing method, and "molding" means shaping by fitting into a predetermined mold or being shaped. In other words, "forming" is an expression that includes "molding". "Outer fitting" or "side outer fitting" refers to a structure in which the fitting part of the fitting side (for example, the lid) is on the inside and the fitting part of the fitted side (for example, the container body) is on the outside. "Inner fitting" refers to a structure in which the fitting part of the fitting side is on the outside and the fitting part of the fitted side is on the inside.

[0023] <Basic Structure of the Packaging Container> As shown in FIGS. 1, FIG. 2, and FIG. 5, the present packaging container is for packaging one or more kinds of foods such as vegetables, bento, sushi, sashimi, and salads sold in retail stores such as supermarkets as contents. It includes a container body M for accommodating the food and a lid N attached to the container body M. The container body M and the lid N are integrally formed via a hinge P. The above-mentioned food may be for normal temperature, frozen, or reheating.

[0024] FIGS. 1 and FIG. 2 show the state where the lid N is opened 180° with respect to the container body M, and FIG. 5 shows the state where the lid N is attached to and closed on the container body M. The present packaging container only needs to be of a size that can be placed on the display shelf in the retail store, and does not limit dimensions such as length, width, and height. The present packaging container may be only the container body M, or may separately include the container body M and the lid N. The present packaging container may refer to the container body M or the set of the container body M and the lid N. The container body M and the lid N may be of an outer fitting type, a side outer fitting type, or an inner fitting type.

[0025] <Overview of the Container Body M> As shown in Figures 1 and 2, the container body M comprises a bottom M1 on which food is placed, a side body M2 formed upward from the circumferential edge of the bottom M1, a flange body M3 formed outward from the opening of the container body M corresponding to the uppermost end of the side body M2, and an unnumbered fitting body portion formed downward from the outermost end of the flange body M3. The container body M has a food storage section Ma formed by the bottom M1 and the side body M2, partition sections Mc formed radially in three directions from the center point Mb of the bottom M1 of the storage section Ma, three storage compartments Md separated by the partition sections Mc, and a total of three rib sections 1 around the center point Mb and for each storage compartment Md, with three pieces forming one set each.

[0026] As shown in Figure 2, the container body M is roughly square in plan view, but it may be rectangular, a rectangular shape with pentagons or more, circular, or elliptical. The container body M is not limited in terms of the shape or area of ​​the bottom M1, the vertical height and inclination angle of the side parts M2, the shape and width of the flange part M3 from the innermost to the outermost end, the shape and height of the fitting part, the capacity of the storage section Ma, or the number and shape of the partition parts Mc. The partition parts Mc only need to divide the storage section Ma into two or more compartments, and these compartments may or may not be equally divided, may not be formed radially from the center point Mb, or may not exist at all.

[0027] <Details of the center point Mb> The center point Mb is the center point of the entire bottom M1, but it may also be the center point of only the bottom M1 within the storage compartment Md partitioned by the partition Mc. When the center point Mb is the above-mentioned center point, it may be referred to as a predetermined point on the bottom M1. The predetermined point on the bottom M1 does not have to be the center point of the bottom M1 or the center point of only the bottom M1 within the storage compartment Md; it may also be the center point relative to the rib portion 1, in other words, it may be the center point that serves as the reference point for the position forming the rib portion 1. That is, the center point Mb may be set as a predetermined point at any position on the bottom M1.

[0028] <Capacity of container body M> The container body M may be, for example, 100 to 1800 cc, or 200 to 1000 cc. The side portion M2 of the body may have one or more predetermined steps or reinforcing ribs, or it may be flush without them.

[0029] <Depth of container body M> The depth of the container body M may be 10 mm to 45 mm, preferably 12 mm to 40 mm, more preferably 15 mm to 35 mm, and even more preferably 15 mm to 30 mm. If it is shallower than 10 mm, the size of the food may be limited, and if it is deeper than 45 mm, it may be difficult to remove the food. The depth of the container body M refers to the vertical height from the surface of the bottom M1, which is the lowest part, to the upper end of the main body flange M3, which is the highest part.

[0030] <Details of Rib Section 1> Figures 3 and 4 show the portion that appears in the end view of the cross-section obtained by cutting the rib portion 1 perpendicularly along the dashed line VL1 shown in Figure 2(a). As shown in Figure 3(a), the rib portion 1 is a portion formed by creating a convex surface on the inside of the bottom M1 of the container body M and a concave surface on the outside of the bottom M1 of the container body M. However, it may also be a portion where only the surface of the bottom M1 is convex and the surface of the bottom M1 is flat. The rib portion 1 may be straight, L-shaped, V-shaped, U-shaped, square-shaped, or arc-shaped in plan view, and may be composed of a combination of two or more of these types. Each of the rib portions 1 may be the same length or of different lengths. The rib portions 1 may be arranged in parallel in a direction away from a predetermined point on the bottom M1. The height of the rib portion 1 is lower than the partition portion Mc and the main body side portion M2, but the highest rib portion 1 may be the same height as the partition portion Mc and the main body side portion M2.

[0031] The rib portion 1 only needs to be provided in a total of two around a predetermined point including the center point Mb of the bottom M1 of the housing portion Ma, regardless of whether or not there is a partition portion Mc, and may be formed on all or part of the housing compartment Md formed by the partition portion Mc. For example, the rib portion 1 may be provided in a total of two sets of two pieces each at opposing positions that straddle the predetermined point of the bottom M1, for a total of two (or two groups).

[0032] As shown in Figures 1, 2(a), and 3(a), each rib section 1 has a first rib section 11, a second rib section 12, and a third rib section 13 in that order, starting from the one closest to the center point Mb, and is formed to gradually become lower towards the center point Mb.

[0033] As shown in Figures 1, 2(a), and 3(a), this packaging container has at least two rib portions 1 provided around a predetermined point on the bottom M1 of the storage portion Ma, and the rib portions 1 are formed to gradually decrease in height toward the predetermined point. With this configuration, it is expected that the rib portions 1 will make it easier to gather food near the predetermined point, making it easier to serve, and the bottom M1 and the upper end of the rib portions 1 will be less likely to slip or roll, thus providing stability. Furthermore, it is preferable that the upper end portion of each individual piece of the rib portion 1 is formed in a sloping or stepped shape, gradually decreasing toward the predetermined point on the bottom M1. By forming the upper end portion of each individual piece in this way, it is possible to more reliably gather food near the predetermined point.

[0034] As shown in Figure 3(a), the first rib portion 11 includes a first rib top portion 11a, an inner first rib lower end portion 11b located inside the container body M which is also on the side of the center point Mb, an outer first rib lower end portion 11c located outside the container body M, an unnumbered inner first rib side portion located between the first rib top portion 11a and the inner first rib lower end portion 11b, and an unnumbered outer first rib side portion located between the first rib top portion 11a and the outer first rib lower end portion 11c.

[0035] As shown in Figure 3(a), the top of the first rib 11a is arc-shaped when viewed from the end face, but it may also be flat or semi-circular, with a larger radius of curvature at both ends than the flat shape. In the case of the flat or semi-circular shape, the planar portion may be inclined to become lower toward the inside of the container body M.

[0036] As shown in Figure 3(a), the lower end portion 11b of the inner first rib and the lower end portion 11c of the outer first rib are curved with a predetermined radius of curvature that is continuous with the bottom portion M1. The radius of curvature can be any of these, and the radii of curvature of the lower end portion 11b of the inner first rib and the lower end portion 11c of the outer first rib may be the same or different.

[0037] As shown in Figure 3(a), the second rib portion 12 and the third rib portion 13 have the same structure as the first rib portion 11. The second rib portion 12 has a second rib top portion 12a, an inner second rib lower end portion 12b, an outer second rib lower end portion 12c, an inner second rib side portion that is not numbered, and an outer second rib side portion that is not numbered. The third rib portion 13 has a third rib top portion 13a, an inner third rib lower end portion 13b, an outer third rib lower end portion 13c, an inner third rib side portion that is not numbered, and an outer third rib side portion that is not numbered.

[0038] As shown in Figure 3(a), the rib section 1 has three first rib sections 11, a second rib section 12, and a third rib section 13, which are provided at different distances from a predetermined point on the bottom M1, but there may be two or four or more. The first rib section 11, the second rib section 12, and the third rib section 13 are arranged in parallel in the direction away from the predetermined point on the bottom M1, and the further they are from the predetermined point, the further apart they are from each other. That is, the distance W1a between the top of the first rib section 11a and the top of the second rib section 12a, which corresponds to the distance between the first rib section 11 and the second rib section 12, is less than the distance W1b between the top of the second rib section 12a and the top of the third rib section 13, which corresponds to the distance between the second rib section 12 and the third rib section 13.

[0039] In this way, three or more rib sections 1 are provided at different distances from a predetermined point on the bottom M1. As the ribs are further apart the further they are from the predetermined point, even if the base of the rib section 1 is wider the further it is from the predetermined point due to molding considerations, the bottom M1 can be secured at the desired height between adjacent ribs. Therefore, it can be expected that food placed on the tops of the rib sections 1, such as the first rib top 11a, second rib top 12a, and third rib top 13a, will be less likely to come into contact with oil and juices from the food that have flowed down to the bottom M1.

[0040] The following explanation will use the case where the container body M is formed from non-foaming resin as an example. The distance W1a is 2 to 26 mm, and the distance W1b is 2 to 31 mm. If the distance W1a and / or distance W1b is shorter than 2 mm, it will be difficult to mold each of the rib sections 1 to the desired height, and if it is longer than 31 mm, it may be difficult to prevent food from rolling or sliding, and food may come into contact with oil or juice from the food.

[0041] The height of each rib is the vertical height from the surface of the bottom M1 to the top. The height H1a of the first rib 11 is 1 to 4 mm, the height H1b of the second rib 12 is 2 to 19 mm, and the height H1c of the third rib 13 is 3 to 20 mm. If the height H1a of the first rib 11 is lower than 1 mm, it may not be able to adequately prevent the placed food from rolling or sliding, and if the height H1c of the third rib 13 is higher than 20 mm, it may become difficult to secure space between the top of each rib and the lid, potentially reducing the total amount that can be stored.

[0042] As shown in Figure 3(a), the width of the top of each rib is the distance between the top of each rib and the boundary between both sides. The widths W2a of the first rib top 11a, W2b of the second rib top 12a, and W2c of the third rib top 13a are 1 to 6 mm, and may be the same or different. If they are narrower than 1 mm, they may be too sharp and easily pierce food, and if they are wider than 6 mm, it may be difficult to form the desired number of pieces. The widths of the tops located on the outside of the container body M may be wider, and the widths may increase in the order of W2a, W2b, and W2c.

[0043] As shown in Figure 3(a), the width W3a of the first rib portion 11, expressed as the distance between the innermost end of the lower end 11b of the inner first rib and the outermost end of the lower end 11c of the outer first rib, is 1.3 to 20 mm. The width W3b of the second rib portion 12, expressed as the distance between the innermost end of the lower end 12b of the inner second rib and the outermost end of the lower end 12c of the outer second rib, is 1.5 to 29 mm. The width W3c of the third rib portion 13, expressed as the distance between the innermost end of the lower end 13b of the inner third rib and the outermost end of the lower end 13c of the outer third rib, is 2 to 30 mm. These widths may be the same or different. Alternatively, the width may be as wide as the width of the top located on the outside of the container body M, and the widths may increase in the order of W2a, W2b, and W2c.

[0044] When the container body M is formed from foamed resin, the dimensions of the container body M, including the depth, distance W1a, distance W1b, height H1a of the first rib portion 11, height H1b of the second rib portion, height H1c of the third rib portion, width W2a of the top of the first rib 11a, width W2b of the top of the second rib 12a, width W2c of the top of the third rib 13a, width W3a of the first rib portion 11 (expressed as the distance between the innermost end of the lower end 11b of the inner first rib and the outermost end of the lower end 11c of the outer first rib), width W3b of the second rib portion 12 (expressed as the distance between the innermost end of the lower end 12b of the inner second rib and the outermost end of the lower end 12c of the outer second rib), and width W3c of the third rib portion 13 (expressed as the distance between the innermost end of the lower end 13b of the inner third rib and the outermost end of the lower end 13c of the outer third rib), are appropriately set to obtain the effects and benefits of the present invention, taking into account the foaming ratio and basis weight of the resin.

[0045] As shown in Figure 3(b), the first rib apex 11a, the second rib apex 12a, and the third rib apex 13a are located on the circumference of the same circle or ellipse that traces a trajectory perpendicular to the rib section 1, represented by the imaginary line VL2. In this case, unlike the height difference H2a between the first rib apex 11a and the second rib apex 12a, and the height difference H2b between the second rib apex 12a and the third rib apex 13a shown in Figure 3(a), the differences in both the height difference H3a between the first rib apex 11a and the second rib apex 12a, and the height difference H3b between the second rib apex 12a and the third rib apex 13a, shown in Figure 3(b), become larger. The radius of curvature of the circle or ellipse represented by the imaginary line VL2 is not limited as long as the apex of the rib section 1 is located on the circumference of the circle or ellipse.

[0046] With this configuration, the difference in height between adjacent ribs increases as you move away from the predetermined point. This makes it easier to prevent food from sliding or rolling away from the predetermined point, and is expected to make it easier to contain food without it scattering far away from the predetermined point.

[0047] As shown in Figure 4(a), the lower end 11c of the outer first rib may be gentler than the lower end 11b of the inner first rib, the lower end 12c of the outer second rib may be gentler than the lower end 12b of the inner second rib, and the lower end 13c of the outer third rib may be gentler than the lower end 13b of the inner third rib. With this configuration, oil and juice from food that flows down the lower ends 11c of the outer first rib, 12c of the outer second rib, and 13c of the outer third rib tend to concentrate further away from the contained food, thus reducing contact between the oil and juice and the food, which can be expected to result in more stable storage of the food.

[0048] As shown in Figure 4(b), the lower end 11b of the inner first rib may be gentler than the lower end 11c of the outer first rib, the lower end 12b of the inner second rib may be gentler than the lower end 12c of the outer second rib, and the lower end 13b of the inner third rib may be gentler than the lower end 13c of the outer third rib. With this configuration, the tips of spoons, forks, and chopsticks placed in the storage section Ma are guided to the lower end 11b of the inner first rib, the lower end 12b of the inner second rib, and the lower end 13b of the inner third rib, respectively, so it is expected that it will be easier to scoop up or pick up food that has been gathered near a predetermined point.

[0049] As shown in Figure 2(a), the rib portion 1 is located on the circumference of the same circle or ellipse centered at a predetermined point including the center point Mb of the bottom portion M1. For example, each of the first rib portions 11 located within the storage compartment Md is located on the circumference of the same circle indicated by the dashed line VL3 centered at the center point Mb. With this configuration, since multiple rib portions 1 can be arranged at equidistant distances from the predetermined point, it is expected that food will be more likely to accumulate near the predetermined point. The rib portion 1 may be formed to be located completely on the circumference of the same circle indicated by the dashed line VL3 (not shown), or it may be formed to be located partially inside (closer to the center point Mb) and partially outside (away from the center point Mb) of the circle indicated by the dashed line VL3, so as a whole it is located on the circumference (Figure 2(a)).

[0050] The rib portion 1 may have corners that are bent laterally. For example, as shown in Figures 1 and 2(a), the first rib portion 11 in the rib portion 1 within a predetermined storage compartment Md has a first rib corner 11d, the second rib portion 12 has a second rib corner 12d, and the third rib portion 13 has a third rib corner 13d, forming a roughly L-shape in plan view. Each of the aforementioned corners is roughly a right angle, but it may be an acute angle less than 90° or an obtuse angle greater than 90°. With this configuration, food is more likely to hit or get caught on the corners of the rib portion 1, which helps to stabilize the position of the food and makes it easier to gather food near a predetermined point on the bottom M1.

[0051] <Overview of Lid N> As shown in Figures 1, 2, and 5, the lid N comprises a top surface portion N1, a lid side portion N2 formed downward from the peripheral edge of the top surface portion N1, a lid flange portion N3 formed outward from the lowest end of the lid side portion N2, and an unnumbered lid fitting portion formed downward from the outermost end of the lid flange portion N3.

[0052] The lid N may be the same as or different from the container body M in plan view, as long as it can be attached to the container body M. The shape and area of ​​the top surface N1, the vertical height and inclination angle of the lid side N2, the shape and width of the lid flange N3 from the innermost to the outermost end, and the shape and height of the lid fitting portion are not limited. The lid side N2 is flat, but may also be curved.

[0053] <Details of side part N2 of the lid> Figure 6 shows the end of a cross-section obtained by cutting the lid N perpendicular to its longitudinal or transverse direction. As shown in Figure 6, the lid side portion N2 has a lid side portion N2a that is continuous with the top portion N1, and a lid side bulge portion N2b that is continuous with the lower end of the lid side portion N2a and bulges outward from the lid side portion N2a. With this configuration, it is possible to expect that food will be more easily pushed into the container body M by the lid side bulge portion N2b when the lid is closed, thereby reducing the likelihood of food being pinched between the lid N and the container body M.

[0054] The lid-side bulge N2b only needs to bulge outward from the lid side portion N2a, but it is preferable that the radius of curvature be 5 to 20 mm and that it bulges 0.5 to 5 mm from the plane of the lid side portion Na2 (more specifically, that the inner surface of the lid-side bulge Nb2 facing the containment portion Ma bulges 0.5 to 5 mm from the inner surface of the lid side portion Na2 facing the containment portion Ma). If the radius of curvature is less than 5 mm or greater than 20 mm, or if the amount of bulge from the plane of the lid side portion Na2 is less than 0.5 mm or greater than 5 mm, the above-mentioned effects are unlikely to be achieved. The lid-side bulge N2b may be provided along the entire circumferential direction of the lid side portion N2, or it may be provided intermittently at predetermined intervals. If the planar shape of the container body M is a polygon rather than a circle or ellipse, the lid-side bulge N2b may be provided on any of the surfaces or on two or more surfaces.

[0055] <Specifications of the synthetic resin sheet material, forming method, dimensions, etc. for the container body M and lid N> The synthetic resin sheet may be made of polystyrene-based resin, such as polystyrene paper (PSP) or filler-filled polypropylene (PPF), or polyester-based resin such as polyethylene terephthalate, or olefin-based resin such as polyethylene or polypropylene. It may consist of a single layer or multiple layers, and may be colored, colorless and transparent, or opaque. It may also be made of a heat-resistant material. The synthetic resin sheet is used to form the container body M by thermoforming, such as by vacuum forming, hot plate pressure forming, vacuum pressure forming, or double-sided vacuum forming. The surface and / or back surface of the synthetic resin sheet may be covered with a synthetic resin film. The synthetic resin film may consist of a single layer or multiple layers having heat resistance, oil resistance, lamination compatibility with printed layers, gas barrier properties, etc. If the surface of the synthetic resin sheet is covered, it may include a printed layer.

[0056] In other words, the synthetic resin sheet may be made of foamed resin or non-foamed resin. There are no particular restrictions on the thickness of the synthetic resin sheet, but for low-foaming resins with a foaming ratio of 1.5 to 3 times, it should be 0.5 to 3 mm, preferably 1 to 2 mm; for high-foaming resins with a foaming ratio of 5 to 15 times, it should be 1.5 to 5 mm, preferably 2 to 4 mm, more preferably 2.5 to 3.5 mm; and for non-foaming resins, it should be 0.2 to 1.0 mm, preferably 0.23 to 0.65 mm, and even more preferably 0.23 to 0.45 mm. The foaming ratio is calculated by measuring the specific volume (unit: cc / g) of the material before foaming (foaming composition) and the material after foaming (foaming sheet), and dividing the specific volume after foaming by the specific volume before foaming.

[0057] <Specifications of the synthetic resin film used for the container body M and lid N, including material, forming method, dimensions, etc.> The synthetic resin film may be laminated in the following order from the side furthest from the substrate: for example, a polypropylene resin layer, a printed layer, a dry lamination adhesive layer, a gas barrier layer, a dry lamination adhesive layer, and a polystyrene resin layer. Alternatively, the printed layer may be omitted, or it may be laminated with an adhesive layer other than the dry lamination adhesive layer, or a polypropylene resin layer, a gas barrier layer, and a polypropylene resin layer may be laminated in this order. In the container body M and lid N shown in Figure 1, the substrate is on the outside and the synthetic resin film is on the inside (food contact side).

[0058] Furthermore, 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]

[0059] Container body M, storage section Ma, center point Mb, partition Mc, storage compartment Md, bottom M1, body side M2, body flange M3 Cover N, top surface N1, side of cover N2, side of cover N2a, bulging part on the side of cover N2b, flange part of cover N3 Rib section 1, first rib section 11, second rib section 12, third rib section 13, First rib top 11a, inner first rib lower end 11b, outer first rib lower end 11c, first rib corner 11d Second rib top 12a, inner second rib lower end 12b, outer second rib lower end 12c, second rib corner 12d Third rib top 13a, inner third rib lower end 13b, outer third rib lower end 13c, third rib corner 13d

Claims

1. It has at least two rib portions provided around a predetermined point at the bottom of the storage section, The rib portion is formed to gradually decrease in height toward the predetermined point. Packaging containers.

2. The rib portions are provided in groups of three or more, each at a different distance from the predetermined point, and are further apart from each other the further away they are from the predetermined point. The packaging container according to claim 1.

3. The rib portion is provided in three or more locations, each at a different distance from the predetermined point. The top of the rib portion is located on the circumference of the same circle or ellipse that traces a trajectory in the vertical direction. The packaging container according to claim 1.

4. The rib portion has an inner rib lower end that is provided on the side closer to the predetermined point relative to the top of the rib portion and continuous with the bottom, and an outer rib lower end that is provided on the side further from the predetermined point relative to the top and continuous with the bottom, The lower end of the outer rib is smoother than the lower end of the inner rib when viewed from a vertical end face. The packaging container according to claim 1.

5. The rib portion has an inner rib lower end that is provided on the side closer to the predetermined point relative to the top of the rib portion and continuous with the bottom, and an outer rib lower end that is provided on the side further from the predetermined point relative to the top and continuous with the bottom, The lower end of the inner rib is smoother than the lower end of the outer rib when viewed from a vertical end face. The packaging container according to claim 1.

6. The rib portion is located on the circumference of the same circle or ellipse centered on the predetermined point. A packaging container according to any one of claims 1 to 5.

7. The rib portion has a corner that is bent in the lateral direction. A packaging container according to any one of claims 1 to 5.

8. The container body includes the aforementioned storage section and is equipped with a lid that is attached to the container body, The cover has a cover side portion provided downward from the peripheral edge of the top surface and a flange portion provided outward from the lower end of the cover side portion. The side portion of the lid has a lid side portion that is continuous with the top portion and a lid side bulge portion that is continuous with the lower end of the lid side portion and bulges outward from the lid side portion. A packaging container according to any one of claims 1 to 5.

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