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

Abstract

A lid is configured to be attached to a container that has an opening and a rim that forms the opening. When attached to the container, the lid includes a top surface that covers the opening, an annular side wall that connects the rim and is formed along the outer peripheral rim of the top surface. The lid also includes a bend part at the outer peripheral rim of the top surface, and a plurality of small walls connected to the top surface through the bend part, surrounding its periphery. The bend part defines a boundary between the top surface and the side wall. The side wall includes a plurality of small walls and has overlaps where adjacent small walls partially overlap. Within these each overlap, a small wall joint part is formed to join the adjacent small walls.

Description

Technical Field

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

[0002] In stores such as convenience stores and fast-food restaurants, it is common practice to provide food and drink items, etc. (hereinafter called as “contents”), contained in a container that has an opening, a rim that forms the opening, and a space that is formed inward from the opening. When the contents are supplied to customers, they are often provided with a lid attached to the container. In this case, by attaching a lid to the container with the contents already contained inside, the contents are often provided in a container with lid (i.e., in a packaged).

[0003] As the lid, there is known a lid having a top surface and a side wall surrounding the periphery of the top surface. For a container with lid, the side wall of the lid is fitted onto the rim of the container. Conventionally, lids have been widely formed from molded plastic. However, in the light of reducing environmental load, there is a demand for lids to be formed from lower use of plastic material as much as possible. Thus, what proposed is a lid formed by using a paper-based material (Patent Literature 1).Citation ListPatent Literature

[0004] Patent Literature 1: JP 2020-37433ASUMMARY OF THE INVENTIONTechnical Problem

[0005] In Patent Literature 1, a lid is formed by shaping a blank material, and a top surface and a side wall of the lid are continuous. With such a lid, the portion that includes the side wall and contacts the container is typically formed with numerous wrinkles or pleat-like structures, which may reduce the sealing performance of the container with lid.

[0006] In the light of suppressing a large number of wrinkles or pleat-like configuration provided over the entire contact area between the lid and the container, it can be expected that the lid is configured to have the top surface and the side wall, which are formed separately, and a member forming the side wall is bonded to a periphery of the top surface afterwards.

[0007] Supposing that the side wall of the lid is formed of a paper-based material, the side wall increases firmness, resulting in making it difficult to fit the lid onto the container if the container is larger than an expected size among some sizes.

[0008] Even when the lid is formed of a paper-based material and used as a combination of a container with lid, there are situations where improvements can be made to prevent a reduction in the sealing performance of the container with lid and to readily fit onto the container even if dimensions of the container change.Solution to Problem

[0009] The gist of the present invention is (1) to (21).

[0010] (1) A lid configured to be attachable to a container having an opening and a rim that forms the opening, the lid in an attachment to the container comprising:

[0011] a top surface covering the opening,

[0012] a side wall formed circularly along an outer peripheral rim of the top surface,

[0013] a bend part at the outer peripheral rim of the top surface; and

[0014] a plurality of small walls in contact with the top surface through the bend part to surround the periphery of the top surface, wherein

[0015] the bend part forms a boundary between the top surface and the side wall,

[0016] the side wall has a structure formed by a plurality of the small walls and overlaps by the small walls in partially overwrapping with adjacent small walls, wherein

[0017] a plurality of small wall joint parts is formed in the overlaps to join the adjacent small walls.

[0018] (2) The lid according to (1), wherein each small wall includes an inner surface facing the container and an outer surface and is designated as a first small wall or a second small wall in each adjacent arrangement, a small wall joint part being configured to join the outer surface of the first small wall to the inner surface of the second small walls.

[0019] (3) The lid according to (1), wherein each small wall has a proximal end and a tip end and the width of at least a part of the small wall is larger at the tip end than at the proximal end.

[0020] (4) The lid according to (1), wherein each side wall has a shape that tapers from the bend part toward the tip end of the small wall.

[0021] (5) The lid according to (1), wherein each small wall includes a proximal end and a tip end, and each small wall joint part includes a part whose width increases gradually in a direction from the proximal end toward the tip end of the small wall.

[0022] (6) The lid according to (1), wherein the side wall and the bend part include a paper-based material.

[0023] (7) The lid according to (1), wherein each small wall has at least one resin layer.

[0024] (8) The lid according to (1), wherein the bend part is formed by an overhang.

[0025] (9) The lid according to (8), wherein a protrusion projects in a direction from the outer peripheral surface towards the inner peripheral surface of the side wall.

[0026] (10) The lid according to (1), wherein a fiber-containing sheet is arranged on the undersurface of the top surface.

[0027] (11) The lid according to (8), wherein a fiber-containing sheet is arranged on the inner surface of the overhang.

[0028] (12) The lid according to (1), wherein a fiber-containing sheet is arranged so as to connect adjacent small walls.

[0029] (13) The lid according to (1), wherein the bend part includes a sheet material and a fiber-containing sheet, and is formed by an overhang that has a space interposed between the sheet material and the fiber-containing sheet on the inner surface the overhang.

[0030] (14) The lid according to (1), wherein a small opening is provided in the top surface, and a groove connected to the small opening is formed.

[0031] (15) The lid according to (1), further comprising a concave structure and a drinking spout forming structure on the top surface, wherein the drinking spout forming structure is arranged inside the concave structure in a plan view of the top surface.

[0032] (16) A blank material for a lid for forming the lid according to (1), comprising a first corresponding part in accordance with the top surface, and a second corresponding part formed in a shape in accordance with the side wall.

[0033] (17) The blank material for a lid according to (16), wherein the blank material is formed from a circular sheet material, and the second corresponding part includes a plurality of cut lines extending inward from the outer peripheral rim of the sheet material such that the regions between adjacent cut lines correspond to the small walls once the lid formed.

[0034] (18) The blank material for a lid according to (17), wherein a fiber-containing sheet is arranged on the sheet material, and the sheet material and the fiber-containing sheet are partially joined.

[0035] (19) The blank material for a lid according to (18), wherein the fiber-containing sheet is formed in a gear shape.

[0036] (20) A combination of a lid and a container, comprising the lid according to (1) and the container having an opening and the rim forming the opening.

[0037] (21) A container with lid, comprising the lid according to (1) and the container having the opening and the rim that forms the opening, wherein the lid is configured to be attached to the container.Advantageous Effects of Invention

[0038] According to the present invention, it is possible to realize a lid, a blank material for a lid, a combination of a lid and a container, and a container with lid that, even when being formed of a paper-based material and used as a combination of container with lid, can prevent a reduction in the sealing performance of the container with lid and to readily fit onto the container even if there are variations in the container's dimensions.BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1FIG. 1A is a plan view for explaining one example of a lid according to the first embodiment. FIG. 1B is a side view for explaining one example of a lid according to the first embodiment. FIG. 1C is a cross-sectional view schematically showing an A-A line vertical section of FIG. 1A. FIG. 1D is a cross-sectional view schematically showing a B-B line vertical section of FIG. 1B.

[0040] FIG. 2A is a plan view for explaining one example of a sheet of blank material for forming a lid according to the first embodiment. FIG. 2B is a cross-sectional view schematically showing a C-C line vertical section of FIG. 2A. FIG. 2C is a diagram for explaining one example of shaping the blank material. FIG. 2D is a diagram for explaining the blank material in FIG. 2C viewed in the direction of arrow D as the line of sight.

[0041] FIGS. 3A-3D are plan views for explaining a modified example of the lid according to the first embodiment.

[0042] FIG. 4A is a plan view showing another example of a sheet of blank material. FIG. 4B is a cross-sectional view schematically showing an E-E line vertical section of FIG. 4A.

[0043] FIG. 5A is a plan view for explaining another example of a sheet of blank material.

[0044] FIG. 5B is a cross-sectional view for explaining another example of a blank material.

[0045] FIG. 6FIGS. 6A and 6B are cross-sectional views for explaining one example of a lid according to the first embodiment.

[0046] FIGS. 7A, 7B, and 7C are cross-sectional views for explaining one example of a lid according to the first embodiment.

[0047] FIG. 8A is a plan view for explaining one example of a lid according to the third embodiment. FIG. 8B is a side view for explaining one example of a lid according to the third embodiment. FIG. 8C is a cross-sectional view schematically showing the a F-F line vertical section of FIG. 8A.

[0048] FIG. 9A is a plan view for explaining one example of a lid according to the first embodiment. FIG. 9B is a side view for explaining one example of a lid according to the first embodiment. FIG. 9C is a plan view for explaining one example in use of the lid shown in FIG. 9A.

[0049] FIG. 10A is a plan view for explaining one example of a lid according to the first embodiment. FIG. 10B is a side view for explaining one example of a lid according to the first embodiment.

[0050] FIG. 11A is a plan view for explaining one example of a lid according to the second embodiment. FIG. 11B is a side view for explaining one example of a lid according to the second embodiment. FIG. 11C is a cross-sectional view schematically showing a G-G line vertical section of FIG. 11A.

[0051] FIG. 12A is a plan view for explaining one example of a lid according to the first embodiment. FIG. 12B is a cross-sectional view schematically showing a H-H line vertical section of FIG. 12A.

[0052] FIGS. 13A, 13B, 13C, 13D, 13E, 13F, and 13G are plan views for explaining one example of a lid according to the first embodiment.

[0053] FIG. 14A is a plan view for explaining one example of a lid according to the third embodiment. FIG. 14B is a side view for explaining one example of a lid according to the third embodiment. FIG. 14C is a cross-sectional view schematically showing an I-I line vertical section of FIG. 14A.

[0054] FIG. 15A is a plan view for explaining one example of a lid according to the third embodiment. FIG. 15B is a cross-sectional view schematically showing a J-J line vertical section of FIG. 15A.

[0055] FIG. 16 is a diagram for explaining one example of shaping the blank material.

[0056] FIGS. 17A and 17D are cross-sectional views for explaining one example of a lid according to the first embodiment. FIG. 17B is a cross-sectional view for explaining one example of a lid according to the third embodiment. FIG. 17C is a cross-sectional view for explaining one example of a lid according to the second embodiment.

[0057] FIGS. 18A and 18D are cross-sectional views for explaining one example of a lid according to the first embodiment. FIG. 18B is a cross-sectional view for explaining one example of a lid according to the third embodiment. FIG. 18C is a cross-sectional view for explaining one example of a lid according to the second embodiment.

[0058] FIG. 19A is a perspective view for explaining one example of a container with lid. FIG. 19B is a cross-sectional view schematically showing a K-K line vertical section of FIG. 19A. FIG. 20 is a partial cross-sectional view for explaining one example of a container with lid when the lid has an overhang.

[0059] FIG. 21A is a plan view for explaining one example of a lid according to the fourth embodiment. FIG. 21B is a side view for explaining one example of a lid according to the fourth embodiment. FIG. 21C is a cross-sectional view schematically showing a L-L line vertical section of FIG. 21A.

[0060] FIG. 22 is a side view for explaining one example of a lid according to the sixth embodiment.

[0061] FIG. 23A is a side view for explaining one example of a lid according to the fifth embodiment. FIG. 23B is a cross-sectional view for explaining one example of a lid according to the fifth embodiment.

[0062] FIG. 24 is a plan view for explaining one example of Modified Example 3 of the third embodiment.

[0063] FIGS. 25A and 25B are cross-sectional views for explaining one example in attaching the lid according to the first embodiment to a container.

[0064] FIG. 26A is a cross-sectional view for explaining one example in attaching the lid according to the third embodiment to a container. FIG. 26B is a cross-sectional view and a partially enlarged cross-sectional view for explaining one example in attaching the lid according to the third embodiment to a container.

[0065] FIG. 27 is a partial cross-sectional view for explaining one example in attaching the lid according to the fourth embodiment to a container.

[0066] FIG. 28A is a plan view for explaining one example of the first example of Modified Example 9 of the first embodiment. FIG. 28B is a cross-sectional view schematically showing a M-M line vertical section of FIG. 28A.

[0067] FIG. 29A is a plan view for explaining one example of the second example of Modified Example 9 of the first embodiment. FIG. 29B is a cross-sectional view schematically showing a N-N line vertical section of FIG. 29A.

[0068] FIG. 30A is a plan view for explaining one example of the third example of Modified Example 9 of the first embodiment. FIG. 30B is a cross-sectional view schematically showing an O-O line vertical section of FIG. 30A.

[0069] FIG. 31A is a plan view illustrating one example of Modified Example 10 of the first embodiment. FIG. 31B is a schematic cross-sectional view showing a P-P line vertical section of FIG. 31A.

[0070] FIG. 32A is a plan view illustrating a fiber-containing sheet used in one example of Modified Example 10 of the first embodiment. FIG. 32B is a bottom view illustrating a sheet of blank material used in one example of Modified Example 10 of the first embodiment.

[0071] FIG. 33 is a side view illustrating one example of Modified Example 10 of the first embodiment.

[0072] FIG. 34A is a plan view illustrating one example of a lid according to the seventh embodiment. FIG. 34B is a schematic cross-sectional view showing a Q-Q line vertical section of FIG. 34A.

[0073] FIG. 35A is a plan view illustrating one example of a lid according to Modified Example 1 of the seventh embodiment. FIG. 35B is a schematic cross-sectional view showing a R-R line vertical section of FIG. 35A. FIG. 35C is a schematic partially enlarged cross-sectional view showing an enlarged region EI enclosed by the dashed-dotted line in FIG. 35B.

[0074] FIG. 36A is a plan view illustrating one example of a lid according to Modified Example 2 of the seventh embodiment. FIG. 36B is a schematic cross-sectional view showing a S-S line vertical section of FIG. 36A. FIG. 36C is a side view illustrating one example of a lid according to Modified Example 2 of the seventh embodiment.

[0075] FIG. 37A is a plan view illustrating one example of a lid according to Modified Example 3 of the seventh embodiment. FIG. 37B is a schematic cross-sectional view showing a T-T line vertical section of FIG. 37A.

[0076] FIG. 38A is a bottom view illustrating one example of a sheet of blank material that can be used when producing one example of a lid according to Modified Example 3 of the seventh embodiment. FIG. 38B is a schematic cross-sectional view showing a U-U line vertical section of FIG. 38A.

[0077] FIGS. 39A-39C are enlarged plan views illustrating one example of a fiber-containing sheet.

[0078] FIGS. 40A and 40B are cross-sectional views illustrating one example of a lid according to the seventh embodiment.

[0079] FIG. 41 is a partial cross-sectional view illustrating one example of the lid attached to a container according to the seventh embodiment.

[0080] FIG. 42A is a perspective view illustrating an overlap of small walls in one example of the first embodiment. FIG. 42B is a schematic plan view showing FIG. 42A viewed with an inner-outer direction as the line of sight. FIG. 42C is a schematic cross-sectional view showing an A1-A1 line vertical section of FIG. 42B.

[0081] FIG. 43A is a perspective view illustrating an overlap of small walls in one example of Modified Example 11 of the first embodiment. FIG. 43B is a schematic plan view showing FIG. 43A viewed with the inner-outer direction as the line of sight. FIG. 43C is a schematic cross-sectional view showing a A2-A2 line vertical section of FIG. 43B.

[0082] FIG. 44A is a perspective view illustrating an overlap of small walls in one example of Modified Example 12 of the first embodiment. FIG. 44B is a schematic plan view showing FIG. 44A viewed with the inner-outer direction as the line of sight. FIG. 44C is a schematic cross-sectional view showing a A3-A3 line vertical section of FIG. 44B.

[0083] FIGS. 45A-45C are diagrams showing one example of a blank material for producing the lid according to the first embodiment.

[0084] FIG. 46A is a perspective view illustrating an overlap of a small walls in one example of Modified Example 13 of the first embodiment. FIG. 46B is a schematic plan view showing

[0085] FIG. 46A viewed with the inner-outer direction as the line of sight. FIG. 46C is a schematic cross-sectional view showing a A4-A4 line vertical section of FIG. 46B.

[0086] FIG. 47 is a diagram showing one example of a blank material for producing the lid according to Modified Example 13 of the first embodiment.

[0087] FIG. 48A is a cross-sectional view illustrating a lid according to Modified Example 12 of the first embodiment. FIG. 48B is a cross-sectional view illustrating an example of a lid where Modified Example 12 of the first embodiment is applied to the seventh embodiment.

[0088] FIG. 48C is a cross-sectional view illustrating a lid according to Modified Example 4 of the seventh embodiment.

[0089] FIGS. 49A and 49B are plan views showing one example of a sheet of blank material for producing the lid according to the first embodiment.

[0090] FIGS. 50A and 50B are schematic cross-sectional views illustrating one example of a lid according to the fourth embodiment.

[0091] FIGS. 51A and 51B are schematic cross-sectional views illustrating one example of a lid according to a modified example of the fourth embodiment.

[0092] FIG. 52A is a schematic plan view illustrating one example of a lid according to the eighth embodiment. FIG. 52B is a schematic side view illustrating one example of a lid according to the eighth embodiment. FIG. 52C is a schematic cross-sectional view showing a B1-B1 line vertical section of FIG. 52A. FIG. 52D is a schematic cross-sectional view showing a B2-B2 line vertical section of FIG. 52A.

[0093] FIG. 53 is a schematic cross-sectional view illustrating one example of a lid according to the eighth embodiment.

[0094] FIG. 54A is a schematic plan view illustrating one example of a lid according to the eighth embodiment. FIG. 54B is a schematic side view illustrating one example of a lid according to the eighth embodiment. FIG. 54C is a schematic cross-sectional view showing a B3-B3 line vertical section of FIG. 54A.

[0095] FIG. 55A is a plan view showing one example of a sheet of blank material for producing a lid according to the tenth embodiment. FIG. 55B is a bottom view showing one example of a sheet of blank material for producing a lid according to the tenth embodiment.

[0096] FIG. 55C is a schematic cross-sectional view showing a B4-B4 line vertical section of FIG. 55A.

[0097] FIG. 56A is a schematic partial cross-sectional view illustrating one example of a lid according to the tenth embodiment. FIG. 56B is a schematic partial cross-sectional view illustrating one example of a container with lid in which the lid according to the tenth embodiment is attached to a container.

[0098] FIG. 57A is a schematic partial cross-sectional view illustrating one example of a lid according to the tenth embodiment. FIG. 57B is a schematic partial cross-sectional view illustrating one example of a container with lid in which the lid according to the tenth embodiment is attached to a container.

[0099] FIG. 58A is a schematic plan view illustrating one example of a lid according to the tenth embodiment. FIG. 58B is a schematic cross-sectional view showing a B5-B5 line vertical section of FIG. 58A.

[0100] FIG. 59A is a schematic plan view illustrating one example of a lid according to the ninth embodiment. FIG. 59B is a schematic cross-sectional view showing a B6-B6 line vertical section of FIG. 59A.DESCRIPTION OF EMBODIMENTS

[0101] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The descriptions will be in order as: 1. First Embodiment, 2. Second Embodiment, 3.Third Embodiment, 4. Fourth Embodiment, 5. Fifth Embodiment, 6. Sixth Embodiment, 7. Seventh Embodiment, 8. Eighth Embodiment, 9. Ninth Embodiment, 10. Tenth Embodiment, and 11. Application Examples. In this specification and the drawings, the substantially same functional configurations are denoted by the same reference numerals to omit redundant explanations.

[0102] The following description provides preferred specific examples of the present invention, which are not limited to the embodiments described. Furthermore, directions such as front-back, left-right, and up-down are indicated for simplified explanation, but not limited to them. In FIGS. 1 and 2, a Z-axis direction is defined as an up-down direction (upper side is +Z direction, lower side is a −Z direction), a X-axis direction as a front-back direction (front side is +X direction, a back side is −X direction), and a Y-axis direction as a left-right direction (right side is +Y direction, left side is −Y direction), and the description will be based on these definitions. This also applies to FIGS. 3-59.

[0103] The relative size and thickness ratios of each layer shown in FIG. 1 and others are for convenience of description and not limit to actual size ratios. These definitions regarding directions and size ratios also apply to FIGS. 2-59.

[0104] The lid according to the present invention will be described using a lid for a container (cup) that holds various liquids such as coffee as an example. However, the present invention is not limited to lids for containers holding beverages and can also be applied as lids for containers holding food items other than beverages. Furthermore, the lid according to the present invention can also be applied to containers capable of holding various items other than food and beverages, such as parts like bolts and nuts, or others not mentioned above. Moreover, in the following description, the lid according to the present invention will be explained using an example where its shape in a plan view is circular. However, the shape of the lid is not limited to this but also be applicable to various shapes other than circular, such as elliptical, rectangular, polygonal like triangular, chamfered rectangular, chamfered polygonal, and the like. However, it is preferable that the lid is attached to a container storing a fluid as its contents for further enhancing the effects of the present invention. The term “fluid” includes not only substances with fluidity, such as liquids and powders, but also combinations of liquids and solids.1. First Embodiment1-1 Lid

[0105] The lid 10 according to the first embodiment of the present invention can be used (as a container with lid 150) by being attached (fitted) to the rim 103 of the opening 102 of a container 101, as described afterwards with reference to FIG. 19 and the related drawings.

[0106] The lid 10 is configured to form a contact region R that comes into contact with the rim 103 of the container 101 at the opening 102.

[0107] As shown in FIGS. 1A-1D, the lid 10 includes a top surface 11 and a side wall 13, with the top surface 11 and the side wall 13 being continuous at a bend part 12 interposed. FIGS. 1A-1D are diagrams for explaining one example of the lid 10. While the container 101 with little or non-flexibility, such as a metal container is not exempted, the effect of using the lid 10 of the present invention can be enhanced when the container has the flexible rim for the opening 102. To enhance the effectiveness of using the lid 10 of the present invention, it is particularly preferable that the container 101 is made of a paper-based material, similar to the material of the lid 10 as described later.Top Surface

[0108] As shown in FIGS. 1A-1D, the top surface 11 is where the opening 102 of the container 101 is covered by the lid 10 being attached (mounted) to the container 101. The shape of the top surface 11 may be defined depending on the shape of the container 101, and may include, e.g., circular, elliptical, triangular, rectangular, polygonal, or chamfered configurations.Bend Part

[0109] The bend part 12 is formed to encircle the outer peripheral rim of the top surface 11, and is formed to be a boundary between the top surface 11 and the side wall 13. As the lid 10 is mounted on the container 101, the side wall 13 becomes facing the side wall 104 or the rim 103 of the container. Although the bend part 12 includes a folded structure as shown in FIGS. 1A-1D, it is not limited to this as explained later. The term “the boundary between the top surface 11 and the side wall 13” formed includes not only a boundary on the spot but also boundaries defined by ends or an inner part within the bed part, if any (where a part of the top surface 11 and / or side wall 13 shares a part of the bend part 12.) FIGS. 1A-1D show the bend part 12 formed at the border between the top surface 11 and the side wall 13, by which both are separated. The boundary is defined at the center of the bend part 12. As illustrated in FIG. 7A and the related figures, the bend part 12 is comprised of a part defined within a range curved. It results in the boundary between the top surface 11 and the side wall 13 defined at the approximately center of the bend part 12. The same applies when an overhang 26, as described later, comprises the bend part 12.Side Wall

[0110] The side wall 13 is formed in an annular shape in accordance with the outer peripheral end 11A of the top surface 11. The side wall 13 has a plurality of small walls 14, which will be described later, and also has overlaps 30 where adjacent small walls 14 partially overlap. A plurality of small wall joint parts 15 for joining adjacent small walls 14 are formed in the overlaps 30.Overall Shape of the Side wall The shape of the side wall 13 is not particularly limited, but in FIGS. 1A-1D, the overall shape of the side wall 13 is tapered in the downward direction (−Z direction) along the vertical direction, from the bend part 12 towards the tip end of the small walls 14. The term ‘tapered’ here is called as a shape of the cross-section of the side wall 13, as viewed from the top of the lid 10 (i.e., cross-section of the side wall 13 cut parallel to the XY-plane), has a smaller diameter at a certain position lower than the bend part 12 than at a position closer to the bend part 12. As shown in FIGS. 1A-1D, the cross-section of the side wall 13 gets smaller as it moves away from the bend part 12. The side wall 13 has an inner peripheral surface 13A and an outer peripheral surface 13B and both are preferably taper shape, as illustrated in FIGS. 1A-1D.Small Wall

[0111] The lid 10 has a plurality of small walls 14, which are formed so as to contact with the top surface 11 via the bend part 12. Each small wall 14 has a proximal end 31 and a tip end 32, with the proximal end 31 being formed at the bend part 12, and the tip end 32 being formed at a lower end of the side wall 13. In FIGS. 1A-1D, the proximal end 31 is formed at the upper end of the side wall 13, but this is merely one example.

[0112] Parts of the outer periphery of the small walls 14, excluding the proximal end 31 and the tip end 32, form side ends 33. While there are no particular limitations on the side ends 33 as long as they can form the overlaps 30 as described later, one side end 33 of adjacent small walls 14 and the other side end 33 facing the said one side end 33 are preferably formed parallel to each other in the blank material 50, as will be described later. The side ends 33 extend linearly outward (in the radial direction of the blank material 50) from a center of the blank material 50 (CB in FIG. 2A) in a plan view of the blank material 50 as described later. Each small wall 14 is formed from an individual folding allowance 51 in the blank material 50 as described later. In the example where the blank material 50 shown in FIG. 2A is shaped to form the lid 10 of FIG. 1A, the center CB of the blank material 50 is approximately placed at a center CT of the lid 10.

[0113] The small walls 14 are formed so as to surround the outer peripheral end 11A of the top surface 11. Specifically, multiple small walls 14 are arranged along the bend part 12 in the peripheral direction of the top surface 11. Adjacent small walls 14 in this peripheral arrangement partially overlap one another. The overlapping may be configured for all small walls 14 arranged in the peripheral direction of the top surface 11. Among the side ends 33 of the small walls 14, the side end located on the +X direction in FIGS. 1A-1B is defined as a first side end 33A, and the side end on the −X direction is defined as a second side end 33B. When observing the side ends 33 of the small walls 14, the direction from the first side end 33A to the second side end 33B corresponds to the clockwise direction around the top surface 11. As shown in FIG. 1B, the first side end 33A is positioned on the inner peripheral surface 13A of the side wall 13, while the second side end 33B is positioned on the outer peripheral surface 13B of the side wall 13. This is merely one example and does not limit overlapping possibilities configurated with adjacent small walls 14.

[0114] In FIGS. 1B-1D, the small walls 14 have inner surfaces 34 that face the container 101 when attached to the container 101, and outer surfaces 35 that are opposite surface to the inner surfaces 34. The exposed portion of the inner surfaces 34 of the small walls 14 form the inner peripheral surfaces 13A of the side wall 13. The exposed portion of the outer surface 35 of the small walls 14 form the outer peripheral surfaces 13B of the side wall 13 in FIGS. 1B-1D.

[0115] Each small wall 14 doesn't have particular limitation in size, but it is preferable that the tip end of at least a part of the small wall 14 is larger than the proximal end of at least a part of the small wall 14. As shown in FIG. 1B, it is preferable that the width WN of the small wall 14 gradually increases from the proximal end 31 towards the tip end 32. A fan shape as such for the small wall 14 can be exemplified.

[0116] It is preferable that a resin layer (preferably a thermoplastic resin layer) is formed on at least one of the inner surfaces 34 or the outer surfaces 35 of the small walls 14. When the lid 10 is formed of the blank material 50, as described later, each small wall joint part 15 is readily formable in the overlaps 30 by applying heat treatment or ultrasonic welding. This can be achieved by using a sheet material having a resin layer on at least one surface as the material for the lid 10 (as the material for the blank 50). Specific examples of the sheet material include those having a laminated structure of a layer formed of a paper-based material (e.g., paper) and a resin layer (e.g., coated paper).Overlap

[0117] The overlaps 30 are formed in the side wall 13 and defined as regions where adjacent small walls 14 overlap. As shown in FIGS. 1A-1D, when each surface of the small wall 14 that faces the container 101 upon attachment is defined as the inner surface 34, the opposite surface is defined as the outer surface 35, and the overlap 30 is defined as a portion where the inner surface 34 of one small wall 14 faces the outer surface 35 of the adjacent small wall 14. In FIGS. 1A-1D, when each adjacent small wall 14 is defined as a first small wall 14A and a second small wall 14B (e.g., when the direction from the first small wall 14A to the second small wall 14B is clockwise), the inner surface 34 of the first small wall 14A faces the outer surface 35 of the second small wall 14B.

[0118] Although the region where each overlap 30 is located is not particularly limited, it is preferable to include a portion where the width of the overlap 30 increases in the direction from the proximal end 31 to the tip end 32 of the small wall 14. As illustrated in FIGS. 1A-1D, each region of the overlap 30 shapes such that the width WK gradually increases in the direction from the proximal end 31 to the tip end 32. As each region WK of the overlap 30 formed as described above, each region of the small wall joint part 15, as described later, is arranged identical to the overlap 30, thereby making it easier to form structural effect of the small wall joint part 15. The width WK of each overlap 30 (as shown in FIG. 1) represents a dimension along the surface of the overlap 30 measured in a direction parallel to a straight-line M that connects both ends 31A and 31B of the proximal end 31 of the small wall 14.

[0119] In the lid 10 according to the first embodiment, as illustrated in FIGS. 42A-42C and related drawings, each overlap 30 between adjacent small walls 14 may be formed in the region between the side end 33 of one small wall 14 and the side end 33 of the other small wall 14, when viewed in the inner-to-outer direction (i.e., from the inner peripheral surface 13A to the outer peripheral surface 13B of the side wall 13, which is considered the outward line of sight). Each side end 33 may also constitute part of the contour of each overlap 30. In FIGS. 42A-42C, each overlap 30 is formed in the region surrounded with the second side end 33B of the first small wall 14A, the first side end 33A of the second small wall 14B, and the tip end 32, when viewed from the outer-to-inner direction (i.e., from the outer peripheral surface 13B to the inner peripheral surface 13A of the side wall 13). FIG. 42A is a perspective view illustrating the overlap between small walls 14. For simplified explanation, only two small walls 14 are shown in FIG. 42A, and others are omitted. This is also applied to FIG. 42B, 43A-43B, and 44A-44B as described later. FIG. 42B is a schematic plan view showing the configuration of FIG. 42A as seen from the inner to-outer direction. FIG. 42C is a schematic cross-sectional view of an A1-A1 line vertical section of FIG. 42B.

[0120] Two side ends 33 that define the outline of each region that comes into the overlap 30 in FIGS. 42A and 42B may be positioned in such a way that any distortion is formed in a direction from an edge 38 toward a base 37 between a specified range from the vicinity of the base 37 to the base 37. In FIG. 42A, the side surface that forms the first side end 33A is distorted so as to face the inner surface 34 of the first small wall 14A upon being oriented from the edge 38 to the base 37. Similarly, the side surface that forms the second side end 33B is distorted so as to face the outer surface 35 upon being oriented from the edge38 to the base 37. As shown in FIG. 42A together with FIGS. 42B and 42C, both arrangements such as the inner surface 34 of the first small wall 14A and the outer surface 35 of the second small wall 14B in facing inwardly and / or outwardly each other at the base 37 may be excluded from creating. In FIGS. 424-430, the inner surface 34 of the first small wall 14A or the outer surface 35 of the second small wall 14B may be oriented to face in the peripheral direction (i.e., along the peripheral surface of the side wall 13). Here, a pleat-like structure (vertical pleat structure 67) extending in the direction of the center of the top surface 11 may be locally formed on an adjacent area to the base 37. However, this vertical pleat structure 67 may be partially or entirely avoidable by compressing the blank material 50 at the base 37 with pressing or similar means during the forming the lid 10. In FIGS. 42A-42C, the overlaps 30 come to include the base 37 of the side end 33.Small Wall Joint Part

[0121] In the overlaps 30, the facing surfaces of the small walls 14 are joined each other, and this joined portion are the small wall joint parts 15, which is defined as an area that the outer surface 35 of the first small wall 14A and the inner surface 34 of the second small wall 14B in FIGS. 1A-1D. With the small wall joint parts 15 formed, independent movements between adjacent small walls 14 is restricted, thereby contributing to keep the overall shape of the side wall 13 in balance. Specifically, unlike conventional fine wrinkles or pleat-like wrinkle structures formed by densely shaping the blank material, the small wall joint parts 15 are surface-joined, which enhances keeping the shape of the side wall 13 in balance. This does not exclude to add conventional wrinkle structures to the small wall joint parts 15.

[0122] The regions where the small wall joint parts 15 are formed are not particularly limited as long as allowing to prevent the small walls 14 that comprise the side wall part 13 from freely rotating about the proximal end 31 serving as a pivot. In order to maintain the shape stability of the lid 10, though, suppress a deformation at position away from the bend part 12 (i.e., close to the lower end of the side wall part 13), and allow some deformation at position adjacent to the bend part 12 closer than the lower end of the side wall part 13, it is preferable that a width WD of the small wall joint parts 15 has a portion that increases from the bend part 12 toward the tip end of the small wall 14. The regions where the overlaps 30 are formed are preferably the same as the small wall joint parts 15. By applying thermal bonding (such as heat treatment) or ultrasonic welding to the overlaps 30 formed, the overlaps 30 and the small wall joint parts 15 can be substantially concurrently formed. The width of the small wall joint parts 15 (width WD as shown in FIG. 1) represents one dimension along the surface of the small wall joint parts 15 measured in the direction parallel to the straight-line M. The structure in which the facing surfaces of the small walls 14 that turn into the small wall joint parts 15 are joined each other is provided by fixing the small walls 14 through adhesion or similar means. Specifically, adhesive or resin (e.g., thermoplastic resin) may be placed on at least one of the facing small walls 14 as well as at least a part of each overlap 30 so as to fix. Resin or similar material may be pre-applied (e.g., coated) to one surface of pierces that comes into the small walls 14 (e.g., folding allowances 51) of the blank material 50 as described later, by which the small wall joint parts 15 may be formed by bonding the specified areas of the facing small walls 14 that correspond to the overlaps 30.

[0123] Alternatively, the blank material 50 may be prepared without resin on the portion that comes into the small walls 14 (e.g., folding allowances 51). The resin may then be applied separately to portions of the facing small walls 14 that correspond to the overlaps 30, and the specified areas may be bonded to create the small wall joint parts 15. In order to reduce resin use and lowering environmental impact, applying resin to only either one surface of the small walls 14 is preferable. It is preferable to apply resin to both surfaces of the small wall 14 for reliably forming the overlaps 30.

[0124] In FIGS. 1A-1D, the width WD of each small wall joint part 15 gradually increases from the proximal end 31 of the small wall 14 toward the tip end 32. Such region for each small wall joint part 15 is exemplified as an approximately fan-shaped area (partially overlapping fan shapes).Lid Material

[0125] The material of the lid 10 including the top surface 11, the side wall 13, and the bend part 12 is not particularly limited, and may include paper-based materials, plastics, or metals. However, paper-based materials are preferred. Specifically, in the light of shape retention and environmental sustainability, it is preferable that the side wall 13 and the bend part 12 are made of a paper-based material, and more preferably, that the lid 10 is entirely composed of such material. Examples of paper-based materials include conventional paper formed by depositing a slurry of fibrous raw material onto a wire mesh, followed by drying or press-drying to produce a sheet, and airlaid sheets produced by pulverizing pulp-based raw material into defibrated fibers, accumulating the fibers via an air stream, and fixing them with a binder. In addition, other usable paper-based materials include chemical fiber paper, synthetic paper, water-resistant paper, coated paper, substitute paper, parchment paper, wool paper, glass fiber paper, stone paper, ceramic paper, and laminates thereof. Paper-based materials may consist entirely of pulp or may contain non-pulp natural fibers, synthetic fibers, or recycled fibers. However, it is preferable that the material contains at least 5 mass% pulp, more preferably 70 mass% or more, and even more preferably 80 mass% or more-with 100 mass% pulp being particularly desirable. A higher pulp content is advantageous for improving biodegradability. The lid 10 may also preferably be formed from a laminated material that includes a paper-based layer.1-2 Blank Material for Lid and Producing Method

[0126] The lid 10 in the present invention has a three-dimensional shape as a whole as the top surface 11 and the side wall 13 have different surface directions as shown in FIGS. 1A-1D.

[0127] This three-dimensional shape of the lid 10 can be achieved, e.g., by deforming (shaping) the blank material for the lid into a shape corresponding to that of the lid 10 using a forging device or the like. In this specification, the blank material for the lid may simply be called as a blank material.Blank Material for Lid

[0128] The blank material for a lid (blank material 50) that corresponds to the lid 10 is composed of a sheet-like structure formed into a shape defined in accordance with the lid 10 as shown in FIGS. 1A-1D. The material of the blank material 50 is defined to be the same as that of the lid 10 and when it is sheet-like, it includes that it has a hole 16 and a tab 19, for example, are provided in accordance with the shape and configuration of the lid 10, as described later.

[0129] (First and Second Corresponding Parts) As shown in FIG. 2A, the blank material 50 has a first corresponding part 52 and a second corresponding part 53. The part of the blank material 50 corresponding to the top surface 11 of the lid 10 is the first corresponding part 52, and the part corresponding to the side wall 13 is the second corresponding part 53.

[0130] The blank material 50 corresponding to the lid 10 shown in FIG. 1A may be a circular sheet material 55, as illustrated in FIG. 2A. This blank material 50 includes a plurality of cut lines 54 extending inward from the outer peripheral rim of the sheet material 55. Each part interposed between adjacent cut lines 54 along the outer peripheral rim of the sheet comes into the folding allowance 51, which is bent during the shaping the blank material 50 and forms the second corresponding part 53 when combined (assembled). As shown in FIG. 2B, the blank material 50 is shaped into the lid 10 by bending the folding allowances 51 in the direction of the arrow FD so as to be (or partially to be) the small wall 14. The blank material 50 is may be used as shown in FIG. 5A where it is folded at a position closer to the center than innermost ends 63 of the cut lines 54. The folding allowances are comprised of a plurality of first folding allowances 60 interposed between adjacent cut lines, and a second folding allowance 61 that extends further inward (towards the center of blank material 50) beyond the first folding allowances 60, having a range (from the outer peripheral rim of the sheet material 55 to the axis of folding.) The first folding allowances 60 extend outward from the second folding allowances 61. The second corresponding part 53 is formed by the combination of the plurality of first folding allowances 60 and the second folding allowance 61. The overlaps 30 are created by layers of the first folding allowances 60, which also comprise the small wall 14.Other Example 1 of Blank Material for Lid The blank material for the lid (blank material 50) is not limited to the configuration shown in FIG. 2A. As illustrated in FIGS. 4A and 4B, it may have a plurality of cutouts 56 instead of the cut lines 54. Regions interposed between adjacent cutouts 56 are folding allowances 51. The cutouts 56 may be used together with the cut lines 54. As shown in FIG. 4A, the cutouts 56 are formed to be smaller than the overlaps 30 that are expected to be formed when the lid 10 is manufactured from the blank material 50. In FIG. 4, a dashed lines MR represent the boundaries between the parts that expected to be the overlaps 30 and the areas excluded from the overlaps 30 in the finished lid 10.Other Example 2 of Blank Material for Lid

[0131] The blank material for a lid is not limited to the configuration in FIGS. 2A-2D. As shown in FIGS. 5A and 5B, it may have a plurality of half-cuts 57 that are partially notched in the thickness direction of the blank material 50 instead of the cut lines 54. The parts interposed between adjacent half-cuts 57 is the folding allowances. The half-cuts 57 may be used along with the cut lines 54.Other Example 3 of Blank Material for Lid

[0132] The blank material for the lid is not limited to the configuration in FIG. 2. As shown in FIGS. 49A and 49B, the cut lines 54 are not limited to being linear and may be formed in a curved shape (FIG. 49A). Also, the cut lines 54 are not limited to being formed as lines cut towards the center and may be formed as lines cut in a direction away from the center (FIG. 49B).

[0133] FIGS. 49A and 49B are plan views for explaining one example of Other Example 3 of the blank material for the lid.Method of Producing a Lid

[0134] The lid 10 can be produced, e.g., by shaping the blank material 50 using a lid forming machine or its similarities that have a pair of dies, a male die and a female die, which is an example (not shown). The blank material is placed between the male die and the female die that are separated to interpose the blank material, which is then shaped by clamping the dies. As shown in FIG. 4B, the blank material 50 is folded at the inner end of the second corresponding part 53 (the boundary between the first corresponding part 52 and the second corresponding part 53), and at that time, an overlapping structure (overlap 30) is formed in adjacent folding allowances 51, as shown in FIG. 4C. Conditions such as the width of the overlaps 30 can be determined by adjusting the shape of the dies and the control of the lid forging apparatus. As a result of shaping the blank material 50, the first corresponding part 52 comes into the top surface 11, and the second corresponding part 53 comes into the side wall 13. In FIG. 2A, the folding allowance 51 forming the second corresponding part 53 comes into the small wall 14. The boundary between the first corresponding part 52 and the second corresponding part 53 approximately turn into the bend part 12.

[0135] When the side wall 13 of the lid 10 has a taper as shown in FIG. 1, it is preferable that at least one of the male die and the female die is separable for clamping.

[0136] In order to form the small wall joint parts 15 concurrently with the shaping, the lid forming machine is preferably equipped with a joining mechanism for creating the small wall joint parts 15. Such joining mechanism is exemplifiable to include a heating mechanism configured to perform thermal treatment on at least a part of the overlaps 30, or an ultrasonic welding mechanism configured to apply ultrasonic welding to a part of the overlaps 30. This may be in use of the blank material 50 having a circular, sheet-like coated paper (e.g., configured to have a resin layer laminated onto a paper) and with cut lines 54 as illustrated in FIG. 2A extending inward from an outer peripheral rim of the coated paper. The regions interposed between adjacent cut lines 54 are folding allowances 51. When the folding allowances 51 are tailored into the small walls 14 by the lid forming machine or its similarities, each resin layer is exposed on one side of the opposing surfaces of the adjacent small walls 14 on the overlaps 30. With such joining technique during the shaping the blank material 50, facing surfaces of the small walls 14 on the resin layer are enabled to be joined together at the overlaps 30, thereby forming each small wall joint part 15.1-3 Action and Effects

[0137] In the lid of the present invention, the side wall 13 has a structure in which a plurality of small walls 14 continuous with the top surface 11 are partially overlapped. This allows the top surface 11 and the side wall 13 to be formed by shaping a sheet-like blank material 50.

[0138] Further, adjacent small walls 14 are surface-joined by forming the small wall joint parts 15 at the overlaps 30, and the greater the width WD of each small wall joint part 15 may be, a stronger joining force can be. In the lid of the present invention, the width WD of each small wall joint part 15 is smaller in the vicinity of the bend part 12 (as there are fewer fixed overlaps), allowing the side wall 13 to have a relatively more flexible structure in the vicinity of the bend part 12 than at the position far from the bend part 12. This makes it possible to temporarily deform the shapes of the top surface 11 and the bend part 12, making it easy to fit the lid 10 onto the container 101 even if there are variations in the dimension of the container by temporarily applying a deforming force to the lid 10. Because the width WD of each small wall joint part 15 at positions far from the bend part 12 (positions closer to the lower end) is greater than the width WD at positions near the bend part 12, the shape of the side wall 13 can be stabilized. This makes it easier for a restorative force to serve even though the shapes of the top surface 11 and the bend part 12 are temporarily deformed, enhancing the restorability of the side wall 13′s shape.

[0139] Since the small wall joint parts 15 in the lid of the present invention spreads in the surface direction (peripheral direction) of the side wall 13, it's better than conventional lids with pleated or wrinkled side walls. Even if the force expanding in the surface direction acts on the side wall 13, possibilities of the side wall 13 irreversibly spreading outward can be suppressed. This means that when the lid 10 is attached to a container 101 that is slightly larger in dimension than the inner peripheral surface 13A of the lid's side wall 13, which is less likely to undergo irreversible expansion, even if the force that expands it (force that expands the side wall 13 in the peripheral direction) acts on it. This makes it easier to keep the lid 10 securely attached to the container 101, and also prevents the lid's side wall 13 from unintentionally stretching and compromising the sealing performance of the container with lid 150.

[0140] In conventional lids configured with a fold-like or wrinkle-like side wall, members to form the side wall are contiguous (with few or no cuts) at the portions where wrinkles are created. In the lid of the present invention, adjacent small walls 14 are cut, and side end surfaces of the small walls 14 form side ends of the overlaps 30 on the side wall 13. Supposing that a lid of the present invention with the same cross-sectional diameter as the conventional lids having pleated or wrinkled side walls, total areas of surface contact regions (surface contact regions on the portion where the wrinkles or pleats are formed) where the members forming the side wall of the conventional lid come into surface contact with each other are called as an ARA1, and total areas of overlaps 30 in the lid of the present invention are called as an ARA2. The ARA2 is greater in diameter than ARA1. That is, total area from the small wall joint parts 15 formed in each overlap 30 can be made larger than the joining area when wrinkles or pleats are joined in conventional lids. This also contributes to the lid of the present invention capable of stabilizing the shape of the side wall 13 much better than conventional lids.

[0141] The attachment of the lid 10 to the container 101 is further explained using FIGS. 25A and 25B. FIG. 25A is a cross-sectional view illustrating an example wherein the side wall 13 of the lid 10 is hooked onto the rim 103 of the opening 102 of the container 101. FIG. 25B is a cross-sectional view illustrating an example wherein the opening 102 of the container 101 is closed by the lid 10.

[0142] In attaching the lid 10 to the container 101 is such that the side wall 13 and the top surface 11 of the lid 10 are hooked onto one end of the rim 103 of the container 101 and the lid 10 is deflected to be warped diagonally upward in such a way that the side wall 13 at the end (boundary between the top surface 11 and the side wall 13) formed at a side away from a hooked end ST1 (between the top surface 11 and the side wall 13) of the lid 10 is lifted up. In FIG. 25A, a dashed line shows a undeflected phase as PD1 of the lid 10, and a solid line shows a deflected phase as PD2. While the lid 10 is bent, the end of the lid 10 at an area of a form ST2 is pulled in the direction of an arrow F1 until the lower end 13C of the side wall 13 of the lid 10 is positioned slightly outside of directly above the rim 103 of the container 101 (with the container 101 being slightly deformable). The side wall 13 is subsequently pushed down in the direction of an arrow V1 and the deflection in the lid 10 gradually resolves. The lid 10 undergoes the outward force from the container 101 close to the upper end of the side wall 13 at the hooked end of the lid 10 (at the end ST1). The lid 10 is in closely contact with the container 101 at the end ST1 with the PD2 as the shape retention force of the overlaps 30 of the side wall 13 of the lid makes it easier for the rim 103 of the container 101 to be embraced by the side wall 13, the top surface 11, and the bend part 12. This allows the lower end of the side wall 13 to easily wrap around the underside of the rim 103, as indicated by an arrow F2, enough to enable a stronger adhesion between the lid 10 and the container 101.

[0143] When the lid 10 is in a phase as PD3 as shown in FIG. 25B as it is externally fitted onto the rim 103 of the container 101, which can apply a stress T to the lid 10 in the outward direction. The lid 10 is in overall closely contact with the container 101 as the lid 10 that undergoes stress T from the container 101 due to the shape retention force acting in the overlap 30 of the side wall 13 of the lid 10, the rim 103 of the container 101 is easily embraced by the side wall 13, the top surface 11, and the bend part 12. The lower end of the side wall 13 can also easily wrap around the underside of the rim 103, as indicated by arrows F2 and F3, allowing the lid 10 and the container 101 to strongly adhere. Additionally, while the inward force is easily applied to the top surface 11, as shown by arrows F1a and F1b, the shape retention force in the overlaps 30 of the lid's side wall 13 enhances the effect of suppressing possibilities of the lid 10 detaching from the container 101. This effect is particularly enhanced when the lid 10 is made of a paper-based material, from the perspective of improved shape retention of the side wall 13.1-4 Modified Examples of the LidModified Example 1

[0144] In the lid according to the first embodiment, as shown in FIGS. 3A and 3D, the overlapping structure of adjacent small walls 14 that form the overlaps 30 may differ from the example in FIG. 1 (Modified Example 1). FIGS. 3A and 3D are side views for explaining one example of a lid according to Modified Example 1 of the first embodiment. In FIG. 3A, when the first small wall 14A and the second small wall 14B are defined such that the direction from the first small wall 14A to the second small wall 14B is clockwise, the outer surface 35 of the first small wall 14A and the inner surface 34 of the second small wall 14B face each other. In FIG. 3D, in a plan view of the lid 10 (viewed from +Z to −Z direction), when the first small wall 14A, the second small wall 14B, and the third small wall 14C are defined such that the direction from the first small wall 14A to the second small wall 14B is clockwise, the two side ends 33, 33 of the first small wall 14A and the third small wall 14C are exposed on the inner peripheral surface 13A of the side wall 13. For the second small wall 14B, which is interposed between the first small wall 14A and the third small wall 14C, the two side ends 33, 33 are exposed on the outer peripheral surface 13B side of the side wall 13. In each overlap 30, the outer surface 35 of the first small wall 14A and the inner surface 34 of the second small wall 14B partially face each other, and the outer surface 35 of the third small wall 14C and the inner surface 34 of the second small wall 14B partially face each other.Modified Example 2

[0145] In the lid 10 according to the first embodiment, as shown in FIG. 3B, the proximal end 31 of the small walls 14, which can correspond approximately to the position on the line connecting the innermost ends of the cut lines 54 of the blank material 50, may be located slightly underneath the bend part 12 (Modified Example 2). FIG. 3B is a side view for explaining one example of a lid according to Modified Example 2 of the first embodiment. The side wall 13 includes the small wall 14, and an extension wall part 36 configured to connect the small wall 14 and the top surface 11 (in FIG. 3B, connecting the small wall 14 and the bend part 12) is formed between the small wall 14 and the top surface 11 (between the small wall 14 and the bend part 12 in FIG. 3B). When the blank material 50 is shaped into the lid 10, as shown in FIG. 16, a structure where the innermost ends 63 of the cut lines 54 slightly protrudes outward (an outward protruding part 64) may be formed. FIG. 16 is a plan view showing one example of the blank material 50 being folded at the second corresponding part 53 (folded to the direction −Z). The outward protruding part 64 may remain as it is seen, or may be pressed and crushed by a pair of dies as shown in FIG. 3B, to form a crushed structural part 65 where wrinkles or pleats may be formed. The wrinkles or pleats created in the crushed structural part 65 allows the bend part 12 to slightly deform by stretching (causing deformation that stretches the wrinkles in the region of the bend part 12) when the outward force is applied to the lid 10 in the vicinity of the bend part 12 during attachment of the lid 10 to the container 101, thereby preventing the overall destruction of the lid 10.

[0146] The blank material 50 for the lid 10 according to Modified Example 2 of the first embodiment can be used such that the second corresponding part 53 is comprised of a folding allowance (first folding allowance 60) interposed by the cut lines 54, and a second folding allowance 61 continuously formed inward from the first folding allowance 60, as explained with FIG. 5A. The second folding allowance 61 is formed in an annular shape, and each first folding allowance 60 extends outward from the outer peripheral rim of the second folding allowance 61. When the lid 10 is formed with the blank material 50, the first folding allowance 60 and the second folding allowance 61 form the side wall 13 by the blank material 50 being shaped.Modified Example 3

[0147] In the lid 10 according to the first embodiment, as shown in FIG. 3C, the distance between H1 at the top surface 11 and the lower end of the side wall 13 may be uniformed (Modified Example 3). FIG. 3C is a side view illustrating one example of the lid 10 according to Modified Example 3 of the first embodiment. This improves the design of the lid and allows the lid 10 to be placed stably on a table or desk even when the lower end of the side wall 13 faces downward.Modified Example 4

[0148] In the lid 10 according to the first embodiment, as shown in FIG. 7A, the bend part 12 is not limited to have a shape bent (folded) and may have a curve. FIG. 7A is a cross-sectional view illustrating one example of a lid according to Modified Example 4 of the first embodiment.

[0149] In the lid according to Modified Example 3 of the first embodiment, as shown in FIG. 7B, the part corresponding to each innermost end 63 of the cut line 54 of the blank material 50 (denoted by the same reference numeral 63 in FIG. 7B for simplified explanation) may be located slightly below the bend part 12, as explained in Modified Example 2. FIG. 7B is a cross-sectional view illustrating another example of the lid 10 according to Modified Example 4 of the first embodiment. Further, as shown in FIG. 7C, the part of the innermost end 63 may be located in the region of a boundary DE interposed between the side wall 13 and the top surface 11, which is defined at the center of the bend part 12. The proximal end 31 of the small wall 14 come to be located inside the bend part 12 (and below the boundary between the side wall 13 and the top surface 11).Modified Example 5

[0150] In the lid 10 according to the first embodiment, as shown in FIGS. 9A-9C, it may have a label structure 40 (Modified Example 5). FIGS. 9A-9C are diagrams for explaining one example of the lid 10 according to Modified Example 5 of the first embodiment. According to the lid 10 of Modified Example 5 of the first embodiment that provides the labeling structure 40, when used with a container with lid 150, the contents within the container 101 can be easily identified by an external appearance of the container with lid 150.

[0151] The label structure 40 comprises a label display 41 and a label tag part 42. The label display 41 is provided adjacent to the outer peripheral end 11A of the top surface 11 of the lid 10. In FIG. 9A, any label patterns 44, such as capitals H, C, or any decorative design are arranged on a fan-shaped sheet at a designated position closer to the outer peripheral end of the top surface 11. The label tag part 42 as shown in FIG. 9B, can be formed by providing any label tags 43 that extends from a designated place in the lower end (tip end 32) of the small wall 14. The label tags 43 comprises the label tag part 42 and it is provided at a place in accordance with the label display 41 in a plan view of the lid 10. When the label tags 43 are folded into directing outwards, it comes to be visually identified at the outwards direction over the place related to the label display 41 in a plan view of the lid 10 as shown in FIG. 9C. With the label patterns 44 in which any knowledge are given, the contents within the container 101 can be identifiable from both the label tags 43 as well as the label patterns 44 that tell what is therein from the on-fold label tags 43. FIG. 9C shows, for example, a capital letter H to be deemed as “hot drink” and the letter C as “cold drink”. The label tag 43 for the cold drink placed in the position corresponding to the label patterns 44 reading as the capital letter C is folded to orient outwards, so that it enables readily find the label tag 43 in a plan view of the lid 10, as shown in FIG. 9C. This allows anyone who doesn't know what is stored in the container 101 to identify the cold drink in the container 101 by just looking at the container with lid 150.Modified Example 6

[0152] In the lid 10 according to the first embodiment, as shown in FIGS. 10A and 10B, it may have a gripping structure 45 (Modified Example 6), which are diagrams for explaining one example of the lid 10 according to Modified Example 6 of the first embodiment. According to the lid 10 of Modified Example 6 of the first embodiment, by providing the gripping structure 45, an uncleanness caused to the lid by hand touching the top surface 11 or side wall 13 of the lid 10 can be suppressed as much as possible. The gripping structure 45 can be provided at the lower end of any of small walls 14 as an extended part (extension), similar to the label tag part 42 described above. In FIGS. 10A and 10B, the shape of the extension is semi-circular, but this is just one example.Modified Example 7

[0153] The lid 10 according to the first embodiment is not limited to being formed such that the side wall 13 tapers in a direction away from the bend part 12 (downward in FIGS. 1B, 1C, and the related drawings as −Z direction) (Modified Example 7). The lid 10 according to the first embodiment as shown in FIGS. 12A and 12B, for example, may be formed such that the side wall 13 tapers from a base position P1 to a specified position P2, and a portion presenting from the specified position P2 to downwards (to the lower end 13C of the side wall 13) may be formed to have a flared shape. The base position P1 indicates a location at the bend part 12 (or the end of the bend part to the side of the side wall 13 where the bend part 12 is curved), and the specified position P2 indicates a location that can be defined as a range away from the base position P1 to a specified range (−Z direction).

[0154] In the lid 10 according to Modified Example 7 of the first embodiment, the side wall 13 has a flare part 66 (shape increasingly widened like a trumpet) in the lower of the specified position P2.

[0155] The flare part 66 formation makes it easier to fit the lid 10 onto the container 101.Other Example 1

[0156] The lid 10 according to Modified Example 7 of the first embodiment may be formed such that the side wall 13 hangs perpendicularly relative to the top surface 11 in a direction away from the bend part 12 (−Z direction) as shown in FIG. 6A and the bend part 12 may be configured to have a curve as shown in FIG. 17A. Meanwhile as shown in FIG. 17D, the flare part 66 described above with FIGS. 12A and 12B may be formed.Other Example 2

[0157] The lid 10 according to Modified Example 7 of the first embodiment, as shown in FIG. 6B, may be formed such that the side wall 13 may be a flared shape relative to the top surface 11 in a direction away from the bend part 12 (−Z direction) and the bend part 12 may be configured to have a curve as shown in FIG. 18A. As shown in FIG. 18D, the flare part 66 described above with FIG. 12B may even be formed.Modified Example 8

[0158] In the lid 10 according to the first embodiment, as shown in FIGS. 13A-13E, the top surface 11 may have additional parts processing and configurations (Modified Example 8). FIGS. 13A-13E are plan views for explaining one example of the top surface 11 of the lid 10 according to Modified Example 8 of the first embodiment. As shown in FIGS. 13A-13C, the top surface 11 of the lid 10 may have a hole 16 for air vent, a through-hole 17 for inserting a straw, or a drinking spout forming structure 18 for forming a drinking spout. In FIG. 13A, the hole 16 is formed in a circular shape and is penetrating the surface in the thickness direction of the top surface 11. In FIG. 13B, the through-hole 17 is formed by a cross-shaped cut (the center of the cross is non-cut) in a plan view of the top surface 11, but this is just one example. The cross-shaped cut that forms the through-hole 17 by penetrating the top surface 11 in thickness direction thereof. In FIG. 13C, the drinking spout forming structure 18 is formed by a small opening 18A, a small lid 18B, a base 18D, and a hinge 18C. During the small lid 18B being lifted from the base 18D via the hinge 18C, the small opening 18A is exposed. This exposed small opening 18A is the drinking spout.

[0159] As shown in FIGS. 13D-13E, the top surface 11 may be provided with accessory members such as a tab 19, a non-woven fabric 20, or a backing sheet 21 (Modified Example 8). FIGS. 13D-13E are plan views for illustrating one example of the top surface 11. In FIG. 13D, a tab 19 is provided on the small lid 18B of the lid 10 shown in FIG. 13C. By lifting the tab 19, the small lid 18B can be smoothly pulled up. In FIG. 13E an opening 23 is formed in a specified region of the lid 10 shown in FIG. 13C, and a non-woven fabric 20 is attached so as to cover the opening 23. A backing sheet 21 is provided so as to cover the non-woven fabric 20. The backing sheet 21 is provided with a small hole 22. Granted that the contents within the container 101 in such a configuration generate gas such as carbonation, the gas can be appropriately released from the container 101. Under this situation, the possibility of the contents leaking out together can be suppressed, and possibilities of the lid 10 unintentionally being detached from the container 101 due to an increased gas pressure can be suppressed.

[0160] The top surface 11 of the lid 10 is not limited to be formed in a uniformly flat plane but holes or cuts like the hole 16 or through-hole 17 may be formed thereon, or a tab 19 or non-woven fabric 20 is provided in a certain place thereon.

[0161] Regarding the blank material for the lid (blank material 50), which is described as being sheet-like, it may include holes or cuts like the hole 16 or the through-hole 17 are formed therein, and may include a tab 19, non-woven fabric 20 and others provided in a certain place thereon.Another Example of Modified Example 8

[0162] When a drinking spout forming structure 18 is provided on the top surface 11 as shown in FIGS. 13C-13E, it is preferable that a designated part distinguishable display 70 is provided on the lid 10 in order to suppress getting dirty around a part at the drinking spout (small opening 18A) as shown in FIG. 13F. This display enables distinguishing an area defined as a place closer to the small opening 18A within the outer peripheral end 11A in the top surface 11, the side wall 13, and the bend part 12 (designated part) and another as excluded from the designated area). In FIG. 13F, the designated part distinguishable display 70 is provided to be liner with the designated color along the outer peripheral end 11A of the top surface 11 so as to be an outstanding mark when touching and handling the lid 10 by hand.Modified Example 9

[0163] In the lid 10 according to the first embodiment, a fiber-containing sheet 80 may be placed on the undersurface 11B of the top surface 11 as exemplified in the following First to Third Examples. This is called as Modified Example 9 of the first embodiment. The fiber-containing sheet 80 placed on the undersurface 11B of the top surface 11 may be called as the first fiber-containing sheet. The undersurface 11B in this specification presents the surface of the top surface 11 (i.e., opposing surface) that opposes the opening 102 during the lid 10 being attached to the container 101 that has the opening 102.First Example

[0164] In the lid 10 according to Modified Example 9 of the first embodiment, it is preferable that the fiber-containing sheet 80 is placed on the undersurface 11B of the top surface 11 during a hole 16 for air vent (also shown in FIG. 13A) is formed so as to cover the hole 16 (First Example) as shown in FIGS. 28A and 28B. This is called as First Example of Modified Example 9. FIGS. 28A and 28B are schematic plan and cross-sectional views illustrating one example of the lid 10 according to the First Example of Modified Example 9 of the first embodiment.

[0165] In a plan view of the fiber-containing sheet 80, the lid 10 includes a non-joint part 82 in an area opposing the hole 16 and a certain surrounding area in the fiber containing sheet 80, where no joining is formed against the top surface 11. In FIGS. 28A and 28B, a joint part 81 is formed in accordance with the outer peripheral rim of the fiber-containing sheet 80, where the fiber-containing sheet 80 is joined to the undersurface 11B of the top surface 11. In the plan view of the fiber-containing sheet 80, the non-joint part 82 is formed on the inner side (toward the center CT) of the joint part 81. In the non-joint part 82, the top surface 11 and the fiber-containing sheet 80 may be in contact, or a gap 83 may present between them.

[0166] The blank material 50 for forming the lid 10 according to the first example of the ninth variation of the first embodiment is formed by partially joining the sheet material 55 and the fiber-containing sheet 80 (to be joined portion forming the joint part 81). In the blank material 50, the sheet material 55 and the fiber-containing sheet 80 are not joined in the area opposing to the non-joint part 82.Joint Part

[0167] In FIGS. 28A and 28B, the joint part 81 is formed as a part where the fiber-containing sheet and the top surface 11 are directly joined and it may also be a part where the fiber-containing sheet 80 and the top surface 11 are joined via an adhesive layer or other layers.

[0168] The method of joining the fiber-containing sheet 80 and the top surface 11 (for forming the joint part) is not particularly limited and may adopt techniques for a heat sealing or an ultrasonic welding. The joint part 81 is formed in an annular shape in FIGS. 28A and 28B, but this is just one example, and not limited to this.Fiber-containing Sheet

[0169] As shown in FIGS. 39A-39C, the fiber-containing sheet 80 is a sheet configured to arrange a plurality of fibers 91. FIGS. 39A-39C are enlarged plan views illustrating one example of the fiber-containing sheet 80 and are partial plan views showing the arrangement of the fibers 91 for 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 plurality of fibers 91 may be oriented (FIGS. 39B, 39C) or may be prevented from being oriented (FIG. 39A). When the plurality of fibers 91 are oriented, their orientation may be substantially in a single direction, or substantially in multiple directions (e.g., two directions) as shown in FIG. 39B. When the fibers 91 are oriented in a specific direction, it is not limited to the longitudinal direction as a specific direction but include the longitudinal direction deviated from the specific direction for all fibers 91 that are aligned. The fiber containing sheet 80 may have differences in fiber density (coarseness and fineness of fiber density) when viewed from different positions in the surface direction of the fiber-containing sheet 80. When the fiber-containing sheet 80 has differences in fiber density (coarseness and fineness of fiber density), irregularities may be formed on the surface of the fiber-containing sheet 80 such that a part with high fiber density has a convex and a part with low fiber density has a concave. The fiber-containing sheet 80 may have a plurality of holes 92 as non-fiber existing parts in the surface direction of the fiber-containing sheet 80. In FIG. 39B, the holes 92 are formed in a substantially lattice shape, and parts with low fiber density exist around the holes 92, while parts with high fiber density are formed in a mesh shape, sandwiched between the low-density parts. A raised structure is formed such that it has the convex from the low-density parts towards the high-density parts in the fiber-containing sheet 80 as shown in FIG. 39B. When such irregularities and holes 92 are formed, if liquid is contained in the container 101 during the container with lid 150, even if the liquid moves with power towards the fiber-containing sheet 80, liquid droplets can be broken up, and their force can be efficiently reduced.Water Repellency and Air Permeability

[0170] It is preferable that the fiber-containing sheet 80 has water repellency. The water repellency of the fiber-containing sheet 80 can be achieved by using fibers 91, for example, that possess water repellency as described later. The fiber-containing sheet 80 may also have air permeability, which 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 configuration of both the fibers 91 and the non-fibers is such that the air permeability of the composite sheet is not completely blocked. Specifically, as shown in FIGS. 39A and 39B, the air permeability is configured not to be blocked at positions facing the hole 16 and the through-hole 17 formed in the top surface 11, and in their adjacent opposing regions.Fibers

[0171] The material of the fibers 91 contained in the fiber-containing sheet 80 can include resins such as synthetic resins and natural resins, pulp, wood, bamboo, and metals, but it preferably possesses water repellency. Where a water-absorbent material (e.g., pulp) is used as the material for the fibers in the fiber-containing sheet 80, the fibers 91 undergo a water-repellent treatment. The water-repellent treatment of fibers can be performed by coating the fibers with resin, or attaching water-repellent materials such as wax to the surface and / or interior of the fibers.

[0172] As the fiber-containing sheet 80, a material composed solely of fibers 91 (a fiber sheet) or a material composed of fibers 91 and non-fibers (composite sheet) can be used. As a composite sheet, a structure in which a layer composed of a fiber sheet and a resin layer are laminated can be exemplified. The fiber-containing sheet 80 includes non-woven fabric, paper, spunlace, spunbond, thermal bond, and the like. Mesh-like fiber sheets include sheets made of regenerated fibers using wood pulp (e.g., lyocell, Tencel® and the like.) and spunlace.

[0173] Regenerated fibers may also include rayon and the like. The fiber-containing sheet 80 is preferably a fiber sheet composed of fibers having water repellency and / or waterproofness in view of water repellency and easily handling as well as suppressing leakage of liquid out of the container 101. As fibers having water repellency and / or waterproofness, e.g., those treated with a coating process on fibers such as regenerated fibers (rayon and the like) may be used. Coating processes include spraying coating agents onto the fibers, or immersing the fibers in a liquid containing the coating agents which include resins and waxes. Resins for coating agents include natural resins such as rosin, fluororesins, acrylic resins, and silicone resins.

[0174] The explanations regarding the fiber-containing sheet and fibers provided in the First Example are also applicable to the Second and Third Examples as described later. The details of the fiber containing sheet and fibers will be omitted for the Second and Third Examples.Second Example

[0175] In the lid 10 according to Modified Example 9 of the first embodiment, if a through-hole 17 for forming a straw insertion opening is provided, it is preferable that a fiber-containing sheet 80 is placed on the undersurface 11B of the top surface 11 so as to cover the through-hole 17, as shown in FIGS. 29A and 29B (Second Example), which are schematic plan and cross-sectional views illustrating the lid 10 according to the Second Example of Modified Example 9 of the first embodiment. In a plan view of the lid 10, the fiber-containing sheet 80 is formed so as not to join with the top surface 11 in the region of the fiber-containing sheet 80 that opposes the through-hole 17 and its surrounding designated area, instead, provided with non-joint part 82. In FIGS. 29A and 29B, a joint part 81 is formed outside the non-joint part 82 of the fiber-containing sheet 80, where the fiber-containing sheet and the undersurface 11B of the top surface 11 are joined. As explained in the First Example of Modified Example 9, in the non-joint part 82, the top surface 11 and the fiber-containing sheet 80 may be in contact, or a gap 83 may present between the top surface 11 and the fiber-containing sheet 80.

[0176] In the Second Example, it is preferable that a through-hole 90 for forming a straw insertion opening is also formed in the fiber-containing sheet 80. The through-hole 17 formed in the top surface 11 is called as the first through-hole, and the through-hole 90 formed in the fiber-containing sheet 80 is called as the second through-hole. The first through-hole and the second through-hole are arranged so as not to overlap each other, enough to have a long object such as a straw inserted from the first through-hole (through-hole 17) of the lid 10 passing from the first through-hole to the second through-hole (through-hole 90).

[0177] Specifically, in FIG. 29A, both the first through-hole and the second through-hole are formed in a roughly cross shape with the center CT being a non-perforated, and they are arranged such that the second through-hole overlaps the first through-hole when the first through-hole is rotated 45 degrees clockwise. FIG. 29A merely illustrates an example and does not limit the first and second through-holes formation in the Second Example.Third Example

[0178] In the lid 10 according to Modified Example 9 of the first embodiment where a drinking spout forming structure 18 is formed in addition to the examples described above, it is preferable that the fiber-containing sheet 80 is placed on the undersurface 11B of the top surface 11 while avoiding the small lid 18B of the drinking spout forming structure 18 as shown in FIGS. 30A and 30B (Third Example), which are schematic plan views illustrating one example of the lid 10 according to the Third Example of Modified Example 9 of the embodiment, and show that a tab 19 is provided on the small lid 18B of the lid 10. By arranging the fiber-containing sheet 80 to avoid the small lid 18B, even if the small lid 18B is pulled up around the hinge 18C as an axis (the small lid 18B is pulled up along with the pulling of the tab 19 in FIG. 30B), it is less likely that fragments of the fibers 91 of the fiber-containing sheet 80 will be positioned closer to the small opening 18A. This suppresses user discomfort that might arise by the fibers 91 in contact with the user's mouth when they put their mouth to the small opening 18A.Modified Example 10

[0179] In the lid 10 according to the first embodiment as shown in FIGS. 31A-31B, the fiber-containing sheet 80 may be arranged so as to connect adjacent small walls 14 on the inner peripheral surface 13A of the side wall 13, which is called as Modified Example 10 of the first embodiment. The fiber containing sheet 80 connecting adjacent small walls 14 on the inner peripheral surface 13A of the side wall 13 may called as the second fiber-containing sheet.

[0180] FIGS. 31A and 31B are schematic side and cross-sectional views, respectively, illustrating a part of one example of the lid 10 according to Modified Example 10 of the first embodiment. FIG. 31B is a schematic cross-sectional view showing the P-P line vertical section of FIG. 31A. In Modified Example 10, as the fiber-containing sheet 80 is similar to that in Modified Example 9 above, the details are omitted.

[0181] In FIG. 31A, the fiber-containing sheet 80 is arranged so as to connect two adjacent small walls 14 and is positioned to overlap at least a part of the overlaps 30. The fiber-containing sheet 80 is joined to both adjacent small walls 14. The fiber-containing sheet 80 is arranged here such that a partial region of each small wall 14, from first side ends 33A to the second side ends 33B, is exposed on the inner peripheral surface 13A of the side wall 13. The overlaps and wrinkles of the fiber-containing sheet 80 would be less likely to occur, and the possibilities of excessive irregularities of the fiber-containing sheet 80 on the inner peripheral surface 13A of the side wall 13 can be suppressed.Example of Fiber-containing Sheet Shape

[0182] The shape of the fiber-containing sheet 80 is not particularly limited, but as shown in FIGS. 32A and 32B, it is preferably shaped like a gear when attached to the sheet material 55 forming the sheet-like blank material 50 (i.e., in the lid 10 unfolded). The fiber-containing sheet 80 shown in FIG. 32A has an annular part 84 and a plurality of projecting pieces 85 extending outward from the outer peripheral rim of the annular part 84 and arranged along the outer peripheral rim. The projecting pieces 85 are formed at positions corresponding to the cut lines 54, as shown in FIG. 32B, when the fiber-containing sheet 80 is placed on the sheet material 55. FIG. 32A is a plan view illustrating one example of the fiber-containing sheet 80 when it is attached to the sheet material 55. FIG. 32B is a plan view (bottom view of the blank material 50) showing the fiber-containing sheet 80 attached to the sheet material 55. As shown in FIG. 32B, the concept of blank material 50 also includes a structure in which a fiber-containing sheet is attached to the sheet material 55.

[0183] When the fiber-containing sheet 80 is shaped like a gear, even if there are multiple adjacent small walls 14, just a single sheet can cover these adjacent small walls, as shown in FIG. 33.

[0184] This also serves to prevent the fiber-containing sheet 80 from overlapping when the lid 10 is formed.

[0185] In the blank material 50 shown in FIG. 32B, a joint part 86 is formed where the sheet material 55 and the fiber-containing sheet 80 are joined, specifically inward from the boundary between the side wall 13 and the top surface 11 when the lid 10 is formed. It is preferable that the sheet material 55 and the fiber-containing sheet 80 are not joined in the portion outside the joint part 86 (towards the outer end of the blank material 50). This means that in the blank material 50 for forming the lid 10 of Modified Example 10 of the first embodiment, the sheet material 55 and the fiber-containing sheet 80 are partially joined, with no joining in the corresponding outer portion. This allows the formation of the overlaps 30 by overlapping portions of adjacent folding allowances 51 formed in the sheet material 55 when the lid 10 is shaped. Subsequently, the folding allowances 51 and the fiber-containing sheet 80 (projecting pieces 85) can be joined while the overlaps 30 is formed, creating a structure where adjacent small walls 14 are connected by the fiber-containing sheet 80. The joint part 86 is shaped in annular in FIG. 32B, but this is merely an example and the joint part 86 is not limited to this.Lid Production

[0186] To ensure producing the lid 10 as shown in FIG. 33, e.g., the blank material 50 shown in FIG. 32B is processed to be bent so as to be in line with the shape of the lid 10, and thereafter the folding allowances 51 are joined with the fiber-containing sheet 80 (projecting pieces 85) to finally produce the lid 10.Function and Effect

[0187] The lid 10 by Modified Example 10 of the first embodiment allows for greater stability in the shape of the side wall 13. In the first embodiment, the small wall joint parts 15 formed in the overlapping portions (overlaps 30) of adjacent small walls 14, suppresses the destruction of these overlaps, resulting in stabilizing the shape of the side wall 13. Even if the outward force is applied to the small wall joint parts 15, the possibilities of structural damage to the side wall 13 can be reduced.Modified Example 11

[0188] In the lid 10 according to the first embodiment, the two side ends 33 that define the outline of the overlaps 30 may be configured to be positioned in such a way that distortions are formed in the direction from the edge 38 towards the base 37 between the certain range from the vicinity of the base 37 to the base 37. This arrangement also forms a folded-back structural part 39 at the position of the base 37 (Modified Example 11), as shown in FIGS. 43A-43C and related drawings. FIG. 43A is a perspective view illustrating one example of the lid 10 according to Modified Example 11 of the first embodiment. FIG. 42A is also a perspective view illustrating the overlaps of the small wall 14. FIG. 42B is a schematic plan view showing FIG. 42A viewed with the inward / outward direction as the line of sight. FIG. 42C is a schematic cross-sectional view showing the A1-A1 line vertical section of FIG. 42B.

[0189] In FIG. 43A, the side end surface that forms the first side ends 33A have distortions formed in the direction from the edge 38 towards the base 37 so that it is directed towards the inner surface 34 of the first small wall 14A, and further forms a first folded-back part 39A.

[0190] Similarly, the side end surface that forms the second side end 33B has distortions formed in the direction from the edge 38 towards the base 37 so that it is directed towards the outer surface 35 of the second small wall 14B, and further forms a second folded-back part 39B. At the position of the base 37, the first folded-back part 39A and the second folded-back part 39B connect, forming the folded-back structural part 39. As shown in FIG. 43A similar to FIGS. 43B and 43C, within both the first folded-back part 39A and the second folded-back part 39B, the inner surface 34 of the first small wall 14A faces inward / outward, and the outer surface 35 of the second small wall 14B faces inward / outward. In FIGS. 42A-43C, the overlaps 30 includes the base 37 of the side end 33.

[0191] As shown in FIGS. 42A-42B, the two side ends 33 that form the outline of region that come into the overlaps 30 are positioned in such a way that the distortions are formed in the direction from the edge 38 towards the base 37 between a certain range from the vicinity of the base 37 to the base 37. In FIG. 42A, the side end surface that forms the first side ends 33A has distortions formed in the direction from the edge 38 towards the base 37. The side end surface that forms the second side end 33B has distortions formed in the direction from the edge 38 towards the base 37. As shown in 42A with FIGS. 42B and 42C, a face-to-face formation within the inner surface 34 of the small wall 14 and the face-to-face formation within the outer surface 35 of the small wall 14 is prevented at the position of the base 37. In FIGS. 42A-43C, the overlaps 30 includes the base 37 of the side end 33.

[0192] In Modification 11 of the First Embodiment, a folding structure 39 is formed in the overlap 30 at the base 37, and the overlap 30 also includes a portion slightly above the base 37 (portion slightly above the small wall 14, i.e., the portion closer to the top surface 11). According to Modification 11 of the First Embodiment, the overlaps 30 is formed such that there are no gaps between adjacent overall small walls 14 from the lower end side of the side wall 13 to the end closest to the top surface 11. In FIGS. 43A-43C, the folding structure 39 is formed in a Z-shape, but this is just an example; the folding structure 39 may be formed in a continuously Z-folded shape (formed in a zigzag shape). Alternatively, the folding structure 39 may be partially formed in a zigzag shape and partially formed in a Z-shape.

[0193] According to the lid 10 in Modification 11 of the First Embodiment, the overlaps 30 forms the folding structure 39 closer to the base 37, which strengthens the stiffness of the overlaps 30 closer to the base 37. This makes it possible to readily stabilize the structure of the overlaps 30 even if its width is reduced in the region of the base 37.

[0194] The lid 10 according to Modification 11 of the First Embodiment can be produced as shown in FIGS. 45A and 45B. That is, when bending the folding allowance 51 of the blank material 50 to form the small wall 14, the lid 10 can be produced by bending at least a part of the folding allowance 51 at a position separated from the base 37 (innermost end 63 of the cut line 54) (position separated from the cut line 54), which is called as a bending axis BM. FIGS. 45A and 45B are diagrams for explaining the bending position of the folding allowance 51 of the blank material 50 for producing the lid 10 according to Modification 11 of the First Embodiment. For simplified explanation, FIGS. 45A and 45B show only two folding allowances 51 of the circular sheet material 55, and others are omitted. This also applies to FIG. 45C.Modification 12

[0195] In the lid 10 according to the First Embodiment, the two side ends 33 that define and form the outline of the region that come into the overlaps 30 may be positionally related to so as to be gradually shifted relative to each other in the inner-outer direction from the base 37 towards the edge 38 within a certain range from the vicinity of the base 37 to the base 37 (Modification 12 ). FIG. 44A is a perspective view for explaining an example of the lid 10 according to Modification 12 of the First Embodiment. FIG. 44A is also a perspective view for explaining the overlaps of the small wall 14. FIG. 44B is a schematic plan view showing FIG. 44A viewed with the inner-outer direction as the line of sight. FIG. 44C is a schematic cross-sectional view showing the cross-section along line A3-A3 in FIG. 44B.

[0196] In Modification 12 of the First Embodiment, the two side ends 33 are preferably arranged to avoid creating distortions within the side ends 33. According to Modification 12 of the First Embodiment, the side ends 33 can be joined with facing each other at the position of the base 37 of the side end 33 (with face-to-face positioning between the surface of the side end face of the first side ends 33A and the surface of the side end of the second side end 33B), resulting in making it easier to ensure flexibility at the position of the base 37 of the side end 33 compared to when the overlaps 30 includes the bases 37 of the side end 33.

[0197] FIG. 48A can be shown as an example of the lid 10 having the configuration described in Modification 12 of the First Embodiment. FIG. 48A is a cross-sectional view showing the lid 10 according to Modification 12 of the First Embodiment, by which it becomes easier to keep a thickness of the bend part 12 and its region relatively thin, thereby making it easier to maintain the flexibility of the part that contacts the rim 103 of the container 101. This also applies to the Second to Seventh Embodiments. FIG. 48B is a cross-sectional view illustrating the lid having the configuration explained in the Modified Example 12 of the first embodiment according to the Seventh Embodiment as described later. According to the lid 10, it also becomes easier to keep the bend part 12 and its surroundings as relatively thin, thereby making it easier to maintain the flexibility of the part that contacts the rim 103 of the container 101.

[0198] The lid 10 according to Modification 12 of the First Embodiment where the folding allowances 51 of the blank material 50 is bent to form the small walls 14 can be made by bending at least a part of the folding allowances 51 at the position that come into the bases 37 (innermost end 63 of the cut line 54) or a place closer to the innermost end 63 than the tip end as a bending axis BM. FIG. 45C is a diagram for explaining the bending position of the folding allowances 51 of the blank material 50 for producing the lid 10 according to Modification 12 of the First Embodiment.Modification 13

[0199] In the lid 10 according to the First Embodiment, an inward fold 68 that extends in the peripheral direction (extends horizontally) of a part of the side wall 13 may be formed in a place on the upper end of the overlaps 30, within a place from the surroundings of the base 37 of the two side ends 33 to the base 37 (Modification 13 ). FIG. 46A is a perspective view for explaining the lid 10 according to Modification 13 of the First Embodiment. FIG. 46A is also a perspective view for explaining the overlap of the small wall 14. FIG. 46B is a schematic plan view showing a view of FIG. 46A with the inner-outer direction as the line of sight. FIG. 46C is a schematic cross-sectional view showing the cross-section along line A4-A4 in FIG. 46B.

[0200] In Modification 13 of the First Embodiment, parts in which distortions would less likely be occurred in the side end 33. As shown in FIG. 46B, the base 37 can be positioned substantially at the end of the inward fold 68. As shown in FIG. 46C, since the base 37 contacts the small wall 14 (second small wall 14B in FIG. 46C) on the inner peripheral surface 13A of the side wall 13, gaps or unevenness would less likely to form on the inner peripheral surface 13A in the surroundings of the base 37. This can suppress possibilities of the contents stored in the container 101 leaking out from the position of the base 37 when the lid 10 is attached to the container 101. Also, according to Modification 12 of the First Embodiment, it makes it easier to ensure flexibility at the position of the base 37 of the side end 33.

[0201] The lid 10 according to Modification 12 of the First Embodiment can be realized by specifying the bending axis along which one of the adjacent folding allowances 51 is bent to form the small wall 14 by bending the folding allowance 51 of the blank material 50 as shown in FIG. 47. That is, when the clockwise direction of time movement as a forward direction (arrow AR1) among the adjacent folding allowances 51, the bending axis of a forward folding allowance 51 is defined as a bending axis BM1, and the bending axis of a rearward folding allowance 51 is defined as a bending axis BM2. Both bending axes BM1 and BM2 extend clockwise so as not to intersect the cut lines 54 in the forward direction. Bending axes BM1 and BM2 extend rearwardly clockwise (in the direction of the arrow AR2) so as to intersect the cut lines 54 at or near the position that come into the base 37 (innermost ends 63 of the cut lines 54). Specifically, the bending axis BM2 in the clockwise-forward direction (in the direction of the arrow AR1) intersects the bending axis BM1 and does not intersect the cut lines 54, meanwhile, it intersects the innermost ends 63 of the cut lines 54 in the rearward clockwise (in the direction of the arrow AR2).

[0202] The lid 10 is produceable by defining such bending axes BM1 and BM2, and bending the folding allowance 51 in the order of bending axes BM1 and BM2 to form the inward fold 68 as well as the small wall 14. FIG. 47 is a diagram for explaining the bending position of the folding allowance 51 of the blank material 50 for producing the lid 10 according to Modification 13 of the First Embodiment.2. Second Embodiment

[0203] The lid 10 according to the Second Embodiment has the same configuration as the First Embodiment, except for a protrusion 25 projecting inward (direction toward a center CT) being formed at the side wall 13 as shown in FIGS. 11A-11C, which are diagrams for explaining the lid 10 according to the Second Embodiment. In the lid 10 according to the Second Embodiment, as the configurations of the top surface 11, side wall 13, and small wall 14 and similar ones are the same as those in the First Embodiment, except for the protrusion 25, the same explanations as the First Embodiment are omitted.Protrusion

[0204] In the lid 10, as shown in FIGS. 11A-11C, a protrusion 25 projecting inward (in the direction of the center CT, i.e., from the outer peripheral surface 13B to the inner peripheral surface 13A of the side wall 13) is formed at a certain place on the side wall 13. It is preferable that the protrusion 25 is a ridge part formed in a stripe shape to encircle the inner peripheral surface 13A of the side wall 13.

[0205] In the lid 10 according to the Second Embodiment as shown in FIGS. 11A-11C, a convex structure of the protrusion 25 is formed on the inner peripheral surface of the side wall 13, and a recess 24 may be formed at a corresponding position on the outer peripheral surface 13B of the side wall 13 where the convex structure is formed. With such a structure, the shape of the side wall 13 can be further stabilized.

[0206] Although FIGS. 11A-11C illustrate that the side wall 13 has a taper as going downwards, the shape of the side wall 13 is not limited to this. The lid 10 according to the Second Embodiment may be formed such that the side wall 13 hangs down perpendicularly to the top surface 11 in a direction away from the bend part 12 as shown in FIG. 17C. As shown in FIG. 18C, the side wall 13 may be formed to have a thickness relative to the top surface 11 in a direction away from the bend part 12. FIGS. 17C and 18C are cross-sectional views for explaining the other example of the lid 10 according to the Second Embodiment.3. Third Embodiment3-1. Configuration of the Lid

[0207] The lid 10 according to the Third Embodiment has the same configuration as the First Embodiment, except that the bend part 12 is comprised of an overhang 26, as shown in FIGS. 8A-8C, which are diagrams for explaining the lid 10 according to the Third Embodiment. As the lid 10 according to the Third Embodiment comprised of the top surface, side wall, and small wall and similar ones are the same as those in the First Embodiment except for the overhang 26, details same as the First Embodiment are omitted.Overhang

[0208] In the lid 10, as shown in FIGS. 8A-8C, a structure (overhanging structure) is formed where a region SR1 on the outer peripheral end 11A side of the top surface 11 from the center CT projects upward. The part projecting upward from this region SR1 is an overhang 26. The bend part 12 is defined as being formed by the overhang 26. The center of the bend part 12 is defined as a position between a position U1 where it begins to bend outward from the center CT and a position U2 that is an outer end of the overhang 26. This inter position is defined as the boundary DE between the top surface 11 and the side wall 13. In FIGS. 8A-8C, the boundary DE is defined approximately at the upper end of the overhang 26. The inside from the upper end of the overhang 26 is the top surface 11, and the outside from the upper end of the overhang 26 is the side wall 13.

[0209] The overhang 26 is configured to have a dimension such that the recessed part 27 as described later can be formed enough to cover the rim 103 of the container 101.Recessed Part

[0210] In the Third Embodiment, the inner surface 26A of the overhang 26 is a recessed part (recessed part 27). The recess part 27 has a shape that fits the shape of the overhang 26 and is formed depending on the shape of the press die being used when the lid 10 is formed using the blank material 50.Size of the Recessed Part

[0211] The recessed part 27 has preferably a dimension to enable the rim 103 of the container 101 fittable thereto. When the lid 10 having such recessed part 27 is used as a combination of container with lid 150, the rim 103 approximately fits into the recessed part 27 as described later as shown in FIG. 20. This allows the outer end of the rim 103 (outer peripheral surface 111 of the rim 103 in FIG. 20) to make surface contact with the recessed part 27, making it easy to securely attach the lid 10 to the rim 103 of the container 101.Small Wall

[0212] The proximal end 31 of the small wall 14 may be located at any of the position U2 of the outer end of the overhang 26, slightly lower than the position U2, or upper than the position U2 but lower than the position DE.

[0213] FIGS. 8A-8C illustrate examples that the side walls 13 are configured to have downward tapers, which are not limited to these shapes. The lid 10 according to the Second Embodiment may be formed such that the side wall 13 hangs down perpendicularly to the top surface 11 in a direction away from the bend part 12 as shown in FIG. 17B. Further, as shown in FIG. 18B, the side wall 13 may be formed to be wider relative to the top surface 11 as extending in a direction away from the bend part 12. FIGS. 17B and 18B are cross-sectional views for explaining other examples of the lid 10 according to the Third Embodiment.3-3. Action and Effects

[0214] According to the lid of the Third Embodiment, the same effects as in the First Embodiment can be obtained. Further, the overhang 26 and the recessed part 27 in the lid of the Third Embodiment are formed at the position of the bend part 12, and the recessed part 27 has dimensions enough to receive the rim 103 of the container 101 and to make surface contact with the outer end of the rim 103. Thus, the flexibility of the side wall 13 closer to the bend part 12 (at where the overhang 26 is formed) can be further increased, and the flexibility between the position close to the bend part 12 and that far from the bend part 12 in the side wall 13 can be increasingly differentiate. This allows for stronger contact between the lid 10 and the rim 103 of the container 101, especially its outer peripheral surface, and also allows the side wall 13 of the lid 10 to perform locking more strongly against the rim 103 of the container 101.

[0215] The attachment of the lid 10 to the container 101 will be further explained in FIGS. 26A and 26B. FIG. 26A is a cross-sectional view for explaining the side wall 13 of the lid 10 being hooked onto the rim 103 of the opening 102 of the container 101. FIG. 26B is a cross-sectional view for explaining the opening 102 of the container 101 in closing with the lid 10.

[0216] In attaching the lid 10 to the container 101, the recessed part 27 of the lid 10 is hooked (fitted) onto one end of the rim 103 of the container 101. In FIG. 26A, which shows a hooked end ST1 in the lid, the end is located at the boundary between the top surface 11 and the side wall 13 while a ST2 is the end furthest away from ST1, which is the boundary between the top surface 11 and the side wall 13, the lid 10 is moved to be loosen with upward diagonal distortion as the side wall 13 is lifted up at ST2, for example. FIG. 26A shows where the lid 10 is loosen to bent. During the lid 10 being moved for a bend, the one side end of the lid 10 is managed to be pulled in the direction to arrow F1 up to the inner peripheral surface of the side wall 13 of the lid 10 getting closer to an overhead position of the rim 103 of the container 101 (preferably slightly outer than the overhead of the rim 103). (The rim 103 of the container 101 here may be slightly inwardly deformed). The side wall 13 is then pushed down in the direction of arrow V1. The bending of the lid 10 gradually resolves here, and the outer peripheral surface 111 of the rim 103 is hooked (fitted) into the recessed part 27 of the lid 10.

[0217] When the lid 10 is externally fitted to the rim 103 of the container 101 as shown in FIG. 26B, the rim 103 can apply stress T to the lid 10 in the outward direction. Although the lid 10 undergoes stress T from the container 101, the lower end of the side wall 13 readily wraps around the lower of the rim 103 under the shape-retaining force of the overlaps 30 in the side wall 13 of the lid 10 as indicated by arrows F2 and F3. This makes it easier for the rim 103 of the container 101 to wrap around the side wall 13 the top surface 11, and the bend part 12, and the lid 10 and the container 101 are more firmly contacted together. While the lid 10 according to the Third Embodiment attached to the container 101, the recessed part 27 easily makes surface contact with the outer peripheral surface 111 of the rim 103, a gap 114 creates between the recessed part 27 and the rim 103 on the inside from the upper end 112 of the rim 103 (inner peripheral surface 113). In the Third Embodiment, further when the overhang 26 is extended, own restorative force further improves the contactness between the lid 10 and the outer peripheral surface of the rim 103 of the container 101. In the top surface 11, the force is easily applied inward as indicated by arrows Fla and F1b, which also facilitates to form the gap 114. However, due to the shape-retaining force of the overlap 30 of the side wall 13 of the lid 10, the effect of suppressing detaching the lid 10 from the container 101 is enhanced, and the contactness between the lid 10 and the outer peripheral surface of the rim 103 of the container 101 is also improved. When the lid 10 is formed from a paper-based material, this effect is particularly enhanced from considering from the shape retention of the side wall 13 being especially improved. FIG. 28B includes an enlarged partial view of the section enclosed by the dashed-dotted line in conjunction with the cross-sectional view of the lid 10. In the enlarged partial view, the thin dashed-dotted line MC indicates a straight line that passes through the upper end 112 and extends in the vertical direction.

[0218] In the light of ensuring the same as the lid 10 attached to the container 101 as described here, the top surface 11 is preferably located at the same position as or lower than the upper end of the overhang 26, as shown in FIG. 26B and the related drawings.3-2. Modifications of the LidModification 1

[0219] In the lid 10 according to the Third Embodiment, the protruding direction (overhanging direction) of the overhang 26 was upward (in the +Z direction) from the top surface 11 in FIG. 8A. However, as shown in FIGS. 14A-14C, it may be in a direction outward (away from the center CT) from the top surface 11 for a region SR2 on the upper end side of the side wall 13 (Modification 1). FIGS. 14A-14C are diagrams for explaining the lid according to Modification 1 of the Third Embodiment. The part horizontally protruding from region SR2 as described is the overhang 26. The bend part 12 is defined as being formed by the overhang 26. The center of the bend part 12 is defined as a position between a position U1 where it begins to bend downward and a position U2, the lower end of the overhang 26. This position is defined as the boundary DE between the top surface 11 and the side wall 13. In FIGS. 8A-8C, the boundary DE is defined approximately at the outer end of the overhang 26. In this case, the part above the outer end of the overhang 26 constitutes the top surface 11, and the part below the outer end of the overhang 26 constitutes the side wall 13. The inner surface 26A of the overhang 26 is a recessed part (recessed part 27).Modification 2

[0220] While the overhang 26 is configured to have upward protrusion on the top surface 11 in FIG. 8A, it may be also a part where the region SR1 on the outer peripheral end 11A of the top surface 11 is allowed to protrudes upward as well as the region SR2 on the upper end of the side wall 13 is allowed to protrudes in the outward direction from the center CT (an outwardly swelling structure) as shown in FIGS. 15A and 15B (Modification 2), which are diagrams for explaining the lid according to Modification 2 of the Third Embodiment. The part that protrudes upward from the region SR1 and also protrudes outward from the region SR2 (part that forms an outwardly swelling structure) is the overhang 26. In FIGS. 15A and 15B, as described above, the bend part 12 is defined to be formed at overhang. The center of the bend part 12 is defined as an intermediate position along the overhang 26, between position U1 where it begins to bend upward at a position close to the center CT in region SR1 and the position U2, the lower end of the overhang 26 in the region SR2. This position is defined as the boundary DE between the top surface 11 and the side wall 13. The part from the designated position DE on the overhang 26 towards the center CT comprises the top surface 11, and the part below the designated position DE on the overhang 26 constitutes the side wall 13. The inner surface 26A side of the overhang 26 is a recessed part (recessed part 27).Modification 3

[0221] In the lid 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 (Modification 3). FIG. 24 is a plan view for explaining an example of Modification 3 of the Third Embodiment. In the example of FIG. 24, as explained using FIG. 13 in Modification 8 of the First Embodiment, the drinking spout forming structure 18 is formed by 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 comes to be the drinking spout. In this case, as shown in FIG. 24, it is preferable that the small opening 18A (drinking spout) is formed inward from the inner end of the overhang 26. The overhang 26 can suppress liquid ingested from the small opening 18A (drinking spout) from spilling to the outside of the lid 10. Further, since the outer surface of the overhang 26 near the outer peripheral end 11A of the top surface 11 is a gently sloped surface, contents that tend to spill outward from the upper surface of the top surface 11 can be returned from the sloped surface back towards the drinking spout (small opening 18A), thereby reducing possibilities of the periphery and surroundings of the upper surface (exposed surface) of the lid 10 getting dirty due to spilled contents.4. Fourth Embodiment4-1. Configuration of the Lid

[0222] The lid 10 according to the Fourth Embodiment has the same configuration as the Third Embodiment, except the bend part 12 comprising an overhang 26, and a protrusion 25 formed at or near the end of the overhang 26 closer to the side wall (outer end part) as shown in FIGS. 21A-21C, which are diagrams for explaining an example of the lid 10 according to the Fourth Embodiment. In the lid 10 according to the Third Embodiment, as the top surface, side wall, and small wall and the related one are the same as those in the First Embodiment except the overhang 26 and the protrusion 25 being both configured, details similar to the First Embodiment are omitted. The overhang 26 may be the same as in the Third Embodiment, details are omitted.Protrusion

[0223] As mentioned above, the protrusion 25 is formed at or near an end 28 of the overhang 26 that is closer to the side wall 13, as shown in FIGS. 21A-21C. This is similar to what is shown in the Second Embodiment. FIGS. 21A-21C show that the protrusion 25 is formed to contact with an end 28A (outer end) of the overhang 26 on the side wall 13 of the lid 10 according to Modification 2 of the Third Embodiment. The reference numeral 28B indicates an end of the overhang 26 in the side on the top surface 11. As shown in FIG. 21A, the protrusion 25 is continuously annularly formed along the outer peripheral surface of the lid 10, but this does not prevent it from being formed partially. In view of further making the lid 10 fit more tightly onto the container 101, the protrusion 25 is preferably continuously formed in an annular shape on the outer peripheral surface of the side wall 13.

[0224] The degree of inward protrusion (size) of the protrusion 25 is preferably such that it can face the undersurface of the rim 103 of the container 101 when the lid 10 is attached to the container 101. Further, the protrusion 25 may be sized such that it can contact the outer peripheral surface of the side wall 104 of the container body 110 of the container 101 when the lid 10 is attached to the container 101.

[0225] In FIGS. 21A-21C, the shape of the side wall 13 lower than the protrusion 25 (on the −Z direction in FIGS. 21B and 21C) is formed such that its cross-sectional diameter (cross-sectional diameter of the horizontal section) is getting smaller as extending downwards (a tapered shape). This is just an example of the shape in the lower part of the side wall 13 under the protrusion 25 may be such that its cross-sectional diameter (cross-sectional diameter of the horizontal section) is constant as downwards (hanging and non-tapered shapes) as shown in FIG. 50A. Also, as shown in FIG. 50B, the lower part of the side wall 13 under the protrusion 25 may shape such that its cross-sectional diameter (cross-sectional diameter of the horizontal section) is getting larger as extending downwards (flared shape). In view of making the lid 10 more closely surface-contact the container 101, the side wall 13 under the protrusion 25 is preferably tapered.

[0226] The attachment of the lid 10 to the container 101 will be further explained using FIG. 27, which is a cross-sectional view for explaining an example where the opening 102 of the container 101 is closed by the lid 10. The lid 10 according to the Fourth Embodiment can be attached to the rim 103 of the container 101 in the same manner as explained in the Third Embodiment with FIGS. 26A and 26B. Meanwhile, in the Fourth Embodiment as shown in FIG. 27, the inner surface of the protrusion 25 faces and surface-contacts the undersurface of the rim 103. On the inside from the upper end of the rim 103 (on the side of the opening 102), the lid 10 and the rim 103 are substantially separated. This is considered to be owing to a tensile force acts inward on the top surface 11 due to the shape stability effect (less stretchable effect) of the overlaps 30 of the side wall 13 when the lid 10 is attached to the container 101. Further, due to the shape stability of the overlapping portion 30 of the side wall 13, the portion in surface contact where the outer surface 111 of the rim 103 is surrounded by the inner surface of the protrusion 26 (recess 27) and the protrusion 25 can be stably formed.4-2. Modifications of the Lid

[0227] In the lid 10 according to the Fourth Embodiment, as shown in FIG. 51A, the part of the side wall 13 under the protrusion 25 may form a flare part 66 as explained in Modification 7 of the First Embodiment (Modification of the Fourth Embodiment).

[0228] In FIG. 51A, the entire part of the side wall 13 below the protrusion 25 forms a flare part 66 as explained in Modification 7 of the First Embodiment. However, in the lid 10 according to the Modification of the Fourth Embodiment, as shown in FIG. 51B, the side wall 13 may form a flare part 66 as explained in Modification 7 of the First Embodiment in a portion of the part under the protrusion 25. In FIG. 51B, a portion of the side wall 13 under the protrusion 25 from the lower end of the side wall 13 forms the flare part 66.5. Fifth Embodiment5-1. Configuration of the Lid

[0229] The lid 10 according to the Fifth Embodiment is formed similarly to the Third Embodiment or the Fourth Embodiment except a bend part 12 comprises an overhang 26, and at least an uneven part formed outward from the position defined as the boundary between the side wall 13 and the top surface 11 within the recessed part 27 of the inner surface 26A of the overhang 26 as shown in FIGS. 23A and 23B, which show an example where an uneven part 71 is further formed in the lid 10 of the Fourth Embodiment.Uneven Part

[0230] In the lid 10 according to the Fifth Embodiment, the uneven part 71 comprises a combination of multiple convex shapes 72 and concave shapes 73. The shapes of the convex shapes 72 and the concave shapes 73 are not particularly limited. In view of more securely suppressing possibilities of contents leaking from the inside of the container 101 at the opposing part between the lid 10 and the rim 103 of the container 101 when the lid 10 is used as a container with lid 150, it is preferable that the uneven part is a striped uneven part, with the convex shape 72 and the concave shape 73 each formed in a continuous annular stripe (linear) shape along the peripheral direction of the recessed part 27, as shown in FIGS. 23A and 23B. In this case, when the recessed part 27 is viewed in cross-section, the uneven part is formed in a wavy shape, making it easy to contact the rim 103 of the container 101 at multiple points, and more strongly suppressing possibilities of the contents in the container 101 leaking out from the opposing part between the lid 10 and the rim 103 of the container 101. However, this does not prohibit cases where the uneven part is not a striped uneven part. Although the uneven part 71 comprises an embossed uneven part in FIGS. 23A and 23B, the is not limited to be formed like this.

[0231] In the lid 10 according to the Fifth Embodiment, when the uneven part 71 is formed in the Fourth Embodiment as shown in FIGS. 23A and 23B, the uneven part 71 may also be formed in the portion of the protrusion 25 that faces the rim 103 when the lid 10 is attached to the container 101.6. Sixth Embodiment6-1. Configuration of the Lid

[0232] The lid 10 according to the Sixth Embodiment has a top surface 11 with an upwardly curved shape (a curved part 74 is formed in the top surface 11), as shown in FIG. 22. Otherwise, it has any of the configurations from the Third to Fifth Embodiments. FIG. 22 shows the top surface 11 of the Fourth Embodiment has an upwardly curved shape.

[0233] As described in the Third Embodiment, the Sixth Embodiment also involves attaching the lid 10 to the container 101 by hooking (fitting) the recessed portion 27 of the lid 10 onto one end of the rim 103 of the container 101. The lid 10 is moved to be loosen with upward diagonal distortion so that the side wall 13 on the opposite side from the hooked end is lifted up.

[0234] Subsequently, the lid 10 is pulled outward to fit the entire side wall 13 onto the rim 103 of the container 101. According to the Fifth Embodiment, the top surface 11 of the lid 10 is formed with a curved part 74, giving it an upwardly curve. This allows the top surface 11 to stretch and expand when the lid 10 is warped and pulled outward, with the top surface 11 capable of reshaping itself to accommodate the deformation. In order to facilitate achieving a configuration similar to that described in the Third Embodiment—where the lid 10 is attached to the container 101—also in the Sixth Embodiment as shown in FIG. 22, that the upper end of the curved part 74 is positioned at the same level as or underneath of the upper end of the overhang 26.7. Seventh Embodiment7-1. Configuration of the Lid

[0235] The lid 10 according to the Seventh Embodiment has any of configurations from the Third to Sixth Embodiments except that a fiber-containing sheet 80 is placed on the inner surface 26A of the overhang 26 as shown in FIGS. 34A and 34B. The fiber-containing sheet 80 placed on the inner surface 26A of the overhang 26 may be called as a third fiber-containing sheet. FIGS. 34A and 34B show the fiber-containing sheet 80 placed on the inner surface 26A of the overhang 26 for the Fourth Embodiment. In the lid 10 according to the Seventh Embodiment, as the fiber-containing sheet 80 is the same as one explained in Modification 9 of the First Embodiment, the details of the material and other aspects of the fiber-containing sheet 80 applied to the lid 10 according to the Seventh Embodiment is omitted.

[0236] As shown in FIG. 34A, the fiber-containing sheet 80 is arranged from the outer peripheral end of the undersurface 11B of the top surface 11, or from the surroundings of the outer peripheral end of the undersurface 11B of the top surface 11, along the inner surface 26A of the overhang 26 and outwards to a specified position. Further, as shown in FIG. 34A, the fiber-containing sheet 80 may be arranged up to the protruding end of the protrusion 25 or its surroundings. In the lid 10 according to the Seventh Embodiment, a recessed portion (recessed part 27) is formed on the inner surface side of the fiber-containing sheet 80.

[0237] In the lid 10 according to the Seventh Embodiment, the fiber-containing sheet 80 is placed on the inner surface 26A of the overhang 26. When the lid 10 is attached to the container 101 (container with lid 150) as shown in FIG. 41, the rim 103 of the container 101 (e.g., curl 108) is fitted into the recessed part 27 formed on the inner surface of the fiber-containing sheet.

[0238] Meanwhile, the fiber-containing sheet 80 makes contact with the container at the upper end 112, which lies above the outer peripheral surface 111 of the rim 103 (curl 108 in FIG. 41), while being substantially spaced apart from the inner peripheral surface 113 of the rim 103.

[0239] Preferably, the space between the fiber-containing sheet 80 and the inner circumferential surface portion 113 increases as fur as the place is away from the upper end 112.

[0240] Furthermore, in the lid 10 according to the Seventh Embodiment, even if there are irregularities on the inner surface 26A of the overhang 26 or the outer peripheral surface 111 of the rim 103, the fiber-containing sheet can serve as a packing to absorb the irregularities of the inner surface 26A and the outer peripheral surface 111 between the outer peripheral surface 111 of the rim 103 and the inner surface 26A of the overhang 26. This allows for the formation of the lid 10 being securely fitted to the rim 103 of the container 101.

[0241] According to the Seventh Embodiment, as described above, the rim 103 of the container 101 comes into contact with the fiber-containing sheet 80. When liquid is stored within the container 101, vibrations may cause the liquid to overflow the rim 103 and leak outward. In the Seventh Embodiment, even if liquid droplets attempt to escape over the rim 103, some of the droplets can penetrate into the coarse-rough and density regions of the fibers, which are supposed to be characteristic of the fiber-containing sheet 80 as illustrated in FIG. 39B. This makes droplets weaken in motion and to be fewer in volume and effectively suppresses their tendency to leak out.7-2. Modifications of the LidModification 1

[0242] In the lid 10 according to the Seventh Embodiment, as shown in FIGS. 35A, 35B, and 35C, the fiber-containing sheet is not only placed on the inner surface 26A of the overhang 26 but may also extend to the undersurface 11B of the top surface 11. This is called as Modification 1 of the Seventh Embodiment. FIG. 35A schematically showing a plan view of an example of the lid 10 according to Modification 1 of the Seventh Embodiment. FIG. 35B is a schematic cross-sectional view showing the R-R line vertical section of FIG. 35B. FIG. 35C is a schematic partial enlarged view showing an enlarged region EI enclosed by the dashed-dotted line in FIG. 35B. Note that FIG. 35A shows a case where a hole 16 for air vent is formed in the top surface 11.

[0243] The lid 10 according to Modification 1 of the Seventh Embodiment corresponds to one that further includes the configuration of the lid 10 according to Modification 9 of the First Embodiment. Meanwhile, in the lid 10 according to Modification 1 of the Seventh Embodiment, the fiber-containing sheet 80 covers the inner surface 26A of the overhang 26 and the undersurface 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 part of the fiber containing sheet 80 facing the undersurface 11B of the top surface 11 is similar to that explained in Modification 9 of the First Embodiment. As shown in FIG. 35C, in the part of the fiber-containing sheet 80 facing the undersurface 11B of the top surface 11, specifically the part facing the hole 16 for air vent and its surroundings, joining to the top surface 11 is avoided (non-joint part is formed). And, as also shown in FIG. 35C, a gap 83 is preferably created between the fiber-containing sheet 80 and the top surface 11 at the non-joint part 82. In others, as the portion of the fiber-containing sheet 80 facing the underside 11B of the top surface 11 corresponds to that in Modification 9 of the First Embodiment, and provided that the Embodiment is feasible, further description is omitted.Modification 2

[0244] In the lid 10 according to the Seventh Embodiment, as shown in FIGS. 36A, 36B, and 36C, the fiber-containing sheet 80 is not only placed on the inner surface 26A of the overhang 26 but may also be extended to connect adjacent small walls 14 on the inner peripheral surface 13A of the side wall 13. This is called as Modification 2 of the Seventh Embodiment. FIG. 36A schematically shows a plan view of the lid 10 according to Modification 2 of the Seventh Embodiment. FIG. 36B is a schematic cross-sectional view showing the S-S line vertical section of FIG. 36B. FIG. 36C is a schematic side view showing the lid 10 according to Modification 2 of the Seventh Embodiment.

[0245] The lid 10 according to Modification 2 of the Seventh Embodiment incorporates the configuration described in Modification 10 of the First Embodiment. However, in Modification 1 of the Seventh Embodiment, the fiber-containing sheet 80 covers the inner surface 26A of the overhang 26 and connects adjacent small walls 14 to be unified. That is, the fiber-containing sheet 80 has an integrated structure that combines the third fiber-containing sheet and the second fiber-containing sheet. The portion of the fiber-containing sheet 80 that connects adjacent small walls 14 applied to Modification 10 of the First Embodiment as described. The fiber-containing sheet 80 is preferably of a shape in a gear if it is affixed to the sheet material 55 to create the blank material 50 during the lid 10 being unfolded prior to shaping. More specifically, the fiber-containing sheet 80 includes an annular part 84 and a plurality of projecting pieces 85 that extend outward from the outer circumference of the annular part 84 and are arranged along the outer perimeter. These projecting pieces 85 are positioned to in accordance with the cut line 54 when the fiber-containing sheet 80 is placed on the sheet material 55. In such a fiber containing sheet 80 as illustrated in FIG. 36C, the annular part 84 may be used to form the part that covers the inner surface 26A of the overhang 26, while the individual projecting pieces 85 may be used to form the portions that connect adjacent small walls 14. Nonetheless, it does not exclude that the annular part 84 also serve to connect adjacent small walls 14, or the projecting pieces 85 also serve to cover the inner surface 26A of the overhang 26. As others, the configuration of the fiber-containing sheet that connects the small walls 14 is in substantially accordance with that given in Modification 10 of the First Embodiment, and provided that the Seventh Embodiment is feasible, the details are omitted.Modification 3

[0246] In the lid 10 according to the Seventh Embodiment as shown in FIGS. 37A and 37B, the fiber-containing sheet is not only placed on the inner surface 26A of the overhang 26 but may be also extended to the undersurface 11B of the top surface 11, and also connect the small wall 14 on the inner peripheral surface 13A of the side wall 13. This is called as Modification 3 of the Seventh Embodiment. FIG. 37A schematically shows a plan view of the lid 10 according to Modification 3 of the Seventh Embodiment. FIG. 37B is a schematic cross-sectional view showing the T-T line vertical section of FIG. 37B. FIGS. 37A and 37B show a hole 16 for air vent formed in the top surface 11.

[0247] The lid 10 according to Modification 3 of the Seventh Embodiment corresponds to one that further includes the configurations of the lids 10 according to Modification 9 and Modification 10 of the First Embodiment, and also corresponds to a combination of Modification 1 of the Seventh Embodiment and Modification 2 of the Seventh Embodiment.

[0248] The fiber-containing sheet 80 can adopt the third fiber-containing sheet, the first fiber-containing sheet and the second fiber-containing sheet are integrated. As explained in Modification 2 of the Seventh Embodiment, the fiber containing sheet 80 has preferably a gear-like shape when attached to the sheet material 55 that forms the sheet-like blank material 50 (i.e., lid 10 unfolded). Meanwhile, in Modification 3 of the Seventh Embodiment, unlike Modification 2 of the Seventh Embodiment, the fiber-containing sheet 80, as shown in FIGS. 38A and 38B, has a circular part 87 and a plurality of projecting pieces 85 extending outward from the outer peripheral rim of the circular part 87 and arranged along the outer peripheral rim. The plurality of projecting pieces 85 are interconnected via the circular part 87. The circular part 87 has an inner part 89 that faces the undersurface 11B of the top surface 11 when the lid 10 is formed, and an outer part 88 that faces the inner surface 26A of the overhang 26 when the lid 10 is formed, with the outer part 88 corresponding to the annular part 84 shown in Modification 2 of the Seventh Embodiment.

[0249] In the blank material 50, as shown in FIG. 38B, the fiber-containing sheet 80 is joined to the sheet material 55 in an annular shape within a part of the circular part 87. In FIG. 38B, the fiber-containing sheet 80 is annularly joined to the sheet material 55 in an annular region defined by the inner rim of the outer part 88 and a designated position within the inner part 89, and that annular part forms the joint part 86. In the blank material 50, the fiber-containing sheet 80 are not joined to the sheet material 55 in at least the plurality of projecting pieces 85. In the blank material 50 to form the lid 10 according to Modification 3 of the Seventh Embodiment, the sheet material 55 and the fiber-containing sheet 80 are partially joined, but the sheet material 55 and the fiber-containing sheet 80 is not joined in a part that corresponds to the outside of the joint part 86. “The part that corresponds to the outside of the joint part” here may include at least a part where the overhang 26 comes to be formed in the blank material 50 while the lid 10 is formed. Note that in FIG. 38B, the joint part 86 is formed in an annular shape, but this is mere an example, and the joint part 86 is not limited to this shape.

[0250] To form the lid 10 from the blank material 50, the blank material 50 is first bent in the direction indicated by arrow FD in FIG. 38B, resulting in the formation of overlaps 30 where portions of adjacent folding allowances 51 partially overlap. During this, as shown in FIG. 38B, the fiber-containing sheet 80 is bent so that multiple projecting pieces 85 are angled with respect to the inner portion 89. Subsequently, with the overlaps 30 formed, the folding allowances 51 and the fiber-containing sheet 80 are joined together and then adjacent small walls 14 are connected via the fiber-containing sheet 80.

[0251] According to the lid 10 of Modification 3 of the Seventh Embodiment, a structure combining Modification 1 of the Seventh Embodiment and Modification 2 of the Seventh Embodiment can be realized using the fiber-containing sheet 80 as a single piece, which can suppress the increased number of pieces to form.

[0252] In FIGS. 34A and 34B regarding the Seventh Embodiment, the side wall 13 extends downward further from the lower end of the protrusion 25, and the portion from the lower end of the protrusion 25 to the lower end 13C is tapered (diameter decreases), which is just an example. The side wall 13 may be formed such that the portion from the lower end of the protrusion 25 to the lower end 13C is flared (diameter increases), or such that the portion from the lower end of the protrusion 25 to the lower end 13C is substantially constant (straight). This also applies to Modifications 1 to 3 of the Seventh Embodiment as shown in FIGS. 40A and 40B. In FIG. 40A showing a cross-sectional view of Modification 3 of the Seventh Embodiment, the portion from the lower end of the protrusion 25 to the lower end 13C is formed to be substantially constant (straight). In FIG. 40B showing a cross-sectional view of Modification 3 of the Seventh Embodiment, the portion from the lower end of the protrusion 25 to the lower end 13C is formed to be flared (diameter increases).Modification 4

[0253] 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 37 of the side end 33 of the small wall 14. FIG. 48C is a cross-sectional view for explaining an example of the lid 10 according to Modification 4 of the Seventh Embodiment. FIG. 48C illustrates Modification 4 of the Seventh Embodiment, taking as an example explained in Modification 12 of the First Embodiment using FIGS. 44A-44C applied to the Seventh Embodiment.8. Eighth Embodiment

[0254] The lid 10 according to the Eighth Embodiment has the same as the First to Seventh Embodiments except the top surface 11 having a concave structure 201 and a drinking spout forming structure 218. In the Eighth Embodiment, the drinking spout forming structure 218 is located inside the concave structure 201 in a plan view of the top surface 11.8-1. First Example

[0255] The explanation will follow by using the example shown in FIGS. 52A-52D for the lid 10 according to the First Example of the Eighth Embodiment. FIGS. 52A and 52B are schematic plan and side views, respectively, illustrating the lid according to the Eighth Embodiment. FIGS. 52C and 52D are schematic cross-sectional views showing the cross-sectional state of FIG. 52A. FIGS. 52A-52D show the concave structure 201 and the drinking spout forming structure 218 formed on the top surface 11 of the lid according to the First Embodiment (First Example of the Eighth Embodiment).Drinking Spout Forming Structure

[0256] In the First Example of the Eighth Embodiment, the drinking spout forming structure 218 may adopt a structure similar to the drinking spout forming structure 18 explained in Modification 8 of the First Embodiment. Specifically, the drinking spout forming structure 218 is formed by a small opening 218A, a small lid 218B, a base 218D, and a hinge 218C. The small opening 218A, small lid 218B, base 218D, and hinge 218C may be configured similarly to the small opening 18A, small lid 18B, base 18D, and hinge 18C form the drinking spout forming structure 18, which is preferably provided close to the outer end of the top surface 11.

[0257] In the drinking spout forming structure 218, when the small lid 218B is lifted from the base 218D by the hinge 218C, the small opening 218A is exposed and it comes into the drinking spout.Concave Structure

[0258] A concave structure 201 is formed on the top surface 11. As shown in FIGS. 52A-52D, the concave structure 201 has an inclined surface 202 and a bottom 203.

[0259] The outer peripheral shape of the concave structure 201 is not particularly limited as in FIG. 52A, it may be a rectangular with a pair of short sides curved convexly outward, a polygonal, a shape with recesses, or a shape formed only by curves such as a circle or an ellipse.

[0260] The region for forming the concave structure 201 is not particularly limited as long as it is within the top surface 11 and it includes the drinking spout forming structure 218, but as shown in FIG. 52A, it is preferably a region inside the inner end of an area that faces the rim 103 when the lid 10 is attached to the container 101 (i.e., interior region inside the area corresponding to a part E opposing the rim 103 in FIG. 52C). This reduces the possibility that the inclined surface 202 of the concave structure 201 will worsen the fitness condition between rim 103 and lid 10.Bottom

[0261] As shown in FIGS. 52A-52D, the bottom 203 is formed by a flat surface having a specified area, which is the concave structure 201, it may be formed as a dot-like or a line in a plan view of the top surface 11. Specifically, in this view, the concave structure 201 may be a part that is recessed in a mortar shape inward from its outer rim (the bottom 203 is formed in dot at the deepest position of the mortar shape). The concave structure 201 may be a portion recessed inward from its rim into a cylindrical cross section. (the bottom 203 is formed with a line at the deepest position of the cylindrical shape). When forming the insertion part 205B, as described later, in the bottom 203, it is preferable that the bottom 203 is formed with a flat surface that has a designated area, as shown in FIGS. 52A-52D, by which the insertion part 205B can be entirely positioned in the bottom 203. This allows the tab 204 to be located lower than the outer peripheral rim of the top surface 11 as much as possible when the locking piece forming part 205A of the locking structure forming part 205 of the tab 204 (described later) is inserted into the insertion part 205B. Further, as shown in FIG. 53, it enables the small lid 218B to be located lower than the outer peripheral rim of the top surface 11 as much as possible. FIG. 53 is a schematic cross-sectional view showing the lid 10 according to the Eighth Embodiment with the small lid 218B open and the locking piece forming part 205A inserted into the insertion part 205B. In FIG. 53, the height direction of the outer peripheral rim of the top surface 11 (direction of Z-axis) is indicated by a dashed line, and it is shown that the upper end of the locking piece forming part 205A can be positioned under the dashed line TP. In FIG. 53, the reference numeral 231 indicates a tip end of the small lid 218B, and the reference numeral 230 indicates a tip end of the small opening 218A. The tip end 230 of the small opening 218A is defined as a part of the end of the small opening 218A that opposes the tip end 231 of the small lid 218B.

[0262] Regarding the arrangement of the bottom 203 and the drinking spout forming structure 218, the hinge 218C of the drinking spout forming structure 218 is preferably formed to be approximately the outer peripheral rim of the bottom 203. With such an arrangement, the small lid 218B can be positioned lower than the outer peripheral rim of the top surface 11 as possible when the locking structure forming part 205 of the tab 204 is inserted into the insertion part 205B.

[0263] The outer peripheral shape of the bottom 203 is not particularly limited. According to FIG. 52A, it may be rectangular, polygonal, a shape with recesses, or formed only by curves such as a circle or an ellipse.Inclined Surface

[0264] The inclined surface 202 is composed of a part that forms an inclined surface sloping diagonally downward from the outer peripheral rim of the concave structure 201 towards the bottom 203. The inclined surface 202 may be an inclined surface with a constant slope or a curved surface in its longitudinal cross-section. Additionally, the inclined surface 202 may have an angular shape or a chamfered shape (shape avoiding angles) in its cross-sectional outline. In FIGS. 52A-52D, the inclined surface 202 is an inclined surface with a constant slope in its longitudinal cross-section (cross-section on a plane parallel to the direction of Z-axis).

[0265] The lid 10 according to the Eighth Embodiment forms at least a part of the drinking spout forming structure 218 on the inclined surface 202. In order to mount the small lid 218B on the inclined surface 202, the drinking spout forming structure 218 is preferably entirely formed on the inclined surface 202 as shown in FIG. 52A. With such a formation, even if there is less movement in the tab 204 (even if the rotation angle of the small lid 218B with respect to the hinge 218C as the axis of rotation is small), the small lid 218B can be positioned lower than the outer peripheral rim of the top surface 11 as much as possible, as shown in FIG. 53.Tab

[0266] As shown in FIGS. 52A-52D, accessory members such as the tab 204 may be provided on the top surface 11. In FIG. 52A, a tab 204 is provided on the small lid 218B of the lid 10. By lifting the tab 204, the small lid 218B can be smoothly pulled up. In the lid 10, a designated portion on one end of the tab 204 forms a tab joint part 206 as a part joined to the small lid 218B. The tab joint part 206 may be a part where the tab 204 is adhered to the small lid 218B via an adhesive, or a part where the tab 204 is adhered to the small lid 218B by an ultrasonic welding method or the like.

[0267] The lid 10 may be provided with a locking structure forming part 205 for locking the tab 204 with keeping lift thereof. The locking structure forming part 205 is composed of a combination of a locking piece forming part 205A and an insertion part 205B.

[0268] The locking piece forming part 205A is formed so as to form a downwardly protruding part (locking piece LS) when the portion on the other end of the tab 204 (other end opposite to the one end where the tab joint part 206 is formed) is bent upward. In FIG. 52A, the locking piece forming part 205A is formed by a cut corresponding to the locking piece at a position away from the tab joint part 206. The locking piece forming part 205A is formed such that the locking piece LS has a protruding shape when the portion on the other end of the tab 204 is bent.

[0269] It is preferable that the insertion part 205B is formed so that the locking piece LS of the locking structure forming part 205 can be inserted when the tab 204 is pulled up. In FIG. 52A, the insertion part 205B is configured to be a part of a cut structure that penetrates the lid 10 in its thickness direction. The insertion part 205B is formed in the bottom 203.8-2 Second Example

[0270] In the lid 10 according to the second example of the eighth embodiment, as shown in FIGS. 54A-54C, a concave structure 201 and a drinking spout forming structure 218 are formed on the top surface 11 of the lid according to the seventh embodiment. As both structure are configurably the same as those in the first example of the eighth embodiment as described above, the details are omitted.

[0271] In the second example of the eighth embodiment, the outer peripheral end 201A located in a part outside the tip end of the small lid 218B as well as in the side directing from the hinge 218C towards the tip end of the small lid 218B within the concave structure 201, may approximately contact the inner end rim (end 28B) of the overhang 26. A part with gentle slope connected from the bend part 12 formed at the overhang 26 to the inclined surface 202 can be formed. It facilitates forming a flow from the inclined surface 202 to the bend part 12 without stagnation while the contents in the container with lid 150 is discharged from the small opening 218A to the upper surface (exposed surface) of the top surface 11. That is, it enables suppressing the liquid stagnation caused in the end 28B of the overhang 26.9. Ninth Embodiment

[0272] The lid 10 according to the ninth embodiment has any configurations of the first to eighth embodiments other than a drinking spout forming structure 218 and a groove 220 on the top surface 11, as shown in FIGS. 59A and 59B. As the drinking spout forming structure 218 is comprised of the small opening 218A, the small lid 218B, a base 218D, and a hinge 218C, similar to the structure recited in the eighth embodiment, the details are omitted. The lid 10 according to the ninth embodiment has a groove 220 formed so as to connect to the small opening 218A. FIGS. 59A and 59B show examples of a tab 204 and a locking structure forming part 205. As the locking structure forming part 205 is comprised of a combination of a locking piece forming part 205A and an insertion part 205B, as explained in the eighth embodiment, the details are omitted. As the tab 204 is also similar to one explained in the eighth embodiment, the details are omitted.Groove

[0273] In the ninth embodiment, the groove 220 is formed so that the exposed surface of the top surface 11 of the lid 10 is concave, and is formed to connect to the end of the small opening 218A facing the tip end 231 of the small lid 218B (called as the tip end 230 of the small opening 218A) when the small opening 218A is closed by the small lid 218B. In FIG. 59A, at least one groove 220 (three are shown in FIG. 59A) is formed to cross the tip end 230 of the small opening 218A. As the groove 220 only needs to extend from a certain position from the outer peripheral end 11A of the top surface 11 to the tip end 230 of the small opening 218, the groove 220 formed in the small lid 218B may be omitted.

[0274] The contour shape of the groove 220 is not particularly limited as shown in FIG. 59A, which depicts an elliptical contour shape when viewed from the top surface 11. The groove 220 can be formed by embossing the top surface 11.

[0275] According to the lid 10 of the ninth embodiment in which the groove 220 is formed at a certain position over the top surface 11, the contents in the container with lid 150 discharged from the small opening 218A to the exposed surface on the top surface 11 can flow along the groove and be poured back into the container, thereby readily suppressing the stagnation caused on the top surface 11.

[0276] In view of enhancing such effects, it is preferable that the groove 220 is formed gradually deeper from its longitudinal end towards the tip end of the small opening.

[0277] Preferably, the width WH1 of the tip end 231 in the small lid 218B of the drinking spout forming structure 218 (the value of width WH1 is substantially the same as the width of the tip end 230 in the small opening 218A) is approximately aligned with the width WH2 of the hinge 218C (the longitudinal length of the hinge 218C) to suppress the damage occurred in the small lid 218B granted that a large force is applied to the small lid 218B by being pulled up. This also applies to the drinking spout forming structure 218 or the drinking spout forming structure 18 provided in the first to eighth and the tenth embodiments.10. Tenth Embodiment

[0278] The lid 10 according to the tenth embodiment has a structure formed by forging a blank material 50 as shown in FIGS. 55A-55C. Other configurations of the lid 10 according to the tenth embodiment (top surface 11) may be formed similarly to the first to ninth embodiments.10-1 First Example

[0279] The explanation will follow with an example in which the lid 10 has an external shape corresponding to the first embodiment, as the lid 10 according to the first example of the tenth embodiment.Blank Material

[0280] The blank material 50 has a sheet-like configuration defined in accordance with the shape of the lid 10, and is comprised of a first corresponding part 52 and a second corresponding part 53. As recited in the first embodiment, a part in the blank material 50 corresponding to the top surface 11 of the lid 10 is the first corresponding part 52, and a part corresponding to the side wall 13 is the second corresponding part 53. As shown in FIGS. 55A-55C, the blank material 50 has a layer of a sheet material 55 and a fiber-containing sheet 80. In the sheet material 55 of the blank material 50 as shown in FIGS. 55A-55C, a plurality of cut lines 54 are formed to extend inward from the outer peripheral rim of the sheet material 55. Similar to the first embodiment, the parts interposed between adjacent cut lines 54 that are arranged side-by-side along the outer peripheral rim of the sheet material 55 come into folding allowances 51 that are bent during shaping of the blank material 50.

[0281] The fiber-containing sheet 80 is formed into a size that covers at least a part of the cut lines 54 (size that positions the outer rim of the fiber-containing sheet 80 outside the first corresponding part 52). In FIGS. 55A and 55B, the fiber-containing sheet 80 has a shape and size that allows it to almost completely overlap with the sheet material 55. As the material of the fiber-containing sheet 80 is the same as that in Modification 9 of the First Embodiment, the details are omitted.

[0282] In the lid 10 having a drinking spout forming structure 218 on the top surface 11, as explained in the eighth and ninth embodiments, it is preferable that the fiber-containing sheet 80 has an opening 243 formed in a part that correspond to the designated region that includes the area where the small opening 218A is formed, as illustrated in FIGS. 58A and 58B, which are a plan view and a cross-sectional view showing the lid according to the tenth embodiment. There is a slit 242 formed in the vicinity of the part of the fiber-containing sheet 80 that opposes the insertion part 205B.Joint Part Between Fiber-Containing Sheet and Sheet Material

[0283] In the blank material 50, the joint part 240 between the fiber-containing sheet 80 and the sheet material 55 is formed in the portion where the first corresponding part 52 and the fiber-containing sheet 80 face each other. This joint part 240 is called as the first joint part 240A. In FIGS. 55A and 55B, the joint part 240 between the fiber-containing sheet 80 and the sheet material 55 is formed over substantially the entire portion where the first corresponding part 52 and the fiber-containing sheet 80 face each other. However, this is just one example, and the first joint part 240A may be formed in a part of the portion where the first corresponding part 52 and the fiber-containing sheet 80 face each other, or it may be formed in a designated pattern. Examples of patterns for the first joint part 240A include a lattice pattern, a pattern composed of multiple dots, or a concentric annular pattern. Such patterns may also be similarly adopted for the second joint part 240B as described later. In FIGS. 55A and 55B, the joint parts 240 (both the first joint part 240A and the second joint part 240B) are indicated by areas enclosed by dashed lines and with hatching.

[0284] In the blank material 50, at the second corresponding part 53, the joint part 240 between the fiber-containing sheet 80 and the sheet material 55 is partially formed. This joint part 240 is called as the second joint part 240B. In FIG. 55A, the second joint part 240B is formed as a part that joins designated portions of each folding allowance 51 and the fiber-containing sheet 80. As the second joint part 240B is formed within the range of the second corresponding part 53, avoiding the part that comes into the overlaps 30. As FIG. 55A is an example, and in the blank material 50, the formation of the second joint part 240B may be omittable (i.e., in the second corresponding part 53, the fiber-containing sheet 80 and the sheet material 55 may be in a non-joined).Producing of the Lid

[0285] The lid 10 according to the Tenth Embodiment is obtained by forging a blank material 50 as shown in FIGS. 55A-55C. As a method for forging the blank material 50, a method of thermoforming the blank material 50 using the press mold or the like formed in a shape corresponding to the lid 10 can be exemplified. When forging the blank material 50, as shown in FIG. 55C, the folding allowances 51 are bent in the direction of arrow FD. Then, as explained in the First Embodiment, the lid 10 is obtained in such a way that the small walls 14 and the overlaps 30 are formed, and the side wall 13, the top surface 11, and the bend part 12 are formed. The external shape of the lid 10 formed by bending the folding allowances 51 in the direction of arrow FD as shown in FIG. 55C can be almost exemplified by the shape shown in the First Embodiment. Meanwhile, in the lid 10 according to the Tenth Embodiment, wrinkles and pleats are formed in the part of the fiber-containing sheet 80 corresponding to the second corresponding part 53 and offset from the second joint part 240B.

[0286] In the Tenth Embodiment, if the blank material 50 as shown in FIGS. 55A-55C is used, in addition to the shape corresponding to the lid according to the First Embodiment, it may be forged into shapes corresponding to any of the lids from Second to Ninth Embodiments.10-2. Second Example

[0287] Regarding the lid 10 according to the Second Example of the Tenth Embodiment, the explanation will follow by using a lid that have an external shape corresponding to the Seventh Embodiment as shown in FIG. 56A, which is a partial cross-sectional view showing the lid 10 according to the Second Example of the Tenth Embodiment and shows the second joint part 240B omitted in the blank material 50. The lid is formed into a shape corresponding to the Seventh Embodiment and can be obtained by forming it into a shape corresponding to the Seventh Embodiment using the blank material 50 used in the Tenth Embodiment. The overhang 26 and the protrusion 25 are formed when forging the lid 10 using the blank material 50.

[0288] In the overhang 26 of the lid 10 according to the Second Example of the Tenth Embodiment, the sheet material 55 and the fiber-containing sheet 80 may be in contact as shown in FIG. 56A. As illustrated in FIG. 56B, when the lid 10 is attached to the container 101 such that the rim 103 of the container 101 contacts the recessed part 27 formed on the inner surface 26A of the overhang 26, the fiber-containing sheet 80 can fill the gap between the sheet material 55 of the lid 10 and the container 101. When the sheet material 55 and the fiber-containing sheet 80 are in contact in the overhang 26, the sheet material 55 and the fiber-containing sheet 80 may or may not be adhered. FIG. 56B is a partial cross-sectional view for explaining a container with lid 150.

[0289] In the lid 10 according to the Second Example of the Tenth Embodiment, the side wall 13 may be formed such that the sheet material 55 and the fiber-containing sheet 80 are separated in the part under the protrusion 25 as shown in FIG. 56A. Such a lid 10 can be formed by using a blank material 50 where the second joint part is omitted in the part of the second corresponding part 53 that is outside the portion forming the protrusion 25.10-3. Third Example

[0290] Regarding the lid 10 according to the Third Example of the Tenth Embodiment, similar to the Second Example of the Tenth Embodiment described above, the explanation will follow by using the lid 10 having an external shape corresponding to the Seventh Embodiment.

[0291] Meanwhile, in the lid 10 according to the Third Example of the Tenth Embodiment, unlike the Second Example of the Tenth Embodiment described above in the overhang 26, the sheet material 55 and the fiber-containing sheet 80 partially or entirely separated is formed. As shown in FIG. 57A, a space 241 is formed in the part where the sheet material 55 and the fiber-containing sheet 80 are separated. That is, in the lid 10 according to the Third Example of the Tenth Embodiment, the bend part 12 is formed by the overhang 26, and the bend part 12 has the sheet material 55 and the fiber-containing sheet 80. Further, in the recessed part 27 formed on the inner surface 26A of the overhang 26, a space (space 241) is formed, interposed between the sheet material 55 and the fiber-containing sheet 80. FIG. 57A is a partial cross-sectional view showing the lid 10 according to the Third Example of the Tenth Embodiment.

[0292] Further, in the lid 10 according to the Third Example of the Tenth Embodiment, the sheet material 55 and the fiber-containing sheet 80 are preferably joined in the vicinities of the ends 28A and 28B of the overhang 26. As shown in FIG. 57B, when the rim 103 of the container 101 is fitted into the recessed part 27 formed on the inner surface 26A of the overhang 26 of the lid 10 and subsequently pressed into the recessed part 27, the fiber-containing sheet 80 and the space 241 can absorb the pressing force from the rim 103. Thus, even if there is a dimensional error between the rim 103 and the recessed part 27, it becomes easier to let the rim 103 and the recessed part 27 in close contact. FIG. 57B is a partial cross-sectional view for explaining a container with lid 150. In the lid 10 according to the Third Example of the Tenth Embodiment as shown in FIG. 57A, the side wall 13 is formed such that the sheet material 55 and the fiber-containing sheet 80 are in contact not only in the surroundings of the end 28B but also in at least a part of the portion under the end 28B.Producing the Lid

[0293] The lid 10 according to the Third Example of the Tenth Embodiment can be produced as follows. First, a blank material 50 where the second joint part is omitted is used. In the blank material 50, an adhesive or thermoplastic resin is placed between the sheet material 55 and the fiber-containing sheet 80 in the portion of the second corresponding part 53 that corresponds to the part under the end 28B (i.e., the part of the second corresponding part 53 that avoids the part corresponding to the overhang 26 and the part corresponding to the overlaps 30) (the adhesive or thermoplastic resin is arranged in the second corresponding part 53 such that the sheet material 55 and the fiber-containing sheet 80 are not joined).

[0294] Then, the blank material 50 is thermoformed using a press mold corresponding to the lid 10 according to the Third Example of the Tenth Embodiment. The press mold used is formed in a shape in view of the space 241 interposed between the sheet material 55 and the fiber-containing sheet 80. Further, when thermoforming the blank material 50 in the portion of the second part corresponding to the part under the protrusion 25, the sheet material 55 and the fiber-containing sheet 80 are joined by the aforementioned adhesive or thermoplastic resin.

[0295] Thus, by thermoforming the blank material 50, a space is created while the sheet material 55 and the fiber-containing sheet 80 are adhered at least in a portion under the end 28B of the overhang 26, thereby allowing the lid 10 to be obtained. The part corresponding to the overhang 26 in the blank material 50 is the part of the blank material 50 that comes into the overhang 26 when the lid 10 is formed from the blank material 50. The part corresponding to the overlaps 30 in the blank material 50 is the part of the blank material 50 that comes into the overlaps 30 when the lid 10 is formed from the blank material 50.11. Application ExamplesApplication Example 1

[0296] The lid 10 described above can be used for a container with lid 150 as shown in FIGS. 19A and 19B. FIG. 19A is a diagram showing an embodiment where the lid 10 according to the First Embodiment is attached to the rim 103 that forms the outer circumference of the opening 102 of a container 101 having an opening 102 formed at its upper end. In this embodiment, the lid 10 locked to the rim 103 is indicated. FIG. 19B is a schematic cross-sectional view showing the C-C line vertical section of FIG. 19A. The explanation of the container with lid 150 will follow by using FIGS. 3A and 3B.Container with Lid The container with lid 150 has a contact part 151 where the container 101 and the lid 10 contact each other, and the region of the lid 10 forming the contact part 151 is the contact region R. The joining method of the lid 10 with the container 101 is not particularly limited and can be appropriately selected from joining methods such as pressure joint or heat sealing.

[0297] The following will describe the lid 10 according to the First Embodiment used in a container with lid 150.

[0298] The container 101 has a container body 110 with a cylindrical side wall 104 and a bottom 107 that form an internal space 105, with the diameter increasing as extending upward (tapering downward), and an opening 102 open at the upper end of the container body 110 (upper end of the side wall 104). Although not shown, the opening 102 of the container 101 is formed in a circular shape. The container 101 shown here is just an example and does not limit the configuration of the container 101. The container 101 may have a rectangular opening 102. The container 101 only needs to be able to cover the opening 102 with the lid 10. Nevertheless, the shape of the lid 10 preferably fit in the shape of the container 101 (e.g., rectangular in both).

[0299] In the container 101 shown in FIGS. 19A, 19B, and the like, the rim 103 of the opening 102 has a flange, which may be a curl 108 formed by rolling the material forming the container body 110 outward, or it may be formed as a part (brim) extending outwardly in a planar manner.

[0300] Stored items in the container 101 (space 105) are not particularly limited and can be, e.g., liquids, solids, or a combination thereof. However, the lid of the present invention can have a significant effect when the contents are fluids such as liquids. That is, by dimensional errors in the container in which fluids such as liquids are stored, the contactness between the lid and the container is failed to let fluid leaked out of the container. Thus, it is by far important that the lid of the present invention can be securely attached to the container even if dimensional errors occur in the container, as it provides the said effect.

[0301] In the container with lid 150, the contact region R is formed on the undersurface (surface faced to the container) of the top surface, at the place close to the outer peripheral rim of the top surface, and also is preferably formed on the side wall. In the example of FIGS. 19A and 19B, the contact region R is formed on both the top surface and the side wall. The contact region R of the top surface is easily maintained because the contact region R is also formed on the side wall (the contact region R located on the side wall can generate friction between the side wall and the container, resulting in less separation between the top surface and the container). By the contact region R formed on the top surface, leakage of contents stored in the space 105 of the container 101 to the outside is suppressed.Application Example 2

[0302] When the lid 10 has an overhang, such as the lids 10 of the Third to Seventh Embodiments, as shown in FIG. 20, the container with lid 150 may have the rim 103 of the container placed in the recessed part 27 formed on the inner surface 26A side of the overhang 26. FIG. 20 is a cross-sectional view for explaining the lid 10 of the Third Embodiment fitted onto the container 101. The contact area between the rim 103 and the lid 10 can be increased, which makes it less likely for the contactness between the lid 10 and the container 101 to be failed, thereby suppressing the possibility of fluid leaking out of the container 101.Application Example 3

[0303] The lid 10 according to the present invention may be combined with a container 101 having an opening 102.

[0304] As described above, the present invention can be applied to many aspects. It can also be applied to methods of providing stores and packaging members in aspects other than those described above. Although the lid according to the present invention has been described in detail above, the foregoing is merely an example of the lid according to the present invention and is not limited thereto. Thus, appropriate modifications may be made without departing from the spirit of the present invention. Further, the configurations of the inventions described above may be used independently for each example of the invention, or the configurations of the inventions of the respective examples may be appropriately combined and applied.

[0305] Based on the description in this specification, the present invention may adopt the following configurations [E1]to [E21].

[0306] [E1] A lid configured to be attachable to a container having an opening and a rim that forms the opening, the lid in an attachment to the container comprising:

[0307] a top surface covering the opening,

[0308] a side wall formed circularly along an outer peripheral rim of the top surface,

[0309] a bend part at the outer peripheral rim of the top surface,

[0310] a plurality of small walls in contact with the top surface through the bend part to surround the periphery of the top surface, wherein

[0311] the bend part forms a boundary between the top surface and the side wall, the side wall has a structure formed by the plurality of the small walls and has overlaps that are partially overwrapped by adjacent small walls, wherein

[0312] small wall joint parts are formed in the overlaps to join the adjacent small walls.

[0313] [E2] The lid according to [E1], wherein each small wall includes an inner surface facing the container and an outer surface and is designated as a first small wall or a second small wall in each adjacent arrangement, a small wall joint part being configured to join the outer surface of the first small wall to the inner surface of the second small wall.

[0314] [E3] The lid according to [E1] or [E2], wherein each small wall has a proximal end and a tip end, and the width of at least a part of the small wall is larger at the tip end than at the proximal end.

[0315] [E4] The lid according to any one of [E1] to [E3], wherein each side wall has a shape that tapers from the bend part towards the lower end of the side wall.

[0316] [E5] The lid according to any one of [E1] to [E4], wherein each small wall includes a proximal end and a tip end, and the small wall joint part includes a part whose width increases gradually in a direction from the proximal end toward the tip end of the small wall.

[0317] [E6] The lid according to any one of [E1] to [E5], wherein the side wall and the bend part comprise a paper-based material.

[0318] [E7] The lid according to any one of [E1] to [E6], wherein each small wall has at least one resin layer.

[0319] [E8] The lid according to any one of [E1] to [E7], wherein the bend part is formed by an overhang.

[0320] [E9] The lid according to [E8], wherein a protrusion projects in a direction from the outer peripheral surface towards the inner peripheral surface of the side wall.

[0321] [E10] The lid according to any one of [E1] to [E9], wherein a fiber containing sheet is arranged on the undersurface of the top surface.

[0322] [E11] The lid according to [E8] or [E9], wherein a fiber-containing sheet is arranged on the inner surface of the overhang.

[0323] [E12] The lid according to any one of [E1] to [E11], wherein a fiber-containing sheet is arranged so as to connect adjacent small walls.

[0324] [E13] The lid according to any one of [E1] to [E12], wherein the bend part includes a sheet material and a fiber-containing sheet, and is formed by an overhang that has a space interposed between the sheet material and the fiber-containing sheet on the inner surface the overhang.

[0325] [E14] The lid according to any one of [E1] to [E13], wherein a small opening is provided in the top surface, and a groove connected to the small opening is formed.

[0326] [E15] The lid according to any one of [E1] to [E14], a concave structure and a drinking spout forming structure are further provided on the top surface, wherein the drinking spout forming structure is arranged inside the concave structure in a plan view of the top surface.

[0327] [E16] A blank material for forming the lid according to any one of [E1] to [E15], comprising a first corresponding part in accordance with the top surface, and a second corresponding part formed in a shape in accordance with the side wall.

[0328] [E17] The blank material for the lid according to [E16], wherein the blank material is formed from a circular sheet material, and the second corresponding part includes a plurality of cut lines extending inward from the outer peripheral rim of the sheet material such that the regions between adjacent cut lines correspond to the small walls once the lid formed.

[0329] [E18] The lid blank material according to [E17], wherein a fiber-containing sheet is arranged on the sheet material, and the sheet material and the fiber-containing sheet are partially joined.

[0330] [E19] The lid blank material according to [E18], wherein the fiber-containing sheet is formed in a gear shape.

[0331] [E20] A combination of a lid and a container comprising the lid according to any one of [E1] to [E15] and the container having an opening and a rim that forms the opening.

[0332] [E21] A container with a lid comprising the lid according to any one of [E1] to [E15] and the container having the opening and the rim that forms the opening, wherein the lid is configured to be attached to the container.Reference Signs List10: Lid

[0334] 11: Top surface

[0335] 11A: Outer peripheral edge

[0336] 11B: Undersurface

[0337] 12: Bend part

[0338] 13: Side wall

[0339] 13A: Inner peripheral surface

[0340] 13B: Outer peripheral surface

[0341] 13C: Lower end

[0342] 14: Small wall

[0343] 14A: First small wall

[0344] 14B: Second small wall

[0345] 14C: Third small wall

[0346] 15: Small wall joint part

[0347] 16: Hole

[0348] 17: Through-hole

[0349] 18: Spout forming structure

[0350] 18A: Small opening

[0351] 18B: Small lid

[0352] 18C: Hinge

[0353] 18D: Base

[0354] 19: Tab

[0355] 20: Non-woven fabric

[0356] 21: Backing sheet

[0357] 22: Small hole

[0358] 23: Opening

[0359] 24: Recess

[0360] 25: Protrusion

[0361] 26: Overhang

[0362] 26A: Inner surface

[0363] 27: Recessed part

[0364] 28: End

[0365] 28A: End

[0366] 30: Overlap

[0367] 31: Proximal end

[0368] 31A: End

[0369] 31B: End

[0370] 32: Tip end

[0371] 33: Side end part

[0372] 33A: First side end

[0373] 33B: Second side end

[0374] 34: Inner surface

[0375] 35: Outer surface

[0376] 36: Extended wall

[0377] 37: Base

[0378] 38: Edge

[0379] 39: Fold-back structure

[0380] 39A: First fold-back

[0381] 39B: Second fold-back

[0382] 40: Label structure

[0383] 41: Label display

[0384] 42: Label tag part

[0385] 43: Label tag

[0386] 44: Label pattern

[0387] 45: Gripping structure

[0388] 50: Blank material

[0389] 51: Folding allowance

[0390] 52: First corresponding part

[0391] 53: Second corresponding part

[0392] 54: Cut line

[0393] 55: Sheet material

[0394] 56: Notch

[0395] 57: Half-cut

[0396] 60: First folding allowance

[0397] 61: Second folding allowance

[0398] 63: Innermost end

[0399] 64: Outward projection

[0400] 65: Structure part

[0401] 66: Flare part

[0402] 67: Vertical pleat structure

[0403] 68: Inward fold

[0404] 70: Designated part distinguishable display

[0405] 71: Irregularity part

[0406] 72: Convex shape

[0407] 73: Concave shape

[0408] 74: Curved part

[0409] 80: Fiber-containing sheet

[0410] 81: Joint part

[0411] 82: Non-joint part

[0412] 83: Gap

[0413] 84: Annular part

[0414] 85: Projecting piece

[0415] 86: Joint part

[0416] 87: Circular part

[0417] 88: Outer part

[0418] 89: Inner part

[0419] 90: Through-hole

[0420] 91: Fiber

[0421] 92: Hole

[0422] 101: Container

[0423] 102: Opening

[0424] 103: Rim

[0425] 104: Side wall

[0426] 105: Space

[0427] 107: Bottom

[0428] 108: Curl

[0429] 110: Container body

[0430] 111: Outer peripheral surface

[0431] 112: Upper end

[0432] 113: Inner peripheral surface

[0433] 114: Gap

[0434] 150: Container with lid

[0435] 151: Contact part

[0436] 201: Concave structure

[0437] 202: Inclined surface

[0438] 203: Bottom

[0439] 204: Tab

[0440] 205: Locking structure forming part

[0441] 206: Tab joint part

[0442] 218: Drinking spout forming structure

[0443] 220: Groove

[0444] 240: Joint part

[0445] AR1: Arrow

[0446] AR2: Arrow

[0447] BM: Bending axis

[0448] BM1: Bending axis

[0449] BM2: Bending axis

[0450] CB: Center

[0451] CT: Center

[0452] D: Arrow

[0453] DE: Boundary

[0454] EI: Region

[0455] F1: Arrow

[0456] F1A: Arrow

[0457] F2: Arrow

[0458] F3: Arrow

[0459] FD: Arrow

[0460] H1: Distance

[0461] MC: Dashed-dotted line

[0462] MR: Dashed line

[0463] P1: Reference position

[0464] P2: Specified position

[0465] R: Contact region

[0466] SR1: Region

[0467] SR2: Region

[0468] T: Stress

[0469] V1: Arrow

[0470] WK: Region

Claims

1. A lid configured to be attachable to a container having an opening and a rim that forms the opening, the lid in an attachment to the container comprising:a top surface covering the opening,a side wall formed circularly along an outer peripheral rim of the top surface,a bend part at the outer peripheral rim of the top surface; anda plurality of small walls in contact with the top surface through the bend part to surround the periphery of the top surface, whereinthe bend part forms a boundary between the top surface and the side wall,the side wall has a structure formed by a plurality of the small walls and overlaps by the small walls in partially overwrapping with adjacent small walls, whereinsmall wall joint parts are formed in the overlaps to join the adjacent small walls.

2. The lid according to claim 1, wherein each small wall includes an inner surface facing the container and an outer surface and is designated as a first small wall or a second small wall in each adjacent arrangement, a small wall joint part being configured to join the outer surface of the first small wall to the inner surface of the second small wall.

3. The lid according to claim 1, wherein each small wall has a proximal end and a tip end, and the width of at least a part of the small wall is larger at the tip end than at the proximal end.

4. The lid according to claim 1, wherein the side wall has a shape that tapers from the bend part towards the lower end of the side wall.

5. The lid according to claim 1, wherein each small wall increases gradually in a direction from the proximal end toward the tip end of the small wall.

6. The lid according to claim 1, wherein the side wall and the bend part include a paper-based material.

7. The lid according to claim 1, wherein each small wall has at least one resin layer.

8. The lid according to claim 1, wherein the bend part is formed by an overhang.

9. The lid according to claim 8, wherein a protrusion is projects in a direction from the outer peripheral surface towards the inner peripheral surface of the side wall.

10. The lid according to claim 1, wherein a fiber-containing sheet is arranged on the undersurface of the top surface.

11. The lid according to claim 8, wherein a fiber-containing sheet is arranged on the inner surface of the overhang.

12. The lid according to claim 1, wherein a fiber-containing sheet is arranged so as to connect adjacent small walls.

13. The lid according to claim 1, wherein the bend part includes a sheet material and a fiber-containing sheet, and is formed by an overhang that has a space interposed between the sheet material and the fiber-containing sheet on the inner surface the overhang.

14. The lid according to claim 1, wherein a small opening is provided in the top surface, and a groove connected to the small opening is formed.

15. The lid according to claim 1, further comprising a concave structure and a drinking spout forming structure on the top surface, wherein the drinking spout forming structure is arranged inside the concave structure in a plan view of the top surface.

16. A lid blank material for forming the lid according to claim 1, comprising a first corresponding part in accordance with the top surface, and a second corresponding part formed in a shape in accordance with the side wall.

17. The lid blank material according to claim 16, wherein the blank material is formed from a circular sheet material, and the second corresponding part includes a plurality of cut lines extending inward from the outer peripheral rim of the sheet material such that the regions between adjacent cut lines correspond to the small walls once the lid formed.

18. The lid blank material according to claim 17, wherein a fiber-containing sheet is arranged on the sheet material, and the sheet material and the fiber-containing sheet are partially joined.

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

20. A combination of a lid and a container, comprising the lid according to claim 1 and the container having the opening and the rim that forms the opening.

21. A container with a lid comprising the lid according to any one of claim 1, and the container having the opening and the rim that forms the opening, wherein the lid is configured to be attached to the container.

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