JP7649507B2 - Packaging containers - Google Patents

Description

This invention relates to a packaging container consisting of a container body and a lid.

Conventionally, packaging containers consisting of a container body for storing food such as prepared foods and a lid that can be attached to the container body have been used in supermarkets, convenience stores, etc.

For example, the packaging container in Patent Document 1 is a packaging container that includes a container body with convex ridges and a lid body with concave ridges, and the concave ridges of the lid body are overlapped onto the convex ridges of the container body and bonded to each other by thermocompression or the like, so that liquids in food stored in the container do not leak to the outside and the container can be stored for long periods of time. Furthermore, the inside of the convex ridges of the container body and the inside of the concave ridges of the lid body are provided with mating parts that can fit into each other, so that even after the lid is removed and the food is used, the mating parts allow the lid to be fitted back into the container body.

However, in the packaging container of Patent Document 1, in order to provide a high level of sealing, the concave ridges of the lid are overlapped with the convex ridges of the container body and are firmly bonded to each other by thermocompression or the like, so a relatively large force is required to remove the lid. Furthermore, the part to which a large force is applied (for example, the outer flange) becomes deformed, making it difficult to refit the lid to the container body, resulting in a problem of reduced resealability.

Patent No. 5041408

In view of the above problems, the present invention provides a packaging container that can be easily removed with a light force and has good resealability.

In order to solve the above problem, the packaging container according to claim 1 of the present invention is a packaging container comprising a container body having a convex rib and a lid having a concave rib, and the concave rib of the lid is overlapped and bonded to the convex rib of the container body, the container body has a container side fitting step that protrudes outward from the convex rib and is located lower than the convex rib, the lid has a lid side fitting step that protrudes outward from the concave rib and is located lower than the concave rib, the container side fitting step and the lid side fitting step are not bonded to each other and can be fitted to each other, and the upper wall of the convex rib is a flat surface and is overlapped and bonded to the concave rib.

According to the above-mentioned features, when the lid is pulled up and removed, first the lid-side fitting step and the container-side fitting step are disengaged, and then the bond between the concave and convex strips can be pulled apart with a light force by the principle of leverage (type 2). As a result, even if the packaging container has high sealing performance due to the bond between the concave and convex strips, the lid can be removed with a light force. In addition, since the lid can be removed with a light force, deformation of the outer edge of the packaging container due to the force applied when the lid is removed can be prevented, and the resealability of the packaging container is improved. Furthermore, since the lid-side fitting step and the container-side fitting step are located at a lower position than the concave and convex strips, the outside of the concave and convex strips is stepped, which increases the strength and makes it less likely to deform, effectively preventing deformation of the outer edge of the packaging container due to the force applied when the lid is removed, and improving the resealability of the packaging container.

Furthermore, the packaging container according to claim 2 of the present invention is characterized in that the container-side fitting step has a flat container-side gripping portion on the outside, and the lid-side fitting step has a flat lid-side gripping portion on the outside.

The above features make it easy to remove the lid from the container body by pinching the lid-side gripping portion and the container-side gripping portion with your fingers.

Furthermore, the packaging container of claim 1 of the present invention is characterized in that the container side fitting step has a container side fitting portion on the outer wall that is recessed inward in a planar view, and the lid side fitting step has a lid side fitting portion on the outer wall that is recessed inward in a planar view , and the container side fitting portion and the lid side fitting portion fit together.

The above feature allows the lid-side mating step and the container-side mating step to fit together more securely, further improving the resealability of the packaging container.

Furthermore, the packaging container of claim 3 of the present invention is characterized in that the packaging container has a polygonal shape when viewed in a plane, and the container side mating step and the lid side mating step are provided in at least one corner of the packaging container.

According to the above features, the force applied when removing the lid is concentrated on the corners of the packaging container, which is polygonal in plan view, making it easier to remove the lid. In addition, when the lid is reattached, the lid-side mating step and the container-side mating step fit securely together at the corners of the packaging container, providing good sealing of the packaging container.

The packaging container of the present invention allows the lid to be removed with little force and has good resealability.

1A is a plan view of a lid of a packaging container according to the present invention, FIG. 1B is a side view of the lid, and FIG. 1C is an end view taken along the line AA. 1A is a plan view of a container body of a packaging container according to the present invention, FIG. 1B is a side view of the container body, and FIG. FIG. 2A is a plan view of the packaging container of the present invention, FIG. 2B is a side view of the packaging container, and FIG. 2C is a CC end view. 1A is an enlarged plan view of the area around the lid-side mating step when opening the packaging container of the present invention, and FIG. 1B is an enlarged side view of the area around the lid-side mating step of the packaging container. FIG. 4( a ) is a DD end view.

100 Lid 150 Concave strip 160 Lid side fitting step 200 Container body 250 Convex strip 260 Container side fitting step 300 Packaging container

Below, an embodiment of the present invention will be described with reference to the drawings. In this specification, "upward" refers to the upward direction in the vertical direction when the container body of the packaging container is placed on a horizontal surface with the opening side facing up, and "downward" refers to the downward direction in the vertical direction.

First, FIG. 1 shows the lid 100 of the present invention. FIG. 1(a) is a plan view of the lid 100, FIG. 1(b) is a side view of the lid 100, and FIG. 1(c) is an A-A end view.

As shown in FIG. 1, the lid 100 has a generally rectangular shape in plan view with four corners 110, a flat top plate 120, a side wall 130 that continues upward from an edge 121 of the top plate 120, a flat upper surface 140 that extends outward from the side wall 130, and a concave streak 150 that protrudes upward from the upper surface 140. The side wall 130, the upper surface 140, and the concave streak 150 are provided continuously or intermittently around the entire circumference of the lid 100. Although the lid 100 has a generally rectangular shape in plan view, this is not limited thereto, and it can have any shape, such as a generally polygonal shape in plan view, a generally circular shape in plan view, or a generally elliptical shape in plan view.

The concave rib 150 is formed by the opposing inner wall 151 and outer wall 152 and the upper wall 153 connecting the inner wall 151 and the outer wall 152, and is formed in a convex shape upward, with its inside being concave. The convex rib of the container body described later is overlapped on the inside of the concave rib 150, i.e., on the groove 154 surrounded by the inner wall 151, the outer wall 152, and the upper wall 153, and the two are bonded together. The concave rib 150 extends in an annular shape around the circumferential direction of the lid body 100, and is configured to overlap the annular convex rib of the container body described later over the entire circumference. The concave rib 150 is formed in an annular shape continuously around the circumferential direction of the lid body 100, but is not limited to this, and may be formed partially around the circumferential direction of the lid body 100.

The corner 110 also has a lid-side fitting step 160 that protrudes outward from the groove 150 and is provided at a lower position below the groove 150. Specifically, the lid-side fitting step 160 is provided at a lower position than the upper wall 153 of the groove 150 and has a flat upper wall 161 extending outward and an outer wall 162 extending downward from the upper wall 161. Since the lid-side fitting step 160 protrudes outward, the inner side 164 of the lid-side fitting step 160 is recessed to the side and is concave, so that the container-side fitting step of the container body, which will be described later, can be fitted inside. Furthermore, the approximate center of the outer wall 162 is a lid-side fitting part 163 that is recessed inward, so that it can be fitted with a container-side fitting part provided in the container-side fitting step of the container body, which will be described later. The lid-side fitting step 160 also has a flat lid-side gripping portion 170 that extends outward from the lower end of the outer wall 162.

The lid side fitting step 160 has a shape including an upper wall 161 and an outer wall 162, so that the strength of the lid side fitting step 160 itself is strong and difficult to deform. The lid side fitting step 160 has a shape like two mountains lined up in a plan view, but is not limited to this, and may have any shape as long as it protrudes outward from the groove 150 and is located at a lower position than the groove 150 and can fit the container side fitting step of the container body described later. The lid side fitting step 160 is provided at all four corners 110 of the lid 100, but is not limited to this, and the lid side fitting step 160 may be provided at at least one corner 110. The lid side fitting step 160 is provided at the corner 110, but is not limited to this, and may be provided at any point on the outer edge of the lid 100.

Next, FIG. 2 shows the container body 200 that is covered by the lid 100 of the present invention. Note that FIG. 2(a) is a plan view of the container body 200, FIG. 2(b) is a side view of the container body 200, and FIG. 2(c) is a B-B end view.

As shown in FIG. 2, the container body 200 is a shallow dish type that opens upward, has a generally rectangular shape in plan view with four corners 210, and includes a flat bottom wall 220, a side wall 230 that is formed to rise from an edge 221 of the bottom wall 220, a flat top surface 240 that extends outward from the side wall 230, and a convex rib 250 that protrudes upward from the top surface 240. The side wall 230, top surface 240, and convex rib 250 are provided continuously or intermittently around the entire circumference of the container body 200 in the circumferential direction. Note that the container body 200 is generally rectangular in plan view, but is not limited thereto, and can be any shape, such as a generally polygonal shape in plan view, a generally circular shape in plan view, or a generally elliptical shape in plan view.

The ridge 250 is formed in an upwardly convex shape by the opposing inner wall 251 and outer wall 252, and the upper wall 253 connecting the inner wall 251 and the outer wall 252. When the lid 100 is attached to the container body 200, the ridge 250 is inserted into the groove 154 of the concave ridge 150 of the lid 100, and the ridge 250 and the concave ridge 150 overlap each other vertically and are bonded to each other. The ridge 250 extends in an annular shape around the circumferential direction of the container body 200, and is configured to overlap the concave ridge 150 of the lid 100 over the entire circumference. The ridge 250 is formed in an annular shape continuously around the circumferential direction of the container body 200, but is not limited to this and may be formed partially around the circumferential direction of the container body 200.

The corner portion 210 also has a container-side fitting step 260 that protrudes outward from the protruding strip 250 and is provided at a lower position below the protruding strip 250. Specifically, the container-side fitting step 260 is provided at a lower position than the upper wall 253 of the protruding strip 250 and has a flat upper wall 261 extending outward and an outer wall 262 extending downward from the upper wall 261. Since the container-side fitting step 260 protrudes outward, when the lid body 100 is attached to the container body 200, it can be fitted into the inner side 164 of the lid body side fitting step 160 of the lid body 100. Furthermore, the approximate center of the outer wall 262 is a container-side fitting portion 263 that is recessed inward, and when the lid body 100 is attached to the container body 200, it can be fitted into the lid body side fitting portion 163 of the lid body side fitting step 160. In addition, the container side fitting step 260 has a flat container side gripping portion 270 that extends outward from the lower end of the outer wall 262.

In addition, since the container side fitting step 260 has a shape including an upper wall 261 and an outer wall 262, the container side fitting step 260 itself is strong and does not easily deform. In addition, the container side fitting step 260 has a shape like two mountains lined up in a plan view, but is not limited to this, and may have any shape as long as it protrudes outside the convex rib 250, is located at a position lower than the convex rib 250, and can fit with the lid body side fitting step 160 of the lid body 100. In addition, the container side fitting step 260 is provided at all four corners 210 of the container body 200, but is not limited to this, and the container side fitting step 260 may be provided at at least one corner 210. In addition, the container side fitting step 260 is provided at the corner 210, but is not limited to this, and may be provided at any point on the outer edge of the container body 200.

The lid 100 and the container body 200 are formed by sheet molding (e.g., vacuum molding, pressure molding, hot plate molding) using a sheet-like material with a thickness of approximately 0.1 mm to 1.00 mm. For example, the lid 100 and the container body 200 can be made of polystyrene, polypropylene, polystyrene, A-PET, polylactic acid, or biaxially stretched versions of these.

Next, a packaging container 300 in which the lid 100 of the present invention is attached to the container body 200 will be described with reference to Figure 3. Figure 3(a) is a plan view of the packaging container 300, Figure 3(b) is a side view of the packaging container 300, and Figure 3(c) is a C-C end view.

As shown in FIG. 3, the lid 100 is placed over the container body 200, and the concave strips 150 of the lid 100 are bonded to the convex strips 250 of the container body 200 over the entire circumference of the packaging container 300, sealing the packaging container 300. Specifically, a thermoplastic adhesive or a thermosetting adhesive sheet is interposed between the flat surface of the upper wall 253 of the convex strips 250 of the container body 200 and the flat back surface of the upper wall 153 of the concave strips 150 of the lid 100, so that the concave strips 150 are superimposed on the convex strips 250. Furthermore, the upper wall 153 of the concave strips 150 is pressed downward from above the lid 100 with a flat heating plate or the like, and the upper wall 153 of the concave strips 150 and the upper wall 253 of the convex strips 250 are thermally compressed to seal them. As a result, the concave ribs 150 of the lid 100 are firmly attached to the convex ribs 250 of the container body 200, providing the packaging container 300 with high sealing properties. This prevents the liquid contents contained in the container body 200 from leaking out and prevents foreign matter from entering the packaging container 300 from the outside.

Note that a thermoplastic adhesive or a thermosetting adhesive sheet is interposed between the surface of the upper wall 253 of the convex rib 250 and the back surface of the upper wall 153 of the concave rib 150, but this is not limited to this. For example, a thermoplastic adhesive or a thermosetting adhesive sheet may be interposed between the outer wall 152 of the concave rib 150 and the outer wall 252 of the convex rib 250. As long as the concave rib 150 and the convex rib 250 can be bonded, a thermoplastic adhesive or a thermosetting adhesive sheet may be interposed at any location on the concave rib 150 and the convex rib 250.

In addition, the lid body side fitting step 160 of the lid body 100 fits into the container side fitting step 260 of the container body 200, so that it is possible to prevent fingers or the like from accidentally getting between the concave rib 150 and the convex rib 250, which would inadvertently cause the adhesion between the concave rib 150 and the convex rib 250 to be peeled off. Furthermore, the lid body side fitting portion 163 of the lid body side fitting step 160 and the container side fitting portion 263 of the container side fitting step 260 fit into each other, so the fit between the lid body side fitting step 160 and the container side fitting step 260 is stronger.

The lid side fitting step 160 is located at a lower position than the concave rib 150, and the container side fitting step 260 is also located at a lower position than the convex rib 250. Therefore, when the convex rib 250 of the container body 200 and the concave rib 150 of the lid 100 are thermally pressed together with a thermoplastic adhesive or a thermosetting adhesive sheet or the like interposed between them, the lid side fitting step 160 and the container side fitting step 260, which are one step lower than the concave rib 150 and the convex rib 250, are less susceptible to the effects of heat, and the lid side fitting step 160 and the container side fitting step 260 can easily be maintained in a state where they are not adhered to each other. In particular, when a thermoplastic adhesive or a thermosetting adhesive sheet, etc. is interposed between the surface of the upper wall 253 of the convex rib 250 and the back surface of the upper wall 153 of the concave rib 150, and the upper wall 153 of the concave rib 150 is pressed downward from above the lid body 100 with a flat heating plate, etc., and the upper wall 153 of the concave rib 150 and the upper wall 253 of the convex rib 250 are heat-pressed to seal them, the flat heating plate does not come into contact with the lid body side fitting step 160 and the container side fitting step 260, which are one step lower than the concave rib 150 and the convex rib 250, so that the lid body side fitting step 160 and the container side fitting step 260 are less affected by the heat-pressure bonding, and the lid body side fitting step 160 and the container side fitting step 260 can easily be maintained in a state where they are not adhered to each other. Although the concave ribs 150 and the convex ribs 250 are bonded to each other by thermocompression, this is not limited thereto, and any other method may be used as long as the concave ribs 150 and the convex ribs 250 can be bonded to each other, such as using an adhesive that can bond the concave ribs 150 and the convex ribs 250 to each other at room temperature.

Next, a method for opening the sealed packaging container 300 will be described with reference to Figures 4 and 5. Figure 4(a) is an enlarged plan view of the periphery of the lid-side fitting step 160 when opening the packaging container 300, Figure 4(b) is an enlarged side view of the periphery of the lid-side fitting step 160 of the packaging container 300, and Figure 5 is a D-D end view of Figure 4(a).

As shown in Figures 4 and 5, when removing and opening the lid body 100 of the packaging container 300, for example, the lid body side gripping portion 170 of the lid body 100 is pinched with the index finger F1 and thumb F2 of one hand, and the container side gripping portion 270 of the container body 200 is pinched with the thumb F3 and index finger F4 of the other hand, and the lid body side gripping portion 170 of the lid body 100 is pulled upward. At this time, although the flat lid body side gripping portion 170 of the lid body 100 is deformed so as to bend upward, the stepped lid body side fitting step 160 is not easily deformed. Similarly, although the flat container side gripping portion 270 of the container body 200 is deformed so as to bend downward, the stepped container side fitting step 260 is not easily deformed.

Then, when the lid side gripping portion 170 of the lid body 100 is pulled upward, the lid side fitting step 160 is also lifted upward. At this time, the lid side fitting step 160 is fitted into the container side fitting step 260, but is not bonded, so the fitting between the lid side fitting step 160 and the container side fitting step 260 is easily released. Furthermore, the upward force applied to the lid side gripping portion 170 of the lid body 100 is transmitted firmly and efficiently to the concave rib 150 because the lid side fitting step 160 is not easily deformed. Also, when removing the lid body 100, the container side gripping portion 270 is pinched with fingers to hold the container body 200 so that it does not move, but because the container side fitting step 260 is not easily deformed, the container side fitting step 260 and the adjacent convex rib 250 are also not easily deformed, and the lid body 100 can be easily removed.

Then, when the lid-side gripping portion 170 of the lid 100 is subsequently pulled upward, the concave streak 150 adjacent to the lid-side fitting step 160 is peeled off from the convex streak 250 of the container body 200. At this time, as shown in Figures 4 and 5, the principle of leverage (type 2) is at work, so the concave streak 150 can be easily peeled off from the convex streak 250 with a light force. Specifically, when the lid 100 is pulled upward, the part where the force is most directly applied, that is, the vicinity of the outer end of the lid-side fitting step 160, becomes the force point P1. Then, the part where the concave streak 150 begins to be peeled off from the convex streak 250, that is, the vicinity of the outer end of the concave streak 150 adjacent to the lid-side fitting step 160, becomes the load point (point of action) P2. Furthermore, the end of the part where the concave strip 150 is peeled off from the convex strip 250, i.e., the vicinity of the inner end of the concave strip 150 farthest from the lid-side fitting step 160, becomes the fulcrum P3. Then, due to the principle of leverage (type 2), the upward force G1 applied at the force point P1 becomes an upward force G2 greater than the force G1 at the load point P2. This upward force G2 causes the concave strip 150 to gradually peel off from the convex strip 250 from the outer load point P2 side to the inner fulcrum P3. As a result, the concave strip 150 of the lid 100 can be easily peeled off from the convex strip 250 with a light force.

On the other hand, when the lid body 100 is removed from the container body 200 to open the packaging container 300, and then the container body 200 is closed again with the lid body 100 to reseal the packaging container 300, the lid body 100 is placed over the container body 200, and the concave ridges 150 of the lid body 100 and the convex ridges 250 of the container body 200 overlap over the entire circumference of the packaging container 300. At that time, even if the concave ridges 150 of the lid body 100 and the convex ridges 250 of the container body 200 are not glued together, the lid body side fitting step 160 of the lid body 100 and the container side fitting step 260 of the container body 200 are firmly fitted together, so that the lid body 100 will not come off accidentally and the packaging container 300 can be resealed.

In this way, the packaging container 300 of the present invention has a lid-side fitting step 160 and a container-side fitting step 260 that protrude outward from the mutually bonded concave ribs 150 and convex ribs 250, and the lid-side fitting step 160 and the container-side fitting step 260 are not bonded to each other and can be fitted to each other. Therefore, when the lid 100 is pulled up and removed, the lid-side fitting step 160 and the container-side fitting step 260 are first disengaged, and then, by the principle of leverage (type 2), the adhesion between the concave ribs 150 and the convex ribs 250 adjacent to the lid-side fitting step 160 and the container-side fitting step 260 can be pulled apart with a light force. As a result, even though the packaging container 300 has a high sealing performance due to the adhesion between the concave ribs 150 and the convex ribs 250, the lid 100 can be removed with a light force. In addition, because the lid 100 can be removed with a light force, it is possible to prevent the outer edge of the packaging container 300 (for example, the recessed ribs 150 and the protruding ribs 250, and the areas around the lid side fitting step 160 and the container side fitting step 260) from being deformed by the force applied when the lid 100 is removed, improving the resealability of the packaging container 300.

Furthermore, as shown in FIG. 5, the lid body side fitting step 160 and the container side fitting step 260 are provided at a lower position than the concave rib 150 and the convex rib 250, so that the outside of the concave rib 150 and the convex rib 250 is stepped, which increases the strength and makes it difficult to deform. Therefore, it is possible to effectively prevent the outer edge of the packaging container 300 (the concave rib 150 and the convex rib 250, and the periphery of the lid body side fitting step 160 and the container side fitting step 260) from being deformed by the force when the lid body 100 is removed, and the resealability of the packaging container 300 is improved. In addition, since the lid body side fitting step 160 and the container side fitting step 260 are difficult to deform, they are the parts to which the force is most directly applied when the lid body 100 is pulled upward, so the vicinity of the outer end of the lid body side fitting step 160 is likely to act as the force point P1 in the principle of leverage (type 2).

When the convex rib 250 of the container body 200 and the concave rib 150 of the lid 100 are thermally pressed together with a thermoplastic adhesive or a thermosetting adhesive sheet interposed therebetween, the lid side mating step 160 and the container side mating step 260, which are one step lower than the concave rib 150 and the convex rib 250, are less susceptible to the effects of heat, and the lid side mating step 160 and the container side mating step 260 can easily be maintained in a state where they are not adhered to each other.

The lid-side fitting step 160 has a flat lid-side gripping portion 170 on the outside, and the container-side fitting step 260 has a flat container-side gripping portion 270 on the outside, so that the lid 100 can be easily removed from the container body 200 by pinching the lid-side gripping portion 170 and the container-side gripping portion 270 with fingers. The lid-side gripping portion 170 is provided at each corner 110 of the lid 100, and the container-side gripping portion 270 is provided at each corner 210 of the container body 200, but this is not limited thereto, and at least one lid-side gripping portion 170 may be provided at any position on the outer edge of the lid 100, and at least one container-side gripping portion 270 may be provided at any position on the outer edge of the container body 200.

In addition, the lid side fitting step 160 has a lid side fitting portion 163 recessed inward on the outer wall 162, and the container side fitting step 260 has a container side fitting portion 263 recessed inward on the outer wall 262, so that the lid side fitting step 160 and the container side fitting step 260 can be more firmly fitted together, which further improves the resealability of the packaging container 300. In addition, as shown in FIG. 4(a), since the lid side fitting portion 163 and the container side fitting portion 263 are recessed inward, when removing the lid body 100, part of a finger (e.g., index finger F1) can be placed in the recessed portion, making it easier to pinch the outer edge of the lid body 100 and apply force, making it even easier to remove the lid body 100.

Note that the lid side fitting portion 163 is formed on the lid side fitting step 160, and the container side fitting portion 263 is formed on the container side fitting step 260, but this is not limited thereto. As long as the lid side fitting portion 163 and the container side fitting portion 263 can be fitted together, the lid side fitting portion 163 may be provided at any location on the outer edge of the lid body 100, and the container side fitting portion 263 may also be provided at any location on the outer edge of the container body 200, thereby improving the resealability of the packaging container 300.

The packaging container 300 has a polygonal shape in plan view, and the lid-side fitting step 160 and the container-side fitting step 260 are provided at at least one corner of the packaging container 300 (specifically, corners 110 and 210). This allows the force applied when removing the lid 100 to be concentrated at the corners of the packaging container 300, which has a polygonal shape in plan view, making it easier to remove the lid 100. When the lid 100 is reattached, the lid-side fitting step 160 and the container-side fitting step 260 fit tightly together at the corners of the packaging container 300, providing good sealing of the packaging container 300.

The packaging container of the present invention is not limited to the above examples, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of the rights.

Claims (3)

The container has a container body with a convex strip and a lid body with a concave strip,
A packaging container in which the convex strips of the container body are overlapped with the concave strips of the lid body and bonded to each other,
The container body includes a container-side fitting step portion that protrudes outward from the protrusion and is provided at a position lower than the protrusion,
The lid includes a lid-side fitting step portion that protrudes outward from the recessed strip and is provided at a position lower than the recessed strip,
The container-side fitting step and the lid-side fitting step are not bonded to each other and can be fitted to each other,
The upper wall of the convex strip is a flat surface, and is overlapped and bonded to the concave strip;
The container-side fitting step includes a container-side fitting portion on an outer wall, the container-side fitting portion being recessed inward in a plan view,
A packaging container characterized in that the lid side fitting step has a lid side fitting portion on its outer wall that is recessed inward when viewed in a plane, and the container side fitting portion and the lid side fitting portion fit together . The container-side fitting step has a flat container-side gripping portion on an outer side,
2. The packaging container according to claim 1, wherein the lid-side fitting step has a flat lid-side gripping portion on an outer side. The packaging container has a polygonal shape in a plan view,
3. The packaging container according to claim 1, wherein the container-side fitting step and the lid-side fitting step are provided in at least one corner of the packaging container.

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