Cover

Abstract

To provide a lid body with excellent sealing properties and a method for manufacturing the lid body.SOLUTION: The lid body has a canopy formed of a bent and molded material and having a top surface portion which has a folded portion at the outer peripheral edge and a peripheral surface portion which is continuous with the folded portion of the top surface portion so as to enclose a space of the top surface portion. The inner surface of the peripheral surface portion has an exposed region exposed in the space, and the peripheral surface portion has one or more recesses forming a concave surface in the exposed region. The one or more recesses are compressed in the thickness direction of the peripheral surface portion more than the lower edge of the exposed region of the peripheral surface portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lid body.

Background Art

[0002] As a lid body that can be attached to a container for storing contents such as beverages like coffee and prepared dishes, a lid body made of a paper-based material has been proposed.

[0003] As the lid body, one having a structure in which a canopy is provided and an annular wall material is attached to the outer periphery of the canopy is known. Usually, such a lid body is detachably attached to the container. In a state where the lid body is attached to the container, the opening of the container is covered with the canopy, and the opening edge of the body portion of the container contacts the wall material. A locking portion is formed at the contact portion between the wall material and the opening edge.

[0004] As the annular wall material used for the lid body, one in which a strip of paper is wound into a ring, the ends of the paper strip are overlapped to form an overlapping portion, and the ends constituting the overlapping portion are joined together has been proposed. However, since a step is formed at the overlapping portion, a gap is generated in the locking portion between the lid body and the container near the overlapping portion of the wall material, and there may be a situation where the contents leak unintentionally from the gap when the container is tilted or the like.

[0005] Therefore, there is a demand to reduce the gap generated between the step of the overlapping portion and the container in a state where the lid body is attached to the container.

[0006] As a method for reducing such a gap, for example, as shown in Patent Document 1, a technique of applying resin to a portion including the step of the overlapping portion to fill the step has been proposed.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] When resin is applied onto the overlapping portion of a lid body as in the lid body to which the technology proposed in Patent Document 1 is applied, the difference in the wall thickness of the side wall may become large between the portion where the resin is applied and the other portion. Therefore, since there is a possibility that a gap may be generated between the lid body and the container according to the difference in the wall thickness, there is room for further improvement in airtightness in terms of suppressing the leakage of the content from the locking portion between the lid body and the container when the container with the lid body attached is tilted. Further, the difference in rigidity is more likely to be further enlarged between the vicinity of the overlapping portion of the wall material of the lid body and the other portion, and when the lid body is attached to the container, distortion or breakage is likely to occur near the boundary between the vicinity of the overlapping portion of the wall material of the lid body and the other portion. There is also room for further improvement in airtightness from the point that the airtightness may be impaired if distortion or breakage occurs in the lid body. Further, in the technology proposed in Patent Document 1, when the content of the container is a liquid, further consideration is required for the components contained in the resin from entering the liquid.

[0009] An object of the present invention is to provide a lid body having excellent airtightness.

Means for Solving the Problems

[0010] The present invention is (1) A lid body comprising: a top surface portion having a bent portion at an outer peripheral edge; a peripheral surface portion having an upper end continuous with the top surface portion, and a canopy formed of a bent molded body; and an annular outer wall member joined to an outer peripheral surface of the peripheral surface portion and surrounding the canopy, wherein the bent molded body is formed by bending a blank material for the canopy, the blank material for the canopy is made of a film material, an inner peripheral surface of the peripheral surface portion has an exposed region exposed toward a space surrounded by the peripheral surface portion and the top surface portion, the peripheral surface portion has at least one recess forming a concave surface in the exposed region, and a corresponding portion of the outer wall member corresponding to the recess is compressed in a thickness direction of the outer wall member more than a portion corresponding to a lower end of the exposed region of the outer wall member. (2) The outer wall material is surface-bonded to the outer peripheral surface of the circumferential surface portion, and is the lid body according to (1) above. (3) The outer wall material has an annular structure in which two ends of a blank material for the outer wall are overlapped, and the blank material for the outer wall is made of a paper-based material, and is the lid body according to (1) above. (4) In the lid body according to (1) above, a corresponding portion of the outer wall material corresponding to the concave portion is compressed in the thickness direction of the outer wall material more than a portion corresponding to the lower end of the exposed region of the outer wall material. (5) In the lid body according to (1) above, the upper end of the outer wall material extends upward beyond the upper surface of the top surface portion. (6) In the lid body according to (1) above, one concave portion is formed, and the concave portion forms one concave surface over the entire exposed region. (7) In the lid body according to (1) above, a plurality of concave portions are formed, and the plurality of concave portions form a plurality of concave surfaces periodically in the vertical direction of the canopy. (8) In the lid body according to (1) above, the concave surface is formed closer to the upper side than the lower end of the exposed region. (9) In the lid body according to (1) above, the concave portion is formed in an annular shape along the circumferential direction of the circumferential surface portion. (10) In the lid body according to (1) above, the lower end of the circumferential surface portion is located closer to the center of the top surface portion than the upper end of the circumferential surface portion. (11) In the lid body according to (1) above, a locking portion for locking to the opening edge of the container is formed in the exposed region of the circumferential surface portion. (12) In the lid body according to (1) above, a flange portion extending outward is provided at the lower end of the circumferential surface portion. is the gist.

Advantages of the Invention

[0011] According to the present invention, the lid body includes a canopy having a bent molded body formed by a top surface portion and a circumferential surface portion continuous with the top surface portion at a bent portion formed on the outer peripheral edge of the top surface portion. Therefore, on the circumferential surface portion of the canopy, the configuration of an overlapping portion such as an outer wall material is removed, and the same material can be used over the entire circumference of the circumferential surface portion.

[0012] Furthermore, in the bent molded body, wrinkles may occur at the bent portions depending on how the molding process is carried out. In this regard, in the lid according to the present invention, a predetermined region (exposed region) of the peripheral surface portion is exposed, and a concave surface is formed in the exposed region. In the present invention, since a portion (concave portion) for forming a concave surface is formed on the inner peripheral surface of the peripheral surface portion, even if the top lid is formed of a bent molded body, wrinkles are less likely to occur on the inner peripheral surface side of the peripheral surface portion. And in the present invention, the portion for forming the exposed region can form a locking portion for locking the opening edge of the container.

[0013] Thus, according to the present invention, it is possible to form a state in which a step is omitted and a state in which wrinkles are less likely to occur in the portion (locking portion) that contacts the container on the peripheral surface portion and locks the opening edge of the container. Therefore, according to the present invention, the lid can be more closely attached to the container. That is, according to the present invention, a lid with excellent airtightness can be obtained.

[0014] Also, according to the present invention, the lid joins an annular outer wall material to the outer peripheral surface of the peripheral surface portion that is continuous at the bent portion of the top surface portion, so that a lack of strength in the peripheral surface portion is less likely to occur. Therefore, when the lid is attached to the container, even if a force is applied outward from the container to the peripheral surface portion, the shape of the peripheral surface portion is easily maintained, and a situation where the locking state formed by bringing the opening edge into contact with the exposed region of the peripheral surface portion is unintentionally released can be suppressed.

[0015] Also, according to the present invention, since the top lid is formed of a film material and an annular outer wall material is joined to the outer peripheral surface of the peripheral surface portion, even if the film material is relatively thin, a lid having sufficient strength can be formed. Furthermore, when the film material has translucency, when the lid is attached to the container, the locking state between the container and the lid can be visually recognized, and it is possible to visually confirm whether the container and the lid are correctly attached. Also, it is possible to visually recognize the inside of the container from the outside.

[0016] Further, according to the present invention, when a flange portion is provided on the lid body, it is less likely that the strength of the peripheral surface portion is insufficient. Therefore, when the lid body is attached to the container, even if an outward force is applied to the peripheral surface portion from the container, the shape of the peripheral surface portion is likely to be maintained, and a locking state formed by bringing the opening edge portion into contact with the exposed region of the peripheral surface portion can be prevented from being unintentionally released.

[0017] According to the manufacturing method of the present invention, it becomes possible to manufacture a lid body that can exhibit the above-described effects.

Brief Description of the Drawings

[0018]

Figure 1

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Figure 15

Figure 16

[0019] Hereinafter, an example and the like according to the present invention will be described with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

[0020] The following description is a preferred specific example of the present invention, and the content of the present invention is not limited to these embodiments. In the following description, directions such as front and rear, left and right, up and down are shown for convenience of explanation, but the content of the present invention is not limited to these directions. In the examples of FIGS. 1 to 16, the Z-axis direction is the vertical direction (the upper side is the +Z direction, and the lower side is the -Z direction), the X-axis direction is the front-rear direction (the front side is the +X direction, and the rear side is the -X direction), and the Y-axis direction is the left-right direction (the right side is the +Y direction, and the left side is the -Y direction), and the description will be made based on this. The relative size ratios of the sizes and thicknesses of the respective parts shown in each of FIGS. 1 to 16 are for convenience of description and do not limit the actual size ratios unless otherwise specified.

[0021] [1 First Embodiment] [1-1 Configuration] As shown in FIGS. 1, 2, and 3, the lid body 1 according to the first embodiment of the present invention includes a top lid 2. As will be described later with reference to FIG. 4 and the like, the lid body 1 can be attached to, for example, the opening edge portion 130 of a bottomed container T with an open upper end side. At this time, as the container T, a container having flexibility at the opening edge portion 130 is preferably used. However, this does not prohibit the container T from being a container with little or almost no flexibility, such as a metal container. The lid body 1 can be attached to a container with little flexibility and a container with no flexibility.

[0022] (Top lid) The top lid 2 has a top surface portion 4 and a peripheral surface portion 5. The top lid 2 is formed by integrally molding a top lid blank material described later, and the top surface portion 4 and the peripheral surface portion 5 are integrally formed.

[0023] (Top surface portion) The top surface portion 4 is a portion that covers the opening 140 of the container T when the lid body 1 is attached to the container T. The shape of the top surface portion 4 may be determined according to the shape of the container T, and examples include a circular shape, an elliptical shape, a triangular shape, a rectangular shape, a polygonal shape, and a chamfered shape. Further, the top surface portion 4 may be a horizontal plane, a curved surface, or a surface having irregularities, but in the examples shown in FIGS. 1 and 2, it is configured by a horizontal plane (a plane parallel to the XY plane spanned by the X-axis and the Y-axis).

[0024] (Bending portion) In the top lid 2, a bending portion 6 is formed on the outer peripheral edge 4a of the top surface portion 4. The bending portion 6 may have a bent shape or a curved shape. The outer peripheral edge 4a of the top surface portion 4 is defined in a predetermined region from the outer peripheral end 40a of the top surface portion 4 to a position inward by a predetermined distance from the outer peripheral end 40a.

[0025] (Peripheral surface portion) The peripheral surface portion 5 is continuous with a bent portion 6 formed at the outer peripheral edge 4a of the top surface portion 4, and extends downward with the boundary with the bent portion 6 as the upper end 50a of the peripheral surface portion 5. In the examples of FIGS. 1 to 3, the peripheral surface portion 5 extends obliquely downward toward the center line m. In the canopy 2, a space 20 surrounded by the peripheral surface portion 5 and the top surface portion 4 is formed, and the space 20 is open downward. That is, the peripheral surface portion 5 is formed so as to surround the space 20 formed on the lower side than the top surface portion 4. The peripheral surface portion 5 contacts the opening edge portion 130 of the container T when attached to the container T.

[0026] (Exposed area) The inner peripheral surface 5a of the peripheral surface portion 5 has an exposed area 19 that is exposed to the space 20. A locking portion 15 for locking to the opening edge portion 130 of the container T is formed in the exposed area 19 of the peripheral surface portion 5. It is preferable that the exposed area 19 is formed in an annular shape in the circumferential direction of the peripheral surface portion 5 from the viewpoint that the locking portion 15 can be formed over the entire circumference of the inner peripheral surface 5a of the peripheral surface portion 5. In the examples of FIGS. 1 to 3, the upper end 19a of the exposed area 19 is located on the inner peripheral surface 5a side at the position of the upper end 50a of the peripheral surface portion 5, and the lower end 19b of the exposed area 19 is located on the inner peripheral surface 5a side at the position of the lower end 50b of the peripheral surface portion 5, and the entire inner peripheral surface 5a of the peripheral surface portion 5 forms the exposed area 19.

[0027] (Locking portion) The locking portion 15 is a portion formed on the peripheral surface portion 5 for locking the lid body 1 to the container T in a state of contacting the opening edge portion 130 of the container T. The region corresponding to the locking portion 15 on the inner peripheral surface 5a of the peripheral surface portion 5 may be formed over the entire exposed area 19, may be formed in a part of the exposed area 19, or may be a region including a part of the exposed area 19. Further, the region corresponding to the locking portion 15 on the inner peripheral surface 5a of the peripheral surface portion 5 may be formed over the entire concave surface 7a, may be formed in a part of the concave surface 7a, may be formed in a region including the entire concave surface 7a, or may be a region including a part of the concave surface 7a.

[0028] (Concave portion) The peripheral surface portion 5 forms a concave portion 7. The concave portion 7 is a portion (inner peripheral surface side concave surface forming portion) that forms a concave surface 7a in the exposed region 19 of the inner peripheral surface of the peripheral surface portion 5. In the examples shown in FIGS. 1 to 3, it is preferable that the concave portion 7 is compressed in the thickness direction of the peripheral surface portion 5 rather than the portion corresponding to the lower end 19b of the exposed region 19 among the portions of the peripheral surface portion 5. The concave portion 7 can be formed by compressing a predetermined portion among the portions corresponding to the peripheral surface portion 5 in the blank material for the canopy. The concave portion 7 can be formed during or after forming the bent molded body constituting the canopy 2. Since the concave portion 7 is formed by compression, the shape retention property of the portion of the concave portion 7 can be improved. Also, even when the opening edge portion 130 of the container T contacts the concave surface 7a of the concave portion 7 and an outward force is applied to the concave surface 7a, the shape of the concave portion 7 can be maintained more strongly. However, this is not limited to the case where the concave portion 7 is formed by compressing a predetermined position of the portion corresponding to the peripheral surface portion 5 of the blank material for the canopy. For example, as shown in Modification Example 1 of the second embodiment described later, when an outer wall member 3 is provided outside the peripheral surface portion 5 and a concave surface 17 is formed in the corresponding portion 16 (the portion corresponding to the concave portion 7) of the outer wall member 3, the concave portion 7 may be a non-compressed portion having a convex surface that follows the concave surface of the corresponding portion 16 on its outer surface side.

[0029] In the examples of FIGS. 1 to 3, one concave portion 7 is formed in the peripheral surface portion 5. And in the concave portion 7, a concave surface 7a is formed on the inner peripheral surface 5a side. In the examples of FIGS. 1 to 3, the concave surface 7a of the concave portion 7 is formed closer to the upper side than the lower end 19b of the exposed region 19, and the concave surface 7a of the concave portion 7 is the region corresponding to the locking portion 15 in the exposed region 19 on the inner peripheral surface 5a side of the peripheral surface portion 5. Also, in the examples of FIGS. 1 to 3, the concave portion 7 is formed in an annular shape along the circumferential direction of the peripheral surface portion 5. Note that in the examples of FIGS. 1 to 3, the peripheral surface portion 5, the exposed region 19, and the locking portion 15 are also formed in an annular shape.

[0030] In the examples of FIGS. 1 to 3, the concave portion 7 has the outer peripheral surface 5b side of the circumferential surface portion 5 as a non-formed surface of unevenness. However, this does not prohibit the concave portion 7 from forming an uneven surface on the outer peripheral surface 5b side of the circumferential surface portion 5. For example, in the concave portion 7, a convex surface or a concave surface may be formed on the outer peripheral surface 5b side. At this time, the convex surface or the concave surface may be a curved surface or a bent surface.

[0031] The formation region of the concave surface 7a by the concave portion 7 may be a partial region or the entire region of the exposed region 19 as shown in FIGS. 1 to 3 and FIG. 5A. In the examples of FIGS. 1 to 3, a case where one concave surface 7a is formed in a partial region of the exposed region 19 is shown, and FIG. 5A illustrates a case where one concave surface 7a is formed in the entire region of the exposed region 19. Further, the region where the concave surface 7a is formed is preferably a region corresponding to the locking portion 15 in the exposed region 19 of the inner peripheral surface 5a. In this case, as will be described later, it becomes easy to form a state in which the opening edge portion 130 of the container T is in close contact with the region where the concave surface 7a is formed. However, this does not prohibit that, as shown in FIG. 5A, the region where the concave surface 7a is formed corresponds to a partial region of the region corresponding to the locking portion 15 or is formed in a region included in the region corresponding to the locking portion 15.

[0032] In the above description, one concave portion 7 is formed, but as shown in FIG. 5B, a plurality of concave portions 7 may be formed. In FIG. 5B, the concave portions 7 periodically form a plurality of concave surfaces 7a in the vertical direction. Then, an uneven surface is formed on the exposed region 19 of the circumferential surface portion 5 by the plurality of concave surfaces 7a. In the example of FIG. 5B, the uneven surface forms a continuous wavy surface. Note that this is an example, and the uneven surface is not limited to a wavy surface, and may be, for example, a continuous mountain shape or may form non-uniform unevenness.

[0033] (Material constituting the lid) The material constituting the canopy 2 is not particularly limited, and examples thereof include paper-based materials, non-paper-based materials, combinations thereof, laminates, and the like. Examples of paper-based materials include not only so-called papers manufactured by adhering plant fibers and other fibers, but also chemical fiber papers, synthetic papers, water-resistant papers, coated papers, alternative papers, parchment papers, wool papers, glass fiber papers, stone papers, ceramic papers, and the like. Examples of non-paper-based materials include cloth-based materials (woven fabric materials and non-woven fabric materials), resin-based materials, metal-based materials, wood-based materials, glass-based materials, and the like. When a paper-based material and a non-paper-based material are combined, examples include those in which a hole is formed in a part of a sheet made of a paper-based material and a non-paper-based material is attached to the hole. Examples of non-woven fabric materials include so-called airlaid sheets formed by binding pulverized pulp accumulated by an air flow into a sheet shape, pulp-based materials, and non-woven fabrics of fibers such as natural fiber materials and synthetic fibers. Examples of resin-based materials include resin-made film materials and sheet materials, and for example, film materials and sheet materials of synthetic resins, natural resins, and biodegradable resins can be mentioned. Among resin-based materials, film materials and sheet materials of biodegradable resins can be preferably used. The film material indicates a material that is thin enough to be deformed by its own weight, and the sheet material indicates a material that has a thickness enough to maintain its shape by its own weight.

[0034] From the viewpoints of environmental impact and ease of handling, it is preferable that the material constituting the canopy 2 is formed of a paper-based material as a whole for both the top surface portion 4 and the peripheral surface portion 5. However, this does not limit all of the material constituting the canopy 2 to a paper-based material when all of the material constituting the canopy 2 is the same material. For example, the material constituting the canopy 2 may be a resin-made film. Note that a part of the canopy 2 (for example, only the top surface portion 4) may be made of a resin-made film.

[0035] The top cover 2 can be obtained by forming a concave portion 7 in a bent molded body formed by bending, for example, a blank material for the top cover formed by punching a raw material as described later. As the raw material of the blank material for forming the top cover (raw material for forming the top cover), various materials applicable as the top cover 2 can be used.

[0036] (Wrinkle) When obtaining the top cover 2 by bending the blank material for the top cover, generally, wrinkles are likely to occur in the bent portion 6 and the peripheral surface portion 5. In this regard, in the peripheral surface portion 5, a state where the wrinkles are stretched is likely to be formed due to the formation of the concave surface 7a. That is, in the region from the bent portion 6 to the peripheral surface portion 5, the concave surface 7a is likely to have fewer wrinkles than the region outside the concave surface 7a. Note that having fewer wrinkles means that the formation of wrinkles is suppressed or there are no wrinkles. It is more preferable that the formation of wrinkles is approximately completely suppressed in the concave surface 7a, and it is ideal that there are no wrinkles in the concave surface 7a. Note that a shallow wrinkle means that the depth of the wrinkle is smaller, and a fine wrinkle means that the width of the wrinkle is smaller.

[0037] (Positional relationship between the upper end 50a and the lower end 50b of the peripheral surface portion 5) Assuming a plane α including a center line m along the thickness direction (Z-axis direction) of the top cover 2 passing through the center K of the top cover 2, and assuming a cut surface (corresponding to FIG. 3) obtained by cutting the inner peripheral surface 5a of the peripheral surface portion 5 with the plane α, as shown in FIG. 3, in that cut surface, it is preferable that the distance from the center line m to the upper end 50a of the peripheral surface portion 5 is longer than the distance from the center line m to the lower end 50b. That is, the position A1 corresponding to the lower end 50b is preferably located closer to the center of the top surface portion 4 (closer to the inside of the lid body 1 in the inside-outside direction of the lid body 1) than the position A2 corresponding to the upper end 50a of the peripheral surface portion 5 when the thickness direction of the top surface portion 4 is the line-of-sight direction (-Z direction). Note that the position A1 and the position A2 are positions defined on the same cut surface. Also, a straight line mp described later is assumed to be located on the same cut surface.

[0038] When the position A1 is closer to the inside of the lid body 1 than the position A2 on the peripheral surface 5 of the lid body 1, the inner peripheral surface 5a of the peripheral surface 5 of the lid body 1 is likely to be formed so as to face obliquely upward. That is, the direction of the line L orthogonal to the straight line mp passing through the position A1 and the position A2 is likely to face obliquely upward toward the center line m. In such a case, when the opening edge portion 130 of the container T is pushed into the space 20 surrounded by the peripheral surface 5 of the lid body 1, even if a force acting outward on the peripheral surface 5 acts on the opening edge portion 130 due to the restoring force of the opening edge portion 130 of the container T trying to move outward, the opening edge portion 130 is further pushed into the peripheral surface 5, and it is likely to act in a direction to strengthen the locking state between the opening edge portion 130 and the concave portion 7.

[0039] However, the description of the positional relationship between the upper end 50a and the lower end 50b of the peripheral surface 5 is a preferred example. In the lid body 1 according to the first embodiment, as shown in FIG. 6, the distance from the center line m to the lower end 50b and the distance from the center line m to the upper end 50a of the peripheral surface 5 may be approximately equal.

[0040] [1-2 Effects] As shown in Fig. 4, the lid 1 according to the first embodiment can be attached to the opening edge 130 of the bottomed container T with an open upper end. The container T includes a bottom surface portion 120 and a cylindrical body member 110. The container T forms a space portion 160 for accommodating the contents by joining the inner peripheral surface of the cylindrical body member 110 around the bottom surface portion 120. The container T has an opening at the upper side of the space portion 160 to form an opening portion 140. An opening edge 130 that defines the opening portion 140 is formed along the upper end edge of the body member 110. As the container T, one having flexibility at the opening edge 130 is preferably used. In the example of Fig. 4, a container curl portion 150 for locking is formed in an outward curl at the opening edge 130. The container curl portion 150 can be formed by curling the end portion corresponding to the opening edge 130 of the blank material for forming the body member 110 outward. Note that the container T shown in Fig. 4 is an example, and does not limit the container to which the lid 1 can be attached. Also, in Fig. 4, gaps are formed between the container curl portion 150 and the upper end 50a of the peripheral surface portion 5 of the lid 1, and between the container curl portion 150 and the outer peripheral edge 4a of the top surface portion 4. However, the positional relationship between the container curl portion 150 and the lid 1 is not limited to the example of Fig. 4. The gaps between the container curl portion 150 and the upper end 50a of the lid 1, and between the container curl portion 150 and the outer peripheral edge 4a of the top surface portion 4 are preferably small, and it is more preferable from the viewpoint of closely attaching the lid 1 to the container T that the gaps do not exist, that is, the upper end 50a and the outer peripheral edge 4a of the top surface portion 4 are in surface contact with the container curl portion 150.

[0041] When attaching the lid body 1 to the container T, the lid body 1 is tilted obliquely relative to the opening 140 of the container T, and the exposed area 19 of the peripheral surface portion 5 of the lid body 1 is brought into contact with a predetermined position (contact start point) of the opening edge portion 130 of the container T. Next, while maintaining the contact state between the opening edge portion 130 and the exposed area 19, the inclination of the lid body 1 is brought closer to the horizontal. Along with this, the contact area between the opening edge portion 130 and the exposed area 19 expands along the opening edge portion 130 from the contact start point, and the opening edge portion 130 is gradually pushed into the space 20. Eventually, a state is formed in which only a predetermined portion (protruding portion) of the opening edge portion 130 is located outside the peripheral surface portion 5. Further, a portion of the peripheral surface portion 5 located near the upper side of the protruding portion is locally elastically deformed and expanded outside the protruding portion of the opening edge portion 130. And the opening edge portion 130 is pushed into the space 20 while also bringing the protruding portion into contact with the exposed area 19.

[0042] When the container T has flexibility at the opening edge portion 130, the opening edge portion 130 pushed into the space 20 may attempt to act an outward restoring force on the exposed area 19. However, the opening edge portion 130 is further pressed within the concave surface 7a of the concave portion 7, and the opening edge portion 130 is more easily held within the concave portion 7.

[0043] In the present invention, the one provided with the peripheral surface portion 5 in which the overlapping portion 9 itself is omitted as the top lid 2 is used, and in the peripheral surface portion 5, the concave portion 7 forming the concave surface 7a in the exposed area 19 is formed. For this reason, since the surface area of the inner peripheral surface 5a of the peripheral surface portion 5 is enlarged and the wrinkles are stretched, a state in which wrinkles are less likely to occur in the exposed area 19 can be formed. Thus, the lid body 1 can be attached more closely to the container T. Also in this regard, according to the present invention, a lid body 1 having excellent airtightness can be obtained. Further, when the lid body is formed using the manufacturing method described later, the generation of wrinkles in the peripheral surface portion 5 can be more suppressed. For this reason, the closeness between the lid body 1 and the container T can be further improved.

[0044] [2 Second Embodiment] [2-1 Configuration] As shown in FIGS. 7 to 9, the lid 1 according to the first embodiment of the present invention may further include an annular outer wall member (second embodiment).

[0045] (Outer wall member) In the lid 1 according to the second embodiment, the outer wall member 3 has an annular structure and is joined to the outer peripheral surface 5b of the peripheral surface portion 5, surrounding the top lid 2. The outer wall member 3 is formed by rounding an outer wall blank material 300 having a predetermined shape into an annular shape, and includes an overlapping portion 9 where two end portions 31, 32 of the rounded outer wall blank material 300 are overlapped, and a wall member joining portion 10 that joins the end portions 31, 32 to each other at the overlapping portion 9. The outer wall member 3 is preferably surface-joined to the outer peripheral surface 5b of the peripheral surface portion 5.

[0046] As the base material for forming the outer wall blank material 300, a paper-based material is used. Therefore, as the outer wall blank material 300, a paper-based material is used. As the paper-based material, various paper-based materials as described above regarding the material constituting the peripheral surface portion 5 can be appropriately used. In the examples of FIGS. 7 to 9, a paper-based material formed in a fan shape is used as the base material for forming the wall member, and two end portions 31, 32 spaced apart along the circumferential direction of the paper-based material are overlapped with each other to form an overlapping portion 9. Here, the end portions 31, 32 refer to portions from the edge of the outer wall blank material 300 to a predetermined position in the inner direction.

[0047] (Wall member joining portion) The wall member joining portion 10 is formed by joining the two end portions 31, 32 to each other at at least a part of the overlapping portion 9, preferably the whole of the overlapping portion 9. Examples of the joining method of the two end portions 31, 32 include methods such as an adhesive, a hot melt adhesive, a two-component adhesive, heat sealing, and ultrasonic joining. Heat sealing and ultrasonic joining are preferably used.

[0048] (Peripheral surface shape of the outer wall member) From the perspective of enabling closer bonding to the outer peripheral surface 5b of the peripheral surface portion 5, the shape of the peripheral surface (inner peripheral surface 3a and outer peripheral surface 3b) of the outer wall member 3 is preferably a shape that matches the shape of the outer peripheral surface 5b of the peripheral surface portion 5 of the canopy 2. In the examples shown in FIGS. 7 to 9, the outer peripheral surface 5b of the peripheral surface portion 5 is a non-formed surface with unevenness, and similarly, the inner peripheral surface 3a of the outer wall member 3 is also a non-formed surface with unevenness.

[0049] (Side joint part) In the example of FIG. 1 and the like, as described above, the inner peripheral surface 3a of the outer wall member 3 is joined to the outer peripheral surface 5b of the peripheral surface portion 5 at a predetermined position below the upper end 30a of the outer wall member 3, and it is preferable that the peripheral surface portion 5 and the outer wall member 3 are in surface contact. The connection portion between the peripheral surface portion 5 and the outer wall member 3 is called a side joint portion 8. The structure of the side joint portion 8 is not particularly limited as long as it is a portion that joins the peripheral surface portion 5 and the outer wall member 3. For example, it may be an adhesive layer formed by applying an adhesive between the peripheral surface portion 5 and the outer wall member 3. Also, in the case where at least one of the peripheral surface portion 5 and the outer wall member 3 is a coated paper with a resin or the like coated on the surface, the side joint portion 8 may be a joint portion formed when the peripheral surface portion 5 and the outer wall member 3 are directly joined by heat sealing or the like.

[0050] Regarding the outer wall member 3 as well, when comparing the position B1 facing the position A1 and the position B2 facing the position A2 in the same manner as the peripheral surface portion 5, it is preferable that the position B1 is closer to the inside of the lid body 1 in the inside-outside direction of the lid body 1 than the position B2. In this case, it becomes easier to maintain the state where the outer wall member 3 is closer to the inside of the lid body 1 at the position A1 than at the position A2 of the peripheral surface portion 5.

[0051] (Vertical positions of the upper and lower ends of the outer wall member) From the perspective of further enhancing the shape retention of the lid body 1, it is preferable that the outer wall member 3 is arranged so as to completely cover the outer peripheral surface 5b of the peripheral surface portion 5. In the examples of FIGS. 7 to 9, the position of the upper end 30a of the outer wall member 3 is slightly above the position corresponding to the upper end 50a of the peripheral surface portion 5. The position of the lower end 30b of the outer wall member 3 is the position corresponding to the lower end 50b of the peripheral surface portion 5.

[0052] [2-2 Effects] When the lid 1 according to the second embodiment is attached to the container T, the entire opening edge 130 is pushed into the space 20 and a state where the opening edge 130 is pressed against the exposed area 19 is formed, similar to the lid 1 according to the first embodiment. And thereafter, since the shape of the peripheral surface portion 5 is held by the outer wall member 3 formed of a paper-based material, the state where the opening edge 130 is pushed into the space 20 while being pressed against the exposed area 19 is likely to be maintained. In particular, when the outer wall member 3 and the peripheral surface portion 5 are surface-bonded, the state of the exposed area 19 becomes more stable, so that the stability of the state where the opening edge 130 is pushed into the space 20 is likely to be improved, and it becomes difficult for the opening edge 130 to unintentionally and easily detach from the concave portion 7 of the peripheral surface portion 5.

[0053] According to the present invention, since the lid 2 having the peripheral surface portion 5 continuous with the top surface portion 4 is formed by the bent portion 6 formed on the outer peripheral edge 4a of the top surface portion 4, and the outer wall member 3 joined to the outer peripheral surface 5b of the peripheral surface portion 5 of the lid 2, the peripheral surface portion 5 is disposed on the inner peripheral surface 3a side of the outer wall member 3. Therefore, even when the overlapping portion 9 is formed on the outer wall member 3, the step 11 of the overlapping portion 9 formed on the inner peripheral surface 3a side of the outer wall member 3 is concealed by the peripheral surface portion 5. The lid 2 is formed of a bent molded body, and the configuration corresponding to the overlapping portion 9 is omitted from the peripheral surface portion 5. Therefore, when the opening edge 130 of the container T is locked by the peripheral surface portion 5 of the lid 1, the lid 1 is more closely attached to the container T. That is, according to the present invention, a lid 1 having excellent airtightness can be obtained.

[0054] [2-3 Modification] (Modification 1) Regarding the lid body 1 according to the second embodiment, in the above example, the outer peripheral surface 5b of the peripheral surface portion 5 was a non-formed surface of unevenness, but it is not limited to this. As shown in FIG. 10, the outer peripheral surface 5b of the peripheral surface portion 5 may be a formed surface of unevenness. In FIG. 10, in the concave portion 7 of the peripheral surface portion 5, a convex surface 7b is formed on the outer peripheral surface 5b side, and a concave surface 17 is formed in a portion (corresponding portion 16) of the outer wall member 3 corresponding to the concave portion 7 so as to face the convex surface 7b. The portion corresponding to the concave portion 7 shall indicate a portion of the outer wall member 3 that is at the same position in the vertical direction with respect to the concave portion 7.

[0055] In the corresponding portion 16, the outer wall portion 34 of the outer wall member 3 is compressed to form the concave surface 17 on the inner peripheral surface 3a side of the outer wall member 3. The corresponding portion 16 is compressed in the thickness direction of the outer wall member 3 more than a portion corresponding to the lower end 19b of the exposed region 19 of the outer wall member 3 (in the example of FIG. 10, the lower end 30b of the outer wall member 3). The shape of the concave surface 17 on the inner peripheral surface 3a in the corresponding portion 16 is preferably a shape following the convex surface 7b on the outer peripheral surface 5b of the peripheral surface portion 5. Such a shape can be specifically formed, for example, by applying pressure in the direction from the inner peripheral surface 5a to the outer peripheral surface 3b at a predetermined position on the inner peripheral surface 5a of the peripheral surface portion 5. That is, by the above pressure, the concave portion 7 is formed. At this time, a concave surface 7a is formed on the inner peripheral surface 5a of the peripheral surface portion 5, and a convex surface 7b is formed on the outer peripheral surface 5b. Also, a concave surface 17 is formed on the inner peripheral surface 3a side of the corresponding portion 16 corresponding to the concave portion 7. In this case, the concave portion 7 may be formed as a compressed portion by compression of a predetermined position of a portion corresponding to the peripheral surface portion 5 of the top cover blank material, or may be a non-compressed portion. In any case where the concave portion 7 is a compressed portion or a non-compressed portion, it is preferable that the convex surface 7b on the outer peripheral surface 5b side of the concave portion 7 has a shape following the concave surface 17 of the corresponding portion 16.

[0056] In addition, in FIG. 10, the corresponding portion 16 has a surface on the outer peripheral surface 3b side as a non-formed surface of unevenness. However, as shown in FIG. 11, an uneven surface may be formed on the outer peripheral surface 3b side of the corresponding portion 16. In FIG. 11, a convex surface 18 is formed on the outer peripheral surface 3b side of the corresponding portion 16. However, in this case, the convex surface 18 on the outer peripheral surface 3b side of the corresponding portion 16 is preferably curved more gently than the concave surface 17 on the inner peripheral surface side of the corresponding portion 16. Also, it is preferable that the height Q2 of the convex surface 18 is smaller than the depth Q1 of the concave surface 17. In this case, even if the convex surface 18 is formed, the corresponding portion 16 can be used as a compression portion.

[0057] (Modification Example 2) As shown in FIGS. 12A, 12B, etc., in the lid body 1 according to the second embodiment, the upper end 30a of the outer wall member 3 may extend (be extended) above the upper surface of the top surface portion 4 (Modification Example 2 of the second embodiment). The portion of the outer wall member 3 above the upper surface of the top surface portion 4 is referred to as the upper outer wall portion 35. FIG. 12A shows an example of the lid body 1 according to the second embodiment in which unevenness is not formed on the inner peripheral surface 3a side of the corresponding portion 16 and the upper outer wall portion 35 is formed. FIG. 12B shows an example of the lid body 1 according to the second embodiment in which a concave surface 17 is formed on the inner peripheral surface 3a side of the corresponding portion 16 and the upper outer wall portion 35 is formed.

[0058] According to the lid body 1 according to Modification Example 2 of the second embodiment, the formation of the upper outer wall portion 35 makes it easy to attach and detach the lid body 1 from the container T to which the lid body 1 is attached. The formation of the upper outer wall portion 35 increases the volume ratio of the outer wall member 3 formed of a paper-based material in the members constituting the lid body 1, and can improve the shape retention of the top lid 2. Also, the stacking property is improved.

[0059] (Modification Example 3) In Modification 2 of the second embodiment, an annular curl portion 100 formed in an outer wrap manner may be formed along the upper end of the upper outer wall portion 35 (the upper end 30a of the outer wall member 3) (FIGS. 13A and 13B). In the examples of FIGS. 13A and 13B, an opening surrounded by the curl portion 100 is formed on the upper end 30a side of the outer wall member 3 in the lid body 1. FIG. 13A shows an example in the case where an opening surrounded by the curl portion 100 is formed on the upper end 30a side of the outer wall member 3 for the lid body 1 shown in FIG. 12A. FIG. 13B shows an example in the case where an opening surrounded by the curl portion 100 is formed on the upper end 30a side of the outer wall member 3 for the lid body 1 shown in FIG. 12B.

[0060] In the lid body 1, when the curl portion 100 is formed at the position of the upper end 30a of the outer wall member 3, the shape of the outer wall member 3 becomes more likely to be stabilized, and the stability of the state where the opening edge portion 130 is pushed into the lid body 1 when the container T is attached to the lid body 1 is likely to be improved. For this reason, it is less likely that the opening edge portion 130 is easily detached from the locking portion 15 of the peripheral surface portion 5 unintentionally. Further, when the curl portion 100 is formed on the outer wall member 3, it is possible to reduce the risk that the end face of the outer wall blank material 300 for forming the outer wall member 3 is exposed at the upper end 30a. Therefore, even when the content in the container T with the lid body 1 attached is a liquid such as coffee, when drinking the content with the mouth near the upper end 30a, the contact with the mouth to the lid body 1 can be made good. From the viewpoint of reducing the risk that the end face of the outer wall blank material for forming the outer wall member 3 is exposed at the upper end 30a, the formation at the position of the upper end 30a of the outer wall member 3 is not limited to the curl portion 100. For example, as shown in FIGS. 16A and 16B, it may be a folded-back portion 101. In FIG. 16A, the folded-back portion 101 is formed as a portion where the outer wall member 3 is folded outward on the upper end 30 side of the outer wall member 3. In FIG. 16B, the folded-back portion 101 is formed as a portion where the outer wall member 3 is folded inward on the upper end 30 side of the outer wall member 3.

[0061] (Modification 4) As shown in Modification Example 2 and Modification Example 3 of the second embodiment, when the upper outer wall portion 35 is formed, as shown in FIG. 15, a raised portion 71 that bulges upward along the outer peripheral end 40a of the outer peripheral edge 4a of the top surface portion 4 may be formed (Modification Example 4). The raised portion 71 is preferably formed at a position closer to the outer peripheral end 40a among the outer peripheral edges 4a of the top surface portion 4.

[0062] (Raised portion) In the top surface portion 4 of the lid body 1, as shown in FIG. 15, a raised portion 71 is formed upward at a position closer to the boundary between the bent portion 6 and the peripheral surface portion 5. In this example, a concave curved surface 71a is formed on the lower surface side of the raised portion 71, and a convex curved surface corresponding to the concave curved surface 71a is formed on the upper surface side of the raised portion. The size (raised height and width) of the raised portion 71 is not particularly limited. For example, the raised portion 71 may be formed to have a size such that the upper side of the container curl portion 150 of the container T fits into the concave curved surface 71a on the lower surface side thereof. In this case, it becomes possible to bring both the concave surface 7a and the concave curved surface 71a into contact with the container curl portion 150, and when the lid body 1 and the container T are mounted, the lid body 1 can be more closely attached to the container T.

[0063] (Function and effect) According to such a lid body 1, since the raised portion 71 that bulges upward along the outer peripheral end 40a of the outer peripheral edge 4a of the top surface portion 4 is formed, it is possible to effectively suppress the occurrence of a situation where the content flowing down on the upper outer wall portion 35 accumulates at the boundary between the top surface portion 4 and the outer wall member 3.

[0064] When obtaining the lid 2 by bending the blank material for the lid, wrinkles may occur from the bent portion 6 of the outer peripheral edge 4a of the top surface portion 4 to the peripheral surface portion 5. In this regard, in the bent portion 6 continuous with the peripheral surface portion 5, since the raised portion 71 is formed, a state is easily formed in which the wrinkles from the bent portion 6 to the peripheral surface portion 5 are stretched. In particular, even if wrinkles are formed within the locking portion 15 of the peripheral surface portion 5, the formation number of wrinkles at the locking portion 15 in the peripheral surface portion 5 can be made smaller due to the formation of the raised portion 71. For this reason, the locking portion 15 formed on the peripheral surface portion 5 can be brought into closer surface contact with the opening edge portion 130.

[0065] [3 Third Embodiment] [3-1 Configuration] As shown in FIGS. 14A and 14B, a flange portion 14 extending outward may be provided on the lid body 1 of the first embodiment or the second embodiment (third embodiment). FIG. 14A shows an example in which the flange portion 14 is formed on the lid body 1 according to the first embodiment, and FIG. 14B shows an example in which the flange portion 14 is formed on the lid body 1 according to the second embodiment. In either case, the size of the flange portion 14 is not particularly limited. Further, the flange portion 14 may be formed on a part of the peripheral surface portion 5 along the lower end 50b of the peripheral surface portion 5, but from the viewpoint of enhancing the effect of improving the shape stability of the peripheral surface portion 5, it is preferably formed over the entire circumference of the peripheral surface portion 5 along the lower end 50b of the peripheral surface portion 5.

[0066] [3-2 Operational Effects] As shown in the third embodiment, by providing the flange portion 14 on the lid body 1, the shape of the peripheral surface portion 5 can be further stabilized. Therefore, according to the third embodiment, even when an outward force acts from the opening edge portion 130 to the peripheral surface portion 5 when attaching the container T to the lid body 1, it is possible to regulate the shape of the lower end 50b side of the peripheral surface portion 5 from deforming outward.

[0067] Next, the manufacturing method of the lid of the present invention will be described in detail. Taking the case of manufacturing the lid according to the second embodiment above and the case where the entire lid 1 is formed of a paper-based material as an example, it will be described below.

[0068] [4 Manufacturing method] [4-1 Content of the manufacturing method] First, a raw material made of a paper-based material is punched into a circular shape to obtain a blank material for the top cover. Then, the top surface portion 4 and the peripheral surface portion 5 are formed by integrally forming the blank for the top cover. The integral molding can be exemplified by bending. Specifically, with the outer peripheral edge portion of the blank material for the top cover fixed, the blank material for the top cover is bent, thereby integrally forming the top cover 2 having the top surface portion 4 and the peripheral surface portion 5 continuous at the bent portion 6 (shaping step).

[0069] The bending can be realized, for example, by performing a press working process. The press working process can be performed, for example, as shown below.

[0070] First, the outer peripheral edge portion of the blank material for the top cover is fixed by a blank holder. In this state, the blank material for the top cover is sandwiched between molds having a shape corresponding to the shape of the top cover 2, and the blank material for the top cover is pressed by the molds. At this time, the blank material for the top cover is shaped into the shape of the top cover 2. Various conditions such as the temperature, pressure, and humidity of the press working process are not particularly limited and may be determined according to conditions such as the shape of the top cover 2 and the material of the blank material for the top cover. Therefore, the press working process may be performed in a non-heated state or in a heated state. Also, it may be performed in a humid state or in a non-humid state. From the viewpoint of realizing a more precise shaping in the press working process, it is preferable that the press working process is performed under a heated state and a humid state.

[0071] When the roof 2 is manufactured by the shaping process, it is possible to avoid forming a configuration corresponding to the step 11 due to the overlapping portion 9 in the outer wall member 3 on the peripheral surface portion 5. Further, after preliminarily fixing the blank material for the roof with a blank holder, by performing a pressing process, it is possible to suppress the formation of wrinkles on the peripheral surface portion 5. From the viewpoint of further suppressing the formation of wrinkles, it is preferable that the blank holder is arranged so as to fix the entire circumference of the blank material for the roof.

[0072] Also, a blank material for the wall member is prepared. As the blank material for the wall member, for example, a material obtained by punching a raw material made of a paper-based material into a fan shape can be used. The end portions 31 and 32 of the blank material for the wall member are overlapped to form an overlapping portion 9, and a wall member joint portion 10 is formed at the overlapping portion 9. The method for forming the wall member joint portion 10 is not particularly limited as described above, and for example, a method such as ultrasonic welding can be adopted. Thereby, the annular outer wall member 3 is formed.

[0073] An annular outer wall member 3 is joined to the outer peripheral surface 5b of the peripheral surface portion 5 of the top cover 2 (joining step). In the joining step, the inner peripheral surface 3a of the outer wall member 3 and the outer peripheral surface 5b of the peripheral surface portion 5 are joined. For the joining process, heat sealing or the like can be used. Specifically, an adhesive is previously applied to the outer peripheral surface 5b of the peripheral surface portion 5, and with the peripheral surface portion 5 of the top cover 2 pressed against the inner peripheral surface 3a of the outer wall member 3, a roller is pressed against and pressurized from the inner peripheral surface 5a side of the peripheral surface portion 5. The roller rotates along the inner peripheral surface 5a side of the peripheral surface portion 5 while rotating. At this time, it is preferable that the roller is in a heated state. Note that the above-described joining process is an example, and the joining process is not limited to this method. For example, coated paper having a coating layer formed on the surface with a resin or the like is used as the blank material for the top cover and the blank material for the wall member, and the coating layers are faced with each other for the peripheral surface portion 5 of the top cover 2 and the inner peripheral surface 3a of the outer wall member 3, and a roller is pressed against and heated and pressurized. Other joining methods may be used. At this time, as the roller, it is preferable to use one having a shape corresponding to the concave portion 7 formed on the peripheral surface. In this case, it is also possible to perform a step (compression step) of forming the concave portion 7 in the peripheral surface portion 5 in the joining step. For example, when the concave portion 7 forms a concave curved surface as the concave surface 7a, the compression step is specifically realized by using, as the roller, one having a convex curved surface corresponding to the concave surface 7a formed on its peripheral surface, and compressing the blank material for the top cover or the blank material for the outer wall from the inner peripheral surface 5a side of the peripheral surface portion 5 of the top cover 2 with the roller. Even if wrinkles are formed in the peripheral surface portion 5 in the shaping step when the concave portion 7 is formed, the wrinkles in the peripheral surface portion 5 can be spread and the wrinkles in the peripheral surface portion 5 can be made less. Note that by controlling the pressing force of the roller on the peripheral surface portion 5, a convex surface 7b can be formed on the outer peripheral surface 5b side of the concave portion 7 and a concave surface 17 can also be formed in the corresponding portion 16 to the outer wall member 3. Further, a convex surface 18 can also be formed on the outer peripheral surface 3b side of the corresponding portion 16 of the outer wall member 3.

[0074] [4-2 Effects] According to the above-described method for manufacturing a lid body, a lid body excellent in airtightness and with the generation of wrinkles in the side surface portion more restricted can be manufactured.

[0075] As described above, each embodiment of the present invention and its modifications have been specifically described. However, the present invention is not limited to the above-described embodiments and their modifications, and various modifications based on the technical idea of the present invention are possible. The configurations, methods, steps, shapes, materials, numerical values, etc. of the above-described embodiments and their modifications can be combined with each other as long as they do not deviate from the gist of the present disclosure.

Explanation of Reference Numerals

[0076] 1 Lid 2 Canopy 3 Wall material 3a Inner peripheral surface of the wall material 3b Outer peripheral surface of the wall material 4 Top surface 4a Outer peripheral edge of the top surface 5 Peripheral surface 5a Inner peripheral surface of the peripheral surface 5b Outer peripheral surface of the peripheral surface 6 Bending part 7 Recess 7a Concave surface 7b Convex surface 8 Side joint 9 Overlapping part 10 Wall material joint 11 Step 14 Flange part 15 Locking part 16 Corresponding part 17 Concave surface of the corresponding part 18 Convex surface of the corresponding part 41 Back surface of the top surface 71 Protrusion 71a Concave curved surface 100 Curl part

Claims

1. A lid having a top surface portion with a bent portion at its outer periphery, and a peripheral surface portion whose upper end is continuous with the top surface portion, the lid being formed of a bent molded body, and an annular outer wall member joined to the outer peripheral surface of the peripheral surface portion and surrounding the lid, wherein the bent molded body is formed by bending a blank material for the lid, the blank material for the lid is made of a film material, the inner peripheral surface of the peripheral surface portion has an exposed region exposed toward the space surrounded by the peripheral surface portion and the top surface portion, the peripheral surface portion has at least one recess forming a concave surface in the exposed region, a corresponding portion of the outer wall member corresponding to the recess is compressed in the thickness direction of the outer wall member more than a portion corresponding to the lower end of the exposed region of the outer wall member, a lid body.

2. The outer wall member is surface-bonded to the outer peripheral surface of the peripheral surface portion, The lid body according to Claim 1.

3. The outer wall member has an annular structure in which two end portions of a blank material for the outer wall are overlapped, the blank material for the outer wall is made of a paper-based material, The lid body according to Claim 1.

4. A corresponding portion of the outer wall member corresponding to the recess is compressed in the thickness direction of the outer wall member more than a portion corresponding to the lower end of the exposed region of the outer wall member, The lid body according to Claim 1.

5. The upper end of the outer wall member extends upward beyond the upper surface of the top surface portion, The lid body according to Claim 1.

6. One recess is formed, the recess forms one concave surface over the entire exposed region, The lid body according to Claim 1.

7. A plurality of recesses are formed, the plurality of recesses form a plurality of concave surfaces periodically in the vertical direction of the lid, The lid body according to Claim 1.

8. The concave surface is formed closer to the upper side than the lower end of the exposed region, The lid body according to Claim 1.

9. The recess is formed annularly along the circumferential direction of the peripheral surface portion, The lid body according to Claim 1.

10. The lower end of the peripheral surface portion is located closer to the center of the top surface portion than the upper end of the peripheral surface portion, The lid body according to Claim 1.

11. A locking portion for locking to the opening edge of the container is formed in the exposed region of the peripheral surface portion, The lid body according to Claim 1.

12. A flange portion extending outward is provided at the lower end of the peripheral surface portion, The lid body according to Claim 1.

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