JP2024075475A - Lid, lid blank, lid and container combination, and container with lid - Google Patents

Abstract

[Problem] To provide a lid, a blank material for a lid, a combination of a lid and a container, and a container with a lid, which are formed using a paper-based material and can suppress a decrease in the airtightness of the container with a lid even when used as a container with a lid, and which can be easily fitted into a container even if the container dimensions vary.
[Solution] The lid body is configured so that it can be attached to a container having an opening and an edge that forms the opening, and when attached to the container, it has a top surface that covers the opening, and a side wall portion that contacts the edge and is formed in a ring shape along the outer peripheral edge of the top surface, and is provided with a bent portion on the outer peripheral edge of the top surface and a plurality of small wall portions that are connected to the top surface via the bent portion so as to surround the periphery of the top surface, the bent portion forms the boundary between the top surface and the side wall portion, and the side wall portion is formed of the plurality of small wall portions and has an overlap portion where adjacent small wall portions partially overlap, and the overlap portion has a small wall joint formed therein that joins adjacent small wall portions.
[Selected Figure] Figure 1

Description

The present invention relates to a lid, a blank for a lid, a combination of a lid and a container, and a container with a lid.

It is common for convenience stores, fast food restaurants, and other establishments to provide food and beverages (hereinafter also referred to as "contents") in containers that have an opening, an edge that defines the opening, and a space formed behind the opening. When providing the contents to customers, the containers are often provided with a lid attached. In this case, the lid is attached to the container with the contents contained therein, and the contents are often provided in a lidded container (contained in packaging).

A known lid has a top surface and a side wall surrounding the top surface. When a lid is used to make a container, the side wall of the lid is fitted to the edge of the container. Conventionally, lids made of molded plastic have been widely used as the material for such lids, but from the perspective of reducing the environmental impact, there is a demand for lids made of materials that use as little plastic as possible. Therefore, it has been proposed to form lids using paper material (Patent Document 1).

JP 2020-37433 A

In Patent Document 1, a lid is formed by shaping a blank material, and the top surface and side wall of the lid are continuous. With such a lid, the contact area between the container and the lid, including the side wall, ends up with a large number of wrinkles or folds, which may reduce the airtightness of the container with the lid.

From the viewpoint of preventing the lid from forming a large number of wrinkles or folds over the entire contact area between the lid and the container, it is also possible for the lid to have a structure in which the top and side walls are formed separately and then a member forming the side walls is attached around the periphery of the top. In this case, if the side walls of the lid are formed from a paper-based material, the hardness of the side walls tends to increase, and if there is variation in the dimensions of the container, it may become difficult to fit the lid into the container if the dimensions of the container become larger than expected.

Therefore, even if the lid is formed using a paper-based material and used as a container with a lid, there is room for improvement in terms of preventing a decrease in the airtightness of the container with a lid and making it easier to fit into the container even if the container dimensions vary.

The gist of the present invention is as follows: (1) to (11).

(1) A lid that is configured to be attached to a container having an opening and an edge that forms the opening, and that has a top surface that covers the opening when attached to the container, and a side wall portion formed in a ring shape along an outer peripheral edge of the top surface, a bent portion at the outer peripheral edge of the top surface, and a plurality of small wall portions connected to the top surface via the bent portion that is formed so as to surround the periphery of the top surface, wherein the bent portion forms a boundary between the top surface and the side wall portion, the side wall portion has a structure formed from the plurality of small wall portions, and has an overlap portion in which adjacent small wall portions partially overlap, and a small wall joint portion that joins adjacent small wall portions is formed in the overlap portion.
(2) The lid body described in (1) above, wherein the small wall portion has an inner surface facing the container when attached to the container and an outer surface that is the opposite side to the inner surface, and when adjacent small wall portions are a first small wall portion and a second small wall portion, the small wall joint has a structure in which the inner surface of the first small wall portion and the outer surface of the second small wall portion are joined together.
(3) The lid body described in (1) above, wherein the small wall portion has a base end and a front edge portion, and the width of at least a portion of the small wall portion is greater at the front edge portion than at the base end portion.
(4) The lid body according to (1) above, wherein the side wall portion is tapered from the bent portion toward the front end of the small wall portion.
(5) The lid body according to (1) above, wherein the width of the small wall joint has a portion where it increases from the bent portion toward the front end of the small wall.
(6) The lid body described in (1) above, wherein the side wall portion and the curved portion have a paper-based material.
(7) The lid body according to (1) above, wherein the small wall portion has a resin layer.
(8) A blank material for forming the lid described in (1) above, comprising a first corresponding portion corresponding to the top surface portion and a second corresponding portion formed into a shape corresponding to the side wall portion.
(9) The blank material for a lid body described in (8) above is formed from a circular sheet material, the second corresponding portion has a cut portion extending inward from the outer peripheral edge of the sheet material, and when the lid body is formed, the portion between adjacent cut portions corresponds to the small wall portion.
(10) A combination of a lid and a container comprising the lid described in (1) above and the container having the opening and the edge portion that forms the opening.
(11) A container with a lid, comprising the lid described in (1) above, and a container having an opening and an edge portion that forms the opening, and having a structure in which the lid described is attached to the container.

According to the present invention, even when a paper-based material is used to form a container with a lid, it is possible to suppress a decrease in the airtightness of the container with a lid, and it is possible to realize a lid, a blank material for the lid, a combination of a lid and a container, and a container with a lid that can be easily fitted into a container even if the container has variations in dimensions.

Fig. 1A is a plan view for explaining an example of a lid according to the first embodiment. Fig. 1B is a side view for explaining an example of a lid according to the first embodiment. Fig. 1C is a cross-sectional view showing a schematic state of a vertical section taken along line A-A in Fig. 1A. Fig. 1D is a cross-sectional view showing a schematic state of a vertical section taken along line B-B in Fig. 1B. Fig. 2A is a plan view for explaining an example of a blank for forming a lid according to the first embodiment. Fig. 2B is a cross-sectional view showing a schematic state of a vertical section taken along line CC in Fig. 2A. Fig. 2C is a view for explaining an example of a process for shaping a blank. Fig. 2D is a view for explaining a state of the blank in Fig. 2C when viewed from the direction of arrow D. 3A to 3D are plan views for explaining modified examples of the lid according to the first embodiment. Fig. 4A is a plan view showing another example of the blank piece, and Fig. 4B is a cross-sectional view showing a schematic vertical cross section taken along line EE of Fig. 4A. FIG. 5A is a plan view for explaining another example of the blank piece. FIG. 5B is a cross-sectional view for explaining another example of the blank piece. 6A and 6B are cross-sectional views for explaining an example of the lid according to the first embodiment. 7A, 7B, and 7C are cross-sectional views for explaining an example of the lid according to the first embodiment. Fig. 8A is a plan view for explaining an example of a lid according to the third embodiment, Fig. 8B is a side view for explaining an example of a lid according to the third embodiment, and Fig. 8C is a cross-sectional view showing a schematic state of a vertical cross section taken along line F-F in Fig. 8A. Fig. 9A is a plan view for explaining an example of the lid according to the first embodiment, Fig. 9B is a side view for explaining an example of the lid according to the first embodiment, and Fig. 9C is a plan view for explaining an example of the use state of the lid shown in Fig. 9A. Fig. 10A is a plan view for explaining an example of the lid according to the first embodiment, and Fig. 10B is a side view for explaining the example of the lid according to the first embodiment. Fig. 11A is a plan view for explaining an example of a lid according to the second embodiment, Fig. 11B is a side view for explaining an example of a lid according to the second embodiment, and Fig. 11C is a cross-sectional view showing a schematic state of a vertical cross section taken along line G-G in Fig. 11A. Fig. 12A is a plan view for explaining an example of the lid according to the first embodiment, and Fig. 12B is a cross-sectional view showing a schematic vertical cross section taken along line HH in Fig. 12A. 13A, 13B, 13C, 13D, 13E, 13F, and 13G are plan views for explaining an example of the lid according to the first embodiment. Fig. 14A is a plan view for explaining an example of a lid according to the third embodiment, Fig. 14B is a side view for explaining an example of a lid according to the third embodiment, and Fig. 14C is a cross-sectional view showing a schematic state of a vertical cross section taken along line II in Fig. 14A. Fig. 15A is a plan view for explaining an example of a cover according to the third embodiment, and Fig. 15B is a cross-sectional view showing a schematic vertical cross section taken along line JJ in Fig. 15A. FIG. 16 is a diagram for explaining an embodiment of a process for shaping a blank piece. 17A and 17D are cross-sectional views for explaining an example of a lid according to the first embodiment, FIG. 17B is a cross-sectional view for explaining an example of a lid according to the third embodiment, and FIG. 17C is a cross-sectional view for explaining an example of a lid according to the second embodiment. 18A and 18D are cross-sectional views for explaining an example of a lid according to the first embodiment, FIG. 18B is a cross-sectional view for explaining an example of a lid according to the third embodiment, and FIG. 18C is a cross-sectional view for explaining an example of a lid according to the second embodiment. Fig. 19A is a perspective view for explaining one embodiment of a container with a lid, and Fig. 19B is a cross-sectional view showing a schematic vertical cross section taken along line K-K in Fig. 19A. FIG. 20 is a partial cross-sectional view for explaining one embodiment of a container with a lid in which the lid has a protruding portion. Fig. 21A is a plan view for explaining an example of a lid according to the fourth embodiment, Fig. 21B is a side view for explaining an example of a lid according to the fourth embodiment, and Fig. 21C is a cross-sectional view showing a schematic state of a vertical cross section taken along line L-L in Fig. 21A. Fig. 22A is a side view for explaining an example of a lid according to the sixth embodiment. Fig. 22B is a cross-sectional view for explaining an example of a lid according to the sixth embodiment. Fig. 23A is a side view for explaining an example of a lid according to the fifth embodiment. Fig. 23B is a cross-sectional view for explaining an example of a lid according to the fifth embodiment. FIG. 24 is a plan view for explaining one example of the modified example 3 of the third embodiment. 25A and 25B are cross-sectional views for explaining one example of a state in which the lid body according to the first embodiment is attached to the container. Fig. 26A is a cross-sectional view for explaining an example of a state in which the lid body according to the third embodiment is attached to a container. Fig. 26B is a cross-sectional view and a partially enlarged cross-sectional view for explaining an example of a state in which the lid body according to the third embodiment is attached to a container. FIG. 27 is a partial cross-sectional view for explaining one example of a state in which the lid body according to the fourth embodiment is attached to the container.

Below, an embodiment of the present invention will be described with reference to the drawings. The description will be given in the following order: 1. First embodiment, 2. Second embodiment, 3. Third embodiment, 4. Application example. In this specification and the drawings, components having substantially the same functional configuration will be denoted by the same reference numerals, and duplicated description will be omitted.

The following description is a preferred specific example of the present invention, and the contents of the present invention are not limited to the embodiments described. In addition, in the following description, directions such as front-back, left-right, and up-down are shown for convenience of explanation, but the contents of the present invention are not limited to these directions. In the example of Figures 1 and 2, the Z axis direction is the up-down direction (upper side is the +Z direction, lower side is the -Z direction), the X axis direction is the front-back direction (front side is the +X direction, rear side is the -X direction), and the Y axis direction is the left-right direction (right side is the +Y direction, left side is the -Y direction), and the description will be based on this. The same applies to Figures 3 to 27.

The relative size and thickness ratios of each layer shown in each figure, such as Figure 1, are described for convenience and do not limit the actual size ratios. The same definitions regarding these directions and size ratios apply to each of Figures 2 to 27.

The lid according to the present invention will be described as an example of a lid used for a container (cup) for holding fluids such as various beverages, such as a coffee cup, but it is not limited to a lid for a container for holding beverages, and can also be applied to a container for holding food products other than beverages. The lid according to the present invention can also be applied to a container that can hold various items other than food and beverages, such as parts such as bolts and nuts, and items other than those mentioned above. Furthermore, in the following, the lid according to the present invention will be described using an example of a lid that has a circular shape when viewed in a plane, but the shape of the lid is not limited to a circular shape when viewed in a plane, and can be applied to various shapes other than a circle, such as an ellipse, a rectangle, a polygonal shape such as a triangle, a chamfered rectangle, a chamfered polygonal shape, etc. However, from the viewpoint of further enhancing the effect of the present invention, it is preferable that the lid is attached to a container that contains a fluid. Note that the fluid includes not only a liquid or a powder that has fluid properties, but also a liquid and a solid used in combination.

[1. First embodiment]
[1-1 Lid]
The lid 10 according to the first embodiment of the present invention can be used (as a lidded container 150) in a state where it is attached (fitted) to an edge 103 of an opening 102 of a container 101, as described later with reference to Fig. 19 etc. The lid 10 is formed so as to be able to form a contact region R that contacts the edge 103 with respect to the container 101 having the opening 102.

As shown in Figs. 1A to 1D, the lid 10 has a top surface 11 and a side wall 13, and the top surface 11 and the side wall 13 are continuous at a bent portion 12. Figs. 1A to 1D are diagrams for explaining one embodiment of the lid 10. The container 101 is not prohibited from being a container with little or no flexibility, such as a metal container, but the effect of using the lid 10 of the present invention can be enhanced when the container has flexibility at the edge of the opening 102.

(Top surface)
1A to 1D, when the lid 10 is attached (mounted) to the container 101, the top surface 11 is a portion that covers the opening 102 of the container 101. The shape of the top surface 11 may be determined according to the shape of the container 101, and examples of the shape include a circular shape, an elliptical shape, a triangular shape, a rectangular shape, a polygonal shape, and a chamfered shape.

(Bend)
The bent portion 12 is formed so as to surround the outer periphery of the top surface portion 11, and is a portion that forms the boundary between the top surface portion 11 and the side wall portion 13. The bent portion 12 is formed so that the side wall portion 13 faces the side wall 104 and edge portion 103 of the container 101 when the lid body 10 is attached to the container 101. In the example of FIG. 1A to FIG. 1D, the bent portion 12 has a bent structure, but as described later, the bent portion 12 is not limited to having a bent structure. In addition, the "portion that forms the boundary between the top surface portion 11 and the side wall portion 13" includes both a case where the portion itself forms a boundary and a case where a boundary is defined inside or at an end of the portion (a case where a part of the top surface portion 11 and/or the side wall portion 13 also serves as the bent portion 12). 1A to 1D, the curved portion 12 is formed at the boundary between the top surface portion 11 and the side wall portion 13, and the top surface portion 11 and the side wall portion 13 are defined by the curved portion 12. The boundary between the top surface portion 11 and the side wall portion 13 is determined at the center of the curved portion 12. When the curved portion 12 has a curved structure as shown in Fig. 7A etc., the curved portion 12 is composed of a portion specified by the curved range, and the boundary between the top surface portion 11 and the side wall portion 13 is determined approximately at the center of the curved portion 12. This also applies to the case where the curved portion 12 is formed by a protruding portion 26 described later.

(Side wall portion)
The side wall portion 13 is formed in an annular shape along the outer peripheral edge 11A of the top surface portion 11. The side wall portion 13 has a plurality of small wall portions 14, which will be described later, and also has an overlapping portion 30 in which adjacent small wall portions 14 partially overlap. In the overlapping portion 30, a small wall joint portion 15 that joins adjacent small wall portions 14 is formed.

(Overall shape of side wall)
The shape of the side wall portion 13 is not particularly limited, but in the examples of Figures 1A to 1D, the overall shape of the side wall portion 13 is tapered in the vertical direction from the bent portion 12 toward the front end of the small wall portion 14 (-Z direction). The tapered shape referred to here indicates a shape in which, in a plan view of the lid body 10, the cross section of the side wall portion 13 (the cross section of the side wall portion 13 that can be recognized even when the side wall portion 13 is cut along a plane parallel to the XY plane) is formed at a predetermined position below the bent portion 12 on the inside of the cross section of the side wall portion 13 near the bent portion 12, and in the examples of Figures 1A to 1D, the cross section of the side wall portion 13 is formed to become smaller as it moves away from the position of the bent portion 12. Regarding the shape of the side wall portion 13, there are shapes for the inner circumferential surface 13A of the side wall portion 13 and shapes for the outer circumferential surface 13B of the side wall portion 13, but it is preferable that either shape corresponds to a tapered shape as shown in the examples of Figures 1A to 1D.

(Small wall section)
The cover 10 has a plurality of small wall portions 14, which are formed to be continuous with the top surface portion 11 via the bent portion 12. The small wall portions 14 have a base end portion 31 and a front edge portion 32, with the base end portion 31 located at the bent portion 12 and the front edge portion 32 forming the lower end of the side wall portion 13. In the example of Figures 1A to 1D, the base end portion 31 forms the upper end of the side wall portion 13, but this is just one example.

The outer peripheral edge of the small wall portion 14, excluding the base end portion 31 and the front end portion 32, forms the side end portion 33. The shape of the side end portion 33 is not particularly limited as long as it can form the overlapping portion 30 described later, but it is preferable that one side end portion 33 of adjacent small wall portions 14 and the other side end portion 33 facing the one side end portion 33 are formed in a shape parallel to each other in the state of the blank material 50 described later. In the example of FIG. 1, the shape of the side end portion 33 is formed in a straight line extending outward (in the radial direction of the blank material 50) from the center of the blank material 50 (position CB in FIG. 2) in a plan view of the blank material 50 described later. The small wall portion 14 is composed of individual folding margin portions 51 in the blank material 50 described later. In the example of the case where the blank material 50 shown in the example of FIG. 2A is shaped to form the lid body 10 of FIG. 1A, the center CB of the blank material 50 is approximately the center CT of the lid body 10.

The small wall portion 14 is formed to surround the outer peripheral end 11A of the top surface portion 11. That is, the multiple small wall portions 14 are formed to be aligned in the circumferential direction of the top surface portion 11 along the bend portion 12. In addition, adjacent small wall portions 14 in the circumferential direction of the top surface portion 11 partially overlap each other. The overlapping structure of adjacent small wall portions 14 may be the same for all small wall portions 14 aligned in the circumferential direction of the top surface portion 11. For example, among the side end portions 33 of the small wall portion 14, the side end portion 33 on the X-direction side in FIG. 1B is the first side end portion 33A, and the side end portion 33 on the +X-direction side is the second side end portion 33B (the first side end portion 33A and the second side end portion 33B are determined so that the direction from the first side end portion 33A to the second side end portion 33B when looking at the side end portion 33 of the small wall portion 14 coincides with the clockwise direction in the circumferential direction of the top surface portion 11). In this case, as shown in the example of FIG. 1, the overlapping structure of adjacent small wall portions 14 is determined so that the first side end portion 33A is located on the inner circumferential surface 13A side of the side wall portion 13, and the second side end portion 33B is located on the outer circumferential surface 13B side of the side wall portion 13. Note that this is only an example, and does not limit the overlapping structure of adjacent small wall portions 14.

In the example of FIG. 1, the small wall portion 14 has an inner surface portion 34 that faces the container 101 when attached to the container, and an outer surface portion 35 that faces the opposite side to the inner surface portion 34, and the exposed portion of the inner surface portion 34 of the small wall portion 14 forms the inner peripheral surface 13A of the side wall portion 13. Also, in the example of FIG. 1, the exposed portion of the outer surface portion 35 of the small wall portion 14 forms the outer peripheral surface 13B of the side wall portion 13.

The shape of the small wall portion 14 is not particularly limited, but it is preferable that at least a portion of the small wall portion 14 has a shape in which the width is greater at the front edge than at the base end. In this case, as shown in the example of FIG. 1, it is preferable that the width WN of the small wall portion 14 gradually increases from the base end 31 toward the front edge 32. An example of such a shape of the small wall portion 14 is a sector shape.

The small wall portion 14 preferably has a resin layer (preferably a thermoplastic resin layer) formed on at least one of the surfaces of the inner surface portion 34 and the outer surface portion 35. In this case, when forming the lid body 10 from the blank material 50 described below, a heating process or ultrasonic welding process can be performed to easily form the small wall joint portion 15 in the overlapping portion 30. This can be achieved by using a sheet material having a resin layer formed on at least one surface as the material for the lid body 10 (as the material for the blank material 50). Specific examples of sheet materials include those having a laminated structure of a layer formed of a paper-based material (e.g., paper) and a resin layer (e.g., coated paper).

(Overlapping part)
An overlapping portion 30 is formed in the side wall portion 13. The overlapping portion 30 is a portion defined by a structure in which adjacent small wall portions 14 partially overlap each other. In the example of Fig. 1A to Fig. 1D, when, among the surfaces constituting the small wall portions 14 as described above, the surface facing the container 101 when attached to the container 101 is defined as the inner surface portion 34, and the surface on the opposite side to the inner surface portion 34 is defined as the outer surface portion 35, the overlapping portion 30 is defined as the portion where the inner surface portion 34 of one small wall portion 14 faces the outer surface portion 35 of the other small wall portion 14. In the examples of Figures 1A to 1D, when the adjacent small wall portions 14 are defined as a first small wall portion 14A and a second small wall portion 14B (for example, when the first small wall portion 14A and the second small wall portion 14B are defined so that the direction from the first small wall portion 14A to the second small wall portion 14B is clockwise), the inner surface portion 34 of the first small wall portion 14A faces the outer surface portion 35 of the second small wall portion 14B.

The overlapping portion 30 is not particularly limited, but preferably has a portion in which the width of the overlapping portion 30 increases from the base end 31 of the small wall portion 14 toward the front end edge 32. In the example of Fig. 1A to Fig. 1D, the overlapping portion 30 has a shape in which the width WK of the overlapping portion 30 gradually increases from the base end 31 of the small wall portion 14 toward the front end edge 32. When the overlapping portion 30 is formed in this manner, it becomes easy to form the formation region of the small wall joint 15 described later so as to be similar to the overlapping portion 30, and it becomes easy to form a structure that enhances the effect of the small wall joint 15. The width of the overlapping portion 30 (width WK in Fig. 1) refers to the length of the region along the surface of the overlapping portion 30 in the direction parallel to the straight line M, assuming that the straight line M connects the two ends 31A and 31B of the base end 31 of the small wall portion 14.

(Small wall joint)
In the overlapping portion 30, the opposing surfaces of the small wall portions 14 constituting the overlapping portion 30 are joined to each other, and this joined portion is the small wall joint portion 15. In the example of FIG. 1A to FIG. 1D, the outer surface portion 35 of the first small wall portion 14A and the inner surface portion 34 of the second small wall portion 14B are defined as the joined portion. By forming the small wall joint portion 15, it is possible to restrict the adjacent small wall portions 14 from moving freely relative to each other, and the overall shape of the side wall portion 13 is easily stabilized. In particular, unlike the conventional wrinkled structure such as fine wrinkles or folds formed by the parts constituting the blank material being densely formed by shaping the blank material, the small wall joint portion 15 is a surface-joined portion, so that the shape of the side wall portion 13 is more easily stabilized. Note that this does not prohibit the formation of a conventional wrinkled structure in addition to the small wall joint portion 15.

The formation area of the small wall joint 15 is not particularly limited as long as it is an area that can suppress the small wall portion 14 constituting the side wall portion 13 from freely rotating around the base end portion 31. However, from the viewpoint of maintaining the shape stability of the lid body 10 while preventing the side wall portion 13 from deforming at a position far from the bend portion 12 (at a position close to the lower end of the side wall portion 13) and allowing the side wall portion 13 to deform relatively closer to the bend portion 12 than the lower end of the side wall portion 13, it is preferable that the width WD of the small wall joint 15 has a portion that becomes larger from the bend portion 12 toward the front end of the small wall portion 14. In this case, it is preferable that the formation area of the overlap portion 30 is similar. In this case, the overlap portion 30 and the small wall joint 15 can be formed approximately at the same time by subjecting the overlap portion 30 to a heat fusion treatment (heating treatment, etc.) or ultrasonic welding treatment in conjunction with the formation of the overlap portion 30. The width of the small wall joint 15 (width WD in FIG. 1) refers to the length of the area along the surface of the small wall joint 15 in the direction parallel to the line M described above.

In the examples of Figures 1A to 1D, the width WD of the small wall joint 15 gradually increases from the base end 31 to the front edge 32 of the small wall portion 14. An example of the formation region of such a small wall joint 15 is a roughly fan-shaped formation region (a shape in which fan shapes are partially overlapped).

(Lid material)
The material of the lid 10, i.e., the material of the top surface 11, the side wall 13, and the curved portion 12, is not particularly limited, and examples thereof include paper-based materials, plastics, metals, etc., but a paper-based material is preferable. In particular, it is preferable that the material of the side wall 13 and the curved portion 12 be a paper-based material from the viewpoint of achieving both shape retention and environmental consideration, and it is more preferable that the entire lid 10 be made of a paper-based material. Examples of paper-based materials include so-called paper obtained by spreading a slurry of a fiber raw material onto a screen, drying or pressing and drying, and making a sheet, so-called airlaid sheets obtained by stacking spread fiber raw materials such as ground pulp obtained by grinding a raw material sheet made of pulp-based fibers or the like with a grinder, using an air flow to fix the fibers of the stack with a binder, so-called papers produced by agglutinating plant fibers and other fibers, as well as chemical fiber paper, synthetic paper, waterproof paper, coated paper, substitute paper, parchment, wool paper, glass fiber paper, stone paper, ceramic paper, etc., and sheets of these laminated together, etc. In addition, the paper-based material may be one made only of pulp, or one containing non-pulp-based natural fibers, synthetic fibers, recycled fibers, etc., but it is preferable that the paper contains 50% by mass or more of pulp, more preferably 70% by mass or more, and even more preferably 80% by mass or more, and particularly preferably 100% by mass of pulp. The paper-based material can be a composite material with a synthetic or natural resin film, a nonwoven fabric, a wood-based material such as wood foil, or even with a material such as aluminum foil. In the case of a composite material, the composite material as a whole preferably contains 50% by mass or more of pulp, and more preferably contains 80% by mass or more of pulp. The higher the pulp content, the easier the paper-based material is to biodegrade, which is preferable. The material of the lid 10 can also be preferably used as a laminate containing a paper-based material.

[1-2 Lid blank and manufacturing method]
1A to 1D, in the present invention, the lid 10 has a three-dimensional shape as a whole due to the different surface directions of the top surface 11 and the side wall 13. Such a three-dimensional shape of the lid 10 can be realized, for example, by deforming (shaping) a lid blank into a shape corresponding to the shape of the lid 10 using a molding device or the like. In this specification, the lid blank may be simply referred to as a blank.

(Blank material for lid)
The lid blank (blank 50) is a blank 50 corresponding to the lid 10. For example, the blank 50 for the lid 10 shown in the example of Figs. 1A to 1D is composed of a sheet-like structure formed into a shape determined according to the lid 10. The material of the blank 50 is determined to be the same as the material of the lid 10. When the blank 50 is sheet-like, it includes a blank 50 having holes 16, tab members 19, etc., provided at corresponding positions in accordance with the shape and configuration of the lid 10, as described below.

(First Corresponding Part and Second Corresponding Part)
2A , the blank 50 has a first corresponding portion 52 and a second corresponding portion 53. The portion of the blank 50 that corresponds to the portion that will become the top surface 11 of the lid 10 is the first corresponding portion 52, and the portion that corresponds to the portion that will become the side wall 13 is the second corresponding portion 53.

The blank material 50 corresponding to the lid body 10 shown in FIG. 1A can be formed of a circular sheet material 55 as shown in FIG. 2A. The blank material 50 has a plurality of cut portions 54 extending from the outer periphery of the sheet material 55 toward the inside, and in the example of FIG. 2A, the portion between adjacent cut portions 54 along the outer periphery of the sheet material 55 becomes a fold portion 51 that is bent when the blank material 50 is shaped. The portion formed by the combination (assembly) of the fold portions 51 forms the second corresponding portion 53. Note that when the fold portion 51 is bent in the direction of the arrow FD as shown in FIG. 2B, the fold portion 51 forms the small wall portion 14 (or forms a part of the small wall portion) when the blank material 50 is changed in shape to the lid body 10. In addition, when the blank material 50 is folded at a predetermined position further toward the center than the position of the inner end 63 of the cut portion 54, the blank material 50 shown in FIG. 5A can be used, and the folding margin portion is composed of a plurality of first folding margin portions 60 sandwiched between adjacent cut portions, and a second folding margin portion 61 composed of a portion that is further inward (toward the center of the blank material 50) than the first folding margin portions 60 (a portion from the outer edge of the sheet material 55 to a position that becomes the folding axis). The first folding margin portion 60 is a portion that extends outward from the second folding margin portion 61. The second corresponding portion 53 is formed by a combination of a plurality of first folding margin portions 60 and the second folding margin portion 61. The overlapping portion 30 is formed by an overlapping structure of the first folding margin portions 60. In addition, the small wall portion 14 is formed by the first folding margin portion 60.

(Another example 1 of a lid blank)
The lid blank (blank 50) is not limited to the structure shown in FIG. 2A , and may have a notch 56 instead of the cutout 54, as shown in FIGS. 4A and 4B . In this example, the portion between adjacent cutouts 56 becomes the fold margin 51. The notch 56 may be used in combination with the cutout 54. As shown in FIG. 4A , the cutout 56 is formed so as to be smaller than the portion that is expected to become the overlapping portion 30 that will be formed when the lid 10 is manufactured from the blank 50. In FIG. 4 , the dashed line MR indicates the boundary between the portion that is expected to become the overlapping portion 30 that will be formed when the lid 10 is manufactured and the portion that falls outside the overlapping portion 30.

(Another example 2 of the lid blank)
The lid blank is not limited to the structure shown in Fig. 2, and may have, for example, half-cut portions 57 cut partially into the thickness direction of the blank 50 instead of the cut portions 54, as shown in Fig. 5A and 5B. In this case, the portion between adjacent half-cut portions 57 becomes the folding margin. The half-cut portions 57 may be used in combination with the cut portions 54.

(Method of manufacturing the lid)
The lid 10 can be manufactured by, for example, forming the blank 50 into a shape corresponding to the shape of the lid 10 using a lid forming device or the like. An example of the lid forming device is a device having a pair of male and female molds (not shown). The male and female molds are separated, the blank is placed between the male and female molds, and the molds are clamped to form the shape. At this time, the blank 50 is folded at the inner end of the second corresponding portion 53 (the boundary between the first corresponding portion 52 and the second corresponding portion 53) as shown in FIG. 4B, and at that time, a structure (overlap portion 30) is formed in which the adjacent folding margin portions 51 overlap each other as shown in FIG. 4C. The conditions such as the width of the overlap portion 30 can be determined by adjusting the shape of the mold and the control of the lid forming device. By forming the blank 50, the first corresponding portion 52 becomes the top surface portion 11, and the second corresponding portion 53 becomes the side wall portion 13. 2A , the folding margin portion 51 forming the second corresponding portion 53 becomes the small wall portion 14. In this example, the boundary between the first corresponding portion 52 and the second corresponding portion 53 generally becomes the bent portion 12.

When the side wall portion 13 of the lid body 10 has a tapered shape as shown in FIG. 1, it is preferable that at least one of the male and female molds is a separable mold from the viewpoint of achieving mold clamping.

In addition, from the viewpoint of forming the small wall joint 15 at the same time as the shaping, it is preferable that the lid body forming device is provided with a joining mechanism for forming the small wall joint 15. Examples of the joining mechanism include a heating mechanism configured to perform a heat treatment for heating at least a part of the overlapping part 30, and an ultrasonic welding mechanism configured to perform an ultrasonic welding process on a part of the overlapping part 30. For example, assume that a circular sheet-shaped coated paper (e.g., a paper having a structure in which a resin layer is laminated on the paper) is used as the blank material 50, and that a cut portion 54 as shown in FIG. 2A is formed from the outer periphery of the coated paper toward the inside, and the portion sandwiched between the adjacent cut portions 54 is the folding margin portion 51. In this case, when the folding margin portion 51 is made into the small wall portion 14 by the lid body forming device or the like, the resin layer is exposed on the surface of one side of the opposing surface of the adjacent small wall portions 14 in the overlapping part 30. Therefore, by using the joining mechanism described above in accordance with the shaping of the blank piece 50, the surfaces of the small wall sections 14 that face each other at the overlapping section 30 can be joined by a resin layer, forming the small wall joint section 15.

[1-3 Actions and Effects]
In the lid of the present invention, the side wall portion 13 has a structure in which a plurality of small wall portions 14 continuous with the top surface portion 11 are partially overlapped, and the top surface portion 11 and the side wall portion 13 can be formed by shaping the sheet-like blank material 50. In addition, the adjacent small wall portions 14 are surface-joined by forming a small wall joint portion 15 at the overlapping portion 30, and the joining force can be increased as the width WD of the small wall joint portion 15 increases. In the lid of the present invention, the width WD of the small wall joint portion 15 is small at a position close to the bent portion 12 (because there are few portions fixed in an overlapping state), so that the side wall portion 13 near the bent portion 12 can have a structure that is relatively more flexible than the position far from the bent portion 12. Therefore, it is possible to temporarily deform the shape of the top surface portion 11 and the bent portion 12, and even if the dimensions of the container 101 vary, it is easy to temporarily apply a deformation force to the lid body 10 to fit the lid body 10 to the container 101. In addition, the width WD of the small wall joint 15 at a position of the side wall 13 far from the bent portion 12 (a position close to the lower end) is larger than the width WD at a position close to the bent portion 12, thereby stabilizing the shape of the side wall 13. Therefore, even if the shape of the top surface 11 or the bent portion 12 is temporarily deformed, a restoring force is easily exerted, and the restoring property of the shape of the side wall 13 can be improved.

In addition, since the small wall joint 15 of the lid of the present invention spreads in the surface direction (circumferential direction) of the side wall 13, the side wall 13 can be prevented from being irreversibly spread outward even if a force spreading in the surface direction acts on the side wall 13, compared to conventional lids having a pleated or wrinkled structure on the side wall. In other words, when the lid 10 is attached to a container 101 having a slightly larger dimension than the size of the inner peripheral surface 13A of the side wall 13 of the lid 10, even if a force in a direction spreading the side wall 13 (a force spreading the side wall 13 in the circumferential direction) acts on the side wall 13 of the lid 10, the side wall 13 is unlikely to be irreversibly spread, making it easier to maintain the lid 10 firmly attached to the container 101, and the risk of the side wall 13 of the lid 10 unintentionally spreading and impairing the airtightness of the lid-equipped container 150 is also prevented.

In a conventional lid having a fold or wrinkle-like structure in the side wall portion, the members constituting the side wall portion are continuous (there is no or few breaks) at the wrinkle formation location. In the lid body of the present invention, adjacent small wall portions 14 are cut, and in the side wall portion 13, the side end faces of the small wall portions 14 form the side ends of the overlapping portions 30. For this reason, when forming a lid body of the present invention having the same cross-sectional diameter as a conventional lid having a fold or wrinkle-like structure in the side wall portion, if the total area of the face-to-face contact area (the face-to-face contact area of the portion forming the wrinkles or folds) where the members constituting the side wall portion of the conventional lid come into face-to-face contact with each other is ARA1, and the total area of the overlapping portion 30 in the lid body of the present invention is ARA2, ARA2 is larger than ARA1. In other words, the total area of the small wall joints 15 formed in the overlapping portion 30 can be made larger than the joint area when wrinkles or folds are joined in a conventional lid, and in this respect, the lid of the present invention can stabilize the shape of the side wall portion 13 more than conventional lids.

The attachment of the lid 10 to the container 101 will be further described with reference to Figures 25A and 25B. Figure 25A is a cross-sectional view illustrating one embodiment of a state in which the side wall portion 13 of the lid 10 is hooked onto the edge portion 103 of the opening 102 of the container 101. Figure 25B is a cross-sectional view illustrating one embodiment of a state in which the opening 102 of the container 101 is closed by the lid 10.

When the lid body 10 is attached to the container 101, for example, the side wall portion 13 and the top surface portion 11 of the lid body 10 are hooked to one end of the edge portion 103 of the container 101, and the lid body 10 is bent obliquely upward so as to lift the side wall portion 13 on the side of the end portion (the boundary portion between the top surface portion 11 and the side wall portion 13) formed at a position away from the position ST1 of the hooked end portion (the boundary portion between the top surface portion 11 and the side wall portion 13). In FIG. 25A, the state PD1 of the lid body 10 that is not bent is shown by a dashed line, and the state PD2 of the lid body 10 that is bent is shown by a solid line. Then, while the lid body 10 is bent, the end portion of the lid body 10 on the position ST2 side is pulled in the direction of the arrow F1 until the lower end 13C of the side wall portion 13 of the lid body 10 is slightly outside the position directly above the edge portion 103 of the container 101 (at this time, the container 101 may be slightly deformed). Then, the side wall 13 is pushed down in the direction of the arrow V1. At this time, the deflection of the lid 10 is gradually eliminated. At this time, the end of the lid 10 that is hooked (the end on the position ST1 side) receives an outward force from the container 101 near the upper end of the side wall 13. Regarding the adhesion between the lid 10 and the container 101 at the end on the position ST1 side, in state PD2, the side wall 13, the top surface 11, and the bent portion 12 tend to hold the edge 103 of the container 101 due to the shape retention force at the overlapping portion 30 of the side wall 13 of the lid 10, and the lower end of the side wall 13 tends to wrap around the lower side of the edge 103 as shown by the arrow F2, so that the lid 10 and the container 101 can be more firmly attached to each other.

25B, when the lid 10 is in a state PD3 in which it is fitted to the edge 103 of the container 101, the edge 103 of the container 101 can apply a stress T to the lid 10 in the outward direction. Regarding the overall adhesion between the lid 10 and the container 101, the lid 10 receives a stress T from the container 101, but due to the shape retention force of the overlapping portion 30 of the side wall 13 of the lid 10, the edge 103 of the container 101 is easily embraced by the side wall 13, the top surface 11, and the bent portion 12, and the lower end of the side wall 13 is easily wrapped around the underside of the edge 103 as shown by the arrows F2 and F3, so that the lid 10 and the container 101 can be more firmly attached to each other. Additionally, while the top surface 11 is more susceptible to inward forces as indicated by the arrows F1A and F1B, the shape retention force of the overlapping portion 30 of the side wall 13 of the lid 10 acts to reduce the risk of the lid 10 coming off the container 101. This effect is particularly enhanced when the lid 10 is made of a paper-based material, as the shape retention of the side wall 13 is particularly improved.

[1-4 Modifications of the lid]
(Variation 1)
In the lid according to the first embodiment, as shown in Fig. 3A and Fig. 3D, the overlapping structure of adjacent small wall portions 14 forming the overlapping portion 30 may be different from that shown in Fig. 1 (Modification 1). Fig. 3A and Fig. 3D are side views for explaining an example of the lid according to Modification 1 of the first embodiment. In Fig. 3A, when the first small wall portion 14A and the second small wall portion 14B are defined so that the direction from the first small wall portion 14A to the second small wall portion 14B is clockwise, the outer surface portion 35 of the first small wall portion 14A faces the inner surface portion 34 of the second small wall portion 14B. In FIG. 3D , in a plan view of the lid 10 (showing a line of sight from the +Z direction side to the −Z direction side), when the first small wall portion 14A, the second small wall portion 14B, and the third small wall portion 14C are defined so that the direction from the first small wall portion 14A to the second small wall portion 14B is clockwise, the two side ends 33, 33 of the first small wall portion 14A and the third small wall portion 14C face the inner circumferential surface 13A of the side wall portion 13. In the overlapping portion 30, the outer surface portion 35 of the first small wall portion 14A and the inner surface portion 34 of the second small wall portion 14B partially face each other, and the outer surface portion 35 of the third small wall portion 14C and the inner surface portion 34 of the second small wall portion 14B partially face each other, so that the two side ends 33, 33 of the second small wall portion 14B sandwiched between the first small wall portion 14A and the third small wall portion 14C are exposed on the outer peripheral surface 13B side of the side wall portion 13.

(Variation 2)
In the lid 10 according to the first embodiment, as shown in FIG. 3B, the base end 31 of the small wall portion 14, which can roughly correspond to the position on the line connecting the inner ends of the cut portions 54 of the blank 50, may be located slightly below the bent portion 12 (Modification 2). FIG. 3B is a side view for explaining an example of the lid according to Modification 2 of the first embodiment. In this case, the side wall portion 13 is provided with the small wall portion 14, and an extension wall portion 36 is formed between the small wall portion 14 and the top surface portion 11 (between the small wall portion 14 and the bent portion 12 in the example of FIG. 3B) so as to connect the small wall portion 14 and the top surface portion 11 (connecting the small wall portion 14 and the bent portion 12 in FIG. 3B). In this case, when the blank 50 is shaped into the shape of the lid 10, as shown in FIG. 16, a structure (outward protruding portion 64) in which the inner end 63 of the cut portion 54 protrudes slightly outward may be formed. 16 is a plan view showing an embodiment of a state where the blank 50 is folded at the second corresponding portion 53 (folded to the -Z side). The structure of this outward protrusion 64 may be as it is, or may be pressed and crushed by a pair of dies to form a crush structure 65 as shown in FIG. 3B. At this time, wrinkles or folds may be formed in the crush structure 65. By forming wrinkles or folds in the crush structure 65, when an outward force is applied to the lid 10 near the bent portion 12 when the lid 10 is attached to the container 101, the bent portion 12 can be slightly stretched and deformed (deformed so as to stretch the wrinkles in the portion near the bent portion 12), and the entire lid 10 can be prevented from being destroyed.

As the blank material 50 of the lid body 10 according to the second modification of the first embodiment, for example, as described with reference to FIG. 5A, the second corresponding portion 53 may be configured with a fold margin portion (first fold margin portion 60) configured by the portion sandwiched between the cutout portions 54, and a second fold margin portion 61 formed on the inside in continuation with the first fold margin portion 60, can be used. The second fold margin portion 61 is formed in an annular shape, and is formed so that each of the first fold margin portions 60 extends outward from the outer periphery of the second fold margin portion 61. When the lid body 10 is formed using such a blank material 50, the first fold margin portion 60 and the second fold margin portion 61 form the side wall portion 13 by shaping the blank material 50.

(Variation 3)
In the lid body 10 according to the first embodiment, as shown in Fig. 3C, the distance H1 from the top surface portion 11 to the lower end of the side wall portion 13 may be uniform (Modification 3). Fig. 3C is a side view for explaining one example of the lid body 10 according to Modification 3 of the first embodiment. In this case, the design of the lid body can be improved, and the lid body 10 can be stably placed on a table or desk even if the lid body 10 is placed on the table or desk with the lower end side of the side wall portion 13 facing downward.

(Variation 4)
In the lid 10 according to the first embodiment, as shown in Fig. 7A, the bent portion 12 is not limited to having a bent shape (having a folded shape), and may have a curved shape. Fig. 7A is a cross-sectional view for explaining one example of the lid according to the modified example 4 of the first embodiment.

In the lid according to the third modified example of the first embodiment, as shown in FIG. 7B, the portion corresponding to the innermost end 63 of the cut portion 54 of the blank material 50 (for convenience of explanation, the same reference number as the innermost end 63 is used in FIG. 7B) may be located slightly below the bent portion 12 as described in the second modified example. FIG. 7B is a cross-sectional view for explaining another example of the lid 10 according to the fourth modified example of the first embodiment. Also, as shown in FIG. 7C, the portion corresponding to the innermost end 63 may be located near the boundary DE between the side wall portion 13 and the top surface portion 11, which is determined at the center of the bent portion 12. In this case, the base end portion 31 of the small wall portion 14 is located inside the bent portion 12 (and below the boundary between the side wall portion 13 and the top surface portion 11).

(Variation 5)
The lid according to the first embodiment may have an identification structure 40 as shown in Fig. 9A to Fig. 9C (Modification 5). Fig. 9A to Fig. 9C are diagrams for explaining one example of the lid 10 according to Modification 5 of the first embodiment. According to the lid 10 according to Modification 5 of the first embodiment, the identification structure 40 is provided, and when the lid 10 according to Modification 5 of the first embodiment is used in a container with a lid 150, the contents in the container 101 can be identified simply by viewing the container with a lid 150 from the outside.

The identification structure 40 includes an identification display section 41 and an identification marker section 42. The identification display section 41 is provided near the outer peripheral end 11A of the top surface section 11 of the lid body 10. In the example of FIG. 9A, a fan-shaped sheet with an identification preparation design 44 such as capital letters H and C or a design is arranged at a predetermined position near the outer peripheral end of the top surface section 11. The identification marker section 42 can be formed by providing an identification marker 43 as an extension from the lower end (front edge section 32) of a predetermined small wall section 14, as shown in FIG. 9B. The identification marker 43 constituting the identification marker section 42 is provided at a position corresponding to the identification marker section 41 in a plan view of the lid body 10. When the identification marker 43 is folded outward, the identification marker 43 can be seen outward from a position corresponding to the description of the identification marker section 41 in a plan view of the lid body 10, as shown in FIG. 9C. By assigning a meaning to the identification design 44, it becomes possible to determine the contents of the container 101 according to the recognition of the identification mark 43 and the recognition content of the identification design 44 corresponding to the recognized identification mark 43. For example, in FIG. 9C, the capital letter H is assigned a meaning of hot drink, and the capital letter C is assigned a meaning of cold drink. When the contents are cold drinks, the identification mark 43 corresponding to the position where the identification design 44 corresponding to the capital letter C is arranged is bent outward, as shown in FIG. 9C, so that the identification mark 43 is easily recognized in a plan view of the lid 10. As a result, even a person who does not know the contents contained in the container 101 can recognize that the contents of the container 101 are cold drinks just by looking at the lidded container 150.

(Variation 6)
The lid according to the first embodiment may have a gripping structure 45 as shown in Fig. 10A to Fig. 10B (Modification 6). Fig. 10A to Fig. 10B are diagrams for explaining an example of the lid 10 according to the modification 6 of the first embodiment. According to the lid 10 according to the modification 6 of the first embodiment, the gripping structure 45 can prevent the top surface 11 or the side wall 13 of the lid 10 from being touched by a human hand and causing contamination of the lid. The gripping structure 45 can be provided as a part (extension part) extended from the lower end of a predetermined small wall part 14, similar to the above-mentioned identification mark part 42. In Fig. 10A and Fig. 10B, the shape of the extension part is formed in a semicircular shape, but this is one example.

(Variation 7)
The cover 10 according to the first embodiment is not limited to the case where the side wall 13 is formed to have a tapered shape in a direction away from the bent portion 12 as described above (downward (-Z direction) in Figs. 1B, 1C, etc.) (Modification 7). For example, as shown in Figs. 12A and 12B, the cover 10 according to the first embodiment may be formed such that the side wall 13 is formed to have a tapered shape from the reference position P1 to the designated position P2, and the portion present from the designated position P2 downward (the lower end 13C of the side wall 13) is formed to have a thickened shape. Note that the reference position P1 indicates the position of the bent portion 12 (the end position of the bent portion 12 on the side wall 13 side when the bent portion 12 has a curved shape), and the designated position P2 indicates a position determined as a position away from the reference position P1 to a predetermined position in the downward direction (-Z direction).

In the lid body 10 according to the seventh modified example of the first embodiment, the side wall portion 13 has a flared shape (a trumpet-shaped shape) (flared portion 66) below the designated position P2. The flared portion 66 thus formed makes it easy to fit the lid body 10 to the container 101.

(Another Example 1)
The cover 10 according to the seventh modification of the first embodiment may be formed so that the side wall portion 13 hangs down perpendicularly to the top surface portion 11 in a direction (-Z direction) away from the bent portion 12, as shown in Fig. 6A. In this case, the bent portion 12 may have a curved structure, as shown in Fig. 17A. Note that even in this case, the flare portion 66 described above with reference to Figs. 12A and 12B may be formed, as shown in Fig. 17D.

(Another Example 2)
The cover 10 according to the seventh modification of the first embodiment may be formed so that the side wall portion 13 is tapered toward the top surface portion 11 in the direction (-Z direction) away from the bent portion 12, as shown in Fig. 6B. In this case, the bent portion 12 may have a curved structure, as shown in Fig. 18A. Note that even in this case, the flare portion 66 described above with reference to Figs. 12 and 12B may be formed, as shown in Fig. 18D.

(Variation 8)
In the lid 10 according to the first embodiment, as shown in Figs. 13A to 13E, the top surface 11 may be processed, or a structure may be added (Modification 8). Figs. 13A to 13E are plan views for explaining one example of the top surface 11 of the lid 10 according to Modification 8 of the first embodiment. As shown in Figs. 13A to 13C, the top surface 11 of the lid 10 may be formed with an air vent hole 16, a through-hole 17 forming a straw insertion port, and a drinking spout forming structure 18 forming a drinking spout. In Fig. 13A, the hole 16 is formed in a circular shape and is a hole that penetrates the surface of the top surface 11 in the thickness direction. In Fig. 13B, the through-hole 17 is formed as a cross-shaped cutout (the center of the cross is connected) in a plan view of the top surface 11, but this is one example. In addition, this cutout that forms the through-hole 17 is a portion that penetrates the top surface 11 in the thickness direction of the top surface 11. In Fig. 13C, the drinking spout-forming structure 18 is formed of a small opening 18A, a small lid portion 18B, a base portion 18D, and a hinge portion 18C. When the small lid portion 18B is lifted from the base portion 18D at the hinge portion 18C, the small opening 18A is exposed. This exposed small opening 18A becomes the drinking spout.

As shown in Figs. 13D and 13E, the top surface 11 may be provided with accessory members such as a tab member 19, a nonwoven fabric 20, and a backing sheet 21. Figs. 13D to 13E are plan views showing one embodiment of the top surface 11. In Fig. 11D, a tab member 19 is provided on the small lid portion 18B of the lid body 10 in Fig. 11C. The small lid portion 18B can be smoothly pulled up by lifting the tab member 19. In Fig. 11E, an opening 23 is formed in a predetermined area of the lid body 10 in Fig. 11C, and a nonwoven fabric 20 is attached so as to cover the opening 23. A backing sheet 21 is provided so as to cover the nonwoven fabric 20. The backing sheet 21 is provided with small holes 22. With this configuration, if the contents stored in the container 101 generate gas such as carbon dioxide, the gas such as carbon dioxide can be appropriately released from the container 101, reducing the risk of the contents leaking out along with the gas, and reducing the risk of the lid 10 unintentionally coming off the container 101 due to the pressure of the gas.

The cover 10 is not limited to having a top surface 11 that is formed in a uniformly flat shape, but may have holes or cuts formed in the top surface 11 that correspond to the hole 16 or through-hole 17, or may have a tab member 19 or nonwoven fabric 20 provided at a predetermined position on the top surface 11.

Therefore, when the blank material for the lid (blank material 50) is said to be in the form of a sheet, this includes cases where holes or cuts corresponding to the hole portions 16 and the through-hole portions 17 are formed in the blank material 50, and also includes cases where the tab members 19, nonwoven fabric 20, etc. are provided at predetermined positions on the blank material 50.

(Another example of Modification 8)
As shown in Figures 13C and 13E, when the drinking spout forming structure 18 is provided on the top surface 11, from the viewpoint of suppressing contamination in the vicinity of the portion that becomes the drinking spout (small opening 18A), it is preferable to provide a designated part identification mark 70 so that the portion (designated part) of the outer peripheral end 11A of the top surface 11, the side wall portion 13, and the bent portion 12 in the lid body 10 that is determined to be in the vicinity of the small opening 18A and the designated excluded part other than the designated part can be distinguished from each other, as shown in Figure 13F. In Figure 13F, the designated part identification mark 70 is provided as a line of a predetermined color along the outer peripheral end 11A of the top surface 11. By providing the designated part identification mark 70, the part where the designated part identification mark 70 is provided can be used as a mark when touching the lid body 10 and handling the lid body 10.

[2. Second embodiment]
As shown in Figures 11A to 11C, the lid 10 according to the second embodiment has the same configuration as that of the first embodiment, except that a convex portion 25 protruding inward (toward the center CT) is formed at a predetermined position on the side wall portion 13. Figures 11A to 11C are views for explaining one example of the lid 10 according to the second embodiment. Except for the configuration of the convex portion 25, the configurations of the top surface portion 11, the side wall portion 13, and the small wall portion 14 in the lid 10 according to the second embodiment are the same as those in the first embodiment, and therefore a description of the configuration common to the first embodiment will be omitted.

(Convex part)
11A to 11C , in the lid 10, a convex portion 25 that protrudes inward (toward the center CT) is formed at a predetermined position on the side wall portion 13. The convex portion 25 is preferably a convex streak portion that is formed in a stripe shape so as to go around the inner circumferential surface 13A of the side wall portion 13.

In the lid 10 according to the second embodiment, as shown in Figs. 11A to 11C, a convex structure of a convex portion 25 is formed on the inner peripheral surface of the side wall portion 13, and a concave portion 24 may be formed on the outer peripheral surface 13B of the side wall portion 13 at a position corresponding to the position where the convex structure is formed. By forming such a structure, the shape of the side wall portion 13 can be further stabilized.

11A to 11C show an example in which the side wall portion 13 has a tapered shape in the downward direction, but the shape of the side wall portion 13 is not limited to this. For example, the lid body 10 according to the second embodiment may be formed so that the side wall portion 13 hangs down perpendicularly to the top surface portion 11 in a direction away from the bent portion 12, as shown in FIG. 17C. Also, as shown in FIG. 18C, the side wall portion 13 may be formed so that it tapers toward the top surface portion 11 in a direction away from the bent portion 12. FIGS. 17C and 18C are cross-sectional views for explaining another example of the lid body 10 according to the second embodiment.

[3. Third embodiment]
[3-1 Configuration of the lid]
As shown in Figures 8A to 8C, the lid 10 according to the third embodiment has the same configuration as that of the first embodiment, except that the bent portion 12 is configured as a protruding portion 26. Figures 8A to 8C are views for explaining one example of the lid 10 according to the third embodiment. In the lid 10 according to the third embodiment, except for the configuration of the protruding portion 26, the configurations of the top surface portion, the side wall portion, and the small wall portion are the same as those of the first embodiment, and therefore a description of the configuration common to the first embodiment will be omitted.

(Protruding part)
In the cover 10, as shown in Fig. 8A to Fig. 8C, a structure (overhanging structure) is formed in which a predetermined region SR1 on the outer peripheral end 11A side of the top surface portion 11 protrudes upward from the center CT. In the examples of Fig. 8A to Fig. 8C, the portion protruding upward from the region SR1 is the overhanging portion 26. In the examples of Fig. 8A to Fig. 8C, the bent portion 12 is defined as being formed by the overhanging portion 26. The center of the bent portion 12 is defined as a position between a position U1 where the bent portion 12 starts to bend outward from the center CT and a position U2 of the outer end of the overhanging portion 26, and this position is defined as the boundary DE between the top surface portion 11 and the side wall portion 13. In the examples of Fig. 8A to Fig. 8C, the boundary DE is defined approximately at the position of the upper end of the overhanging portion 26. In this case, the inner side from the upper end of the overhanging portion 26 is the top surface portion 11, and the outer side from the upper end of the overhanging portion 26 is the side wall portion 13.

The size of the protruding portion 26 is large enough to cover the edge portion 103 of the container 101 and form the recessed portion 27 described below.

(Immersion section)
In the third embodiment, the inner surface 26A side of the protruding portion 26 is a recessed portion (recessed portion 27). The shape of the recessed portion 27 corresponds to the shape of the protruding portion 26. This can be realized according to the shape of a mold used when forming the lid 10 from the blank 50.

(Size of immersion area)
The size of the recessed portion 27 is preferably large enough to fit the edge portion 103 of the container 101. If the recessed portion 27 has such a size, when the lid 10 is used as a lidded container 150, as described later with reference to Fig. 20, the edge portion 103 generally fits into the recessed portion 27, and the outer end portion of the edge portion 103 (the outer peripheral surface portion 111 of the edge portion 103 in the example of Fig. 20) can be brought into surface contact with the recessed portion 27, making it easy to firmly attach the lid 10 to the edge portion 103 of the container 101.

(Small wall section)
The position of the base end 31 of the small wall portion 14 may be at position U2 of the outer end of the projection 26, or it may be slightly below position U2, or it may be above position U2 and below position DE.

8A to 8C show an example in which the side wall portion 13 has a tapered shape in the downward direction, but the shape of the side wall portion 13 is not limited to this. For example, the lid body 10 according to the second embodiment may be formed so that the side wall portion 13 hangs down perpendicularly to the top surface portion 11 in a direction away from the bent portion 12, as shown in FIG. 17B. Also, as shown in FIG. 18B, the side wall portion 13 may be formed so that it tapers toward the top surface portion 11 in a direction away from the bent portion 12. FIGS. 17B and 18B are cross-sectional views for explaining another example of the lid body 10 according to the third embodiment.

[3-3 Actions and Effects]
The lid according to the third embodiment can obtain the same effect as the first embodiment. In addition, in the lid according to the third embodiment, the overhanging portion 26 and the recessed portion 27 are formed at the position of the bent portion 12, and the recessed portion 27 is large enough to receive the edge portion 103 of the container 101 and to come into surface contact with the outer end portion of the edge portion 103. Therefore, the flexibility of the side wall portion 13 near the bent portion 12 (the portion where the overhanging portion 26 is formed) can be further increased, and the difference in flexibility between the side wall portion 13 near the bent portion 12 and the position far from the bent portion 12 can be further increased. Therefore, the lid 10 can be more strongly in contact with the edge portion 103 of the container 101, especially the outer peripheral surface portion, and the side wall portion 13 of the lid 10 can be more strongly engaged with the edge portion 103 of the container 101.

The attachment of the lid 10 to the container 101 will be further described with reference to Figures 26A and 26B. Figure 26A is a cross-sectional view illustrating one embodiment of a state in which the side wall portion 13 of the lid 10 is hooked onto the edge portion 103 of the opening 102 of the container 101. Figure 26B is a cross-sectional view illustrating one embodiment of a state in which the opening 102 of the container 101 is closed by the lid 10.

When the lid body 10 is attached to the container 101, the recessed portion 27 of the lid body 10 is hooked (fitted) to one end of the edge portion 103 of the container 101, and as shown in FIG. 26A, for example, the lid body 10 is bent obliquely upward so as to lift the side wall portion 13 on the side of the end portion (the boundary portion between the top surface portion 11 and the side wall portion 13) formed at the position ST2 farthest from the position ST1 of the hooked end portion (the boundary portion between the top surface portion 11 and the side wall portion 13). FIG. 26A shows the state of the bent lid body 10. Then, while the lid body 10 is bent, the end portion of the lid body 10 is pulled in the direction of the arrow F1 until the inner peripheral surface of the side wall portion 13 of the lid body 10 is in a position near directly above the edge portion 103 of the container 101 (preferably a position slightly outside the edge portion 103) (at this time, the edge portion 103 of the container 101 may be deformed slightly inward). Then, the side wall 13 is pushed down in the direction of the arrow V1. At this time, the deflection of the lid 10 is gradually released, and the outer peripheral surface 111 of the edge 103 is hooked (fitted) into the recessed portion 27 of the lid 10.

26B, when the lid 10 is fitted to the edge 103 of the container 101, the edge 103 of the container 101 can apply stress T to the lid 10 in the outward direction. The lid 10 receives stress T from the container 101, but due to the shape retention force of the overlapping portion 30 of the side wall 13 of the lid 10, the lower end of the side wall 13 tends to wrap around the underside of the edge 103 as shown by arrows F2 and F3. This makes it easier to form a state in which the edge 103 of the container 101 is embraced by the side wall 13, the top surface 11, and the bent portion 12, and the lid 10 and the container 101 can be more firmly attached to each other. When the lid body 10 according to the third embodiment is attached to the container 101, the recessed portion 27 is likely to come into surface contact with the outer peripheral surface portion 111 of the edge portion 103, but a gap 114 is generated between the recessed portion 27 and the edge portion 103 from the upper end 112 of the edge portion 103 to the inside (inner peripheral surface portion 113). Furthermore, in the third embodiment, when the overhanging portion 26 is extended, the action of its recovery force further improves the adhesion between the lid body 10 and the outer peripheral surface of the edge portion 103 of the container 101. In addition, the top surface portion 11 is likely to be subjected to a force in the inward direction as shown by the arrows F1A and F1B, which also makes the gap 114 more likely to be formed, but the effect of suppressing the risk of the lid body 10 being detached from the container 101 is enhanced by the action of the shape retention force of the overlapping portion 30 of the side wall portion 13 of the lid body 10, and the adhesion between the lid body 10 and the outer peripheral surface of the edge portion 103 of the container 101 is also likely to be improved. This effect is particularly enhanced when the lid 10 is made of a paper-based material, since the shape retention of the side wall 13 is particularly improved. Note that FIG. 28B shows an enlarged view of the main part, which is an enlargement of the area surrounded by a dashed line in accordance with the cross-sectional view of the lid 10, and the dashed line MC drawn in thin lines in the enlarged view of the main part indicates a straight line that passes through the upper end 112 and extends in the vertical direction.

In order to easily ensure a state similar to that in which the lid 10 described herein is attached to the container 101, it is preferable that the top surface 11 is positioned at the same level as or below the upper end of the protruding portion 26, as shown in FIG. 26B, etc.

[3-2 Modifications of the lid]
(Variation 1)
In the cover 10 according to the third embodiment, the protruding direction (protruding direction) of the overhanging portion 26 is a direction from the top surface portion 11 toward the upper side (+Z direction) in FIG. 8A, but as shown in FIG. 14A to FIG. 14C, it may be a direction toward the outer side (direction away from the center CT) of a predetermined region SR2 on the upper end side of the side wall portion 13 from the top surface portion 11 (Modification 1). FIG. 14A to FIG. 14C are diagrams for explaining the cover according to Modification 1 of the third embodiment. In the examples of FIG. 14A to FIG. 14C, the part protruding laterally from the region SR2 in this way is the overhanging portion 26. In the examples of FIG. 14A to FIG. 14C, as described above, the bending portion 12 is defined as being formed by the overhanging portion 26. The center of the bending portion 12 is defined as a position between the position U1 where the bending portion 12 starts to bend downward and the position U2 of the lower end of the overhanging portion 26, and this position is defined as the boundary DE between the top surface portion 11 and the side wall portion 13. 8A to 8C, the boundary DE is determined to be approximately at the position of the outer end of the overhanging portion 26. In this case, the upper side from the outer end of the overhanging portion 26 constitutes the top surface portion 11, and the lower side from the outer end of the overhanging portion 26 constitutes the side wall portion 13. Even in this case, the inner surface 26A side of the overhanging portion 26 is a sunken portion (sunken portion 27).

(Variation 2)
In FIG. 8A, the protruding portion 26 is a portion that forms a structure protruding in an upward direction from the top surface portion 11, but as shown in FIG. 15A to FIG. 15B, it may be a portion that forms a structure (a structure bulging outward) in which a predetermined region SR1 on the outer peripheral end 11A side of the top surface portion 11 protrudes upward and a predetermined region SR2 on the upper end side of the side wall portion 13 protrudes in a direction toward the outside from the center CT (a structure bulging outward). FIG. 15A to FIG. 15B are diagrams for explaining a lid according to a second modification of the third embodiment. In the example of FIG. 15A to FIG. 15B, the portion that protrudes upward from the region SR1 and the region SR2 protrudes outward in this way (a portion that forms a structure bulging outward) is the protruding portion 26. In the example of FIG. 15A to FIG. 15B, as described above, the bent portion 12 is defined as being formed by the protruding portion. The center of the bending portion 12 is determined to be an intermediate position between a position U1 where the bending starts to proceed upwards in a position close to the center CT in region SR1 along the overhanging portion 26, and a position U2 at the lower end of the overhanging portion 26 in region SR2, and this position is determined as the boundary DE between the top surface portion 11 and the side wall portion 13. In this case, the portion extending from the position DE designated for the overhanging portion 26 toward the center CT constitutes the top surface portion 11, and the portion below the position DE designated for the overhanging portion 26 constitutes the side wall portion 13. Even in this case, the inner surface 26A side of the overhanging portion 26 is a sunken portion (sunken portion 27).

(Variation 3)
In the lid body 10 according to the third embodiment, as shown in FIG. 24, a drinking spout forming structure 18 may be provided on the top surface portion 11 (Modification 3). FIG. 24 is a plan view for explaining one example of Modification 3 of the third embodiment. In the example of FIG. 24, as explained in Modification 8 of the first embodiment using FIG. 13, the drinking spout forming structure 18 is formed of a small opening 18A, a small lid portion 18B, a base portion 18D, and a hinge portion 18C. When the small lid portion 18B is lifted from the base portion 18D by the hinge portion 18C, the small opening 18A is exposed. This exposed small opening 18A becomes the drinking spout. In this case, as shown in FIG. 24, it is preferable that the drinking spout of the small opening 18A is formed inside the inner end of the protruding portion 26. In this case, the protrusion 26 prevents the liquid taken in from the small opening 18A, which serves as the drinking spout, from spilling outside the lid body 10, and since the outer surface of the protrusion 26 near the outer peripheral end 11A of the top surface 11 is gently sloping, the contents that tend to spill outward from the upper surface of the top surface 11 of the lid body can be returned from the sloping surface back toward the drinking spout (small opening 18A), reducing the risk of the edges of the upper surface (exposed surface) of the lid body 10 and its vicinity becoming soiled by spilling contents.

[4. Fourth embodiment]
[4-1 Configuration of the lid]
As shown in Fig. 21A to Fig. 21C, the cover 10 according to the fourth embodiment has the same configuration as that of the third embodiment, except that the bent portion 12 is formed by the overhanging portion 26, and a convex portion 25 is formed at or near the end of the overhanging portion 26 that is closer to the side wall portion. Fig. 21A to Fig. 21C are diagrams for explaining one example of the cover 10 according to the fourth embodiment. In the cover 10 according to the third embodiment, the configurations of the top surface portion, the side wall portion, and the small wall portion, etc. are the same as those of the first embodiment, except for the configuration of the overhanging portion 26, so a description of the configuration common to the first embodiment will be omitted.

(Convex part)
The convex portion 25 is similar to that shown in the second embodiment, except that it is formed at or near the end 28 of the overhanging portion 26, which is closer to the side wall portion 13, as shown in Figures 21A to 21C as described above. Figures 21A to 21C show an example in which the convex portion 25 is formed so as to be continuous with the end 28A of the overhanging portion 26 on the side wall portion 13 of the lid body 10 according to the second modified example of the third embodiment. In addition, in Figures 21A to 21C, the reference numeral 28B indicates the end portion of the end 28 of the overhanging portion 26 on the top surface portion 11 side. As shown in Figure 21A, the convex portion 25 is formed in a continuous ring shape along the outer peripheral surface of the lid body 10, but it is not prohibited that there may be a part where the convex portion 25 is not formed. However, from the viewpoint of making the lid body 10 more closely surface-contact with the container 101, it is preferable that the convex portion 25 is formed in a continuous ring shape on the outer peripheral surface of the side wall portion 13.

It is preferable that the degree (size) of inward protrusion of the protrusion 25 is large enough to face the underside of the edge 103 of the container 101 when attached to the lid 10 and the container 101. Furthermore, the protrusion 25 may be large enough to contact the outer peripheral surface of the side wall 104 of the container body 110 of the container 101 when attached to the lid 10 and the container 101.

21A to 21C, the shape of the side wall 13 below the convex portion 25 (the -Z direction side in Figs. 21B and 21C) is formed in a shape such that its cross-sectional diameter (cross-sectional diameter of the transverse section) becomes smaller toward the bottom (tapered shape). This is one example, and the shape of the side wall 13 below the convex portion 25 may be a shape such that its cross-sectional diameter (cross-sectional diameter of the transverse section) is constant toward the bottom (drooping shape, non-tapered shape), or a shape such that its cross-sectional diameter (cross-sectional diameter of the transverse section) becomes larger toward the bottom (tip-thin shape). However, from the viewpoint of making the lid 10 come into closer surface contact with the container 101, it is preferable that the shape of the side wall 13 below the convex portion 25 be tapered. Furthermore, if the shape of the side wall 13 below the convex portion 25 is a tapered shape, the portion of the side wall 13 below the convex portion 25 and the convex portion 25 as a whole may also serve as the flare portion 66 as described in the seventh modification of the first embodiment.

The attachment of the lid 10 to the container 101 will be further described with reference to FIG. 27. FIG. 27 is a cross-sectional view for explaining an example of a state in which the opening 102 of the container 101 is closed by the lid 10. The lid 10 according to the fourth embodiment can be attached to the edge 103 of the container 101 in the same manner as described in the third embodiment with reference to FIGS. 26A and 26B. However, in the fourth embodiment, as shown in FIG. 27, the inner side of the convex portion 25 faces the lower side of the edge 103 and is in surface contact with it. Then, from the upper end of the edge 103 to the inside (the opening 102 side), the lid 10 and the edge 103 are generally spaced apart. This is thought to be because, when the lid 10 is attached to the container 101, a pulling force acts inward on the top surface 11 due to the shape stability (resistance to stretching) of the overlapping portion 30 of the side wall portion 13. In addition, due to the shape stability of the overlapping portion 30 of the side wall portion 13, the inner surface of the protruding portion 26 (recessed portion 27) and the convex portion 25 can stably form a surface contact state in which they encase the outer peripheral side portion 111 of the edge portion 103.

[5. Fifth embodiment]
[5-1 Configuration of the lid]
23A and 23B, the lid 10 according to the fifth embodiment is formed in the same manner as the third or fourth embodiment, except that the bent portion 12 is formed by a protruding portion 26, and an uneven portion is formed in the recessed portion 27 of the inner surface 26A of the protruding portion 26, at least outside the position defined as the boundary between the side wall portion 13 and the top surface portion 11. Figures 23A and 23B show an example in which an uneven portion 71 is further formed on the lid 10 of the fourth embodiment.

(Unevenness)
In the lid 10 according to the fifth embodiment, the uneven portion 71 is composed of a combination of a plurality of convex portions 72 and concave portions 73. The shapes of the convex portions 72 and the concave portions 73 are not particularly limited, and from the viewpoint of more strongly suppressing the risk of the contents leaking from inside the container 101 through the opposing portion between the lid 10 and the edge portion 103 of the container 101 when the lid 10 is used as a container with a lid 150, it is preferable that the convex portions 72 and the concave portions 73 are each formed in a stripe shape (line shape) that becomes a ring that continues in the circumferential direction of the recessed portion 27, as shown in Figures 23A and 23B, so that the uneven portion is a stripe-shaped uneven portion. In this case, when the recessed portion 27 is viewed in vertical section, the uneven portion is formed in a wave shape, which makes it easy to contact the edge portion 103 of the container 101 at multiple points, and the risk of the contents of the container 101 leaking from the opposing portion between the lid body 10 and the edge portion 103 of the container 101 can be more strongly suppressed. However, this does not prohibit cases other than the case where the uneven portion is a stripe-shaped uneven portion. Although the uneven portion 71 is configured as an embossed uneven portion in Figures 23A and 23B, the shaping structure of the uneven portion is not limited to this.

In the lid body 10 according to the fifth embodiment, when the uneven portion 71 is formed in the fourth embodiment as shown in Figures 23A and 23B, the uneven portion 71 may also be formed in the portion of the protrusion 25 that faces the edge portion 103 when the lid body 10 is attached to the container 101.

[6. Sixth embodiment]
[6-1 Configuration of the lid]
As shown in Figures 22A and 22B, the cover 10 according to the sixth embodiment has the same configuration as any one of the third to fifth embodiments, except that the top surface 11 has a shape curved upward (a curved portion 74 is formed on the top surface 11). The example of Figures 22A and 22B shows an example of the fourth embodiment in which the top surface 11 has a shape curved upward.

As explained in the third embodiment, in the sixth embodiment, when the lid body 10 is attached to the container 101, the recessed portion 27 of the lid body 10 is hooked (fitted) to one end of the edge portion 103 of the container 101, and the lid body 10 is bent so as to bend in an upward diagonal direction so as to lift the side wall portion 13 of the lid body 10 at the end side farther from the position of the hooked end. Furthermore, the lid body 10 is pulled to fit the entire side wall portion 13 of the lid body 10 to the edge portion 103 of the container 101. However, according to the fifth embodiment, the top surface portion 11 is formed with the curved portion 74, so that the top surface portion 11 has a shape curved upward. Therefore, even if the lid body 10 is pulled outward while being bent in an upward diagonal direction, and the top surface portion 11 is stretched and expanded, the top surface portion 11 can follow the stretch and change its shape. In order to easily ensure in the sixth embodiment a state in which the lid 10 is attached to the container 101 as described in the third embodiment, it is preferable that the upper end of the curved portion 74 be located at the same position as or below the upper end of the protruding portion 26, as shown in Figures 22A and 22B.

[7. Application Examples]
(Application Example 1)
The lid 10 described above can be used in a container with a lid 150 as shown in Figures 19A and 19B. Figure 19A is a diagram showing an example in which the lid 10 according to the first embodiment is attached to an edge 103 that forms the outer periphery of an opening 102 of a container 101 having an opening 102 formed at the upper end. In this example, an example in which the lid 10 is engaged with the edge 103 is shown. Figure 19B is a cross-sectional view that typically shows the state of the vertical cross section taken along line K-K in Figure 19A. The explanation of the container with a lid 150 will be continued with reference to Figures 19A and 19B.

(Container with lid)
The container with lid 150 has a contact portion 151 where the container 101 and the lid 10 are in contact with each other, and the region of the lid 10 forming the contact portion 151 is the contact region R. The method of joining the lid 10 and the container 101 is not particularly limited, and any joining method such as a crimping method or a heat fusion method (heat sealing) can be appropriately used. In the following, an example will be described in which the lid 10 according to the first embodiment is used for the container with lid 150.

The container 101 has a container body 110 having a cylindrical side wall 104 and a bottom 107 that have a diameter that increases toward the top (tapering toward the bottom), forming a space 105 inside, and an opening 102 that opens at the upper end of the container body 110 (the upper end of the side wall 104). Although not shown, the opening 102 of the container 101 is formed in a circular shape. However, the container 101 shown here is an example, and does not limit the configuration of the container 101. For example, the opening 102 of the container 101 may be formed in a rectangular shape. The container 101 may be any one that can cover the opening 102 with the lid 10. However, in such a case, it is preferable that the shape of the lid 10 is made to match the shape of the container 101 (for example, rectangular).

In the container 101 shown in Figures 19A, 19B, etc., the edge 103 of the opening 102 has a flange portion. The flange portion may be a curled portion 108 formed by outwardly winding the member forming the container body 110, or may be formed as a portion (brim portion) that extends outward in a plane.

The contents stored inside the container 101 (space 105) are not particularly limited, and can be, for example, liquids, solids, or a combination of both, but the lid of the present invention is particularly effective when the contents are fluids such as liquids. In other words, when the contents are fluids such as liquids, if there is an error in the dimensions of the container and the adhesion between the container and the lid is lost, the fluid will leak out of the container, so it is particularly important that the lid of the present invention can be securely attached to the container even if there is an error in the dimensions of the container.

In the container 150 with lid, the contact area R is formed on the underside of the top surface (the surface facing the container) near the outer periphery of the top surface. It is also preferable that the contact area R is also formed on the side wall. In the example of Figures 19A and 19B, the contact area R is formed on both the top surface and the side wall. The contact area R of the top surface is easily maintained by forming the contact area R on the side wall as well (the presence of the contact area R on the side wall can generate friction between the side wall and the container, making it difficult for the top surface and the container to separate). Furthermore, the contact area R is formed on the top surface, which prevents the contents contained in the space 105 of the container 101 from leaking out to the outside.

(Application Example 2)
In the case where the lid 10 has a protruding portion like the lid 10 of the third embodiment, the rim 103 of the container may be disposed in the recess 27 formed on the inner surface 26A side of the protruding portion 26 of the lid-equipped container 150 as shown in Fig. 20. Fig. 20 is a cross-sectional view for explaining a state in which the lid 10 of the third embodiment is fitted to the container 101. In this case, the contact area between the rim 103 and the lid 10 can be enlarged, so that the adhesion between the lid 10 and the container 101 is less likely to be impaired, and the problem of the fluid leaking from the container 101 can be suppressed.

(Application Example 3)
The lid 10 of the present invention may be combined with a container 101 having an opening 102 .

As explained above, the present invention can be applied to many such aspects. It can also be applied to other aspects of stores and methods of providing packaging materials. The above describes the lid body according to the present invention in detail, but the above are merely examples of the lid body according to the present invention and are not limited to these. Therefore, appropriate modifications may be made within the scope of the gist of the present invention. In addition, the configurations of the above-mentioned inventions may be used independently in each example, or may be applied in appropriate combination.

Based on the above description of this specification, the present invention may adopt the configurations shown in the following [E1] to [E11].
[E1]
configured to be attachable to a container having an opening and an edge defining the opening;
The container has a top surface portion that covers the opening when the container is attached, and a side wall portion that is formed in an annular shape along an outer periphery of the top surface portion,
A curved portion is provided on an outer peripheral edge of the top surface portion, and a plurality of small wall portions are provided which are connected to the top surface portion via the curved portion formed so as to surround the periphery of the top surface portion,
the bent portion forms a boundary between the top surface portion and the side wall portion,
The side wall portion has a structure formed by a plurality of the small wall portions, and has an overlapping portion in which adjacent small wall portions partially overlap each other,
A small wall joint portion that joins adjacent small wall portions is formed in the overlapping portion.
Lid body.
[E2]
The small wall portion has an inner surface facing the container when attached to the container, and an outer surface opposite to the inner surface,
When the adjacent small wall portions are a first small wall portion and a second small wall portion, the small wall joint portion has a structure in which the inner surface portion of the first small wall portion and the outer surface portion of the second small wall portion are joined together.
The lid body described in [E1] above.
[E3]
The small wall portion has a base end and a front edge,
At least a portion of the small wall portion has a width greater at the front edge than at the base end.
The lid body according to the above [E1] or [E2].
[E4]
The side wall portion is tapered from the bent portion toward the lower end of the side wall portion.
A lid body according to any one of the above [E1] to [E3].
[E5]
The small wall portion has a base end and a front edge,
The width of the small wall joint portion has a portion that increases from the base end portion of the small wall portion toward the front end edge portion.
A lid body according to any one of [E1] to [E4] above.
[E6]
The side wall portion and the curved portion have a paper-based material.
A lid body according to any one of the above [E1] to [E5].
[E7]
The small wall portion has a resin layer.
A lid body according to any one of [E1] to [E6] above.
[E8]
A blank material for forming the lid body according to any one of [E1] to [E7] above,
A first corresponding portion corresponding to the top surface portion and a second corresponding portion formed in a shape corresponding to the side wall portion,
Blank material for lid body.
[E9]
The blank material is formed of a circular sheet material,
The second corresponding portion has a notch extending inward from an outer circumferential edge of the sheet material,
When the lid body is formed, a portion between adjacent cut portions corresponds to the small wall portion.
The lid body blank material according to [E8] above.
[E10]
A lid body according to any one of the above [E1] to [E7],
the container having the opening and the edge forming the opening;
A combination of a lid and a container.
[E11]
A lid body according to any one of the above [E1] to [E7],
the container having the opening and the edge forming the opening;
The lid body described above is attached to the container.
Container with lid.

10: Lid 11: Top surface 11A: Outer peripheral end 12: Curved portion 13: Side wall 13A: Inner peripheral surface 13B: Outer peripheral surface 13C: Lower end 14: Small wall 14A: First small wall 14B: Second small wall 14C: Third small wall 15: Small wall joint 16: Hole 17: Through portion 18: Mouth forming structure 18A: Small opening 18B: Small lid 18C: Hinge portion 18D: Base portion 19: Tab member 20: Nonwoven fabric 21: Backing sheet 22: Small hole 23: Opening 24: Recess 25: Convex portion 26: Protruding portion 26A: Inner surface 27: Recessed portion 28: End 30: Overlap portion 31: Base end 31A: End 31B: End 32 : Front edge portion 33 : Side end portion 33A : First side end portion 33B : Second side end portion 34 : Inner surface portion 35 : Outer surface portion 36 : Extended wall portion 40 : Identification structure 41 : Identification display portion 42 : Identification mark portion 43 : Identification mark 44 : Identification preparation design 45 : Grip structure 50 : Blank material 51 : Folding margin portion 52 : First corresponding portion 53 : Second corresponding portion 54 : Cut-out portion 55 : Sheet material 56 : Notch portion 57 : Half-cut portion 60 : First folding margin portion 61 : Second folding margin portion 63 : Back end 64 : Outward protrusion portion 65 : Crushing structure portion 66 : Flare portion 70 : Designated portion identification mark 101 : Container 102 : Opening 103 : Edge portion 104 : Side wall 105 : Space portion 107 : Bottom portion 108 : Curled portion 110 : Container body 111 : Outer peripheral portion 112 : Upper end 113 : Inner peripheral portion 114 : Gap 150 : Container with lid 151 : Contact portion CB : Center CT : Center D : Arrow DE : Boundary FD : Arrow F1 : Arrow F1A : Arrow F2 : Arrow F3 : Arrow H1 : Distance P1 : Reference position P2 : Designated position PD1 : State PD2 : State PD3 : State R : Contact area SR1 : Area SR2 : Area T : Stress V1 : Arrow WK : Area

Claims (11)

configured to be attachable to a container having an opening and an edge defining the opening;
The container has a top surface portion that covers the opening when the container is attached, and a side wall portion that is formed in an annular shape along an outer periphery of the top surface portion,
A curved portion is provided on an outer periphery of the top surface portion, and a plurality of small wall portions are provided which are connected to the top surface portion via the curved portion so as to surround the periphery of the top surface portion,
the bent portion forms a boundary between the top surface portion and the side wall portion,
The side wall portion has a structure formed by a plurality of the small wall portions, and has an overlapping portion in which adjacent small wall portions partially overlap each other,
A small wall joint portion that joins adjacent small wall portions is formed in the overlapping portion.
Lid body. The small wall portion has an inner surface portion facing the container when attached to the container, and an outer surface portion that is the opposite surface to the inner surface,
When the adjacent small wall portions are a first small wall portion and a second small wall portion, the small wall joint portion is
The outer surface of the first small wall portion and the inner surface of the second small wall portion are joined together.
The lid according to claim 1 . The small wall portion has a base end and a front edge,
At least a portion of the small wall portion has a width greater at the front edge than at the base end.
The lid according to claim 1 . The side wall portion is tapered from the bent portion toward the lower end of the side wall portion.
The lid according to claim 1 . The small wall portion has a base end and a front edge,
The width of the small wall joint portion has a portion that increases from the base end portion of the small wall portion toward the front end edge portion.
The lid according to claim 1 . The side wall portion and the curved portion have a paper-based material.
The lid according to claim 1 . The small wall portion has a resin layer.
The lid according to claim 1 . A blank for forming the lid according to claim 1,
A first corresponding portion corresponding to the top surface portion and a second corresponding portion formed in a shape corresponding to the side wall portion,
Blank material for lid body. The blank material is formed of a circular sheet material,
The second corresponding portion has a notch extending inward from an outer circumferential edge of the sheet material,
When the lid body is formed, a portion between adjacent cut portions corresponds to the small wall portion.
A closure blank according to claim 8. The lid according to claim 1 ,
the container having the opening and the edge forming the opening;
A combination of a lid and a container. The lid according to claim 1 ,
the container having the opening and the edge forming the opening;
The lid is attached to the container.
Container with lid.

Images