JP7535779B2 - Packaging containers - Google Patents

Description

The present invention relates to a packaging container.

For example, packaging containers are used to package foods such as boxed lunches and side dishes. In many cases, such packaging containers are formed by sheet molding. One example of such a sheet-formed packaging container is disclosed in JP 2010-184742 A (Patent Document 1). In the packaging container (container with lid 5) of Patent Document 1, a main body engaging portion (concave groove 24) provided on the main body skirt portion (outer peripheral wall 15) of the container main body (container main body 1) engages with a lid body engaging portion (convex groove 32) provided on the lid body skirt portion (external fitting portion 15) of the lid body (lid body 3), thereby maintaining the lid in an appropriate closed state. In addition, when opening the lid, the gripping portion (tongue piece 37) provided on the lid body can be gripped to release the engagement between the main body engaging portion and the lid body engaging portion, and the lid body can be removed from the container main body.

However, if some external force is applied to the knob from below when the lid is closed, there is a risk that the lid may come off unintentionally from the container body. On the other hand, if the body engaging portion and the lid engaging portion are formed so that the mating force is large to prevent the lid from coming off unintentionally, the lid will be difficult to remove even during normal opening operations.

JP 2010-184742 A

It is desirable to develop a packaging container that can be easily opened when necessary and whose lid will not easily come off even if unintentional external force is applied.

The packaging container according to the present invention comprises:
A packaging container comprising a container body and a lid body and formed by sheet molding,
The container body and the lid body are formed in a rectangular shape in a plan view,
The container body has a bottom surface portion, a main body peripheral wall portion extending upward from the bottom surface portion, a main body flange portion extending outward from the main body peripheral wall portion, a main body skirt portion extending downward on the peripheral side of the main body flange portion, and a main body engaging portion provided on the main body skirt portion,
the lid has a top surface portion, a lid peripheral wall portion extending downward from the top surface portion, a lid flange portion extending outward from the lid peripheral wall portion and overlapping with the main body flange portion, a lid skirt portion extending downward on the peripheral side of the lid flange portion and covering the main body skirt portion from the outside, a lid engagement portion provided on the lid skirt portion and engaging with the main body engagement portion, and a knob portion consisting of a protruding piece protruding outward beyond the lid flange portion,
The rectangular container body and the lid body are provided with corner cutting portions formed in a corner cutting shape at all four corners thereof,
The gripping portion is provided on at least one of the four corner cutting portions,
The knob has an upward extension portion that extends upward from the lower end of the lid skirt portion, and a knob main body portion that extends outward from the upper end of the upward extension portion at a position lower than the lid flange portion.

According to this configuration, the closed state is properly maintained by engaging the main body engaging portion provided on the main body skirt portion of the container body with the lid engaging portion provided on the lid skirt portion of the lid. The knob protrudes outward from the flange portion, but since the knob main body is connected to the lid skirt portion via the upward extension portion, even if an unintended external force is applied to the knob main body in the closed state, the upward extension portion can easily bend and release the external force. When opening the lid, the knob main body is gripped to release the engagement between the main body engaging portion and the lid engaging portion, allowing the lid to be removed from the container body without any problems. At that time, the knob main body is operated in a state where a force can be easily applied to the lid between the lower end and the upper end of the lid skirt portion, and the lid can be easily removed from the corner where the knob is provided among the four corners of the rectangular container body and lid. As described above, a packaging container can be realized that can be easily opened when necessary and in which the lid is not easily removed even when an unintended external force is applied.

The following describes preferred embodiments of the present invention. However, the scope of the present invention is not limited to the preferred embodiments described below.

In one embodiment,
It is preferable that at least one of the main body skirt portion and the lid skirt portion has a flexural deformation promoting portion on both sides of the corner cutting portion at the position where the knob portion is provided, which promotes flexural deformation in the direction in which the main body flange portion and the lid flange portion move away from each other.

With this configuration, when the gripping body is gripped to open the lid, the presence of the flexural deformation promoting portion makes it easy to cause flexural deformation of at least one of the container body and the lid in a direction in which the body flange portion and the lid flange portion move away from each other. This makes it easy to disengage the body engaging portion from the lid engaging portion, making it even easier to remove the lid.

In one embodiment,
It is preferable that the flexural deformation promoting portion is configured by a notch portion formed by cutting out the main body skirt portion or the lid skirt portion from a lower end portion thereof.

With this configuration, a bending deformation promoting section can be easily provided on at least one of the main body skirt section and the lid skirt section by simply cutting out a portion of the main body skirt section or the lid skirt section.

In one embodiment,
It is preferable that the notch has an R-shaped bottom.

With this configuration, even when at least one of the container body and the lid is bent, stress is less likely to concentrate on the bottom of the notch that constitutes the bending deformation promoting portion. This makes it less likely that cracks will occur in the skirt portion of the body or the skirt portion of the lid.

Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which are given with reference to the drawings.

Exploded perspective view of a packaging container Exploded front view of packaging container Exploded side view of packaging container Plan view of the container body Plan view of the lid VI-VI cross-sectional view in FIG. 4 and FIG. 5. FIG. 13 is a perspective view showing an example of a lid opening operation. FIG. 13 is a diagram showing the deformation state of the container body and the lid body during the lid opening operation.

An embodiment of a packaging container will be described with reference to the drawings. In this embodiment, a packaging container (food packaging container) 1 that contains food items such as sushi and side dishes will be described as an example.

In the following, the direction toward the inside of the packaging container 1 (direction from the outer edge toward the center) is referred to as "inner", and the direction toward the outside of the packaging container 1 (direction from the center toward the outer edge) is referred to as "outer".

As shown in Figs. 1 to 3, the packaging container 1 includes a container body 3 and a lid body 5. The packaging container 1 is formed by sheet molding. The container body 3 and the lid body 5 constituting the packaging container 1 are each formed by sheet molding. In this embodiment, the container body 3 and the lid body 5 are formed by thermoforming a non-foamed thermoplastic resin sheet. The non-foamed thermoplastic resin sheet includes a non-foamed thermoplastic resin layer mainly made of a thermoplastic resin. The thermoplastic resin constituting the non-foamed thermoplastic resin layer is not particularly limited. For example, general thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyester (polyethylene terephthalate, etc.), and acrylic resin can be used as appropriate. Each of these may be a homopolymer, a copolymer with other monomers, a mixture with other resins, or a combination thereof.

The container body 3 may be formed by thermoforming a thermoplastic resin foam sheet or a laminated sheet of a thermoplastic resin foam sheet and a thermoplastic resin non-foam sheet. The container body 3 may be formed to be colored or colorless. It is preferable that the lid 5 is formed to be colorless.

As shown in Figures 4 and 5, the packaging container 1 of this embodiment is formed in a rectangular shape when viewed from above. That is, the container body 3 and the lid body 5 constituting the packaging container 1 are formed in a rectangular shape when viewed from above. "Rectangular shape when viewed from above" means that the external shape when viewed from above is rectangular or approximately rectangular overall. Therefore, as long as the external shape when viewed from above is approximately rectangular overall, the container body 3 and the lid body 5 may be formed with at least one of their four sides bent or curved. Also, at least one of their four corners may be formed with a rounded corner.

In this embodiment, the packaging container 1 (container body 3 and lid body 5) is formed in a rectangular shape in a plan view, having a pair of long sides L and a pair of short sides S. In addition, corner cutting portions C are provided at all four corners of the rectangular container body 3 and lid body 5.

As shown in Figures 1 to 4, the container body 3 has a bottom surface portion 31, a body peripheral wall portion 32, a body flange portion 33, a body skirt portion 34, and a body engagement portion 35.

The bottom surface portion 31 constitutes the bottom of the container body 3. The bottom surface portion 31 serves as a placement portion on which food, which is the object to be contained, is placed. In addition, a downwardly recessed groove portion 31A is formed at each of the four corners of the bottom surface portion 31. In response to the formation of such groove portion 31A, a leg portion 31B is formed at each of the four corners of the bottom surface portion 31. The leg portion 31B serves as a portion that supports the container body 3 when the container body 3 is placed on a display stand, table, etc. In addition, when multiple packaging containers 1 are stacked one above the other, the leg portion 31B is engaged with a corner recess portion 51A formed in the top surface portion 51 of the lid body 5 of the lower packaging container 1 to hold it in position.

The main body peripheral wall portion 32 is formed so as to extend upward from the bottom surface portion 31. The main body peripheral wall portion 32 is formed so as to incline outward as it extends upward. The main body peripheral wall portion 32 is formed in an annular shape so as to surround the periphery of the bottom surface portion 31. The main body peripheral wall portion 32, together with the bottom surface portion 31, forms a storage portion for storing the stored object. In this embodiment, a plurality of peripheral wall rib portions 32A extending in the up-down direction are formed in the main body peripheral wall portion 32 in a circumferential arrangement.

The body flange portion 33 extends outward from the body peripheral wall portion 32. The body flange portion 33 extends horizontally outward from the upper end of the body peripheral wall portion 32. The body flange portion 33 has a total of four body side flange portions 33A provided on a pair of long side portions L and a pair of short side portions S, and a total of four body corner cutting flange portions 33B provided between adjacent body side flange portions 33A at the corner cutting portion C. The cover body flange portion 53 of the cover body 5 is overlapped on the body flange portion 33 in the closed state.

The body skirt portion 34 extends downward on the peripheral side of the body flange portion 33. Specifically, the body skirt portion 34 extends downward from the outer end of the body flange portion 33. The body skirt portion 34 is formed around the entire circumference of the container body 3. The body skirt portion 34 is formed so as to slope slightly downward as it extends outward, and then hang down. When the lid is closed, the body skirt portion 34 is covered from the outside by the lid skirt portion 54 of the lid body 5.

A main body engaging portion 35 is provided on the hanging portion (hanging wall portion) of the main body skirt portion 34. In this embodiment, the main body engaging portion 35 is formed as a groove portion recessed inward. The groove portion constituting the main body engaging portion 35 is formed continuously around the entire circumference of the container body 3. In the closed state, the main body engaging portion 35 engages with a lid engaging portion 55 formed on the lid skirt portion 54 of the lid body 5.

As shown in Figures 1 to 3 and 5, the lid 5 has a top surface portion 51, a lid peripheral wall portion 52, a lid flange portion 53, a lid skirt portion 54, a lid engagement portion 55, and a knob portion 56.

The top surface 51 constitutes the ceiling of the lid 5. The top surface 51 is formed as a flat surface. In addition, corner recesses 51A that are recessed downward are formed at the four corners of the top surface 51. The corner recesses 51A are formed in an L-shape when viewed from above. When multiple packaging containers 1 are stacked one above the other, the legs 31B formed on the bottom surface 31 of the container body 3 of the upper packaging container 1 are engaged with the corner recesses 51A.

The lid peripheral wall 52 is formed to extend downward from the top surface 51. The lid peripheral wall 52 is formed to incline outward as it extends downward. The lid peripheral wall 52 is formed in a ring shape to surround the periphery of the top surface 51. The lid peripheral wall 52 has a total of four lid side peripheral wall portions 52A provided on a pair of long side portions L and a pair of short side portions S, and a total of four lid corner cutting peripheral wall portions 52B provided between adjacent lid side peripheral wall portions 52A at the corner cutting portion C. In this embodiment, of the four lid corner cutting peripheral wall portions 52B, two lid corner cutting peripheral wall portions 52B located diagonally are provided with recessed portions 52C that are recessed inwardly in a concave shape (see FIG. 5).

The lid flange portion 53 extends outward from the lid peripheral wall portion 52. The lid flange portion 53 extends outward horizontally from the lower end of the lid peripheral wall portion 52. The lid flange portion 53 has a total of four lid edge flange portions 53A provided on a pair of long side portions L and a pair of short side portions S, and a total of four lid corner cutting flange portions 53B provided between adjacent lid edge flange portions 53A at the corner cutting portion C. The lid flange portions 53 are overlapped with the main body flange portion 33 of the container body 3 in the closed state. The lid edge flange portions 53A are overlapped with the main body edge flange portion 33A, and the lid corner cutting flange portions 53B are overlapped with the main body corner cutting flange portion 33B.

As described above, in this embodiment, of the four lid corner cutting peripheral wall portions 52B, two diagonally located lid corner cutting peripheral wall portions 52B are provided with recessed portions 52C that are recessed inwardly in a concave shape. As a result, the boundary line between the lid peripheral wall portion 52 and the lid flange portion 53 at the corner cutting portion C where the recessed portions 52C are provided forms an inwardly convex arc shape. As a result, the lid flange portion 53 at this position becomes a wide portion 53C that is formed wider than other portions. In this embodiment, multiple fine protrusions 53D are formed on this wide portion 53C (see FIG. 5).

The lid skirt portion 54 extends downward on the peripheral side of the lid flange portion 53. Specifically, the lid skirt portion 54 extends downward from the outer end of the lid flange portion 53. The lid skirt portion 54 is formed around the entire circumference of the lid 5. The lid skirt portion 54 is formed so as to slope slightly downward as it extends outward, and then hang down. The lid skirt portion 54 covers the main body skirt portion 34 of the container body 3 from the outside when the lid is closed.

The lid body engagement portion 55 is provided on the hanging portion (hanging wall portion) of the lid body skirt portion 54. In this embodiment, the lid body engagement portion 55 is formed as a linear protrusion that protrudes inward in a straight line shape. The linear protrusions that make up the lid body engagement portion 55 are formed intermittently in the circumferential direction. Specifically, the linear protrusions that make up the lid body engagement portion 55 are formed independently at both ends and the center of the pair of long side portions L, independently at only both ends of the pair of short side portions S, and formed over substantially the entire area of the corner cut portion C. The lid body engagement portion 55 engages with the main body engagement portion 35 formed on the main body skirt portion 34 of the container main body 3.

As shown in FIG. 6, the groove that constitutes the main body engaging portion 35 and the linear protrusion that constitutes the lid engaging portion 55 each have an inclined surface that slopes inward as it extends downward. The lid engaging portion 55 enters the main body engaging portion 35 from the outside, and the inclined surface of the main body engaging portion 35 and the inclined surface of the lid engaging portion 55 can engage with each other, making it difficult for the lid 5 to come off the container body 3. For this reason, even if an unintended external force is applied, for example, while the packaging container 1 is being transported, it is easy to properly maintain the lid closed state.

The knob 56 is formed of a protruding piece that protrudes outward from the lid flange 53. The knob 56 is provided at the corner cut portion C. The knob 56 is provided at at least one of the four corner cut portions C. In this embodiment, the knob 56 is provided at two corner cut portions C that are diagonally located among the four corner cut portions C. More specifically, the knob 56 is provided at two corner cut portions C that are diagonally located among the four corner cut portions C and have the wide portion 53C.

6 and 7, the knob 56 has an upward extension 56A and a knob body 56B. The upward extension 56A extends upward from the lower end of the lid skirt 54. The upward extension 56A is formed so as to incline outward as it extends upward. The knob body 56B extends outward from the upper end of the upward extension 56A. The knob body 56B is formed in a flat shape and extends outward in a horizontal position. The knob body 56B is disposed at a lower position than the lid flange 53. In other words, the knob body 56B is disposed at a lower position than the upper end of the lid skirt 54. In this embodiment, the knob body 56B is disposed at a height position approximately equal to that of the lid engagement portion 55.

The knob 56 further has a raised portion 56C. The raised portion 56C is formed to be raised upward in the center of the flat knob body portion 56B. In this embodiment, the raised portion 56C is also located at a lower position than the lid flange portion 53 (and the upper end of the lid skirt portion 54). That is, the knob 56 is configured with an upward extension portion 56A extending upward from the lower end of the lid skirt portion 54 and a knob body portion 56B extending outward from the upward extension portion 56A, and the entire knob 56 including the raised portion 56C rising upward from the knob body portion 56B is located between the lower end and the upper end of the lid skirt portion 54. Note that the knob 56 is provided only on the lid 5, and no corresponding portion is provided on the container body 3.

As shown in Figures 1 to 3, in this embodiment, the main body skirt portion 34 has bending deformation promoting portions 37 that promote bending deformation in a direction in which the main body flange portion 33 and the lid flange portion 53 move away from each other, at least on both sides of the corner cut portion C at the position where the knob portion 56 is provided on the lid body 5. In this embodiment, bending deformation promoting portions 37 are provided on both sides of all corner cut portions C, including positions where the knob portion 56 is not provided on the lid body 5. Since the container body 3 is located below the lid body 5, the bending deformation promoting portions 37 provided on the main body skirt portion 34 serve to promote the downward bending of the main body flange portion 33 and the main body skirt portion 34.

In this embodiment, the deflection deformation promoting portion 37 is composed of a notch 38 formed by cutting the main body skirt portion 34 from its lower end. As shown in FIG. 6, the notch 38 constituting the deflection deformation promoting portion 37 has a pair of notch sides 38A and a notch bottom 38B. The pair of notch sides 38A are sides facing each other in the circumferential direction, and are arranged at an incline so that the distance between them is slightly narrower at the upper end side than at the lower end side. The notch bottom 38B connects the upper ends of the pair of notch sides 38A. In this embodiment, the notch bottom 38B is formed in an upwardly convex R shape. The notch 38 allows the deformation of the main body skirt portion 34 such that the lower ends of the pair of notch sides 38A approach each other with the notch bottom 38B as a fulcrum, thereby promoting the downward deflection of the main body flange portion 33 and the main body skirt portion 34 as described above. At this time, because the notch bottom 38B is formed in an R-shape, even when the main body skirt portion 34 is bent and deformed, stress is less likely to concentrate on a specific part of the notch bottom 38B that serves as the fulcrum for the deformation. This makes it less likely for cracks to occur in the main body skirt portion 34.

In this embodiment, as shown in Figures 1 to 3, a protrusion 58 that protrudes slightly outward is provided at a position on the lid skirt portion 54 that corresponds to the notch 38 of the main body skirt portion 34. The protrusion 58 has a shape that corresponds to the notch 38, and is formed slightly larger than the notch 38. The protrusion 58 of the lid skirt portion 54 covers the notch 38 of the main body skirt portion 34 from the outside when the lid is closed. This provides the notch 38 in the main body skirt portion 34 to promote flexing of the main body flange portion 33 and the main body skirt portion 34, while avoiding a loss of design when the lid is closed.

To remove the lid 5 from the container body 3, for example, as shown in FIG. 7, the gripping portion 56 is pinched from above and below with two fingers F (e.g., thumb and index finger) while the tip of the upper finger F (e.g., thumb) is placed on the wide portion 53C of the lid flange 53. At this time, the boundary between the lid peripheral wall 52 and the lid flange 53 at the wide portion 53C forms an inwardly convex arc, so that the shape of the fingertips easily fits and the fingertips can be easily placed on the wide portion 53C. In addition, multiple fine protrusions 53D are formed on the wide portion 53C, so that the fingertips can be prevented from slipping when placed on the wide portion 53C.

In this state, as shown in the upper part of FIG. 8, the fingertip of the finger F placed on the wide portion 53C is used as a fulcrum to pull up the pinched portion 56 pinched by the two fingers F diagonally upward. At this time, the pinched portion 56B of the pinched portion 56 has a raised portion 56C formed thereon, and a recess is formed on the underside, so that the lower finger F can be hooked on the recess to easily pull up the pinched portion 56. This pull-up operation causes the lid skirt portion 54 to deform into a hairpin-shaped cross section while maintaining the close contact between the main body flange portion 33 and the lid flange portion 53, and causes the upper extension portion 56A and the pinched portion 56B that constitute the pinched portion 56 to deform into a substantially flush shape. In addition, the container body 3 is deformed so that the portion between the two bending deformation promoting portions 37 (notches 38) located on both sides of the pinched portion 56 is bent downward. Then, the linear protrusions that make up the lid engagement part 55 disengage upward from the recessed grooves that make up the main body engagement part 35.

Once the lid engaging portion 55 has been released from the main body engaging portion 35, as shown in the lower part of Figure 8, the lid engaging portion 55 engages from above with the inclined portion (inclined wall portion) of the main body skirt portion 34, and even if the finger F is released, the lid engaging portion 55 and the main body engaging portion 35 will not re-engage. If the finger F is then used to pinch the main body portion 56B and the raised portion 56C and pull up further, the other lid engaging portions 55 will also release sequentially from the main body engaging portion 35, and the lid 5 can finally be removed from the container main body 3. In this way, the lid opening operation can be easily performed.

Other embodiments
(1) In the above embodiment, a configuration has been described in which the knobs 56 are provided on two diagonally opposite corner cutting portions C of the four corner cutting portions C. However, the present invention is not limited to such a configuration, and for example, the knob 56 may be provided on only one of the four corner cutting portions C. Alternatively, the knob 56 may be provided on all of the four corner cutting portions C.

(2) In the above embodiment, an example was described in which the knob 56 has an upward extension 56A, a knob body 56B, and a raised portion 56C. However, the knob 56 is not limited to such a configuration, and may be configured to have only the upward extension 56A and the knob body 56B.

(3) In the above embodiment, a configuration in which the bending deformation promoting portion 37 is provided only on the main body skirt portion 34 has been described as an example. However, the present invention is not limited to such a configuration, and the bending deformation promoting portion may be provided only on the lid skirt portion 54. In this case, the bending deformation promoting portion provided on the lid skirt portion 54 serves to promote the upward bending of the lid flange portion 53 and the lid skirt portion 54. Alternatively, the bending deformation promoting portion may be provided on both the main body skirt portion 34 and the lid skirt portion 54.

(4) In the above embodiment, an example was described in which the flexural deformation promoting portion 37 was configured as a notch 38. However, the present invention is not limited to such a configuration, and the flexural deformation promoting portion 37 may be configured as, for example, a notch extending from the lower end of the main body skirt portion 34. Alternatively, the flexural deformation promoting portion 37 may not be provided.

(5) In the above embodiment, a configuration in which multiple fine protrusions 53D are formed on the wide portion 53C of the lid flange portion 53 has been described as an example. However, the present invention is not limited to such a configuration, and the wide portion 53C does not necessarily have to have fine protrusions 53D formed thereon.

(6) In the above embodiment, the lid flange portion 53 has a wide portion 53C at the position of the corner cut portion C where the knob portion 56 is provided. However, the present invention is not limited to such a configuration, and the lid flange portion 53 may be configured to have a constant width around the entire circumference without having a wide portion 53C, including at the position where the knob portion 56 is provided.

(7) In the above embodiment, the main body engaging portion 35 (groove portion) is formed continuously around the entire circumference of the container body 3 as an example. However, the present invention is not limited to such a configuration, and the main body engaging portion 35 (groove portion) may be formed intermittently in the circumferential direction of the container body 3. In this case, the main body engaging portion 35 (groove portion) and the lid engaging portion 55 (linear protrusion) are formed at corresponding positions so that they can engage with each other. The position of the lid engaging portion 55 (linear protrusion) is not limited to that of the above embodiment, and may be appropriately set in consideration of the required fitting force, ease of opening the lid, etc. In addition, the main body engaging portion 35 does not necessarily have to be formed by a groove portion formed in the main body skirt portion 34, and may be formed by, for example, the lower edge of the main body skirt portion 34.

(8) In the above embodiment, the packaging container 1 (container body 3 and lid 5) is described as being rectangular in plan view. However, the present invention is not limited to such a configuration, and the packaging container 1 may be formed in other rectangular shapes, such as a square, parallelogram, or trapezoid.

(9) The configurations disclosed in each of the above-described embodiments (including the above-described embodiments and other embodiments; the same applies below) can also be applied in combination with configurations disclosed in other embodiments, as long as no contradiction arises. As for other configurations, the embodiments disclosed in this specification are illustrative in all respects and can be modified as appropriate within the scope of the present disclosure.

1 Packaging container 3 Container body 5 Lid 31 Bottom surface portion 32 Body peripheral wall portion 33 Body flange portion 34 Body skirt portion 35 Body engagement portion 37 Bending deformation promoting portion 38 Notch portion 38B Notch bottom 51 Top surface portion 52 Lid peripheral wall portion 52C Recessed portion 53 Lid flange portion 53C Wide portion 53D Fine protrusion 54 Lid skirt portion 55 Lid engagement portion 56 Knob portion 56A Upward extension portion 56B Knob body portion 56C Raised portion C Corner cut portion

Claims (4)

A packaging container comprising a container body and a lid body and formed by sheet molding,
The container body and the lid body are formed in a rectangular shape in a plan view,
The container body has a bottom surface portion, a main body peripheral wall portion extending upward from the bottom surface portion, a main body flange portion extending outward from the main body peripheral wall portion, a main body skirt portion extending downward on the peripheral side of the main body flange portion, and a main body engaging portion provided on the main body skirt portion,
the lid has a top surface portion, a lid peripheral wall portion extending downward from the top surface portion, a lid flange portion extending outward from the lid peripheral wall portion and overlapping with the main body flange portion, a lid skirt portion extending downward on the peripheral side of the lid flange portion and covering the main body skirt portion from the outside, a lid engagement portion provided on the lid skirt portion and engaging with the main body engagement portion, and a knob portion consisting of a protruding piece protruding outward beyond the lid flange portion,
The rectangular container body and the lid body are provided with corner cutting portions formed in a corner cutting shape at all four corners thereof,
The gripping portion is provided on at least one of the four corner cutting portions,
The knob portion has an upward extension portion extending upward from a lower end portion of the lid skirt portion, a knob main body portion extending outward from an upper end portion of the upward extension portion at a position lower than the lid flange portion, and a protruding portion protruding upward in a central portion of the knob main body portion,
The main body skirt portion has a bending deformation promoting portion on both sides of the corner cutting portion at the position where the knob is provided, which promotes bending deformation in the direction in which the main body flange portion and the lid flange portion move away from each other. The bending deformation promoting portion is configured by a notch portion formed by cutting out the main body skirt portion from its lower end portion,
2. The packaging container according to claim 1, wherein the lid skirt portion has a protrusion that covers the notch from the outside when the lid is closed. The packaging container according to claim 2, wherein the protrusion corresponds to the notch formed in the body skirt portion and is formed to have a shape slightly larger than the notch. 4. The packaging container according to claim 2 or 3 , wherein the cutout portion has an R-shaped cutout bottom.

Images