Lid body, blank material for lid body, combination of lid body and container, and container with lid body

Abstract

When mass-producing lid bodies, the present invention realizes production of lid bodies efficiently at a low cost.　This lid body is configured so as to be attachable to a container having an opening and a rim that forms the opening, and comprises: a top surface part that covers the opening when attached to the container; and a side wall part formed into an annular shape along the outer circumferential edge of the top surface part. At the outer circumferential edge of the top surface part, a bent part and a plurality of small wall parts connected to the top surface part with the bent part therebetween so as to surround the circumference of the top surface part are provided. The bent part forms a boundary between the top surface part and the side wall part. The side wall part has a structure formed of the small wall parts, and has overlapping portions where adjacent ones of the small wall parts partially overlap. In the overlapping portions, small-wall joining sections that join adjacent ones of the neighboring small wall parts are formed.

Description

Lid, lid blank, lid and container combination, and container with lid

[0001] The present invention relates to a lid, a lid blank, a combination of a lid and a container, and a container with a lid.

[0002] It is common practice in 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, a rim that defines the opening, and a space formed behind the opening. When providing the contents to customers, the containers are often provided with lids attached. In this case, the lids are attached to the containers with the contents contained therein, so that the contents are often provided in a lidded container (encased in packaging).

[0003] A known lid has a top surface and a side wall surrounding the top surface. When a container with a lid is made, the side wall of the lid is fitted to the edge of the container. Conventionally, lids made of molded plastic have been widely used. An example of a lid made of molded plastic is disclosed in Patent Document 1 below. This lid is formed by injecting molten resin into a mold, a process known as in-mold molding.

[0004] Japanese Patent Application Laid-Open No. 2022-121473

[0005] However, the lid disclosed in the above-mentioned Patent Document 1 has problems such as the equipment required to form the lid being large-scale and the equipment costs being high. Also, the lid disclosed in Patent Document 1 tends to require a large number of steps to form the lid, such as injecting a molten resin material into a mold, then removing the resin after it has solidified, and further removing unnecessary parts from the molded lid, which may result in a long time required to form the lid.

[0006] Generally, lids are required to be mass-produced, so even a slight increase in the time it takes to form one lid results in a huge loss of time when considering the total number of lids to be formed, making it difficult to mass-produce lids.

[0007] Therefore, when producing a large number of lids, there is room for improvement in terms of producing lids efficiently and at low cost.

[0008] The present invention is summarized as follows (1) to (20).

[0009] (1) A lid configured to be attached to a container having an opening and an edge that forms the opening, and having a top surface that covers the opening when attached to the container, and a side wall formed in a ring shape along the outer periphery of the top surface, a bent portion at the outer periphery 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, wherein the bent portion forms a boundary between the top surface and the side wall portion, and the side wall portion has a structure formed by the plurality of small wall portions and has an overlap portion where 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 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 opposite the inner surface, and when adjacent small wall portions are defined as a first small wall portion and a second small wall portion, the small wall joint has a structure in which the outer surface of the first small wall portion is joined to the inner surface of the second small wall portion. (3) The lid 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 larger at the front edge than at the base end. (4) The lid described in (1) above, wherein the side wall portion tapers from the bent portion toward the lower end of the side wall portion. (5) The lid described in (1) above, wherein the side wall portion tapers from the bent portion toward the lower end of the side wall portion. (6) The lid according to (1) above, wherein the small wall portion has a base end and a front edge portion, and the width of the small wall joint portion increases from the base end of the small wall portion toward the front edge portion. (7) The lid according to (1) above, wherein the side wall portion and the curved portion are made of a resin film member. (8) The lid according to (1) above, wherein the small wall portion is made of a resin film member. (9) The lid according to (1) above, wherein the side wall portion, the curved portion, and the small wall portion are made of a resin film member. (10) The lid according to (1) above, wherein the curved portion is formed by a protruding portion. (11) The lid according to (10) above, wherein a convex portion is formed that is continuous with the end of the protruding portion and protrudes in a direction from the outer peripheral surface of the side wall portion toward the inner peripheral surface.(12) The lid according to (1) above, in which a fiber-containing sheet is disposed on the underside of the top surface portion. (13) The lid according to (10) above, in which a fiber-containing sheet is disposed on the inner surface of the protruding portion. (14) The lid according to (1) above, in which a fiber-containing sheet is disposed so as to connect the adjacent small wall portions. (15) A lid blank according to (1) above, which is a blank for forming the lid according to (1) above, comprising 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. (16) The lid blank according to (15) above, which is formed from a circular sheet material, and the second corresponding portion has a cut portion extending inward from the outer periphery of the sheet material, and when the lid is formed, the portion between the adjacent cut portions corresponds to the small wall portion. (17) A lid blank according to (16) above, wherein a fiber-containing sheet is disposed on the sheet material, and the sheet material and the fiber-containing sheet are partially bonded. (18) A lid blank according to (17) above, wherein the fiber-containing sheet is formed in a gear shape. (19) A combination of a lid and a container, comprising the lid according to (1) above and the container having the opening and the edge forming the opening. (20) A lid-equipped container, comprising the lid according to (1) above and the container having the opening and the edge forming the opening, and having a structure in which the lid is attached to the container.

[0010] According to the present invention, it is possible to efficiently and inexpensively produce lids using resin sheets, lid blanks, combinations of lids and containers, and lid-equipped containers.

[0011] FIG. 1A is a plan view illustrating an example of a lid according to the first embodiment. FIG. 1B is a side view illustrating an example of a lid according to the first embodiment. FIG. 1C is a cross-sectional view schematically illustrating a vertical cross section taken along line A-A in FIG. 1A. FIG. 1D is a cross-sectional view schematically illustrating a vertical cross section taken along line B-B in FIG. 1B. FIG. 2A is a plan view illustrating an example of a blank for forming a lid according to the first embodiment. FIG. 2B is a cross-sectional view schematically illustrating a vertical cross section taken along line C-C in FIG. 2A. FIG. 2C is a diagram illustrating an example of a process for shaping the blank. FIG. 2D is a diagram illustrating the blank in FIG. 2C when viewed from the direction of arrow D. FIGS. 3A to 3D are plan views illustrating modified examples of the lid according to the first embodiment. FIG. 4A is a plan view illustrating another example of a blank. FIG. 4B is a cross-sectional view schematically illustrating a vertical cross section taken along line E-E in FIG. 4A. FIG. 5A is a plan view illustrating another example of a blank. FIG. 5B is a cross-sectional view illustrating another example of a blank. FIGS. 6A and 6B are cross-sectional views illustrating an example of a lid according to the first embodiment. FIGS. 7A, 7B, and 7C are cross-sectional views illustrating an example of a lid according to the first embodiment. FIG. 8A is a plan view illustrating an example of a lid according to the third embodiment. FIG. 8B is a side view illustrating an example of a lid according to the third embodiment. FIG. 8C is a cross-sectional view schematically illustrating a vertical cross section taken along line F-F in FIG. 8A. FIG. 9A is a plan view illustrating an example of a lid according to the first embodiment. FIG. 9B is a side view illustrating an example of a lid according to the first embodiment. FIG. 9C is a plan view illustrating an example of a use state of the lid shown in FIG. 9A. FIG. 10A is a plan view illustrating an example of a lid according to the first embodiment. FIG. 10B is a side view illustrating an example of a lid according to the first embodiment. FIG. 11A is a plan view illustrating an example of a lid according to the second embodiment. Fig. 11B is a side view for explaining an example of the lid according to the second embodiment, and Fig. 11C is a cross-sectional view schematically showing the state of the vertical cross section taken along line GG in Fig. 11A.FIG. 12A is a plan view illustrating an example of a lid according to the first embodiment. FIG. 12B is a cross-sectional view schematically illustrating a vertical cross section taken along line H-H in FIG. 12A. FIGS. 13A, 13B, 13C, 13D, 13E, 13F, and 13G are plan views illustrating an example of a lid according to the first embodiment. FIG. 14A is a plan view illustrating an example of a lid according to the third embodiment. FIG. 14B is a side view illustrating an example of a lid according to the third embodiment. FIG. 14C is a cross-sectional view schematically illustrating a vertical cross section taken along line I-I in FIG. 14A. FIG. 15A is a plan view illustrating an example of a lid according to the third embodiment. FIG. 15B is a cross-sectional view schematically illustrating a vertical cross section taken along line J-J in FIG. 15A. FIG. 16 is a view illustrating an example of a process in which a blank is shaped. FIGS. 17A and 17D are cross-sectional views illustrating an example of a lid according to the first embodiment. FIG. 17B is a cross-sectional view illustrating an example of a lid according to the third embodiment. FIG. 17C is a cross-sectional view illustrating an example of a lid according to the second embodiment. FIGS. 18A and 18D are cross-sectional views illustrating an example of a lid according to the first embodiment. FIG. 18B is a cross-sectional view illustrating an example of a lid according to the third embodiment. FIG. 18C is a cross-sectional view illustrating an example of a lid according to the second embodiment. FIG. 19A is a perspective view illustrating an example of a lidded container. FIG. 19B is a cross-sectional view schematically illustrating a vertical cross section taken along line K-K in FIG. 19A. FIG. 20 is a partial cross-sectional view illustrating an example of a lidded container in which the lid has a protruding portion. FIG. 21A is a plan view illustrating an example of a lid according to the fourth embodiment. FIG. 21B is a side view illustrating an example of a lid according to the fourth embodiment. FIG. 21C is a cross-sectional view schematically illustrating a vertical cross section taken along line L-L in FIG. 21A. FIG. 22 is a side view illustrating 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, and Fig. 24 is a plan view for explaining an example of a third modification of the third embodiment.25A and 25B are cross-sectional views illustrating an example of a state in which a lid according to the first embodiment is attached to a container. FIG. 26A is a cross-sectional view illustrating an example of a state in which a lid according to the third embodiment is attached to a container. FIG. 26B is a cross-sectional view and a partially enlarged cross-sectional view illustrating an example of a state in which a lid according to the third embodiment is attached to a container. FIG. 27 is a partial cross-sectional view illustrating an example of a state in which a lid according to the fourth embodiment is attached to a container. FIG. 28A is a plan view illustrating an example of a first example of Modification 9 of the first embodiment. FIG. 28B is a cross-sectional view schematically illustrating a vertical cross section taken along line M-M in FIG. 28A. FIG. 29A is a plan view illustrating an example of a second example of Modification 9 of the first embodiment. FIG. 29B is a cross-sectional view schematically illustrating a vertical cross section taken along line N-N in FIG. 29A. FIG. 30A is a plan view illustrating an example of a third example of Modification 9 of the first embodiment. FIG. 30B is a cross-sectional view schematically illustrating a vertical cross section taken along line O-O in FIG. 30A. FIG. 31A is a plan view illustrating an example of a tenth modified example of the first embodiment. FIG. 31B is a cross-sectional view schematically illustrating a vertical cross section taken along line P-P in FIG. 31A. FIG. 32A is a plan view illustrating a fiber-containing sheet used in an example of a tenth modified example of the first embodiment. FIG. 32B is a bottom view illustrating a blank used in an example of a tenth modified example of the first embodiment. FIG. 33 is a side view illustrating an example of a tenth modified example of the first embodiment. FIG. 34A is a plan view illustrating an example of a lid according to the seventh embodiment. FIG. 34B is a cross-sectional view schematically illustrating a vertical cross section taken along line Q-Q in FIG. 34A. FIG. 35A is a plan view illustrating an example of a lid according to a first modified example of the seventh embodiment. FIG. 35B is a cross-sectional view schematically illustrating a vertical cross section taken along line R-R in FIG. 35A. FIG. 35C is a partially enlarged cross-sectional view schematically illustrating an enlarged portion of region EI surrounded by a dashed dotted line in FIG. 35B. Fig. 36A is a plan view illustrating an example of a lid according to Modification 2 of the seventh embodiment. Fig. 36B is a cross-sectional view schematically illustrating a state of a vertical cross section taken along line S-S in Fig. 36A. Fig. 36C is a side view illustrating an example of a lid according to Modification 2 of the seventh embodiment.FIG. 37A is a plan view illustrating an example of a lid according to Modification 3 of the seventh embodiment. FIG. 37B is a cross-sectional view schematically illustrating a vertical section taken along line T-T in FIG. 37A. FIG. 38A is a bottom view illustrating an example of a blank that can be used to manufacture an example of a lid according to Modification 3 of the seventh embodiment. FIG. 38B is a cross-sectional view schematically illustrating a vertical section taken along line U-U in FIG. 38A. FIGS. 39A to 39C are enlarged plan views illustrating an example of a fiber-containing sheet. FIGS. 40A and 40B are cross-sectional views illustrating an example of a lid according to the seventh embodiment. FIG. 41 is a partial cross-sectional view illustrating an example of a state in which a lid according to the seventh embodiment is attached to a container. FIG. 42A is a perspective view illustrating overlapping portions of small wall portions in an example of the first embodiment. FIG. 42B is a plan view schematically illustrating the state when FIG. 42A is viewed from the inside to the outside. FIG. 42C is a cross-sectional view schematically illustrating the state of a vertical section taken along line A1-A1 in FIG. 42B. FIG. 43A is a perspective view illustrating overlapping portions of small wall portions in an example of a lid according to Modification 11 of the first embodiment. FIG. 43B is a plan view schematically illustrating the state when FIG. 43A is viewed with the inward / outward direction as the viewing direction. FIG. 43C is a cross-sectional view schematically illustrating the state of a vertical section taken along line A2-A2 in FIG. 43B. FIG. 44A is a perspective view illustrating overlapping portions of small wall portions in an example of a lid according to Modification 12 of the first embodiment. FIG. 44B is a plan view schematically illustrating the state when FIG. 44A is viewed with the inward / outward direction as the viewing direction. FIG. 44C is a cross-sectional view schematically illustrating the state of a vertical section taken along line A3-A3 in FIG. 44B. FIGS. 45A to 45C are diagrams illustrating an example of a blank for manufacturing a lid according to the first embodiment. FIG. 46A is a perspective view illustrating overlapping portions of small wall portions in an example of a lid according to Modification 13 of the first embodiment. Fig. 46B is a plan view schematically showing the state when Fig. 46A is viewed with the inward and outward directions as the line of sight. Fig. 46C is a cross-sectional view schematically showing the state of a longitudinal section taken along line A4-A4 in Fig. 46B. Fig. 47 is a diagram showing an example of a blank for manufacturing a lid according to Modification 13 of the first embodiment. Fig. 48A is a cross-sectional view for explaining a lid according to Modification 12 of the first embodiment.Fig. 48B is a cross-sectional view illustrating an example of a lid obtained by applying Modification 12 of the first embodiment to the seventh embodiment. Fig. 48C is a cross-sectional view illustrating a lid according to Modification 4 of the seventh embodiment. Figs. 49A and 49B are plan views illustrating an example of a blank for manufacturing the lid of the first embodiment.

[0012] An example of the present invention will be described below with reference to the drawings. The description will be given in the following order: 1. First embodiment, 2. Second embodiment, 3. Third embodiment, 4. Fourth embodiment, 5. Fifth embodiment, 6. Sixth embodiment, 7. Seventh embodiment, and 8. Application example. In this specification and the drawings, components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0013] The following description is of a preferred specific example of the present invention, and the content of the present invention is not limited to the described embodiments. Furthermore, in the following description, directions such as front-to-back, left-to-right, and up-down are indicated for the sake of convenience, but the content of the present invention is not limited to these directions. In the examples of FIGS. 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-to-back direction (front side is the +X direction, rear side is the -X direction), and the Y-axis direction is the left-to-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 FIGS. 3 to 49.

[0014] The relative size and thickness ratios of each layer shown in each drawing, such as Figure 1, are shown for convenience and do not limit the actual size ratios. The definitions of these directions and size ratios also apply to each drawing, such as Figures 2 to 49.

[0015] The lid of the present invention will be described using an example of a lid used for a container (cup) for holding a fluid, such as a coffee cup or other beverage. However, the lid is not limited to a lid for a beverage container and can also be used for a container for holding food products other than beverages. The lid of the present invention can also be used for containers that can hold various items other than food and beverages, such as parts such as bolts and nuts, or items other than those listed above. Furthermore, while the lid of the present invention will be described below using an example of a lid that is circular in plan view, the shape of the lid is not limited to a circular shape in plan view and can be applied to various shapes other than a circle, such as an ellipse, a polygonal shape (e.g., a triangle), a chamfered rectangle, or a chamfered polygon. However, from the perspective of further enhancing the effects of the present invention, it is preferable that the lid be attached to a container that holds a fluid. The term "fluid" is intended to include not only fluid materials such as liquids and powders, but also a combination of liquids and solids.

[0016] [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 the edge 103 of the opening 102 of the container 101, as will be described later using Figure 19 etc. The lid 10 is formed so that it can form a contact region R that contacts the edge 103 of the container 101 having the opening 102.

[0017] As shown in Figures 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 curved portion 12. Figures 1A to 1D are views for explaining one embodiment of the lid 10. Although the container 101 is not prohibited from being a container with little or no flexibility, such as a metal container, 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. From the viewpoint of enhancing the effect of using the lid 10 of the present invention, it is preferable to use a paper-based material, as the material for the container 101, as described below for the material of the lid 10, etc.

[0018] 1A to 1D , the top surface 11 is a portion that covers the opening 102 of the container 101 when the lid 10 is attached (mounted) to 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.

[0019] (Bending Portion) The bending 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 bending 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 10 is attached to the container 101. In the examples shown in FIGS. 1A to 1D , the bending portion 12 has a bent structure, but as will be described later, the bending portion 12 is not limited to having a bent structure. Furthermore, 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 the boundary and a case where a boundary is defined inside or at the 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 bending portion 12). 1A to 1D, the curved portion 12 is formed at the boundary between the top surface 11 and the side wall 13, and the top surface 11 and the side wall 13 are defined by the curved portion 12. The boundary between the top surface 11 and the side wall 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 configured by a portion specified by the curved range, and the boundary between the top surface 11 and the side wall 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.

[0020] (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 (described later) and an overlapping portion 30 where adjacent small wall portions 14 partially overlap. The overlapping portion 30 has a small wall joint portion 15 that joins adjacent small wall portions 14.

[0021] 1A to 1D, the overall shape of the side wall portion 13 is tapered in the vertical direction from the bending 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 10, a cross section of the side wall portion 13 (a cross section of the side wall portion 13 that can also be seen when the side wall portion 13 is cut along a plane parallel to the XY plane) is formed inside the cross section of the side wall portion 13 near the bending portion 12 at a predetermined position below the bending portion 12; in the examples of FIGS. 1A to 1D, the cross section of the side wall portion 13 is formed to become smaller the further away from the bending portion 12 it is. The shape of the side wall portion 13 may be a shape for the inner peripheral surface 13A of the side wall portion 13 or a shape for the outer peripheral 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.

[0022] (Small Wall Portion) 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. Each small wall portion 14 has 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 an example.

[0023] The outer periphery of each small wall portion 14, excluding the base end portion 31 and the front end portion 32, forms a 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). However, it is preferable that one side end portion 33 of adjacent small wall portions 14 and the other side end portion 33 facing that side end portion 33 be parallel to each other in a blank 50 (described later). In the example of FIG. 1, the side end portion 33 is formed linearly in a plan view of the blank 50 (described later) extending outward (in the radial direction of the blank 50) from the center of the blank 50 (position CB in FIG. 2). The small wall portion 14 is composed of individual fold margins 51 in the blank 50 (described later). In the example of FIG. 2A, when the blank 50 is shaped to form the lid 10 of FIG. 1A, the center CB of the blank 50 is approximately the same as the center CT of the lid 10.

[0024] The small wall portions 14 are formed to surround the outer peripheral edge 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 curved portion 12. 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 of the small wall portions 14 aligned in the circumferential direction of the top surface portion 11. For example, of the side end portions 33 of the small wall portions 14, the side end portion 33 on the −X direction side in FIG. 1B is defined as the first side end portion 33A, and the side end portion 33 on the +X direction side is defined as the second side end portion 33B (the first side end portion 33A and the second side end portion 33B are defined so that the direction from the first side end portion 33A toward the second side end portion 33B when viewing the side end portions 33 of the small wall portions 14 coincides with the clockwise direction around the circumferential direction of the top surface portion 11). 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 just an example and does not limit the overlapping structure of adjacent small wall portions 14.

[0025] 1, the small wall portion 14 has an inner surface portion 34 that faces the container 101 when attached thereto, and an outer surface portion 35 that faces the opposite side of 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.

[0026] 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 of the small wall portion 14 is greater at the front edge than at the base end. In this case, as shown in the example of Figure 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 fan shape.

[0027] The small wall portion 14 preferably has a resin layer (preferably a thermoplastic resin layer) formed on the surface of at least one side of the inner surface portion 34 and the outer surface portion 35. In this case, the small wall joint portion 15 can be easily formed in the overlapping portion 30 by performing a heat treatment, ultrasonic welding, or the like when forming the lid body 10 from the blank piece 50 described below. 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 piece 50). Specific examples of the sheet material include those having a laminate structure of a layer formed of a paper-based material (e.g., paper) and a resin layer (e.g., coated paper).

[0028] (Overlapping portion) 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 Figures 1A to 1D, as described above, if, of the surfaces constituting the small wall portions 14, the surface facing the container 101 when attached to the container 101 is defined as the inner surface portion 34, and the surface opposite 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.

[0029] The overlapping portion 30 preferably has a portion where its width increases from the base end 31 toward the front edge 32 of the small wall 14. In the examples shown in FIGS. 1A to 1D , the overlapping portion 30 has a shape where the width WK of the overlapping portion 30 gradually increases from the base end 31 toward the front edge 32 of the small wall 14. Forming the overlapping portion 30 in this manner facilitates forming the formation region of the small wall joint 15 (described later) to be similar to the overlapping portion 30, thereby facilitating the formation of 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 a straight line M connecting the two ends 31A, 31B of the base end 31 of the small wall 14.

[0030] In the lid body 10 according to the first embodiment, as shown in Figures 42A to 42C, the overlapping portion (overlapping portion 30) of adjacent small wall portions 14 may be formed in the region between the side end portion 33 of one of the adjacent small wall portions 14 and the side end portion 33 of the other small wall portion 14 when the line of sight is in the inward / outward direction (the direction from the inner surface 13A of the side wall portion 13 toward the outer surface 13B is the outward direction), and the side end portion 33 may form part of the outline of the overlapping portion 30. In the examples of Figures 42A to 42C, the overlapping portion 30 is formed in a region surrounded by the second side end portion 33B of the first small wall portion 14A, the first side end portion 33A of the second small wall portion 14B, and the front edge portion 32 when the line of sight is from the outer peripheral surface 13B of the side wall portion 13 toward the inner peripheral surface 13A. Figure 42A is a perspective view illustrating the overlapping portion of the small wall portions 14. Note that, for convenience of explanation, Figure 42A illustrates only two small wall portions 14, and the other small wall portions 14 are omitted. This also applies to Figure 42B and Figures 43A, 43B, 44A, and 44B described below. Figure 42B is a plan view schematically illustrating the state when Figure 42A is viewed from the inside out. FIG. 42C is a cross-sectional view schematically showing the state of a vertical cross section taken along line A1-A1 in FIG. 42B.

[0031] 42A and 42B , the positional relationship between the two side ends 33 that define the overlapping portion 30 may be such that the two side ends 33 that define the overlapping portion 30 are twisted from the distal end 38 toward the proximal end 37 in a predetermined section from the vicinity of the proximal end 37 to the proximal end 37. In Fig. 42A , the side end face that forms the first side end 33A is twisted from the distal end 38 toward the proximal end 37 so as to be directed toward the inner surface 34 of the first small wall portion 14A. Furthermore, the side end face that forms the second side end 33B is twisted from the distal end 38 toward the proximal end 37 so as to be directed toward the outer surface 35 of the second small wall portion 14B. 42B and 42C , in the example of Fig. 42A , it is possible to generally avoid forming a state in which the inner surface portions 34 of the first small wall portions 14A face each other in the inward / outward direction and a state in which the outer surface portions 35 of the small wall portions 14 face each other in the inward / outward direction at the base end 37. Note that in the examples shown in Figs. 42A to 43 , it is possible to form a state in which the inner surface portions 34 of the first small wall portions 14A face each other in the circumferential direction (the circumferential direction of the side wall portions 13) or a state in which the outer surface portions 35 of the small wall portions 14 face each other in the circumferential direction (the circumferential direction of the side wall portions 13). In this case, a pleated structure (vertical pleat structure 67) extending toward the center of the top surface portion 11 may be formed locally near the base end 37. In this case, however, the vertical pleat structure 67 may be at least partially (or entirely) eliminated by compressing the blank 50 at the base end 37 by pressing or the like when manufacturing the lid 10. In the example of Figures 42A to 42C, the overlapping portion 30 includes the base end 37 of the side end portion 33.

[0032] (Small Wall Joint) In the overlapping portion 30, the opposing surfaces of the small walls 14 constituting the overlapping portion 30 are joined together, forming the small wall joint 15. In the example shown in FIGS. 1A to 1D, this joint is defined as the joint between the outer surface 35 of the first small wall 14A and the inner surface 34 of the second small wall 14B. The formation of the small wall joint 15 prevents adjacent small walls 14 from moving freely relative to each other, facilitating the stabilization of the overall shape of the side wall 13. In particular, unlike conventional wrinkled structures such as fine wrinkles or creases formed by densely packing the blank material through shaping, the small wall joint 15 is a surface-jointed portion, which facilitates the stabilization of the shape of the side wall 13. Note that this does not prohibit the formation of a conventional wrinkled structure in addition to the small wall joint 15.

[0033] The formation area of ​​the small wall joint 15 is not particularly limited, as long as it is an area that can prevent the small wall 14 constituting the side wall 13 from freely rotating about the base end 31. However, from the viewpoint of maintaining the shape stability of the lid 10, making it difficult for the side wall 13 to deform at positions far from the bend 12 (positions close to the lower end of the side wall 13), and allowing the side wall 13 to deform relatively closer to the bend 12 than to the lower end of the side wall 13, it is preferable that the width WD of the small wall joint 15 has a portion that increases from the bend 12 toward the front end of the small wall 14. In this case, it is preferable that the formation area of ​​the overlapping portion 30 be the same. In this case, the overlapping portion 30 and the small wall joint 15 can be formed substantially simultaneously by subjecting the overlapping portion 30 to a heat fusion treatment (heat treatment, etc.) or ultrasonic welding treatment in conjunction with the formation of the overlapping portion 30. The width of the small wall joint 15 (width WD in FIG. 1 ) refers to the length of the region along the surface of the small wall joint 15 in the direction parallel to the above-mentioned straight line M. The structure in which the opposing surfaces of the small wall portions 14 that form the small wall joint 15 are joined together is formed as a part by fixing the small wall portions 14 by adhesive or the like. Specifically, an adhesive or resin (thermoplastic resin) may be placed on at least one of the opposing small wall portions 14 in a portion that corresponds to at least a part of the overlapping portion 30, and the part may be fixed via the adhesive or resin.

[0034] 1A to 1D, the width WD of the small wall joint 15 gradually increases from the base end 31 toward the front edge 32 of the small wall 14. An example of the formation region of such a small wall joint 15 is a generally fan-shaped formation region (a shape in which two fan shapes are partially overlapped).

[0035] (Lid Material) The material of the lid 10, i.e., the material of the top surface 11, side wall 13, and curved portion 12, is not particularly limited, and examples thereof include paper-based materials, plastics, metals, etc., but paper-based materials and plastics are preferred. In particular, if the side wall 13 and curved portion 12 are made of a paper-based material, this is preferred from the viewpoint of achieving both shape retention and environmental friendliness, and it is more preferred that the entire lid 10 be made of a paper-based material. Examples of paper-based materials include so-called paper, which is obtained by weaving a slurry of a fiber raw material onto a screen, drying or pressing it, and making it into a sheet; so-called airlaid sheets, which are obtained by stacking spread fiber raw materials such as ground pulp obtained by pulverizing a raw material sheet made of pulp-based fibers or the like in 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; chemical fiber paper, synthetic paper, waterproof paper, coated paper, substitute paper, parchment, wool paper, glass fiber paper, stone paper, ceramic paper, etc.; and materials made by laminating multiple sheets of these. Furthermore, paper-based materials may be those made only of pulp or may contain fibers such as non-pulp natural fibers, synthetic fibers, and recycled fibers. However, the paper-based material preferably contains 50% by mass or more of pulp, more preferably 70% by mass or more, and even more preferably 80% by mass or more, with 100% by mass of pulp being particularly preferred. Paper-based materials can be composites of synthetic resin or natural resin films, nonwoven fabrics, wood-based materials such as wood foil, and even aluminum foil. However, when using composite materials, the composite material preferably contains 50% or more by mass of pulp, and more preferably 80% or more by mass of pulp. A higher pulp content is preferable because the paper-based material is more biodegradable. The lid 10 can also be preferably made of a laminate containing a paper-based material. Furthermore, when plastic is used as the lid 10, it is preferable to use a sheet-shaped resin sheet material. Plastic refers to any synthetic resin with plasticity, such as polyethylene (PE), polypropylene (PP), PET, ABS, polystyrene, rayon, polyvinyl chloride, EVAC, PVAL, PVDC, PTFE, and silicone.Furthermore, when a resin sheet is used as the material for the lid 10, it is also preferable that the sheet has light-transmitting properties.

[0036] 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 using a molding device or the like to deform (shape) the lid blank into a shape corresponding to the shape of the lid 10. In this specification, the lid blank may be simply referred to as a blank.

[0037] (Lid Blank) The lid blank (blank 50) is a blank 50 that corresponds to the lid 10. For example, the blank 50 for the lid 10 shown in the examples 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. Note that when the blank 50 is sheet-like, it includes blanks that have holes 16, tab members 19, etc., provided at positions corresponding to the shape and configuration of the lid 10, as will be described later.

[0038] 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.

[0039] An example of a blank 50 corresponding to the lid 10 shown in FIG. 1A is one formed from a circular sheet material 55, as shown in FIG. 2A . The blank 50 has multiple cuts 54 extending inward from the outer periphery of the sheet material 55. In the example of FIG. 2A , the portion between adjacent cuts 54 along the outer periphery of the sheet material 55 forms a fold margin 51 that is bent when the blank 50 is shaped. A portion formed by a combination (assembly) of the fold margins 51 forms a second corresponding portion 53. When the fold margin 51 is bent in the direction of arrow FD as shown in FIG. 2B , the fold margin 51 forms the minor wall 14 (or forms part of the minor wall) when the blank 50 is transformed into the lid 10. In addition, when the blank 50 is folded at a predetermined position further toward the center than the rear end 63 of the notch 54, a blank 50 such as that shown in FIG. 5A can be used. The folding margins are composed of multiple first folding margins 60 sandwiched between adjacent notches and second folding margins 61 extending further back (toward the center of the blank 50) than the first folding margins 60 (from the outer edge of the sheet material 55 to the folding axis). The first folding margins 60 extend outward from the second folding margins 61. The second corresponding portion 53 is formed by a combination of multiple first folding margins 60 and the second folding margins 61. The overlapping portion 30 is formed by the overlapping structure of the first folding margins 60. The small wall portion 14 is also formed by the first folding margins 60.

[0040] (Another example 1 of lid blank) The lid blank (blank 50) is not limited to the structure shown in FIG. 2A and may have, for example, cutouts 56 instead of the cutouts 54, as shown in FIGS. 4A and 4B. In this example, the portion between adjacent cutouts 56 becomes the folding margin 51. The cutouts 56 may be used in combination with the cutouts 54. As shown in FIG. 4A, the cutouts 56 are formed so as to be smaller than the portion that is expected to become the overlapping portion 30 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 formed when the lid 10 is manufactured and the portion that falls outside the overlapping portion 30.

[0041] (Another example 2 of 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 Fig. 5B. In this case, the portions between adjacent half-cut portions 57 become folding margins. The half-cut portions 57 may be used in combination with the cut portions 54.

[0042] (Alternative Example 3 of Lid Blank) The lid blank is not limited to the structure shown in Figure 2, and for example, as shown in Figures 49A and 49B, the cuts 54 are not limited to being straight, but may be formed in a curved shape (Figure 49A). Furthermore, the cuts 54 are not limited to being formed in a line cut toward the center, but may be formed in a line cut in a direction away from the center (Figure 49B). Figures 49A and 49B are plan views for explaining one embodiment of Alternative Example 3 of the lid blank.

[0043] (Lid Manufacturing Method) The lid 10 can be manufactured, for example, by forming a blank 50 into a shape corresponding to the shape of the lid 10 using a lid molding device or the like. An example of the lid molding 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 , forming an overlapping structure (overlapped portion 30) between adjacent folding margins 51 as shown in FIG. 4C . Conditions such as the width of the overlapped portion 30 can be determined by adjusting the mold shape, the control of the lid molding device, etc. By forming the blank 50, the first corresponding portion 52 becomes the top surface 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.

[0044] In addition, 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 mold and the female mold is a separable mold from the viewpoint of realizing mold clamping.

[0045] Furthermore, from the viewpoint of forming the minor wall joints 15 simultaneously with the shaping, it is preferable that the lid body forming device be provided with a joining mechanism for forming the minor wall joints 15. Examples of joining mechanisms include a heating mechanism configured to perform a heat treatment that heats at least a portion of the overlapping portion 30, and an ultrasonic welding mechanism configured to perform an ultrasonic welding treatment on a portion of the overlapping portion 30. For example, consider a case where a circular sheet of coated paper (e.g., a structure in which a resin layer is laminated on paper) is used as the blank material 50, and where cuts 54 are formed from the outer periphery of the coated paper toward the inside as shown in FIG. 2A , and the portion sandwiched between adjacent cuts 54 is the fold margin 51. In this case, when the fold margin 51 is formed into the minor wall portion 14 by the lid body forming device, the resin layer is exposed on one surface of the opposing faces of the adjacent minor wall portions 14 in the overlapping portion 30. Therefore, by operating the joining mechanism as described above in accordance with the shaping of the blank material 50, the surfaces of the opposing small wall portions 14 can be joined by the resin layer at the overlapping portion 30, and a small wall joint portion 15 can be formed.

[0046] [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 connected to 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 50. Adjacent small wall portions 14 are surface-joined by forming small wall joints 15 at overlapping portions 30, and the larger the width WD of the small wall joints 15, the greater the joining strength can be. In the lid of the present invention, the width WD of the small wall joints 15 is smaller near the bend 12 (because there is less overlapping and fixed portion), so the side wall portion 13 near the bend 12 can be relatively more flexible than the portion farther from the bend 12. This makes it possible to temporarily deform the shape of the top surface portion 11 and the bend 12, making it easy to temporarily apply a deformation force to the lid 10 and fit the lid 10 to the container 101, even if the dimensions of the container 101 vary. Furthermore, the width WD of the small wall joint 15 at a position of the side wall 13 far from the bending portion 12 (a position closer to the bottom end) is larger than the width WD at a position closer to the bending portion 12, thereby stabilizing the shape of the side wall 13. Therefore, even if the shape of the top surface 11 or the bending portion 12 is temporarily deformed, a restoring force acts more easily, and the shape of the side wall 13 can be restored more easily.

[0047] Furthermore, because the lid of the present invention has small wall joints 15 that extend in the surface direction (circumferential direction) of side wall 13, the risk of side wall 13 irreversibly expanding outward can be reduced compared to conventional lids having a pleated or wrinkled structure on the side wall, even when a force that expands in the surface direction acts on side wall 13. In other words, when lid 10 is attached to a container 101 that is slightly larger than the size of inner circumferential surface 13A of side wall 13 of lid 10, even if a force that expands side wall 13 (a force that expands side wall 13 in the circumferential direction) acts on side wall 13 of lid 10, side wall 13 is less likely to irreversibly expand, making it easier to maintain lid 10 firmly attached to container 101 and reducing the risk of side wall 13 of lid 10 unintentionally expanding and compromising the airtightness of lidded container 150.

[0048] In conventional lids having a crease or wrinkle-like structure in the side wall portion, the members constituting the side wall portion are continuous (there are no or few breaks) where the wrinkles are formed. In the lid of the present invention, adjacent small wall portions 14 are cut, and in side wall portion 13, the side end faces of small wall portions 14 form the side edges of overlapping portion 30. Therefore, when a lid of the present invention is formed that has the same cross-sectional diameter as a conventional lid having a crease or wrinkle-like structure in the side wall portion, if the total area of ​​the face-to-face contact region where the members constituting the side wall portion of the conventional lid come into face-to-face contact with each other (the face-to-face contact region where the wrinkles or creases are formed) is defined as ARA1 and the total area of ​​the overlapping portion 30 in the lid of the present invention is defined as ARA2, ARA2 will be larger than ARA1. In other words, the total area of ​​the small wall joint 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 body, and in this respect, the lid body of the present invention can stabilize the shape of the side wall portion 13 more than conventional lid bodies.

[0049] 25A and 25B will be used to further describe the attachment of the lid 10 to the container 101. Fig. 25A is a cross-sectional view illustrating an embodiment in which the side wall 13 of the lid 10 is hooked onto the edge 103 of the opening 102 of the container 101. Fig. 25B is a cross-sectional view illustrating an embodiment in which the opening 102 of the container 101 is closed by the lid 10.

[0050] When attaching the lid 10 to the container 101, for example, the side wall 13 and the top surface 11 of the lid 10 are hooked onto one end of the edge 103 of the container 101, and the lid 10 is bent obliquely upward so as to lift the side wall 13 at the end (the boundary between the top surface 11 and the side wall 13) of the lid 10 formed at a position away from the hooked end (the boundary between the top surface 11 and the side wall 13) at position ST1. In FIG. 25A , the dashed line indicates a state PD1 of the lid 10 when it is not bent, and the solid line indicates a state PD2 of the lid 10 when it is bent. Then, while the lid 10 is being bent, the end portion of the lid 10 on the side of position ST2 is pulled in the direction of arrow F1 until the lower end 13C of the side wall 13 of the lid 10 is positioned slightly outward from directly above the edge 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 arrow V1. At this time, the deflection of the lid 10 is gradually eliminated. At this time, the latched end of the lid 10 (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 shape-retaining force at the overlapping portion 30 of the side wall 13 of the lid 10 acts to easily hold the edge 103 of the container 101 between the side wall 13, the top surface 11, and the bent portion 12. This makes it easier for the lower end of the side wall 13 to wrap around under the edge 103 as shown by arrow F2, thereby achieving stronger adhesion between the lid 10 and the container 101.

[0051] 25B , when the lid 10 is in a state PD3 where it is externally fitted onto the edge 103 of the container 101, the edge 103 of the container 101 can apply a stress T outward to the lid 10. Regarding the overall adhesion between the lid 10 and the container 101, the lid 10 is subjected to the stress T from the container 101, but the shape-retaining force of the overlapping portion 30 of the side wall 13 of the lid 10 makes it easier for the side wall 13, the top surface 11, and the bent portion 12 to embrace the edge 103 of the container 101, and the lower end of the side wall 13 tends to wrap around under the edge 103 as indicated by arrows F2 and F3, thereby enabling the lid 10 and the container 101 to be more tightly adhered to each other. Furthermore, although the top surface 11 is more likely to be subjected to inward force as indicated by arrows F1A and F1B, the shape retention force of the overlapping portions 30 of the side walls 13 of the lid 10 acts to more effectively prevent the lid 10 from detaching from 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 walls 13 is particularly improved.

[0052] 1-4 Modifications of the Lid (Modification 1) In the lid according to the first embodiment, as shown in FIGS. 3A and 3D , the overlapping structure of adjacent small wall portions 14 forming the overlapping portion 30 may be different from the example shown in FIG. 1 (Modification 1). FIGS. 3A and 3D are side views illustrating an example of a 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 positioned 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 , 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 in a plan view of the lid body 10 (shown as the line of sight from the +Z direction side to the −Z direction side), the two side end portions 33, 33 of the first small wall portion 14A and the third small wall portion 14C are positioned on the inner peripheral surface 13A side of the side wall portion 13. In the overlapping portion 30, the outer surface 35 of the first small wall portion 14A and the inner surface 34 of the second small wall portion 14B partially face each other, and the outer surface 35 of the third small wall portion 14C and the inner surface 34 of the second small wall portion 14B partially face each other, so that the second small wall portion 14B sandwiched between the first small wall portion 14A and the third small wall portion 14C has two side ends 33, 33 exposed on the outer peripheral surface 13B side of the side wall portion 13.

[0053] (Variation 2) In the lid 10 according to the first embodiment, as shown in FIG. 3B , the base end 31 of the small wall 14, which can roughly correspond to a position on a line connecting the inner ends of the cutouts 54 of the blank 50, may be located slightly below the bent portion 12 (Variation 2). FIG. 3B is a side view illustrating an example of a lid according to Variation 2 of the first embodiment. In this case, the side wall 13 includes the small wall 14, and an extension wall 36 is formed between the small wall 14 and the top surface 11 (between the small wall 14 and the bent portion 12 in the example of FIG. 3B ) so as to connect the small wall 14 and the top surface 11 (connecting the small wall 14 and the bent portion 12 in FIG. 3B ). In this case, when the blank 50 is shaped into the lid 10, the inner end 63 of the cutout 54 may be slightly protruded outward (an outward protrusion 64), as shown in FIG. 16 . FIG. 16 is a plan view showing an embodiment of the blank 50 bent at the second corresponding portion 53 (bent toward the −Z side). The structure of this outward protrusion 64 may be left as is, or may be crushed by a pair of dies to form a crushing structure 65, as shown in FIG. 3B . At this time, wrinkles or creases may be formed in the crushing structure 65. By forming wrinkles or creases in the crushing structure 65, when an outward force is applied to the lid 10 near the bending portion 12 when attaching the lid 10 to the container 101, the bending portion 12 can be slightly stretched (deformed in a manner that stretches out the wrinkles in the portion near the bending portion 12), thereby preventing the entire lid 10 from being destroyed.

[0054] The blank 50 of the lid 10 according to the second modification of the first embodiment may be, for example, as described with reference to FIG. 5A , a blank 50 in which the second corresponding portion 53 is configured with a folding margin portion (first folding margin portion 60) formed between the notches 54 and a second folding margin portion 61 formed contiguous to the first folding margin portion 60 and on the inside. The second folding margin portion 61 is formed in an annular shape, and each first folding margin portion 60 extends outward from the outer periphery of the second folding margin portion 61. When the lid 10 is formed using such a blank 50, the first folding margin portion 60 and the second folding margin portion 61 form the side wall portion 13 by shaping the blank 50.

[0055] (Variation 3) In the lid body 10 according to the first embodiment, the distance H1 from the top surface 11 to the lower end of the side wall portion 13 may be uniform, as shown in Fig. 3C (Variation 3). Fig. 3C is a side view illustrating an example of the lid body 10 according to Variation 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 when placed on the table or desk with the lower end of the side wall portion 13 facing downward.

[0056] (Modification 4) In the lid 10 according to the first embodiment, the bending portion 12 is not limited to having a bent shape (having a folded shape) and may have a curved shape, as shown in Fig. 7A . Fig. 7A is a cross-sectional view illustrating an example of a lid according to Modification 4 of the first embodiment.

[0057] In the lid according to the third modification 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 50 (for convenience of explanation, the portion is designated by the same reference numeral as the innermost end 63 in FIG. 7B ) may be located slightly below the bent portion 12, as described in the second modification. FIG. 7B is a cross-sectional view illustrating another example of the lid 10 according to the fourth modification 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 defined 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).

[0058] (Variation 5) The lid according to the first embodiment may have an identification structure 40 as shown in Figures 9A to 9C (Variation 5). Figures 9A to 9C are diagrams for explaining one example of the lid 10 according to Variation 5 of the first embodiment. According to the lid 10 according to Variation 5 of the first embodiment, the identification structure 40 is provided, and when used in a lidded container 150, the contents in the container 101 can be identified simply by viewing the lidded container 150 from the outside.

[0059] The identification structure 40 includes an identification display portion 41 and an identification marker portion 42. The identification display portion 41 is provided near the outer peripheral edge 11A of the top surface 11 of the lid 10. In the example shown in FIG. 9A , an identification design 44, such as capital letters H and C or a design, is arranged on a fan-shaped sheet at a predetermined position near the outer peripheral edge of the top surface 11. As shown in FIG. 9B , the identification marker portion 42 can be formed by providing an identification marker 43 as an extension from the lower end (front edge portion 32) of a predetermined small wall portion 14. The identification marker 43 constituting the identification marker portion 42 is provided at a position corresponding to the identification marker portion 41 in a plan view of the lid 10. When the identification marker 43 is folded outward, the identification marker 43 becomes visible outward from a position corresponding to the markings on the identification marker portion 41 in a plan view of the lid 10, as shown in FIG. 9C . By assigning meanings to the identification designs 44, it becomes possible to determine the contents of the container 101 based on 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. If the contents are a cold drink, the identification mark 43 corresponding to the position where the identification design 44 corresponding to the capital letter C is arranged is bent outward, making the identification mark 43 easier to recognize in a plan view of the lid 10, as shown in FIG. 9C . This allows even a person who is unfamiliar with the contents of the container 101 to recognize that the contents of the container 101 are a cold drink just by looking at the lidded container 150.

[0060] (Variation 6) The lid according to the first embodiment may have a gripping structure 45, as shown in FIGS. 10A and 10B (Variation 6). FIGS. 10A and 10B are diagrams illustrating an example of the lid 10 according to Variation 6 of the first embodiment. The lid 10 according to Variation 6 of the first embodiment includes the gripping structure 45, which minimizes the risk of contamination of the lid caused by human contact with the top surface 11 or side wall 13 of the lid 10. The gripping structure 45 can be provided as an extension (extension) from the lower end of a predetermined small wall portion 14, similar to the above-described identification mark 42. While the extension is shown in a semicircular shape in FIGS. 10A and 10B, this is merely an example.

[0061] (Variation 7) The lid body 10 according to the first embodiment is not limited to the case where the side wall portion 13 is formed to have a tapered shape in a direction away from the bending portion 12 (downward (-Z direction) in Figures 1B and 1C, etc.) as described above (Variation 7). In the lid body 10 according to the first embodiment, for example, as shown in Figures 12A and 12B, the side wall portion 13 may be formed to have a tapered shape from the reference position P1 to the designated position P2, and the portion located below the designated position P2 (the lower end 13C of the side wall portion 13) may be formed to have a wider shape. Note that the reference position P1 indicates the position of the bending portion 12 (or, if the bending portion 12 has a curved shape, the end position of the bending portion 12 on the side wall portion 13 side), and the designated position P2 indicates a position determined as a predetermined position away from the reference position P1 in the downward direction (-Z direction).

[0062] In the lid 10 according to the seventh modification of the first embodiment, the side wall 13 has a flared portion (flared portion 66) below the designated position P2. The flared portion 66 makes it easy to fit the lid 10 to the container 101.

[0063] (Modification 1) As shown in Fig. 6A, the lid 10 according to Modification 7 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 away from the bending portion 12 (-Z direction). In this case, as shown in Fig. 17A, the bending portion 12 may have a curved structure. Note that even in this case, the flared portion 66 described above with reference to Figs. 12A and 12B may be formed, as shown in Fig. 17D.

[0064] (Modification 2) As shown in Fig. 6B, the lid 10 according to Modification 7 of the first embodiment may be formed so that the side wall portion 13 tapers toward the top surface portion 11 in the direction away from the bending portion 12 (-Z direction). In this case, as shown in Fig. 18A, the bending portion 12 may have a curved structure. Note that even in this case, the flared portion 66 described above with reference to Figs. 12 and 12B may be formed, as shown in Fig. 18D.

[0065] (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 (Variation 8). FIGS. 13A to 13E are plan views illustrating an example of the top surface 11 of the lid 10 according to Variation 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 for forming a straw insertion port, or a drinking spout structure 18 for forming a drinking spout. In FIG. 13A , the hole 16 is formed in a circular shape and 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 (connecting the center of the cross) in a plan view of the top surface 11, but this is just one example. The cutouts that form the through-holes 17 penetrate the top surface 11 in the thickness direction of the top surface 11. In Figure 13C, the drinking spout-forming structure 18 is made up of a small opening 18A, a small lid 18B, a base 18D, and a hinge 18C. When the small lid 18B is lifted from the base 18D by the hinge 18C, the small opening 18A is exposed. This exposed small opening 18A becomes the drinking spout.

[0066] Furthermore, as shown in Figures 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. Figures 13D and 13E are plan views showing one embodiment of the top surface 11. In Figure 11D, a tab member 19 is provided on the small lid portion 18B of the lid body 10 of Figure 11C. By lifting the tab member 19, the small lid portion 18B can be smoothly lifted. In Figure 11E, an opening 23 is formed in a predetermined area of ​​the lid body 10 of Figure 11C, and a nonwoven fabric 20 is attached to cover the opening 23. A backing sheet 21 is provided to cover the nonwoven fabric 20. Small holes 22 are formed in the backing sheet 21. With such a configuration, if the contents stored in the container 101 generate gas such as carbon dioxide, the gas such as carbon dioxide can be released from the container 101 in an appropriate amount, which reduces the risk of the contents leaking out along with the contents and reduces the risk of the lid 10 unintentionally coming off the container 101 due to gas pressure.

[0067] In addition, the lid body 10 is not limited to the case where the top surface 11 is formed in a uniformly flat shape, but also includes the case where holes or notches corresponding to the hole portions 16 and the through portions 17 are formed in the top surface 11, and also includes the case where a tab member 19 or nonwoven fabric 20 is provided at a predetermined position on the top surface 11.

[0068] Therefore, when it comes to the blank material for the lid body (blank material 50), when the blank material 50 is said to be in sheet form, this includes cases where holes or notches corresponding to the hole portions 16 or the through portions 17 are formed in the blank material 50, and also cases where tab members 19 or nonwoven fabrics 20 etc. are provided at predetermined positions on the blank material 50.

[0069] (Another Example of Modification 8) When a drinking spout-forming structure 18 is provided on the top surface 11 as shown in Figures 13C and 13E, from the viewpoint of preventing contamination near the drinking spout (small opening 18A), it is preferable to provide a designated portion identification mark 70 on the lid 10, as shown in Figure 13F, so that the portions of the outer peripheral edge 11A of the top surface 11, the side wall 13, and the curved portion 12 that are designated as portions near the small opening 18A (designated portions) can be distinguished from the designated portions. In Figure 13F, the designated portion identification mark 70 is provided as a line of a predetermined color along the outer peripheral edge 11A of the top surface 11. The provision of the designated portion identification mark 70 allows the portion where the designated portion identification mark 70 is provided to be used as a marker when handling the lid 10 by touching it with one's hand.

[0070] (Modification 9) In the lid 10 according to the first embodiment, a fiber-containing sheet 80 may be disposed on the underside 11B of the top surface 11, as illustrated in the following first to third examples. This configuration is referred to as Modification 9 of the first embodiment. The fiber-containing sheet 80 disposed on the underside 11B of the top surface 11 may be referred to as the first fiber-containing sheet. In this specification, the underside 11B refers to the surface of the top surface 11 that faces the opening 102 (the so-called opposing surface) when the lid 10 is attached to a container 101 having an opening 102.

[0071] (First Example) When the lid 10 according to the ninth modified example of the first embodiment has air vent holes 16 (also shown in FIG. 13A ), it is preferable that a fiber-containing sheet 80 is disposed on the underside 11B of the top surface 11 so as to cover the holes 16, as shown in FIGS. 28A and 28B (First Example). This configuration is referred to as the first example of the ninth modified example. FIGS. 28A and 28B are a plan view and a cross-sectional view schematically showing one example of the lid 10 according to the first example of the ninth modified example of the first embodiment.

[0072] In a plan view of the fiber-containing sheet 80, the lid 10 is avoided from bonding to the top surface 11 in a region of the fiber-containing sheet 80 facing the hole 16 and a predetermined region therearound, leaving a non-bonded portion 82. In the example of FIGS. 28A and 28B , a bonded portion 81 is formed along the outer peripheral edge of the fiber-containing sheet 80, where the fiber-containing sheet 80 and the underside 11B of the top surface 11 are bonded. In a plan view of the fiber-containing sheet 80, a non-bonded portion 82 is formed inside the bonded portion 81 (toward the center CT). In the non-bonded portion 82, the top surface 11 and the fiber-containing sheet 80 may be in contact with each other, or a gap 83 may exist between the top surface 11 and the fiber-containing sheet 80. The blank 50 for forming the lid 10 according to the first example of the ninth modified example of the first embodiment is formed by partially bonding the sheet material 55 and the fiber-containing sheet 80 (the bonded portion forms the bonded portion 81). In the portion of the blank 50 corresponding to the non-jointed portion 82, the sheet material 55 and the fiber-containing sheet 80 are not joined.

[0073] 28A and 28B , the joint 81 is formed as a structural part in which the fiber-containing sheet 80 and the top surface portion 11 are directly joined, but it may also be formed as a part in which the fiber-containing sheet 80 and the top surface portion 11 are joined via a layer of adhesive or the like. Note that the method for joining the fiber-containing sheet 80 and the top surface portion 11 (the method for forming the joint) is not particularly limited, and a heat sealing method or an ultrasonic joining method may be used. In the examples of Figures 28A and 28B , the joint 81 is formed in a ring shape, but this is just one example, and the shape of the joint 81 is not limited to this.

[0074] (Fiber-Containing Sheet) As shown in FIGS. 39A to 39C , the fiber-containing sheet 80 is a sheet having a structure in which multiple fibers 91 are arranged. FIGS. 39A to 39C are enlarged plan views showing one embodiment of the fiber-containing sheet 80. Note that FIGS. 39A to 39C are partial plan views showing the arrangement of the fibers 91 in a partial region along the surface direction of the fiber-containing sheet 80. The fibers 91 contained in the fiber-containing sheet 80 include at least one type selected from the group consisting of long fibers and short fibers. In the fiber-containing sheet 80, the multiple fibers 91 may be oriented ( FIGS. 39B and 39C ), or their orientation may be restricted ( FIG. 39A ). When multiple fibers 91 are oriented, the orientation of the fibers 91 may be generally unidirectional, or may be generally multidirectional (e.g., bidirectional), as shown in FIG. 39B . Here, the case where the fibers 91 are oriented in a specific direction is not limited to the case where all of the fibers 91 are aligned in a specific direction as their longitudinal direction, but also includes the case where the longitudinal direction of some of the fibers 91 deviates from the specific direction. Furthermore, the fiber-containing sheet 80 may have a difference in fiber density (dense or coarse fiber density) in terms of the fiber density at different positions in the plane of the fiber-containing sheet 80. Furthermore, when the fiber-containing sheet 80 has a difference in fiber density (dense or coarse fiber density), the surface shape of the fiber-containing sheet 80 may be formed with irregularities such that high-fiber-density areas are convex and low-fiber-density areas are concave. Furthermore, the fiber-containing sheet 80 may have a plurality of hole-like portions 92 in the plane of the fiber-containing sheet 80 as portions where no fibers 91 are present. In the example of FIG. 39B , the hole-like portions 92 are formed in a roughly lattice pattern, with low-fiber-density areas present around the hole-like portions 92, and the high-fiber-density areas are formed in a mesh pattern sandwiched between the low-fiber-density areas. 39B, the fiber-containing sheet 80 has a raised structure that forms a convex shape from the low fiber density area toward the high fiber density area. When such unevenness or holes 92 are formed, if a liquid is contained in the container 101 in the state of the lidded container 150, even if the liquid moves forcefully toward the fiber-containing sheet 80, the liquid particles are broken down and the force can be efficiently reduced.

[0075] (Water-repellent and breathable) The fiber-containing sheet 80 preferably has water-repellent properties. The water-repellent properties of the fiber-containing sheet 80 can be achieved, for example, by using water-repellent fibers 91, as described below. The fiber-containing sheet 80 may also have breathability. The breathability of the fiber-containing sheet 80 can be achieved by adjusting the density of the fibers 91. When the fiber-containing sheet 80 is a composite sheet composed of fibers 91 and non-fibers, it is preferable that the fiber-containing sheet 80 is configured so that the breathability of the composite sheet is not completely blocked, regardless of the composition of the fibers 91 or non-fibers. In particular, as shown in Figures 39A and 39B, the breathability is not blocked in positions facing the holes 16 and through-holes 17 formed in the top surface 11 and in areas facing those positions and in the vicinity thereof.

[0076] (Fibers) Examples of the material of the fibers 91 contained in the fiber-containing sheet 80 include resins such as synthetic resins and natural resins, pulp, wood, bamboo, and metal. However, it is preferable that the fibers 91 contained in the fiber-containing sheet 80 have water-repellent properties. Therefore, when a water-absorbent material (e.g., pulp) is used as the material of the fibers 91 contained in the fiber-containing sheet 80, the fibers 91 are used that have been subjected to a water-repellent treatment. The water-repellent treatment of the fibers may be a treatment in which a resin is coated around the fibers, or a treatment in which a water-repellent material such as wax is attached to the surface and / or interior of the fibers.

[0077] The fiber-containing sheet 80 may be a fiber sheet made of fibers 91 (a fiber sheet) or a composite sheet made of fibers 91 and non-fibers (a composite sheet). An example of a composite sheet is a structure in which a layer made of a fiber sheet and a resin layer are laminated together. Examples of the fiber-containing sheet 80 include nonwoven fabric, paper, spunlace, and spunbond. Examples of mesh-like fiber sheets include sheets made of recycled fibers using wood pulp (e.g., Lyocell, Tencel (trademark), etc.), and spunlace. From the standpoints of water repellency, ease of handling, and the ability to prevent liquid from leaking out of the container 101, the fiber-containing sheet 80 is preferably a fiber sheet made of water-repellent fibers, and among fiber sheets, nonwoven fabric is preferred.

[0078] The explanation of the fiber-containing sheet and fibers described in the first example is also the same for the second and third examples described below, so detailed explanations of the fiber-containing sheet and fibers will be omitted in the second and third examples.

[0079] (Second Example) In the case where the lid 10 according to the ninth modified example of the first embodiment has a through hole 17 that forms a straw insertion port, as shown in FIGS. 29A and 29B , it is preferable that a fiber-containing sheet 80 be disposed on the underside 11B of the top surface 11 so as to cover the through hole 17 (second example). This configuration is referred to as the second example of the ninth modified example. FIGS. 29A and 29B are a plan view and a cross-sectional view, respectively, of an example of the lid 10 according to the second example of the ninth modified example of the first embodiment. In a plan view of the fiber-containing sheet 80, the lid 10 avoids bonding to the top surface 11 in a region of the fiber-containing sheet 80 that faces the through hole 17 and a predetermined region therearound, thereby forming a non-bonded portion 82. In the example of FIGS. 29A and 29B , a bonded portion 81 is formed outside the non-bonded portion 82 of the fiber-containing sheet 80, where the fiber-containing sheet is bonded to the underside 11B of the top surface 11. As explained in the first example of variant example 9, in the non-bonded portion 82, the top surface portion 11 and the fiber-containing sheet 80 may be in contact, or a gap 83 may exist between the top surface portion 11 and the fiber-containing sheet 80.

[0080] In the second example, it is preferable that the fiber-containing sheet 80 also has a through-hole 90 that forms a straw insertion port. In this case, the through-hole 17 formed in the top surface 11 is referred to as the first through-hole, and the through-hole 90 formed in the fiber-containing sheet 80 is referred to as the second through-hole. The first and second through-holes are arranged so as not to overlap each other, and when a long object such as a straw is inserted through the first through-hole (through-hole 17) of the lid 10, it can pass from the first through-hole to the second through-hole (through-hole 90). Specifically, in the example of FIG. 29A , the first and second through-holes are both formed in a roughly cross shape with the center CT as a non-through-hole, and are arranged so that when the first through-hole is rotated 45 degrees clockwise, it overlaps with the second through-hole. Note that the example of FIG. 29A is merely an example and does not limit the structures of the first and second through-holes in the second example.

[0081] (Third Example) In the lid 10 according to the ninth modified example of the first embodiment, when a drinking spout forming structure 18 that forms a drinking spout is further formed in addition to the first example, as shown in Figures 30A and 30B, it is preferable that a fiber-containing sheet 80 is disposed on the underside 11B of the top surface 11, avoiding the small lid portion 18B of the drinking spout forming structure 18 (third example). This configuration is referred to as the third example of the ninth modified example. Figures 30A and 30B are plan views schematically showing an example of the lid 10 according to the third example of the ninth modified example of the first embodiment. Note that Figures 30A and 30B show a case in which a tab member 19 is provided on the small lid portion 18B of the lid 10. Since the fiber-containing sheet 80 is positioned to avoid the small lid portion 18B, even if the small lid portion 18B is pulled up around the hinge portion 18C as an axis as shown by the dashed line in Figure 30B (in Figure 30B, the small lid portion 18B is pulled up as the tab member 19 is pulled up), it is unlikely that pieces of the fibers 91 of the fiber-containing sheet 80 will be located near the small opening 18A, and even if the user places their mouth over the small opening 18A, pieces of the fibers 91 are unlikely to come into contact with the user's mouth, thereby reducing the discomfort the user may experience from the fibers 91 touching the user's mouth.

[0082] (Modification 10) In the lid 10 according to the first embodiment, as shown in FIGS. 31A and 31B , a fiber-containing sheet 80 may be disposed so as to connect adjacent small wall portions 14 on the inner circumferential surface 13A of the side wall portion 13. This configuration is referred to as Modification 10 of the first embodiment. The fiber-containing sheet 80 connecting adjacent small wall portions 14 on the inner circumferential surface 13A of the side wall portion 13 may be referred to as a second fiber-containing sheet. FIGS. 31A and 31B are a side view and a cross-sectional view schematically illustrating a portion of an example of the lid 10 according to Modification 10 of the first embodiment. FIG. 31B is a cross-sectional view schematically illustrating the longitudinal section taken along line PP in FIG. 31A . The fiber-containing sheet 80 in Modification 10 is the same as that described in Modification 9 above, and therefore a detailed description thereof will be omitted.

[0083] 31A , the fiber-containing sheet 80 is arranged to connect two adjacent small wall portions 14 and overlap at least a portion of the overlapping portion 30. The fiber-containing sheet 80 is joined to both adjacent small wall portions 14. In addition, the fiber-containing sheet 80 is arranged such that a portion of each small wall portion 14 between the first side end 33A and the second side end 33B is exposed on the inner circumferential surface 13A of the side wall portion 13. In this case, overlapping portions and wrinkles of the fiber-containing sheet 80 are less likely to occur, and the risk of excessive unevenness of the fiber-containing sheet 80 on the inner circumferential surface 13A of the side wall portion 13 can be reduced.

[0084] (Example of Shape of Fiber-Containing Sheet) The shape of the fiber-containing sheet 80 is not particularly limited, but is preferably a gear-like shape when attached to the sheet material 55 that forms the sheet-shaped blank 50 (i.e., when the lid 10 is unfolded), as shown in FIGS. 32A and 32B . The example of the fiber-containing sheet 80 shown in FIG. 32A has an annular portion 84 and multiple extension pieces 85 that extend outward from the outer periphery of the annular portion 84 and are aligned along the outer periphery. The extension pieces 85 are formed in positions corresponding to the cutouts 54 when the fiber-containing sheet 80 is placed on the sheet material 55, as shown in FIG. 32B . FIG. 32A is a plan view showing an example of the fiber-containing sheet 80 when attached to the sheet material 55. FIG. 32B is a plan view (bottom view of the blank 50) showing the fiber-containing sheet 80 attached to the sheet material 55. Note that in this specification, the concept of a blank 50 also includes a structure in which a fiber-containing sheet is attached to a sheet material 55, as shown in FIG. 32B .

[0085] When the fiber-containing sheet 80 is formed in a gear shape, even if there are multiple adjacent small wall portions 14, the adjacent small wall portions 14 can be covered with a single member, as shown in Figure 33, and when the lid body 10 is molded, it is less likely that the fiber-containing sheets 80 will overlap.

[0086] 32B , a joint 86 is formed between the sheet material 55 and the fiber-containing sheet 80 inside the position that will become the boundary between the side wall 13 and the top surface 11 when the lid 10 is formed, and it is preferable that the sheet material 55 and the fiber-containing sheet 80 are not joined in a portion outside the joint 86 (toward the outer edge of the blank 50). That is, in the blank 50 for forming the lid 10 according to the tenth modification of the first embodiment, the sheet material 55 and the fiber-containing sheet 80 are partially joined, and the joining of the sheet material 55 and the fiber-containing sheet 80 is avoided in a portion corresponding to the outside of the joint 86. As a result, when the lid body 10 is formed from the blank 50, adjacent folding margins 51 formed in the sheet material 55 partially overlap each other to form the overlapping portion 30, and then the folding margins 51 and the fiber-containing sheet 80 can be joined together with the overlapping portion 30 formed, thereby forming a structure in which adjacent small wall portions 14 are connected by the fiber-containing sheet 80. Note that in the example of Figure 32B, the joining portion 86 is formed in an annular shape, but this is just one example, and the joining portion 86 is not limited to an annular shape.

[0087] (Manufacturing of lid body) A blank material 50 such as that shown in Figure 32B is bent according to the shape of the lid body 10, and the shape of the blank material 50 is then formed into the shape of the lid body 10.Then, the folding margin portion 51 and the fiber-containing sheet 80 (extension piece portion 85) are joined, thereby manufacturing a lid body 10 such as that shown in Figure 33.

[0088] (Functions and Effects) The lid 10 according to the modification 10 of the first embodiment can further stabilize the shape of the side wall 13. In the first embodiment, the small wall joints 15 formed at the overlapping portions (overlapping portions 30) of adjacent small wall portions 14 suppress damage to the overlapping portions 30 of the adjacent small wall portions 14, thereby stabilizing the shape of the side wall 13. Therefore, even if an outward force is applied to the small wall joints 15, the risk of damage to the shape of the side wall 13 can be reduced.

[0089] (Modification 11) In the lid 10 according to the first embodiment, the positional relationship between the two side end portions 33 that define the overlapping portion 30 may be such that, as shown in FIGS. 43A to 43C , the two side end portions 33 that define the overlapping portion 30 are twisted from the distal end 38 toward the proximal end 37 in a predetermined section extending from the vicinity of the proximal end 37 to the proximal end 37, forming a folded structure 39 at the proximal end 37 (Modification 11). FIG. 43A is a perspective view illustrating an example of the lid 10 according to Modification 11 of the first embodiment. FIG. 42A is also a perspective view illustrating the overlapping portions of the small wall portions 14. FIG. 42B is a plan view schematically illustrating the state when FIG. 42A is viewed from the inside outward. FIG. 42C is a cross-sectional view schematically illustrating the state of the longitudinal section taken along line A1-A1 in FIG. 42B.

[0090] 43A , the side end surface forming the first side end portion 33A is twisted from the distal end 38 toward the proximal end 37 so as to be directed toward the inner surface portion 34 of the first small wall portion 14A, and further forms a first folded portion 39A. The side end surface forming the second side end portion 33B is twisted from the distal end 38 toward the proximal end 37 so as to be directed toward the outer surface portion 35 of the second small wall portion 14B, and further forms a second folded portion 39B. The first folded portion 39A and the second folded portion 39B are connected at the proximal end 37 to form a folded structure portion 39. 43B and 43C, in the example of Fig. 43A, the first folded portion 39A and the second folded portion 39B are formed such that the inner surfaces 34 of the first small wall portion 14A face each other in the inward and outward direction, and the outer surfaces 35 of the second small wall portion 14B face each other in the inward and outward direction. In the examples shown in Figs. 42A to 43, the overlapping portion 30 includes the base ends 37 of the side end portions 33.

[0091] In the example shown in Figures 42A and 42B, the positional relationship of the two side ends 33 that define the overlapping portion 30 is such that the two side ends 33 that define the overlapping portion 30 are twisted from the distal end 38 toward the proximal end 37 in a predetermined section from the vicinity of the proximal end 37 to the proximal end 37. In Figure 42A, the side end surface that forms the first side end 33A twists from the distal end 38 toward the proximal end 37. In addition, the side end surface that forms the second side end 33B twists from the distal end 38 toward the proximal end 37. As shown in Figures 42B and 42C, in the example shown in Figure 42A, the state in which the inner surfaces 34 of the small wall portions 14 face each other and the outer surfaces 35 of the small wall portions 14 face each other are avoided at the proximal end 37. In the example shown in Figures 42A to 43, the overlapping portion 30 includes the proximal ends 37 of the side ends 33.

[0092] In the eleventh modification of the first embodiment, the overlapping portion 30 has a folded structure 39 formed at the base end 37, and the portion slightly above the base end 37 (the portion slightly above the small wall portion 14 (the portion closer to the top surface 11)) is also included in the overlapping portion 30. According to the eleventh modification of the first embodiment, the overlapping portion 30 is formed so that there are no gaps between adjacent small wall portions 14 from the lower end of the side wall portion 13 to the end closer to the top surface 11. In the example of FIGS. 43A to 43C , the folded structure 39 is formed in a Z-shape, but this is just one example, and the folded structure 39 may be formed in a shape that is continuously folded in a Z-shape (formed in a zigzag shape). Alternatively, the folded structure 39 may be partially formed in a zigzag shape and partially formed in a Z-shape.

[0093] According to the cover body 10 of the eleventh modification of the first embodiment, the overlapping portion 30 forms a folded structure portion 39 near the base end 37, so that the stiffness of the overlapping portion 30 near the base end 37 can be strengthened, and therefore, even if the width of the overlapping portion 30 becomes smaller near the base end 37, it becomes easy to stabilize the structure of the overlapping portion 30.

[0094] The lid 10 according to the eleventh modification of the first embodiment can be manufactured as shown in FIGS. 45A and 45B . That is, when bending the fold margins 51 of the blank 50 to form the minor wall portions 14, the lid 10 can be manufactured by bending at least some of the fold margins 51 around a bending axis BM (a position away from the slit 54) away from the base end 37 (the rear end 63 of the slit 54). FIGS. 45A and 45B are diagrams illustrating the bending positions of the fold margins 51 of the blank 50 to manufacture the lid 10 according to the eleventh modification of the first embodiment. For ease of explanation, FIGS. 45A and 45B illustrate only two fold margins 51 of a circular sheet 55, omitting other components. The same applies to FIG. 45C .

[0095] (Modification 12) In the lid 10 according to the first embodiment, the positional relationship between the two side ends 33 that define the overlapping portion 30 may be such that the two side ends 33 that define the overlapping portion 30 are gradually offset from each other in the inward / outward direction from the base end 37 toward the tip end 38 within a predetermined section extending from the vicinity of the base end 37 to the base end 37, as shown in Figures 44A to 44C (Modification 12). Figure 44A is a perspective view illustrating an example of the lid 10 according to Modification 12 of the first embodiment. Figure 44A is also a perspective view illustrating the overlapping portions of the small wall portions 14. Figure 44B is a plan view schematically illustrating the state when Figure 44A is viewed from the inward / outward direction. Figure 44C is a cross-sectional view schematically illustrating the state of the longitudinal section taken along line A3-A3 in Figure 44B.

[0096] In the twelfth modification of the first embodiment, it is preferable that the two side ends 33 are arranged so as to avoid twisting of the side ends 33. According to the twelfth modification of the first embodiment, the side ends 33 can be joined in a state where they face each other at the position of the base ends 37 of the side ends 33 (a state where the side end face of the first side end 33A faces the side end face of the second side end 33B), and flexibility at the position of the base ends 37 of the side ends 33 can be more easily ensured than when the overlapping portion 30 includes the base ends 37 of the side ends 33.

[0097] For example, FIG. 48A is an example of a lid 10 having the configuration described in Modification 12 of the first embodiment. FIG. 48A is a cross-sectional view showing an example of the lid 10 according to Modification 12 of the first embodiment. The lid 10 according to Modification 12 of the first embodiment makes it easier to maintain the thickness of the curved portion 12 and its vicinity relatively thin, thereby making it easier to maintain the flexibility of the portion that contacts the edge 103 of the container 101. This also applies to the second to seventh embodiments. For example, FIG. 48B is a cross-sectional view showing an example of the lid 10 according to the seventh embodiment described below, which has the configuration described in Modification 12 of the first embodiment. Even in this case, the lid 10 makes it easier to maintain the thickness of the curved portion 12 and its vicinity relatively thin, thereby making it easier to maintain the flexibility of the portion that contacts the edge 103 of the container 101.

[0098] As shown in Figure 45C, the lid 10 according to the 12th modification of the first embodiment can be manufactured by bending the folding margins 51 of the blank 50 to form the minor wall portions 14, by bending the folding margins 51 about a bending axis BM at a position that will become the base end 37 (the rear end 63 of the notch 54) or a predetermined position further towards the tip than the rear end 63 for at least some of the folding margins 51. Figure 45C is a diagram illustrating the bending positions of the folding margins 51 of the blank 50 for manufacturing the lid 10 according to the 12th modification of the first embodiment.

[0099] (Modification 13) In the lid 10 according to the first embodiment, an inwardly folded portion 68 extending circumferentially (laterally) of the side wall portion 13 may be formed in a predetermined portion on the upper end side of the overlapping portion 30, in a predetermined section from near the base ends 37 of the two side end portions 33 to the base ends 37 (Modification 13). FIG. 46A is a perspective view illustrating an example of the lid 10 according to Modification 13 of the first embodiment. FIG. 46A is also a perspective view illustrating the overlapping portions of the small wall portions 14. FIG. 46B is a plan view schematically illustrating the state when FIG. 46A is viewed with the inward and outward directions as the viewing direction. FIG. 46C is a cross-sectional view schematically illustrating the state of the longitudinal section taken along line A4-A4 of FIG. 46B.

[0100] In the thirteenth modification of the first embodiment, there are fewer portions of the side end 33 where twisting occurs, and the base end 37 can be positioned approximately at the end of the inwardly folded portion 68 as shown in Fig. 46B. Furthermore, as shown in Fig. 46C, the base end 37 contacts the small wall portion 14 (the second small wall portion 14B in Fig. 24C) on the inner circumferential surface 13A side of the side wall portion 13, so that gaps or steps are less likely to form on the inner circumferential surface 13A side near the base end 37, and the risk of the contents of the container 101 leaking to the outside from the base end 37 when the lid 10 is attached to the container 101 can be reduced. Furthermore, according to the twelfth modification of the first embodiment, flexibility of the side end 33 at the base end 37 can be easily ensured.

[0101] As shown in Figure 47, the lid body 10 according to the twelfth modification of the first embodiment can be realized by specifying a bending axis for one of the adjacent folding margins 51 when bending the folding margins 51 of the blank 50 to form the small wall portion 14. That is, if the clockwise time progression direction of the adjacent folding margins 51 is defined as the forward direction (the direction of arrow AR1), the bending axis of the folding margin 51 on the forward side is defined as bending axis BM1, and the bending axis of the folding margin 51 on the rear side is defined as bending axis BM2. For both bending axes BM1 and BM2, the bending axes BM1 and BM2 extend clockwise toward the forward side so as not to intersect with the notch 54, and extend clockwise toward the rear side (the direction of arrow AR2) so as to intersect with the notch 54 at or near the position that becomes the base end 37 (the rear end 63 of the notch 54). Specifically, the bending axis BM2 intersects the bending axis BM1 on the clockwise forward side (the side in the direction of arrow AR1) but does not intersect with the notch portion 54, and intersects with the rear end 63 of the notch portion 54 on the clockwise rear side (the side in the direction of arrow AR2).

[0102] By determining these bending axes BM1 and BM2 and bending the fold margin 51 along the bending axes BM1 and BM2 in this order, the inner fold 68 is formed and the small wall 14 is formed, thereby manufacturing the lid 10. Figure 47 is a diagram illustrating the bending position of the fold margin 51 of the blank 50 for manufacturing the lid 10 according to the thirteenth modification of the first embodiment.

[0103] 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 that protrudes inward (toward the center CT) is formed at a predetermined position on the side wall portion 13. FIGS. 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 of the lid 10 according to the second embodiment are the same as those of the first embodiment, and therefore a description of the configuration common to the first embodiment will be omitted.

[0104] 11A to 11C , in the lid 10, a protrusion 25 that protrudes inward (toward the center CT, in the direction from the outer peripheral surface 13B of the side wall 13 toward the inner peripheral surface 13A) is formed at a predetermined position on the side wall 13. The protrusion 25 is preferably a protruding stripe that is formed around the inner peripheral surface 13A of the side wall 13.

[0105] 11A to 11C , in the lid 10 according to the second embodiment, a convex structure of convex portions 25 may be formed on the inner peripheral surface of the side wall portion 13, and concave portions 24 may be formed at positions corresponding to the positions where the convex structures are formed on the outer peripheral surface 13B of the side wall portion 13. By forming such a structure, the shape of the side wall portion 13 can be further stabilized.

[0106] 11A to 11C illustrate 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. Alternatively, 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, as shown in FIG. 18C. FIGS. 17C and 18C are cross-sectional views for explaining another example of the lid body 10 according to the second embodiment.

[0107] 8A to 8C, the lid 10 according to the third embodiment has the same configuration as that of the first embodiment, except that the bending portion 12 is configured as a protruding portion 26. FIGS. 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, side wall portion, and 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.

[0108] (Protrusion) As shown in FIGS. 8A to 8C , the cover 10 has a structure (protrusion structure) in which a predetermined region SR1 protrudes upward from the center CT toward the outer peripheral edge 11A of the top surface 11. In the examples of FIGS. 8A to 8C , the portion protruding upward from the region SR1 is the protrusion 26. In the examples of FIGS. 8A to 8C , the bending portion 12 is defined as being formed by the protrusion 26. The center of the bending portion 12 is defined as a position between a position U1 where the bending portion 12 begins to bend outward from the center CT and a position U2 at the outer end of the protrusion 26, and this position is defined as the boundary DE between the top surface 11 and the side wall 13. In the examples of FIGS. 8A to 8C , the boundary DE is defined as approximately the upper end of the protrusion 26. In this case, the area inward from the upper end of the protrusion 26 is the top surface 11, and the area outward from the upper end of the protrusion 26 is the side wall 13.

[0109] The size of the protruding portion 26 is set to a size that can cover the edge portion 103 of the container 101 and form a recess 27 , which will be described later.

[0110] (Recessed Portion) In the third embodiment, the inner surface 26A 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 achieved depending on the shape of the mold used when forming the lid 10 from the blank 50.

[0111] (Size of recessed portion) 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 will be described later with reference to Figure 20, the edge portion 103 will generally fit into the recessed portion 27, and the outer end portion of the edge portion 103 (in the example of Figure 20, the outer peripheral surface portion 111 of the edge portion 103) can be in 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.

[0112] (Small wall portion) The position of the base end portion 31 of the small wall portion 14 may be at position U2 of the outer end of the protruding portion 26, or slightly below position U2, or may be above position U2 and below position DE.

[0113] 8A to 8C illustrate 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 . Furthermore, 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.

[0114] [3-3 Actions and Effects] The lid according to the third embodiment can achieve the same effects as the first embodiment. Furthermore, the lid according to the third embodiment has a protruding portion 26 and a recessed portion 27 formed at the bent portion 12, and the recessed portion 27 is large enough to receive the edge portion 103 of the container 101 and to make surface contact with the outer end portion of the edge portion 103. This can further increase the flexibility of the side wall portion 13 near the bent portion 12 (the portion where the protruding portion 26 is formed), and can further increase the difference in flexibility between the side wall portion 13 near the bent portion 12 and the portion far from the bent portion 12. This allows for stronger contact between the lid 10 and the edge portion 103 of the container 101, particularly the outer peripheral surface, and can create a state in which the side wall portion 13 of the lid 10 is more firmly engaged with the edge portion 103 of the container 101.

[0115] 26A and 26B, the attachment of the lid 10 to the container 101 will be further described. Fig. 26A is a cross-sectional view illustrating an embodiment in which the side wall 13 of the lid 10 is hooked onto the edge 103 of the opening 102 of the container 101. Fig. 26B is a cross-sectional view illustrating an embodiment in which the opening 102 of the container 101 is closed by the lid 10.

[0116] When attaching the lid 10 to the container 101, the recessed portion 27 of the lid 10 is latched (fitted) onto one end of the edge 103 of the container 101, and as shown in FIG. 26A , the lid 10 is bent obliquely upward so as to lift the side wall 13 at the end (the boundary between the top surface 11 and the side wall 13) formed at a position ST2 farthest from the latched end (the boundary between the top surface 11 and the side wall 13) of the lid 10. FIG. 26A shows the bent state of the lid 10. While the lid 10 is being bent, the end portion of the lid 10 is pulled in the direction of arrow F1 until the inner circumferential surface of the side wall 13 of the lid 10 is positioned near directly above the edge 103 of the container 101 (preferably slightly outward from directly above the edge 103). (At this time, the edge 103 of the container 101 may be deformed slightly inward.) Then, the side wall 13 is pushed down in the direction of 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) onto the recessed portion 27 of the lid 10.

[0117] 26B , when the lid 10 is fitted onto the edge 103 of the container 101, the edge 103 of the container 101 can apply a stress T outward to the lid 10. The lid 10 is subjected to the stress T from the container 101, but the shape-retaining force of the overlapping portion 30 of the side wall 13 of the lid 10 makes it easier for the lower end of the side wall 13 to wrap around under the edge 103 as shown by arrows F2 and F3. This makes it easier for the side wall 13, the top surface 11, and the bent portion 12 to embrace the edge 103 of the container 101, thereby enabling the lid 10 and the container 101 to be more tightly attached to each other. When the lid 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 111 of the rim 103. However, a gap 114 is formed between the recessed portion 27 and the rim 103 from the upper end 112 of the rim 103 inward (the inner peripheral surface 113). Furthermore, in the third embodiment, when the protruding portion 26 is extended, its recovery force further improves the adhesion between the lid 10 and the outer peripheral surface of the rim 103 of the container 101. Furthermore, in the top surface 11, a force is likely to be applied in the inward direction as shown by arrows F1A and F1B, which also makes the gap 114 more likely to form. However, the shape-retaining force of the overlapping portion 30 of the side wall 13 of the lid 10 enhances the effect of suppressing the risk of the lid 10 detaching from the container 101 and also improves the adhesion between the lid 10 and the outer peripheral surface of the rim 103 of the container 101. 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, in which the area surrounded by the dashed line in accordance with the cross-sectional view of the lid 10 is enlarged, 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.

[0118] In addition, from the viewpoint of easily ensuring a state similar to that when the lid body 10 described here is attached to the container 101, it is preferable that the top surface portion 11 is positioned at the same position as or below the upper end of the protrusion portion 26, as shown in Figure 26B, etc.

[0119] [3-2 Modifications of the Lid] (Modification 1) In the lid 10 according to the third embodiment, the protruding direction (protruding direction) of the protruding portion 26 is a direction extending upward (+Z direction) from the top surface 11 in FIG. 8A . However, as shown in FIGS. 14A to 14C , the protruding direction may extend outward (away from the center CT) from a predetermined region SR2 on the upper end of the sidewall 13 (Modification 1). FIGS. 14A to 14C are diagrams illustrating a lid according to Modification 1 of the third embodiment. In the examples of FIGS. 14A to 14C , the portion protruding laterally from the region SR2 is the protruding portion 26. In the examples of FIGS. 14A to 14C , the bent portion 12 is defined as being formed by the protruding portion 26, as described above. The center of the bending portion 12 is determined to be between position U1 where the bending portion 12 begins to bend downward and position U2 of the lower end of the overhanging portion 26, and this position is determined as the boundary DE between the top surface portion 11 and the side wall portion 13. In the example of Figures 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. In this case, too, the inner surface 26A side of the overhanging portion 26 is a sunken portion (sunken portion 27).

[0120] (Variation 2) In FIG. 8A , the protruding portion 26 is a portion forming a structure protruding upward from the top surface portion 11. However, as shown in FIGS. 15A and 15B , the protruding portion 26 may be a portion forming a structure in which a predetermined region SR1 near the outer peripheral edge 11A of the top surface portion 11 protrudes upward and a predetermined region SR2 near the upper end of the side wall portion 13 protrudes outward from the center CT (an outwardly bulging structure) (Variation 2). FIGS. 15A and 15B are diagrams illustrating a lid according to Variation 2 of the third embodiment. In the example of FIGS. 15A and 15B , the portion in which the region SR1 protrudes upward and the region SR2 protrudes outward (a portion forming an outwardly bulging structure) constitutes the protruding portion 26. In the example of FIGS. 15A and 15B , the bent portion 12 is defined as a protruding portion, as described above. The center of the bending portion 12 is determined to be an intermediate position along the overhanging portion 26 between position U1 where the bending begins in the upward direction near the center CT in region SR1, and 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 11 and the side wall 13. In this case, the portion of the overhanging portion 26 extending from position DE designated for the overhanging portion 26 toward the center CT constitutes the top surface 11, and the portion below position DE designated for the overhanging portion 26 constitutes the side wall 13. Even in this case, the inner surface 26A side of the overhanging portion 26 is a sunken portion (sunken portion 27).

[0121] (Variation 3) In the lid body 10 according to the third embodiment, a drinking spout forming structure 18 may be provided on the top surface 11 as shown in FIG. 24 (Variation 3). FIG. 24 is a plan view illustrating one example of Variation 3 of the third embodiment. In the example of FIG. 24, as described in Variation 8 of the first embodiment using FIG. 13, the drinking spout forming structure 18 is formed by 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 serves as 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 inward from the inner end of the protruding portion 26. In this case, the protrusion 26 can prevent 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 edge 11A of the top surface 11 is a gently sloping surface, any contents that attempt to spill outward from the top 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 top surface (exposed surface) of the lid body 10 and its surrounding areas becoming soiled by spilled contents.

[0122] 21A to 21C , the lid 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 a protruding portion 26, and a convex portion 25 is formed at or near the end (outer end) of the end of the protruding portion 26 that is closer to the side wall portion. FIGS. 21A to 21C are diagrams for explaining one example of the lid 10 according to the fourth embodiment. Except for the configuration of the protruding portion 26, the configurations of the top surface, side wall, and small wall portions of the lid 10 according to the third embodiment are the same as those of the first embodiment, and therefore a description of the configuration common to the first embodiment will be omitted.

[0123] (Convex Portion) As described above, 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 protruding portion 26 that is closer to the side wall portion 13, as shown in FIGS. 21A to 21C . FIGS. 21A to 21C show an example in which the convex portion 25 is formed on the side wall portion 13 of the lid 10 according to Modification 2 of the third embodiment so as to be continuous with the end 28A (outer end) of the protruding portion 26. Note that in FIGS. 21A to 21C , the reference numeral 28B indicates the end 28 of the protruding portion 26 that is closer to the top surface 11. As shown in FIG. 21A , the convex portion 25 is formed in a continuous ring shape along the outer peripheral surface of the lid 10, but this does not prohibit the presence of a partially unformed portion. However, from the viewpoint of achieving closer surface contact between the lid 10 and the container 101, it is preferable that the convex portion 25 be formed in a continuous ring shape on the outer peripheral surface of the side wall portion 13.

[0124] The degree (size) of inward protrusion of the protrusion 25 is preferably 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.

[0125] 21A to 21C , the shape of the side wall portion 13 below the convex portion 25 (the −Z direction side in FIGS. 21B and 21C ) is formed in a shape (tapered shape) in which the cross-sectional diameter (cross-sectional diameter of the transverse cross section) decreases downward. This is one example, and the shape of the side wall portion 13 below the convex portion 25 may be a shape in which the cross-sectional diameter (cross-sectional diameter of the transverse cross section) is constant downward (a hanging shape, a non-tapered shape), or a shape in which the cross-sectional diameter (cross-sectional diameter of the transverse cross section) increases downward (a tapered shape). However, from the viewpoint of bringing the lid 10 into closer surface contact with the container 101, it is preferable that the shape of the side wall portion 13 below the convex portion 25 be tapered. Furthermore, if the shape of the side wall portion 13 below the convex portion 25 is tapered, the portion of the side wall portion 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 variant example 7 of the first embodiment.

[0126] The attachment of the lid 10 to the container 101 will be further described using FIG. 27 . FIG. 27 is a cross-sectional view illustrating an example of a state in which the lid 10 closes the opening 102 of the container 101. 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 using FIGS. 26A and 26B . However, in the fourth embodiment, as shown in FIG. 27 , the inner surface of the protrusion 25 faces and is in surface contact with the lower surface of the edge 103. Furthermore, 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. Furthermore, due to the shape stability of the overlapping portion 30 of the side wall portion 13, a stable surface contact can be formed between the inner surface (recessed portion 27) of the protruding portion 26 and the convex portion 25 so as to encase the outer peripheral surface portion 111 of the edge portion 103.

[0127] 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 curved 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.

[0128] (Unevenness) In the lid 10 according to the fifth embodiment, the unevenness 71 is formed by 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 contents leaking from inside the container 101 through the opposing portion between the lid 10 and the edge 103 of the container 101 when the lid 10 is used as a lidded container 150, it is preferable that the convex portions 72 and the concave portions 73 are each formed in a strip shape (line shape) that forms a ring that continues in the circumferential direction of the recessed portion 27, as shown in Figures 23A and 23B, so that the unevenness is a strip-like unevenness. In this case, when the recessed portion 27 is viewed in vertical cross section, the uneven portion is formed in a wave shape, which makes it easier to contact the edge portion 103 of the container 101 at multiple points, and more effectively suppresses 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. However, this does not prohibit the uneven portion from being a strip-like uneven portion. Although the uneven portion 71 is configured as an embossed uneven portion in Figures 23A and 23B, the shaped structure of the uneven portion is not limited to this.

[0129] In the lid body 10 of 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 part of the convex portion 25 that faces the edge portion 103 when the lid body 10 is attached to the container 101.

[0130] 6. Sixth Embodiment 6-1 Configuration of Lid The lid 10 according to the sixth embodiment has the same configuration as any of the third to fifth embodiments, except that the top surface 11 has an upwardly curved shape (a curved portion 74 is formed on the top surface 11), as shown in Fig. 22. The example in Fig. 22 shows an example of the fourth embodiment in which the top surface 11 has an upwardly curved shape.

[0131] As explained in the third embodiment, also in the sixth embodiment, when attaching the lid body 10 to the container 101, the recessed portion 27 of the lid body 10 is hooked (fitted) onto one end of the edge 103 of the container 101, and the lid body 10 is bent so as to warp diagonally upward so as to lift the side wall portion 13 of the lid body 10 at the end side away 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 onto the edge 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 even if the lid body 10 is pulled outward while being bent so as to warp diagonally upward, and the top surface portion 11 is stretched and expanded, the top surface portion 11 can follow the stretch and change shape. In addition, from the viewpoint of easily ensuring a state in which the lid body 10 described in the third embodiment is attached to the container 101 in the sixth embodiment as well, it is preferable that the upper end of the curved portion 74 is positioned at the same position as or below the upper end of the protrusion portion 26, as shown in Figure 22.

[0132] 7. Seventh Embodiment 7-1 Configuration of Lid As shown in FIGS. 34A and 34B , the lid 10 according to the seventh embodiment has the same configuration as any of the third to sixth embodiments, except that a fiber-containing sheet 80 is disposed on the inner surface 26A of the protruding portion 26. The fiber-containing sheet 80 disposed on the inner surface 26A of the protruding portion 26 may be referred to as a third fiber-containing sheet. The examples in FIGS. 34A and 34B show an example of the fourth embodiment in which the fiber-containing sheet 80 is disposed on the inner surface 26A of the protruding portion 26. In the lid 10 according to the seventh embodiment, the fiber-containing sheet 80 is the same as the fiber-containing sheet described in Variation 9 of the first embodiment, and therefore detailed description of the material and other aspects of the fiber-containing sheet 80 used in the lid 10 according to the seventh embodiment will be omitted.

[0133] 34A , the fiber-containing sheet 80 is disposed from the outer peripheral edge of the lower surface 11B of the top surface 11 or from near the outer peripheral edge of the lower surface 11B of the top surface 11 outward to a predetermined position along the inner surface 26A of the protruding portion 26. Furthermore, the fiber-containing sheet 80 may be disposed up to or near the protruding end of the convex portion 25 as shown in FIG. 34A . In the cover 10 according to the seventh embodiment, a sunken portion (sunken portion 27) is formed on the inner surface side of the fiber-containing sheet 80.

[0134] In the lid 10 according to the seventh embodiment, the fiber-containing sheet 80 is disposed on the inner surface 26A of the protruding portion 26, and when the lid 10 is attached to the container 101 (the state of the lid-equipped container 150), the edge portion 103 (e.g., the curled portion 108) of the container 101 is fitted into the recessed portion 27 formed on the inner surface side of the fiber-containing sheet, as shown in Fig. 41 . However, the fiber-containing sheet 80 contacts the outer peripheral surface 111 to the upper end 112 of the edge portion 103 (the curled portion 108 in Fig. 41 ), and the fiber-containing sheet 80 is generally spaced apart from the inner peripheral surface 113 of the edge portion 103. In this case, it is preferable that the distance between the inner peripheral surface 113 and the fiber-containing sheet 80 increases with increasing distance from the upper end 112.

[0135] Furthermore, in the lid body 10 of the seventh embodiment, even if unevenness occurs on the inner surface 26A of the protrusion portion 26 or the outer peripheral surface 111 of the edge portion 103, the fiber-containing sheet can function as a gasket between the outer peripheral surface 111 of the edge portion 103 and the inner surface 26A of the protrusion portion 26, absorbing the unevenness of the inner surface 26A and the outer peripheral surface 111, and the lid body 10 can be firmly fitted to the edge portion 103 of the container 101.

[0136] According to the seventh embodiment, as described above, the edge 103 of the container 101 abuts against the fiber-containing sheet 80. When a liquid is contained inside the container 101, the liquid may attempt to overcome the edge 103 and leak out due to circumstances such as vibration of the container 101. In the seventh embodiment, when the fiber-containing sheet 80 has a fiber density that varies as shown in Fig. 39B, even when liquid particles (droplets) attempt to overcome the edge 103, some of the droplets can enter the portions with a low fiber density, thereby breaking up the droplets and efficiently weakening the force of the droplets attempting to leak out.

[0137] [7-2 Modified Examples of Lid] (Modified Example 1) In the lid 10 according to the seventh embodiment, as shown in FIGS. 35A, 35B, and 35C, the fiber-containing sheet may be disposed not only on the inner surface 26A of the protruding portion 26 but also extend to the underside 11B of the top surface 11. This configuration is referred to as Modified Example 1 of the seventh embodiment. FIG. 35A is a plan view schematically illustrating an example of the lid 10 according to Modified Example 1 of the seventh embodiment. FIG. 35B is a cross-sectional view schematically illustrating the longitudinal section taken along line R-R in FIG. 35B. FIG. 35C is a partially enlarged view schematically illustrating an enlarged portion of the region EI surrounded by the dashed line in FIG. 35B. Note that FIG. 35A illustrates a case in which an air vent hole 16 is formed in the top surface 11.

[0138] The lid 10 according to the first modification of the seventh embodiment corresponds to a lid 10 further including the configuration of the lid 10 according to the ninth modification of the first embodiment. However, in the lid 10 according to the first modification of the seventh embodiment, the fiber-containing sheet 80 covers the inner surface 26A of the protruding portion 26 and the underside 11B of the top surface 11 as a single component. That is, the fiber-containing sheet 80 has a structure in which the third fiber-containing sheet and the first fiber-containing sheet are integrated. The portion of the fiber-containing sheet 80 facing the underside 11B of the top surface 11 is the same as that described in the ninth modification of the first embodiment. For example, as shown in FIG. 35C , the portion of the fiber-containing sheet 80 facing the underside 11B of the top surface 11, facing the air vent hole 16 and its surroundings, is not bonded to the top surface 11 (a non-bonded portion is formed). Furthermore, as shown in FIG. 35C , it is preferable that a gap 83 be formed between the fiber-containing sheet 80 and the top surface 11 in the non-bonded portion 82. In other respects, the portion of the fiber-containing sheet 80 facing the lower surface 11B of the top surface portion 11 is the same as that described in variant example 9 of the first embodiment, so detailed explanation will be omitted as long as the seventh embodiment can be realized.

[0139] (Variation 2) In the lid 10 according to the seventh embodiment, as shown in FIGS. 36A, 36B, and 36C, the fiber-containing sheet 80 may not only be disposed on the inner surface 26A of the protruding portion 26, but may also extend to connect adjacent small wall portions 14 on the inner circumferential surface 13A of the side wall portion 13. This configuration is referred to as Variation 2 of the seventh embodiment. FIG. 36A is a plan view schematically showing an example of the lid 10 according to Variation 2 of the seventh embodiment. FIG. 36B is a cross-sectional view schematically showing the state of the longitudinal section taken along line S-S in FIG. 36B. FIG. 36C is a side view schematically showing an example of the lid 10 according to Variation 2 of the seventh embodiment.

[0140] The lid 10 according to the second modification of the seventh embodiment corresponds to a lid 10 according to the tenth modification of the first embodiment, further including the configuration of the lid 10 according to the tenth modification of the first embodiment. However, in the lid 10 according to the first modification of the seventh embodiment, the fiber-containing sheet 80 covers the inner surface 26A of the protruding portion 26 as a single component and connects adjacent small wall portions 14. That is, the fiber-containing sheet 80 has a structure in which the third fiber-containing sheet and the second fiber-containing sheet are integrated. The portion of the fiber-containing sheet 80 connecting adjacent small wall portions 14 is the same as that described in the tenth modification of the first embodiment. For example, the fiber-containing sheet 80 preferably has a gear-like shape when attached to the sheet material 55 forming the sheet-shaped blank 50 (i.e., when the lid 10 is unfolded). Specifically, the fiber-containing sheet 80 has an annular portion 84 and a plurality of extending pieces 85 extending outward from the outer periphery of the annular portion 84 and aligned along the outer periphery. The extending piece portions 85 are formed at positions corresponding to the cut portions 54 when the fiber-containing sheet 80 is placed on the sheet material 55. In such a fiber-containing sheet 80, as shown in FIG. 36C , the portion that is to be placed on the inner surface 26A of the protruding portion 26 can be formed by the annular portion 84, and the portions connecting adjacent small wall portions 14 can be formed by individual extending piece portions 85. However, this does not prohibit a portion of the annular portion 84 from also serving as a portion connecting adjacent small wall portions 14, nor does it prohibit a portion of the extending piece portions 85 from also serving as a portion that is to be placed on the inner surface 26A of the protruding portion 26. In other respects, the portions of the fiber-containing sheet that connect adjacent small wall portions 14 are the same as those described in Modification 10 of the first embodiment as long as the seventh embodiment can be realized, and therefore detailed description thereof will be omitted.

[0141] (Variation 3) In the lid 10 according to the seventh embodiment, as shown in FIGS. 37A and 37B , the fiber-containing sheet may be disposed not only on the inner surface 26A of the protruding portion 26 but also extend to the underside 11B of the top surface 11, and the small wall portion 14 may be connected to the inner circumferential surface 13A of the side wall portion 13. This configuration is referred to as Variation 3 of the seventh embodiment. FIG. 37A is a plan view schematically illustrating an example of the lid 10 according to Variation 3 of the seventh embodiment. FIG. 37B is a cross-sectional view schematically illustrating the state of the vertical cross section taken along line T-T in FIG. 37B. Note that FIGS. 37A and 37B illustrate a case in which an air vent hole 16 is formed in the top surface 11.

[0142] The lid body 10 according to variant 3 of the seventh embodiment corresponds to a lid body 10 further including the configurations of variants 9 and 10 of the first embodiment, and corresponds to a combination of variant 1 of the seventh embodiment and variant 2 of the seventh embodiment.

[0143] The fiber-containing sheet 80 may have a structure in which the third fiber-containing sheet, the first fiber-containing sheet, and the second fiber-containing sheet are integrated. For example, as described in the second variation of the seventh embodiment, the fiber-containing sheet 80 preferably has a gear-like shape when attached to the sheet material 55 forming the sheet-shaped blank 50 (i.e., when the lid 10 is unfolded). However, unlike the second variation of the seventh embodiment, the third variation of the seventh embodiment differs from the second variation of the seventh embodiment in that the fiber-containing sheet 80 has a circular portion 87 and multiple extension pieces 85 extending outward from the outer periphery of the circular portion 87 and aligned along the outer periphery, as shown in FIGS. 38A and 38B . The multiple extension pieces 85 are connected to each other via the circular portion 87. The circular portion 87 has an inner portion 89 that faces the underside 11B of the top surface 11 when the lid body 10 is formed, and an outer portion 88 that faces the inner surface 26A of the protrusion portion 26 when the lid body 10 is formed, and the outer portion 88 corresponds to the annular portion 84 shown in variant example 2 of the seventh embodiment.

[0144] In the blank 50, the fiber-containing sheet 80 is annularly joined to the sheet material 55 in a partial region of the circular portion 87, as shown in FIG. 38B . In the example of FIG. 38B , the fiber-containing sheet 80 is annularly joined to the sheet material 55 in a region defined by the inner edge of the outer portion 88 and a predetermined position inside the inner portion 89, and this annular portion forms a joint 86. In the blank 50, the fiber-containing sheet 80 avoids joining at least a plurality of extension pieces 85 to the sheet material 55. In the blank 50 for forming the lid 10 according to Modification 3 of the seventh embodiment, the sheet material 55 and the fiber-containing sheet 80 are partially joined, and the sheet material 55 and the fiber-containing sheet 80 are not joined in a portion corresponding to the outside of the joint 86. The "portion corresponding to the outside of the joint" referred to here may include at least a portion of the "portion of the blank 50 that will form the protruding portion 26 when the lid 10 is formed." In the example of FIG. 38B, the joint 86 is formed in a ring shape, but this is just an example, and the shape of the joint 86 is not limited to a ring shape.

[0145] When forming the lid 10 from the blank 50, the blank 50 is bent in the direction of arrow FD in Figure 38, and adjacent folding margins 51 partially overlap each other to form the overlapping portion 30. At this time, the fiber-containing sheet 80 is bent with the multiple extension pieces 85 bent toward the inner portion 89, as shown in Figure 38B. Thereafter, with the folding margins 51 and the fiber-containing sheet 80 in the state where the overlapping portion 30 is formed, the fiber-containing sheet 80 is joined. At this time, a structure is also formed in which the fiber-containing sheet 80 connects adjacent small wall portions 14.

[0146] According to the lid body 10 of the seventh embodiment, a structure combining the seventh embodiment, the seventh embodiment, the seventh embodiment, the first modification, and the seventh embodiment, the second modification, can be realized using the fiber-containing sheet 80 as a single component, thereby suppressing an increase in the number of parts.

[0147] In the seventh embodiment, in the example shown in Figures 34A and 34B, the side wall portion 13 extends further downward from the lower end of the protrusion 25 and is tapered (reduced in diameter) from the lower end of the protrusion 25 to the lower end 13C. However, this is merely an example. The side wall portion 13 may be tapered (expanded in diameter) from the lower end of the protrusion 25 to the lower end 13C, or may be formed so that the length from the lower end of the protrusion 25 to the lower end 13C is generally constant (straight). This also applies to Modifications 1 to 3 of the seventh embodiment, as shown in Figures 40A and 40B. Figure 40A shows a cross-sectional view of an example of Modification 3 of the seventh embodiment, in which the length from the lower end of the protrusion 25 to the lower end 13C is generally constant (straight). FIG. 40B shows a cross-sectional view of an example of the third modification of the seventh embodiment in which the portion from the lower end of the convex portion 25 to the lower end 13C is formed to be tapered (expanded in diameter).

[0148] (Variation 4) In the lid 10 according to the seventh embodiment, as shown in Fig. 48C, the outer end of the fiber-containing sheet 80 may be located above the base end 37 of the side end 33 of the small wall portion 14. Fig. 48C is a cross-sectional view for explaining one example of the lid 10 according to Variation 4 of the seventh embodiment. Fig. 48C illustrates one example of Variation 4 of the seventh embodiment, taking as an example a case where the configuration described in Variation 12 of the first embodiment using Figs. 44A to 44C is applied to the seventh embodiment.

[0149] [8. Application Examples] (Application Example 1) The lid 10 described above can be used in a lidded container 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 its upper end. This example shows an example in which the lid 10 is engaged with the edge 103. Figure 19B is a cross-sectional view schematically showing the state of the vertical cross section taken along line CC in Figure 19A. The explanation of the lidded container 150 will continue with reference to Figures 3A and 3B.

[0150] (Container with lid) The container with lid 150 has a contact portion 151 where the container 101 and the lid 10 come into contact, and the region of the lid 10 that forms the contact portion 151 is the contact region R. The method for joining the lid 10 and the container 101 is not particularly limited, and any joining method such as crimping or heat fusion (heat sealing) can be used as appropriate. The following describes an example in which the lid 10 according to the first embodiment is used in the container with lid 150.

[0151] The container 101 has a container body 110 having a cylindrical sidewall 104 and a bottom 107 that increase in diameter upward (or taper downward), 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 sidewall 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 is not intended to 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 container as long as the opening 102 can be covered with the lid 10. In such a case, however, it is preferable that the shape of the lid 10 be a shape that matches the shape of the container 101 (e.g., a rectangular shape).

[0152] 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 a member forming the container body 110, or may be formed as a portion (a flange portion) that extends outward on a plane.

[0153] The object to be stored inside container 101 (space 105) is not particularly limited, and examples include liquids, solids, and combinations thereof, but the lid of the present invention is particularly effective when the contents are fluids such as liquids. That is, when the contents are fluids such as liquids, if the adhesion between the container and the lid is impaired due to an error in the dimensions of the container, the fluid will leak out from the container, so it is particularly important that the lid of the present invention can be securely attached to the container even if an error in the dimensions of the container occurs.

[0154] In the lidded container 150, 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 sidewall. In the example shown in FIGS. 19A and 19B , the contact area R is formed on both the top surface and the sidewall. The contact area R on the top surface is more easily maintained by also forming the contact area R on the sidewall (the presence of the contact area R on the sidewall can generate friction between the sidewall and the container, making it less likely for the top surface and the container to separate). Furthermore, the formation of the contact area R on the top surface prevents the contents contained in the space 105 of the container 101 from leaking out.

[0155] (Application Example 2) When the lid 10 has a protruding portion, as in the lids 10 of the third to seventh embodiments, the lid-equipped container 150 may have the edge 103 of the container disposed in the recess 27 formed on the inner surface 26A of the protruding portion 26, as shown in Fig. 20. Fig. 20 is a cross-sectional view illustrating the state in which the lid 10 of the third embodiment is fitted to the container 101. In this case, the contact area between the edge 103 and the lid 10 can be increased, making it difficult for the adhesion between the lid 10 and the container 101 to be impaired, and preventing the problem of fluid leaking from the container 101.

[0156] Application Example 3 The lid 10 according to the present invention may be combined with a container 101 having an opening 102 .

[0157] As explained above, the present invention can be applied to many such aspects. It can also be applied to stores and methods of providing packaging components other than those described above. The lid body according to the present invention has been described in detail above, but the above examples are merely examples of the lid body according to the present invention and are not limited to these. Therefore, modifications may be made as appropriate within the scope of the spirit of the present invention. Furthermore, the configurations of the inventions described above may be used independently of each other, or may be applied in appropriate combination.

[0158] Based on the above description of this specification, the present invention may adopt the following configurations [E1] to [E20]: [E1] A lid configured to be attachable to a container having an opening and an edge that forms the opening, and having a top surface that covers the opening when attached to the container, and a side wall that is formed in an annular shape along the outer periphery of the top surface, a bent portion at the outer periphery 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 forming a boundary between the top surface and the side wall portion, the side wall portion having a structure formed by the plurality of small wall portions, and having an overlapping portion where adjacent small wall portions partially overlap, and a small wall joint portion that joins adjacent small wall portions is formed in the overlapping portion. [E2] The lid described in [E1] above, wherein the small wall portion has an inner surface facing the container when attached to the container and an outer surface opposite the inner surface, and when adjacent small wall portions are defined as a first small wall portion and a second small wall portion, the small wall joint portion has a structure in which the outer surface of the first small wall portion is joined to the inner surface of the second small wall portion. [E3] The lid described in [E1] or [E2] 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 larger at the front edge than at the base end. [E4] The lid described in any of [E1] to [E3] above, wherein the side wall portion is tapered from the bent portion toward the lower end of the side wall portion. [E5] The lid according to any one of [E1] to [E4] above, wherein the side wall portion is tapered from the bent portion toward the lower end of the side wall portion. [E6] The lid according to any one of [E1] to [E5] above, wherein the small wall portion has a base end and a front edge portion, and wherein the width of the small wall joint portion increases from the base end of the small wall portion toward the front edge portion. [E7] The lid according to any one of [E1] to [E6] above, wherein the side wall portion and the bent portion are made of a resin film member. [E8] The lid according to any one of [E1] to [E7] above, wherein the small wall portion is made of a resin film member.[E9] The lid according to any one of [E1] to [E7] above, wherein the side wall portion, the curved portion, and the small wall portion are made of a resin film member. [E10] The lid according to any one of [E1] to [E9] above, wherein the curved portion is formed by a protruding portion. [E11] The lid according to [E10] above, wherein a convex portion is formed continuous with the end of the protruding portion and protruding in a direction from the outer peripheral surface of the side wall portion toward the inner peripheral surface. [E12] The lid according to any one of [E1] to [E11] above, wherein a fiber-containing sheet is disposed on the underside of the top surface portion. [E13] The lid according to any one of [E10] to [E12] above, wherein a fiber-containing sheet is disposed on the inner surface of the protruding portion. [E14] The lid according to any one of [E1] to [E13] above, wherein a fiber-containing sheet is disposed so as to connect adjacent small wall portions. [E15] A lid blank for forming the lid according to any one of [E1] to [E14] above, comprising 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. [E16] The lid blank according to [E15] above, wherein the blank is formed from a circular sheet material, and the second corresponding portion has a cut portion extending inward from the outer periphery of the sheet material, and when the lid is formed, the portion between adjacent cut portions corresponds to the small wall portion. [E17] The lid blank according to [E16] above, wherein a fiber-containing sheet is disposed on the sheet material, and the sheet material and the fiber-containing sheet are partially bonded. [E18] The lid blank according to [E16] or [E17] above, wherein the fiber-containing sheet is formed in a gear shape. [E19] A combination of a lid and a container, comprising the lid according to any one of [E1] to [E18] above and the container having the opening and the edge portion forming the opening. [E20] A container with a lid, comprising the lid according to any one of [E1] to [E18] above and the container having the opening and the edge portion forming the opening, and having a structure in which the lid is attached to the container.

[0159] DESCRIPTION OF SYMBOLS 10: Lid 11: Top surface 11A: Outer peripheral edge 11B: Bottom surface 12: Bent portion 13: Side wall portion 13A: Inner peripheral surface 13B: Outer peripheral surface 13C: Bottom end 14: Small wall portion 14A: First small wall portion 14B: Second small wall portion 14C: Third small wall portion 15: Small wall joint portion 16: Hole portion 17: Through portion 18: Mouth-forming structure 18A: Small opening portion 18B: Small lid portion 18C: Hinge portion 18D: Base portion 19: Tab member 20: Nonwoven fabric 21: Pad sheet 22: Small hole portion 23: Opening 24: Recessed portion 25: Convex portion 26: Protruding portion 26A: Inner surface 27: Retracted portion 28: End portion 28A: End portion 30: Portion 31: Base end portion 31A: End portion 31B: End portion 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 37: Base end 38: Tip portion 39: Folded structure portion 39A: First folded portion 39B: Second folded 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: Fold margin portion 52: First corresponding portion 53: Second corresponding portion 54: Cut 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 protruding portion 65 : Structural portion 66 : Flared portion 67 : Vertical pleat structure 68 : Inward folded portion 70 : Designated portion identification mark 71 : Concave-convex portion 72 : Convex-shaped portion 73 : Concave-shaped portion 74 : Curved portion 80 : Fiber-containing sheet 81 : Joint portion 82 : Non-joined portion 83 : Gap 84 : Annular portion 85 : Extension piece portion 86 : Joint portion 87 : Circular portion 88 : Outer portion 89 : Inner portion 90 : Penetration portion 91 : Fiber 92 : Hole-shaped portion 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 surface portion 112 : Upper end 113 : Inner peripheral surface portion 114 : Gap 150 : Container with lid151: Contact area AR1: Arrow AR2: Arrow BM: Bending axis BM1: Bending axis BM2: Bending axis CB: Center CT: Center D: Arrow DE: Boundary EI: Area F1: Arrow F1A: Arrow F2: Arrow F3: Arrow FD: Arrow H1: Distance MC: Dash line MR: Dashed line P1: Reference position P2: Specified position R: Contact area SR1: Area SR2: Area T: Stress V1: Arrow WK: Area

Claims

1. A lid configured to be attached to a container having an opening and an edge which defines the opening, and having a top surface which covers the opening when attached to the container, and a side wall formed in a ring shape along the outer periphery of the top surface, and a curved portion at the outer periphery of the top surface, and a plurality of small wall portions which are connected to the top surface via the curved portion so as to surround the periphery of the top surface, wherein the curved portion forms a boundary between the top surface and the side wall portion, and the side wall portion has a structure formed by the plurality of small wall portions and has an overlapping portion where adjacent small wall portions partially overlap, and a small wall joint portion which joins adjacent small wall portions is formed in the overlapping portion.

2. The lid according to claim 1, wherein the small wall portion has an inner surface having an inner surface facing the container when attached to the container, and an outer surface which is the opposite surface to the inner surface, and when the 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 outer surface of the first small wall portion and the inner surface of the second small wall portion are joined together.

3. The lid according to claim 1, 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 according to claim 1, wherein the side wall portion is tapered from the bent portion toward the lower end of the side wall portion.

5. The lid according to claim 1, wherein said side wall portion is tapered from said bent portion toward the lower end of said side wall portion.

6. A lid as claimed in claim 1, wherein the small wall portion has a base end and a front edge portion, and the width of the small wall joint portion has a portion which increases from the base end portion of the small wall portion towards the front edge portion.

7. The lid according to claim 1, wherein the side wall portion and the curved portion are made of a resin film material.

8. The lid according to claim 1, wherein the small wall portion is made of a resin film member.

9. The lid according to claim 1, wherein the side wall portion, the curved portion and the small wall portion are made of a resin film material.

10. The lid of claim 1, wherein the bent portion is formed by a protruding portion.

11. The lid according to claim 10, wherein a convex portion is formed that is continuous with the end of the protruding portion and protrudes in a direction from the outer circumferential surface of the side wall portion toward the inner circumferential surface.

12. The lid according to claim 1, wherein a fiber-containing sheet is disposed on the underside of the top surface.

13. The lid according to claim 10, wherein a fiber-containing sheet is disposed on the inner surface of the protruding portion.

14. The lid according to claim 1, wherein a fiber-containing sheet is disposed so as to connect adjacent small wall portions.

15. A blank material for forming the lid according to claim 1, 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.

16. A lid blank as claimed in claim 15, wherein the blank is formed from a circular sheet material, the second corresponding portion has a cut portion extending inward from the outer periphery of the sheet material, and when the lid is formed, the portion between adjacent cut portions corresponds to the small wall portion.

17. A closure blank according to claim 16, wherein a fiber-containing sheet is disposed on the sheet material, and the sheet material and the fiber-containing sheet are partially bonded together.

18. The closure blank according to claim 17, wherein the fiber-containing sheet is formed in a gear shape.

19. A lid and container combination comprising: the lid of claim 1; and the container having the opening and the edge that forms the opening.

20. A container with a lid, comprising: the lid according to claim 1; and a container having an opening and an edge portion that forms the opening, the lid being attached to the container.

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