Lid, container with lid, combination of lid and container, and method for manufacturing a lid

Abstract

The present invention provides a lid, a container with a lid, a combination of a lid and a container, and a method for manufacturing a lid, which can suppress moisture penetration into the fibers constituting the lid and allow the container and lid to be bonded by a sealing method even if the types of resins constituting the resin coating layer formed on the surface of the container are diverse. [Solution] The lid is formed to be in contact with a container having a rim and is formed from a blank material, the blank material having a fiber sheet containing fibers made from a paper-based material, and a resin material is attached to at least some of the fibers that form the interior of the fiber sheet.

Description

Technical Field

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

Background Art

[0002] It is widely practiced to provide a container with an opening formed at its upper end and containing food and drink products etc. (hereinafter also referred to as "contents") with a lid attached thereto in a closed state inside the container.

[0003] As a lid to be attached to a container, from the viewpoint of reducing environmental impact, it is required to use one made of a paper-based material. As a method for attaching a lid to a container, a method (sealing method) of joining the lid to an edge portion forming the outer periphery of the opening at the upper end of the container using a method such as hot pressing is known. As a method for ingesting the contents contained in the lid, a method of removing the lid and a method of providing a tab as in the lid described in Patent Document 1 are known. In the lid disclosed in Patent Document 1, when a user picks up and pulls up the tab, a bell-shaped or gourd-shaped hole opens, and a drinking mouth is formed.

[0004] Also, as a method for attaching a lid to a container, when the lid has a top surface portion, a bent portion, and a side wall portion, a method (fitting method) of forming a state in which the lid is brought into contact with an edge portion forming the outer periphery of the opening at the upper end of the container by fitting a structural portion such as a combination of the bent portion, the top surface portion, and the side wall portion to the edge portion of the container is known. As a method for forming such a lid, a method of forming by shaping a blank material for forming the lid is known.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] In the technology described in Patent Document 1, when the lid is made of a paper-based material, there is a risk that moisture may penetrate into the fibers constituting the lid, significantly impairing its rigidity and reducing its strength. Therefore, there is room for improvement in suppressing moisture penetration into the fibers constituting the lid.

[0007] Furthermore, to suppress moisture penetration, it is conceivable to form a resin layer on the surface of the lid (on the surface facing the container, etc.). However, the surface of a container usually has a resin coating layer formed for waterproofing, and depending on the material of the resin material constituting the resin layer, the adhesion with the resin constituting the resin coating layer may be impaired, potentially making it difficult to bond the container and the lid using a sealing method. Therefore, there is room for improvement in ensuring that the container and the lid can be bonded using a sealing method even if the types of resin constituting the resin coating layer formed on the surface of the container are diverse.

[0008] Furthermore, when the lid is made of a paper-based material, and the lid's top surface, curved sections, and side walls are formed by shaping a blank material, there is a possibility that the shape may return to its original state after the side walls, curved sections, etc., are formed due to the restorative force of the paper-based material. If the shape returns to its original state in the curved sections, etc., even if the lid is fitted onto the container, the contact between the lid and the container may loosen, making it easier for gaps to form between the lid and the container, and there is a risk that the contents of the container may spill out through the gaps.

[0009] The present invention has been made in view of these problems, and aims to provide a lid, a container with a lid, a combination of a lid and a container, and a method for manufacturing a lid, which can suppress moisture penetration into the fibers constituting the lid and can bond the container and the lid by a sealing method even if the types of resin constituting the resin coating layer formed on the surface of the container are diverse. Furthermore, a further object of the present invention is to provide a lid, a container with a lid, a combination of a lid and a container, and a method for manufacturing a lid, which can suppress the return of the shape of the blank material after shaping. [Means for solving the problem]

[0010] The gist of this invention is the invention described in (1) below.

[0011] (1) A lid that is formed to be in contact with a container having a rim, and is formed from a blank material, the blank material having a fiber sheet containing fibers made of a paper-based material, and a resin material is attached to at least some of the fibers that form the interior of the fiber sheet. [Effects of the Invention]

[0012] According to the present invention, a lid, a container with a lid, a combination of a lid and a container, and a method for manufacturing a lid are provided that can suppress moisture penetration into the fibers constituting the lid, and that can bond the container and the lid by a sealing method even if the types of resin constituting the resin coating layer formed on the surface of the container are diverse. Furthermore, when the lid is formed by shaping a blank material, it is possible to provide a lid, a container with a lid, a combination of a lid and a container, and a method for manufacturing a lid that can suppress the return of the shape after shaping the flank material. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1A is a plan view showing one embodiment of the cover according to the first embodiment. Figure 1B is a schematic cross-sectional view showing the state of the longitudinal section along line AA in Figure 1A. Figure 1C is a cross-sectional view showing a part of the circumferential surface of the through-hole. [Figure 2] Figures 2A and 2B are cross-sectional views showing one embodiment of the inclined portion of the lid according to the first embodiment. [Figure 3] Figure 3A is a plan view showing one embodiment of the lid according to Modification 1 of the first embodiment. Figure 3B is a plan view showing one embodiment of the lid according to Modification 2 of the first embodiment. [Figure 4] Figures 4A and 4B are plan views showing another embodiment of the lid according to the first embodiment. [Figure 5]Figure 5A is a plan view showing one embodiment of the lid according to the third embodiment. Figure 5B is a schematic cross-sectional view showing the state of the longitudinal section along line BB in Figure 5A. [Figure 6] Figure 6A is a plan view showing one embodiment of the lid according to the fourth embodiment. Figure 6B is a schematic cross-sectional view showing the state of the longitudinal section along line CC in Figure 6A. [Figure 7] Figure 7A is a plan view showing one embodiment of the lid according to the second embodiment. Figure 7B is a schematic cross-sectional view showing the state of the longitudinal section along line DD in Figure 7A. [Figure 8] Figure 8A is a plan view showing one embodiment of the lid according to Modification 1 of the second embodiment. Figure 8B is a schematic cross-sectional view showing the state of the longitudinal section along the EE line in Figure 8A. [Figure 9] Figure 9A is a plan view showing one embodiment of the lid according to Modification 3 of the second embodiment. Figure 9B is a schematic cross-sectional view showing the state of the longitudinal section along the FF line in Figure 9A. Figure 9C is a schematic cross-sectional view showing one embodiment of the retaining structure. [Figure 10] Figure 10 is a plan view showing another embodiment of the lid according to Modification 3 of the second embodiment. [Figure 11] Figures 11A and 11B are plan views showing another embodiment of the lid according to the third embodiment. Figure 11C is a schematic cross-sectional view showing the state of the longitudinal section along line GG in Figure 11B. [Figure 12] Figure 12A is a plan view showing one embodiment of the lid connection structure according to the third embodiment. Figure 12B is a schematic cross-sectional view showing the half-cut portion. [Figure 13] Figure 13A is a plan view showing one embodiment of the lid according to Modification 2 of the second embodiment. Figure 13B is a schematic cross-sectional view showing the state of the longitudinal section along line HH in Figure 13A. [Figure 14] Figure 14A is a plan view showing one embodiment of a container with a lid. Figure 14B is a schematic cross-sectional view showing the longitudinal section along line II in Figure 14A. [Figure 15]FIG. 15A is a perspective view showing an example of a lid according to the fifth embodiment. FIG. 15B is a sectional view schematically showing the state of the longitudinal section taken along line N-N of FIG. 15A. [Figure 16] FIG. 16A is a perspective view showing an example of a lid according to the sixth embodiment. FIG. 16B is a sectional view schematically showing the state of the longitudinal section taken along line J-J of FIG. 16A. [Figure 17] FIG. 17A is a perspective view showing an example of a lid according to the seventh embodiment. FIG. 17B is a sectional view schematically showing the state of the longitudinal section taken along line K-K of FIG. 17A. [Figure 18] FIG. 18A is a plan view showing an example of a lid according to Modification 1 of the fifth embodiment. FIG. 18B is a sectional view schematically showing the state of the longitudinal section taken along line L-L of FIG. 18A8. [Figure 19] FIGS. 19A and 19B are plan views showing an example of a blank material of a lid according to Modification 1 of the fifth embodiment. [Figure 20] FIG. 20A is a plan view showing an example of a lid according to Modification 4 of the fifth embodiment. FIG. 20B is a sectional view schematically showing the state of the longitudinal section taken along line M-M of FIG. 20A. [Figure 21] FIG. 21 is a sectional view showing an example of a container with a lid.

MODE FOR CARRYING OUT THE INVENTION

[0014] The lid according to the present invention will be described in detail below with reference to the drawings. While the lid according to the present invention will be described using a lid for various beverage containers (cups), such as coffee cups, as an example, it is not limited to lids for beverage containers and can also be applied to lids for containers holding food items other than beverages. Furthermore, the lid according to the present invention can be applied to containers that can hold various items other than food and beverages, such as bolts and nuts, or other items not mentioned above. In addition, while the lid according to the present invention will be described below using an example where the shape is circular when viewed from above, the shape of the lid is not limited to a circular shape when viewed from above and can be applied to various shapes other than circular, such as elliptical, rectangular, triangular, chamfered rectangular, chamfered polygonal, etc.

[0015] Hereinafter, the first, second, third, fourth, fifth, sixth, seventh, and eighth embodiments and application examples related to the present invention will be described sequentially 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 explanations will be omitted.

[0016] The following description is a preferred example of the present invention, and the content of the present invention is not limited to these embodiments. Furthermore, in the following description, for the sake of convenience of explanation, directions such as front / back, left / right, up / down, and horizontal plane directions are indicated, but the content of the present invention is not limited to these directions. In the examples of Figures 1 to 21, the Z-axis direction is assumed to be the up / down direction (upper side is the +Z direction, lower side is the -Z direction), and the X-axis direction is assumed to be the front / back direction (rear side is the +X direction, front side is the -X direction). The directions along the mutually orthogonal X and Y axes defined on a plane normalized to the Z-axis direction are defined as the X-axis direction and Y-axis direction, and the XY plane, which is the plane drawn between the X and Y axes, is assumed to be the horizontal plane. The explanation will be based on these assumptions. The relative size ratios shown in Figures 1 to 21 are for convenience only and do not limit the actual size ratios unless specifically stated.

[0017] [1 First Embodiment] [1-1 Structure] The lid 1 according to the first embodiment is formed to be in contact with a container 101 having an opening 102 formed at its upper end and an edge portion 103 that forms the outer circumference of the opening 102, as will be described later using Figures 14A, 14B, etc. Regarding the state of contact between the lid 1 and the container, the lid 1 is formed to be joinable to a container 101 having an opening 102 formed at its upper end (an opening 102 composed of a portion surrounded by the edge portion 103) and an edge portion 103 that forms the outer circumference of the opening 102. Figures 14A and 14B are perspective and cross-sectional views showing an example of a container with a lid 150 in which the lid 1 shown in Figures 1A, 1B, and 1C is joined to a container 101. The lid 1 can be used by being joined along the edge portion 103. In the lid 1, the region joined to the edge portion 103 in a plan view of the lid 1 is called the joining region R. Figure 1A is a plan view showing one embodiment of the lid 1. Figure 1B is a schematic cross-sectional view showing the longitudinal section along line AA in Figure 1A. Figure 1C is a magnified view of a part of the circumferential surface 11 of the through-hole 10, which will be described later. It is preferable to use a container 101 that has flexibility at the edge 103 of the opening 102. However, this does not prohibit the container 101 from being a metal container or other container with little or no flexibility.

[0018] In the example shown in Figure 1A, the joining region R corresponds to a region that is roughly annular in shape along the opening 102 of the container 101, corresponding to the shape of the opening 102.

[0019] (Blank material) The lid 1 is formed from a blank material 30. The blank material 30 is obtained by processing a sheet material made of a material corresponding to the material of the lid 1 into a shape corresponding to the shape of the lid 1. It should be noted that the statement that the lid 1 is formed from a blank material 30 is not limited to cases where the lid 1 is formed solely from the blank material 30, but also includes cases where the lid 1 has a structure in which members such as tab members 22 are attached to the blank material 30, and also includes cases where the lid 1 is subjected to various processing treatments such as shaping treatment (embossing treatment, etc.) on the blank material 30.

[0020] (Material of the blank material) The blank material 30 is formed from a sheet material having a fiber sheet 31 containing fibers including a paper-based material and a resin material 32. In the example of the lid 1 according to the first embodiment shown in Figure 1A, as shown in Figure 1C, the sheet material forming the blank material 30 has a structure in which the resin material 32 is attached to at least some of the fibers 31A that form the interior of the fiber sheet 31. The blank material 30, similar to the sheet material, has a structure in which the resin material 32 is contained in at least some of the fibers 31A that form the interior of the fiber sheet 31.

[0021] (Fiber sheets containing paper-based materials) Examples of paper-based materials and fiber sheets 31 include so-called paper obtained by forming a sheet from a slurry of fiber raw materials on a mesh, drying or press-drying it, and papermaking, as well as so-called airlaid sheets obtained by stacking opened fiber raw materials such as pulverized pulp obtained by crushing a raw material sheet made of pulp fibers in a crusher, stacking the fibers of the stacked material with an airflow, and fixing the fibers of the stacked material with a binder, as well as so-called paper products manufactured by bonding plant fibers and other fibers. Furthermore, fiber sheets containing paper-based materials include those having a laminated structure in which multiple sheets of the above-mentioned paper products are stacked. In addition, fiber sheets 31 include sheet materials having fibers other than pulp, such as chemical fibers, fibers with functions such as water resistance, metal fibers, and glass fibers, in addition to paper-based materials.

[0022] The fiber sheet 31 may consist only of fibers 31A (only the entangled structure of fibers 31A), or it may have a structure in which multiple fibers 31A are crosslinked with a crosslinking agent, and may also contain other additives other than the resin material described later. In the fiber sheet 31, the crosslinking of multiple fibers 31A with a crosslinking agent stabilizes the shape of the fiber sheet 31 and makes it difficult for a defibrated state to form.

[0023] (fiber) The fibers 31A constituting the fiber sheet 31 may consist of a single unit fiber, or they may have a structure in which multiple unit fibers are intertwined, and fibers having either structure may be included in the fiber sheet 31. Preferably, the fiber sheet 31 is formed in a state in which multiple fibers having such structures are further intertwined.

[0024] (Paper-based materials) As for paper-based materials, in addition to those consisting solely of pulp, they may also contain non-pulp-based natural fibers, synthetic fibers, recycled fibers, etc. However, it is preferable that they contain 50% by mass or more of pulp, more preferably 70% by mass or more, and even more preferably 80% by mass or more, but particularly preferable that they consist of 100% by mass of pulp. Paper-based materials can also be composite materials with nonwoven fabrics, wood-based materials such as wood foil, and even aluminum foil. In the case of composite materials, it is preferable that the composite material as a whole contains 50% by mass or more of pulp, and particularly preferable that it contains 80% by mass or more of pulp. A higher pulp content is preferable because it makes the paper-based material more biodegradable.

[0025] (Resin materials) The resin material 32 attached to the fiber 31A is not particularly limited, and examples include synthetic resins and natural resins. Examples of synthetic resins include olefin resins such as polyethylene (PE) and polypropylene (PP), styrene resins such as polystyrene (PS), acrylic resins such as polyacrylate and polymethacrylate, vinyl resins such as polyvinyl chloride (PVC) and polyvinyl acetate, polyamide resins, polyimide resins, polyester resins such as polyethylene terephthalate (PET), fluororesins, polycarbonate resins (PC), polyether resins such as polyetheretherketone (PEEK) and polyethersulfone (PES), as well as phenolic resins, urea resins, melamine resins, epoxy resins, urethane resins, silicone resins, polyacetal resins, polysulfone resins, polyetherimide resins, thermosetting resins such as polybutylene terephthalate (PBT), and synthetic polymers such as polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer resin (EVA), polyvinyl alcohol derivatives, and polymers or copolymers of unsaturated carboxylic acids or their salts.

[0026] The resin material 32 is preferably a biodegradable resin, which poses fewer environmental pollution problems among various resins. Examples of biodegradable resins include: microbially produced biodegradable resins such as polyhydroxyalkanoates (PHA) and PHA copolymers; natural product biodegradable resins such as cellulose derivatives such as cellulose acetate and starch-based resins mainly made from starch such as corn starch; lactic acid-based resins such as polylactic acid (PLA), polylactic acid / polycaprolactone copolymers, and polylactic acid / polyether copolymers; succinate-based resins such as polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyethylene terephthalate succinate (PETS); polycaprolactone; and polyvinyl alcohol (P Examples include chemically synthesized biodegradable resins such as VA, polysaccharide derivatives such as carboxymethylcellulose (CMC), carboxyethylcellulose, carboxymethylated starch or its salts, starch, methylcellulose, ethylcellulose, nitrocellulose, cellulose acetate and other cellulosic resins, natural polysaccharides such as guar gum, tranto gum, xanthan gum, sodium alginate, carrageenan, acacia gum, gelatin, casein, and others, as well as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product name: Biorecover, trade name: Cra Drop, etc.).

[0027] (Adhesion structure of resin materials) At least a portion of the resin material 32 is attached to at least a portion of the fibers 31A that form the interior of the fiber sheet 31. When the resin material 32 is attached to the fibers 31A, this includes cases where the resin material 32 is attached to the surface of the fibers 31A or where the resin material 32 is impregnated into the interior of the fibers 31A. Furthermore, if the fibers 31A constituting the fiber sheet 31 include, in addition to pulp, non-pulp natural fibers, synthetic fibers, regenerated fibers, etc., at least a portion of the resin material 32 will be attached to the fibers 31A that are made of pulp. In other words, in the lid 1, it is preferable that at least a portion of the resin material 32 is attached to the fibers 31A that are made of pulp. However, this does not prohibit at least a portion of the resin material 32 from being attached to non-pulp natural fibers, synthetic fibers, regenerated fibers, etc. among the fibers 31A.

[0028] Furthermore, the resin material 32 may fill at least a portion of the spaces (gap spaces) formed between the fibers 31A that constitute the fiber sheet 31 (i.e., a state in which the resin material 32 is impregnated between at least a portion of the fibers 31A) and the gap spaces may be largely occupied by the resin material 32.

[0029] The lid 1 has a joint area corresponding portion 5A and a lid area corresponding portion 5B.

[0030] (Joining area corresponding part) The joint area corresponding portion 5A is the part of the lid 1 that corresponds to the area along the edge 103 of the container 101 that is joined to the container 101. In other words, the joint area corresponding portion 5A is the part of the lid 1 that corresponds to the joint area R (the area facing the edge 103 of the container 101 and the area that is joined to the container 101). In a container with a lid 150, the joint area corresponding portion 5A is the part of the lid 1 that forms the joint portion 151 between the lid 1 and the container 101. Specifically, in a plan view of the lid 1 (in the example of Figure 1A, the Z-axis direction (up and down direction) is the line of sight), the part that forms the joint area R is defined as the joint area corresponding portion 5A. The joint area corresponding portion 5A is usually formed in an annular shape, as shown in Figure 1A. In particular, as shown in Figure 1A, when the edge 103 of the container 101 is formed in a roughly annular shape, the joint area R becomes annular, and the joint area corresponding portion 5A also becomes roughly annular in a plan view of the lid 1. The outer edge of the joint area corresponding portion 5A is determined according to the position of the outer edge of the joint area R. The outer edge of the joint area corresponding portion 5A may be located on the outer peripheral edge of the lid 1, or it may be located inside the outer peripheral edge of the lid 1, as shown in the example in Figure 1A. If the joint area R between the lid 1 and the container 101 is not formed continuously, the portion sandwiched between adjacent joint areas R and facing the edge portion 103 will also be included in the joint area corresponding portion 5A, as described later.

[0031] In the lid 1 shown in the example in Figure 1A, the resin material 32 is attached to at least some of the fibers 31A that form the interior of the fiber sheet 31 in the portion corresponding to the joining area 5A.

[0032] (Cover area corresponding section) The lid area corresponding portion 5B is the portion of the lid 1 that is inward from the joining area corresponding portion 5A. That is, the lid area corresponding portion 5B is the portion inward from the inner edge of the joining area corresponding portion 5A, and the outer edge of the lid area corresponding portion 5B is common to the inner edge of the joining area corresponding portion 5A. The lid area corresponding portion 5B is the portion that covers the opening 102 in the container with a lid 150. The portion that covers the opening 102 is the portion that covers at least a part of the opening 102, and includes cases where a window portion is formed in part, as will be explained in the third embodiment, and cases where there is a small opening, as will be explained in the second embodiment, etc. As shown in the example in Figure 1, the portion of the lid 1 that is outward from the outer edge of the lid area corresponding portion 5B is referred to as the lid area non-formed portion 5C (in the second embodiment described later, the lid area non-formed portion 5C corresponds to the portion of the base portion 2 that is outward from the inner edge of the joining area corresponding portion 5A).

[0033] (Through section) In the lid 1, it is preferable that a through portion 10 is formed in at least the lid area corresponding portion 5B. The through portion 10 has a structure (a through-structure) that is cut in the vertical direction (thickness direction, Z-axis direction) from one side to the other side of the blank material 30, and is a so-called notched portion 8. The through portion 10 has a circumferential portion 11 and an end portion 12. The circumferential portion 11 extends in the longitudinal direction of the through portion 10, and the end portion 12 is formed at the notched end.

[0034] If a through-hole 10 is formed in the lid 1, the through-hole 10 can function as a gas vent. Here, a gas vent refers to a part of the lid 1 that allows gas to pass from one side to the other side (from the opposing surface 73 to the exposed surface 72). In addition to functioning as a gas vent, the through-hole 10 may also have other functions. For example, when the lid 1 is used in a container with a lid 150, the through-hole 10 may function as an insertion opening 19 or a part that constitutes an insertion opening 19 into which a member is inserted from the outside of the container with a lid 150 toward the inside of the container 101 (space 105). In the example in Figure 1A, an example is shown in which the lid 1 has a through-hole 10 and the through-hole 10 is formed to function as an insertion opening 19. For example, a straw or the like can be used as a member that can be inserted through the insertion opening 19. As mentioned above, the through-hole 10 shown in the example in Figure 1A can also function as a gas vent.

[0035] (Shape of the through-hole) The shape of the through-hole 10 is not particularly limited as long as it is a shape that can be formed by cutting. For example, in the example shown in Figure 1A, the lid 1 has a cut portion 8 formed in the shape of a cross cut in the vertical direction of the blank material 30, and this cut portion 8 forms the through-hole 10. As described above, the through-hole 10 also serves as the insertion opening 19. This is just one example, and the shape of the cut portion 8 forming the through-hole 10 is not limited to a cross shape as long as it is a shape that can be used as the insertion opening 19. It may be a C shape as illustrated in Figures 4A and 4B, or various other shapes such as a tongue shape may be used. Figures 4A and 4B are schematic plan views showing another embodiment in which the lid 1 has an insertion opening 19 as the through-hole 10.

[0036] (Circumferential surface of the through-hole) In the cover 1, as shown in Figure 1C, the cross-section of the fiber sheet 31 is exposed in the region forming the circumferential surface 11 of the through-hole 10 (the region of the circumferential surface 11). At this time, at least a portion of the resin material 32 is exposed on the circumferential surface 11, that is, on at least a part of the cross-section of the fiber sheet 31. Exposure of at least a portion of the resin material 32 to the circumferential surface 11 can refer to cases where a portion of the resin material 32 faces a part of the region of the circumferential surface 11 (the region of the cross-section of the fiber sheet 31), or where a portion of the resin material 32 faces the entire region of the circumferential surface 11 (the entire region of the cross-section of the fiber sheet 31). In the example in Figure 1C, the case in which at least a portion of the cross-section of the fibers 31A is exposed on the circumferential surface 11 is illustrated. However, this does not prohibit cases where at least a portion of the cross-section of the fibers 31A is not exposed on the circumferential surface 11, nor does it prohibit cases where the side surfaces of the fibers 31A are exposed.

[0037] (slanted part) If a through-hole 10 is formed in the lid 1, it is preferable that an inclined portion 13 is formed in the area from around the through-hole 10 to the through-hole 10. The inclined portion 13 is defined as the portion that slopes upward in the direction away from the circumferential surface 11 of the through-hole 10, with the circumferential surface 11 being the end 13A. The inclined portion 13 may be formed only on one side of the lid 1, as shown in Figures 1B and 2A, or it may be formed on both sides of the lid 1 (the exposed surface 72 (non-facing surface) and the surface facing the space 105 of the container 101 (facing surface 73)), as shown in Figure 2B. In Figure 1B, the inclined portion 13 has an inclined surface on the exposed surface 72 side of the lid 1, and in Figure 2A, the inclined portion 13 has an inclined surface on the facing surface 73 side of the lid 1.

[0038] (Fiber density in the inclined section) In the lid 1, it is preferable that the density of the fibers 31A constituting the fiber sheet 31 in the inclined portion 13 is higher closer to the end of the inclined portion. For example, as shown in Figures 1B, 2A, and 2B, when a position P1 close to the end 13A of the inclined portion 13 and a position P2 further from the end 13A than position P1 are selected, it is preferable that the density of the fibers 31A at position P1 is higher than the density of the fibers 31A at position P2. Such a structure can be achieved by applying stronger pressure closer to the circumferential surface 11 of the through portion 10 when forming the through portion 10. In this case, as shown in Figures 1B, 2A, and 2B, the inclined portion 13 is formed in a shape that slopes downward toward the through portion 10. The configuration of the inclined portion and the density of the fibers in the inclined portion is the same in the through portion formed in the second to fourth embodiments described later.

[0039] [1-2 Manufacturing method] The lid 1 according to the first embodiment can be manufactured, for example, as follows: A fiber sheet 31, which is a raw material sheet formed from a material corresponding to the material of the lid 1, is immersed in an immersion liquid (immersion step). The immersion liquid is a liquid containing a resin material 32 (resin-containing liquid). In the example described here, for example, the resin-containing liquid is a mixture of the resin material 32, water, and a non-aqueous solvent. The resin material 32, when incorporated into the lid 1, can increase the possibility of improving the waterproofness of the lid 1. After the immersion step, a drying step is performed on the fiber sheet 31 that has undergone the immersion step (fiber sheet 31 containing the immersion liquid). The fiber sheet 31 that has undergone the drying step (fiber sheet 31 with the resin material 32 attached) is processed into a shape corresponding to the shape of the lid 1 to form a blank material 30. The blank material 30 may be used as is as the lid 1. In the example of Figure 1A, a notch 8 is formed in the blank material 30 to form a through-hole 10, thereby forming the lid 1.

[0040] In the manufacturing method described above, the resin material 32 contained in the immersion liquid can be exemplified by acrylic resins, polyolefin resins, etc., but it is preferable that it be a biodegradable resin. The non-aqueous solvent is not particularly limited as long as it can mix with the resin material, and examples include alcohol-based solvents such as ethanol.

[0041] In the drying process, the water and non-aqueous solvent contained in the fiber sheet 31 containing the immersion liquid may be almost completely evaporated, or some moisture and non-aqueous solvent may remain in the fiber sheet 31.

[0042] [1-3 Actions and Effects] Previously, when the lid was made of a paper-based material, there was a risk that moisture could penetrate into the fibers constituting the paper-based material forming the lid, significantly impairing the lid's rigidity and reducing its strength. In this regard, it is conceivable to form a resin layer on both sides of the lid (exposed side and opposing side) to suppress moisture penetration. However, there is a risk that the adhesion will be significantly reduced when bonding the container and lid using a sealing method. In other words, generally, the surface of containers that contain moisture, such as beverages and prepared foods, is often coated with a resin layer for waterproofing. The material of the resin material forming the resin coating layer must be selected appropriately according to the contents contained in the container, so diversity is required for the resin material used to form the resin coating layer. Therefore, if a resin layer is formed on the surface of the lid, depending on the material of the resin material constituting that resin layer, the adhesion with the resin constituting the resin coating layer may be impaired, making it difficult to bond the container and lid using a sealing method. Therefore, there is room for improvement in enabling the container and lid to be bonded together using a sealing method, even if the types of resins constituting the resin coating layer formed on the surface of the container are diverse.

[0043] In contrast, according to the lid 1 of the first embodiment, at least a portion of the resin material 32 is attached to at least a portion of the fibers 31A that form the interior of the fiber sheet 31 constituting the lid 1, so that the resin material 32 can suppress the penetration of moisture into the fibers 31A. Furthermore, when the sealing method is applied when attaching the lid 1 to the container 101, a space may exist in at least a portion of the space between the fibers 31A constituting the fiber sheet 31, so that the resin constituting the resin coating layer formed on the surface of the edge 103 of the container 101 can enter that space, making it easier to form an adhesive state between the resin coating layer and the lid 1. In other words, even if the resin material forming the resin coating layer has poor adhesion to the resin material 32, it may be easy to bond the container 101 and the lid 1 using the sealing method. Next, a modified example of the first embodiment will be described.

[0044] [1-4 Variations] (Variation 1) In the lid 1 according to the first embodiment, if a through portion 10 is formed in the lid 1, the through portion 10 may form a part of the weakened portion 14, as shown in Figure 3A. This embodiment will be referred to as Modification 1 of the first embodiment. Figure 3A is a schematic plan view showing one embodiment of the lid 1 according to Modification 1 of the first embodiment.

[0045] (Weakening part) As shown in the example in Figure 3A, the weakened portion 14 has a plurality of through-holes 10 and at least one continuous portion 15 formed between the ends 12 of at least two of the through-holes 10. The weakened portion 14 guides the position where a division occurs (the division position) when an upward or downward force is applied to the weakened portion 14, forming a divided portion in the lid. That is, the position where the division occurs is formed roughly along the weakened portion. For example, in the example in Figure 3A, when a downward force is applied from the exposed surface 72 side to the opposing surface 73 side to the portion corresponding to the insertion opening 19, the continuous portion 15 is destroyed, a division occurs along the through-hole 10 with the continuous portion 15 as the end 12, and the insertion opening 19 is formed (the insertion opening 19 becomes open).

[0046] (Layout of vulnerable areas) The layout of the weakened portion 14 is not particularly limited and may be determined according to conditions such as the function of the weakened portion 14. In the example of the weakened portion 14 shown in Figure 3A, a continuous portion 15 is formed in one place, and a total of four through portions 10 are formed. In this example, the through portions 10 are formed to extend radially in four different directions from the continuous portion 15. This is just one example of the weakened portion 14, and when the weakened portion 14 has multiple through portions 10 formed radially around the continuous portion 15, the through portions 10 may extend in three directions away from the continuous portion 15, or in five or more directions. Also, the through portions 10 may extend in two directions away from the continuous portion 15.

[0047] Furthermore, although the weakened portion 14 is formed in a cross shape in the example of Figure 3A, it may also be formed in a C shape as shown in Figure 4B. Also, as shown in this example, the formation location of the continuous portion 15 is not limited to one place, but may be formed in multiple places. In the example of Figure 4B, continuous portions 15 are formed in three places, and through portions 10 (a total of four through portions 10) are formed in two directions from each continuous portion 15. The multiple through portions 10 are formed by curved cut portions 8 so that the weakened portion 14 as a whole takes on a shape that roughly resembles the letter C.

[0048] The location of the weakened portion 14 is not particularly limited, but it is preferably located in the lid region corresponding portion 5B. In this case, a division point will be formed in the lid region corresponding portion 5B.

[0049] (Continuous section) The continuous portion 15 is any portion formed in such a way that it does not penetrate the blank material 30 that forms the lid 1. It may be an uncut portion, or, as shown in Figure 12B, a half-cut portion 16 in which the blank material 30 is cut in the thickness direction to the extent that it does not penetrate the blank material 30. Figure 12B is a diagram illustrating one embodiment of the half-cut portion 16. The half-cut portion 16 is defined as a portion that forms a half-cut structure in which the lid 1 is cut partway in the thickness direction of the lid 1. Note that the half-cut portion 16 is not limited to a portion that is cut to half the thickness of the lid 1 in the thickness direction of the lid 1. The half-cut portion 16 includes a structure in which more than half the thickness of the lid 1 is cut while avoiding penetrating the lid 1, and a structure in which less than half the thickness of the lid 1 is cut in the thickness direction of the lid 1.

[0050] (Modification 2) In the lid 1 according to the first embodiment, an extension may be formed as shown in Figure 3B. This embodiment will be referred to as Modification 2 of the first embodiment. Figure 3B is a schematic plan view showing one embodiment of the lid 1 according to Modification 2 of the first embodiment.

[0051] (extending part) In the lid 1 according to the modified example 2 of the first embodiment, the position and shape of the extension portion 7 are not particularly limited. However, in the example shown in Figure 1A, the extension portion 7 is formed on the outer peripheral edge 50 of the non-formed portion 5C of the lid area of ​​the lid 1 (corresponding to the outer peripheral edge 2A of the base portion 2 in the second embodiment described later), and the shape of the extension portion 7 is determined such that the outer peripheral edge 7A of the extension portion 7 is a convex, gently curved mountain shape.

[0052] If an extension portion 7 is formed, a mark or letter indicating the container 101 corresponding to the lid 1 can be placed on the extension portion 7. For example, letters such as S, M, and L can be printed on the extension portion 7. Then, the type of container 101 and the type of lid 1 are associated, such as using a lid 1 with the letter S printed on it when the container 101 is small, using a lid 1 with the letter M printed on it when the container 101 is medium, and using a lid 1 with the letter L printed on it when the container 101 is large. This reduces the risk of incorrectly joining the container 101 and the lid 1 in different sizes when joining them to the container 101.

[0053] Furthermore, if an extension portion 7 is formed on the lid 1, the extension portion 7 can be used as a handle.

[0054] [2 Second Embodiment] In the first embodiment described above, the case in which the through portion 10 forms an insertion opening 19 was explained as an example. The lid 1 is not limited to this, and the through portion 10 may form at least a part of the boundary between the opening edge of the small opening and the outer peripheral edge of the small lid, as shown in Figures 7A and 7B. That is, the lid 1 may include a base portion having a small opening with an opening area smaller than the opening 102 of the container 101, a small lid portion that opens and closes the small opening, and a hinge portion that connects the base portion and the small lid portion, as shown in Figures 7A and 7B. An embodiment having such a configuration will be referred to as the second embodiment. Figure 7A is a plan view showing one embodiment of the lid 1 according to the second embodiment. Figure 7B is a schematic cross-sectional view showing the state of the longitudinal section along line DD in Figure 7A. The second embodiment may be the same as the first embodiment in other respects, such as the through portion 10 forming at least a part of the boundary between the opening edge of the small opening and the outer peripheral edge of the small lid. Furthermore, in the second embodiment, the insertion opening 19 shown in the first embodiment may be further formed.

[0055] [2-1 Structure] The lid 1 according to the second embodiment has a base portion 2, a small lid portion 3, and a hinge portion 4, as shown in Figures 7A and 7B. In the example of Figures 7A and 7B, the lid area corresponding portion 5B of the lid 1 has a base portion 2, a small lid portion 3, and a hinge portion 4, and the non-lid area portion 5C has a base portion 2.

[0056] (Base section) The base portion 2 is defined as having a joint area corresponding portion 5A and forming a small opening 6. The base portion 2 can also be the portion that defines the reference for the displacement of the small cover portion 3, which will be described later. In the example of Figure 7A, in a plan view of the cover 1, the base portion 2 and the small cover portion 3 form the exposed surface 72 of the cover 1. In the second embodiment, in a plan view of the cover 1 (in the example of Figure 7A, the Z-axis direction (vertical direction) is the line of sight), the joint area corresponding portion 5A corresponds to the portion that forms the joint area R and is formed in the base portion 2.

[0057] (Small opening) The small opening 6 is formed to penetrate the surface 73 of the lid 1 facing the container 101 and the non-facing surface of the lid 1 (the exposed surface 72 of the lid 1) facing the container 101. In a plan view of the lid 1, the small opening 6 is formed on the inside of the portion corresponding to the joining area 5A, with an opening area smaller than the opening 102 of the container 101. The small opening 6 is intended to create an opening for the contents (e.g., beverages or food) in the space 105 of the container 101 to enter and exit when the lid 1 is joined to the container 101. The small opening 6, in combination with the small lid portion 3 described later, forms an opening forming portion 20.

[0058] (Aperture forming part) As shown in Figure 7A, the opening forming section 20 is defined as a part having a small opening 6 and a small lid 3. In the opening forming section 20, the small opening 6 opens and closes as the small lid 3 is displaced. The opening forming section 20 is formed so that, as shown in Figure 7A, the small lid 3 closes the small opening 6, and the small opening 6 is open when the small lid 3 is displaced. When the small lid 3 is rotated so as to be pulled up with the base section 2 as the reference, the small opening 6 is exposed and becomes an exposed opening. In other words, the opening forming section 20 is designed so that when the lid 1 is attached to the container 101 and the small lid 3 is pulled up, the space 105 of the container 101 can be seen through the small opening 6.

[0059] Furthermore, when the small opening 6 is exposed, it can be used as a supply port for additional liquids such as beverages or solids such as ice, as will be described later. Also, when there is liquid such as a beverage inside the container 101 (space 105), the small opening 6 may be used as a drinking spout or pouring spout for the beverage.

[0060] (Small lid section) The lid 1 is provided with a small lid portion 3. The small lid portion 3 is formed to cover the small opening 6 in an openable and closable manner. In the example shown in Figure 7A, the small lid portion 3 is formed to be displaced in an uplifted state relative to the base portion 2, as will be described later using Figure 9C, and the small opening 6 is formed (opened) when the small lid portion 3 is lifted up. In the example shown in Figure 7A, the shape of the small lid portion 3 can be determined so that when the small opening 6 is closed with the small lid portion 3, the outer contour shape of the small lid portion 3 follows the shape of the opening edge 6A of the small opening 6. In this case, when the small opening 6 is closed with the small lid portion 3, it becomes easy to bring the end face of the outer edge 3A of the small lid portion 3 into contact with the end face of the opening edge 6A of the small opening 6.

[0061] In the lid 1 shown in the example in Figure 7A, the small lid portion 3 is located inside the joint area corresponding portion 5A (towards the lid area corresponding portion 5B) (towards the center CT) in a plan view of the lid 1. The small lid portion 3 is displaced (rotated) so that it is in a lifted state. The small lid portion 3 is connected to the base portion 2 by a hinge portion 4. As the small lid portion 3 is lifted using the hinge portion 4 as a pivot, the small opening 6 is exposed.

[0062] In the lid 1, when the small lid portion 3 is raised, the small opening 6 is exposed as described above. This state is called the open lid state. The state in which the small opening 6 is covered by the small lid portion 3 is called the closed lid state.

[0063] In the lid 1, even after it is in the open state (after the small lid portion 3 is raised and the small opening 6 is exposed), it is possible to close it again, and when it is in the closed state, the end face (outer peripheral end face) of the outer peripheral edge 3A of the small lid portion 3 can face the end face 6A of the opening edge 6 of the small opening 6 of the base portion 2.

[0064] (Hinge section) As described above, the lid 1 has a hinge portion 4. The hinge portion 4 is generally composed of a portion corresponding to a line segment connecting two base ends 74 along the outer peripheral edge 3A of the small lid portion 3, and corresponds to the boundary portion between the base portion 2 and the small lid portion 3. The hinge portion 4 is the pivot axis when the small lid portion 3 rotates. However, when the small lid portion 3 rotates, this includes not only the case where the small lid portion 3 rises from the base portion 2 at a certain angle at the position of the hinge portion 4, but also the case where the small lid portion 3 gradually curves upward from the hinge portion 4 toward the front end edge 75 of the small lid portion 3.

[0065] The base portion 2 is connected to the small cover portion 3 by at least the hinge portion 4. The hinge portion 4 is not particularly limited in structure as long as it is the part defined as the boundary between the base portion 2 and the small cover portion 3. The hinge portion 4 may be a perforated structure or a half-cut portion, similar to the connection structure 17 described later.

[0066] (The boundary between the outer edge of the small cover and the opening edge of the small opening) At the boundary between the outer peripheral edge 3A of the small cover portion 3 and the opening edge 6A of the small opening 6, the small cover portion 3 and the small opening 6 may be separated (disconnected), or a connecting structure 17 may be formed as described later. If the small cover portion 3 and the small opening 6 are disconnected at the boundary between the outer peripheral edge 3A of the small cover portion 3 and the opening edge 6A of the small opening 6, a through portion 10 is formed as a structural part that separates the outer peripheral edge 3A of the small cover portion 3 and the opening edge 6A of the small opening 6, as shown in Figure 7B. The circumferential surface portion 11 of the through portion 10 forms the end face of the outer peripheral edge 3A of the small cover portion 3 and the end face of the opening edge 6A of the small opening 6. The end portion 12 of the through portion 10 is located at the base end portion 74 of the hinge portion 4. The structure of the through portion 10 is the same as that described in the first embodiment, so its description is omitted.

[0067] (Connection structure between the base and the small lid) In the lid 1, at the boundary between the outer peripheral edge 3A of the small lid portion 3 and the opening edge 6A of the small opening 6, a structure (connecting structure 17) may be formed, as described above, where the opening edge 6A of the small opening 6 of the base portion 2 and the outer peripheral edge 3A of the small lid portion 3 are connected. Preferably, the connecting structure 17 is configured as a weakened portion 14, which is a weaker part than the small lid portion 3, as shown in Figure 12A. Figure 12A shows one embodiment in which the connecting structure 17 is a weakened portion 14. Because the connecting structure 17 is a weakened portion 14, when the small lid portion 3 rotates relative to the base portion 2 around the hinge portion 4 as an axis, the weakened portion 14 can be destroyed (the continuous portion 15 can be destroyed). In addition, the small lid portion 3 is raised relative to the base portion 2 while being separated from the base portion 2 roughly along the connecting structure 17.

[0068] (Weakening part) The weakened portion 14 is formed by a combination of a through portion 10 and a continuous portion 15, as described in Modification 1 of the first embodiment. Therefore, when the connecting structure 17 is the weakened portion 14, at the boundary between the outer peripheral edge 3A of the small cover portion 3 and the opening edge 6A of the small opening 6, it is formed by a combination of a through portion 10 and a continuous portion 15. In the example of Figure 12A, the combination structure is such that the combination structures of the continuous portion 15 and the through portion 10 are alternately arranged along the longitudinal direction of the portion where the end face of the opening edge 6A of the small opening 6 and the end face of the outer peripheral edge 3A of the small cover portion 3 face each other (a so-called perforated structure).

[0069] The connection structure 17 is not limited to a perforated structure; for example, as shown in Figure 12B, the entire connection structure 17 may be formed as a half-cut portion 16. The half-cut portion 16 is the same as the half-cut portion 16 described in the first embodiment using Figure 12B, so its description is omitted.

[0070] Furthermore, if the connection structure 17 has a continuous portion 15 and a through portion 10, the continuous portion 15 may be a half-cut portion 16, as shown in Figure 12B.

[0071] In the case where a through portion 10 is formed in the lid 1 according to the second embodiment, the through portion 10 may be formed as a gas vent at a position different from the boundary position between the outer peripheral edge of the small lid portion and the opening edge of the small opening. For example, if a connecting structure 17 is formed at the boundary position between the outer peripheral edge of the small lid portion and the opening edge of the small opening, and the entire connecting structure 17 is formed as a half-cut portion 16, the through portion 10 may be formed with a different configuration from the connecting structure 17.

[0072] Furthermore, the through-hole 10 may be formed at the boundary position between the outer peripheral edge of the small lid and the opening edge of the small opening, and at a position different from the boundary position. Thus, in the lid 1 according to the second embodiment, at least a portion of the through-hole may be formed at the boundary position between the outer peripheral edge of the small lid and the opening edge of the small opening.

[0073] [2-2 Action and Effects] The lid 1 according to the second embodiment can obtain the same effects as the first embodiment.

[0074] Further explanation will be provided regarding a modified example of the second embodiment.

[0075] [2-3 Variations] (Variation 1) In the second embodiment, the lid 1 may be provided with a tab 21 on the small lid portion 3, as shown in Figures 8A and 8B. A lid 1 having such a configuration will be referred to as Modification 1 of the second embodiment. Figure 8A is a schematic plan view showing one embodiment of the lid 1 according to Modification 1 of the second embodiment. Figure 8B is a schematic cross-sectional view showing the state of the longitudinal section along the EE line in Figure 8A.

[0076] The lid 1 according to the modified example 1 of the second embodiment may be the same as that of the second embodiment described above, except for the configuration in which a knob 21 is provided on the small lid 3. Therefore, the description of the other components (base 2, hinge 4, etc.) other than the configuration in which a knob 21 is provided on the small lid 3 will be omitted.

[0077] (Pickling part) In the example of the second embodiment shown in Figures 8A and 8B, when the small opening 6 is closed with the small lid 3, a knob 21 is provided on the upper side of the small lid 3, which is the exposed surface (exposed surface 72 of the lid 1) side. The structure of the knob 21 is not particularly limited as long as it can rotate the small lid 3 around the hinge 4 as an axis, but in the example of Figures 8A and 8B, a tab member 22 is provided as the knob 21.

[0078] (Tab member) In the examples shown in Figures 8A and 8B, with the small opening 6 closed by the small lid 3, the tab member 22 has one end 22A joined to the small lid 3, and the other end 22B is a free end. The part of the tab member 22 joined to the small lid 3 is called the tab joint 23. Excluding the tab joint 23, the free end side of the tab member 22 (the other end 22B side) is not particularly limited in shape or structure, as long as it is formed to a size and shape that allows the tab member 22 to be grasped by a person's hand. The material of the tab member 22 may be the same as the material of the blank material 30 described in the first embodiment, and may be made of a paper-based material.

[0079] In the lid 1, there are no particular limitations on the mounting position or direction of the tab member 22 on the small lid portion 3. However, in the examples shown in Figures 8A and 8B, the tab member 22 is joined to the small lid portion 3 at a position closer to the tip of the small lid portion 3 (i.e., near the front edge portion 75).

[0080] Various methods can be used to join the tab member 22 to the small lid portion 3 (i.e., to form the tab joint portion 23), such as ultrasonic bonding, heat sealing, and bonding with adhesive. Of the above methods, ultrasonic bonding is preferred for forming the tab joint portion 23 from the viewpoint of ease of joining and the strength of the joint. The position where the tab joint portion 23 is formed on the small lid portion 3 is preferably offset from the center of the small lid portion 3, from the viewpoint of making it easy to raise the small lid portion 3 (rotate the small lid portion 3) by lifting the tab member 22.

[0081] (Orientation of the tab member (mounting direction)) In the cover 1, as shown in the example in Figure 8A, the other end 22B (free end) of the tab member 22 is positioned closer to the hinge portion 4 than the other end 22A of the tab member 22. However, this is just one example, and the orientation of the tab member 22 may be different from the orientation shown in Figure 8A. For example, the tab member 22 may be positioned so that the other end 22B is further away from the hinge portion 4 than the other end 22A of the tab member 22.

[0082] In the modified example 1 of the second embodiment, the lid 1 is provided with a tab 21, which allows the small lid 3 to be easily pulled up.

[0083] (Modification 2) In the modified lid 1 according to the second embodiment, as shown in examples such as Figures 13A and 13B, there may be a holding structure forming portion which is a portion that forms a holding structure that holds the small lid 3 in a state in which the small opening 6 is opened by rotating the small lid 3 relative to the base portion 2 with the hinge portion 4 as an axis. A lid 1 having such a configuration will be referred to as modified lid 1 according to the second embodiment. Figure 13A is a schematic plan view showing one embodiment of the lid 1 according to modified lid 1 according to the second embodiment. Figure 13B is a schematic cross-sectional view showing the state of the vertical section along line HH in Figure 13A.

[0084] (Holding structure forming part) The configuration of the retaining structure forming part is not particularly limited. For example, in the example of the lid 1 shown in Figures 13A and 13B, the claw portion 24 and the receiving portion 25 form the retaining structure forming part.

[0085] (Claw area) The claw portion 24 can be any part that has a structure that allows it to be locked to the receiving portion 25, which will be described later, by hooking or inserting, as shown in the example in Figure 13A. In the example in Figure 13A, the claw portion 24 is provided on the tab member 22, which is an example of the knob portion 21. In this example, the claw portion 24 is formed at a predetermined position on the tab member 22 by a notch formed in a contour shape such as a mountain shape.

[0086] (Receiving part) The receiving portion 25 is shaped to allow the claw portion 24 to engage or be inserted. In the example shown in Figure 13A, the receiving portion 25 is a slit formed by a cut in the base portion 2 at a predetermined position. In this case, the receiving portion 25 corresponds to the through portion 10. The receiving portion 25 is formed in a position where it can face the claw portion 24 when the tab member 22 is displaced to rotate the small cover portion 3.

[0087] (Formation of retaining structure) When raising the small lid portion 3 on the lid 1, the knob portion 21 is pulled up. At this time, the tab member 22 is pulled up and a predetermined portion of the free end side (other end 22B side) of the tab member 22 is bent so that the claw portion 24 protrudes downward or upward. Then, the tab member 22 is displaced so that the small lid portion 3 is rotated until the claw portion 24 of the small lid portion 3 reaches a position facing or near the receiving portion 25. Then, the claw portion 24 of the tab member 22 is hooked onto or inserted into the receiving portion 25. This forms a holding structure that holds the small lid portion 3 with the small opening 6 exposed.

[0088] In the above description, we described the case in which the holding structure forming part has a slit portion (through portion 10) formed as the receiving portion 25. However, as will be described later in Modification 3 of the second embodiment, the structure corresponding to the receiving portion 25 is not limited to a slit portion.

[0089] (Variation 3) The lid 1 according to the second embodiment may have an extension portion 7 formed on it, as shown in Figures 9A, 9B, etc., similar to Modification 2 of the first embodiment. This form will be referred to as Modification 3 of the second embodiment. Figure 9A is a schematic plan view showing one embodiment of the lid according to Modification 1 of the second embodiment. Figure 9B is a schematic cross-sectional view occupying the state of the longitudinal section along the FF line in Figure 9A. The configuration of the extension portion 7 in the lid 1 of the second embodiment is the same as in Modification 2 of the first embodiment, so its explanation will be omitted. Note that Figure 9A illustrates the case in which the extension portion 7 is formed in the lid 1 according to Modification 2 of the second embodiment.

[0090] In the example shown in Figure 9A, the extension portion 7 is positioned on the outer peripheral edge 2A of the base portion 2, such that the hinge portion 4 is located between the front edge 75 that forms the tip of the small lid portion 3 and the extension portion 7. In this case, the position of the front edge 75 of the small lid portion 3 and the position of the extension portion 7 can be made as far apart as possible. By making the position of the front edge 75 of the small lid portion 3 and the position of the extension portion 7 as far apart as possible, even if a person picks up the lid 1 by the extension portion 7 with their hand, the risk of the person picking up the lid 1 touching the small lid portion 3 of the lid 1 can be suppressed, and contamination of the small lid portion 3 by human contact can be suppressed.

[0091] In the modified 3 of the second embodiment, the extension may also perform the function of the receiving portion described in the modified 2 of the second embodiment.

[0092] (Holding structure forming part) The lid 1 shown in Figure 9A has a claw portion 24 formed on the gripping portion 21 (tab member 22 in Figures 13A and 9A), similar to the example in Figure 13A, and the claw portion 24 and the extension portion 7 form a retaining structure forming portion. In the example in Figure 9A, the extension portion 7 is formed so that when the tab member 22 is displaced to rotate the small lid portion 3, the outer edge 7A of the extension portion 7 can face the claw portion 24.

[0093] (Formation of retaining structure) In the lid 1 shown in the example in Figure 9A, similar to the example in Figure 13A, when raising the small lid portion 3, the tab member 22 is pulled up in the direction of arrow F1 in Figure 9B. In the example in Figure 9A, similar to the example in Figure 13A, the tab member 22 is pulled up and a predetermined portion of the free end side (other end 22B side) of the tab member 22 is bent, so that the claw portion 24 protrudes downward or upward. Then, the tab member 22 is displaced so that the small lid portion 3 is rotated until the claw portion 24 reaches a position facing or near the outer peripheral edge 7A of the extension portion 7. Then, as shown in Figure 9C, the claw portion 24 is hooked onto or inserted into the extension portion 7. This forms a holding structure that holds the small lid portion 3 with the small opening 6 as the exposed opening of the space portion 105. Figure 9C is a cross-sectional view illustrating one embodiment of the holding structure.

[0094] (Size of the extended portion) When the extension portion 7 functions as a receiving portion 25, as shown in Figure 10, the extension distance D1 of the extension portion 7 may be smaller than the distance D2 between the tip of the small opening 6 and the outer peripheral edge 2A of the base portion 2. Figure 10 is a plan view illustrating one embodiment of the extension portion 7. The extension distance D1 of the extension portion 7 represents the maximum distance from the outer peripheral edge 2A of the lid 1 to the outer peripheral edge 7A of the extension portion 7, along the direction away from the center CT of the lid 1 in the radial direction. In this case, if the tip of the small opening 6 (the front end edge 75 of the small lid portion 3) is to be formed close to the outer peripheral edge 2A of the lid 1, and the small opening 6 is to be used as a drinking spout, the size of the extension portion 7 can be reduced, making it less likely for the user to perceive the extension portion 7 as a tab for forming an opening. That is, it makes it less likely for the user to lift the extension portion 7 and tear the lid 1, creating a tear hole which is then used as an opening for removing the contents.

[0095] Furthermore, if the blank material 30 is made by attaching a resin material to the fibers that form the interior of the fiber sheet, the rigidity of the blank material 30 will not become too strong, and when the claw portion 24 is hooked onto the extension portion 7, it will be possible to create some flexion in the extension portion 7. Even if the tip of the claw portion 24 is inserted up to the edge 103 of the container 101, the tip of the claw portion 24 can be slid back to the extension portion 7 in the direction that releases the locking between the extension portion 7 and the claw portion 24. With the tip of the claw portion 24 positioned outside the edge 103 of the container 101, it becomes easy to form the holding structure. With such a holding structure formed, even if contamination occurs on the edge 103 of the container 101, the contamination will not spread to the claw portion 24 of the lid 1, thus improving hygiene.

[0096] The configuration shown in Modification 3 of the Second Embodiment, which reduces the size of the extension portion 7 as shown in Figure 10, can also be applied to a lid that uses a sheet material in which a resin layer is formed on the surface of at least one of the exposed surface 72 and the opposing surface 73 of the fiber sheet 31, instead of a lid 1 having a blank material 30. However, when the lid 1 is a blank material 30 and the extension portion 7 is also formed from the blank material 30, it is more preferable compared to using a sheet material with a resin layer formed on it, as it is easier to roughen the surface of the extension portion 7 and easier to create some deflection in the extension portion 7.

[0097] [3 Third Embodiment] In the lid 1 according to the first and second embodiments, a window portion may be formed as shown in Figures 5A and 5B. This embodiment will be referred to as the third embodiment. Figure 5A is a plan view showing one embodiment of the lid 1 according to the third embodiment. Figure 5B is a schematic cross-sectional view showing the state of the lid 1 shown in Figure 5A along the BB line.

[0098] (Window section) The window section 40 is a light-transmitting section in the lidded container 150 that improves visibility of the interior of the space 105 from the outside. The window section 40 has a structure in which an opening (opening 41 inside the lid) formed in the lid area corresponding section 5B is covered with a window sheet 42 such as a light-transmitting film. The window sheet 42 is not particularly limited as long as it is a light-transmitting material such as a light-transmitting film, and examples of films made of the following materials can be given. Examples of materials for the film forming the window sheet 42 include synthetic resins and natural resins. Examples of synthetic and natural resins include olefin resins such as polyethylene (PE) and polypropylene (PP), styrene resins such as polystyrene (PS), acrylic resins such as polyacrylate and polymethacrylate, vinyl resins such as polyvinyl chloride (PVC) and polyvinyl acetate, polyamide resins, polyimide resins, polyester resins such as polyethylene terephthalate (PET), fluororesins, polycarbonate resins (PC), and polyether resins such as polyetheretherketone (PEEK) and polyethersulfone (PES). From the viewpoint of reducing environmental impact, biodegradable resins are preferred as the material for the film forming the window sheet 42. Examples of biodegradable resins include microbially produced biodegradable resins such as polyhydroxyalkanoates (PHA) and PHA copolymers; natural product biodegradable resins such as cellulose derivatives like cellulose acetate and starch-based resins mainly made from starch like corn starch; lactic acid-based resins such as polylactic acid (PLA), polylactic acid / polycaprolactone copolymers, and polylactic acid / polyether copolymers; succinate-based resins such as polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyethylene terephthalate succinate (PETS); chemically synthesized biodegradable resins such as polycaprolactone and polyvinyl alcohol (PVA); and others such as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product name: Biorecover, trade name: Cra Drop, etc.).

[0099] Furthermore, if the contents of the container are liquid or the like, it is preferable that the window sheet 42 be made of a material with excellent water resistance, oil resistance, etc.

[0100] The window sheet 42 provided in the window portion 40 forms an adhesive portion (adhesive portion 46) that is bonded along the portion of the blank material 30 corresponding to the periphery of the lid opening 41. The method of bonding the window sheet 42 to the portion corresponding to the periphery of the lid opening 41 is not particularly limited. For example, hot melt adhesive may be applied between the periphery of the lid opening 41 and the window sheet 42 to form a coated portion, and the window sheet 42 may be bonded to the portion corresponding to the periphery of the lid opening 41 by heat sealing the coated portion, thereby forming the adhesive portion 46. In the example of Figure 5A, the window portion 40 was provided on the lid 1 according to the first embodiment, but it may also be provided on the lid 1 according to the second embodiment as illustrated in Figure 11A, or on the lid 1 according to the fourth embodiment described later as illustrated in Figures 11B and 11C. Figures 11A and 11B are plan views showing other examples of the lid 1 according to the third embodiment, and Figure 11C is a schematic cross-sectional view showing the state of the longitudinal section along the GG line in Figure 11B.

[0101] The configuration of the window portion 40 shown in the third embodiment can also be applied to a lid that uses a sheet material in which a resin layer is formed on the surface of at least one of the exposed surface 72 and the opposing surface 73 of the fiber sheet 31, instead of the lid 1 having a blank material 30. However, if the lid 1 is a blank material 30, it is more preferable in that good adhesion between the window sheet 42 and the blank material 30 can be expected even if various resin materials are used as the material such as hot melt to form the adhesive portion 46 between the window sheet 42 and the blank material 30.

[0102] [4. Fourth Embodiment] In the lid 1 according to the first to third embodiments, a raised portion (bulge) may be formed as shown in Figures 6A, 6B, etc. This embodiment will be referred to as the fourth embodiment.

[0103] (ridge) The raised portion 43 is formed on the exposed surface 72 side of the lid 1 and is a portion that protrudes upward (towards the +Z direction) with respect to the outside of the raised portion 43 (outside of the base end of the raised portion 43) (in the example of Figures 6A and 6B, it is a portion that protrudes towards the +Z direction with respect to the position of the joint area corresponding portion 5A). Preferably, the raised portion 43 is provided inward from the inner edge of the joint area corresponding portion 5A. That is, the raised portion 43 may be formed over the entire lid area corresponding portion 5B, or it may be provided on a part of the inside of the lid area corresponding portion 5B.

[0104] (Collapsed area) On the side of the lid 1 opposite to the exposed surface 72 (the side facing the surface 73), a recessed portion 44 is formed in the portion corresponding to the raised portion 43 (the opposing portion). In this case, the portion forming the raised portion 43 becomes the convex structure in the embossed structure. This makes it easy to maintain the state in which the lid 1 is attached without the contents coming into contact with the lid 1, even if the contents are located above the opening 102 of the container 101 when the container 150 is fitted with a lid. For example, if the container 101 contains a liquid such as coffee and fresh cream is floated on the surface of the liquid, even if the upper end of the fresh cream is located above the opening 102 of the container 101, the upper end of the fresh cream can be contained within the space of the recessed portion 44, and the risk of the upper end of the fresh cream coming into contact with the opposing surface 73 of the lid 1 can be suppressed.

[0105] If a raised portion 43 is formed on the lid 1, it is preferable, as shown in Figures 11B and 11C, that a window portion 40 is formed in the region including the tip portion 43A of the raised portion 43, from the viewpoint of making it easy to visually inspect the entire space (recessed portion 44) including the space portion 105 inside the container 101.

[0106] Furthermore, if a raised portion 43 is formed on the lid 1, it is preferable that the outer peripheral edge 3A of the small lid 3 and the hinge portion 4 are formed along the base end of the raised portion 43, as shown in Figures 6A and 6B. In this case, when the small lid 3 is pulled up using the hinge portion 4 as an axis, the entire raised portion 43 can be raised.

[0107] (Manufacturing method) The lid 1 according to the fourth embodiment can be manufactured, for example, as follows: As described in [1-2 Manufacturing Method] in the first embodiment above, an immersion step and a drying step are performed. However, during or before the drying step (but after the immersion step (i.e., between the immersion step and the drying step)), a shaping process is performed to shape the fiber sheet 31 containing the immersion liquid. Embossing is an example of the shaping process. In the shaping process, structures corresponding to the raised portions 43 are formed (structures corresponding to the recessed portions 44 are also formed). After the shaping process and the drying step are performed, a blank material 30 is formed by processing according to the shape of the lid 1.

[0108] In the drying process, it is preferable that the water and non-aqueous solvent contained in the fiber sheet 31 containing the immersion liquid be almost completely evaporated, or that some moisture and non-aqueous solvent remain in the fiber sheet. If some moisture and non-aqueous solvent remain in the fiber sheet, a shaping treatment may be applied after the drying process. However, from the viewpoint of improving the appearance of the raised parts formed by the shaping process, it is preferable to apply the shaping treatment during or before the drying process.

[0109] The configuration of the raised portion 43 (and recessed portion 44) shown in the fourth embodiment can also be applied to a lid made of a sheet material in which a resin layer is formed on the surface of at least one of the exposed surface 72 and the opposing surface 73 of the fiber sheet 31, instead of the lid 1 having a blank material 30. However, if the lid 1 is a blank material 30, the manufacturing method of the lid 1 according to the fourth embodiment described above can be easily applied, and it is more preferable in that it is easier to obtain a raised portion 43 with a good appearance.

[0110] In the lid 1 according to the first to fourth embodiments described above, the lid 1 is joined to the container 101 in the state of the container 150 with the lid described later, forming a joint portion 151. The joint portion 151 is the part where the container 101 and the lid 1 are bonded (including adhesive), and in order to separate the lid 1 and the container 101, the lid 1 and the container 101 are separated at the joint portion 151. The lid 1 is not limited to this, and as described below, the lid 1 may be fitted onto the container 101.

[0111] [5. Fifth Embodiment] [5-1 Structure] The lid 201 according to the fifth embodiment has a top portion 202 and a side wall portion 203, as illustrated in Figures 15A and 15B. The lid 201 according to the fifth embodiment is formed to be in contact with a container 101 having an opening 102 formed at its upper end and an edge portion 103 that forms the outer circumference of the opening 102, as will be described later using Figure 21, etc. Regarding the state of contact between the lid 201 and the container, the lid 201 is formed to be fitted into a container having an opening 102 formed at its upper end and an edge portion 103 that forms the outer circumference of the opening 102. Figure 15A is a schematic perspective view showing one embodiment of the lid according to the fifth embodiment. Figure 15B is a schematic cross-sectional view showing one embodiment of the lid according to the fifth embodiment. Note that Figure 15B shows the state of the longitudinal section along the NN line in Figure 15A. Figure 21 is a cross-sectional view showing an example of a container with a lid 150, in which the lid 1 shown in Figures 15A and 15B is joined to the container 101. In Figure 15A, the NN line is positioned so as to pass roughly directly above the insertion opening 219. The same applies to the JJ line in Figure 16A, the KK line in Figure 17A, and the LL line in Figure 18A.

[0112] As shown in the examples in Figures 15A and 15B, it is preferable that the lid 201 has a curved portion 204. The curved portion 204 is the part that connects the top portion 202 and the side wall portion 203, and in the examples in Figures 15A and 15B, the curved portion 204 and the side wall portion 203 are formed continuously (integrally).

[0113] (Canopy section) As shown in Figure 21, the top cover portion 202 is the part that covers the opening 102 of the container 101 when the lid 201 is attached to the container 101. The shape of the top cover portion 202 may be determined according to the shape of the container 101, and examples include circular, elliptical, triangular, rectangular, polygonal, and chamfered shapes.

[0114] (Bend) The curved portion 204 is formed to surround the outer edge of the canopy portion 202 and forms the boundary between the canopy portion 202 and the side wall portion 203. The curved portion 204 is formed so that when the lid 201 is attached to the container 101, the side wall portion 203 faces the side wall 104 or edge portion 103 of the container 101. In the examples of Figures 15A and 15B, the curved portion 204 has a folded structure, but as will be described later, the curved portion 204 is not limited to having a folded structure. Furthermore, the "portion that forms the boundary between the canopy portion 202 and the side wall portion 203" includes cases where the portion itself forms the boundary, and cases where the boundary is defined inside or at the end of the portion (cases where a part of the canopy portion 202 and / or the side wall portion 203 also serves as the curved portion 204). The boundary between the canopy portion 202 and the side wall portion 203 is defined in the center of the curved portion 204. When the curved portion 204 has a curved structure (for example, as shown in Figures 20A to 20B, which show an example of modification 4 of the fourth embodiment described later), the curved portion 204 is composed of a portion defined by the curved range, and the boundary between the canopy portion 202 and the side wall portion 203 is defined approximately in the center of the curved portion 204.

[0115] (Side wall section) The side wall portion 203 is formed in an annular shape along the outer peripheral edge of the canopy portion 202.

[0116] The lid 201 according to the fifth embodiment can be obtained by integrally forming the top portion 202, the curved portion 204, the side wall portion 203, and the top portion 202 by integrally molding a blank material 250 for forming the lid 201.

[0117] (Blank material) In the lid 201 according to the fifth embodiment, the blank material 250 may be formed in the same manner as the blank material 30 described in the first to fourth embodiments. That is, the blank material 250 is formed from a sheet material having a fiber sheet 260 containing fibers formed from a paper-based material and a resin material. The sheet material has a structure in which the resin material is attached to at least some of the fibers forming the interior of the fiber sheet 260. The resin material may be the same as that described in the first to fourth embodiments. The fiber sheet 260 may be the same as the fiber sheet 31 described in the first to fourth embodiments.

[0118] (Contact area) The lid 201 has a contact portion 274 that contacts the container 101 when fitted onto the container 101. The contact portion 274 is formed on a predetermined part of the side wall portion 203 (first contact portion 274A). Furthermore, it is preferable that the contact portion 274 is formed on a portion of the top lid portion 202 corresponding to a predetermined area on the opposing surface 273 side (second contact portion 274B), as shown in Figure 15B. When the lid 201 is fitted onto the container 101, the formation of the contact portion 274 can suppress the risk of the contents of the container 101 leaking to the outside. The first contact portion 274A is preferably formed around the entire outer edge of the container rim 103 and is preferably formed in an annular shape. The second contact portion 274B is preferably formed around the entire upper edge of the container rim 103 and is preferably formed in an annular shape. The first contact portion 274A and the second contact portion 274B may be separated from each other or connected. The same applies to the contact portion 274 (including the first contact portion 274A and the second contact portion 274B) shown in the fifth embodiment, as well as to the sixth, seventh, and eighth embodiments (sixth to eighth embodiments) described later.

[0119] Furthermore, in the examples of Figures 15A and 15B, a through-hole 210 is formed at a predetermined position in the canopy portion 202. An insertion opening 219 is formed as this through-hole 210. The through-hole 210 is formed by a notch 208. In the example of Figure 15, the notch 208 is a cross-shaped notch. The insertion opening 219 and the through-hole 210 may be formed in the same way as the insertion opening 19 and through-hole 10 described in the first embodiment. The through-hole 210 is a portion that penetrates the canopy portion 202 from the exposed surface 272 to the opposing surface 273. In the region forming the circumferential surface of the through-hole 210 (similar to the region of the circumferential surface 11 described in the first embodiment), the cross-section of the fiber sheet 260 is exposed, as described in the first embodiment. In addition, at least a portion of the resin material is exposed on at least a part of the cross-section of the fiber sheet 260 exposed on the circumferential surface of the through-hole 210. The exposure of the cross-section of the fiber sheet 260 and the resin material as shown in the fifth embodiment is the same for the sixth to eighth embodiments described later.

[0120] [5-2 Action and Effects] When a blank material for forming a lid with a curved section (a lid having a side wall section, a curved section, and a top section) is made of a paper-based material, numerous fine wrinkles and folds occur near the curved section and on the side wall section when the blank material is shaped into the shape of the lid (three-dimensional shape). If the blank material is made only of a paper-based material, a restorative force acts on the fibers that make up the lid after shaping, and furthermore, these fine wrinkles and folds may return to their original shape due to the influence of forces applied to the lid when handling it or when attaching the lid to a container. In this regard, the lid 201 according to the fifth embodiment can suppress the risk of the blank material 250 returning to its original shape after shape deformation (shaping) during integral molding.

[0121] [5-3 Variant Example] (Modification 1 of the fifth embodiment) In the lid 201 according to the fifth embodiment, the top portion 202 and the side wall portion 203 may be formed from separate members, as shown in Figures 18A and 18B, etc. (Modification 1 of the fifth embodiment). Modification 1 of the fifth embodiment includes cases where a part of the member forming the top portion 202 forms a part of the side wall portion 203, and cases where a part of the member forming the side wall portion 203 forms a part of the top portion 202. Figures 18A and 18B show an example where a part of the member forming the top portion 202 forms a part of the side wall portion 203.

[0122] In the modified example 1 of the fifth embodiment shown in Figures 18A and 18B, etc., a canopy-forming member 222 having a first portion 231 for forming a canopy portion 202 and a side wall-forming member 223 for forming a side wall portion 203 are prepared. A joining allowance 230 is extended from the outer end (outer edge end) of the first portion 231 of the canopy-forming member 222 as a second portion 232, which is configured to be joinable to the side wall-forming member 223. By bonding the joining allowance 230 of the canopy-forming member 222 to the upper end of the side wall-forming member 223, the canopy-forming member 222 and the side wall-forming member 223 are joined, thereby forming a curved portion 204. At this time, the canopy-forming member 222 and the side wall-forming member 223 are joined together. In this case, as shown in Figures 19A and 19B, blank materials can be used to form the canopy forming member 222 and the side wall forming member 223 (referred to as the first blank material 251 and the second blank material 252, respectively). The first blank material 251 for forming the canopy forming member 222 may be a sheet material formed to match the shape of the canopy 202 with a joining allowance 230. The second blank material 252 is shaped according to the shape of the side wall 203. For example, if the side wall 203 is shaped to narrow or widen towards the tip, a fan-shaped (partially fan-shaped) sheet material may be used. The end edges 253, 253 at both ends of the second blank material 252 can be joined to obtain the side wall forming member 223 that forms the side wall 203.

[0123] In the fifth embodiment, modification 1, at least one blank material selected from the group consisting of the first blank material 251 and the second blank material 252 may be formed in the same manner as the blank material 30 described above. That is, at least one blank material selected from the group consisting of the first blank material 251 and the second blank material 252 has a fiber sheet 260 containing fibers formed from a paper-based material. A resin material is attached to at least some of the fibers that form the interior of the fiber sheet. In the examples of Figures 18A, 18B, 19A, and 19B, the first blank material and the second blank material have a fiber sheet 260 containing fibers formed from a paper-based material.

[0124] (Modification 2 of the fifth embodiment) In the examples shown in Figures 15A and 15B, the side wall portion 203 is formed to taper downwards (towards the -Z direction) (the inner diameter of the cross-section becomes smaller (diagonal reduction)), but this is a preferred example, and the side wall portion 203 may be formed to widen downwards (the inner diameter of the cross-section becomes larger (diagonal expansion)). Alternatively, the side wall portion 203 may be formed to neither widen nor narrow downwards (the inner diameter of the cross-section remains constant), and the side wall portion 203 may be formed to have a portion that widens or narrows downwards (a portion where the inner diameter of the cross-section changes) (Modification 2 of the 5th embodiment). What is shown in Modification 2 of the 5th embodiment is also true for the 6th to 8th embodiments described later. Note that the cross-section shows the cross-sectional surface of the side wall portion as seen when the side wall portion is cut by a plane with the vertical direction as the normal. The inner diameter of the cross-section indicates the diameter on the inner circumferential side when the cross-section is roughly annular.

[0125] (Modification 3 of the fifth embodiment) The top portion 202 of the lid 201 according to the fifth embodiment may be configured as described in the second to fourth embodiments (modification 3 of the fifth embodiment). Therefore, in modification 3 of the fifth embodiment, the top portion 202 may have a configuration corresponding to the opening forming portion 20 (corresponding to the second embodiment), a configuration corresponding to the window portion 40 (corresponding to the third embodiment), a configuration corresponding to the raised portion 43 (corresponding to the fourth embodiment), and combinations of these configurations may exist simultaneously. Furthermore, the lid 201 according to the fifth embodiment is not prohibited from being provided with configurations corresponding to the modifications shown in the first and second embodiments. What is shown in modification 3 of the fifth embodiment also applies to the sixth to eighth embodiments which will be described later. In the lid 201 according to modification 3 of the fifth embodiment, the configuration of the insertion opening 219 may be omitted.

[0126] (Modification 4 of the fifth embodiment) In the lid 201 according to the eighth embodiment, the curved portion 204 may be composed of a protruding portion 226, as shown in Figures 20A to 20B. Furthermore, a protrusion 225 may be formed at the end of the protruding portion 226 (inner end 228A, outer end 228B) that is closer to the side wall portion 203 (outer end 228B) or in its vicinity.

[0127] (overhang) In the example of the lid 201 according to the eighth embodiment shown in Figures 20A to 20B, a protruding portion 226 is formed as a structure (protruding structure) in which a predetermined area on the outer peripheral end side of the top cover portion 202 protrudes diagonally upward. The direction of protrusion of the protruding portion 226 may be upward or lateral (the planar direction of the top cover portion 202). In addition, the inner surface 226A side of the protruding portion 226 is a recessed portion (recessed portion 227). The shape of the recessed portion 227 corresponds to the shape of the protruding portion 26. This can be realized according to the shape of the mold used when forming the lid 201 from the blank material 250. Preferably, the size of the recessed portion 227 is large enough to fit the edge portion 103 of the container 101. With the size of the immersion section 227 being such that when the lid 201 is used as a container 150 with a lid, the edge 103 fits largely into the immersion section 227, and the outer end portion of the edge 103 (the outer peripheral surface portion 111 of the edge 103 in the example of Figure 20) can be made to make surface contact with the immersion section 227, making it easy to securely attach the lid 201 to the edge 103 of the container 101.

[0128] (Convex part) As shown in the example from Figure 20A to Figure 20B, a protrusion 225 may be formed on the side wall portion 203. The protrusion 225 is defined, for example, as a portion that protrudes inward (towards the center CT direction, from the outer peripheral surface 203B of the side wall portion 203 toward the inner peripheral surface 203A) at a predetermined position on the side wall portion 203. Preferably, the protrusion 225 is a ridged protrusion formed in a ridge shape so as to encircle the inner peripheral surface of the side wall portion 203. The convex structure of the protrusion 225 is formed on the inner peripheral surface side of the side wall portion 203, and a recess 224 may be formed on the outer peripheral surface 203B side of the side wall portion 203 at a position corresponding to the position where the convex structure is formed. By forming such a structure, the shape of the side wall portion 203 can be further stabilized.

[0129] [6. Sixth Embodiment] [6-1 Structure] The lid 201 according to the sixth embodiment is similar to the fifth embodiment in that it has a top portion 202 and a side wall portion 203, and is fittable to a container, as shown in Figures 16A and 16B. The lid 201A according to the sixth embodiment has a configuration in which a part of the side wall portion 203 extends above and below the top portion 202. The side wall portion 203 has an annular (including cylindrical) shape and has an upper wall 205 and a lower wall 206. The lower wall 206 is the part that extends below the top portion 202, and the upper wall 205 is composed of the part of the side wall portion 203 excluding the lower wall 206. In the example of Figures 16A and 16B, the side wall portion 203 is formed to taper downwards. Also, in the example of Figures 16A and 16B, a through portion 210 is formed at a predetermined position in the top portion 202, but this is just an example.

[0130] (Members that form the canopy and side walls, respectively) In the sixth embodiment, as shown in Modification 1 of the fifth embodiment, the canopy portion 202 and the side wall portion 203 are formed from separate members. In the example of Figures 16A and 16B, the lid 201 has a canopy portion forming member 222 and a side wall portion forming member 223 as the separate members described above, and has a joint portion that joins the canopy portion forming member 222 and the side wall portion forming member 223.

[0131] (Canopy forming member) The canopy-forming member 222 has a first portion (first portion 231 of the canopy-forming member 222) corresponding to the canopy portion 202 and a second portion (second portion 232 of the canopy-forming member 222) extending from the outer peripheral end of the first portion 231, where the second portion 232 is the joining allowance 230 shown in the modified example 1 of the fifth embodiment. In the example of Figure 16A, the second portion 232 of the canopy-forming member 222 is a portion (rising portion) that rises diagonally upward or directly upward from the outer peripheral end of the first portion 231 in the state of the lid 201, and when the second portion 232 is joined to the side wall-forming member 223, the second portion 232 becomes part of the side wall portion 203.

[0132] (Side wall forming member) The side wall forming member 223 is formed in an annular (including cylindrical) shape and has a portion that forms the upper wall 205 (upper forming portion) and a portion that forms the lower wall 206 (lower forming portion). The upper forming portion has a portion (first contact wall portion 233) that contacts the joining allowance 230 which becomes the second portion 232 of the canopy forming member 222 at least on the outer side.

[0133] In the examples shown in Figures 16A and 16B, the upper wall 205 (upper forming portion) has a first contact wall portion 233, a portion (second contact wall portion 234) that contacts the joining allowance 230 which becomes the second portion 232 of the canopy forming member 222 on its inner side, and a continuous portion 235 that connects the first contact wall portion 233 and the second contact wall portion 234. The continuous portion 235 covers the upper end surface of the joining allowance 230 which becomes the second portion of the canopy forming member 222. The lower end of the second contact wall portion 234 is located on the upper side of the first portion 231 of the canopy forming member 222, and in the examples shown in Figures 16A and 16B, it is slightly spaced apart from the first portion 231. However, this is just one example, and the lower end of the second contact wall portion 234 may be in contact with the upper side of the first portion 231 of the canopy forming member 222.

[0134] In the examples shown in Figures 16A and 16B, the lower wall 206 (lower forming portion) is a portion that extends downward (diagonally downward in Figures 16A and 16B) with the lower end of the first contact wall portion 233 as its base. The lower wall 206 (lower forming portion) is preferably located, for example, below the lower surface of the first portion 231 of the canopy forming member 222 with respect to its vertical position.

[0135] (Blank material) The lid 201 according to the sixth embodiment can be formed by processing a blank material. As the blank material, a blank material for forming the canopy portion forming member 222 and the side wall portion forming member 223 (referred to as the first blank material and the second blank material, respectively, as described above in Modification 1 of the fifth embodiment) can be used. At least one blank material selected from the group consisting of the first blank material and the second blank material may be formed in the same manner as the blank material 30 described above, as described above in Modification 1 of the fifth embodiment.

[0136] The first blank material for forming the canopy portion forming member 222 may be the same as the first blank material 251 described above in Modification 1 of the fifth embodiment, and a sheet material formed in a shape that further incorporates a joining allowance 230 into the shape of the canopy portion 202 may be used. The canopy portion forming member 222 is preferably formed by folding the first blank material to create a first portion 231 corresponding to the canopy portion 202 and a rising portion (second portion 232 which becomes the joining allowance). That is, the second portion 232 is preferably formed by bending the first blank material upward at the position of the periphery of the first portion 231 (the base end of the joining allowance 230).

[0137] The second blank material may be the same as the second blank material 252 described above in Modification 1 of the fifth embodiment, and a fan-shaped sheet material may be used. The edges of the second blank material are joined to form an annular body. The upper end portion of the annular body is folded inward at a position corresponding to the continuous portion 235, thereby forming the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235, as well as the upper forming portion (structural portion corresponding to the upper wall 205), and further forming the lower forming portion (structural portion corresponding to the lower wall 206). The formation of the upper forming portion and the lower forming portion forms the side wall forming member 223. At least the first contact wall portion 233 and the second contact wall portion 234 are bonded to the joining portion 230. In the example of Figure 16B, the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235 are bonded to the joining portion 230, and a bonded portion is formed.

[0138] Furthermore, in the manufacture of the lid 201, it is preferable to use the annular body formed from the second blank material described above. The lower end of the joining allowance 230 (second portion 232) of the lid forming member 222 is aligned with the boundary position between the lower forming portion and the upper forming portion (boundary position between the upper wall 2505 and the lower wall 206) on the inner circumferential surface of the annular body, so that the joining allowance 230 faces the inner circumferential surface of the annular body. In addition, as described above, the upper end portion of the annular body is folded inward at the position corresponding to the continuous portion 235 of the annular body, thereby covering the joining allowance 230 from the upper end side. Then, the joining allowance 230 is joined to the annular body that will become the side wall forming member 223 so that it is sandwiched between the first contact wall portion 233 and the second contact wall portion 234. As a result, the side wall forming member 223 is formed and the lid 201 is obtained.

[0139] [6-2 Action and Effects] According to the lid 201 of the sixth embodiment, similar to the fifth embodiment, it is possible to suppress the risk of the lid 201 returning to its original shape after shape deformation (shaping) when manufacturing the canopy forming member 222 and the side wall forming member 223 from blank materials (first blank material, second blank material).

[0140] [7 Seventh Embodiment] [7-1 Composition] The lid 201 according to the seventh embodiment is similar to the fifth embodiment in that it has a top portion 202 and side wall portions 203 and is fittable to a container, as shown in Figures 17A and 17B. The lid 201 according to the seventh embodiment has a configuration in which a part of the side wall portion 203 extends above and below the top portion 202. The side wall portion 203 has an annular (including cylindrical) shape and has an upper wall 205 and a lower wall 206. The lower wall 206 is the part that extends below the top portion 202, and the upper wall 205 is composed of the part of the side wall portion 203 excluding the lower wall 206. In the example of Figures 17A and 17B, the side wall portion 203 is formed to taper downwards. Also, in the example of Figures 17A and 17B, a through portion 210 is formed at a predetermined position in the top portion 202, but this is just an example.

[0141] (Members that form the canopy and side walls, respectively) In the seventh embodiment, as shown in the modified example 1 of the fifth embodiment and the sixth embodiment, the canopy portion 202 and the side wall portion 203 are formed from separate members. In the example shown in Figures 17A and 17B, the lid 201 has a canopy portion forming member 222 and a side wall portion forming member 223 as the separate members described above, and has a joint portion that joins the canopy portion forming member 222 and the side wall portion forming member 223.

[0142] (Canopy forming member) The canopy-forming member 222 has a first portion (first portion 231 of the canopy-forming member 222) corresponding to the canopy portion 202 and a second portion (second portion 232 of the canopy-forming member 222) extending from the outer peripheral end of the first portion 231, and the second portion 232 is the joining allowance 230 shown in the modified example 1 of the fifth embodiment. In the example of Figure 16A, the second portion of the canopy-forming member 222 is a portion (hanging portion) that extends diagonally downward or directly downward from the outer peripheral end of the first portion 231, and when the second portion 232 is joined to the side wall-forming member 223, the second portion 232 becomes part of the side wall portion 203.

[0143] (Side wall forming member) The side wall forming member 223 is formed in an annular (including cylindrical) shape and has a portion that forms the upper wall 205 (upper forming portion) and a portion that forms the lower wall 206 (lower forming portion). The lower forming portion has a portion (lower first contact wall portion 237) that contacts the joining allowance 230 which becomes the second portion 232 of the canopy forming member 222 at least on the outer side.

[0144] In the examples of Figures 17A and 17B, the lower forming portion has a lower first contact wall portion 237, a portion (lower second contact wall portion 238) that contacts the joining allowance 230 which becomes the second portion 232 of the canopy forming member 222 on the inner side, and a lower end continuous portion 239 that connects the lower first contact wall portion 237 and the lower second contact wall portion 238. The lower end continuous portion 239 covers the lower end surface of the joining allowance 230 which becomes the second portion 232 of the canopy forming member 222. The upper end of the lower second contact wall portion 238 is located on the lower surface (opposing surface 273) side of the first portion 231 of the canopy forming member 222, and in the examples of Figures 17A and 17B, it is preferable that it is spaced apart from the first portion 231. Preferably, the edge portion 103 of the container 101 (for example, a part of the outer surface of the curled portion) can fit between the first portion and the upper end of the lower second contact wall portion 238.

[0145] In the examples of Figures 17A and 17B, the upper wall 205 (upper forming portion) is a portion that extends upward (diagonally upward in Figure 17B) with the upper end of the lower first contact wall portion 237 as its base. The upper wall 205 (upper forming portion) is preferably located above the upper surface of the first portion 231 of the canopy forming member 222 with respect to its vertical position. As shown in the examples of Figures 17A and 17B, it is preferable that the upper forming portion has a curled portion (side wall upper end curled portion 236) formed on its upper end side. In this case, it is possible to prevent the end face of the blank material (second blank material for forming the side wall forming member 223) from being exposed at the upper end of the upper forming portion, and even when a user brings their mouth to the end face of the blank material to ingest the contents of the container 101, it is possible to suppress the discomfort associated with the user bringing their mouth to the end face of the blank material. Furthermore, the formation of the curled portion 236 at the upper end of the side wall makes it less likely for liquid to come into contact with the portion of the side wall 203 that corresponds to the end face of the blank material.

[0146] (Blank material) The lid 201 according to the seventh embodiment can be formed by processing a blank material. As the blank material, a blank material for forming the canopy portion forming member 222 and the side wall portion forming member 223 (referred to as the first blank material and the second blank material, respectively, as described above in Modification 1 of the fifth embodiment) can be used. At least one blank material selected from the group consisting of the first blank material and the second blank material may be formed in the same manner as the blank material 30 described above, as described above in Modification 1 of the fifth embodiment.

[0147] The first blank material for forming the canopy portion forming member 222 may be the same as the first blank material 251 described above in Modification 1 of the fifth embodiment, and a sheet material formed in a shape that further incorporates a joining allowance 230 into the shape of the canopy portion 202 may be used. The canopy portion forming member 222 is preferably formed by bending the first blank material to form a first portion 231 corresponding to the canopy portion 202 and a second portion 232 that becomes the joining allowance 230. That is, the second portion 232 is preferably formed by bending the first blank material downward at the periphery of the first portion 231.

[0148] The second blank material may be the same as the second blank material 252 described above in Modification 1 of the fifth embodiment, and a fan-shaped sheet material may be used. The edges of the second blank material are joined to form an annular body, and the lower end portion of the annular body is folded inward at a position corresponding to the lower end continuous portion 239, thereby forming the lower first contact wall portion 237, the lower second contact wall portion 238, and the lower end continuous portion 239, as well as the lower forming portion (lower wall 206), and further forming the upper forming portion (upper wall 205). The formation of the lower forming portion and the upper forming portion forms the side wall forming member 223.

[0149] Furthermore, in the manufacture of the lid 201, it is preferable to use the annular body formed from the second blank material as described above. The upper end of the joining allowance 230 (second portion 232) of the lid forming member 222 is aligned with the boundary position between the lower forming portion and the upper forming portion (boundary position between the upper wall 205 and the lower wall 206) on the inner circumferential surface of the annular body, so that the joining allowance 230 faces the inner circumferential surface of the annular body. In addition, as described above, the lower end portion of the annular body is folded inward at the position corresponding to the lower end continuous portion 239 of the annular body, thereby covering the joining allowance 230 from the lower end side. Then, the joining allowance 230 is joined (bonded) to the lower forming portion (annular body forming the side wall forming member 223) so that it is sandwiched between the lower first contact wall portion 237 and the lower second contact wall portion 238. As a result, the side wall forming member 223 is formed and the lid 201 is obtained.

[0150] [7-2 Action and Effects] According to the seventh embodiment of the lid 201, similar to the fifth embodiment, it is possible to suppress the risk of the lid returning to its original shape after shape deformation (shaping) when manufacturing the lid 201 by producing the top part forming member 222 and the side wall forming member 223 from blank materials (first blank material, second blank material).

[0151] [5. Examples of Application] (Example 1) The lid 1 according to the first embodiment can be used in a container with a lid 150, for example, as shown in Figures 14A and 14B. Figure 14A is a perspective view showing an embodiment in which the lid 1 according to the first embodiment is joined to the edge 103 that forms the outer circumference of the opening 102 of a container 101 having an opening 102 formed at its upper end, thereby bringing the container 101 and the lid 1 into contact (the edge 103 and the opposing surface portion into contact). Figure 14B is a schematic cross-sectional view showing the state of the longitudinal section along line II in Figure 14A. The description of the container with a lid 150 will continue using Figures 14A and 14B.

[0152] (Container with lid) The container with a lid 150 has a joint portion 151 where the container 101 and the lid 1 are joined, and the region of the lid 1 that forms the joint portion 151 is the joint region R. The method of joining the lid 1 and the container 101 is not particularly limited, and joining methods such as crimping or heat sealing can be used as appropriate. The following description will explain the case in which the lid 1 according to the first embodiment is used in the container with a lid 150 as an example.

[0153] In the example shown in Figures 14A and 14B, the container 101 has a container body 110 with cylindrical side walls 104 and a bottom 107 that are wider in diameter upwards (tapering downwards), forming an internal space 105, and an opening 102 that opens at the upper end of the container body 110 (the upper end of the side wall 104). Although not shown, the opening 102 of the container 101 is formed in a circular shape. However, the container 101 shown here is just an example and does not limit the configuration of the container 101. For example, the opening 102 of the container 101 may be formed in a rectangular shape. The container 101 only needs to be such that the opening 102 can be covered by the lid 1. Furthermore, what is stored inside the container 101 (the internal space 105) is not particularly limited, and examples include liquids, solids, or combinations thereof.

[0154] In the containers shown in Figures 14A and 14B, the edge portion 103 that forms the opening 102 (surrounding the opening 102) has a flange portion. The flange portion formed on the edge portion 103 may be a curled portion 108 formed by winding outward around the member forming the container body 110, as shown in Figures 14A and 14B, or it may be formed as a portion (rim portion) that extends outward in a planar direction.

[0155] Furthermore, the lid 1 according to the first embodiment may be combined with a container 101 having an opening 102.

[0156] (Example 2) The lid 1 according to the fifth embodiment can be used on a container 350 with a lid, for example, as shown in Figure 21. Figure 21 is a cross-sectional view showing an embodiment in which the lid 1 according to the fifth embodiment is fitted onto the edge 103 that forms the outer circumference of the opening 102 of a container 101 having an opening 102 formed at its upper end, thereby bringing the container 101 and the lid 1 into contact (the edge 103 and the top lid portion 202 into contact).

[0157] The container with a lid 350 can be obtained by fitting the lid 201 onto the edge 103 so as to cover the opening 102 of the container 101.

[0158] Furthermore, the lid 1 according to the fifth embodiment may be combined with a container 101 having an opening 102.

[0159] The example shown in (Example 1) of [5 Application Examples] above is not limited to the case where the lid 1 according to the first embodiment is used. The second to fourth embodiments can also be used in a container with a lid attached to a container 101, similar to the lid 1 according to the first embodiment (not shown).

[0160] The examples shown in (Example 2) of [5 Application Examples] above are not limited to the case where the lid 1 according to the fifth embodiment is used. The sixth to eighth embodiments can also be used in a container 350 with a lid attached to a container 101, similar to the lid 201 according to the fifth embodiment (not shown).

[0161] As described above, the lids 1, 201, etc. according to the present invention can be applied to many such embodiments of the lids 1, 201, etc. Furthermore, they can also be applied to embodiments of the lids 1, 201, etc. other than those described above. The lids according to the present invention have been described in detail above, but what has been described above is merely an example of the lids according to the present invention and is not limited thereto. Therefore, they may be modified as appropriate without departing from the spirit of the present invention. In addition, the configurations of the lids described above may be used independently for each example of the lid, or the configurations of the lids in each example may be combined as appropriate.

[0162] Based on the above description in this specification, the present invention may employ the configurations shown in [E1] to [E22] below.

[0163] [E1] A lid that is formed to be in contact with a container having a rim, and is formed from a blank material, the blank material having a fiber sheet containing fibers made of a paper-based material, and a resin material adhering to at least some of the fibers that form the interior of the fiber sheet. [E2] The lid according to [E1], having a joining region corresponding to a region joined to the container along the edge of the container, and a lid region corresponding to a portion formed inward from the joining region corresponding, wherein at least in the portion corresponding to the joining region, the resin material is attached to at least some of the fibers forming the interior of the fiber sheet. [E3] The cover according to [E1] or [E2] above, comprising a through portion cut from one side to the other side of the blank material, wherein the cross-section of the fiber sheet is exposed on the circumferential surface of the through portion, and the resin material is exposed on at least a part of the cross-section. [E4] The cover according to [E3] above, wherein the circumferential portion of the through-hole is an end portion, and the cover has an inclined portion that slopes upward in a direction away from the end portion. [E5] The lid according to [E3] or [E4] above, wherein the density of the fibers constituting the fiber sheet in the inclined portion is higher closer to the end of the inclined portion. [E6] The lid according to any one of [E3] to [E5] above, which is subordinate to [E2], wherein the lid area corresponding portion is provided with a weakening portion that guides the division position in the lid area corresponding portion, and the weakening portion has a plurality of through portions and at least one continuous portion formed between at least two of the through portions. [E7] The lid according to [E7] above, wherein the continuous portion has a half-cut structure. [E8] The lid according to [E6] or [E7] above, wherein the weakened portion has a plurality of the through portions arranged radially around the continuous portion. [E9] The lid area corresponding portion comprises a base portion having a small opening having an opening area smaller than the opening surrounded by the edge portion of the container, a small lid portion for opening and closing the small opening, and a hinge portion connecting the base portion and the small lid portion, wherein the small lid portion is configured to be rotatable with respect to the base portion about the hinge portion as an axis, and at least a portion of the through portion is formed at the boundary position between the outer peripheral edge of the small lid portion and the opening edge of the small opening, the lid according to any one of [E3] to [E8] above which is subordinate to [E2]. [E10] The lid according to [E9] above, wherein a knob is provided on the upper side of the small lid portion. [E11] The lid according to [E10], wherein the knob portion has a tab member, and the tab member is joined to the upper surface side of the small lid portion. [E12] The lid according to any one of [E9] to [E11] above, having a holding structure that holds the small lid in a state in which the small opening is opened by rotating the small lid relative to the base portion with the hinge portion as an axis. [E13] A lid according to any one of [E9] to [E12] above, wherein an extension is formed on the outer peripheral edge of the base portion, and the base portion and the extension are integrally formed from the blank material. [E14] The lid according to [E13], wherein the hinge portion is formed between the extension portion and the tip of the small lid portion. [E15] The lid according to [E9] above, having a holding structure that holds the small lid in a state in which the small opening is opened by rotating the small lid relative to the base with the hinge as an axis, a knob is provided on the upper surface side of the small lid, a claw is provided on the knob, and an extension is formed on the outer peripheral edge of the base, the extension and the receiving part form the holding structure. [E16] A lid according to any one of [E1] to [E15] above, wherein a raised portion is formed. [E17] A lid according to any one of [E1] to [E16] above, having a window portion formed therein. [E18] The lid according to any one of [E1] to [E17] above, wherein at least some of the resin material is impregnated between at least some of the fibers. [E19] A lid according to any one of [E1] to [E18] above, which is formed to be joinable and / or fitted to a container having a rim. [E20] A container with a lid, comprising a lid as described in any one of [E1] to [E19] above, and the container having the rim, wherein the lid is joined to the container. [E21] A combination of a lid and a container, comprising a lid as described in any one of [E1] to [E19] above, and the container having the rim. [E22] A method for manufacturing a lid, comprising: an immersion step of immersing a fiber sheet in an immersion liquid containing a resin material; and a drying step of drying the fiber sheet containing the immersion liquid. [E23] A method for manufacturing a lid according to [E22], comprising a shaping treatment in which the fiber sheet containing the immersion liquid is shaped during or before the drying process. [Explanation of symbols]

[0164] 1: Lid 2: Base section 2A: Outer edge 3: Small lid 3A: Outer edge 4: Hinge section 5A: Bonding area corresponding part 5B: Cover area corresponding section 5C: Lid area non-forming part 6: Small opening 6A: Opening edge 7: Extension part 7A:Outer edge 8: Cut section 10: Penetration section 11: Peripheral part 12: End 13: Inclined part 13A: End 14: Weakening part 15: Continuous section 16: Half-cut section 17: Connection Structure 19: Opening 20:Aperture forming part 21: Pickling part 22: Tab member 22A: One end 22B: Other end 23: Tab joint 24: Nail area 25: Receiving part 26: Overhang 30: Blank material 31: Fiber sheet 31A: Fibers 32: Resin materials 40: Window section 41:Opening inside the lid 42: Window film 43 :Protuberance 43A:Tip 44: Sinkhole 46: Adhesive part 50: Outer edge 72: Exposed surface 73: Opposing surface 74: Proximal end 75: Front edge 101: Container 102: Opening 103: Edge 104: Side wall 105: Spatial part 107: Bottom 108: Curl section 110: Container body 111: Outer circumference 150: Container with lid 151: Joint 201: Lid 202: Canopy 203: Side wall section 203A: Inner peripheral surface 203B: Outer surface 204: Curved section 205: Upper wall 206: Lower wall 208: Cut section 210: Penetration section 219: Entrance 222: Canopy forming member 223: Side wall forming member 224: Recess 225: Convex part 226: Overhang 226A: Inner surface 227: Immersion Club 228A :Inner end 228B: Outer end 230: Joining allowance 231: Part 1 232: Part 2 233: First contact wall part 234: Second contact wall part 235: Continuous section 236: Upper end of side wall curl 237: Lower first contact wall 238: Lower second contact wall 239: Lower end continuous section 250: Blank material 251: First blank material 252: Second blank material 253 :Edge 260: Fiber sheet 272 :Exposed surface 273: Opposing surface 274: Contact area 274A: First contact area 274B: Second contact point 350: Container with lid 2505: Upper wall CT: center D1: Extension distance D2: Separation distance F1: Arrow R: Junction area

Claims

[Claim 1] It is formed to be in contact with a container having a rim, and is formed from a blank material. The blank material has a fiber sheet containing fibers formed from a paper-based material, A resin material is attached to at least some of the fibers that form the interior of the fiber sheet. Cover.

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