JP7429419B2 - packaging containers - Google Patents

Description

The present invention relates to a packaging container obtained by molding a synthetic resin sheet, which has both visibility of contents through a lid and a structure that prevents collapse when a plurality of containers are stacked and displayed. be.

Packaging containers made from sheet molding, which are widely used in supermarkets and department stores, are often stacked flat for transportation or display after containing foodstuffs, etc., so stacked containers are easy to use. It is necessary to take measures to prevent it from collapsing.

Therefore, in the lid of the packaging container disclosed in Patent Document 1, slip-preventing protrusions are provided at the corners of the top plate portion, and the upper container body is fitted inside the protrusions.

On the other hand, in the packaging container disclosed in Patent Document 2, the lid has an inclined surface on the side of the top plate and a recess on the corner of the top plate, and the container main body has an inclined surface on the side of the top plate and a recess on the corner of the top plate. The sides are provided with legs that bulge downward, and the corners of the bottom wall are provided with protrusions, so that when the container main body is stacked on the lid, the inner surface of the leg portions will be tilted. The protrusion engages with the recess while contacting the surface, thereby preventing misalignment of the stacked containers and correcting misalignment even if it occurs.

Japanese Patent Application Publication No. 2013-14370 Japanese Patent Application Publication No. 2018-135111

However, the packaging containers of Patent Document 1 and Patent Document 2 have protrusions and recesses on the lid to prevent slippage, and the surface has a complicated shape, which makes it difficult to see the contents through the lid. There is an issue of being inferior. In other words, it is important for this type of packaging container to visually appeal to people's desire to purchase sashimi, prepared foods, etc., and visibility through the lid must be ensured. In the lid, visibility from angles passing through the protrusions provided at the corners of the top plate is lost due to the presence of protrusions for preventing slippage, and in the lid of Patent Document 2, the protrusions provided on the sides of the top plate lose visibility from angles passing through the protrusions. The slopes and recesses in the corners make it impossible to see the contents as they are.

Another issue is that with the packaging containers of Patent Documents 1 and 2, if the upper container accidentally shifts its position and tips, there is a risk that the stopper will not work and the container will fall. Not only will the contents become unevenly distributed within the container, damaging the product's value, but in the worst case scenario, the container will break and the contents and juice will leak out, contaminating the container underneath and surrounding products. It also leads to

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a packaging container that has extremely good visibility through the lid and that prevents stacked containers from collapsing.

In order to achieve the above-mentioned object, the present invention provides a packaging container comprising a lid body and a container body formed by sheet molding, and in which a plurality of containers can be stacked by loading the container bodies on the lid body. , the lid has a top plate portion whose entire surface is flat, and is connected downwardly around the top plate portion via a linear continuous portion, and at least a portion continuous with the continuous portion. The container body includes a side wall portion configured as a flat surface, and a radius of curvature on the surface side of the connecting portion is 0.6 mm or less, and the container body includes a bottom plate portion and leg portions protruding downward from the periphery of the bottom plate portion. The bottom plate portion and the leg portions form a loading concave portion having a concave cross section and an open bottom surface in the lid body.

According to the above means, the lid has a flat surface in which the entire surface of the top plate part and at least the part of the side wall part continuous with the top plate part are flat, and the continuous part has a radius of curvature of 0.6 mm or less. Since it has a relatively angular shape, visibility of the contents is extremely good, similar to glass.

In addition, when stacking packaging containers, by placing the container body of the upper container so that the loading recess fits into the lid of the lower container, it prevents the upper container from shifting in the plane direction and avalanche. However, in the present invention, as described above, the portion of the lid that fits into the loading concave portion is made of a flat surface, and there is no unevenness at all in that portion, and furthermore, the top plate portion and the side wall portion are connected to each other. Since the portion also has an angular shape, the loading concave portion of the upper container can be tightly fitted into the lid of the lower container. For this reason, it is possible to prevent the upper container from shifting and avalanche to a higher degree.

In addition, regarding the container body, if the radius of curvature of the inner corner formed by the bottom plate and the legs in the loading recess is set to 0.6 mm or less, the loading recess will be more tightly fitted into the lid, as described above. It is possible to improve the ability to prevent misalignment of the upper container.

Here, the above-mentioned radius of curvature is determined by the inventor to be the optimum value, but some errors are allowed as long as the effects of the present invention can be achieved. The point is that the lid body and the loading concave portion should fit together with a larger contact area, thereby increasing the ability to prevent the upper container from shifting. Regarding the lid, the expression that the continuous portion is linear means that there is no deformed portion such as a rib in the continuous portion. Furthermore, the surface side of the continuous portion means the outer surface side on the outside of the container. On the other hand, the radius of curvature on the back side of the continuous part, that is, on the inner surface side of the container, is naturally smaller than the radius of curvature on the front side, but the specific value depends on the thickness of the sheet material used and the size of the mold. It is not specified because it depends on the shape of the edge in contact with the continuous part.

On the other hand, the deeper the loading concave portion in the container body is, the deeper the fitting depth into the lid body becomes, and the ability to prevent the upper container from shifting increases. As a result, a configuration is realized in which the loading recess of the upper container tightly fits into the lid of the lower container, so that the depth of the loading recess can be made as shallow as possible. Accordingly, in the present invention, the protruding length of the legs that defines the depth of the loading recess may be set to 5 mm or less. According to this means, the protruding length of the legs can be reduced without reducing the ability to prevent displacement of the upper container. In addition, when the leg portion has a small protruding length, the moldability of the container body by sheet molding becomes good, and the productivity also improves. Further, when the depth of the loading concave portion is made shallow by reducing the protruding length of the legs, visibility from the side can be easily ensured even when stacked and displayed.

Up to this point, the specific shape of the container body has not been limited, except that the legs protrude downward from the periphery of the bottom plate and constitute, so to speak, the side walls of the loading recess. In this regard, in the present invention, the legs may have a shape in which the entire circumference is connected so as to form a similar shape to the bottom part. In this case, the legs have a completely closed shape, and when the containers are stacked, the upper shelf Although displacement of the container can be prevented in all directions, the moldability of the legs is reduced, and at the same time, the lid also needs to be molded with high precision so as to match the loading recess. On the other hand, if multiple legs are intermittently formed along the periphery of the bottom surface, the above-mentioned problem can be solved without reducing the ability to prevent misalignment etc., so it is reasonable. It is true. In particular, if a plurality of legs are formed around the bottom plate at positions avoiding the corners, the corners of the loading concave portion corresponding to the corners of the bottom plate are opened. Compared to the case where legs are present at the corners, the degree of freedom in designing the corners of the top plate of the lid body is increased, and in turn, it is possible to form the corners of the top plate into a shape with good visibility. can.

On the other hand, in the present invention, as a further specific configuration of the container main body, a main body peripheral wall portion rising upward on the outer peripheral side of the bottom plate portion, a main body flange portion extending outward from the main body peripheral wall portion, and a main body flange portion extending downward from the main body flange portion. and an extending skirt portion, the skirt portion having its lower edge positioned at the same level as the lower end portion of the leg portion formed between the bottom plate portion and the main body peripheral wall portion, or at a position lower than that. Use the method of extending the According to this means, even if for some reason the fitting of the loading recess of the upper container and the lid of the lower container becomes misaligned and the upper container is in a tilted position, the skirt portion of the lid of the lower container It can catch on the side wall of the snow and prevent it from falling.

Furthermore, in the present invention, as another configuration of the container main body, the bottom plate part is composed of a raised bottom part and a base part formed one step lower around the raised bottom part via a step part. In the vicinity of the stepped portion, a rib is provided that has a protruding length equal to or less than the height of the stepped portion and protrudes downward from the raised bottom portion. In this method, the contents such as food are mainly placed on the raised bottom, and the base around it functions as a part that receives the juice seeping out from the food, and serves as a part for attaching small items such as soy sauce and wasabi. do. As mentioned above, when returning the upper container that has suddenly become tilted to its original state (with the lid fitted into the loading recess), if the upper container is simply a two-tiered bottom with no ribs, There are times when the stepped portion gets caught on the corner of the lid of the lower container and the posture cannot be corrected smoothly. However, in the present invention, the rib rides on the corner of the lid of the lower container, and the stepped portion is caught on the corner of the lid of the lower container. In order to prevent the container from getting caught, the upper container can be smoothly returned to its original state if it is tilted.

In addition, the above-mentioned ribs reinforce the bottom plate part, especially the raised bottom part on which foodstuffs are placed, but in a more specific embodiment, the ribs cross the corners of the raised bottom part in a corner shape, and both ends are attached to the base part. By forming a straight line in plan view connected to two adjacent sides of the part, bending and twisting of the raised bottom part can be more reliably prevented.

Note that if the rib has a protruding length that exceeds the height of the step, when the upper container is tilted, the corner of the lid will be damaged in addition to the originally formed step between the raised bottom and the base. Since a new step part that can get caught is formed, in the present invention, as described above, the protrusion length is set to be less than the height of the step part to eliminate the problem of getting caught by the existing step part.

According to the packaging container of the present invention, visibility through the lid is extremely good, and stacked containers do not easily collapse. Further, even if the upper container is tilted and about to collapse, it will not collapse and the upper container can be smoothly returned to its original state.

A perspective view of a packaging container according to an embodiment of the present invention Same, top view of the lid body Same, side view of the lid body AA line end view in Figure 2 BB line end view in Figure 2 Process diagram showing the molding method of the present invention Same, plan view of the container body Same, side view of the container body C-C line end view in Fig. 7 An explanatory diagram showing the relationship between the lid and the container body when packaging containers are stacked. An explanatory diagram showing a state in which the container body is tilted due to misalignment. An explanatory diagram showing the procedure for correcting a tilted container body to its original position. A plan view of a container body according to another embodiment DD line end view in FIG. 13 An explanatory diagram showing the procedure for correcting a tilted container body to its original position. A plan view of the main part of the container body showing a modified example of the ribs

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a packaging container according to an embodiment of the present invention, in which a lid 10 and a container main body 20 are shown separated. Each configuration will be explained in detail.

First, to explain the structure of the lid body 10 in detail, FIGS. 2 and 3 are a plan view and a side view showing only the lid body 10, and it has a flange portion 11 that is attached to the opening edge of the container body 20 from the outside, Furthermore, the side surface of the flange portion 11 has a concave lid fitting portion 12 that fits into the main body fitting portion 21 . A portion that protects the contents stored in the container body 20 is composed of a top plate portion 1 and a side wall portion 2 continuous to the periphery thereof.

The top plate portion 1 has a rectangular shape in plan view, the entire surface of which is flat. A side wall portion 2 is connected to each of the four sides of the top plate portion 1 via a connecting portion 3. Each of the continuous parts 3 is a straight line in the horizontal direction along the four sides of the top plate part 1, but when viewed as a whole, it forms the same rectangular shape as the top plate part 1 in plan view.

In the case of this embodiment, the side wall portion 2 has a two-stage structure including an upper flat surface portion 4 and a lower flat surface portion 5 with a boundary portion 6 interposed therebetween, as clearly shown in FIG. Among these, the upper plane part 4 is connected to the top plate part 1 via the above-mentioned horizontal connection part 3, and the upper plane parts 4 adjacent to each other on the left and right are connected parts that are linear in the vertical direction. 7 are installed in succession. On the other hand, the lower plane part 5 is connected to the upper plane part 4 via the boundary part 6, and the lower plane parts 5 adjacent to each other on the left and right are connected to each other via the triangular chamfered part 8. Here, the upper plane part 4 and the lower plane part 5 have the same rising angle from the flange part 11 side to the top plate part 1 side, and are so-called flush, so they are actually linear as shown in the figure. Although there is no boundary part 6, there is a difference in the continuous structure between the adjacent pieces: the upper plane part 4 has a linear continuous part 7, and the lower plane part 5 has a triangular chamfered part 8. For convenience of explanation, it is designated as boundary part 6.

Note that a stacking protrusion 9 is formed on the side wall portion 2 so as to straddle the lower plane portion 5 and the flange portion 11 and bulge out to the outside of the container. This prevents the lids from completely fitting into each other when the lids 10 are overlapped, and when closing the container body 20 containing contents (foodstuffs, etc.), the lids 10 This makes it easy to take out the items one by one. With the exception of this stacking protrusion 9, the side wall 2 can be said to have a flat surface over its entire surface like the top plate 1, which is one of the characteristic features of the present invention.

The further characteristic structure of the lid body 10 will be explained with reference to FIGS. 4 and 5. First, the dihedral angle formed by the top plate part 1 and the side wall part 2 (upper plane part 4) is As a preferable example, both the long side and the short side of the lid body 10 are set at more than 90° and less than 105°. Specifically, the dihedral angle θ1 on the long side is set to 97.0°, as shown in FIG. It is set below. Further, the angle θ2 between the top plate portion 1 and the continuous portion 7 at the corner portion of the lid body 10 is set to 100.0°, as shown in FIG. Note that the two sets of dihedral angles on the long side and short side can be set to different angles as long as they are within the ranges described above. By making the angles different in this way, when containers containing contents are displayed, the appearance of the display can be varied compared to containers with the same angle, and it is possible to increase customer attraction.

Furthermore, in the continuous part 3 between the top plate part 1 and the side wall part 2 (upper plane part 4), and in the continuous part 7 between the side wall parts 2 (upper plane part 4), the radius of curvature R on the surface side is all It is set to 0.4 mm. This numerical value is also an example, and it is preferable to set it smaller, but if it is 0.6 mm or less, the object of the present invention can be achieved.

By having the top plate portion 1 and the side wall portions 2 configured as described above, the lid body 10 has good visibility while maintaining rigidity. In other words, in terms of rigidity, since the top plate part 1 is supported almost vertically by the side wall part 2, the load capacity is increased, and by forming the connecting parts 3 and 7 into an angular shape with an extremely small radius of curvature, it is easy to bend. Increased resistance to twisting.

Regarding visibility, the entire surface of the top plate part 1 is flat, the upper flat part 4 of the side wall part 2 is completely flat, and the lower flat part 5 is flat except for the stacking protrusion 9. Because of this, the contents can be viewed clearly and without distortion not only from directly above or diagonally above, but also from the side.

Note that the lid body 10 can best improve visibility if it is colorless and transparent, but the color and transparency are not limited. Furthermore, the molding material, that is, the sheet material, can be selected from conventionally known thermoplastic resins, but thermoplastic polyester resins such as PBT resin, PEN resin, PET resin, PETG resin, and SPG resin are suitable. . In particular, it is preferable to select PET resin, which has excellent workability, moldability, and cost.

Furthermore, when molding the lid 10 using a sheet material made of PET resin, the PET resin with an IV value (based on JIS K7367-1) of 0.70 to 0.85 has a moisture content (based on JIS K0113). It is preferable to use a sheet material having a Karl Fischer coulometric titration method of less than 1500 PPM and a thickness of 0.10 to 0.80 mm. Note that if the sheet thickness is in the range of 0.20 to 0.50 mm, it is possible to achieve both the above-mentioned rigidity and visibility at a higher level.

Next, a method of molding the lid 10 will be explained with reference to FIG. 6. (a) to (e) of the same figure are conceptual diagrams showing the molding process of the lid body 10. First, the above-mentioned sheet material 30 made of thermoplastic resin is heated and softened by the double-sided heater 31 (Fig. 6 (a)). Then, the sheet material 30 in a softened state is conveyed between the mold (male mold) 32 and the plug 33 (FIG. 6(b)), the mold 32 is raised, and its molding surface is pressed against the sheet material 30. guess (Figure 6(c)). In this state, the plug 33 is operated to seal the sheet material 30 with the mold 32, and vacuum is drawn through the numerous suction holes 32a provided through the mold 32 (FIG. 6(d)). ). Then, the mold 32 and the plug 33 are returned to their original positions and released (FIG. 6(e)), and then the excess portion is cut and trimmed to obtain the lid 10.

Here, a vacuum forming method has been described as a method for forming the lid body 10, but a pressure forming method in which a softened sheet material is brought into close contact with a mold using compressed air may also be adopted, and these vacuum forming methods and pressure forming methods may be used. It is also possible to adopt them at the same time.

Next, the configuration of the container body 20 will be explained in detail. As shown in FIGS. 7 and 8 together with FIG. 1, the container main body 20 in this embodiment includes a bottom plate portion 22, a main body peripheral wall portion 23 rising upward on the outer peripheral side thereof, and a main body extending outward from the main body peripheral wall portion 23. It includes a flange portion 24 and a skirt portion 25 extending downward from the main body flange portion 24 via the above-described main body fitting portion 21. The bottom plate portion 22 is rectangular in plan view and has approximately the same area as the top plate portion 1 of the lid body 10. After placing the contents such as food on the bottom plate portion 22, the lid body 10 is placed on the bottom plate portion 22, and the lid body fitting portion 12 and the main body fitting portion 21 of both are fitted, thereby completing the lid closing operation. . The rigidity and visibility of the packaging container with the lid closed in this manner have already been described in detail.

In this embodiment, the bottom plate portion 22 has a raised bottom shape. That is, the bottom plate part 22 has a raised bottom part 22a on the inner side, and forms a lower base part 22c surrounding the bottom part 22a with a step part 22b interposed therebetween. Among these, the raised bottom part 22a is the main part on which the contents are placed, and the base part 22c around it receives drips and excess oil seeped out from ingredients, etc., and also receives soy sauce, wasabi, etc. that are added as necessary. It also functions as a place to hold small items.

A plurality of leg portions 26 are provided intermittently on the outer periphery of the bottom plate portion 22 (base portion 22c) and inside the main body peripheral wall portion 23. In the case of this embodiment, the leg portions 26 are provided in a total of eight locations, two on each of the long and short sides of the container body 20, in a straight line shape in plan view. Here, one of the features of this embodiment is that each leg portion 26 is intentionally provided to avoid the corner portion 22d of the bottom plate portion 22. Note that this leg portion 26 is not necessarily a portion that literally supports the container body 20 (packaging container), and if the above-mentioned skirt portion 25 has a sufficiently long extension length, the skirt portion 25 substantially supports the container body 20 (packaging container). They may also function as legs of the main body 20.

As shown in FIG. 9, the leg portions 26 are formed to protrude downward from the bottom plate portion 22, and the inside of the leg portions 26 and the bottom plate portion 22 have a concave cross-section with an open bottom. A concave portion 27 is formed. In this embodiment, as a result of providing the leg portions 26 intermittently, the loading recessed portion 27 has a concave shape only in the cross section passing through the leg portion 26, but as will be described later, the lid 10 The function of fitting is achieved. In addition, in response to the fact that the bottom plate portion 22 has a raised bottom shape, the top surface portion of the loading recessed portion 27 has a two-tier configuration, but in this embodiment, the top surface is configured using the base portion 22c as a reference plane. ing. Then, the radius of curvature R1 of the inner corner 27a of the loading concave portion 27 formed by the leg portion 26 and the base portion 22c is set to 0, corresponding to the radius of curvature R of the surface side of the continuous portion 3 of the lid body 10. It is set to .6mm or less. Although the angle of the inner corner part 27a is not limited, it is recommended to make it correspond to the dihedral angle formed by the top plate part 1 and the side wall part 2 (upper plane part 4) in the lid body 10 to improve ease of fitting and to avoid horizontal deviation. It is effective in preventing

When the packaging containers containing the contents provided with the container body 20 described above are stacked flat in several tiers, the loading recess 27 is fitted into the lid 10 of the lower container as shown in FIG. The container bodies 20 of the upper container are loaded in such a manner that the container bodies 20 of the upper container are pushed together. When stacked in this way, in the present invention, the three-dimensional shape of the upper part into which the lid body 10 is fitted and the inner surface of the loading recessed part 27 of the container body 20 almost match, and in particular, the continuous part of the lid body 10 Since the curvature range R on the surface side of the container body 20 and the radius of curvature R1 of the inner corner of the loading concave portion 27 in the container body 20 match or have a similar correspondence relationship, the stacked state can be firmly maintained.

Note that the depth of the loading concave portion 27 is determined by the protruding length of the leg portion 26, and the deeper the depth, the higher the holding force in the fitted state. Regarding the above, the top plate part 1 and the side wall part 2 are configured to be flat, the curvature range R of the surface side of the continuous part 3 in the lid body 10, and the inner corner part 27a of the loading concave part 27 in the container body 20. By making the radius of curvature R1 match or approximate, it is possible to firmly maintain the stacked state, and therefore the depth of the loading concave portion 26 can be made as small as possible. Specifically, it is sufficient for the protrusion length of the leg portion 26 to be 5 mm with respect to the base portion 22c, and by making it shorter, the moldability of the container body 20 is improved and productivity is improved.

Further, in this embodiment, as described above, the legs 26 are avoided from being placed in the corners 22d of the bottom plate 22, and the loading recesses 27 are intentionally left open at the corners. (a mode with no corner portions). This aspect increases the degree of freedom in designing the lid body 10 and allows a configuration that prioritizes visibility, which is a more preferable configuration. On the other hand, if the L-shaped legs 26 are provided along the corner 22d of the bottom plate 22 to form the corner of the recessed part for loading, the top plate 1 of the lid 10 is also used for loading. The shape must accurately fit the corner of the concave portion, which imposes restrictions on the moldability of the lid 10. However, the present invention does not plan to completely eliminate such a configuration, and may arbitrarily adopt it.

As described above, in the present invention, even if the packaging containers stacked flat are subjected to external force from the side or some vibration, the stacked state (fitted into the loading recess) is firmly maintained. For example, After the consumer picks up the container, the position may shift from its normal position, and the container body 20 of the upper container may be placed diagonally against the lid 10 of the lower container while the loading recess 27 remains unfitted. There may be a condition. FIG. 11 shows a state in which the loading concave portion 27 is disengaged for some reason, and the container body 20 of the upper container is slanted to the lid 10 of the lower container. If the upper container were to tilt in this way, the conventional structure would not be effective in preventing the upper container from tilting, and there was a risk that the upper container would slide away. However, according to the present invention, the extension length of the skirt portion 25 of the container body 20 is set sufficiently long, so that even if the container body 20 is tilted, the lower end edge 25a of the skirt portion 25 is attached to the lid 10 of the lower container. It is possible to prevent the upper container from collapsing due to getting caught on the upper corner portion (side wall portion 2). In particular, since the connecting portions 3 and 7 of the lid body 1 are formed into an angular shape with an extremely small radius of curvature, the lower end edge 25a of the skirt portion 4 including this portion is easily caught. In this case, the extension length of the skirt portion 25 depends on the size of the lid 10, etc., but it should be at least at the same level as the lower end 26a of the leg 26, and more preferably at the same level as the lower end 26a of the leg 26. Also, the extension length should be such that it protrudes downward.

On the other hand, in order to restore the tilted upper container as described above, as shown in FIG. )). However, depending on the weight of the contents of the container main body 20, the stepped portion 22b of the upper container may get caught on the upper corner portion (corresponding to the continuous portion 3) of the lid 10 of the lower container midway through the process. It may be difficult to slide the upper container.

Another embodiment of the container body 40 that has been improved in this respect will be described with reference to FIGS. 13 and 14. In the container body 40 as well, the inner side of the bottom plate portion 41 is raised and the bottom portion 42 is raised, and a step portion 43 is formed around the bottom portion 42. The structure in which a lower base part 44 is formed through the raised base part 44 is the same as in the above embodiment, but here, a rib 45 having a rectangular shape in plan view is provided near the stepped part 43 and projects downward from the raised bottom part 42. ing. More specifically, the ribs 45 are provided at the four corners of the raised bottom portion 42 (FIG. 13), and their protrusion length H1 is set to be approximately the same length as the height H0 of the stepped portion 43.

According to the container body 40 provided with such a rib 45, even if the upper container is tilted, the rib 45 rides on the upper corner of the lid 10 of the lower container (FIG. 15(a)), preventing the upper container from tilting. Even while the ribs 45 are being slid in the direction to eliminate them, the ribs 45 serve as guides and slide against the top plate 1 of the lid 10 of the lower container (FIG. 15(b)), so that the step 43 located on the outside of the ribs 45 does not slide even once. The upper container can be smoothly returned to its original position without getting caught on the upper corner of the lid 10 (FIG. 15(c)).

In addition to the above-mentioned guide function, the rib 45 also has the function of reinforcing the bottom plate part 41, but if its protrusion length H1 is too large, the lid 10 of the lower container apart from the original step part 43 A new stepped portion is created in which the upper corner of the container gets caught, and the formability of the container body 40 is also affected. Therefore, in the present invention, the protrusion length H1 of the rib 45 is set to be equal to or less than the height H0 of the stepped portion 43.

In this regard, in the modified example shown in FIG. 16, the rib 50 crosses the corner 52 of the raised bottom 51 in a corner shape, and both ends thereof are connected to the base 53a on the adjacent long side via the step 53. It is formed in a straight line shape in plan view connected to each of the short side base portions 53b. Therefore, even though the rib 50 has a relatively small protruding length, it exhibits a reinforcing function that more reliably prevents the raised bottom portion 51 from bending or twisting. Of course, the ribs 50 can smoothly return the collapsing upper container to its original position due to the guide function described above.

1 Top plate part 2 Side wall parts 3 and 7 Continuous part 4 Upper flat part 5 Lower flat part 6 Boundary part 8 Chamfered part 9 Stacking protrusion 10 Lid bodies 20, 40 Container body 21 Main body fitting parts 22, 41 Bottom plate part 22a, 42, 51 Raised bottom parts 22b, 43, 53 Step parts 22c, 44, 53a, 53b Base part 23 Main body peripheral wall part 24 Main body flange part 25 Skirt part 26 Leg part 27 Concave part for loading 30 Sheet material 31 Heater 32 Mold (male type)
32a Suction hole 33 Plug 45, 50 Rib

Claims (6)

A packaging container consisting of a lid body and a container body formed by sheet molding, and in which a plurality of containers can be stacked by loading the container body on the lid body,
The lid body is
A top plate portion whose entire surface is made of a flat surface,
A side wall portion that is connected downwardly around the top plate portion via a linear connecting portion, and at least a portion continuous with the connecting portion is configured as a flat side wall portion,
The radius of curvature on the surface side of the continuous portion is 0.6 mm or less,
The container body is
A bottom plate portion;
and legs protruding downward from the periphery of the bottom plate,
The bottom plate portion and the leg portions form a loading concave portion with a concave cross section with an open bottom surface, with respect to the lid body ;
The bottom plate portion includes a raised bottom portion and a base portion formed one step lower around the raised bottom portion via a step portion, and a base portion of the stepped portion is provided at a corner of the raised bottom portion near the step portion. A packaging container characterized in that a rib is provided that has a protruding length equal to or less than the height and protrudes downward from the raised bottom portion . 2. The packaging container according to claim 1, wherein the radius of curvature of the inner corner formed by the bottom plate part and the leg part in the loading recessed part is 0.6 mm or less. The packaging container according to claim 1 or 2, wherein the protruding length of the leg portion that defines the depth of the loading concave portion is 5 mm or less. Claim 1, wherein the loading concave portion is formed with a plurality of leg portions at positions around the bottom plate portion, avoiding the corners, so that corner portions corresponding to the corners of the bottom plate portion are open. The packaging container according to 2 or 3. The container body further includes a body peripheral wall portion rising upward on the outer peripheral side of the bottom plate portion, a body flange portion extending outward from the body peripheral wall portion, and a skirt portion extending downward from the body flange portion, Claims 1 to 4, wherein the skirt part has a lower edge thereof extending to a level at or below the lower end of the leg part formed between the bottom plate part and the main body peripheral wall part. A packaging container as described in any one of the following. The packaging according to any one of claims 1 to 5, wherein the rib has a straight shape in plan view, crossing the corner of the raised bottom part in a corner shape and connecting both ends to two adjacent sides of the base part. container.

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