Lid body

Abstract

To provide a lid body of a packaging container, which can maintain high visibility of a stored article while having a strength to endure stacked displaying.SOLUTION: A lid body (1) of a packaging container (100) comprises: a flat top part (10) of a polygonal shape in plan view; a flat side wall (20) that extends downward from each side of the top part (10); and a flange (30) that extends outward from the side wall (20). A chamfer part (60) formed into a chamfered shape is provided in a connection part of the adjacent side walls (20). The chamfer part (60) includes an upper chamfer part (62) of a reverse trapezoidal shape connected to the top part (10), and a lower chamfer part (64) of a regular trapezoidal shape connected to the flange (30). The upper and lower chamfer parts (62 and 64) are connected to each other at short sides.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lid for a packaging container. [Background technology]

[0002] Packaging containers are used to package foods such as boxed lunches and side dishes. Packaging containers often include a container body and a lid that fits thereto, and are formed by sheet molding. An example of such a packaging container is disclosed in Japanese Patent Laid-Open Publication No. 2012-30887 (Patent Document 1).

[0003] The lid (lid 10) of Patent Document 1 has a top surface (top plate 11) that is rectangular in plan view, a side wall (side wall 12) that extends downward from the top surface, and a flange (flange 14) that extends outward from the side wall. This lid has a number of ribs (first rib recesses 20) on the side wall to ensure strength when packaging containers are stacked in multiple layers for display. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-30887 Summary of the Invention [Problem to be solved by the invention]

[0005] However, while providing a large number of ribs on the side wall increases the strength of the packaging container, another problem arises in that the visibility of the contents contained therein from the side is reduced.

[0006] There is a demand for a lid for a packaging container that is strong enough to withstand stacking and display, while still maintaining good visibility of the contents contained therein. [Means for solving the problem]

[0007] The lid body according to the present invention is A lid for a packaging container formed by sheet molding, The container has a flat top surface that is polygonal in plan view, flat sidewalls that extend downward from each side of the top surface, and flanges that extend outward from the sidewalls, A chamfered portion formed in a chamfered shape is provided at a connecting portion between adjacent side wall portions, the chamfered portion includes an upper chamfered portion continuing from the top surface portion and a lower chamfered portion continuing from the flange portion, The upper chamfered portion has an inverted trapezoidal shape with the lower base being shorter than the upper base, and the lower chamfered portion has a regular trapezoidal shape with the upper base being shorter than the lower base, and the upper chamfered portion and the lower chamfered portion are connected at their respective short sides.

[0008] With this configuration, both the top and side walls are flat, creating a glass-like appearance, ensuring good visibility of the contents from all directions, including above and the sides, of the lid. Furthermore, chamfered portions are provided at the joints between adjacent side walls, and these chamfered portions are composed of a regular trapezoidal lower chamfered portion and an inverted trapezoidal upper chamfered portion connected by their short sides, thereby enhancing the strength of the structure, similar to a truss structure. This ensures sufficient strength for stacked display. These features make it possible to provide a lid for a packaging container that is strong enough to withstand stacked display while maintaining good visibility of the contents.

[0009] Preferred embodiments of the present invention will be described below, but the scope of the present invention is not limited to the preferred embodiments described below.

[0010] In one embodiment, At least one of the upper chamfered portion and the lower chamfered portion preferably has a protruding portion that is convex inward or outward.

[0011] According to this configuration, the upper chamfered portion, the lower chamfered portion, or both of them have protrusions, which provides a kind of lens effect or an effect similar thereto, thereby improving the design.

[0012] In one embodiment, It is preferable that both the upper chamfered portion and the lower chamfered portion have the protrusion, and that the protrusion on the upper chamfered portion and the protrusion on the lower chamfered portion are convex in opposite directions.

[0013] With this configuration, the protruding portions of the upper and lower chamfered portions are convex in opposite directions, creating a unique aesthetic and further enhancing the design.

[0014] In one embodiment, It is preferable that the lower base of the lower chamfered portion be formed in an arc shape that is convex outward in a plan view.

[0015] With this configuration, the boundary portion between the flange portion at the connection point between adjacent side wall portions is rounded, so that the force applied to that portion can be dispersed and absorbed, further increasing the strength against external forces.

[0016] In one embodiment, It is preferable that the lower base of the lower chamfered portion and the flange portion are connected via a groove portion recessed downward.

[0017] With this configuration, the groove portion formed in a position that does not affect the visibility of the contents is integrated with the lower chamfered portion while functioning as a type of rib, further increasing strength against external forces.

[0018] In one embodiment, Further, the grip portion is formed of a protruding piece that protrudes outward from the flange portion, It is preferable that the knob portion is provided on an extension line connecting the upper chamfered portion and the lower chamfered portion.

[0019] With this configuration, the gripping portion is provided integrally with the upper and lower chamfered portions, so that the force acting on the gripping portion is easily transmitted to the entire top and side walls via the flange and the lower and upper chamfered portions, making it easier to remove the lid from the packaging container.

[0020] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which is given with reference to the drawings. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is an exploded perspective view of a packaging container according to an embodiment. [Figure 2] Exploded front view of packaging container [Figure 3] Plan view of the container body [Figure 4] Plan view of the lid [Figure 5] Enlarged view of part of Figure 4 [Figure 6] VI-VI cross section in Figure 5 [Figure 7] Cross section taken along the line VII-VII in Figure 5 [Figure 8] Cross section VIII-VIII in Figure 2 [Figure 9] Cross-sectional view of a cover body according to another embodiment [Figure 10] Cross-sectional view of a cover body according to another embodiment DETAILED DESCRIPTION OF THE INVENTION

[0022] An embodiment of the lid will be described with reference to the drawings. In this embodiment, the lid 1 used for a packaging container (food packaging container) 100 that contains food such as sushi and side dishes as contained items will be described as an example.

[0023] In the following, the direction toward the inside of the packaging container 100 (from the outer edge toward the center) will be referred to as "inward," and the direction toward the outside of the packaging container 100 (from the center toward the outer edge) will be referred to as "outward."

[0024] 1 and 2, the packaging container 100 includes a lid 1 and a container body 9 to which the lid 1 is fitted. The packaging container 100 is formed by sheet molding. The lid 1 and the container body 9 that constitute the packaging container 100 are each formed by sheet molding.

[0025] The lid 1 is formed by thermoforming a non-foamed thermoplastic resin sheet. There are no particular limitations on the thermoplastic resin that constitutes the lid 1. For example, general thermoplastic resins such as polyolefins (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyesters (polyethylene terephthalate, etc.), and acrylic resins 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 lid 1 is formed to be colorless and transparent.

[0026] The container body 9 is formed by thermoforming a thermoplastic resin foam sheet or a thermoplastic resin non-foam sheet. The thermoplastic resin constituting the container body 9 is not particularly limited. Any of the various thermoplastic resins exemplified as constituent materials of the lid 1 can be used as appropriate. The container body 9 may be formed to be colored or colorless and transparent.

[0027] The packaging container 100 is formed to have a polygonal shape in a plan view. "Polygonal shape in a plan view" means that the external shape in a plan view is polygonal or is approximately polygonal as a whole. Therefore, as long as the external shape in a plan view is approximately polygonal as a whole, at least one of the sides of the lid body 1 and the container body 9 may be formed to be bent or curved. Furthermore, at least one of the vertices may be formed to be rounded or rounded, or may be formed to protrude outward.

[0028] As shown in Figures 3 and 4, the packaging container 100 of this embodiment is formed in a rectangular shape when viewed from above. The lid body 1 and container body 9 constituting the packaging container 100 are each formed in a rectangular shape when viewed from above. Furthermore, in this embodiment, the packaging container 100 (lid body 1 and container body 9) is formed in a rectangular shape when viewed from above, having a pair of long sides and a pair of short sides. The lid body 1 is formed in a rectangular shape when viewed from above, with all four corners slightly protruding outward. The container body 9 is formed in a rectangular shape when viewed from above, with all four corners being rounded.

[0029] As shown in Figures 1 to 3, the container body 9 has a bottom portion 91, a body side wall portion 92, a body flange portion 93, a hanging wall 94, a body engagement portion 95, a body skirt portion 96, and an extended edge portion 97.

[0030] Bottom surface portion 91 constitutes the bottom of container body 9. Bottom surface portion 91 is formed in a rectangular shape in a plan view. Bottom surface portion 91 serves as a placing portion on which food, which is the object to be contained, is placed. Bottom surface portion 91 may be formed with linear convex portions or linear concave portions that serve as markers when placing the object to be contained, or with groove portions for capturing moisture seeping out from the object to be contained.

[0031] The main body side wall portions 92 are formed to extend upward from each side of the bottom surface portion 91. The multiple main body side wall portions 92 are connected to each other in the circumferential direction to form a peripheral wall that as a whole surrounds the bottom surface portion 91. The main body side wall portions 92 are formed to slope outward as they extend upward. The central portion of each main body side wall portion 92 forms a gently sloping wall 92A that is less sloping than the portions located on either side of it.

[0032] The body flange 93 extends outward from the body side wall 92. The body flange 93 extends horizontally outward from the upper end of the body side wall 92. In the closed state, the lid flange 30 of the lid 1 is placed on the body flange 93.

[0033] The hanging wall 94 extends downward on the peripheral side of the body flange portion 93. Specifically, the hanging wall 94 extends downward from the outer end of the body flange portion 93. The hanging wall 94 is formed around the entire periphery of the container body 9. The hanging wall 94 is covered from the outside by the lid skirt portion 40 of the lid 1 in the closed state.

[0034] The body engaging portion 95 is provided on the hanging wall 94. As shown in Fig. 6, in this embodiment, the body engaging portion 95 is formed as a recessed groove recessed inward. The recessed groove constituting the body engaging portion 95 is formed continuously around the entire circumference of the container body 9. In the closed state, the body engaging portion 95 engages with the lid engaging portion 46 formed on the lid skirt portion 40 of the lid 1.

[0035] The main body skirt portion 96 extends downward on the peripheral side of the hanging wall 94. Specifically, the main body skirt portion 96 spreads outward slightly from the lower end of the hanging wall 94, and then extends at an outward angle as it extends downward. The vertical length of the main body skirt portion 96 is longer than the vertical length of the main body side wall portion 92. As a result, the container body 9 of this embodiment is formed with a raised bottom. The portions of the main body skirt portion 96 located at the four corners form gently sloping surface portions 96A that are gentler in slope than the other portions (side portions).

[0036] The extended edge 97 extends outward from the main body skirt portion 96. The extended edge 97 extends slightly outward from the lower end of the main body skirt portion 96. The extended edge 97 serves as a contact point when the container body 9 is placed on a display stand or table.

[0037] As shown in Figures 1, 2, 4, and 5, the lid body 1 has a top surface portion 10, a lid body side wall portion 20, a lid body flange portion 30, a lid body skirt portion 40, a lid body engagement portion 46, an extended edge portion 48, and a knob portion 50.

[0038] The top surface 10 forms the ceiling of the lid 1. The top surface 10 is formed in a rectangular shape when viewed from above. The top surface 10 is also formed as a flat surface. The lid 1 is formed to be colorless and transparent, and the top surface 10 is formed as a flat surface, which allows for good visibility of the contents from above.

[0039] The lid side wall portions 20 are formed to extend downward from each side of the top surface portion 10. The multiple lid side wall portions 20 are connected to each other in the circumferential direction to form a peripheral wall that surrounds the top surface portion 10 as a whole. The lid side wall portions 20 are formed as a flat surface as a whole. The lid side wall portions 20 are formed to slope outward as they extend downward. In this embodiment, the lid side wall portions 20 correspond to the "side wall portions." The lid side wall portions 20 in this embodiment have an upper inclined wall 22 and a lower inclined wall 24 connected below the upper inclined wall 22. The upper inclined wall 22 is formed to be continuous with the top surface portion 10. The lower inclined wall 24 is formed to be continuous with the lid flange portion 30.

[0040] The upper inclined wall 22 and the lower inclined wall 24 are each formed on a flat surface. The upper inclined wall 22 and the lower inclined wall 24 are each formed so as to slope outward as they extend downward. As shown in FIG. 6, the upper inclined wall 22 is a steeply inclined wall that slopes nearly vertically. The lower inclined wall 24 is formed with a gentler slope than the upper inclined wall 22, and is a gently inclined wall. The difference in the inclination angle between the upper inclined wall 22 and the lower inclined wall 24 is slight, and the angle they form is approximately 160° to 180°.

[0041] In this embodiment, with regard to the configuration of the lid side wall 20, an arrangement in which the upper inclined wall 22 and the lower inclined wall 24, each formed on a flat surface, are connected at an angle close to 180° is also considered to be a flat surface overall. The lid 1 is formed to be colorless and transparent, and the lid side wall 20 is formed on a flat surface overall, which also improves visibility of the contents from the side.

[0042] Furthermore, the lower inclined wall 24 is formed to be wider in the vertical direction than the upper inclined wall 22. In this embodiment, the vertical width of the lower inclined wall 24 is approximately three to six times the vertical width of the upper inclined wall 22.

[0043] The lid flange portion 30 extends outward from the lid side wall portion 20. The lid flange portion 30 extends horizontally outward from the lower end of the lid side wall portion 20 (the lower end of the lower inclined wall 24). In this embodiment, the lid flange portion 30 corresponds to the "flange portion." In this embodiment, the lid flange portion 30 is connected to the lid side wall portion 20 (the lower inclined wall 24) via a circumferential groove portion 36 that is recessed downward. The circumferential groove portion 36 is formed so as to be continuous around the entire periphery. The circumferential groove portion 36 has a narrow groove portion 36A made of a small groove and a deep groove portion 36B that is deeper than the narrow groove portion 36A. The narrow groove portion 36A is provided in an L-shape with rounded corners. The deep groove portion 36B is provided in a linear manner in the center of each side. The deep groove 36B is placed over the top of the gently sloping wall 92A of the main body side wall 92 when the lid 1 is fitted to the container main body 9 and the top opening is closed (lid closed state) (see FIG. 6).

[0044] The lid skirt portion 40 extends downward on the peripheral side of the lid flange portion 30. Specifically, the lid skirt portion 40 extends downward from the outer edge of the lid flange portion 30. The lid skirt portion 40 is formed around the entire periphery of the lid 1. The lid skirt portion 40 covers the hanging wall 94 of the container body 9 from the outside when the lid is closed.

[0045] The lid engaging portion 46 is provided on the lid skirt portion 40. As shown in FIG. 6, in this embodiment, the lid engaging portion 46 is formed as a linear protrusion that protrudes inward. The linear protrusions that make up the lid engaging portion 46 are formed intermittently in the circumferential direction. Specifically, the linear protrusions that make up the lid engaging portion 46 are formed independently at the center and both ends of each side, as well as at the four corners. In the closed state, the lid engaging portion 46 engages from the outside with a body engaging portion 95 formed on the hanging wall 94 of the container body 9.

[0046] The recessed groove that constitutes the main body engaging portion 95 and the linear protrusion that constitutes the lid engaging portion 46 each have an inclined surface that slopes inward as it extends downward. The lid engaging portion 46 enters the main body engaging portion 95 from the outside, and the inclined surface of the main body engaging portion 95 and the inclined surface of the lid engaging portion 46 can engage with each other, making it difficult for the lid 1 to come off the container main body 9. For this reason, even if an unintended external force is applied, for example, while the packaging container 100 is being transported, it is easy to maintain the lid in an appropriate closed state.

[0047] The extended edge 48 and the tab 50 are located outside the lid flange 30 and extend outward from the lid skirt 40. The extended edge 48 extends slightly outward from the lower end of each side of the lid skirt 40. In this embodiment, the tab 50 extends outward from the lower end of each of the four corners of the lid skirt 40. The tab 50 is composed of a protruding piece that protrudes outward. The tab 50 has a tab body 52 and a protrusion 54. As shown in FIG. 7 , the tab body 52 is formed in a flat shape and extends outward in a horizontal position. The protrusion 54 is formed in the center of the flat tab body 52 so as to protrude downward.

[0048] As described above, the lid 1 of this embodiment is formed to be colorless and transparent, and the top surface 10 and the lid side wall 20 are formed to be flat, so that it is like a glass-covered surface, so that the contents can be easily seen from above and the sides. However, on the other hand, when the packaging containers 100 containing the contents are stacked in multiple layers for display, there is a possibility that sufficient strength may not be ensured.

[0049] Therefore, in this embodiment, chamfered portions 60 are provided at the joints where adjacent lid side walls 20 are joined. In this embodiment, the lid 1 is formed in a rectangular shape in a plan view, and the joints where adjacent lid side walls 20 are joined are located at the four corners. In other words, the chamfered portions 60 are provided at the four corners where adjacent lid side walls 20 of the lid 1 are joined.

[0050] As shown in Figures 1, 2, 4, 5, and 7, the chamfered portion 60 includes an upper chamfered portion 62 and a lower chamfered portion 64 connected below the upper chamfered portion 62. The upper chamfered portion 62 is formed to continue from the top surface portion 10. The upper chamfered portion 62 is formed at the connection portion where adjacent upper inclined walls 22 are connected. The lower chamfered portion 64 is formed to continue from the cover flange portion 30. The lower chamfered portion 64 is formed at the connection portion where adjacent lower inclined walls 24 are connected. The lower chamfered portion 64 is formed to be vertically longer than the upper chamfered portion 62. In this embodiment, the vertical length of the lower chamfered portion 64 is approximately three to six times the vertical length of the upper chamfered portion 62.

[0051] As clearly shown in FIGS. 1 and 5, the upper chamfered portion 62 and the lower chamfered portion 64 are both trapezoidally shaped. In this embodiment, the upper chamfered portion 62 is shaped like an inverted trapezoid, with the lower base being shorter than the upper base. The inverted trapezoidal upper chamfered portion 62 is connected to the top surface 10 at the upper base, which is its longer side. On the other hand, the lower chamfered portion 64 is shaped like a regular trapezoid, with the upper base being shorter than the lower base. The regular trapezoidal lower chamfered portion 64 is connected to the lid flange portion 30 at the lower base, which is its longer side. The upper chamfered portion 62 and the lower chamfered portion 64 are connected at the lower base, which is the shorter side of the inverted trapezoidal upper chamfered portion 62, and the upper base, which is the shorter side of the regular trapezoidal lower chamfered portion 64.

[0052] In this way, the lid 1 of this embodiment has improved strength by providing a truss-like structure at the four corners, which combines an inverted trapezoidal upper chamfered portion 62 and a regular trapezoidal lower chamfered portion 64. The top surface 10 and the lid side walls 20 are formed into flat surfaces to improve visibility inside, while the reinforcing structure consisting of the upper chamfered portion 62 and the lower chamfered portion 64 is provided at the joint between adjacent lid side walls 20, ensuring strength that can withstand stacking when displayed.

[0053] The lower base of the trapezoidal lower chamfered portion 64 and the lid flange 30 are connected via a circumferential groove 36. In this embodiment, the circumferential groove 36 corresponds to the "groove." More specifically, the lower base of the trapezoidal lower chamfered portion 64 and the lid flange 30 are connected via a rounded, L-shaped narrow groove 36A. As a result, the lower base of the trapezoidal lower chamfered portion 64 is formed in an arc shape that convex outward in a plan view.

[0054] At least one of the upper chamfered portion 62 and the lower chamfered portion 64 that make up the chamfered portion 60 preferably has a protrusion 66 that is convex inward or outward. By having at least one of the upper chamfered portion 62 and the lower chamfered portion 64 have the protrusion 66, a type of lens effect or a similar effect can be obtained, improving the design.

[0055] In this embodiment, as shown in Fig. 7, the upper chamfered portion 62 is formed into a flat surface, and the lower chamfered portion 64 has an inwardly convex protrusion 66. The lower chamfered portion 64 in this embodiment has an inwardly curved surface portion 68 as the protrusion 66, the entire protrusion 66 of which bulges inward (see also Fig. 8).

[0056] As another example, both the upper chamfered portion 62 and the lower chamfered portion 64 may have protrusions 66, with the protrusions 66 of the upper chamfered portion 62 and the lower chamfered portion 64 being convex in opposite directions. For example, as shown in FIG. 9, the upper chamfered portion 62 may have a protrusion 66 that is convex outward (outwardly curved portion 69), and the lower chamfered portion 64 may have a protrusion 66 that is convex inward (inwardly curved portion 68). Alternatively, as shown in FIG. 10, the upper chamfered portion 62 may have a protrusion 66 that is convex inward (inwardly curved portion 68), and the lower chamfered portion 64 may have a protrusion 66 that is convex outward (outwardly curved portion 69). In this configuration, a unique aesthetic can be created by combining different lens effects (or similar effects), further enhancing the design.

[0057] Other than the above, the following combinations of the formation modes of the upper chamfered portion 62 and the lower chamfered portion 64 can also be adopted. For example, the upper chamfered portion 62 may be formed as a flat surface, and the lower chamfered portion 64 may have a protrusion 66 that is convex outward (outwardly curved surface portion 69). Alternatively, the upper chamfered portion 62 may have a protrusion 66 that is convex inward or outward (inwardly curved surface portion 68 or outwardly curved surface portion 69), and the lower chamfered portion 64 may be formed as a flat surface.

[0058] Alternatively, when both the upper chamfered portion 62 and the lower chamfered portion 64 have the protrusion 66, the protrusion 66 of the upper chamfered portion 62 and the protrusion 66 of the lower chamfered portion 64 may be convex in the same direction. For example, both the upper chamfered portion 62 and the lower chamfered portion 64 may have the protrusion 66 that is convex inward (inwardly curved portion 68), or may have the protrusion 66 that is convex outward (outwardly curved portion 69).

[0059] Furthermore, both the upper chamfer 62 and the lower chamfer 64 may be formed on a flat surface.

[0060] 5 and 7, in this embodiment, the tab 50 is provided on an extension line connecting the upper chamfered portion 62 and the lower chamfered portion 64. Because the tab 50 is provided in a highly integrated manner with the upper chamfered portion 62 and the lower chamfered portion 64, the force acting on the tab 50 during the lid opening operation is easily transmitted to the entire top surface 10 and lid side wall 20. This makes it easy to remove the lid 1.

[0061] Other Embodiments (1) In the above embodiment, an example has been described in which the lower chamfered portion 64 is formed vertically longer than the upper chamfered portion 62. However, the present invention is not limited to such a configuration. For example, the upper chamfered portion 62 may be formed vertically longer than the lower chamfered portion 64, or the upper chamfered portion 62 and the lower chamfered portion 64 may be formed to have approximately the same length. In other words, the ratio of the vertical lengths of the upper chamfered portion 62 and the lower chamfered portion 64 may be changed as appropriate. In this case, the ratio of the vertical widths of the upper inclined wall 22 and the lower inclined wall 24 is also changed accordingly.

[0062] (2) In the above embodiment, the lower base of the lower chamfered portion 64 is formed in an arc shape that convex outward in a plan view. However, the present invention is not limited to such a configuration. For example, the lower base of the lower chamfered portion 64 may be formed in a linear shape in a plan view. In this case, the narrow groove portions 36A located at the four corners of the circumferential groove portion 36 may be formed in a corner-cut shape in a plan view.

[0063] (3) In the above embodiment, the configuration in which the lower bottom of the lower chamfered portion 64 and the lid flange portion 30 are connected via the circumferential groove portion 36 has been described as an example. However, the present invention is not limited to such a configuration, and the lower bottom of the lower chamfered portion 64 and the lid flange portion 30 may be directly connected. In other words, the lid flange portion 30 may extend horizontally directly from the lower end of the lower chamfered portion 64.

[0064] (4) In the above embodiment, an example has been described in which the tabs 50 are provided at all four corners of the lid 1. However, the present invention is not limited to such a configuration, and for example, the tabs 50 may be provided at only two diagonally opposite corners of the four corners of the lid 1. Alternatively, the tabs 50 may be provided at only one specific corner of the four corners of the lid 1.

[0065] (5) In the above embodiment, the lid 1 and the container body 9 are described as being rectangular in plan view. However, the present invention is not limited to such a configuration, and the lid 1 and the container body 9 may be formed in other rectangular shapes, such as a square, a parallelogram, or a trapezoid, in plan view. Alternatively, the lid 1 and the container body 9 may be formed in other polygonal shapes, such as a pentagon, a hexagon, or an octagon, in plan view. In either case, an inverted trapezoidal upper chamfered portion 62 and a regular trapezoidal lower chamfered portion 64 are provided at the connection portion where adjacent lid side walls 20 of the lid 1 are connected to each other.

[0066] (6) In the above embodiment, the specific configuration of the container body 9 used in combination with the lid 1 in the packaging container 100 has been described by way of example. However, the specific configuration of the container body 9 is not limited to such a configuration, and any configuration may be used.

[0067] (7) The configurations disclosed in the above-described embodiments (including the above-described embodiments and other embodiments; the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. Regarding other configurations, the embodiments disclosed in this specification are illustrative in all respects and can be appropriately modified within the scope of the present disclosure. [Explanation of symbols]

[0068] 1 Lid 10 Top section 20 Lid side wall (side wall) 30 Lid flange (flange) 36 Peripheral groove (groove) 50 knob 60 Chamfer 62 Upper chamfer 64 Lower chamfer 66 Protrusion 100 Packaging containers

Claims

1. A lid for a packaging container formed by sheet molding, The container has a flat top surface that is polygonal in plan view, flat sidewalls that extend downward from each side of the top surface, and flanges that extend outward from the sidewalls, A chamfered portion formed in a chamfered shape is provided at a connecting portion between adjacent side wall portions, the chamfered portion includes an upper chamfered portion continuing from the top surface portion and a lower chamfered portion continuing from the flange portion, The upper chamfered portion has an inverted trapezoidal shape with a lower base that is shorter than the upper base, and the lower chamfered portion has a regular trapezoidal shape with an upper base that is shorter than the lower base, and the upper chamfered portion and the lower chamfered portion are connected at their respective short sides.

2. 2. The lid according to claim 1, wherein at least one of the upper chamfered portion and the lower chamfered portion has a protrusion that is convex inward or outward.

3. 3. The lid according to claim 2, wherein both the upper chamfered portion and the lower chamfered portion have the protrusion, and the protrusion of the upper chamfered portion and the protrusion of the lower chamfered portion are convex in opposite directions.

4. The lid according to any one of claims 1 to 3, wherein a lower base of the lower chamfered portion is formed in an arc shape that is convex outward in a plan view.

5. The lid according to any one of claims 1 to 3, wherein a lower base of the lower chamfered portion and the flange portion are connected via a groove portion recessed downward.

6. Further, the grip portion is formed of a protruding piece that protrudes outward from the flange portion, The lid according to claim 1 , wherein the knob is provided on an extension line connecting the upper chamfered portion and the lower chamfered portion.

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