Packaging container

Abstract

To provide a packaging container whose leg parts are unlikely to fall off between rollers of a conveyor during transfer.SOLUTION: A packaging container includes: a first leg part 2a and a second leg part 2b adjacent to the first leg part 2a that protrude downward from a bottom surface part on which a content is placed; a gap part 4 between a first leg end part 21a which is an end part of the first leg and a second leg end part 21b which is an end part of the second leg part; and a first gradually changing part 22a formed on the first leg end part 21a adjacent to the gap part 4 and gradually separated from the second leg part 2b and a second gradually changing part 22b formed on the second leg end part 21b and gradually separated from the first leg part 2a, wherein a distance L1 between a first gradually changing lower end part 24a which is a lower end of the first gradually changing part and a second gradually changing lower end part 24b which is a lower end of the second gradually changing part on a projection plane from a front direction of one of the first gradually changing part 22a and the second gradually changing part 22b is 10 to 30 mm.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a packaging container having a container body that is transported by a conveyor in, for example, a food packaging process. [Background technology]

[0002] Conventionally, foods such as boxed lunches and side dishes sold at supermarkets and convenience stores have been packaged in packaging containers and transported by belt- or roller-type conveyors through a food packaging process before being shipped to each store. However, there are many different types of packaging containers, and while factors such as the type of food to be packaged, the functionality suitable for display at each store, and the consumer's usage scenario have been taken into consideration, the food packaging process has not always been taken into consideration.

[0003] For example, Patent Document 1 discloses a packaging container in which, when packaging containers are stacked on top of one another, the first leg of the container body stacked on top abuts against the side wall of the lid body underneath, preventing inadvertent shifting and allowing for stable stacking; and further, since the second leg of the container body abuts against the top plate of the lid body, the first leg of the container body does not overlap deeply into the side wall of the lid body, and visibility of the lid body is not impaired (see paragraphs "0008" and "0010"). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-131238 A Summary of the Invention [Problem to be solved by the invention]

[0005] As in Patent Document 1, if the container body has a structure without legs at the corners on the back side, the corners of the lower lid fit into the corners on the back side of the container body, which is expected to make it easier to stack packaging containers. However, depending on the shape of the legs, the dimensions of each part of the legs, and the positional relationship between the legs on the longitudinal side and the legs on the lateral side and the distance between them, it may not be suitable for food conveying processes. For example, as shown in Figures 7(A) to (C), if the distance on the projection plane between the lower end of the legs on the longitudinal side and the lower end of the legs on the lateral side is too large, the legs on the traveling direction side may fall off between the rollers of the conveyor during conveyance on the conveyor.

[0006] Therefore, a first object of the present invention is to provide a packaging container whose legs are unlikely to fall off between the rollers of a conveyor during transportation. A second object of the present invention is to provide a packaging container whose legs make it easy to stack. [Means for solving the problem]

[0007] That is, the packaging container of the present invention includes a first leg protruding downward from a bottom surface portion on which the contents are placed, a second leg adjacent to the first leg, a gap portion sandwiched between an end of the first leg and an end of the second leg, a first gradually changing portion formed at an end of the first leg adjacent to the gap portion and gradually moving away from the second leg, and a second gradually changing portion formed at an end of the second leg and gradually moving away from the first leg, and the distance between the lower end of the first gradually changing portion and the lower end of the second gradually changing portion on a projection plane from a front direction of one of the first gradually changing portion or the second gradually changing portion is 10 to 30 mm. According to this configuration, for example, in a process of packaging the contents, the first gradually changing portion contacts the conveyor before the second leg falls between the rollers of the conveyor that transports the packaging container, so that it is possible to expect an effect of suppressing a decrease in the propulsive force of the packaging container by the conveyor and preventing the second leg from falling between the rollers.

[0008] It is desirable that one of the first leg and the second leg is parallel to the transport direction during production, and the other is perpendicular to the transport direction during production. "During production" refers not only to the process of packaging the contents, but also to the process of producing the packaging container. This configuration is expected to have the effect of making it easier to design a structure suitable for preventing the contents from falling between the rollers based on the first leg or the second leg.

[0009] The distance is desirably shorter than the center distance of each roller of the conveyor that moves in the transfer direction. With this configuration, it is expected that a structure suitable for preventing the item from falling off between the rollers can be easily designed based on the center distance of each roller.

[0010] The gap preferably corresponds to a corner of the bottom surface. This configuration is expected to have the effect of making it easier to adopt a structure suitable for preventing stackable packaging containers from falling between the rollers.

[0011] Another packaging container according to the present invention is characterized in that it comprises a container body as the above-mentioned packaging container, and a lid body having a cover part that is circumferentially surrounded by the first leg part and the second leg part when the container bodies are stacked. With this configuration, it is expected that it will be easier to adopt a structure suitable for preventing stackable packaging containers from falling between the rollers.

[0012] Here, in the present invention, "molding" means simply shaping or being shaped without limiting the manufacturing method, and "molding" means shaping or being shaped by fitting into a specific mold. In other words, "molding" is an expression that includes "molding", and "external fitting" or "lateral external fitting" refers to a structure in which the fitting portion of the fitting side (e.g., the container body) is located on the outside, and the fitting portion of the mated side (e.g., the lid) is located on the inside, and "internal fitting" refers to a structure in which the fitting portion of the fitting side is located on the inside, and the fitting portion of the mated side is located on the outside. Effect of the Invention

[0013] According to the present invention, the legs are less likely to fall off between the rollers of the conveyor during transportation, and the legs are expected to make stacking easier. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view of a lid (top) and a container body (bottom) of a packaging container in one embodiment of the present invention. [Diagram 2] 2A and 2B are bottom perspective views of the container body of FIG. 1. [Diagram 3] 2A is a front view of the container body of FIG. 1, and FIG. 2B is a partially enlarged view of the front view. [Figure 4] 2A is a right side view of the container body in FIG. 1, and FIG. 2B is a partially enlarged view of the right side view. [Diagram 5] 2A and 2B are a plan view and a bottom view of the container body of FIG. 1. [Figure 6] FIG. 2 is a conceptual diagram showing an example of a food packaging process using a packaging container according to one embodiment of the present invention. [Figure 7] FIG. 1 is a conceptual diagram showing an example of a food packaging process using a conventional packaging container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a packaging container according to one embodiment of the present invention will be described with reference to Figs. 1 to 6. In these figures, when there are a plurality of identical parts, only one part is numbered. For convenience of explanation, certain parts and leading lines are shown with hidden lines (broken lines) or imaginary lines (two-dot chain lines). In the explanation, terms indicating directions such as upward, downward, lateral, vertical, horizontal, inward, outward, central, and circumferential directions are basically based on the packaging container installed in the normal orientation, and when other directions are used as the basis, they will be explained appropriately. Plan view means that the packaging container is viewed from directly above.

[0016] <Basic composition of this packaging container> As shown in Figure 1, this packaging container is used to package food such as prepared dishes, bento lunches, sushi, sashimi, and salads to be sold in supermarkets and other retail stores, and is equipped with a container body T that contains the food, and a lid body C that is attached to the container body T. This packaging container is rectangular in plan view, but it can also be square or have a shape with pentagons or more, and there are no limitations on dimensions such as length, width, and height as long as it is large enough to be placed on a display shelf in a retail store.

[0017] <Overview of container body T> 1 and 2, the container body T comprises a bottom surface portion 1 on which food is placed, legs 2 continuously protruding downward from the peripheral edge of the bottom surface portion 1, and a body flange portion 3 continuously extending outward from the upper edge of the legs 2. The container body T is rectangular in plan view, but may have any shape as long as the lid body C can be attached. The lengths of the longitudinal and lateral sides of the container body T may be 80 to 450 mm, and more preferably 100 to 300 mm.

[0018] <Details of bottom part 1> 1 and 2, bottom portion 1 is located at a position equivalent to the height of leg portion 2 and lower than main body flange portion 3, but it may be located at a higher position. Leg portions 2 form grooves with a depth equivalent to the height of leg portion 2 outside the peripheral edge of bottom portion 1, but no such grooves are formed at the corners of bottom portion 1. Bottom portion 1 is rectangular in plan view, but may be square or pentagonal or greater, circular or elliptical.

[0019] <Leg 2 details> The leg 2 has a function and purpose of increasing the height of the bottom portion 1 to improve the appearance of the food contents. As shown in FIG. 2, the leg 2 has a first leg 2a formed on the longitudinal side of the bottom portion 1 along the outer peripheral shape of the bottom portion 1, and a second leg 2b formed on the lateral side of the bottom portion 1 and adjacent to the first leg 2a in a direction perpendicular to the first leg 2a. The leg 2 is not formed on the back side of the corner of the bottom portion 1, in other words, the first leg 2a and the second leg 2b are formed at adjacent positions with a gap 4 between them corresponding to the back side of the corner of the bottom portion 1. The leg 2 is wall-shaped when viewed from the front in the longitudinal direction of the leg 2, and is approximately V-shaped when cut from the lateral direction of the leg 2, but may be approximately U-shaped.

[0020] As shown in FIG. 3(B), the height H of the leg 2 is 8 to 24 mm, more preferably 10 to 20 mm, and even more preferably 11 to 17 mm. The height H corresponds to the height from the lowermost end in contact with the mounting surface to the surface of the bottom portion 1. The angle D1 of the wall portion of the leg 2 forming the above-mentioned cut surface is 50 to 80°, more preferably 55 to 75°, and even more preferably 60 to 70°. The width W of the bottom portion of the leg 2 is 3 to 15 mm, preferably 5 to 12 mm, more preferably 6 to 10 mm, and even more preferably 7 to 9 mm. The bottom portion may be only the flat portion facing the mounting surface, or may be the flat portion and the chamfered portion corresponding to the boundary between each of the end portions of the flat portion and the wall portion formed continuously therewith.

[0021] <Details of the first leg 2a and the second leg 2b> As shown in Fig. 2, the first leg 2a has a first leg end 21a which corresponds to the end of the first leg 2a in the longitudinal direction. The second leg 2b has a second leg end 21b which corresponds to the end of the second leg 2b in the longitudinal direction. The first leg end 21a and the second leg end 21b sandwich the gap 4, in other words, the first leg end 21a and the second leg end 21b are disposed at a position where the gap 4 is generated. The first leg 2a has a length substantially equal to the length of the bottom surface 1 in the longitudinal direction, and the second leg 2b has a length substantially equal to the length of the bottom surface 1 in the lateral direction.

[0022] <Details of First Leg End 21a and Second Leg End 21b> The specifications of the first leg end 21a and the second leg end 21b are the same, but may be different. In detail, as shown in FIG. 2, the first leg end 21a has a first gradually changing portion 22a that is obliquely cut out when viewed from the front in a direction perpendicular to the longitudinal direction of the first leg 2a. The first leg end 21a and the first gradually changing portion 22a are formed at both ends of the longitudinal direction of the first leg 2a. The second leg end 21b has a second gradually changing portion 22b that is obliquely cut out when viewed from the front in a direction perpendicular to the longitudinal direction of the second leg 2b. The second leg end 21b and the second gradually changing portion 22b are formed at both ends of the longitudinal direction of the second leg 2b.

[0023] <Details of the first gradual change portion 22a and the second gradual change portion 22b> The specifications of the first gradually changing portion 22a and the second gradually changing portion 22b are the same, but may be different. In detail, as shown in Fig. 3, the first gradually changing portion 22a is gently inclined from the first gradually changing upper end 23a located at the outermost end in the longitudinal direction of the first leg portion 2a to the first gradually changing lower end 24a located in the central direction of the longitudinal direction and in contact with the placement surface, and may be inclined stepwise at different inclination angles with respect to the horizontal plane. As shown in Fig. 4, the second gradually changing portion 22b is gently inclined from the second gradually changing upper end 23b located at the outermost end in the longitudinal direction of the second leg portion 2b to the second gradually changing lower end 24b located in the central direction of the longitudinal direction and in contact with the placement surface, and may be inclined stepwise at different inclination angles with respect to the horizontal plane.

[0024] As shown in FIG. 3, the angle D2 of the inclined portion of the first gradually changing portion 22a starting from the first gradually changing lower end portion 24a with respect to the horizontal plane is 15 to 45°, preferably 20 to 40°, and more preferably 25 to 35°. If the angle D2 is 15 to 45°, even if the second leg portion 2b is about to fall off between the rollers and the entire packaging container is tilted, the first gradually changing portion 22a contacts the rollers, suppressing a decrease in the propulsion force of the packaging container by the conveyor, and thus the possibility of preventing the second leg portion 2b from falling off can be expected to increase. On the other hand, if the angle D2 is gentler than 15°, when stacking the packaging containers, the corners corresponding to the four corners of the top surface portion C1a of the cover portion C1 of the lid body C shown in FIG. 1 located on the lower side are likely to interfere with the first gradually changing portion 22a, which may cause stacking difficulties. Furthermore, if angle D2 is steeper than 45°, even if second leg 2b is about to fall off between the rollers and the entire packaging container tilts, first gradually changing portion 22a does not contact the rollers and the decrease in the propulsion force of the packaging container by the conveyor cannot be suppressed, so that it may be difficult to prevent second leg 2b from falling off. As shown in Fig. 4, angle D3 of the inclined portion of second gradually changing portion 22b starting from second gradually changing lower end portion 24b with respect to the horizontal plane is the same as angle D2 shown in Fig. 3, but may be different.

[0025] <Relationship between first leg portion 2a, second leg portion 2b, and gap portion 4> 3, when viewed from the front in the longitudinal direction of the container body T, the first leg 2a is located on the left side, and the gap 4 and the second leg 2b are located on the right side, and if this is taken as the front direction, the distance L1 between the first gradually changing lower end 24a and the second gradually changing lower end 24b on the projection plane from this front direction is 10 to 30 mm, preferably 12 to 24 mm, and more preferably 14 to 22 mm. If the distance L1 is 10 to 30 mm, even if the second leg 2b is about to fall off between the rollers and the entire packaging container is tilted, the first gradually changing portion 22a comes into contact with the rollers, thereby suppressing a decrease in the propulsive force of the packaging container by the conveyor, and it is expected to have an effect of increasing the possibility that the second leg 2b will not fall off. On the other hand, if the distance L1 is shorter than 10 mm, the corners of the top surface C1a of the cover C1 of the lid C shown in FIG. 1 located on the lower side may interfere with the first gradually changing portion 22a when stacking the packaging containers, which may cause stacking problems. If the distance L1 is longer than 30 mm, even if the second leg 2b is about to fall off between the rollers and the entire packaging container tilts, the first gradually changing portion 22a does not contact the rollers and the decrease in the propulsion force of the packaging container by the conveyor cannot be suppressed, so that it may be difficult to prevent the second leg 2b from falling off. In the above front view, the first gradually changing upper end 23a is located in a position that appears to overlap with the second leg 2b, and more specifically, it is located near the line that vertically bisects the second leg 2b, which makes it easier to set the first gradually changing portion 22a to a desired angle and / or makes it easier to set the distance L1 to a desired range.

[0026] As shown in Fig. 4, when viewed from the front in the short-side direction of the container body T, the second leg 2b is located on the right side, and the gap 4 and the first leg 2a are located on the left side, and if this is taken as the front direction, the distance L2 between the first gradually changing lower end 24a and the second gradually changing lower end 24b on the projection plane from this front direction is equal to L1 shown in Fig. 3, but may be different. Fig. 3(B) and Fig. 4(B) are symmetrical, but may be asymmetrical.

[0027] 1 and 5, when stacking the present packaging containers, the first leg 2a and the second leg 2b also have the function and purpose of surrounding the long edges and short edges, respectively, of the top surface C1a of the cover C1 of the lower lid C, and the gap 4 has the function and purpose of accommodating the four corners of the top surface C1a. In other words, the upper packaging container is stacked without being misaligned with the lower lid C due to the first leg 2a and the second leg 2b of the container body T provided therewith, and the gap 4.

[0028] As shown in Figure 2, of the first leg end 21a, another unnumbered sloping portion that is also continuous with the first gradual change portion 22a faces the gap portion 4, and of the second leg end 21b, another unnumbered sloping portion that is also continuous with the second gradual change portion 22b faces the gap portion 4, and each of the above sloping portions forms the gap portion 4 in a V-shape, making it easier for the top surface portion C1a of the cover portion C1 of the lower lid body C to fit in.

[0029] <Outline of transportation of food packaging containers> As shown in FIG. 6, the packaging container is transported by a belt conveyor R with the food contained in the container body T. The transport direction is from left to right. The belt conveyor R includes a first conveyor R1 having rollers R1a at least at both ends for rotating the transport sheet, and a second conveyor R2 having the same specifications as the first conveyor R1 and rollers R2a at least at both ends for rotating the transport sheet. The first conveyor R1 and the second conveyor R2 are arranged adjacent to each other, with one roller R1a and the other roller R2a. The center distance RL between the rollers R1a and R2a is 25 to 40 mm, and more preferably 30 to 35 mm. The belt conveyor R may include not only the first conveyor R1 and the second conveyor R2, but also conveyors having the same specifications as these. The first conveyor R1 and the second conveyor R2 may be composed of multiple rollers instead of a transport sheet, and in this case, the center distance between the adjacent rollers is equal to the center distance RL described above.

[0030] <Specifications of this packaging container and its relationship to transportation> As shown in Fig. 6, the first leg 2a is parallel to the above-mentioned conveying direction, and the second leg 2b is perpendicular to the above-mentioned conveying direction. The distance L1 shown in Fig. 3(B) is narrower than the center-to-center distance RL, but may be the same, and the ratio of the distance L1 to the center-to-center distance RL is 1:2 to 1:1. The distance L1 / center-to-center distance RL (distance L1÷center-to-center distance RL) may be 0.25 to 0.7, or may be 0.5 to 0.66.

[0031] <Details of the transportation status of this packaging container> FIG. 6 shows the state of transportation of this packaging container in which the ratio of the distance L1 to the center distance RL is 1:2. As shown in FIG. 6(A), when the container body T transfers from the first conveyor R1 to the second conveyor R2, it tries to cross the gap between rollers R1a and R2a. However, as shown in FIG. 6(B), when the front second leg 2b tries to pass through the gap, as the center of gravity of the container body T approaches the gap, the container body T tilts toward the gap, and the second leg 2b is likely to fall into the gap. At this time, the first gradually changing portion 22a of the first leg 2a approaches the roller R1a, so the inclination angle of the first gradually changing portion 22a with respect to the roller R1a becomes smaller. That is, when the unnumbered first leg bottom portion corresponding to the rear of the first gradually changing lower end portion 24a of the first leg portion 2a moves away from the transfer sheet and roller R1a of the first conveyor R1, the first gradually changing portion 22a corresponding to the front of the first gradually changing lower end portion 24a moves closer to the roller R1a, and the contact between the first leg portion 2a and the first conveyor R1 is compensated. This can be expected to suppress the decrease in the propulsive force of the container body T by the first conveyor R1 and prevent the second leg portion 2b from falling off into the valley. Therefore, as shown in FIG. 6(C), the second leg portion 2b crosses the valley and reaches the roller R2a of the second conveyor R2.

[0032] <Overview of Lid C> As shown in FIG. 1, the lid C includes a cover C1 having a top surface C1a and a lid side wall C1b formed so as to expand downward from the peripheral edge of the top surface C1a, a circumferential groove C2 formed continuously outward from the lower edge of the cover C1, and a lid flange C3 formed so as to extend continuously outward from the outer edge of the circumferential groove C2. The cover C1 may be flat without the lid side wall C1b, and may be higher or lower than the lid flange 3. The lid C may not include the circumferential groove C2, and may include the cover C1 and the lid flange C3 continuing outward from the lower edge of the cover C1. The cover C1 is rectangular in plan view, but may be square or rectangular with pentagons or more, or may be circular or elliptical.

[0033] <Details of the top surface C1a> As shown in Fig. 1, the top surface C1a is rectangular in plan view, but may be square or pentagonal. The peripheral edge of the top surface C1a is straight, and the straight lines intersect to form corners at the four corners. The corners corresponding to the boundaries between the top surface C1a and the lid side wall C1b are slightly rounded, in other words, are hardly rounded, but may be rounded to a predetermined dimension, and the radius of curvature of the rounded shape is 2.0 mm or less, preferably 1.5 mm or less.

[0034] <Details of the lid side wall C1b> As shown in FIG. 1, the cover side wall C1b is formed of four flat surfaces (hereinafter also referred to as "cover side wall flat surfaces"). Cover side wall corners C1c, which correspond to the boundaries between the cover side wall flat surfaces, are formed at the four corners. The cover side wall corners C1c are formed so that the amount of protrusion increases from the cover side wall flat surface toward the lower end from the upper end of the top surface C1a side, but they may be formed in a very slight R shape without increasing the amount of protrusion. The ends of the cover side wall flat surface corresponding to both sides of the cover side wall corners C1c are curved surfaces that diverge from the upper end to the lower end of the top surface C1a side, but the radius of curvature of the curved surfaces is not limited, and they may be simply flat surfaces instead of curved surfaces. The radius of curvature of the cover side wall corners C1c is 2.0 mm or less, and preferably 1.5 mm or less. Based on common knowledge in the technical field of the present invention, the lid side wall corner C1c has a sharp shape and acts as a resistance against the twisting movement of the lid C, making it difficult for the lid C to twist. In other words, the lid side wall corner C1c exerts a function of making it difficult for the lid C to be removed from the container body T.

[0035] <Specifications of container body T, including material, forming method, dimensions, etc.> The container body T is molded using a synthetic resin sheet as a base material. The synthetic resin sheet may be made of, for example, an olefin resin such as polyethylene (PE) or polypropylene (PP), polystyrene paper (PSP) made of a polystyrene resin, high impact polystyrene (HIPS) in which an elastic material such as a butadiene copolymer is blended with GP polystyrene to improve impact resistance, or a polyester resin such as polyethylene terephthalate (PET), and may be composed of a single layer or multiple layers, may be colored or colorless transparent, or may be opaque, and may be formed of a material having heat resistance. The synthetic resin sheet is formed into a desired shape of the container body by a thermoforming method such as vacuum molding, hot plate pressure molding, vacuum pressure molding, double-sided vacuum molding, etc. The front and / or back of the synthetic resin sheet may be laminated with a synthetic resin film. The synthetic resin film may be composed of a single layer or multiple layers having heat resistance, oil resistance, lamination suitability with a printed layer, gas barrier property, etc., and may include a printed layer when the surface of the synthetic resin sheet is laminated.

[0036] The synthetic resin sheet may be made of foamed resin or non-foamed resin. There is no particular limit to the thickness of the synthetic resin sheet, but in the case of non-foamed resin, the thickness is 0.15 to 1 mm, preferably 0.16 to 0.8 mm, and more preferably 0.18 to 0.6 mm. In the case of low-foamed resin with an expansion ratio of 1.5 to 3 times, the thickness is 0.5 to 3 mm, and preferably 1 to 2 mm. In the case of high-foamed resin with an expansion ratio of 5 to 15 times, the thickness is 1.5 to 5 mm, preferably 1.8 to 4 mm, and more preferably 2.0 to 3.5 mm. The expansion ratio is calculated by measuring the specific volume (unit: cc / g) of the foamed composition before expansion and the foamed sheet after expansion, and calculating the specific volume after expansion / specific volume before expansion.

[0037] For foamed resin, the basis weight (mass per unit area) is 120 to 220 g / m 2 However, as the material becomes heavier, the amount of resin increases, which is preferable because it is relatively easier to obtain the desired strength, but the material cost increases accordingly, so it is necessary to select a material weight that takes into account this balance. The preferred weight is 130 to 220 g / m 2 , and more preferably 140 to 200 g / m 2 , more preferably 150 to 200 g / m 2 It is.

[0038] <Specifications for the material, forming method, dimensions, etc. of the cover C> The cover C is molded using a synthetic resin sheet as a base material. The synthetic resin sheet may be made of, for example, a polyester resin such as polyethylene terephthalate (PET), an olefin resin such as polyethylene (PE) or polypropylene (PP), or a polystyrene resin such as biaxially oriented polystyrene (OPS; Oriented Polystyrene), and may be composed of a single layer or multiple layers, may be colored or colorless transparent, or may be opaque, and may be formed of a material having heat resistance. The synthetic resin sheet is formed into a desired shape by a thermoforming method such as vacuum molding, hot plate pressure molding, vacuum pressure molding, double-sided vacuum molding, etc. The front and / or back surface of the synthetic resin sheet may be laminated with a synthetic resin film. The synthetic resin film may be composed of a single layer or multiple layers having heat resistance, oil resistance, lamination suitability with a printed layer, gas barrier property, etc., and may include a printed layer when the surface of the synthetic resin sheet is laminated. For example, by adopting a synthetic resin sheet made of biaxially oriented polystyrene and hot plate pressure molding, it is easy to mold the cover C as designed.

[0039] The synthetic resin sheet may be made of foamed resin or non-foamed resin. There is no particular limit to the thickness of the synthetic resin sheet, but in the case of non-foamed resin, it may be 0.15 to 1 mm, preferably 0.16 to 0.75 mm, and more preferably 0.18 to 0.5 mm. If it is thinner than 0.15 mm, it may be too thin and may break easily during or after molding, and if it is thicker than 1 mm, it may be too thick and the heating time or cooling time may be long. In the case of low-foamed resin with an expansion ratio of 1.5 to 3 times, it may be 0.5 to 3 mm, preferably 1 to 2 mm. In the case of high-foamed resin with an expansion ratio of 5 to 15 times, it may be 1.5 to 5 mm, preferably 1.8 to 4 mm, and more preferably 2.0 to 3.5 mm. The expansion ratio is calculated by measuring the specific volume (unit: cc / g) of the one before foaming (foamable composition) and the one after foaming (foamed sheet) and calculating the specific volume after foaming / specific volume before foaming.

[0040] <Relationship between the specifications for the material of the container body T and the specifications for the material of the lid body C> If the lid C is made of a non-foamed resin such as polyethylene terephthalate (PET), which tends to become thin, and the corners corresponding to the boundary between the top surface C1a and the lid side wall C1b have a very slight R-shape, and the corners formed by two adjacent surfaces of the lid side wall corners C1c near the top surface C1a have a very slight R-shape, so that the corners formed by the top surface C1a and the above-mentioned two surfaces, which correspond to the four corners of the upper part of the cover part C1, are sharply pointed, it is preferable to adopt the specifications of the first gradual change portion 22a described above in order to make the container body T made of a foamed resin such as polystyrene paper (PSP), which tends to become thick, and this makes it easier to narrow the distance L1 shown in Figure 3, making it easier to achieve the transport state of the packaging container described above.

[0041] The packaging container shown in this embodiment is not limited to the above-mentioned content, and includes the positions, shapes, and dimensions of all parts, the relationships between parts, the order of specified processes, and the relationships between processes, as long as the same effect is obtained. [Explanation of symbols]

[0042] T Container Body 1 bottom portion, 2 leg portion, 3 body flange portion, 4 gap portion 2a 1st leg 21a 1st leg end 22a 1st gradual change section 23a 1st gradual change upper end 24a 1st gradual change lower end 2b 2nd leg 21b Second leg end 22b 2nd gradual change section 23b 2nd gradual change upper end 24b 2nd gradual change lower end C Lid body C1 cover part, C1a top surface part, C1b side wall part of the lid body, C1c corner part of the side wall of the lid body C2 Peripheral groove C3 Lid flange

Claims

1. a first leg portion protruding downward from a bottom surface portion on which contents are placed and a second leg portion adjacent to the first leg portion; a gap portion between an end portion of the first leg portion and an end portion of the second leg portion; a first gradually changing portion formed at an end of the first leg portion adjacent to the gap and gradually moving away from the second leg portion, and a second gradually changing portion formed at an end of the second leg portion and gradually moving away from the first leg portion, A distance between a lower end of the first gradually changing portion and a lower end of the second gradually changing portion on a projection plane from a front direction of one of the first gradually changing portion and the second gradually changing portion is 10 to 30 mm. A packaging container characterized by:

2. One of the first leg and the second leg is parallel to the direction of transport during production, and the other is perpendicular to the direction of transport.

2. The packaging container according to claim 1.

3. The distance is less than the center distance of each roller of the conveyor performing the movement in the transport direction.

2. The packaging container according to claim 1.

4. The gap corresponds to a corner of the bottom surface.

2. The packaging container according to claim 1.

5. A container body as the packaging container according to claim 1; a lid body having a cover portion that is surrounded in a circumferential direction by the first leg portion and the second leg portion when the container bodies are stacked. A packaging container characterized by:

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