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

Abstract

Provided are: a lid that uses a paper-based material, that is capable of preventing leakage of contents from a lid-equipped container and that improves recyclability; a container with the lid; and a combination of the lid and the container. The lid is configured so as to be attachable to a container having an opening part and an edge part forming the opening part. The lid body has a top surface part that covers the opening part when attached to the container. The top surface part comprises: a paper-based base material composed of a paper-based material; a penetration part penetrating the paper-based base material; a gas-liquid separation material capable of separating a gas of a gas phase and at least a part of a liquid of a liquid phase from a mixed fluid comprising the gas phase and the liquid phase; and a thermoplastic coating agent. The gas-liquid separation material has a paper-based ventilation sheet that includes long fibers and is air permeable. A liquid-repellent agent that imparts liquid repellency to the paper-based ventilation sheet is disposed on at least one surface of the paper-based ventilation sheet. The gas-liquid separation material is disposed so as to at least partially cover the penetration part in a plan view of the paper-based base material. The coating agent adheres the gas-liquid separation material to the paper-based base material.

Description

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

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

[0002] BACKGROUND ART It is common practice to place food, beverages, etc. (hereinafter also referred to as "contents") in a container with an opening at the top and then attach a lid to provide the container in a closed state.

[0003] From the viewpoint of reducing the environmental impact and the use of petroleum raw materials, it is desirable to use lids made of paper-based materials for affixing lids to containers. Known methods for attaching lids to containers include a method of joining the lid to the edge that forms the outer periphery of the opening at the top of the container using a method such as heat pressing (sealing method), and a method of fitting the lid into the container (fitting method). To consume the contents of a container with a lid attached (a container with a lid), as shown in Patent Document 1, the lid can be peeled off (removed) from the edge of the container, or, if the lid is attached to the container by the fitting method, the lid can be removed from the container. Alternatively, a penetration can be provided in the lid, and a member for retrieving the contents (e.g., a straw) can be inserted into the penetration (forming an insertion opening).

[0004] JP 2014-84128 A

[0005] When the lid has a penetration, there is room for improvement in terms of preventing the contents from spilling out onto the lid through the penetration when the lid covers the opening of the container. In particular, when the contents are those that emit steam or gas, such as hot beverages or cold carbonated beverages, the lid needs to be improved in terms of preventing the liquid components of the contents from leaking out together with the released steam or gas as the pressure inside the lidded container increases.

[0006] Furthermore, from the viewpoint of reducing the environmental impact, it is important not only to reduce the use of petroleum-based raw materials but also to improve recyclability of the lids, and therefore there is a demand for lids that can prevent leakage of liquid contents from containers with lids while using paper-based materials and that have improved recyclability.

[0007] In view of the above, the object of the present invention is to provide a lid, a container with a lid, and a combination of a lid and a container that are made of paper-based materials, can prevent leakage of contents from a container with a lid, and are recyclable.

[0008] The present invention is summarized as follows (1) to (10).

[0009] (1) A lid configured to be attached to a container having an opening and a rim that defines the opening, the lid having a top surface that covers the opening when attached to the container, the top surface including a paper-based base material made of a paper-based material, a through-hole that penetrates the paper-based base material, a gas-liquid separating material capable of separating the gas in the gas phase and at least a portion of the liquid in the liquid phase from a mixed fluid having a gas phase and a liquid phase, and a thermoplastic coating agent, the gas-liquid separating material having a paper-based breathable sheet that contains long fibers and is breathable, a liquid-repellent agent disposed on at least one side of the paper-based breathable sheet that imparts liquid repellency to the paper-based breathable sheet, the gas-liquid separating material being disposed so as to cover at least a portion of the through-hole in a plan view of the paper-based base material, and the coating agent bonding the gas-liquid separating material to the paper-based base material. (2) The lid according to (1), wherein the liquid-repellent agent is a water-repellent agent. (3) The lid according to (1) above, wherein the paper-based breathable sheet is a nonwoven fabric. (4) The lid according to (1) above, wherein the long fibers are paper fibers. (5) The lid according to (1) above, wherein the liquid repellent agent is adhered to at least a portion of the long fibers. (6) The lid according to (1) above, wherein the liquid repellent agent is also disposed inside the paper-based breathable sheet. (7) The lid according to (1) above, wherein the gas-liquid separating material has a notch and / or a half-cut portion formed at a predetermined position corresponding to the through-hole. (8) The lid according to (1) above, wherein the gas-liquid separating material contains the long fibers as a main component. (9) A container with a lid, comprising the lid according to (1) above and the container having the opening formed at the upper end and a rim forming the outer periphery of the opening, and the lid joined to the container. (10) A combination of a lid and a container, comprising the lid described in (1) above and the container having the opening formed at the top end and an edge forming the outer periphery of the opening.

[0010] According to the present invention, it is possible to provide a lid, a container with a lid, and a combination of a lid and a container that are made of paper-based materials, can prevent leakage of contents from the container with a lid, and are recyclable.

[0011] [Correction based on Rule 91, 19.06.2024] Figure 1A is a plan view illustrating an example of a lid according to the first embodiment. Figure 1B is a side view illustrating an example of a lid according to the first embodiment. Figure 1C is a cross-sectional view schematically illustrating a vertical cross section taken along line A-A in Figure 1A. Figure 1D is a cross-sectional view schematically illustrating a vertical cross section taken along line B-B in Figure 1B. Figures 2A and 2B are diagrams illustrating an example of a gas-liquid separating material. Figure 3A is a diagram illustrating an example of a gas-liquid separating material. Figures 3B, 3C, and 3D are diagrams illustrating the state in which a liquid repellent agent is attached to fibers. Figures 4A and 4B are plan views illustrating another example of a lid according to the first embodiment. Figure 5A is a plan view illustrating another example of a lid according to the first embodiment. Figure 5B is a bottom view illustrating another example of a lid according to the first embodiment. Figure 5C is a cross-sectional view schematically illustrating a vertical cross section taken along line C-C in Figure 5A. FIG. 6A is a plan view illustrating an example of a lid according to Modification 5 of the first embodiment. FIG. 6B is a cross-sectional view schematically illustrating a vertical cross section taken along line D-D in FIG. 6A. FIG. 7A is a plan view illustrating an example of a blank for forming the lid according to the first embodiment. FIG. 7B is a cross-sectional view schematically illustrating a vertical cross section taken along line E-E in FIG. 7A. FIG. 7C is a diagram illustrating an example of a process for shaping the blank. FIG. 7D is a diagram illustrating the blank in FIG. 7C when viewed from the direction of arrow DR. FIG. 8A is a plan view illustrating an example of a lid according to Modification 6 of the first embodiment. FIG. 8B is a cross-sectional view schematically illustrating a vertical cross section taken along line F-F in FIG. 8A. FIG. 9A is a plan view illustrating an example of a lid according to Modification 7 of the first embodiment. FIG. 9B is a cross-sectional view schematically illustrating a vertical cross section taken along line G-G in FIG. 9A. Fig. 9C is a cross-sectional view schematically illustrating an enlarged state of an area EI surrounded by a dashed dotted line in Fig. 9B. Fig. 10A is a perspective view for explaining an example of a lid according to the second embodiment. Fig. 10B is a cross-sectional view schematically illustrating a vertical cross section taken along line H-H in Fig. 10A. Fig. 11A is a perspective view for explaining an example of a lid according to the third embodiment. Fig. 11B is a cross-sectional view schematically illustrating a vertical cross section taken along line J-J in Fig. 11A.FIG. 12A is a perspective view illustrating an example of a lid according to the fourth embodiment. FIG. 12B is a cross-sectional view schematically illustrating a vertical cross section taken along line K-K in FIG. 12A. FIG. 13A is a plan view illustrating an example of a lid according to the fifth embodiment. FIG. 13B is a rear view illustrating an example of a lid according to the fifth embodiment. FIG. 13C is a cross-sectional view schematically illustrating a vertical cross section taken along line L-L in FIG. 13A. FIGS. 14A and 14B are plan views illustrating an example of a blank for forming a lid according to the second embodiment. FIG. 15A is a perspective view illustrating an example of a container with a lid. FIG. 15B is a cross-sectional view schematically illustrating a vertical cross section taken along line M-M in FIG. 15A. FIG. 16A is a perspective view illustrating an example of a container with a lid. FIG. 16B is a cross-sectional view schematically illustrating a vertical cross section taken along line N-N in FIG. 16A. FIG. 17A is a plan view illustrating an example of a lid according to Modification 1 of the first embodiment. FIG. 17B is a side view illustrating an example of a lid according to Modification 1 of the first embodiment. FIG. 17C is a cross-sectional view schematically illustrating a vertical cross section taken along line I-I in FIG. 17A. FIG. 18A is a plan view illustrating an example of a lid according to the first embodiment. FIG. 18B is a side view illustrating an example of a lid according to the first embodiment. FIG. 18C is a cross-sectional view schematically illustrating a vertical cross section taken along line O-O in FIG. 18A. FIG. 19A is a plan view illustrating an example of a lid according to the first embodiment. FIG. 19B is a side view illustrating an example of a lid according to the first embodiment. FIG. 19C is a cross-sectional view schematically illustrating a vertical cross section taken along line P-P in FIG. 19A. FIG. 20A is a plan view illustrating an example of a lid according to Configuration A1. FIG. 1B is a cross-sectional view schematically illustrating a vertical cross section taken along line Q-Q. FIG. 21A is an enlarged cross-sectional view schematically illustrating an enlarged region XR1 surrounded by a dashed line in FIG. 20A. Fig. 21B is an enlarged cross-sectional view schematically showing an enlarged state of region XR2 surrounded by a dashed line in Fig. 20B. Fig. 22A is a perspective view showing one embodiment of a container with a lid. Fig. 22B is a cross-sectional view schematically showing a longitudinal section taken along line R-R in Fig. 22A. Fig. 23A is a plan view showing one embodiment of a lid according to a first embodiment of form A2.FIG. 23B is a cross-sectional view showing the state of a vertical cross section taken along line S-S. FIG. 24A is an enlarged cross-sectional view schematically showing an enlarged state of region XS1 surrounded by a dashed line in FIG. 23B. FIG. 24B is an enlarged cross-sectional view schematically showing an enlarged state of region XS2 surrounded by a dashed line in FIG. 24A. FIG. 24C is an enlarged plan view schematically showing an example of fiber intersection. FIG. 25A is a perspective view showing one embodiment of a container with a lid. FIG. 25B is a cross-sectional view schematically showing the state of a vertical cross section taken along line T-T in FIG. 25A. FIG. 26A is an enlarged cross-sectional view schematically showing an enlarged state of region XS3 surrounded by a dashed line in FIG. 26B. FIG. 26B is an enlarged cross-sectional view schematically showing an enlarged state of region XS4 surrounded by a dashed line in FIG. 26A. FIG. 26C is an enlarged cross-sectional view schematically showing an enlarged state of region XA surrounded by a dashed line in FIG. 26B. Fig. 27A is an enlarged cross-sectional view showing an example of a lid according to the first embodiment. Fig. 27B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the first embodiment. Fig. 27C is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the second embodiment. Figs. 28A and 28B are enlarged cross-sectional views showing an example of a lid according to the first embodiment. Figs. 29A, 29B, and 29C are enlarged cross-sectional views showing an example of the position of a receiving structure in the lid according to the first embodiment. Fig. 30A is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the third embodiment. Fig. 30B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the third embodiment. Fig. 31A is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the fourth embodiment. Fig. 31B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the fourth embodiment. Fig. 32A is an enlarged cross-sectional view showing an example of a lid according to the fifth embodiment. Fig. 32B is an enlarged cross-sectional view showing one example of a lidded container using a lid according to the fifth embodiment. Fig. 33A is a plan view showing one example of a lid according to the first embodiment. Fig. 33B is a cross-sectional view showing the state of a vertical cross section taken along line U-U. Figs. 32A and 32B are diagrams for explaining the results of Example 1.

[0012] An example of the present invention will be described below with reference to the drawings. The description will be made in the following order: 1. First embodiment, 2. Second embodiment, 3. Third embodiment, 4. Fourth embodiment, 5. Fifth embodiment, 6. Application example, 7. Filter example, 8. Lid form A1, and 9. Lid form A2. In this specification and the drawings, components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0013] The following description is of a preferred specific example of the present invention, and the content of the present invention is not limited to the described embodiments. Furthermore, in the following description, directions such as front-to-back, left-to-right, and up-down are indicated for the sake of convenience, but the content of the present invention is not limited to these directions. In the examples of FIGS. 1 and 2, the Z-axis direction is the up-down direction (upper side is the +Z direction, lower side is the -Z direction), the X-axis direction is the front-to-back direction (front side is the +X direction, rear side is the -X direction), and the Y-axis direction is the left-to-right direction (right side is the +Y direction, left side is the -Y direction), and the description will be based on this. The same applies to FIGS. 3 to 33.

[0014] The relative size and thickness ratios of each layer shown in each drawing, such as Figure 1, are shown for convenience and do not limit the actual size ratios. The definitions of these directions and size ratios also apply to each drawing, such as Figures 2 to 33.

[0015] The lid of the present invention will be described using an example of a lid used for a container (cup) for holding a fluid such as a coffee cup or other beverage. However, the lid is not limited to a lid for a beverage container and can also be used for a container for holding food products containing liquid other than beverages. Furthermore, the lid of the present invention may also be used for containers that can hold various liquid items other than food and beverages. Furthermore, while the lid of the present invention will be described below using an example of a lid that is circular in plan view, the shape of the lid is not limited to a circular shape in plan view and can be applied to various shapes other than a circle, such as an ellipse, a polygonal shape such as a rectangle or a triangle, a chamfered rectangle, or a chamfered polygon. However, from the perspective of further enhancing the effects of the present invention, it is preferable that the lid be attached to a container that contains a mixed fluid or a substance containing a mixed fluid.

[0016] In this specification, a mixed fluid refers to a fluid having a gas phase containing gas and a liquid phase containing liquid, and examples thereof include a liquid having bubbles (in this case, the gas phase is the gas within the bubbles and the liquid phase is composed of the liquid surrounding the bubbles) and a fluid having (dispersed) aerosol-like droplets in a gas (in this case, the gas phase is the gas surrounding the aerosol-like droplets and the liquid phase is composed of the liquid that forms the droplets).

[0017] [1. First Embodiment] [1-1 Lid] The lid 10 according to the first embodiment of the present invention can be used (as a lidded container 150) in a state where it is attached (fitted) to the edge 103 of the opening 102 of a container 101, as will be described later using Figure 15 etc. The lid 10 is formed so that a contact region R can be formed on the opposing surface of the lid 10 that comes into contact with the edge 103 of the container 101 having the opening 102.

[0018] In this specification, the opposing surface 73 of the lid body 10 refers to the surface opposite to the exposed surface 72, and the exposed surface 72 of the lid body 10 refers to the surface that is exposed to the outside in the state of the container with lid 150. Therefore, the opposing surface 73 refers to the surface of the main body 40 of the lid body 10 that faces the container 101 in the state of the container with lid 150. In describing each part of the lid body 10, for example, with respect to surfaces such as the top surface portion 11, a surface facing in the same direction as the exposed surface 72 of the lid body 10 may be simply referred to as an exposed surface, and a surface facing in the same direction as the opposing surface 73 of the lid body 10 may be simply referred to as an opposing surface.

[0019] The lid 10 has a top surface 11. In the examples shown in FIGS. 1A to 1D, the lid 10 includes a main body 40 having the top surface 11. The main body 40 of the lid 10 further has a bent portion 12 and a side wall portion 13 as needed, as shown in the examples of FIGS. 1A to 1D. The configurations (cross-sectional structures, etc.) of the side wall portion 13, the small wall portion 14, the overlapping portion 20, etc. shown in FIG. 1C and other figures are merely examples and are not limiting. The structure of the overlapping portion 20 (how the small wall portions 14 overlap) may be formed so as to avoid the formation of the cross section shown in FIG. 1C.

[0020] 1A to 1D , the top surface 11 is a portion that covers the opening 102 of the container 101 when the lid 10 is attached (mounted) to the container 101. The shape of the top surface 11 may be determined according to the shape of the container 101, and examples of the shape include a circular shape, an elliptical shape, a triangular shape, a rectangular shape, a polygonal shape, and a chamfered shape.

[0021] (Material of Top Surface Portion) The top surface portion 11 has a sheet-like substrate. The material of the top surface portion 11 (material of the sheet-like substrate) can be paper-based material, plastic, metal, etc., but a paper-based material is preferable from the viewpoint of recyclability and from the viewpoint of achieving both the shape retention of the lid body 10 and environmental consideration (reduced use of petroleum resources). Therefore, it is preferable that the top surface portion 11 has a paper-based substrate 41 (a sheet-like substrate made of a paper-based material) made of a paper-based material. Note that in the example of FIG. 1 , it is preferable that the material of the top surface portion 11, as well as the side wall portion 13 and the curved portion 12, is a paper-based material (i.e., the entire lid body 10 is made of a paper-based material).

[0022] Examples of paper-based materials include so-called paper, which is obtained by weaving a slurry of a fiber raw material onto a screen, drying or pressing it to dry it, and making it into a sheet; so-called air-laid sheets, which are obtained by stacking spread fiber raw materials such as ground pulp obtained by pulverizing a raw material sheet made of pulp-based fibers or the like in a grinder, using an air flow to fix the fibers in the stack to each other with a binder; so-called papers, which are produced by agglutinating plant fibers and other fibers, and sheets of these laminated together; and the like.

[0023] Furthermore, the paper-based material may be composed solely of pulp or may contain non-pulp fibers such as natural, synthetic, or recycled fibers. However, it is preferable for the paper-based material to be primarily composed of pulp (50% by mass or more), more preferably 70% by mass or more, and even more preferably 80% by mass or more, with 100% by mass of pulp being particularly preferred. The paper-based material may also be a composite material with wood-based materials such as wood foil or even aluminum foil. In this case, the composite material preferably contains 50% by mass or more of pulp as a whole, and particularly preferably 80% by mass or more of pulp. The higher the pulp content, the more easily the paper-based material is biodegraded, which is preferable. The material of the lid 10 can also be preferably a laminate containing a paper-based material.

[0024] The paper-based material is a sheet material made of a fibrous raw material, and is preferably one in which the formation of a layer (coat layer) of a coating agent or the like over the entire surface of the sheet material is avoided. By avoiding the formation of a coating layer that covers the entire surface of the sheet material, a lid that is more suitable for recyclability can be formed. However, if a coating agent that can be dissolved in a solvent or the like is used, the formation of a coating layer on the paper-based material is not prohibited.

[0025] In addition to fiber materials such as pulp, paper-based materials are not prohibited from containing various resins as long as they are not the main component. However, when paper-based materials contain various resins, it is preferable to select biodegradable resins that cause less environmental pollution than other resins. Examples of biodegradable resins include microbially produced biodegradable resins such as polyhydroxyalkanoate (PHA) and PHA-based copolymers; natural product-based biodegradable resins such as cellulose derivatives such as cellulose acetate and starch-based resins made primarily 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); chemically synthesized biodegradable resins such as polycaprolactone and polyvinyl alcohol (PVA); and other biodegradable resins such as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product name: Biorecover, trade name: Cra Drop, etc.).

[0026] In addition, in the lid body 10, the top surface portion 11 includes a penetration portion 17 that penetrates the paper-based material, a gas-liquid separating material 42, and a coating agent 48 having thermoplastic properties.

[0027] (Through-through portion) A through-through portion 17 is formed in the top surface 11. In the example of Fig. 1, the through-through portion 17 is formed in a position on the top surface 11 of the main body 40 that is generally closer to the center CT. However, this is just one example, and the position of the through-through portion 17 is not limited to this. The portion that covers the opening 102 is a portion that covers at least a portion of the opening 102, and includes a case where the portion has a partially openable portion such as the insertion port 16, as will be described later.

[0028] The through-hole 17 has a structure (a structure that penetrates) that is cut in the vertical direction (thickness direction of the top surface 11) from one surface of the lid 10 to the other surface (from the exposed surface 72 to the opposing surface 73), and is a so-called cut structure forming portion. The cut structure forming portion is a portion that is formed in a slit shape. The shape of the through-hole 17 is not particularly limited, and although it is formed in a cross shape in the example of FIG. 1, this is only an example and does not limit the shape of the through-hole 17. The shape of the through-hole 17 may be a C-shape, a U-shape, or any other shape.

[0029] The shape of the through-hole 17 is not limited to the slit-like shape described above. The through-hole 17 may be formed in a ring shape. In this case, the through-hole 17 may be a hole portion formed by expanding a member (such as a paper-based material) that forms the main body 40 (a member that forms the top surface 11), or may be a portion formed by punching a member that forms the main body 40.

[0030] (Socket) In the example of Fig. 1, the top surface 11 is formed with a socket 16 for inserting a straw or the like from the outside, and this socket 16 is a structural part formed by the through-hole 17. That is, in the example of Fig. 1, the through-hole 17 forms a structural part that functions as the socket 16 for inserting a straw or the like from the outside.

[0031] The through-hole 17 is not limited to a structure that forms the insertion port 16, but may also be a structure that forms a vent hole that reduces the internal pressure of the container 101 when the container 150 is in the state of a lidded container. However, this does not include a structure that forms an opening (an opening formed inside the top surface 11) for forming a drinking spout as described below (a structure having a small opening and a small lid that can open and close the small opening).

[0032] The lid 10 includes a gas-liquid separator 42 on the top surface 11 of the main body 40. The gas-liquid separator 42 functions as a breathable sheet. The gas-liquid separator 42 is disposed at least on the top surface 11, on the side of the surface 73 facing the container 101. The breathable sheet refers to a sheet that is breathable enough to allow gases such as carbon dioxide and vapors (water vapor, etc.) to pass through from the surface facing one side of the breathable sheet (the opposing surface 73 of the lid 10) to the surface facing the other side (the exposed surface 72 of the lid 10) (the surface facing the main body 40). Gases such as carbon dioxide and vapors (water vapor, etc.) are sometimes collectively referred to as "gases, etc."

[0033] (Gas-liquid separation material) The gas-liquid separation material 42 is a sheet material capable of separating a gas phase gas and at least a part of a liquid phase liquid from a mixed fluid having a gas phase and a liquid phase. As the sheet material constituting the gas-liquid separation material 42, a paper-based breathable sheet 43 is suitably used.

[0034] (Paper-based breathable sheet) The paper-based breathable sheet 43 is a sheet (fiber sheet) that contains fibers 43A and has breathability. The fibers of the paper-based breathable sheet 43 preferably contain long fibers. From the viewpoint of strength, it is preferable that the paper-based breathable sheet 43 contains long fibers as the main component. When the paper-based breathable sheet 43 contains long fibers, paper fibers are preferably used as the long fibers. "Mainly composed of" means that 50% by mass or more of the fibers that make up the paper-based breathable sheet are long fibers.

[0035] The fibers 43A forming the paper-based breathable sheet 43 are preferably so-called paper fibers (pulp fibers). Therefore, the gas-liquid separation material is preferably a material that can be called gas-liquid separation paper. Examples of pulp fibers include wood pulp fibers and non-wood pulp fibers. For both wood pulp and non-wood pulp, virgin pulp is preferred from the viewpoint of maintaining a relatively long fiber length. Furthermore, among wood pulps, unbleached kraft pulp (UKP), bleached kraft pulp (BKP), or a combination thereof is preferred, as these wood pulps produce base paper with excellent wet strength. Unbleached pulp refers to unbleached wood pulp. Bleached pulp refers to wood pulp that has undergone a bleaching process. Examples of bleaching methods for bleached pulp include bleaching methods using alkali, chlorine, sodium hypochlorite, etc., bleaching methods using chlorine dioxide, etc. (ECF (Elementary Chlorine Free) bleaching method), bleaching methods using oxygen, hydrogen peroxide, ozone, etc. (TCF (Total Chlorine Free) bleaching method), etc. Examples of non-wood pulp include linter pulp, kenaf pulp, bagasse pulp, pambu pulp, and hemp pulp.

[0036] Furthermore, the term "long fibers" refers to fibers having a fiber length (typically about 1 mm) or greater than that of hardwood pulp (L-wood), which is a relatively short fiber among the pulp fibers typically used to form paper. Among these pulp fibers, wood pulp fibers obtained from softwood pulp (N-wood) are preferred as long fibers in order to obtain a paper-based breathable sheet with excellent wet strength. However, the fibers 43A contained in the paper-based breathable sheet 43 may be made of a material having an average fiber length equal to or less than that of hardwood pulp (L-wood). This does not completely exclude the inclusion of fibers 43A shorter than the long fibers. In other words, the paper-based breathable sheet 43 may also contain short fibers having a fiber length shorter than that of the long fibers. Specifically, for example, the paper-based breathable sheet preferably contains softwood pulp fibers, but the inclusion of hardwood pulp fibers is not necessarily excluded.

[0037] (Nonwoven Fabric Sheet) A nonwoven fabric sheet is preferably used for the paper-based breathable sheet 43. A nonwoven fabric sheet is defined as a nonwoven fabric in JIS L0222 as "a material in which fibers are oriented in one direction or randomly and are bonded by entanglement and / or fusion and / or adhesion, excluding paper, woven fabric, knitted fabric, tufted fabric, and felted felt." The nonwoven fabric constituting the paper-based breathable sheet 43 is obtained by filtering the fibers described above (such as pulp fibers) using water or the like. The use of nonwoven fabric for the paper-based breathable sheet 43 reduces manufacturing costs and makes it easier to ensure gaps between adjacent fibers 43A.

[0038] (Liquid-repellent agent) The gas-liquid separating material 42 has a structure in which a liquid-repellent agent 44 capable of imparting liquid-repellency to the paper-based breathable sheet 43 is disposed on at least one surface of the paper-based breathable sheet 43. A structure in which the liquid-repellent agent 44 is disposed on the paper-based breathable sheet 43 refers to a structure in which the liquid-repellent agent 44 is in contact with the fibers that form the paper-based breathable sheet 43, as shown in FIG. 2B . At least a portion of the liquid-repellent agent 44 is adhered to at least a portion of the long fibers. From the viewpoint that the fibers 43A that form the paper-based breathable sheet 43 are preferably mainly composed of long fibers, it is preferable that the gas-liquid separating material 42 has the liquid-repellent agent 44 adhered to the long fibers of the paper-based breathable sheet 43.

[0039] The liquid repellent agent 44 is not limited to being disposed on the surface of the paper-based breathable sheet 43 or on the fibers 43A located in the vicinity thereof, but may also be disposed inside the paper-based breathable sheet 43 (at a position inside the surface along the thickness direction of the paper-based breathable sheet 43). In this case, even if part of the liquid contained in the mixed fluid penetrates slightly inside the paper-based breathable sheet 43, the passage of the liquid can be restricted.

[0040] The liquid repellent agent 44 may be attached to the fibers 43A to such an extent that it can maintain close contact with the fibers 43A. In the example of Fig. 2B, the liquid repellent agent 44 is attached in granular form to the surfaces of the fibers 43A, but as shown in Figs. 2C and 2D, the liquid repellent agent 44 may be attached so as to spread in the planar direction of the surfaces of the fibers 43A, or so as to form a layer of the liquid repellent agent 44 that covers the surfaces of the fibers 43A. Furthermore, the liquid repellent agent 44 may penetrate not only the surfaces of the fibers 43A but also the interiors of the fibers 43A (not shown).

[0041] (Type of Liquid Repellent Agent) The liquid repellent agent 44 is preferably determined according to the type of liquid contained in the container 101 in the state of the lidded container 150. When the liquid contained contains water, a water repellent agent is preferably used as the liquid repellent agent 44. The water repellent agent is not particularly limited, but may be a fluorine-based water repellent agent, a silicone-based water repellent agent, wax, or the like.

[0042] (Method of applying water repellent agent as liquid repellent agent) The method of applying the water repellent agent can be a method of applying a water repellent treatment to a paper-based breathable sheet. The method of water repellent treatment is not particularly limited, and can be, for example, a method of immersing a paper-based breathable sheet in a treatment liquid, pulling up the immersed paper-based breathable sheet, and then drying it. Another method of water repellent treatment can be a method of applying a treatment liquid to the surface of a paper-based breathable sheet. Specific examples of application methods include printing methods. Examples of printing methods include coating methods such as roll coating and spray coating, gravure printing, and screen printing.

[0043] (Position of gas-liquid separator) In the lid 10, the gas-liquid separator 42 is arranged so as to cover at least a portion of the through-hole 17 in a plan view of the top surface 11. This makes it possible to create a state in which the gas-liquid separator 42 is arranged between the space 105 of the container 101 and the through-hole 17, and makes it possible to reduce the risk of the mixed fluid of the contents contained in the container 101 directly reaching the through-hole 17 even if it moves upward.

[0044] (Notch) It is preferable that the gas-liquid separating material 42 has a notch 45 formed at a predetermined position corresponding to the through-hole 17. However, this does not prohibit the notch 45 from being omitted from the gas-liquid separating material 42 in the lid 10. In the lid-equipped container 150, when a straw or the like is inserted from the outside using the through-hole 17 as the insertion port 16, the tip of the straw or the like that has passed through the through-hole 17 can easily pass downward through the gas-liquid separating material 42 from the position of the notch 45 in the gas-liquid separating material 42. Note that in the example of FIG. 1 , the notch 45 is located at or near the center of the insertion port 16, but as long as the structure allows the tip of the straw or the like to pass through the gas-liquid separating material 42, the notch 45 may be formed at a position away from the center of the insertion port 16, as shown in FIG. 3A . 1, the cutout 45 is formed in a straight line, the through-hole 17 forming the insertion port 16 is formed in a cross shape, and the cutout direction of the cutout 45 is offset from the cutout direction of the through-hole 17 (out of phase with each other). This reduces the risk of the mixed fluid in the container 101 passing through the cutout 45 and then further passing through the through-hole 17. Note that, in order to reduce the risk of the mixed fluid in the container 101 passing through the cutout 45, it is preferable that the gas-liquid separator 42 has a half-cut portion 46 formed therein, as shown in FIG. 3B, instead of the cutout 45. The half-cut portion 46 is formed in the gas-liquid separator 42 at a position determined to correspond to the through-hole 17.

[0045] Furthermore, the shape of the cutout 45 is not limited to being different from the shape of the through-hole 17 that forms the socket 16, and the shape of the cutout 45 may be the same as the shape of the through-hole 17 that forms the socket 16, as shown in Figures 5A to 5C. However, even in this case, it is preferable that the cutting direction of the cutout 45 is shifted from the cutting direction of the through-hole 17 (directions that are out of phase with each other), as shown in Figures 5A to 5C (in Figures 5A to 5C, the cutting direction of the cutout 45 rotated 45 by 45 degrees within the plane of the top surface 11 becomes the cutting direction of the through-hole 17). Note that when the shape of the cutout 45 is different from the shape of the through-hole 17 that forms the socket 16, the shape of the cutout 45 may not partially or completely match the shape of the through-hole 17 that forms the socket 16. For example, the notch 45 may be formed as a curved notch (for example, C-shaped), and the through-hole 17 forming the insertion port 16 may be formed as a linear notch (for example, cross-shaped).

[0046] (Inter-fiber gaps) The gas-liquid separating material 42 maintains its breathability even when the liquid repellent agent 44 is attached to the fibers 43A of the paper-based breathable sheet 43, and inter-fiber gaps 47 exist between adjacent fibers 43A. In the lid 10, these inter-fiber gaps 47 are formed to allow the infiltration of a coating agent 48, which will be described later.

[0047] (Coating Agent) In the lid 10, a coating agent 48 bonds the gas-liquid separating material 42 and the paper-based substrate 41. The coating agent 48 does not need to be provided in a particular area on the top surface 11 of the main body 40 so as to be able to fix the gas-liquid separating material 42. However, from the viewpoint of ensuring recyclability, it is preferable that the coating agent 48 be provided in a limited area on the opposing surface 73 of the top surface 11 of the main body 40. The area on which the coating agent 48 is provided is determined to correspond to the area where the gas-liquid separating material 42 is disposed. In the example shown in FIGS. 1A to 1D , the area on which the coating agent 48 is provided is determined as an annular area slightly inside the outer periphery of the gas-liquid separating material 42 and outside the area corresponding to the through-hole 17. However, this is just one example, and the area on which the coating agent 48 is provided may be non-annular as long as it is able to bond the gas-liquid separating material 42 and the paper-based substrate 41. However, from the viewpoint of preventing the mixed fluid from penetrating between the gas-liquid separating material 42 and the paper-based substrate 41 from the outer peripheral edge of the gas-liquid separating material 42, it is preferable that the region on which the coating agent 48 is provided be annular. From the viewpoint of adhering the gas-liquid separating material 42 and the paper-based substrate 41, it is also possible to provide the coating agent 48 on the entire surface of the region where the gas-liquid separating material 42 and the paper-based substrate 41 face each other. However, in this case, the entire surface of the gas-liquid separating material 42 is fixed by the coating agent 48, which tends to reduce the cushioning properties of the gas-liquid separating material 42. When the flow velocity of the mixed fluid is high, it is possible that some of the liquid contained in the mixed fluid may pass through the gas-liquid separating material 42. From this viewpoint, it is also preferable that the region on which the coating agent 48 is provided be a partial region, such as an annular region. In the example of FIG. 1 , a non-bonded portion 82 exists inside the region on the lid 10 on which the coating agent 48 is provided when viewed from above (when the line of sight is in the Z-axis direction). In the non-bonded portion 82, a gap 83 may exist between the top surface portion 11 and the gas-liquid separation material 42, or the top surface portion 11 and the gas-liquid separation material 42 may be in contact (the gap 83 may be omitted).

[0048] (Type of Coating Agent) The type of coating agent 48 is not particularly limited as long as it has thermoplastic properties, and examples thereof include thermoplastic resins. Specific examples of coating agents include polyethylene (PE) and polyethylene terephthalate (PET). Because the coating agent has thermoplastic properties, the gas-liquid separation material 42 and the paper-based substrate 41 can be bonded via the coating agent 48 using a heat sealing method, ultrasonic bonding, or the like. The portion where the gas-liquid separation material 42 and the paper-based substrate 41 are bonded is referred to as a separation paper bonded portion 49. From the perspective of reducing the use of plastic materials, it is preferable that the coating agent be made of a non-plastic resin.

[0049] (Strength of Separation Paper Joint) In the lid body 10, the gas-liquid separation material 42 preferably has inter-fiber gaps 47 formed therein as described above, and the separation paper joint 49 preferably has a structure in which the coating agent 48 penetrates into the inter-fiber gaps 47. The extent to which the coating agent 48 penetrates into the inter-fiber gaps 47 at the separation paper joint 49 is preferably such that, when an attempt is made to separate the gas-liquid separation material 42 and the coating agent 48 at room temperature and normal pressure (25°C, 1 atmosphere), the gas-liquid separation material 42 and / or the coating agent 48 are destroyed (internal destruction). The strength of the coating agent 48 and the paper-based substrate 41 is also preferably such that, when an attempt is made to separate the paper-based substrate 41 and the coating agent 48 at room temperature and normal pressure (25°C, 1 atmosphere), the paper-based substrate 41 and / or the coating agent 48 are destroyed. Therefore, it is preferable that the bonding strength of the portion where the gas-liquid separating material 42 and the paper-based substrate 41 are bonded at the separation paper joint 49 is not strong enough to cause interlayer delamination between the gas-liquid separating material 42 and the coating agent 48 or between the paper-based substrate 41 and the coating agent 48 at room temperature and normal pressure (25°C, 1 atmosphere), but is strong enough to cause destruction of each part, such as the gas-liquid separating material 42, the paper-based substrate 41 and the coating agent 48.

[0050] In the example of the lid body 10 shown in Figures 1A to 1D, as described above, the main body 40 has a side wall portion 13 and a curved portion 12 in addition to the top surface portion 11, and the top surface portion 11 and the side wall portion 13 are continuous at the curved portion 12.

[0051] (Bending Portion) The bending portion 12 is formed so as to surround the outer periphery of the top surface portion 11, and is a portion that forms the boundary between the top surface portion 11 and the side wall portion 13. The bending portion 12 is formed so that the side wall portion 13 faces the side wall 104 and edge portion 103 of the container 101 when the lid 10 is attached to the container 101. In the examples shown in FIGS. 1A to 1D , the bending portion 12 has a bent structure, but as will be described later, the bending portion 12 is not limited to having a bent structure. Furthermore, the "portion that forms the boundary between the top surface portion 11 and the side wall portion 13" includes both a case where the portion itself forms the boundary and a case where a boundary is defined inside or at the end of the portion (a case where a part of the top surface portion 11 and / or the side wall portion 13 also serves as the bending portion 12). 1A to 1D, the curved portion 12 is formed at the boundary between the top surface 11 and the side wall 13, and the top surface 11 and the side wall 13 are defined by the curved portion 12. The boundary between the top surface 11 and the side wall 13 is determined at the center of the curved portion 12. When the curved portion 12 has a curved structure as will be described later using Figures 8A and 8B, etc., the curved portion 12 is configured by a portion specified by the curved range, and the boundary between the top surface 11 and the side wall 13 is determined approximately at the center of the curved portion 12. This also applies to the case where the curved portion 12 is formed by a protruding portion 226, which will be described later.

[0052] (Side Wall Portion) The side wall portion 13 is formed in an annular shape along the outer peripheral edge 11A of the top surface portion 11. The side wall portion 13 has a plurality of small wall portions 14 (described later) and has an overlapping portion 20 where adjacent small wall portions 14 partially overlap. The overlapping portion 20 has a small wall joint portion 15 that joins adjacent small wall portions 14.

[0053] 1A to 1D, the overall shape of the side wall portion 13 is tapered in the vertical direction from the bending portion 12 toward the front end of the small wall portion 14 (-Z direction). The tapered shape referred to here indicates a shape in which, in a plan view of the lid 10, a cross section of the side wall portion 13 (a cross section of the side wall portion 13 that can also be seen when the side wall portion 13 is cut along a plane parallel to the XY plane) is formed inside the cross section of the side wall portion 13 near the bending portion 12 at a predetermined position below the bending portion 12; in the examples of FIGS. 1A to 1D, the cross section of the side wall portion 13 is formed to become smaller the further away from the bending portion 12 it is. The shape of the side wall portion 13 may be a shape for the inner peripheral surface 13A of the side wall portion 13 or a shape for the outer peripheral surface 13B of the side wall portion 13, but it is preferable that either shape corresponds to a tapered shape, as shown in the examples of Figures 1A to 1D.

[0054] (Small Wall Portion) The cover 10 has a plurality of small wall portions 14, which are formed to be continuous with the top surface portion 11 via the bent portion 12. Each small wall portion 14 has a base end portion 31 and a front edge portion 32, with the base end portion 31 located at the bent portion 12 and the front edge portion 32 forming the lower end of the side wall portion 13. In the example of Figures 1A to 1D, the base end portion 31 forms the upper end of the side wall portion 13, but this is just an example.

[0055] The outer periphery of each small wall portion 14, excluding the base end portion 31 and the front end portion 32, forms a side end portion 33. The shape of the side end portion 33 is not particularly limited as long as it can form the overlapping portion 20 described below. However, it is preferable that one side end portion 33 of adjacent small wall portions 14 and the other side end portion 33 facing that side end portion 33 are parallel to each other in a blank 50 described below. In the example of FIG. 1, the side end portion 33 is linearly shaped extending outward (in the radial direction of the blank 50) from the center of the blank 50 (position CB in FIG. 7A) in a plan view of the blank 50 described below. The small wall portion 14 is composed of individual fold margins 51 in the blank 50 described below. In the example of FIG. 7A, when the blank 50 is shaped to form the lid 10 of FIG. 1A, the center CB of the blank 50 is approximately the same as the center CT of the lid 10.

[0056] The small wall portions 14 are formed to surround the outer peripheral edge 11A of the top surface portion 11. That is, the multiple small wall portions 14 are formed to be aligned in the circumferential direction of the top surface portion 11 along the curved portion 12. Adjacent small wall portions 14 in the circumferential direction of the top surface portion 11 partially overlap each other. The overlapping structure of adjacent small wall portions 14 may be the same for all of the small wall portions 14 aligned in the circumferential direction of the top surface portion 11. For example, of the side end portions 33 of the small wall portions 14, the side end portion 33 on the −X direction side in FIG. 1B is defined as the first side end portion 33A, and the side end portion 33 on the +X direction side is defined as the second side end portion 33B (the first side end portion 33A and the second side end portion 33B are defined so that the direction from the first side end portion 33A toward the second side end portion 33B when viewing the side end portions 33 of the small wall portions 14 coincides with the clockwise direction around the circumferential direction of the top surface portion 11). 1, the overlapping structure of adjacent small wall portions 14 is determined so that the first side end portion 33A is located on the inner circumferential surface 13A side of the side wall portion 13, and the second side end portion 33B is located on the outer circumferential surface 13B side of the side wall portion 13. Note that this is just an example and does not limit the overlapping structure of adjacent small wall portions 14.

[0057] 1B and 1D , small wall portion 14 has an inner surface portion 34 that faces container 101 when attached to container 101, and an outer surface portion 35 that faces the opposite side of inner surface portion 34, and the exposed portion of inner surface portion 34 of small wall portion 14 forms inner circumferential surface 13A of side wall portion 13. Also, in the examples of Figures 1B and 1D , the exposed portion of outer surface portion 35 of small wall portion 14 forms outer circumferential surface 13B of side wall portion 13.

[0058] The shape of the small wall portion 14 is not particularly limited, but it is preferable that at least a portion of the small wall portion 14 has a shape in which the width is greater at the front edge 32 than at the base end 31. In this case, as shown in the example of Fig. 1B, it is preferable that the width WN of the small wall portion 14 gradually increases from the base end 31 toward the front edge 32. An example of such a shape of the small wall portion 14 is a fan shape.

[0059] The small wall portion 14 preferably has a resin layer (preferably a thermoplastic resin layer) formed on the surface of at least one side of the inner surface portion 34 and the outer surface portion 35. In this case, the small wall joint portion 15 can be easily formed in the overlapping portion 20 by performing a heat treatment, ultrasonic welding, or the like when forming the lid body 10 from the blank piece 50 described below. This can be achieved by using a sheet material having a resin layer formed on at least one surface as the material for the lid body 10 (as the material for the blank piece 50). Specific examples of the sheet material include those having a laminate structure of a layer formed of a paper-based material (e.g., paper) and a resin layer (e.g., coated paper).

[0060] (Overlapping portion) An overlapping portion 20 is formed in the side wall portion 13. The overlapping portion 20 is a portion defined by a structure in which adjacent small wall portions 14 partially overlap each other. In the example of Figures 1A to 1D, as described above, if, of the surfaces constituting the small wall portions 14, the surface facing the container 101 when attached to the container 101 is defined as the inner surface portion 34, and the surface opposite the inner surface portion 34 is defined as the outer surface portion 35, the overlapping portion 20 is defined as the portion where the inner surface portion 34 of one small wall portion 14 faces the outer surface portion 35 of the other small wall portion 14. In the examples of Figures 1A to 1D, when the adjacent small wall portions 14 are defined as a first small wall portion 14A and a second small wall portion 14B (for example, when the first small wall portion 14A and the second small wall portion 14B are defined so that the direction from the first small wall portion 14A to the second small wall portion 14B is clockwise), the inner surface portion 34 of the first small wall portion 14A faces the outer surface portion 35 of the second small wall portion 14B.

[0061] The overlapping portion 20 preferably has a region where the width increases from the base end 31 toward the front edge 32 of the small wall 14. In the examples shown in FIGS. 1A to 1D , the overlapping portion 20 has a shape where the width WK of the overlapping portion 20 gradually increases from the base end 31 toward the front edge 32 of the small wall 14. Forming the overlapping portion 20 in this manner facilitates forming the formation region of the small wall joint 15 (described later) to be similar to the overlapping portion 20, thereby facilitating the formation of a structure that enhances the effect of the small wall joint 15. The width of the overlapping portion 20 (width WK in FIG. 1B ) refers to the length of the region along the surface of the overlapping portion 20 in the direction parallel to a straight line M connecting the two ends 31A, 31B of the base end 31 of the small wall 14.

[0062] (Small Wall Joint) In the overlapping portion 20, the opposing surfaces of the small walls 14 constituting the overlapping portion 20 are joined together, forming a small wall joint 15. In the example shown in FIGS. 1A to 1D, this joint is defined as the joint between the outer surface 35 of the first small wall 14A and the inner surface 34 of the second small wall 14B. The formation of the small wall joint 15 prevents adjacent small walls 14 from moving freely relative to each other, facilitating the stabilization of the overall shape of the side wall 13. In particular, unlike conventional wrinkled structures such as fine wrinkles or creases formed by densely packing the blank material through shaping, the small wall joint 15 is a surface-jointed portion, which facilitates the stabilization of the shape of the side wall 13. Note that this does not prohibit the formation of a conventional wrinkled structure in addition to the small wall joint 15.

[0063] The formation area of ​​the small wall joint 15 is not particularly limited, as long as it is an area that can prevent the small wall 14 constituting the side wall 13 from freely rotating about the base end 31. However, from the viewpoint of maintaining the shape stability of the lid 10, making it difficult for the side wall 13 to deform at positions far from the bend 12 (positions close to the lower end of the side wall 13), and allowing the side wall 13 to deform relatively closer to the bend 12 than to the lower end of the side wall 13, it is preferable that the width WD of the small wall joint 15 has a portion that increases from the bend 12 toward the front end of the small wall 14. In this case, it is preferable that the formation area of ​​the overlapping portion 20 be the same. In this case, the overlapping portion 20 and the small wall joint 15 can be formed substantially simultaneously by subjecting the overlapping portion 20 to a heat fusion treatment (heat treatment, etc.) or ultrasonic welding treatment in conjunction with the formation of the overlapping portion 20. The width of the small wall joint 15 (width WD in FIG. 1 ) refers to the length of the region along the surface of the small wall joint 15 in the direction parallel to the above-mentioned straight line M. The structure in which the opposing surfaces of the small wall portions 14 that form the small wall joint 15 are joined together is formed as a part by fixing the small wall portions 14 by adhesive or the like. Specifically, an adhesive or resin (thermoplastic resin) may be placed on at least one of the opposing small wall portions 14 in a portion that corresponds to at least a part of the overlapping portion 20, and the part may be fixed via the adhesive or resin.

[0064] 1A to 1D, the width WD of the small wall joint 15 gradually increases from the base end 31 toward the front edge 32 of the small wall 14. An example of the formation region of such a small wall joint 15 is a generally fan-shaped formation region (a shape in which two fan shapes are partially overlapped).

[0065] 1A to 1D, in the present invention, the lid 10 has a three-dimensional shape as a whole due to the different surface directions of the top surface 11 and the side wall 13. Such a three-dimensional shape of the lid 10 can be realized, for example, by using a molding device or the like to deform (shape) the lid blank into a shape corresponding to the shape of the lid 10. In this specification, the lid blank may be simply referred to as a blank.

[0066] (Lid blank) The lid blank (blank 50) is a blank 50 that corresponds to the lid 10. For example, the blank 50 for the lid 10 shown in the example of FIGS. 1A to 1D is composed of a sheet-like structure formed into a shape determined according to the lid 10. The material of the blank 50 is determined to be the same as the material of the lid 10. Note that when the blank 50 is sheet-like, it includes blanks that have penetrations 17, tab members 19, etc., provided at positions that correspond to the shape and configuration of the lid 10, as will be described later.

[0067] 7A , the blank 50 has a first corresponding portion 52 and a second corresponding portion 53. The portion of the blank 50 that corresponds to the portion that will become the top surface 11 of the lid 10 is the first corresponding portion 52, and the portion that corresponds to the portion that will become the side wall 13 is the second corresponding portion 53.

[0068] As shown in FIG. 7A , the blank 50 corresponding to the lid 10 shown in FIG. 1A may be formed from a sheet material in which a gas-liquid separator 42 is disposed on a circular sheet 55 serving as a paper-based substrate 41. The blank 50 has a plurality of cuts 54 extending inward from the outer periphery of the sheet 55. In the example shown in FIG. 7A , the portion between adjacent cuts 54 along the outer periphery of the sheet 55 forms a fold margin 51 that is bent when the blank 50 is shaped. A portion formed by a combination (assembly) of the fold margins 51 forms a second corresponding portion 53. When the fold margin 51 is bent in the direction of arrow FD as shown in FIG. 7B , the fold margin 51 forms the minor wall 14 (or forms part of the minor wall) when the blank 50 is transformed into the lid 10. 7A and the like are one example of the blank material 50, and the blank material 50 may be configured to be folded at a predetermined position further toward the center than the innermost end of the cut portion 54, for example.

[0069] (Lid Manufacturing Method) The lid 10 can be manufactured, for example, by shaping the blank 50 into a shape corresponding to the shape of the lid 10 using a lid molding device or the like. An example of the lid molding device is a device having a pair of male and female molds (not shown). The blank 50 can be shaped by separating the male and female molds, placing the blank 50 between them, and clamping the molds. At this time, the blank 50 is folded at or near the inner end of the second corresponding portion 53 (the boundary between the first corresponding portion 52 and the second corresponding portion 53), forming an overlapping structure (overlapped portion 20) with adjacent fold margins 51, as shown in FIG. 7D . Conditions such as the width of the overlapped portion 20 can be determined by adjusting the mold shape, the control of the lid molding device, etc. By shaping the blank 50, the first corresponding portion 52 becomes the top surface 11, and the second corresponding portion 53 becomes the side wall portion 13. 7A, the folding margin portion 51 forming the second corresponding portion 53 becomes the small wall portion 14. In this example, the boundary between the first corresponding portion 52 and the second corresponding portion 53 generally becomes the bent portion 12.

[0070] In addition, when the side wall portion 13 of the lid body 10 has a tapered shape as shown in FIG. 1, it is preferable that at least one of the male mold and the female mold is a separable mold from the viewpoint of realizing mold clamping.

[0071] Furthermore, from the viewpoint of forming the minor wall joint 15 simultaneously with shaping the blank 50, it is preferable that the lid forming device be provided with a joining mechanism for forming the minor wall joint 15. Examples of the joining mechanism include a heating mechanism configured to perform a heat treatment that heats at least a portion of the overlapping portion 20, and an ultrasonic welding mechanism configured to perform an ultrasonic welding treatment on a portion of the overlapping portion 20. Note that, from the viewpoint of forming the minor wall joint 15 by heat treatment, it is preferable that an adhesive or resin be placed in the portion that forms the overlapping portion 20 in advance at a stage prior to the heat treatment.

[0072] [1-3 Actions and Effects] The lid attached to the container has a penetration formed in the top surface, and when the container contains liquid while the lid is in the lidded state, there is a risk that a mixed fluid containing liquid and gas will leak out of the container through the penetration. In particular, when the liquid contained in the lidded container is hot or carbonated, the lidded container will be filled with gases such as steam and carbon dioxide, and these gases will spray out through the penetration in the lid. When the lidded container is moved, the movement of the liquid inside the container can cause the liquid surface to ripple, and some of the rippled liquid can be caught in the flow of gas trying to spray out of the container, being blown up along with the gas and spraying out through the penetration.

[0073] Furthermore, in terms of lids, there is a demand for reducing the use of petroleum-based materials in order to reduce the environmental impact, and there is a demand for using paper-based materials as much as possible in order to reduce the use of petroleum-based materials. Also, from the viewpoint of reducing the environmental impact, it is important to improve the recyclability of lids. Therefore, there is a demand for lids that can prevent leakage of contents from containers with lids while using paper-based materials and that have improved recyclability.

[0074] The lid 10 of the present invention has a special configuration for separating the gas FGA and the liquid FLI from the mixed fluid FW, thereby preventing leakage of the contents from the lidded container 150. For example, as shown in FIG. 2A , when the mixed fluid FW collides with the gas-liquid separating material 42 from inside the container 101, the gas FGA passes through the inter-fiber gaps 47 of the gas-liquid separating material 42 and proceeds to the outside, but the liquid FLI is easily repelled by the liquid repellent agent 44 disposed in the fibers 43A of the gas-liquid separating material 42. The liquid FLI then falls back to the bottom of the container 101 due to its own weight or the like. As a result, the lid 10 makes it possible to separate the gas FGA and the liquid FLI from the mixed fluid FW. Furthermore, even if the momentum of the mixed fluid is strong and the liquid FLI enters the inter-fiber gaps 47 toward the inside of the gas-liquid separation material 42, the liquid FLI collides with the fibers 43A, the droplets are broken up, and the momentum is reduced. If a liquid repellent agent 44 is disposed inside the gas-liquid separation material 42, the liquid FLI will eventually be repelled by the liquid repellent agent 44 inside the gas-liquid separation material 42, and the liquid FLI of the mixed fluid FW will easily drop down to the bottom of the container 101 again due to the weight of the liquid FLI, etc.

[0075] In particular, according to the lid 10 of the present invention, the gas FGA and the liquid FLI are separated by the gas-liquid separator 42, and the top surface 11 is made of a paper-based substrate 41, so that it is possible to create a state in which the pulp fibers are exposed on both sides (the exposed surface 72 and the opposing surface 73) of the lid 10. This allows the pulp fibers to be efficiently opened during recycling, and further allows the resin component and the pulp fibers to be easily separated, making it easy to further improve recyclability with the lid 10 of the present invention.

[0076] 1A to 1D, the side wall 13 has a structure in which a plurality of small wall portions 14 that are continuous with the top surface 11 are partially overlapped, and the top surface 11 and the side wall portion 13 can be formed by shaping a sheet-like blank 50. Furthermore, in the lid of the present invention, the small wall joints 15 extend in the surface direction (circumferential direction) of the side wall portion 13, and therefore, compared to conventional lids that have a pleated or wrinkled structure in the side wall portion, the risk of the side wall portion 13 irreversibly expanding outward even when a force that expands in the surface direction acts on the side wall portion 13 can be reduced. In other words, when the lid body 10 is attached to a container 101 whose dimensions are slightly larger than the size of the inner surface 13A of the side wall portion 13 of the lid body 10, even if a force in a direction that expands the side wall portion 13 (a force that expands the side wall portion 13 in the circumferential direction) acts on the side wall portion 13 of the lid body 10, the side wall portion 13 is unlikely to expand irreversibly, making it easier to maintain the lid body 10 firmly attached to the container 101, and also reducing the risk of the side wall portion 13 of the lid body 10 unintentionally expanding and compromising the airtightness of the lid-equipped container 150.

[0077] In conventional lids having a crease or wrinkle-like structure in the side wall portion, the members constituting the side wall portion are continuous (there are no or few breaks) where the wrinkles are formed. In the lid of the present invention, adjacent small wall portions 14 are cut, and in side wall portion 13, the side end faces of small wall portions 14 form the side ends of overlapping portion 20. Therefore, when a lid of the present invention is formed that has the same cross-sectional diameter as a conventional lid having a crease or wrinkle-like structure in the side wall portion, if the total area of ​​the face-to-face contact region where the members constituting the side wall portion of the conventional lid come into face-to-face contact with each other (the face-to-face contact region where the wrinkles or creases are formed) is defined as ARA1 and the total area of ​​overlapping portion 20 in the lid of the present invention is defined as ARA2, ARA2 will be larger than ARA1. In other words, the total area of ​​the small wall joint 15 formed in the overlapping portion 20 can be made larger than the joint area when wrinkles or folds are joined in a conventional lid body, and in this respect, the lid body of the present invention can stabilize the shape of the side wall portion 13 more than conventional lid bodies.

[0078] [1-4 Modified Examples of Lid] (Modified Example 1) In the lid according to the first embodiment, the shape of the gas-liquid separator 42 is not particularly limited. The gas-liquid separator 42 may be, for example, rectangular as shown in FIGS. 17A to 17C (Modified Example 1). This form is referred to as Modified Example 1 of the first embodiment. FIG. 17A is a plan view illustrating an example of Modified Example 1 of the first embodiment. FIG. 17B is a side view illustrating an example of Modified Example 1 of the first embodiment. FIG. 17C is a cross-sectional view illustrating an example of Modified Example 1 of the first embodiment.

[0079] (Modification 2) In the lid according to the first embodiment, the overlapping structure of the adjacent small wall portions 14 forming the overlapping portion 20 may be different from that shown in FIG. 1.

[0080] (Modification 3) In the lid 10 according to the first embodiment, the bent portion 12 is not limited to having a bent shape (a folded shape), and may have a curved shape.

[0081] (Variation 4) The lid body 10 according to the first embodiment is not limited to the case where the side wall portion 13 is formed to have a tapered shape in a direction away from the bent portion 12 (downward (-Z direction) in Figures 1B and 1C, etc.) as described above (Variation 7). The lid body 10 according to the first embodiment may be formed, for example, so that the side wall portion 13 has a tapered shape. Furthermore, the lid body 10 according to the first embodiment may be formed, for example, so that the side wall portion 13 has a shape with a constant cross-sectional diameter (a shape that is neither tapered nor tapered). The lid body 10 according to the first embodiment may be formed, for example, so that the side wall portion 13 has a partially expanded or partially contracted diameter. In the lid body 10 according to the first embodiment, the side wall portion 13 may have a flared shape (a shape that widens like a trumpet).

[0082] (Variation 5) In the lid 10 according to the first embodiment, as shown in FIGS. 6A and 6B , in addition to the through-hole 17, a drinking spout-forming structure 18 for forming a drinking spout may be formed on the top surface 11 (Variation 5). FIGS. 6A and 6B are plan views illustrating an example of the top surface 11 of the lid 10 according to Variation 5 of the first embodiment. In FIGS. 6A and 6B , the drinking spout-forming structure 18 is formed of a small opening 18A, a small lid portion 18B that covers the small opening 18A, a base portion 18D that forms the periphery of the small opening 18A, and a hinge portion 18C that serves as a rotation axis when lifting the small lid portion 18B. When the small lid portion 18B is lifted from the base portion 18D around the hinge portion 18C, the small opening 18A is exposed. This exposed small opening 18A serves as the drinking spout. When the drinking spout-forming structure 18 is formed, it is preferable that a tab member 19 be attached to the small lid portion 18B, as shown in FIGS. 6A and 6B .

[0083] In the lid body 10 according to the fifth modification of the first embodiment, it is preferable that the gas-liquid separating material 42 is disposed on the underside 11B of the top surface 11, avoiding the small lid portion 18B of the drinking spout-forming structure 18. By disposing the gas-liquid separating material 42 so as to avoid the small lid portion 18B, even when the small lid portion 18B is pulled up around the hinge portion 18C as shown by the dashed line in Figure 6B (in Figure 6B, the small lid portion 18B is pulled up as the tab member 19 is pulled up), it is unlikely that pieces of the fibers 43A of the gas-liquid separating material 42 will be located near the small opening 18A. This makes it unlikely that pieces of the fibers 43A will come into contact with the user's mouth even when the user places their mouth over the small opening 18A, thereby reducing the user's discomfort caused by the fibers 43A coming into contact with the user's mouth.

[0084] (Variation 6) In the case where the lid 10 according to the first embodiment has a curved portion 12 and a side wall portion 13, the curved portion 12 may be formed by a protruding portion 226, as shown in FIGS. 8A and 8B . Furthermore, a convex portion 225 may be formed at or near the end (outer end 228B) of the protruding portion 226 (inner end 228A, outer end 228B) that is closer to the side wall portion 13 (Variation 6). This configuration is referred to as Variation 6 of the first embodiment. FIG. 8A is a plan view showing an example of Variation 6 of the first embodiment. FIG. 8B is a cross-sectional view showing an example of Variation 6 of the first embodiment. In the example shown in FIGS. 8A and 8B , the gas-liquid separator 42 is arranged to face a partial region of the top surface portion 11 and a predetermined region of the top surface portion 11 that includes the through-hole 17.

[0085] (Protruding Portion) In the example of the lid 10 according to the sixth modification of the first embodiment shown in FIGS. 8A and 8B , a protruding portion 226 is formed as a structure (protruding structure) in which a predetermined region on the outer peripheral edge side of the top surface 11 protrudes obliquely upward. However, the protruding direction of the protruding portion 226 may be upward or horizontal (in the planar direction of the top surface 11). Furthermore, the inner surface 226A of the protruding portion 226 forms a sunken portion (sunken portion 227). The shape of the sunken portion 227 corresponds to the shape of the protruding portion 226. This can be achieved depending on the shape of the mold used to form the lid 10 from the blank 50. The size of the sunken portion 227 is preferably large enough to fit over the edge 103 of the container 101. When the recessed portion 227 is of this size, when the lid 10 is used as a lidded container 150, the edge portion 103 largely fits into the recessed portion 227, and the outer end portion of the edge portion 103 (in the example of Figure 20, the outer peripheral portion 111 of the edge portion 103) can be brought into surface contact with the recessed portion 227, making it easy to firmly attach the lid 10 to the edge portion 103 of the container 101.

[0086] (Convex Portion) As shown in the example of FIGS. 8A and 8B , a convex portion 225 may be formed on the side wall portion 13. The convex portion 225 is defined, for example, as a portion that protrudes inward (toward the center CT, in a direction from the outer peripheral surface 13B of the side wall portion 13 toward the inner peripheral surface 13A) at a predetermined position on the side wall portion 13. The convex portion 225 is preferably a convex stripe portion formed around the inner peripheral surface of the side wall portion 13. The convex structure of the convex portion 225 may be formed on the inner peripheral surface of the side wall portion 13, and a concave portion 224 may be formed on the outer peripheral surface 13B of the side wall portion 13 at a position corresponding to the position where the convex structure is formed. Forming such a structure can further stabilize the shape of the side wall portion 13.

[0087] (Variation 7) In the lid 10 according to Variation 6 of the first embodiment, as shown in FIGS. 9A to 9C , the gas-liquid separator 42 may be disposed not only in the top surface 11 but also from the bent portion 12 to the protruding portion 226 and the convex portion 225 (Variation 7). This configuration is referred to as Variation 7 of the first embodiment. FIG. 9A is a plan view showing an example of Variation 6 of the first embodiment. FIG. 9B is a cross-sectional view showing an example of Variation 6 of the first embodiment. FIG. 9C is a diagram showing an enlarged view of the area EI indicated by the dashed-dotted line. In the example of FIGS. 9A to 9C , the gas-liquid separator 42 is continuously disposed from a portion of the top surface 11 facing a predetermined area including the through portion 17 to a region on the inner surface of the protruding portion 226 and a position near the tip of the inner surface of the convex portion 225 (the surface facing the container 101). According to the lid body 10 of the fifth modified example of the first embodiment, when the lid body 10 is used as a container with a lid body 150, the gas-liquid separation material 42 is present between the edge portion 103 of the container 101 and the inner surface 226A of the protrusion portion 226, and the risk of liquid leaking from between the edge portion 103 and the inner surface 226A of the protrusion portion 226 can be more effectively prevented.

[0088] (Variation 8) In the cover 10 according to the first embodiment, the paper-based breathable sheet 43 constituting the gas-liquid separating material 42 may have fibers 43A arranged without any particular general directionality (with their orientation restricted) as shown in the example of Fig. 2A, or may have fibers arranged with the fibers oriented in a generally predetermined direction as shown in the example of Fig. 2B (Variation 8). The form in which the fibers 43A are roughly oriented is referred to as Variation 8 of the first embodiment. Fig. 2B is a diagram showing the gas-liquid separating material 42 in one example of Variation 8 of the first embodiment.

[0089] When the fibers 43A contained in the paper-based breathable sheet 43 constituting the gas-liquid separation material 42 are oriented, the orientation of the fibers 43A may be generally unidirectional or generally multidirectional (e.g., bidirectional) as shown in FIG. 2B . Here, the fibers 43A being oriented in a specific direction is not limited to the case where all of the fibers 43A are aligned in a specific direction as their longitudinal direction, but also includes the case where some of the fibers 43A have their longitudinal direction deviated from the specific direction. Furthermore, the paper-based breathable sheet 43 may have a difference in fiber density (i.e., a difference in fiber density) in terms of the fiber density at different positions in the surface direction of the paper-based breathable sheet 43. Furthermore, when the paper-based breathable sheet 43 has a difference in fiber density (i.e., a difference in fiber density), the surface shape of the paper-based breathable sheet 43 may have an uneven shape, with high fiber density portions forming convex portions and low fiber density portions forming concave portions. In the example of FIG. 2B, the high fiber density portions are formed in a roughly lattice pattern, and low fiber density portions exist around the high fiber density portions.

[0090] (Variation 9) In the lid 10 according to the first embodiment, the area where the coating agent 48 is disposed is not limited to the area where the gas-liquid separator 42 and the top surface 11 face each other. As shown in FIGS. 18A to 18C , the coating agent 48 may also be disposed in an area outside of that area (Variation 9). This configuration is referred to as Variation 9 of the first embodiment. FIGS. 18A to 18C are diagrams showing an example of Variation 9 of the first embodiment. In FIGS. 18A to 18C , the coating agent 48 covers the entire top surface 11 except for the area where the insertion port 16 is formed, and a separation paper joint 49 is formed by joining the gas-liquid separator 42 and the top surface 11 with a portion of the coating agent 48.

[0091] (Variation 10) In the lid 10 according to the first embodiment, when prioritizing recyclability as an effect, it is preferable to minimize the area where the coating agent 48 is disposed. However, when prioritizing the robustness of the lid 10 and the effect of stably adhering the gas-liquid separator 42 to the robust structural portion, the area where the coating agent 48 is disposed is not limited to the area between the gas-liquid separator 42 and one side of the top surface 11. It is also possible for the coating agent 48 to be formed on both sides of the top surface 11, as shown in FIGS. 19A to 19C (Variation 9). This configuration is referred to as Variation 10 of the first embodiment. FIGS. 19A to 19C are diagrams showing an example of Variation 10 of the first embodiment. In FIGS. 19A to 19C, the coating agent 48 is disposed on both the opposing surface 73 and the exposed surface 72 of the top surface 11. Furthermore, the coating agent 48 may be disposed up to the portion corresponding to the side wall portion 13. 19A to 19C, the coating agent 48 is applied to the entire area on both sides of the top surface 11 except for the area where the insertion port 16 is formed, and a separation paper joint 49 is formed by joining the gas-liquid separation material 42 and the top surface 11 with a part of the coating agent 48. Note that, regardless of Modification Example 10, from the viewpoint of recyclability, even when the coating agent 48 is applied to both sides of the top surface 11, it is preferable that there be an area on the top surface 11 where the coating agent 48 is not applied.

[0092] [2 Second Embodiment] [2-1 Configuration] As illustrated in FIGS. 10A and 10B , the lid 10A according to the second embodiment has a top surface 11, a curved portion 12, and a side wall 13. The top surface 11 is provided with a through-hole 17 and a gas-liquid separator 42, but these are similar to those in the first embodiment and will not be described here. FIGS. 10A and 10B are perspective and cross-sectional views showing an example of a lid according to the second embodiment. In FIG. 10B , reference numeral 274 corresponds to a portion that contacts the edge 103 of the container 101 when attached to the container 101. Reference numeral 274A indicates the portion where the top surface 11 and the edge 103 contact, and reference numeral 274B indicates the portion where the side wall 13 and the edge 103 contact. This also applies to FIGS. 11 to 13 .

[0093] In the lid 10A according to the second embodiment, the side wall 13 is formed in an annular shape along the outer peripheral edge of the top surface 11, and the small wall 14 and overlapping portion 20 shown in the first embodiment are omitted. The side wall 13 is formed so as to taper downward (toward the −Z direction) (the inner diameter of the cross section becomes smaller (narrower)), but as explained in the first embodiment, the tapered shape of the side wall 13 is merely a preferred example, and the shape of the side wall 13 is not limited to this.

[0094] The lid body 10A of the second embodiment can be specifically manufactured by forming the top surface portion 11 and the side wall portion 13 from separate members, and further bonding the member forming the top surface portion 11 to the member forming the side wall portion 13.

[0095] For example, in a forming example of the lid 10A of the second embodiment, as shown in Figures 14A and 14B, a canopy-forming member 222 having a first portion 231 for forming the top surface 11 and a sidewall-forming member 223 for forming the sidewall 13 are prepared. A joint margin 230 configured to be joinable to the sidewall-forming member 223 as a second portion 232 is extended from the outer end (outer edge) of the first portion 231 of the canopy-forming member 222. The joint margin 230 of the canopy-forming member 222 is adhered to the upper end of the sidewall-forming member 223, thereby joining the canopy-forming member 222 and the sidewall-forming member 223, thereby forming the bent portion 12. At this time, the lid 10 is formed. In this case, as shown in Figures 14A and 14B, blanks for forming the canopy-forming member 222 and the sidewall-forming member 223 (referred to as a first blank 251 and a second blank 252, respectively) can be used. The first blank 251 for forming the canopy-forming member 222 may be a sheet material formed to a shape that matches the shape of the top surface 11 with a joint margin 230. The first blank 251 preferably has a through-hole 17 and a gas-liquid separator 42. The second blank 252 is shaped to match the shape of the sidewall 13. For example, if the sidewall 13 has a shape that narrows or widens toward its tip, a sheet material formed in a fan shape (partial fan shape) may be used. The sidewall-forming member 223 that forms the sidewall 13 can be obtained by joining the end edges 253, 253 of the second blank 252.

[0096] [2-2 Actions and Effects] According to the lid body 10A of the second embodiment, similar to the first embodiment, it is possible to obtain a lid body that can suppress leakage of the liquid that constitutes the mixed fluid from the through-hole 17 and has excellent recyclability.

[0097] [3 Third Embodiment] [3-1 Configuration] As shown in Figures 11A and 11B, the lid 10B according to the third embodiment is similar to that of the first embodiment in that it has a top surface 11 and a side wall 13 and can be fitted to a container 101. In the third embodiment, the top surface 11 is provided with a through-hole 17 and a gas-liquid separator 42, but these may be similar to those of the first and second embodiments, and therefore their description will be omitted. Figures 11A and 11B are a perspective view and a cross-sectional view showing an example of a lid according to the third embodiment.

[0098] The cover 10B according to the third embodiment has a configuration in which a portion of the side wall 13 extends above and below the top surface 11. The side wall 13 has an annular (including cylindrical) shape and includes an upper wall 205 and a lower wall 206. The lower wall 206 is a portion that extends below the top surface 11, and the upper wall 205 is made up of the portion of the side wall 13 excluding the lower wall 206. In the example shown in FIGS. 11A and 11B, the side wall 13 is tapered downward. Also, in the example shown in FIGS. 11A and 11B, a through-hole 17 is formed at a predetermined position on the top surface 11, but this is just one example.

[0099] (Members forming the canopy and side wall) In the third embodiment, as in the second embodiment, the top surface 11 and the side wall 13 are formed from separate members. In the example of Figures 11A and 11B, the lid 10B has a canopy-forming member 222 and a side wall-forming member 223 as the separate members described above, and has a joint that joins the canopy-forming member 222 and the side wall-forming member 223.

[0100] (Canopy-forming member) Canopy-forming member 222 has a first portion (first portion 231 of canopy-forming member 222) corresponding to top surface 11 and a second portion (second portion 232 of canopy-forming member 222) extending from the outer peripheral edge of first portion 231, with second portion 232 forming joint margin 230 shown in the second embodiment. In the example of Figure 11A, second portion 232 of canopy-forming member 222 is a portion (rising portion) that rises diagonally or vertically upward from the outer peripheral edge of first portion 231 in the state of lid 10, and with second portion 232 joined to sidewall-forming member 223, second portion 232 forms part of sidewall 13.

[0101] (Side Wall Forming Member) The side wall forming member 223 is formed in an annular (including cylindrical) shape, and has a portion (upper forming portion) that forms the upper wall 205 and a portion (lower forming portion) that forms the lower wall 206. The upper forming portion has a portion (first contact wall portion 233) that contacts at least the outer surface side with the joint margin 230 that becomes the second portion 232 of the canopy forming member 222.

[0102] In the example shown in Figures 11A and 11B, the upper wall 205 (upper forming portion) has a first contact wall portion 233, a portion (second contact wall portion 234) that contacts the inner surface of the joint margin 230, which becomes the second portion 232 of the canopy-forming member 222, 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 joint margin 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 surface side of the first portion 231 of the canopy-forming member 222, and in the example shown in Figures 11A and 11B, it is slightly spaced from the first portion 231. However, this is just an example. The lower end of the second contact wall portion 234 may also contact the upper surface side of the first portion 231 of the canopy-forming member 222.

[0103] 11A and 11B, lower wall 206 (lower forming portion) is a portion that extends downward (diagonally downward in FIGS. 11A and 11B) from the lower end of first contact wall portion 233. It is preferable that lower wall 206 (lower forming portion) be located below the lower surface of first portion 231 of canopy portion-forming member 222 in terms of its position in the up-down direction, for example.

[0104] The lid 10B according to the third embodiment can be formed by processing a blank, which can be the blanks for forming the canopy-forming member 222 and the sidewall-forming member 223 (referred to as the first blank and the second blank, respectively, as described above in the second embodiment).

[0105] The first blank for forming the canopy-forming member 222 may be similar to the first blank 251 described above in the second embodiment, or may be a sheet material formed to a shape that matches the shape of the top surface 11 and further includes a joint margin 230. The canopy-forming member 222 is preferably formed by bending the first blank to form a first portion 231 that corresponds to the top surface 11 and a rising portion (a second portion 232 that serves as the joint margin). That is, the second portion 232 is preferably formed by bending the first blank upward at the peripheral edge of the first portion 231 (the base end of the joint margin 230).

[0106] The second blank for forming the sidewall-forming member 223 may be similar to the second blank 252 described in the second embodiment, or may be a fan-shaped sheet material. The edges of the second blank are joined to form an annular body. The upper end of the annular body is folded inward at a position corresponding to the continuous portion 235 to form the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235. This also forms an upper forming portion (a structural portion corresponding to the upper wall 205), and a lower forming portion (a structural portion corresponding to the lower wall 206). The formation of the upper forming portion and the lower forming portion forms the sidewall-forming member 223. At least the first contact wall portion 233 and the second contact wall portion 234 are bonded to the joining margin 230. In the example shown in FIG. 11B , the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235 are bonded to the joining margin 230, forming the bonding portion.

[0107] In manufacturing the lid 10B, it is preferable to join the canopy-forming member 222 to the annular body formed from the second blank. That is, the lower end of the joint margin 230 (second portion 232) of the canopy-forming member 222 is aligned with the boundary between the lower and upper forming portions (the boundary between the upper wall 205 and the lower wall 206) on the inner circumferential surface of the annular body, so that the joint margin 230 faces the inner circumferential surface of the annular body. Furthermore, as described above, the upper end portion of the annular body is folded inward at a position corresponding to the continuous portion 235 of the annular body, thereby covering the joint margin 230 from the upper end side. Then, the joint margin 230 is joined to the annular body that will become the sidewall-forming member 223 so as to be sandwiched between the first contact wall portion 233 and the second contact wall portion 234. This forms the sidewall-forming member 223 and obtains the lid 10B.

[0108] [3-2 Actions and Effects] According to the lid body 10B of the third embodiment, similar to the first embodiment, it is possible to obtain a lid body that can suppress leakage of the liquid that constitutes the mixed fluid from the through-hole 17 and has excellent recyclability.

[0109] [4 Fourth Embodiment] [4-1 Configuration] As shown in Figures 12A and 12B, the lid 10C according to the fourth embodiment is similar to that of the second embodiment in that it has a top surface 11 and a side wall 13 and can be fitted to a container. Furthermore, in the fourth embodiment, the top surface 11 is provided with a through-hole 17 and a gas-liquid separator 42, but these may be similar to those of the first and second embodiments, and therefore their description will be omitted. Figures 12A and 12B are a perspective view and a cross-sectional view showing an example of a lid according to the fourth embodiment.

[0110] The cover 10C according to the fourth embodiment has a configuration in which a portion of the side wall 13 extends above and below the top surface 11. The side wall 13 has an annular (including cylindrical) shape and includes an upper wall 205 and a lower wall 206. The lower wall 206 is a portion that extends below the top surface 11, and the upper wall 205 is made up of the portion of the side wall 13 excluding the lower wall 206. In the example shown in FIGS. 12A and 12B, the side wall 13 is tapered downward. Also, in the example shown in FIGS. 12A and 12B, a through-hole 17 is formed at a predetermined position on the top surface 11, but this is just one example.

[0111] (Members forming the canopy portion and the side wall portion) In the fourth embodiment, as shown in the second and third embodiments, the top surface portion 11 and the side wall portion 13 are formed from separate members. In the example of Figures 12A and 12B, the lid body 10C 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 that joins the canopy portion-forming member 222 and the side wall portion-forming member 223.

[0112] (Canopy-forming member) Canopy-forming member 222 has a first portion (first portion 231 of canopy-forming member 222) corresponding to top surface 11 and a second portion (second portion 232 of canopy-forming member 222) extending from the outer peripheral edge of first portion 231, with second portion 232 forming joint margin 230 shown in the second embodiment. In the example of Figure 12A, the second portion of canopy-forming member 222 is a portion (hanging portion) extending diagonally downward or directly downward from the outer peripheral edge of first portion 231, and with second portion 232 joined to sidewall-forming member 223, second portion 232 forms part of sidewall 13.

[0113] (Side Wall Forming Member) The side wall forming member 223 is formed in an annular (including cylindrical) shape, and has a portion (upper forming portion) that forms the upper wall 205 and a portion (lower forming portion) that forms the lower wall 206. The lower forming portion has a portion (lower first contact wall portion 237) that contacts at least the outer surface side with the joint margin 230 that becomes the second portion 232 of the canopy forming member 222.

[0114] 12A and 12B, the lower forming portion has a lower first contact wall portion 237, a portion (lower second contact wall portion 238) that contacts the inner surface of joint margin 230, which becomes second portion 232 of canopy portion-forming member 222, and further a lower end continuous portion 239 that connects lower first contact wall portion 237 and lower second contact wall portion 238, and lower end continuous portion 239 covers the lower end surface of joint margin 230, which becomes second portion 232 of canopy portion-forming member 222. The upper end of lower second contact wall portion 238 is located on the underside (opposing surface 73) of first portion 231 of canopy portion-forming member 222, and in the example of Figures 12A and 12B, it is preferably spaced apart from first portion 231. It is preferable that the edge 103 of the container 101 (for example, a part of the outer circumferential surface of the curled portion) can fit between the first portion and the upper end of the lower second contact wall portion 238.

[0115] In the example shown in Figures 12A and 12B, the upper wall 205 (upper forming portion) extends upward (diagonally upward in Figure 12B) from the upper end of the lower first contact wall portion 237. It is preferable that the upper wall 205 (upper forming portion) be located above the upper surface of the first portion 231 of the canopy-forming member 222 in terms of its vertical position. As shown in the example shown in Figures 12A and 12B, it is preferable that the upper forming portion has a curled portion (side wall upper end curled portion 236) formed on its upper end. In this case, it is possible to prevent the end surface of the blank (the second blank used to form the side wall-forming member 223) from being exposed at the upper end of the upper forming portion. This prevents discomfort caused by the user's mouth coming into contact with the end surface of the blank when consuming the contents of the container 101 by placing their mouth against the end surface of the blank. Furthermore, the formation of the side wall upper end curled portion 236 makes it difficult for liquid to come into contact with the portion of the side wall portion 13 that corresponds to the end face of the blank.

[0116] (Blank) The lid 10C according to the fourth embodiment can be formed by processing a blank. The blanks used to form the canopy-forming member 222 and the sidewall-forming member 223 (referred to as the first blank and the second blank, respectively, as described in the second embodiment) can be used. At least one blank selected from the group consisting of the first blank and the second blank may be formed in the same manner as the blank described above in the second embodiment.

[0117] The first blank used to form canopy-forming member 222 may be the same as first blank 251 described above in the second embodiment, or may be a sheet material formed to a shape that matches the shape of top surface 11 and further includes joint margin 230. Canopy-forming member 222 is preferably formed by bending and shaping the first blank to form a first portion 231 that corresponds to top surface 11 and a second portion 232 that becomes joint margin 230. In other words, second portion 232 is preferably formed by bending the first blank downward at the peripheral edge of first portion 231.

[0118] The second blank used to form the sidewall forming member 223 may be similar to the second blank 252 described above in the second embodiment, and may be a fan-shaped sheet material. The edges of the second blank are joined to form an annular body. The lower end of the annular body is then folded inward at a position corresponding to the lower-end continuous portion 239 to form 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 the upper forming portion (upper wall 205). The sidewall forming member 223 is formed by forming the lower forming portion and the upper forming portion.

[0119] In manufacturing the lid 10C, it is preferable to join the canopy-forming member 222 to the annular body formed from the second blank. The upper end of the joint margin 230 (second portion 232) of the canopy-forming member 222 is aligned with the boundary between the lower and upper forming portions (the boundary between the upper wall 205 and the lower wall 206) on the inner circumferential surface of the annular body, so that the joint margin 230 faces the inner circumferential surface of the annular body. Furthermore, as described above, the lower end portion of the annular body is folded inward at a position corresponding to the lower-end continuous portion 239 of the annular body, thereby covering the joint margin 230 from the lower end side. The joint margin 230 is then joined (adhered) to the lower forming portion (the annular body forming the sidewall-forming member 223) so as to be sandwiched between the lower first contact wall portion 237 and the lower second contact wall portion 238. This forms the sidewall-forming member 223 and obtains the lid 10C.

[0120] [4-2 Actions and Effects] According to the lid body 10C of the fourth embodiment, similar to the first embodiment, it is possible to obtain a lid body that can suppress leakage of the liquid that constitutes the mixed fluid from the through-hole 17 and has excellent recyclability.

[0121] The lid bodies 10, 10A, 10B, and 10C according to the first to fourth embodiments described above are configured to be fitted to the container 101 in the state of a lid-equipped container 150 described below, thereby forming a contact portion 151 between the lid body 10 and the container. The lid body 10 applicable to the present invention is not limited to this, and may be configured to form the contact portion 151 by joining the lid body 10 to the container 101, as described in the next fifth embodiment. In this case, the contact portion 151 is a portion where the container 101 and the lid body 10 are bonded (including adhesively adhered) to each other, and in order to separate the lid body 10 and the container 101, the lid body 10 and the container 101 are peeled off at the contact portion 151.

[0122] [5 Fifth Embodiment] [5-1 Configuration] As shown in Figures 13A to 13C, a lid 10D according to the fifth embodiment has a main body 40. The main body 40 forms the top surface 11 as described in the first embodiment, except that the curved portion 12 and the side wall portion 13 are omitted. The lid 10D according to the fifth embodiment is joined (adhered) to the container 101 in the state of a lidded container 150 by, for example, heat sealing.

[0123] The lid body 10 has a joint area corresponding portion 95A. As shown in Fig. 13A, the lid body 10 also has a lid area corresponding portion 95B and an outer area corresponding portion 95C. The lid area corresponding portion 95B is configured as a portion that covers the opening 102. The outer area corresponding portion 95C is configured as a portion that is further outward than the lid area corresponding portion 95B.

[0124] (Joining Area Corresponding Portion) The joining area corresponding portion 95A is a portion of the lid body 10D corresponding to a region that is joined to the container 101 along the edge 103 of the container 101. That is, the joining area corresponding portion 95A is a portion of the lid body 10D that corresponds to the contact region R (the region facing the edge 103 of the container 101 and that is joined to the container 101 in the fifth embodiment). In the lid-equipped container 150, the joining area corresponding portion 95A is a portion of the lid body 10D that forms the contact portion 151 between the lid body 10D and the container 101. Specifically, in a plan view of the lid body 10D (when the line of sight is in the Z-axis direction (up and down direction) in the examples of FIGS. 13A to 13C ), the portion that forms the contact region R is defined as the joining area corresponding portion 95A. The joining area corresponding portion 95A is usually formed in a ring shape as shown in FIG. 15A . In particular, as shown in FIG. 13A , when the edge 103 of the container 101 is formed in a generally annular shape, the contact region R is annular, and the bonding region corresponding portion 95A is also generally annular in a plan view of the lid 10. The outer edge of the bonding region corresponding portion 95A is determined according to the position of the outer edge of the contact region R. The outer edge of the bonding region corresponding portion 95A may be located on the outer peripheral edge of the lid 10 (in which case, the bonding region corresponding portion 95A and the outer region corresponding portion 95C coincide), or may be located inside the outer peripheral edge of the lid 10 as shown in the example of FIG. 13A . When the contact region R between the lid 10 and the container 101 is not formed continuously, the portion sandwiched between adjacent contact regions R and facing the edge 103 is also included in the bonding region corresponding portion 95A, which will be described later.

[0125] (Lid region corresponding portion) The lid region corresponding portion 95B is a portion configured to cover the opening 102. In the example of Fig. 13A, the lid region corresponding portion 95B is a portion of the lid 10 that is inward from the joining region corresponding portion 95A. The lid region corresponding portion 95B is a portion that covers the opening 102 in the lid-equipped container 150. Note that the portion that covers the opening 102 is a portion that covers at least a portion of the opening 102, and includes a case where the portion has a portion that can be partially opened, such as the insertion port 16, as will be described later.

[0126] (Outer Area Corresponding Portion) As shown in the example of Figure 13A, the outer portion of the lid area corresponding portion 95B of the lid body 10 is the outer area corresponding portion 95C, which is the same portion as the bonding area corresponding portion 95A or a portion that includes the contact area R.

[0127] In the main body 40 of the lid body 10, the lid region corresponding portion 95B has a through portion 17 extending inward from the peripheral edge 74, which is the outer periphery of the lid region corresponding portion 95B. However, this does not prohibit a portion of the through portion 17 from being formed outside the lid region corresponding portion 95B. The configuration of the through portion is the same as in the first embodiment, and therefore a detailed description thereof will be omitted.

[0128] In the main body 40 (top surface 11) of the lid body 10 shown in the example of Figures 13A to 13C, the gas-liquid separating material 42 is arranged so as to face the lid region corresponding portion 95B. When the direction of the line of sight of the lid body 10 is from the opposing surface 73 side toward the exposed surface 72, the gas-liquid separating material 42 is arranged so as to cover the through-hole portion 17, as in the first to fourth embodiments. The gas-liquid separating material 42 and the top surface 11 are fixed together with a coating agent 48. The gas-liquid separating material 42, top surface 11, coating agent 48, and through-hole portion 17 are the same as those described in the first embodiment, and therefore detailed description thereof will be omitted.

[0129] [5-2 Actions and Effects] According to the lid body 10D of the fifth embodiment, similar to the first embodiment, it is possible to obtain a lid body that can suppress leakage of the liquid that constitutes the mixed fluid from the through-hole 17 and has excellent recyclability.

[0130] [6. Application Examples] (Application Example 1) When the lids of the first to fourth embodiments are used, the lids can be used in a lidded container 150 as shown in FIGS. 15A and 15B. FIG. 15A is a diagram showing an example in which the lid 10 according to the first embodiment is attached to an edge 103 that forms the outer periphery of an opening 102 of a container 101 having an opening 102 formed at its upper end. In this example, the lid 10 is engaged with the edge 103. FIG. 15B is a cross-sectional view schematically showing the state of the vertical cross section taken along line CC in FIG. 15A. The explanation of the lidded container 150 will continue with reference to FIGS. 15A and 15B.

[0131] (Container with lid) The container with lid 150 has a contact portion 151 where the container 101 and the lid 10 come into contact, and the region of the lid 10 that forms the contact portion 151 is the contact region R. The lid 10 can be attached by fitting it to the container 101. In the explanation of (Application Example 1), a case where the lid 10 according to the first embodiment is used in the container with lid 150 will be explained as an example.

[0132] The container 101 has a container body 110 having a cylindrical sidewall 104 and a bottom 107 that increase in diameter upward (or taper downward), forming a space 105 inside, and an opening 102 that opens at the upper end of the container body 110 (the upper end of the sidewall 104). Although not shown, the opening 102 of the container 101 is formed in a circular shape. However, the container 101 shown here is an example and is not intended to limit the configuration of the container 101. For example, the opening 102 of the container 101 may be formed in a rectangular shape. The container 101 may be any container as long as the opening 102 can be covered with the lid 10. In such a case, however, it is preferable that the shape of the lid 10 be a shape that matches the shape of the container 101 (e.g., a rectangular shape).

[0133] 15A, 15B, etc., the edge 103 of the opening 102 has a flange portion. The flange portion may be a curled portion 108 formed by outwardly winding a member forming the container body 110, or may be formed as a portion (a flange portion) that extends outward on a plane.

[0134] The material stored inside container 101 (space 105) is not particularly limited, and examples include liquid materials, materials containing both solid and liquid materials, materials in which gas is mixed or dissolved in a liquid (such as carbonated water), and combinations thereof, but the lid of the present invention is particularly effective when the contents contain (or include in the contents) a mixed fluid containing gas and liquid. In other words, when a fluid such as a liquid is contained, the mixed fluid may be blown outward from the opening of the container, causing the problem of the liquid constituting the mixed fluid leaking from inside the container.

[0135] The lidded container 150 is provided with a special structure for separating gas and liquid, which prevents the problem of the liquid constituting the mixed fluid leaking from the container 101. Furthermore, the special structure for separating gas and liquid is made of a paper material called the gas-liquid separator 42, and the top surface 11 is also made of a paper material, which improves the recyclability of the lid.

[0136] (Application Example 2) When the lid 10D of the fifth embodiment is used as the lid 10, the lid-equipped container 150 can be attached to the container 101 by joining the lid 10 to the container 101 at a region of the lid 10 (contact region R) that forms the contact portion 151. Examples of joining methods that can be used include ultrasonic welding and heat sealing. A resin layer is generally formed on the edge 103 of the container 101. In such cases, the lid 10D and the container 101 can be joined using ultrasonic welding, heat sealing, or other methods without the need for an adhesive between the lid 10 and the container 101. However, this does not prohibit the contact portion 151, where the lid 10D and the container 101 come into contact, from being formed by bonding the lid 10D and the container 101 with an adhesive (e.g., starch glue) between them.

[0137] Application Example 3 The lid 10 according to the present invention may be combined with a container 101 having an opening 102 .

[0138] [7. Example of a Filter] Filters that separate liquid from other components in a container's contents include paper filters, such as filter paper. However, such filters separate liquid from solids and are generally not intended for use with "gas-liquid mixed fluids" that are intended to be expelled to the outside. The gas-liquid separator 42 used in the lid 10 of the present invention can be used as a filter for gas-liquid mixed fluids. Such a filter can generally separate gas from gas-liquid mixed fluids.

[0139] As explained above, the present invention can be applied to many such aspects. It can also be applied to stores and methods of providing packaging components other than those described above. The lid body according to the present invention has been described in detail above, but the above examples are merely examples of the lid body according to the present invention and are not limited to these. Therefore, modifications may be made as appropriate within the scope of the spirit of the present invention. Furthermore, the configurations of the inventions described above may be used independently of each other, or may be applied in appropriate combination.

[0140] Next, a further description will be given of the lid configuration A. Configuration A refers to a lid configuration having a structure in which the gas-liquid separator 42 is omitted from the lid 10D of the fifth embodiment.

[0141] In the example of the lid 10D according to the fifth embodiment described above (the example shown in FIGS. 13A to 13C ), the gas-liquid separation material 42 is avoided in the joint area corresponding portion 95A of the top surface 11. As shown in the first embodiment, the top surface 11 preferably has a paper-based substrate 41 made of a paper-based material, and it is preferable to avoid forming a coating layer on the paper-based substrate 41. When the top surface 11 is made of a paper-based material and the formation of a coating layer is avoided, at least the joint area corresponding portion 95A of the top surface 11 has fibers that make up the paper-based material exposed on the surface. As described in Application Example 2 above, when the lid 10D and the container 101 are bonded using various bonding methods, such as heat sealing and ultrasonic welding, utilizing a resin layer typically formed on the edge 103 of the container 101, if the fibers constituting the paper-based material are exposed on the surface of at least the bonding area corresponding portion 95A of the top surface 11, the lid 10D and the container 101 can be bonded while suppressing the effect of reduced adhesion between the lid 10D and the container 101 due to the type of resin constituting the resin layer of the container 101. Furthermore, if the fibers constituting the paper-based material are exposed on the surface of the bonding area corresponding portion 95A, the bond between the lid 10D and the container 101 can be strengthened. This effect can also be achieved when the gas-liquid separator 42 is omitted from the lid 10D. Furthermore, a lid 10D without the gas-liquid separator 42 can further improve recyclability, i.e., such a lid can achieve the same effect as the first embodiment in terms of recyclability. It is also possible to somewhat prevent the liquid contents from leaking from the container with a lid by making the paper-based material that makes up the lid absorb and / or adhere the liquid.

[0142] Therefore, as described above, the form of the lid having a structure in which the gas-liquid separator 42 is omitted from the lid 10D of the fifth embodiment will be referred to as Form A, and the following description will continue with Forms A1 and A2 as examples of Form A. In this specification, when there is no need to distinguish between Forms A1 and A2, they will be referred to collectively as Form A. The following description of Form A will be given in the order of Form A1, Form A2, and an application example of Form A.

[0143] 8. Lid Configuration (Configuration A1) 8-1 Configuration As shown in FIGS. 20A and 20B , the lid 300A according to Configuration A1 has a structure similar to that of the lid 10D of the fifth embodiment, except for the omission of the gas-liquid separator 42 from the lid 10D. The lid 300A according to Configuration A1 may have the same configuration as that of the fifth embodiment, except for the omission of the gas-liquid separator 42 from the lid 10D. The lid 300A according to Configuration A1 has a main body 290. The main body 290 may have the same structure as the main body 40 of the fifth embodiment, except for the omission of the gas-liquid separator 42. In Configuration A1, the main body 290 has a top surface 291, which has a paper-based substrate 41 similar to the top surface 11 described in the fifth embodiment. The lid 300A according to Configuration A1 is joined (adhered) to the container 101 in the state of a lid-equipped container 150, for example, by heat sealing. That is, the lid 300A according to form A1 comprises a main body 290 having a paper-based substrate 41 having a plurality of paper fibers as fibers, and is formed so as to be joinable (contactable via the resin coating layer) to a container 101 having an opening 102 formed at the top end and an edge 103 forming the outer periphery of the opening 102, and having a resin layer (resin coating layer) on its surface. The main body 290 has a joining area corresponding portion 295A corresponding to a joining area defined as an area to be joined to the container along the edge 103 of the container 101, has a portion that exposes the surface of the paper-based substrate 41, and is configured so that the resin coating layer (the resin coating layer of the container 101) can be adhered to at least a portion of the joining area corresponding portion 5A (the portion that exposes the surface of the paper-based substrate 41).

[0144] In the example shown in Figure 1, the main body 290 does not include a through-hole configuration, but the lid 300A according to Form A1 is not limited to this. Also, in Figures 20A and 20B, reference numerals 298 and 299 are shown, where reference numeral 298 indicates the exposed surface and reference numeral 299 indicates the opposing surface. The exposed surface 298 is defined similarly to the exposed surface 72 shown in the first to fifth embodiments, and the opposing surface 299 is defined similarly to the opposing surface 73 shown in the first to fifth embodiments. Also, reference numeral RN is shown in Figures 20A and 20B, where reference numeral RN indicates the bonding region. The bonding region RN can be defined as the same area as the contact region R shown in the fifth embodiment. Reference numeral CT shown in Figures 20A and 20B indicates the center (central position) of the lid 300A.

[0145] As described above, the main body 290 of the lid body 300A according to form A1 preferably has the paper-based substrate 41 described in the first embodiment, i.e., a paper-based substrate 41 made of a paper-based material. In the lid body 300A according to form A1, it is preferable that the paper-based substrate 41 used to form the main body 290 is free from the formation of a coating layer. It is preferable that the main body 290 is made of a paper-based substrate 41, and that the formation of a coating layer is avoided. As described above, when the main body 290 is made of a paper-based substrate 41, and the formation of a coating layer is avoided, at least the bonding area corresponding portion 295A of the top surface portion 291 of the main body 290 has the fibers of the paper-based material exposed to the surface. Note that in the example of FIGS. 20A and 20B , the fibers of the paper-based material are exposed to the surface not only in the bonding area corresponding portion 295A but also in the lid area corresponding portion 295B.

[0146] In the example of Figures 20A and 20B, in addition to the joint area corresponding portion 295A, a lid area corresponding portion 295B is present on the main body 290, and the lid area corresponding portion 295B is defined in the same manner as the joint area corresponding portion 95A and the lid area corresponding portion 95B described in the fifth embodiment. Therefore, in the description of form A1, description of the joint area corresponding portion 295A and the lid area corresponding portion 295B will be omitted. Also shown in Figures 20A and 20B is an outer area corresponding portion 295C. The outer area corresponding portion 295C is defined in the same manner as the outer area corresponding portion 95C described in the fifth embodiment. Therefore, in the description of form A1, description of the outer area corresponding portion 295C will be omitted.

[0147] (Unevenness) In the portion of the top surface 291 of the main body 290 where the fibers constituting the paper-based material are exposed to the surface, numerous fine unevenness 292 are formed on the surface of the top surface 291, as shown in FIGS. 21A and 21B . In the paper-based base material 41 used to form the main body 290, the fibers constituting the paper-based base material 41 overlap with each other in various directions and shapes (curved shapes, bent shapes, etc.). Therefore, the overlapping state of the fibers varies depending on the position on the surface of the main body 290. The fine unevenness 292 is formed as a result of the formation of relatively protruding portions 292A and relatively depressed portions 292B due to differences in the position on the surface of the main body 290. In other words, the unevenness 292 is formed by a combination of portions 292A and 292B. 21A, the areas corresponding to portions 292A and 292B are shown with different hatching, and the portion that is roughly defined as the boundary between portions 292A and 292B (the intermediate portion between the protruding end of portion 292A and the recessed end of portion 292B (the intermediate portion based on the thickness direction of main body 290)) is shown with a solid line. 21A and 21B show enlarged views of region XR1 surrounded by dashed lines in FIG. 20A and region XR2 surrounded by dashed lines in FIG. 20B, respectively, but the magnification ratios are not uniform.

[0148] [8-2 Actions and Effects] When a lid is applied to a lid-equipped container, a resin layer is generally formed on the inner surface of the container body. The container body can be formed by forming a first blank piece for forming the side wall into a cylindrical shape and then placing a second blank piece for forming the bottom at a predetermined position on the inner circumferential surface of the cylindrical body. A resin layer (resin coating layer) may be used to secure the side ends of the first blank piece to fix the shape of the tubular body formed by overlapping the two side ends. In this case, because the resin coating layer is used to secure two different locations on a single member, the first blank piece, the need to consider the adhesive properties of the different members was not recognized. When the container and lid are formed separately, bonding the container and lid is considered to be bonding different members, so adhesive properties must be considered. In conventional lids, a resin layer has been provided on the lid to bond the container and lid. In this case, there is a problem that although the adhesive strength between a specific container and the lid is high, the adhesive strength between another container and the lid is low.

[0149] In contrast, with the lid 300A according to form A1, by utilizing a resin layer typically formed on the edge 103 of the container 101 and using various bonding methods, such as heat sealing or ultrasonic welding, the lid 300A can be more reliably bonded to the container 101 at the bonded region corresponding portion 295A, as shown in Figures 22A and 22B . If the surface of the bonded region corresponding portion 295A facing the container 101 is coated with a resin layer, it is necessary to consider the effect of the type of resin constituting the resin layer of the container 101 on reducing the adhesive strength between the lid 300A and the container 101. However, by exposing the fibers constituting the paper-based material on the surface of the bonded region corresponding portion 295A, it is possible to mitigate the effect of reducing the adhesive strength between the lid 300A and the container 101. Note that Figure 22B also shows an enlarged view of the area XRA enclosed by the dashed line.

[0150] 20A and 20B, in the example of lid body 300A according to form A1, at least in bonding area corresponding portion 295A, as shown in Figures 21A and 21B, the fibers constituting paper-based substrate 41 are exposed on the surface, and unevenness 292 is formed in the portion where the fibers are exposed on the surface. In the example shown in Figures 20A and 20B, in lid area corresponding portion 295B as well, the fibers constituting paper-based substrate 41 are exposed on the surface, and unevenness 292 is formed in the portion where the fibers are exposed on the surface. According to the lid body 300A of form A1, as shown in Figures 22A and 22B, when a resin layer (resin coating layer 120) that is generally formed on the edge portion 103 of the container 101 comes into contact with the bonding area corresponding portion 295A, the resin layer (resin coating layer 120) comes into contact with the unevenness 292, and therefore the contact area between the resin layer and the bonding area corresponding portion 295A is wider than when the unevenness 292 is not present on the surface of the main body 290, and a state in which the resin layer and the bonding area corresponding portion 295A are more strongly adhered to each other is formed.

[0151] Next, the configuration A2 will be described. Specifically, the first to fifth configuration examples of the configuration A2 will be described.

[0152] [9. Lid Configuration (Configuration A2)] [9-1. First Configuration Example for Configuration A2] [(1) Structure] The lid 300B according to Configuration A2 has a lid main body (main body 303). The main body 303 is formed so as to be bondable to a container main body 410 of a container 401 via an adhesive material 302. As shown in FIGS. 25A and 25B, the container main body 410 has an opening 402 formed at its upper end and an edge 403 forming the outer periphery of the opening 402. FIGS. 25A and 25B are perspective and cross-sectional views showing an example of a lid-equipped container 450 in which the lid 300B shown in FIGS. 23A and 23B is bonded to the container 401. The lid 300B can be used by being bonded along the edge 403. In the lid 300B, the region bonded to the edge 103 in a plan view of the lid 300B is referred to as a bonding region RA. Figure 23A is a plan view showing one embodiment of the lid 300B. Figure 23B is a cross-sectional view showing the state of the vertical cross section taken along line A-A in Figure 23A. Note that it is more preferable to use a container 401 that has flexibility at the edge 403 of the opening 402. However, this does not prohibit the container 401 from being a container that has little or no flexibility, such as a metal container.

[0153] 23A and 23B, the bonding area RA corresponds to a region formed in a generally annular shape along the opening 402 of the container 401 in a shape corresponding to the opening 402. The bonding area RA can be defined as a region similar to the contact area R in the fifth embodiment, form A1, and the like.

[0154] In explaining form A2, as in the first embodiment and form A1 described above, assuming that the main body 303 and the container body 410 are joined via adhesive material 302, the surface of the main body 303 that faces the container 401 is referred to as the facing surface 373 (the surface facing the container 401 when the container 450 is in the state of a lidded body), and the surface opposite to the facing surface 373 is referred to as the exposed surface 372 (the surface exposed to the outside when the container 450 is in the state of a lidded body).

[0155] In addition to the main body 303, for other components such as the lid body 300B and the lid area corresponding portion 305B, the surfaces facing in the same direction as the exposed surface 372 may be referred to as exposed surfaces, and the surfaces facing in the same direction as the opposing surface 373 may be referred to as opposing surfaces.

[0156] (Main Body) The main body 303 has a paper-based substrate 304 having a plurality of paper fibers 306A as the fibers 306. Having the paper-based substrate 304 means including the paper-based substrate 304 or being formed from the paper-based substrate 304. From the viewpoint of ensuring that the paper fibers 306A are exposed on the surface of the main body 303, it is preferable that the main body 303 be formed from the paper-based substrate 304. The main body 303 can be obtained, for example, by manufacturing a blank material in which a sheet made of the paper-based substrate 304 is formed (processed) into a predetermined shape.

[0157] (Fibers) The fibers 306 refer to structures that can be recognized as having an elongated shape when observed in a plan view of the paper-based substrate 304 using an electron microscope or an optical microscope at a magnification of about 50 times.

[0158] (Paper-Based Substrate) The paper-based substrate 304 may be configured similarly to the paper-based substrate 41 of the first embodiment, form A1, or the like. However, it is preferable that the paper-based substrate 304 be a sheet having a plurality of paper fibers 306A as the fibers 306. The paper fibers 306A refer to fibers formed from pulp. "Pulp" includes pulp fibers and fibers made from pulp (e.g., recycled fibers). The paper-based substrate 304 may be composed solely of paper fibers or may contain fibers such as non-pulp natural fibers, synthetic fibers, and recycled fibers. However, it preferably contains 50% or more by mass of paper fibers, more preferably 70% or more by mass, and even more preferably 80% or more by mass, and particularly preferably 100% by mass of paper fibers. The paper-based substrate may be a composite material containing not only paper fibers but also nonwoven fabrics, wood-based materials such as wood foil, and even aluminum foil. However, when forming a composite material, it is preferable that the composite material as a whole contains 50% or more by mass of paper fibers, and particularly preferably contains 80% or more by mass of paper fibers. The higher the paper fiber content ratio, the more easily the paper-based substrate 304 is biodegraded, which is preferable.

[0159] It is preferable that the main body 303 and the paper-based substrate 304 do not contain various resins, but the inclusion of various resins is not completely prohibited. However, if the main body 303 or the paper-based substrate 304 contains various resins, from the viewpoint of reducing the environmental burden, the mass ratio of the resin to the total mass of the lid body 300B is preferably less than 1 mass%, and more preferably 0.8 mass% or less. Furthermore, even if the main body 303 or the paper-based substrate 304 contains various resins, it is preferable to select biodegradable resins, which pose fewer environmental pollution problems than other resins. As mentioned in the description of the lid 10 according to the first embodiment, examples of biodegradable resins include microbially produced biodegradable resins such as polyhydroxyalkanoate (PHA) and PHA-based copolymers; natural product-based biodegradable resins such as cellulose derivatives such as cellulose acetate and starch-based resins whose main raw material is 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); chemically synthesized biodegradable resins such as polycaprolactone and polyvinyl alcohol (PVA); and other biodegradable resins such as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product name: Biorecover, product name: Cra Drop, etc.).

[0160] In the lid body 300B, the main body 303 has a joining area corresponding portion 305A corresponding to the joining area RA defined as the area to be joined to the container 101 along the edge 103 of the container 101, and a lid area corresponding portion 305B configured from the portion inward from the joining area corresponding portion 305A (toward the central position (center CT) in FIG. 23 ). As shown in FIG. 23 , the main body 303 may have an outer area corresponding portion 305C defined as the portion outside the lid area corresponding portion 305B. As described below, the joining area corresponding portion 305A, the lid area corresponding portion 305B, and the outer area corresponding portion 305C can be defined as the same portions as the joining area corresponding portion 95A, the lid area corresponding portion 95B, and the outer area corresponding portion 95C, respectively, of the fifth embodiment, form A1, etc.

[0161] (Joining Area Corresponding Portion) As described above, the joining area corresponding portion 305A is a portion of the lid 300B corresponding to the area joined to the container 401 along the edge 403 of the container 401. That is, the joining area corresponding portion 305A is a portion of the lid 300B corresponding to the joining area RA (an area facing the edge 403 of the container 401 and joined to the container 401). In the lid-equipped container 150, the joining area corresponding portion 305A is a portion of the lid 300B that forms the joining portion 451 between the lid 300B and the container 401. Specifically, in a plan view of the lid 300B (when the line of sight is in the Z-axis direction (up and down direction) in the example of FIG. 23 ), the portion that forms the joining area RA is defined as the joining area corresponding portion 305A. The joining area corresponding portion 305A is usually formed in a ring shape as shown in FIG. 23 . In particular, as shown in FIG. 23 , when the edge 403 of the container 401 is formed in a generally annular shape, the bonding area RA is also annular, and the corresponding bonding area 305A is also generally annular in a plan view of the lid 300B. The outer edge of the corresponding bonding area 305A is determined according to the position of the outer edge of the bonding area RA. The outer edge of the corresponding bonding area 305A may be located on the outer periphery of the lid 300B (in which case the corresponding bonding area 305A and the corresponding outer area 305C coincide), or may be located inside the outer periphery of the lid 300B, as shown in the example of FIG. 23 . When the bonding area RA between the lid 300B and the container 401 is not formed continuously, the portion sandwiched between adjacent bonding areas RA and facing the edge 403 is also considered to be included in the corresponding bonding area 305A, which will be described later.

[0162] (Lid region corresponding portion) Lid region corresponding portion 305B is a portion configured to cover opening 402. In the example of FIG. 23A , lid region corresponding portion 305B is a portion of lid 300B that is inward from joining region corresponding portion 305A. Lid region corresponding portion 305B is a portion that covers opening 402 in lid-equipped container 450. Note that the portion that covers opening 402 refers to a portion that covers at least a portion of opening 402, and includes a case where the portion has a partially openable portion such as insertion port 319, as will be described later.

[0163] (Outer Area Corresponding Portion) As shown in the example of FIG. 23A, the outer portion of the lid area corresponding portion 305B of the lid body 300B is the outer area corresponding portion 305C, which is the same portion as the bonding area corresponding portion 305A or a portion including the bonding area RA.

[0164] (Receiving Structure) Because the paper-based substrate 304 has a structure in which fibers 306 are layered, the surface may have a fine uneven structure 307 as shown in Fig. 24A. The paper-based substrate 304 has a receiving structure 308 in at least a part of the uneven structure 307 that allows the adhesive substance 302 to penetrate toward the exposed surface 372 side beyond the fibers 306 (fibers exposed on the opposing surface 373 side) arranged on the surface of the paper-based substrate 304 when the main body 303 is bonded to the container main body 410 via the adhesive substance 302.

[0165] An example of the receiving structure 308 is the overlapping structure 309. The receiving structure 308 such as the overlapping structure 309 can be formed by controlling the density, basis weight, and entanglement strength of the fibers 306 that make up the paper-based substrate 304 during the manufacture of the paper-based substrate 304. The receiving structure 308 such as the overlapping structure 309 may also be formed by subjecting the surface of the paper-based substrate 304 (particularly the surface on the opposing surface 373 side) to a treatment that slightly roughens it (roughening treatment).

[0166] (Overlap Structure) The paper-based substrate 304 may have an overlap structure 309 (an overlap structure having non-adhered portions of fibers) defined as a structure in which the fibers 306 overlap (a structure in which at least a portion of the fibers 306 overlap in a plan view of the lid 300B) so that, when the main body 303 is bonded to the container main body 410 via the adhesive substance 302, the adhesive substance 302 can penetrate toward the exposed surface 372 beyond the fibers 306 arranged on the surface of the paper-based substrate 304. The overlap structure 309 is formed, for example, at an intersection of the fibers 306, 306 that intersect with a gap as shown in Fig. 24C , or at a portion where the fibers 306, 306 that are partially in contact with each other gradually move apart as shown in the example of Fig. 24B .

[0167] In the cover 300B, as shown in FIG. 24B, at least a part of the overlap structure 309 of the paper-based base material 304 is exposed on at least a part of the surface of the joint area corresponding portion 305A on the opposing surface 373 side.

[0168] (Distribution of Receiving Structures) On the facing surface 373, the receiving structures 308 are not limited to being concentrated in a portion of the bonded region corresponding portion 305A as shown in Figure 29C, but may be present over substantially the entire area of ​​the bonded region corresponding portion 305A as shown in Figure 29A (or may be present dispersedly over the entire surface of the bonded region corresponding portion 305A). The receiving structures 308 may also be present in at least a portion of the lid region corresponding portion 305B. The receiving structures 308 of the paper-based substrate 304 may also be present over substantially the entire area of ​​the lid region corresponding portion 305B as shown in Figure 29B (or may be present dispersedly over the entire surface of the lid region corresponding portion 305B). In Figures 29A to 29C, the positions corresponding to the points indicated by symbols P1, P2, P3, P4, ... indicate the positions of the receiving structures 308.

[0169] (Rising Structure) The paper-based substrate 304 may have a rising structure 310 formed as a structure in which the fibers 306 rise. The rising structure 310 is preferably formed so that, when the main body 303 is bonded to the container main body 410 via the adhesive substance 302, the adhesive substance 302 can penetrate toward the exposed surface 372 side beyond the fibers 306 arranged on the surface of the paper-based substrate 304.

[0170] In the cover 300B, it is preferable that at least a part of the raised structure 310 of the paper-based substrate 304 is exposed on at least a part of the surface of the bonding region corresponding portion 305A on the opposing surface 373 side.

[0171] The distribution of the raised structures 310 is not limited to being concentrated in a part of the joint area corresponding portion 305A, as with the distribution of the receiving structures 308, but may be present over substantially the entire surface of the joint area corresponding portion 305A (or may be present dispersedly over the entire surface of the joint area corresponding portion 305A). Furthermore, the raised structures may also be present in at least a portion of the lid area corresponding portion 305B. Furthermore, the raised structures 310 of the paper-based substrate may be present not only in the joint area corresponding portion 305A but also over substantially the entire surface of the lid area corresponding portion 305B (or may be present dispersedly over the entire surface of the lid area corresponding portion 305B).

[0172] A portion of the rising structure 310 may also serve as the above-described overlapping structure 309. Furthermore, the rising structure 310 may be connected to the above-described overlapping structure 309 depending on the positional relationship and shape of the first fiber portion 311 and the second fiber portion 312, which will be described later. In the example of FIG. 27A , a predetermined portion BC on one end of the second fiber portion 312 forms the overlapping structure 309, and the predetermined portion BC and a predetermined portion FR on the other end form the rising structure 310. In a state in which the main body 303 is bonded to the container main body 410 via the adhesive material 302, the rising structure 310 may be maintained as shown in FIG. 27B , or may be collapsed as shown in a second embodiment, which will be described later with reference to FIG. 27C .

[0173] The raised structure 310 may also function as the overlapping structure 309. For example, in the example of FIG. 24B , there is a first fiber portion 311 (fibers located more inward than a second fiber portion 312, which will be described later) composed of fibers 306 located on the exposed surface 372 side, and a second fiber portion 312 (fibers arranged on the surface of the paper-based substrate 304) composed of fibers located closer to the opposing surface 373 along the thickness direction of the paper-based substrate 304 than the first fiber portion 311. The fibers (second fiber portion 312) arranged on the surface of the paper-based substrate 304 rise in a diagonal direction (slightly toward the −Z direction) relative to the fibers (first fiber portion 311) located more inward than the second fiber portion 312 (a raised structure 310 is formed) (hanging diagonally downward in FIG. 24B ), and the first fiber portion 311 and the second fiber portion 312 are at least partially overlapping in a plan view of the main body 303 (an overlapping structure 309 is formed). Therefore, the structure formed by the first fiber portion 311 and the second fiber portion 312 forms both the rising structure 310 and the overlapping structure 309 .

[0174] In the example of Figure 24B, a gap 314 is formed between the first fiber part 311 and the second fiber part 312, and the gap 314 is large enough to allow the adhesive substance 302 to penetrate toward the exposed surface 372 side (the first fiber part 311 side in Figure 24B) beyond the fibers 306 (the second fiber part 312 in Figure 24B) arranged on the surface of the paper-based substrate 304 when the main body 303 is bonded to the container body 410 via the adhesive substance 302.

[0175] In the example of Figure 24B, one first fiber part 311 and one second fiber part 312 are formed, but when the area where the gap 314 is formed is defined as an overlap area (shown by the symbol OVL in Figures 28A and 28B) in a plan view of the lid body 300B (a plan view of the main body 303), there may be multiple second fiber parts 312 located in the overlap area OVL, as shown in Figure 28B (in Figure 28B, 2-1 fiber part 312A, 2-2 fiber part 312B, and 2-3 fiber part 312C are formed as the second fiber parts 312). Also, as shown in Figure 28A, there may be multiple fiber parts as the first fiber part 311 located in the overlap area OVL, which form gaps 314 together with the second fiber part 312 (in Figure 28A, the first fiber parts 311 are formed as 1-1 fiber part 311A, 1-2 fiber part 311B, and 1-3 fiber part 311C).

[0176] (Adhesive Substance) The adhesive substance 302 is a substance capable of adhering the main body 303 and the container main body 410. Examples of the adhesive substance 302 include resins such as thermoplastic resins and adhesives. The adhesive substance 302 is preferably a resin layer 420 (resin coating layer) pre-formed on the container main body. However, this does not prohibit the adhesive substance 302 from being a substance interposed between the main body 303 and the container main body 410, separate from the main body 303 and the container main body 410. Generally, a thermoplastic resin such as polyethylene is often used as the resin layer 420. When the adhesive substance 302 is a resin layer 420 (resin coating layer) pre-formed on the container main body, the resin layer 420 can adhere the lid 300B and the container 401 when the lid 300B and the container 401 are adhered by a heat sealing method. In other words, the resin layer 420 can function as the adhesive substance 302.

[0177] (Surface Roughness) The paper-based substrate 304 preferably has a surface roughness (maximum height Rz) (μm) of a predetermined value or more in at least a portion of the bonding region corresponding portion 305A. When the surface roughness varies across the surfaces of the paper-based substrate 304, the surface with the greater surface roughness preferably forms the opposing surface 373. When a paper-based substrate 304 with a greater surface roughness is used to form the main body 303, the contact area between the adhesive substance 302 and the fibers 306 arranged on the surface of the paper-based substrate 304 can be increased when the main body 303 is bonded to the container body 410 via the adhesive substance 302, thereby increasing the bonding strength between the lid 300B and the container 401.

[0178] [(2) Actions and Effects] Conventionally, packaging components, such as containers such as cups and lids, have been generally made of plastic due to their cost and moldability, as shown in Patent Document JP 2021-84646 A. The environmental impact of plastics has become a problem. In particular, conventional synthetic plastics, such as petroleum-based synthetic resins, have been recognized as having the problem of not naturally decomposing after disposal and remaining in nature for long periods of time. To address this issue, the use of biodegradable plastics has been considered even when using plastics as packaging materials. However, while biodegradable plastics are more naturally degradable than conventional synthetic plastics, there is a strong demand for cost improvements. In light of these issues, the use of paper-based materials as packaging materials has been considered as materials (non-plastic materials) that have a lower environmental impact than plastics. Examples of methods for obtaining packaging components using paper-based materials include obtaining blanks based on paper-based substrates and processing the blanks to obtain packaging components.

[0179] When the packaging component is a lid body and the lid body is obtained by processing a blank material formed from a sheet (paper sheet) as a paper-based substrate, it is also possible to form the lid body from a sheet having resin layers formed on both sides to improve water resistance. However, since a resin coating layer is usually formed on the surface of the container as a resin layer to waterproof the container, depending on the resin material constituting the resin layer, adhesion with the resin constituting the resin coating layer may be impaired, making it difficult to bond the container and the lid body by a sealing method. Therefore, there is room for improvement in terms of making it possible to bond the container and the lid body by a heat sealing method even if the types of resins constituting the resin coating layer formed on the surface of the container are diverse. In other words, there has been a demand for improvement in terms of making it possible to bond the container and the lid body by a sealing method even if the types of resins constituting the resin layer (resin coating layer) formed on the surface of the container are diverse.

[0180] These conventional techniques and requests for improvement are addressed for all lids according to Form A. Furthermore, with a lid according to Form A (for example, the lids according to Form A1 and Form A2 described above), it is possible to bond the container and the lid by a sealing method even if the types of resins that make up the resin layer (resin coating layer) formed on the surface of the container are diverse.

[0181] Furthermore, according to the lid 300B of the embodiment A2, the main body 303 of the lid 300B is made of a paper-based substrate 304 and further includes the overlap structure 9. Therefore, when the lid 300B is attached to the container 401 using a heat-sealing method, the resin constituting the resin layer 420 formed on the surface of the edge 403 of the container 401 penetrates toward the exposed surface 372 rather than the fibers 306 arranged on the surface of the paper-based substrate 304, and can further bond to the fibers exposed in the overlap structure 309 (e.g., the second fiber portion 312), thereby further enhancing the adhesion between the resin layer 420 and the lid 300B. In other words, a lid using a paper-based substrate having heat-sealing properties as a non-plastic material can be obtained. Furthermore, as described in the application examples below, a container with a lid or a combination of a lid and a container can be obtained using a lid made of a paper-based substrate having heat-sealing properties as a non-plastic material.

[0182] (3) Modifications (Modification 1) The cover 300B according to the first embodiment may be appropriately processed. Examples of the processing include adding a component for imparting functionality to the main body 303, or joining another member to the main body 303.

[0183] The lid 300B according to the first embodiment may be formed with a socket 319, as shown in Figures 33A and 33B, for example. An example of a lid configured in this manner is referred to as Modification 1 of the first embodiment. Figures 33A and 33B are a plan view and a cross-sectional view, respectively, that schematically show an example of the lid 300B according to Modification 1 of the first embodiment. Also, Figure 33B is a view that schematically shows the state of the vertical cross section taken along line CC in Figure 33A.

[0184] (Inlet Port) The outlet port 319 is a structural component that allows various items to be inserted into the container 401 from the outside when the lid 300B is used in the lid-equipped container 450. Examples of insertable items include a straw. The outlet port 319 is formed at least in the lid region corresponding portion 305B, and in the example shown in Figures 33A and 33B, it is formed as a through-hole. The through-hole has a structure (a penetrating structure) cut in the vertical direction (thickness direction, Z-axis direction) from one surface (exposed surface 372) of the main body 303 to the other surface (opposing surface 373), and is a so-called notch 318. This through-hole can function as a gas vent. Here, the gas vent refers to a portion that allows gas to pass from one surface side of the lid 300B to the other surface side (from the opposing surface 373 side to the exposed surface 372 side).

[0185] (Modification 2) In the cover 300B according to the first embodiment, a water-repellent treatment may be applied to a predetermined area (Modification 2).

[0186] (Water-repellent Treatment) The water-repellent treatment applicable to the second modification of the first embodiment is not particularly limited, and examples thereof include a method of immersing the paper substrate 304 in a treatment liquid, lifting the immersed paper substrate 304, and then drying it. Another example of the water-repellent treatment is a method of applying a treatment liquid to the surface of the paper substrate 304. Specific examples of the application method include printing methods. Examples of printing methods include coating methods such as roll coating and spray coating, gravure printing, and screen printing.

[0187] The treatment liquid may be a liquid containing a water repellent, such as a fluorine-based water repellent or wax.

[0188] 27C , the lid 300B according to the second embodiment has the same configuration as the first embodiment, except that the second fiber portions 312 forming the raised structure 310 of the paper-based substrate 304 are configured to bend toward the first fiber portions 311 to form the overlapping structure 309 when the main body 303 is joined to the container main body 410 via the adhesive substance 302. Fig. 27C is an enlarged cross section for explaining one example of the second embodiment.

[0189] (Second Fiber Segment) Before the main body 303 is bonded to the container body 410 via the adhesive substance 302, the second fiber segments 312 have portions that rise in a direction away from the first fiber segments 311 (slightly in the −Z direction in FIG. 27A ) (portions that hang diagonally in FIG. 27A ) as shown in FIG. 27A . When the main body 303 is bonded to the container body 410 via the adhesive substance 302, the second fiber segments 312 move closer to the first fiber segments 311 overall, as shown in FIG. 27C , while gaps 314 remain between the first fiber segments 311 and the second fiber segments 312. When the main body 303 is bonded to the container body 410 via the adhesive substance 302, the first fiber segments 311 and the second fiber segments 312 form an overlapping structure 309. Regarding the size of the gap 314 formed between the first fiber part 311 and the second fiber part 312, the size is maintained to a degree that allows the adhesive substance 302 to penetrate into the gap 314, both before and after joining the main body 303 to the container main body 410 via the adhesive substance 302.

[0190] (2) Functions and Effects According to the cover according to the second embodiment, the same effects as those of the first embodiment can be obtained.

[0191] 30A and 30B, the lid 300B according to the third embodiment has the same configuration as the first embodiment except that it has a configuration in which a space 315 is formed between a first fiber portion 311 and a second fiber portion 312 that form a rising structure 310 of a paper-based substrate 304. Figures 30A and 30B are enlarged cross-sectional views for explaining an example of the third embodiment.

[0192] (Space) The space 315 has an opening that can receive resin (such as the adhesive material 302) from the outside. In the example of Fig. 30A, the opening is formed in the front-to-back direction of the paper on which the drawing is drawn, and the space 315 is closed by the first fiber portion 311 and the second fiber portion 312 in the plane direction of the paper. In the third embodiment, the size of the space 315 is such that the adhesive material 302 can enter the space 315 from the opening when the main body 303 is joined to the container main body 410 via the adhesive material 302.

[0193] (2) Functions and Effects According to the cover according to the third embodiment, the same effects as those of the first embodiment can be obtained.

[0194] 31A and 31B, the lid 300B according to the fourth embodiment has the same configuration as the first embodiment except that the first fiber portions 311 and the second fiber portions 312 are connected to each other and that the first fiber portions 311 and the second fiber portions 312 form branched portions 316. Figures 31A and 31B are enlarged cross-sectional views for explaining an example of the fourth embodiment.

[0195] (Branched Portion) The branched portion 316 has an opening that can receive a resin (such as the adhesive material 302) from the outside. In the example of FIG. 31A , one end of the gap 314 between the first fiber portion 311 and the second fiber portion 312 is open, and the other end of the gap 314 forms a portion (connecting portion 316A) where the first fiber portion 311 and the second fiber portion 312 are connected. The branched portion 316 also serves as the overlapping structure 309. In the third embodiment, the gap 314 between the first fiber portion 311 and the second fiber portion 312 formed in the branched portion 316, like the overlapping structure 309, is large enough to allow the adhesive material 302 to enter the gap 314 arranged on the surface of the paper-based substrate 304 when the main body 303 is joined to the container main body 410 via the adhesive material 302.

[0196] (2) Functions and Effects According to the cover according to the fourth embodiment, the same effects as those of the first embodiment can be obtained.

[0197] [9-5 Fifth Example of Form A2] [(1) Structure] As shown in Figures 32A and 32B, the lid body 300B of the fifth example has the same structure as the first example, except that it has a structure in which a third fiber part 313 is interposed between a first fiber part 311 and a second fiber part 312 that form a superimposed structure 309 of a paper-based substrate 304. In the fifth embodiment, the gap (first gap 314A) between the first fiber part 311 and the third fiber part 313 and the gap (second gap 314B) between the third fiber part 313 and the second fiber part 312 are both large enough that when the main body 303 is joined to the container main body 410 via the adhesive substance 302, the adhesive substance 302 can penetrate toward the exposed surface 372 (i.e., into the first gap 314A and the second gap 314B) beyond the fibers 306 arranged on the surface of the paper-based substrate 304.

[0198] (2) Functions and Effects According to the cover 300B of the fifth embodiment, the same effects as those of the first embodiment can be obtained.

[0199] In the lid body of the present invention, the configurations shown in the first to fifth embodiments may be appropriately combined (may coexist), i.e., in the lid body of the present invention, for example, the configuration of the first and second fiber portions shown in the first embodiment and the configuration of the first and second fiber portions shown in the second embodiment may coexist.

[0200] [9-6 Application Example of Lid of Form A2] The lid 300B described above can be used in a lidded container 450 as shown in Figures 25A and 25B. Figure 25A is a perspective view showing an example in which the lid 300B is joined to an edge 403 that forms the outer periphery of an opening 402 of a container 401 having an opening 402 formed at its upper end. Figure 25B is a cross-sectional view that schematically shows the state of the vertical cross section of Figure 25A. The explanation of the lidded container 450 will continue with reference to Figures 25A and 25B.

[0201] (Container with Lid) The container with lid 450 has a joint 451 where the container 401 and the lid 300B are joined, and the area of ​​the lid 300B where the joint 451 is formed is the joining area RA. The method for joining the lid 300B and the container 401 is not particularly limited, and any joining method such as thermal fusion (heat sealing) can be used as appropriate. The following describes an example where the lid 300B according to the first embodiment is used as the container with lid 450.

[0202] The container 401 has a container body 410 having a cylindrical sidewall 404 and a bottom 407 that increase in diameter upward (or taper downward), forming a space 405 therein, and an opening 402 that opens at the upper end of the container body 410 (the upper end of the sidewall 404). Although not shown, the opening 402 of the container 401 is circular. However, the container 401 shown here is merely an example and is not intended to limit the configuration of the container 401. For example, the opening 402 of the container 401 may be rectangular. The container 401 may be any container as long as the opening 402 can be covered with the lid 300B. Furthermore, the substance stored inside the container 401 (space 405) is not particularly limited, and examples include liquid substances, or a combination of liquid substances and solid substances.

[0203] 25A and other drawings, the container 101 has a flange portion at the edge 403 of the opening 402. The flange portion may be a curled portion 408 formed by outwardly winding a member forming the container body 410, or may be formed as a portion (a flange portion) that extends outward on a plane.

[0204] In the container 401, the container body 410 preferably has a resin layer 420 formed on at least the surface of the rim 403. In the example of FIG. 26C , the resin layer 420 is formed over the entire area from the inner circumferential surface 406 of the container body 410 to the surface of the rim 403. In this case, the resin layer 420 is preferably a resin that can function as the adhesive material 302. With this configuration, the resin layer 420 can function as the adhesive material 302. That is, the lid can be attached to the container 401 by heat sealing or the like without applying a separate adhesive or the like to the container 401. Note that, when the resin layer 420 is formed on the container body 410, it is sufficient that the resin layer 420 is formed on at least the surface of the rim 403; the resin layer 420 may be omitted from the inner circumferential surface 406 of the container body 410. Alternatively, the container body 410 may be formed by processing a sheet material containing paper fibers. In such a case, as shown in FIG. 26B etc., the container body 410 has fibers 421 such as paper fibers.

[0205] The lid 300B may also be combined with a container 401 having an opening 402 .

[0206] The cover 300B of form A2 will be further described with reference to an example.

[0207] Example 1: A lid and a container as shown in Figure 23 were prepared, and a container with a lid was obtained using a heat sealing method. The container used had a container body formed by processing a sheet material containing paper fibers, with a continuous resin layer formed on the edge surface and the entire inner surface area (whole area). The container shape used was as shown in Figures 25A and 25B. The temperature during the heat sealing method was 200°C.

[0208] The bonded portion between the rim and the lid of the resulting lidded container was observed using an electron microscope (magnification: 100x). The results are shown in Figure 34. In Figure 34, symbol A1 indicates the container body of the container, symbol B1 indicates the body of the lid, symbol C1 indicates the resin layer, and symbol C2 indicates the resin constituting the resin layer. Symbols B2 and B3 indicate the first and second fiber portions, respectively, and symbol B4 indicates a gap. This confirmed that the resin C2 constituting the resin layer C1 had penetrated into the gap B4 between the fibers (first fiber portion B2 and second fiber portion B3) constituting the lid, and that the resin layer C1 functioned as an adhesive substance.

[0209] As described above, the lid according to the present invention can be applied to many of these lid configurations (Embodiments 1 to 5 and Form A). It can also be applied to lid configurations other than those described above (e.g., lid 10, lid 300A, lid 300B). The lid according to the present invention has been described in detail above, but the above examples are merely examples of the lid according to the present invention and are not intended to be limiting. Therefore, modifications may be made as appropriate within the scope of the present invention. Furthermore, the configurations of the lids described above may be used independently, or the configurations of the lids may be combined as appropriate. For example, the configuration shown in Form A2 may be combined with the fifth embodiment.

[0210] Based on the above description of this specification, the present invention may adopt the following configurations [E1] to [E11]: [E1] A lid configured to be attachable to a container having an opening and an edge forming the opening, and having a top surface portion that covers the opening when attached to the container, the top surface portion comprising a paper-based substrate made of a paper-based material, a through-hole that penetrates the paper-based substrate, a gas-liquid separating material capable of separating the gas in the gas phase and at least a portion of the liquid in the liquid phase from a mixed fluid having a gas phase and a liquid phase, and a thermoplastic coating agent, the gas-liquid separating material having a paper-based breathable sheet that contains long fibers and has breathability, and a liquid repellent that imparts liquid repellency to the paper-based breathable sheet is disposed on at least one surface of the paper-based breathable sheet, the gas-liquid separating material is disposed so as to cover at least a portion of the through-hole in a plan view of the paper-based substrate, and the coating agent bonds the gas-liquid separating material to the paper-based substrate. [E2] The lid according to [E1] above, wherein the liquid repellent agent is a water repellent agent. [E3] The lid according to [E1] or [E2] above, wherein the paper-based breathable sheet is a nonwoven fabric. [E4] The lid according to any one of [E1] to [E3] above, wherein the long fibers are paper fibers. [E5] The lid according to any one of [E1] to [E4] above, wherein the liquid repellent agent is adhered to at least a portion of the long fibers. [E6] The lid according to any one of [E1] to [E5] above, wherein the liquid repellent agent is also disposed inside the paper-based breathable sheet. [E7] The lid according to any one of [E1] to [E6] above, wherein the gas-liquid separating material has a notch and / or a half-cut portion formed at a position determined to correspond to the through-hole. [E8] The lid according to any one of [E1] to [E7] above, wherein the gas-liquid separating material contains the long fibers as a main component. [E9] A container with a lid, comprising: the lid according to any one of [E1] to [E8] above; and a container having an opening formed at an upper end and an edge forming the outer periphery of the opening, wherein the lid is joined to the container.[E10] A combination of a lid and a container, comprising: the lid according to any one of [E1] to [E8] above; and the container having the opening formed at the top end and an edge portion forming the outer periphery of the opening.

[0211] Based on the above description of this specification, the present invention encompasses the gas-liquid separating materials shown in the following [F1] to [F17]. [F1] A gas-liquid separating material comprising a paper-based substrate made of a paper-based material, a through-hole penetrating the paper-based material, a gas-liquid separating material capable of separating a gas phase gas and at least a portion of a liquid phase liquid from a mixed fluid having a gas phase and a liquid phase, and a thermoplastic coating agent. [F2] The gas-liquid separating material according to [F1] above, in which the liquid-repellent agent is a water-repellent agent. [F3] The gas-liquid separating material according to [F1] or [F2] above, in which the paper-based breathable sheet is a nonwoven fabric. [F4] The gas-liquid separating material according to any one of [F1] to [F3] above, in which the long fibers are paper fibers. [F5] The gas-liquid separating material according to any one of [F1] to [F4] above, in which the liquid-repellent agent is adhered to at least a portion of the long fibers. [F6] The gas-liquid separating material according to any one of [F1] to [F5] above, wherein the liquid repellent agent is also disposed inside the paper-based breathable sheet. [F7] The gas-liquid separating material according to any one of [F1] to [F6] above, wherein the gas-liquid separating material contains the long fibers as a main component.

[0212] Furthermore, based on the description of the lid according to Form A (Form A1 and Form A2) in this specification, the present invention may employ the following configurations [G1] to [G7]. [G1] A lid comprising: a container body having an opening formed at an upper end and a rim that forms the outer periphery of the opening; a body formed to be joinable via an adhesive to the container body, the body having a paper-based substrate having a plurality of paper fibers as fibers; the body having a joining area corresponding portion corresponding to the joining area defined as an area to be joined to the container along the rim of the container; and a lid area corresponding portion formed inward from the joining area corresponding portion; assuming a state in which the body and the container body are joined via the adhesive substance, and assuming that the surface of the body that faces the container is the opposing surface and the surface opposite the opposing surface is the exposed surface, the paper-based substrate has a superimposed structure in which the paper fibers are overlapped so that the adhesive substance can penetrate toward the exposed surface further than the paper fibers arranged on the surface of the paper-based substrate when the body is joined to the container body via the adhesive substance; and at least a part of the superimposed structure of the paper-based substrate is exposed on at least a part of the surface of the joining area corresponding portion on the opposing surface side.1. A lid comprising: a container body having an opening formed at an upper end and an edge that forms the outer periphery of the opening, the container body being formed so as to be joinable via an adhesive substance to the container body, the container body having a paper-based substrate having a plurality of paper fibers as fibers; the container body having a joining area corresponding portion that corresponds to a joining area defined as an area to be joined to the container along the edge of the container, and a lid area corresponding portion that is formed inward from the joining area corresponding portion; assuming a state in which the container body and the container body are joined via the adhesive substance, and assuming that one of the surfaces of the container body that faces the container is an opposing surface and the other surface opposite the opposing surface is an exposed surface, the paper-based substrate has a superimposed structure in which the paper fibers are overlapped so that, when the container body is joined to the container body via the adhesive substance, the adhesive substance can penetrate toward the exposed surface further than the paper fibers arranged on the surface of the paper-based substrate; and at least a portion of the superimposed structure of the paper-based substrate is exposed on at least a portion of the surface of the joining area corresponding portion that faces the opposing surface. [G2] The lid described in [G1] above, wherein the overlapping structure of the paper-based substrate has a first fibrous portion composed of the fibers located on the exposed surface side, a second fibrous portion composed of the fibers located more inward in the thickness direction of the paper-based substrate than the first fibrous portion, and a space formed between the first fibrous portion and the second fibrous portion, and when the main body is bonded to the container main body via the adhesive substance, the adhesive substance enters at least a part of the space. [G3] The lid described in [G1] above, wherein the overlapping structure of the paper-based substrate has a first fibrous portion composed of the fibers located on the exposed surface side, and a second fibrous portion composed of the fibers located more inward in the thickness direction of the paper-based substrate than the first fibrous portion, and the first fibrous portion and the second fibrous portion are connected to each other, and a branched portion is formed between the first fibrous portion and the second fibrous portion. [G4] A container with a lid, comprising: the lid according to any one of [G1] to [G3] above; and a container having the container body with the opening formed at the top end, wherein the lid is bonded to the container via the adhesive substance.[G5] The container with lid described in [G4] above, wherein the container body has a resin layer formed on at least the surface of the edge, and the adhesive substance is a resin that constitutes the resin layer. [G6] A combination of a lid and a container, comprising: the lid described in any one of [G1] to [G3] above; and a container having the container body with the opening formed at its upper end, wherein the container body has a resin layer formed on at least the surface of the edge, and the resin layer is a resin that can function as the adhesive substance. [G7] A lid including a body having a paper-based substrate containing a plurality of paper fibers as fibers, and having an opening formed at its upper end and an edge that forms the outer periphery of the opening, and formed to be joinable to a container having a resin coating layer on its surface, wherein the body has a joining area corresponding portion that corresponds to a joining area defined along the edge of the container as the area to be joined to the container, and has a portion that exposes the surface of the paper-based substrate, and is configured so that the resin coating layer can be adhered to at least a portion of the joining area corresponding portion.

[0213] DESCRIPTION OF SYMBOLS 10: Lid 10A: Lid 10B: Lid 10C: Lid 10D: Lid 11: Top surface 11A: Outer peripheral edge 11B: Underside 12: Bent portion 13: Side wall 13A: Inner peripheral surface 13B: Outer peripheral surface 14: Small wall 14A: First small wall 14B: Second small wall 15: Small wall joint 16: Insertion opening 17: Through portion 18: Mouth-forming structure 18A: Small opening 18B: Small lid 18C: Hinge portion 18D: Base 19: Tab member 20: Port 26: Projection 31: Base end 31A: End 31B: End 32: Front edge 33: Side edge 33A: First side edge 33B: Second side edge 34: Inner surface 35: Outer surface 40: Main body 41: Paper-based base material 42: Gas-liquid separating material 43: Paper-based breathable sheet 43A: Fiber 44: Liquid repellent agent 45: Cut portion 46: Half-cut portion 47: Gap between fibers 48: Coating agent 49: Separation paper joint portion 50: Blank material 51: Fold margin portion 52: First corresponding portion 53: Second corresponding portion 54: Cut portion 55: Sheet material 72: Exposed surface 73: Opposing surface 74: Peripheral edge 80: Gas-liquid separating material 82: Non-joined portion 83: Gap 95A: Joint region corresponding portion 95B: Lid region corresponding portion 95C: Portion corresponding to outer region 101: Container 102: Opening 103: Edge 104: Side wall 105: Space 107: Bottom 108: Curled portion 110: Container body 111: Outer peripheral surface 150: Container with lid 151: Contact portion 201: Lid 202: Top surface 203: Side wall 205: Upper wall 206: Lower wall 222: Canopy-forming member 223: Side wall-forming member 224: Recess 225: Convex portion 226: Protruding portion 226A: Inner surface 227: Recessed portion 228A: Inner end 228B: Outer end 230: Joint margin 231: First portion 232 : Second portion 233 : First contact wall portion 234 : Second contact wall portion 235 : Continuous portion236: Side wall upper end curled portion 237: Lower first contact wall portion 238: Lower second contact wall portion 239: Lower end side continuous portion 251: First blank material 252: Second blank material 253: Edge portion 290: Main body 291: Top surface portion 292: Concave and convex 292A: Portion 292B: Portion 295A: Joining region corresponding portion 295B: Lid region corresponding portion 295C: Outer region corresponding portion 298: Exposed surface 299: Opposing surface 300A: Lid body 300B: Lid body 302: Adhesive substance 303: Main body 304: Paper-based base material 305A: Joining region corresponding portion 305B: Lid region corresponding portion 305C: Outer region corresponding portion 306: Fiber 306A: Paper fiber 307: Uneven structure 308: Receiving structure 309: Overlapping structure 310: Standing structure 311: First fiber portion 311A: Fiber portion 311B: Fiber portion 311C: Fiber portion 312: Second fiber portion 312A: Fiber portion 312B: Fiber portion 312C: Fiber portion 313: Third fiber portion 314: Gap 314A: First gap 314B: Second gap 315: Space portion 316: Portion 316A: Connecting portion 318: Notch portion 319: Insertion port 372: Exposed surface 373: Opposing surface 401: Container 402: Opening 403 : Edge portion 404 : Side wall 405 : Space portion 406 : Inner peripheral surface 407 : Bottom portion 408 : Curled portion 410 : Container body 420 : Resin layer 421 : Fiber 450 : Container with lid 451 : Joint portion B2 : First fiber portion B3 : Second fiber portion B4 : Gap BC : Predetermined portion C1 : Resin layer CB : Center CT : Center DR : Arrow EI : Region EI : Region FD : Arrow FGA : Gas FLI : Liquid FR : Predetermined portion FW : Mixed fluid OVL : Overlap area R : Contact region RA : Joint region RN : Joint region Rz : Maximum height WK : Region XA : Region XR1 : Region XR2: Area XRA: Area XS1: Area XS2: Area XS3: Area XS4: Area

Claims

1. A lid configured to be attached to a container having an opening and an edge that defines the opening, and having a top surface that covers the opening when attached to the container, the top surface comprising a paper-based base material made of a paper-based material, a through-hole that penetrates the paper-based base material, a gas-liquid separating material capable of separating a gas in the gas phase and at least a portion of a liquid in the liquid phase from a mixed fluid having a gas phase and a liquid phase, and a coating agent having thermoplastic properties, the gas-liquid separating material having a paper-based breathable sheet that contains long fibers and has breathability, a liquid repellent agent that imparts liquid repellency to the paper-based breathable sheet is disposed on at least one surface of the paper-based breathable sheet, the gas-liquid separating material is disposed so as to cover at least a portion of the through-hole in a plan view of the paper-based base material, and the coating agent bonds the gas-liquid separating material and the paper-based base material.

2. The lid according to claim 1, wherein the liquid repellent is a water repellent.

3. The lid according to claim 1, wherein the paper-based breathable sheet is a nonwoven fabric.

4. The lid according to claim 1, wherein the long fibers are paper fibers.

5. The lid according to claim 1, wherein the liquid repellent is adhered to at least a portion of the long fibers.

6. The lid according to claim 1, wherein the liquid repellent agent is also disposed inside the paper-based breathable sheet.

7. The lid according to claim 1, wherein the gas-liquid separating material has a notch and / or a half-cut portion formed at a position determined to correspond to the through-hole.

8. The lid according to claim 1, wherein the gas-liquid separating material contains the long fibers as a main component.

9. A container with a lid, comprising: the lid according to claim 1; and a container having an opening formed at an upper end and a rim forming the outer periphery of the opening, the lid being joined to the container.

10. A combination of a lid and a container comprising the lid according to claim 1 and the container having an opening formed at an upper end and a rim forming an outer periphery of the opening.

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