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

Abstract

To provide a lid that uses a paper-based material, is capable of preventing leakage of contents from a container with the lid, and improves recyclability, and to provide a container with the lid and a combination of the lid and the container.SOLUTION: A lid is configured so as to be attached to a container having an opening part and an edge part forming the opening part. The lid 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; a penetration part penetrating through 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 having 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 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. The coating agent bonds the gas-liquid separation material to the paper-based base material.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related 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] As the lid to be attached to the container, from the viewpoint of reducing the use of petroleum raw materials as a reduction in environmental load, it is required to use a paper-based material. Methods of attaching a lid to a container include a method of joining the lid to the edge forming the outer periphery of the upper opening of the container using a method such as heat pressing (sealing method) and a method of fitting the lid into the container (fitting method). In order to take the contents from a container to which a lid is attached (a container with a lid), as shown in Patent Document 1, the lid is peeled off (removed) from the edge of the container, or when the lid is attached to the container by the fitting method, the lid is removed from the container. In addition, a penetration part is provided in the lid, and a member for taking out the contents (e.g., a straw, etc.) is inserted into the penetration part (forming an insertion port). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-84128 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the lid has a penetration part, there is room for improvement in terms of preventing the contents from spilling out onto the lid from the penetration part while the lid covers the opening of the container. In particular, when the contents are, for example, hot beverages or cold carbonated beverages that emit steam or gas, there is a demand for improvement in the lid in terms of preventing the liquid components of the contents from leaking out to the outside when the liquid is caught in the released steam or gas as the pressure inside the lid-equipped container increases.

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

[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. [Means for solving the problem]

[0008] The present invention relates to the following (1) to (10).

[0009] (1) A lid that is configured to be attached to a container having an opening and an edge that forms the opening, and has 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 that can separate 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 (1) above, wherein the liquid repellent is a water repellent. (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 position determined to correspond 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 described in (1) above and a container having an opening formed at an upper end and an edge forming an outer periphery of the opening, and the lid is 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 upper end and an edge forming the outer periphery of the opening. Effect of the Invention

[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 a container with a lid, and are recyclable. [Brief description of the drawings]

[0011] [Figure 1] Fig. 1A is a plan view for explaining an example of a lid according to the first embodiment. Fig. 1B is a side view for explaining an example of a lid according to the first embodiment. Fig. 1C is a cross-sectional view showing a schematic state of a vertical section taken along line AA in Fig. 1A. Fig. 1D is a cross-sectional view showing a schematic state of a vertical section taken along line BB in Fig. 1B. [Diagram 2] 2A and 2B are diagrams showing an embodiment of a gas-liquid separating material. [Diagram 3] Fig. 3A is a diagram showing an embodiment of a gas-liquid separating material, and Figs. 3B, 3C and 3D are diagrams for explaining a state in which a liquid repellent agent is attached to a fiber. [Figure 4] 4A and 4B are plan views for explaining another example of the cover according to the first embodiment. [Diagram 5] Fig. 5A is a plan view for explaining another example of the lid according to the first embodiment, Fig. 5B is a bottom view for explaining another example of the lid according to the first embodiment, and Fig. 5C is a cross-sectional view showing a schematic state of a vertical cross section taken along line CC in Fig. 5A. [Figure 6] Fig. 6A is a plan view for explaining an example of a cover according to Modification 5 of the first embodiment, and Fig. 6B is a cross-sectional view showing a schematic vertical cross section taken along line DD in Fig. 6A. [Figure 7] Fig. 7A is a plan view for explaining an example of a blank for forming a lid according to the first embodiment. Fig. 7B is a cross-sectional view showing a schematic state of a vertical section taken along line EE in Fig. 7A. Fig. 7C is a view for explaining an example of a process for shaping a blank. Fig. 7D is a view for explaining a state of the blank in Fig. 7C when viewed from the direction of arrow DR. [Figure 8]Fig. 8A is a plan view for explaining an example of a cover according to Modification 6 of the first embodiment, and Fig. 8B is a cross-sectional view showing a schematic vertical cross section taken along line FF in Fig. 8A. [Figure 9] Fig. 9A is a plan view for explaining an example of a cover according to Modification 7 of the first embodiment. Fig. 9B is a cross-sectional view showing a schematic cross-section along line GG in Fig. 9A. Fig. 9C is a cross-sectional view showing an enlarged state of an area EI surrounded by a dashed line in Fig. 9B. [Figure 10] Fig. 10A is a perspective view for explaining one example of a cover according to the second embodiment, and Fig. 10B is a cross-sectional view showing a schematic vertical cross section taken along line HH in Fig. 10A. [Figure 11] Fig. 11A is a perspective view for explaining one example of a lid according to the third embodiment, and Fig. 11B is a cross-sectional view showing a schematic vertical cross section taken along line JJ in Fig. 11A. [Figure 12] Fig. 12A is a perspective view for explaining one example of a cover according to the fourth embodiment, and Fig. 12B is a cross-sectional view showing a schematic vertical cross section taken along line KK in Fig. 12A. [Figure 13] Fig. 13A is a plan view for explaining an example of a lid according to the fifth embodiment, Fig. 13B is a rear view for explaining an example of a lid according to the fifth embodiment, and Fig. 13C is a cross-sectional view showing a schematic state of a vertical cross section taken along line LL in Fig. 13A. [Figure 14] 14A and 14B are plan views for explaining an example of a blank for forming the lid according to the second embodiment. [Figure 15] Fig. 15A is a perspective view for explaining one embodiment of a container with a lid, and Fig. 15B is a cross-sectional view showing a schematic vertical cross section taken along line MM in Fig. 15A. [Figure 16] Fig. 16A is a perspective view for explaining one embodiment of a container with a lid, and Fig. 16B is a cross-sectional view showing a schematic vertical cross section taken along line NN in Fig. 16A. [Figure 17]Fig. 17A is a plan view for explaining an example of a lid according to Modification 1 of the first embodiment, Fig. 17B is a side view for explaining an example of a lid according to Modification 1 of the first embodiment, and Fig. 17C is a cross-sectional view showing a schematic state of a vertical cross section taken along line II in Fig. 17A. [Figure 18] Fig. 18A is a plan view for explaining an example of the lid according to the first embodiment, Fig. 18B is a side view for explaining an example of the lid according to the first embodiment, and Fig. 18C is a cross-sectional view showing a schematic state of a vertical cross section taken along line OO in Fig. 18A. [Figure 19] Fig. 19A is a plan view for explaining an example of the lid according to the first embodiment, Fig. 19B is a side view for explaining an example of the lid according to the first embodiment, and Fig. 19C is a cross-sectional view showing a schematic state of the vertical cross section taken along line PP in Fig. 19A. [Figure 20] Fig. 20A is a plan view showing an example of the lid according to the embodiment A1, and Fig. 1B is a cross-sectional view showing the state of a vertical cross section taken along line QQ. [Figure 21] Fig. 21A is an enlarged cross-sectional view showing a schematic enlargement of an area XR1 surrounded by a dashed line in Fig. 20A, and Fig. 21B is an enlarged cross-sectional view showing a schematic enlargement of an area XR2 surrounded by a dashed line in Fig. 20B. [Figure 22] Fig. 22A is a perspective view showing one embodiment of a container with a lid, and Fig. 22B is a cross-sectional view showing a schematic vertical cross section taken along line RR in Fig. 22A. [Figure 23] Fig. 23A is a plan view showing an example of a lid according to a first embodiment of form A2, and Fig. 23B is a cross-sectional view showing a state of a longitudinal section taken along line SS. [Figure 24] Fig. 24A is an enlarged cross-sectional view of an area XS1 surrounded by a dashed line in Fig. 23B, Fig. 24B is an enlarged cross-sectional view of an area XS2 surrounded by a dashed line in Fig. 24A, and Fig. 24C is an enlarged plan view of an example of fiber intersection. [Diagram 25]Fig. 25A is a perspective view showing one embodiment of a container with a lid, and Fig. 25B is a cross-sectional view showing a schematic vertical cross section taken along line TT in Fig. 25A. [Figure 26] Fig. 26A is an enlarged cross-sectional view showing a schematic enlargement of an area XS3 surrounded by a dashed line in Fig. 26B, Fig. 26B is an enlarged cross-sectional view showing a schematic enlargement of an area XS4 surrounded by a dashed line in Fig. 26A, and Fig. 26C is an enlarged cross-sectional view showing a schematic enlargement of an area XA surrounded by a dashed line in Fig. 26B. [Figure 27] 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. [Figure 28] 28A and 28B are enlarged cross-sectional views showing one embodiment of the lid according to the first embodiment. [Figure 29] 29A, 29B, and 29C are enlarged cross-sectional views showing an embodiment of the position of the receiving structure in the lid according to the first embodiment. [Diagram 30] Fig. 30A is an enlarged cross-sectional view showing an example of the lid according to the third embodiment, and Fig. 30B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the third embodiment. [Diagram 31] Fig. 31A is an enlarged cross-sectional view showing an example of the lid according to the fourth embodiment, and Fig. 31B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the fourth embodiment. [Diagram 32] Fig. 32A is an enlarged cross-sectional view showing one embodiment of the lid according to the fifth embodiment. Fig. 10B is an enlarged cross-sectional view showing one embodiment of a lidded container using the lid according to the fifth embodiment. [Diagram 33] Fig. 33A is a plan view showing one embodiment of the lid according to the first embodiment, Fig. 11B is a cross-sectional view showing the state of a vertical cross section taken along line UU. [Diagram 34] FIG. 1 is a diagram for explaining the results of Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0013] The following description is a preferred specific example of the present invention, and the contents of the present invention are not limited to the embodiments described. In the following description, directions such as front-back, left-right, and up-down are shown for convenience of explanation, but the contents of the present invention are not limited to these directions. In the example of Fig. 1 and Fig. 2, the Z axis direction is the up-down direction (upper side is +Z direction, lower side is -Z direction), the X axis direction is the front-back direction (front side is +X direction, rear side is -X direction), and the Y axis direction is the left-right direction (right side is +Y direction, left side is -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 Fig. 1 are described for convenience and do not limit the actual size ratios. The definitions of these directions and size ratios are the same for each drawing from Fig. 2 to Fig. 33.

[0015] The lid according to the present invention will be described as an example of a lid used for a container (cup) for holding a fluid such as various beverages, such as a coffee cup, but it is not limited to a lid for a container for holding beverages, and can also be applied as a lid for a container for holding foodstuffs having liquid other than beverages. In addition, the lid according to the present invention is not prohibited from being applied to a container that can hold various items having liquid other than food and beverages. Furthermore, in the following, the lid according to the present invention will be described using an example of a lid that has a circular shape when viewed in a plane, but the shape of the lid is not limited to a circular shape when viewed in a plane, and can be applied to various shapes other than a circle, such as an elliptical shape, a rectangular shape, a polygonal shape such as a triangular shape, a chamfered rectangular shape, a chamfered polygonal shape, etc. However, from the viewpoint of further enhancing the effect of the present invention, it is preferable that the lid is attached to a container that contains a mixed fluid or a material having the 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 of such a mixed fluid 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 an edge 103 of an opening 102 of a container 101, as described later with reference to Figure 15 etc. The lid 10 is formed so that a contact region R that comes into contact with the edge 103 of the container 101 having the opening 102 can be formed on the opposing surface of the lid 10.

[0018] In this specification, the opposing surface 73 of the lid 10 refers to the surface opposite to the exposed surface 72, and the exposed surface 72 of the lid 10 refers to the surface 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 10 that faces the container 101 in the state of the container with lid 150. In the description of each part constituting the lid 10, for example, with respect to the surfaces of the top surface portion 11, etc., the surface facing the same direction as the exposed surface 72 of the lid 10 may be simply referred to as the exposed surface, and the surface facing the same direction as the opposing surface 73 of the lid 10 may be simply referred to as the opposing surface.

[0019] The lid 10 has a top surface portion 11. In the example shown in Fig. 1A to Fig. 1D, the lid 10 has a main body 40 having the top surface portion 11. The main body 40 of the lid 10 further has a bent portion 12 and a side wall portion 13 as necessary, as shown in the example of Fig. 1A or Fig. 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 limited thereto. 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] (Top part) 1A to 1D, when the lid 10 is attached (mounted) to the container 101, the top surface 11 becomes a portion that covers the opening 102 of 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] (Top surface material) The top surface portion 11 has a sheet-like base material. The material of the top surface portion 11 (the material of the sheet-like base material) can be a paper-based material, plastic, metal, etc., but from the viewpoint of recyclability and compatibility between the shape retention of the lid body 10 and environmental consideration (reduced use of petroleum resources), a paper-based material is preferable. Therefore, the top surface portion 11 preferably has a paper-based base material 41 (a sheet-like base material made of a paper-based material) made of a paper-based material. In the example of FIG. 1, it is preferable that the material of the side wall portion 13 and the curved portion 12 in addition to the top surface portion 11 has a paper-based material (i.e., the entire lid body 10 has a paper-based material).

[0022] Examples of paper-based materials include so-called papers obtained by spreading 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 airlaid sheets obtained by stacking spread fiber raw materials such as ground pulp obtained by crushing a raw material sheet made of pulp-based fibers or the like in a crusher, using an air flow to stack the fibers of the stack, and fixing them together with a binder; so-called papers produced by bonding vegetable fibers and other fibers; and sheets of these laminated together.

[0023] The paper-based material may be made of pulp alone or may contain non-pulp-based natural fibers, synthetic fibers, recycled fibers, etc., but is preferably made mainly of pulp (containing 50% by mass or more), more preferably containing 70% by mass or more, and even more preferably containing 80% by mass or more, and is particularly preferably made of 100% by mass of pulp. The paper-based material may be a composite material with a wood-based material such as wood foil, or even an aluminum foil, but when it is a composite material, it is preferable that the composite material contains 50% by mass or more of pulp as a whole, and is particularly preferable that it contains 80% by mass or more of pulp. The higher the pulp content, the easier the paper-based material is to biodegrade, which is preferable. The material of the lid 10 may also be preferably used as a laminate containing a paper-based material.

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

[0025] In addition to fibrous materials such as pulp, paper-based materials are not prohibited from containing various resins as long as they are not the main components. However, when the paper-based material contains various resins, it is preferable to select biodegradable resins that pose fewer environmental pollution problems. Examples of biodegradable resins include microbially produced biodegradable resins such as polyhydroxyalkanoates (PHAs) 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 others such as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product surface: Biorecover, product name: Cra Drop, etc.).

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

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

[0028] The through portion 17 has a structure (a structure that is cut through) from one side of the lid 10 to the other side (from the exposed surface 72 to the opposing surface 73) in the vertical direction (the thickness direction of the top surface portion 11), and is a so-called cut structure forming portion. The cut structure forming portion is a portion formed in a slit shape. The shape of the through portion 17 is not particularly limited, and in the example of FIG. 1, it is formed in a cross shape, but this is only an example and does not limit the shape of the through portion 17. The shape of the through portion 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 above-mentioned slit shape. 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 the member forming the main body 40 (the member forming the top surface portion 11) (such as a paper-based material), or may be a portion formed by punching the member forming the main body 40.

[0030] (Socket) In the example of Fig. 1, the top surface 11 is formed with an insertion port 16 for inserting a straw or the like from the outside, and this insertion port 16 is a structural part formed with the through-hole 17. That is, in the example of Fig. 1, the through-hole 17 forms a structural part that functions as the insertion port 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, and may be a structure that forms a vent hole that reduces the internal pressure of the container 101 in the state of the covered container 150. However, a structure that forms an opening (an opening formed on the inside of the top surface portion 11) for forming a drinking spout as described below (a structure having a small opening and a small lid portion that can open and close the small opening) is excluded.

[0032] The lid 10 is provided with a gas-liquid separating material 42 on the top surface 11 of the main body 40. The gas-liquid separating material 42 functions as a breathable sheet. The gas-liquid separating material 42 is disposed at least on the surface of the top surface 11, on the side of the surface 73 facing the container 101. The breathable sheet refers to a sheet having breathability to the extent that gas such as carbon dioxide or steam (water vapor, etc.) can pass through from the surface facing one side (the opposing surface 73 of the lid 10) of the breathable sheet to the surface facing the other side (the exposed surface 72 of the lid 10) (the surface facing the main body 40). Gas such as carbon dioxide or steam (water vapor, etc.) may be collectively referred to as "gas, etc.".

[0033] (gas-liquid separation material) The gas-liquid separating 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 separating 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 is mainly composed of long fibers. When the paper-based breathable sheet 43 contains long fibers, paper fibers are preferably used as the long fibers. "Mainly composed" means that 50% by mass or more of the fibers constituting 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 separating material is preferably a material that can be called gas-liquid separating 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 preferable from the viewpoint of maintaining the fiber length in a relatively long state. Furthermore, for the pulp fibers, among wood pulps, unbleached kraft pulp (UKP), bleached kraft pulp (BKP), or a combination thereof is preferable, since base paper having excellent wet strength can be obtained from them. Unbleached pulp refers to wood pulp that has not been bleached. Bleached pulp refers to wood pulp that has been subjected to a bleaching process. Examples of bleaching methods for bleached pulp include bleaching methods that use alkali, chlorine, sodium hypochlorite, etc., bleaching methods that use chlorine dioxide, etc. (ECF (Elementary Chlorine Free) bleaching method), bleaching methods that use 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, hemp pulp, etc.

[0036] Further, the long fiber refers to a fiber having a fiber length (generally about 1 mm) or more of hardwood pulp (L-material), which is a relatively short fiber among pulp fibers usually used to form Western paper. As the long fiber, from the viewpoint of obtaining a paper-based breathable sheet having excellent wet strength, wood pulp fiber obtained from softwood pulp (N-material) is preferable. However, the fiber 43A contained in the paper-based breathable sheet 43 may be made of a material having the above-mentioned fiber length on average, and the case where the fiber 43A contains fibers having a length shorter than that of hardwood pulp (L-material) is not completely excluded. That is, the paper-based breathable sheet 43 may contain short fibers having a fiber length shorter than that of the long fiber. Specifically, for example, the paper-based breathable sheet preferably contains softwood pulp fibers, and does not necessarily exclude the inclusion of hardwood pulp fibers.

[0037] (Nonwoven fabric sheet) A nonwoven fabric sheet is preferably used as the paper-based ventilation 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 to each other by entanglement and / or fusion and / or adhesion, excluding paper, woven fabric, knitted fabric, tufted fabric and felted fabric." The nonwoven fabric constituting the paper-based ventilation sheet 43 is obtained by filtering the above-mentioned fibers (pulp fibers, etc.) with water or the like. The use of nonwoven fabric in the paper-based ventilation sheet 43 makes it possible to reduce manufacturing costs and to easily secure gaps between adjacent fibers 43A.

[0038] (Liquid repellent) 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. The 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 forming the paper-based breathable sheet 43, as shown in FIG. 2B. At least a part of the liquid repellent agent 44 is bonded to at least a part of the long fibers. From the viewpoint that the fibers 43A forming the paper-based breathable sheet 43 are preferably mainly composed of long fibers, it is preferable that the gas-liquid separating material 42 has a state in which the liquid repellent agent 44 is attached to the long fibers of the paper-based breathable sheet 43.

[0039] The liquid repellent 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 44 may be attached to the fibers 43A to such an extent that it can maintain a state of close contact with the fibers 43A. In the example of Fig. 2B, the liquid repellent 44 is attached in granular form to the surface of the fibers 43A, but as shown in Figs. 2C and 2D, the liquid repellent 44 may be attached so as to spread in the planar direction of the surface of the fibers 43A, or a layer of the liquid repellent 44 may be attached so as to cover the surface of the fibers 43A. The liquid repellent 44 may penetrate not only the surface of the fibers 43A but also the inside of the fibers 43A (not shown).

[0041] (Type of liquid repellent) 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 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 silicon-based water repellent agent, wax, or the like.

[0042] (Method of applying water repellent as liquid repellent) The method of attaching the water repellent agent can be a method of subjecting the paper-based breathable sheet to a water repellent treatment. The method of water repellent treatment is not particularly limited, and can be, for example, a method of immersing the paper-based breathable sheet in a treatment liquid, pulling up the immersed paper-based breathable sheet, and then drying it. In addition, the method of water repellent treatment can be a method of applying a treatment liquid to the surface of the paper-based breathable sheet. 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.

[0043] (Position of gas-liquid separator) In the lid 10, the gas-liquid separating material 42 is disposed 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 form a state in which the gas-liquid separating material 42 is disposed between the space 105 of the container 101 and the through-hole 17, and makes it possible to suppress 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 position determined to correspond to the through-hole 17. However, this does not prohibit the gas-liquid separating material 42 in the lid 10 from having the notch 45. In the container 150 with the lid, 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 easily passes downward through the gas-liquid separating material 42 from the position of the notch 45 of the gas-liquid separating material 42. In the example of FIG. 1, the notch 45 is located at or near the center position 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 deviated from the center position of the insertion port 16 as shown in FIG. 3A. In the example of FIG. 1, the cut portion 45 is formed in a straight line shape, the through portion 17 forming the insertion port 16 is formed in a cross shape, and the cut direction of the cut portion 45 is a direction shifted from the cut direction of the through portion 17 (directions out of phase with each other). This can prevent the mixed fluid in the container 101 from passing through the cut portion 45 and further passing through the through portion 17. In addition, in order to prevent the mixed fluid in the container 101 from passing through the cut portion 45, it is preferable that the gas-liquid separating material 42 has a half-cut portion 46 formed therein, as shown in FIG. 3B, instead of the cut portion 45. The gas-liquid separating material 42 has the half-cut portion 46 formed at a position determined to correspond to the through portion 17.

[0045] In addition, the shape of the cutout portion 45 is not limited to being different from the shape of the through-hole portion 17 forming the insertion port 16, and the shape of the cutout portion 45 may be the same as the shape of the through-hole portion 17 forming the insertion port 16, as shown in Figs. 5A to 5C. However, even in this case, it is preferable that the cutout direction of the cutout portion 45 is shifted from the cutout direction of the through-hole portion 17 (directions out of phase with each other) as shown in Figs. 5A to 5C (in Figs. 5A to 5C, the cutout direction of the cutout portion 45 rotated 45 degrees within the plane of the top surface portion 11 becomes the cutout direction of the through-hole portion 17). In addition, when the shape of the cutout portion 45 is different from the shape of the through-hole portion 17 forming the insertion port 16, the shape of the cutout portion 45 may not match the shape of the through-hole portion 17 forming the insertion port 16, even partially. For example, the shape of the cutout portion 45 may be a curved cutout (eg, C-shape), and the through portion 17 forming the insertion port 16 may be a linear cutout (eg, cross-shaped).

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

[0047] (Coating agent) In the cover 10, the coating agent 48 bonds the gas-liquid separating material 42 and the paper-based substrate 41. The coating agent 48 may not be limited to a particular area as long as it is provided on the top surface 11 of the main body 40 so as to be able to fix the gas-liquid separating material 42, but it is preferable that the coating agent 48 is provided in a limited area on the opposing surface 73 side of the top surface 11 of the main body 40 from the viewpoint of ensuring recyclability. The area where the coating agent 48 is provided is determined to be an area corresponding to the area where the gas-liquid separating material 42 is disposed. In the example of FIG. 1A to FIG. 1D, the area where the coating agent 48 is provided is determined as an annular area that is slightly inside the outer periphery of the gas-liquid separating material 42 and corresponds to the outside of the area corresponding to the through portion 17. However, this is just one example, and the area where the coating agent 48 is provided may be non-annular as long as it is formed so as to be able to bond the gas-liquid separating material 42 and the paper-based substrate 41. However, from the viewpoint of suppressing the risk of the mixed fluid 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 where the coating agent 48 is provided is annular. From the viewpoint of bonding 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. In this case, since the entire surface of the gas-liquid separating material 42 is fixed by the coating agent 48, it is likely that the cushioning property of the gas-liquid separating material 42 is reduced, and when the flow rate of the mixed fluid is high, it is likely that a part of the liquid contained in the mixed fluid passes through the gas-liquid separating material 42. From this viewpoint, it is preferable that the region where the coating agent 48 is provided is a part such as annular. In the example of FIG. 1, the cover 10 has a non-bonded portion 82 inside the region where the coating agent 48 is provided in a plan view of the cover 10 (when the Z-axis direction is the line of sight). In the non-jointed 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. Specifically, examples of coating agents include polyethylene (PE) and polyethylene terephthalate (PET). Since the coating agent has thermoplastic properties, the gas-liquid separating material 42 and the paper-based substrate 41 can be bonded via the coating agent 48 using a heat sealing method, ultrasonic bonding method, or the like. The portion where the gas-liquid separating material 42 and the paper-based substrate 41 are bonded is referred to as a separation paper bonded portion 49. From the viewpoint of reducing the use of plastic materials, it is preferable that the coating agent is made of a non-plastic resin.

[0049] (Strength of separation paper joint) In the cover 10, the gas-liquid separating 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 has penetrated into the inter-fiber gaps 47. The extent to which the coating agent 48 has penetrated into the inter-fiber gaps 47 at the separation paper joint 49 is preferably such that the gas-liquid separating material 42 and / or the coating agent 48 are destroyed (internal destruction) when the gas-liquid separating material 42 and the coating agent 48 are separated from each other at room temperature and normal pressure (25°C, 1 atm). The coating agent 48 and the paper-based substrate 41 are also preferably destroyed to a degree that the paper-based substrate 41 and / or the coating agent 48 are destroyed when the paper-based substrate 41 and the coating agent 48 are separated from each other at room temperature and normal pressure (25°C, 1 atm). 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 of the gas-liquid separating material 42, the paper-based substrate 41, the coating agent 48, etc.

[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] (Bend) The curved 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 curved 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 body 10 is attached to the container 101. In the example of FIG. 1A to FIG. 1D, the curved portion 12 has a bent structure, but as described later, the curved portion 12 is not limited to having a bent structure. In addition, 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 an 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 curved portion 12). 1A to 1D, the curved portion 12 is formed at the boundary between the top surface portion 11 and the side wall portion 13, and the top surface portion 11 and the side wall portion 13 are defined by the curved portion 12. The boundary between the top surface portion 11 and the side wall portion 13 is determined at the center of the curved portion 12. When the curved portion 12 has a curved structure as described later using Figures 8A to 8B and the like, the curved portion 12 is configured by a portion specified by the curved range, and the boundary between the top surface portion 11 and the side wall portion 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 described later.

[0052] (Side wall) 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, which will be described later, and also has an overlapping portion 20 in which adjacent small wall portions 14 partially overlap. In the overlapping portion 20, a small wall joint portion 15 that joins adjacent small wall portions 14 is formed.

[0053] (Overall shape of side wall) 1A to 1D, the overall shape of the side wall portion 13 is tapered in the vertical direction from the bent portion 12 toward the front end of the small wall portion 14 (-Z direction). The tapered shape refers to a shape in which, in a plan view of the lid 10, the cross section of the side wall portion 13 (the cross section of the side wall portion 13 that can be seen even when the side wall portion 13 is cut along a plane parallel to the XY plane) is formed at a predetermined position below the bent portion 12 on the inside of the cross section of the side wall portion 13 at a position near the bent portion 12, and 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 position of the bent portion 12. Regarding the shape of side wall portion 13, there are shapes for inner surface 13A of side wall portion 13 and shapes for outer surface 13B of 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) 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. The 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 one example.

[0055] The outer peripheral edge of the small wall portion 14, except for the base end portion 31 and the front end portion 32, forms the 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 later, but it is preferable that one side end portion 33 of the adjacent small wall portions 14 and the other side end portion 33 facing the one side end portion 33 are formed in a shape parallel to each other in the state of the blank material 50 described later. In the example of FIG. 1, the shape of the side end portion 33 is formed in a straight line extending outward (in the radial direction of the blank material 50) from the center of the blank material 50 (position CB in FIG. 7A) in a plan view of the blank material 50 described later. The small wall portion 14 is composed of individual folding margin portions 51 in the blank material 50 described later. In an example in which the blank material 50 shown in the example of FIG. 7A is shaped to form the lid body 10 of FIG. 1A, the center CB of the blank material 50 is approximately at the center CT of the lid body 10.

[0056] The small wall portion 14 is formed so as to surround the outer peripheral end 11A of the top surface portion 11. That is, the multiple small wall portions 14 are formed so as to be aligned in the circumferential direction of the top surface portion 11 along the bent portion 12. In addition, the small wall portions 14 adjacent to each other in the circumferential direction of the top surface portion 11 partially overlap each other. The overlapping structure of the adjacent small wall portions 14 may be the same for all the small wall portions 14 aligned in the circumferential direction of the top surface portion 11. For example, among the side end portions 33 of the small wall portion 14, the side end portion 33 on the -X direction side in FIG. 1B is set as the first side end portion 33A, and the side end portion 33 on the +X direction side is set as the second side end portion 33B (the first side end portion 33A and the second side end portion 33B are determined so that the direction from the first side end portion 33A toward the second side end portion 33B coincides with the clockwise direction in the circumferential direction of the top surface portion 11 when the side end portion 33 of the small wall portion 14 is viewed). 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 only 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 as the surface facing container 101 when attached to container 101, and an outer surface portion 35 as the surface opposite to inner surface portion 34, and the exposed portion of inner surface portion 34 of small wall portion 14 forms inner peripheral surface 13A of side wall portion 13. In addition, in the examples of FIGS.

[0058] The shape of the small wall portion 14 is not particularly limited, but it is preferable that at least a part of the small wall portion 14 has a shape in which the width is larger at the front edge portion 32 than at the base end portion 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 portion 31 toward the front edge portion 32. As an example of such a shape, the shape of the small wall portion 14 can be exemplified by a sector shape.

[0059] The small wall portion 14 preferably has a resin layer (preferably a thermoplastic resin layer) formed on at least one surface 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 heating process, an ultrasonic welding process, or the like when forming the lid body 10 from the blank piece 50 described later. This can be realized by using a sheet material having a resin layer formed on at least one surface as the material of the lid body 10 (as the material of the blank piece 50). Specific examples of the sheet material include those having a laminated structure of a layer formed of a paper-based material (e.g., paper) and a resin layer (e.g., coated paper).

[0060] (Overlapping part) 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 Fig. 1A to Fig. 1D, as described above, when, among 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 region of the overlapping portion 20 is not particularly limited, but preferably has a portion in which the width of the overlapping portion 20 increases from the base end portion 31 of the small wall portion 14 toward the front end edge portion 32. In the example of Fig. 1A to Fig. 1D, the region of the overlapping portion 20 is shaped such that the width WK of the overlapping portion 20 gradually increases from the base end portion 31 of the small wall portion 14 toward the front end edge portion 32. When the region WK of the overlapping portion 20 is formed in this manner, it becomes easy to form the formation region of the small wall joint portion 15 described later so as to be similar to the region of the overlapping portion 20, and it becomes easy to form a structure in which the effect of the small wall joint portion 15 is enhanced. The width of the overlapping portion 20 (width WK in Fig. 1B) refers to the length in the direction parallel to the straight line M, when a straight line M is assumed to connect the two ends 31A and 31B of the base end portion 31 of the small wall portion 14, among the lengths of the region along the surface of the overlapping portion 20.

[0062] (Small wall joint) In the overlapping portion 20, the opposing surfaces of the small wall portions 14 constituting the overlapping portion 20 are joined to each other, and this joined portion is the small wall joint portion 15. In the example of FIG. 1A to FIG. 1D, it is defined as a portion where the outer surface portion 35 of the first small wall portion 14A and the inner surface portion 34 of the second small wall portion 14B are joined. By forming the small wall joint portion 15, it is possible to restrict the adjacent small wall portions 14 from moving freely relative to each other, and the overall shape of the side wall portion 13 is easily stabilized. In particular, unlike the conventional wrinkled structure such as fine wrinkles or folds formed by the parts constituting the blank material being densely formed by shaping the blank material, the small wall joint portion 15 is a surface-joined portion, so that the shape of the side wall portion 13 is more easily stabilized. Note that this does not prohibit the formation of a conventional wrinkled structure in addition to the small wall joint portion 15.

[0063] The formation area of ​​the small wall joint 15 is not particularly limited as long as it is an area that can suppress the small wall 14 constituting the side wall 13 from freely rotating around 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 a position far from the bent portion 12 (at a position close to the lower end of the side wall 13), and further making it possible for the side wall 13 to deform relatively closer to the bent portion 12 than 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 becomes larger from the bent portion 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 is similar. In this case, the overlapping portion 20 and the small wall joint 15 can be formed almost simultaneously by subjecting the overlapping portion 20 to a heat fusion treatment (heating 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 area 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 to each other is formed as a part by fixing the small wall portions 14 by adhesion 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 thereof 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 to the front edge 32 of the small wall portion 14. An example of the formation region of such a small wall joint 15 is a roughly fan-shaped formation region (a shape in which fan shapes are partially overlapped).

[0065] [1-2 Lid blank material and manufacturing method] 1A to 1D, in the present invention, the lid 10 has a three-dimensional shape as a whole because the surface directions of the top surface 11 and the side wall 13 are different. Such a three-dimensional shape of the lid 10 can be realized, for example, by deforming (shaping) a lid blank into a shape corresponding to the shape of the lid 10 using a molding device or the like. In this specification, the lid blank may be simply referred to as a blank.

[0066] (Blank material for lid) The lid blank (blank 50) is a blank 50 corresponding 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. When the blank 50 is sheet-like, it includes a blank 50 having a through portion 17, a tab member 19, etc., provided at a corresponding position in accordance with the shape and configuration of the lid 10, as described below.

[0067] (First corresponding part and second corresponding part) 7A, the blank 50 has a first corresponding portion 52 and a second corresponding portion 53. Incidentally, 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] The blank material 50 corresponding to the lid body 10 shown in FIG. 1A may be formed of a sheet material in which a gas-liquid separating material 42 is arranged on a circular sheet material 55 as a paper-based base material 41, as shown in FIG. 7A. The blank material 50 has a plurality of cut portions 54 extending from the outer periphery of the sheet material 55 toward the inside, and in the example of FIG. 7A, the portion between adjacent cut portions 54 along the outer periphery of the sheet material 55 becomes a folding margin portion 51 that is bent when the blank material 50 is shaped. A portion formed by a combination (assembly) of the folding margin portions 51 forms a second corresponding portion 53. Note that when the folding margin portion 51 is folded in the direction of the arrow FD as shown in FIG. 7B, the folding margin portion 51 forms the small wall portion 14 (or forms a part of the small wall portion) when the blank material 50 is changed in shape to the lid body 10. FIG. 7A and the like are one example of the blank piece 50, and the blank piece 50 may be configured to be folded at a predetermined position further toward the center than the position of the innermost end of the cut portion 54, for example.

[0069] (Lid manufacturing method) The lid 10 can be manufactured by, for example, forming the blank 50 into a shape corresponding to the shape of the lid 10 using a lid forming device or the like. An example of the lid forming device is a device having a pair of male and female molds (not shown). The male and female molds are separated, the blank 50 is placed between the male and female molds, and the molds are clamped to form the shape. At this time, the blank 50 is folded at the inner end of the second corresponding portion 53 (the boundary between the first corresponding portion 52 and the second corresponding portion 53) or in the vicinity thereof, and a structure (overlap portion 20) is formed in which the adjacent folding margin portions 51 overlap each other as shown in FIG. 7D. The conditions of the width of the overlap portion 20, etc., can be determined by adjusting the shape of the mold, the control of the lid forming device, etc. By forming the blank 50, the first corresponding portion 52 becomes the top surface portion 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] 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 and female molds is a separable mold from the viewpoint of realizing mold clamping.

[0071] From the viewpoint of forming the small wall joint 15 simultaneously with shaping the blank 50, it is preferable that the lid forming device is provided with a joining mechanism for forming the small wall joint 15. Examples of the joining mechanism include a heating mechanism configured to perform a heat treatment for heating at least a part of the overlapping part 20, and an ultrasonic welding mechanism configured to perform an ultrasonic welding treatment on a part of the overlapping part 20. From the viewpoint of forming the small wall joint 15 by heat treatment, it is preferable that an adhesive or resin is placed in the part constituting the overlapping part 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 through hole formed in the top surface, and if the container contains liquid when the container 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 through hole. In particular, if the liquid contained in the lidded container is hot or carbonated, the container will be filled with gas such as steam or carbon dioxide, and these gases will spray out through the through hole in the lid. When the lidded container is moved, the liquid surface may become wavy as the liquid moves inside the container, and some of the wavy liquid may be caught in the flow of gas trying to spray out of the container, and may be lifted up together with the gas and spray out through the through hole.

[0073] Furthermore, in terms of reducing the environmental load, the use of petroleum-based materials is required for the lid body, and from the viewpoint of reducing the use of petroleum-based materials, it is required to use paper-based materials as much as possible. Also, from the viewpoint of reducing the environmental load, it is important to improve the recyclability of the lid body. Therefore, it is required that the lid body be made of a paper-based material, while preventing leakage of contents from the container with the lid body and improving recyclability.

[0074] According to the lid 10 of the present invention, by having a special configuration for separating the gas FGA and the liquid FLI from the mixed fluid FW, it is possible to prevent leakage of the contents from the container with a lid 150. For example, as shown in FIG. 2A, when the mixed fluid FW collides with the gas-liquid separating material 42 from the inside of the container 101, the gas FGA passes through the 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 44 arranged in the fiber 43A of the gas-liquid separating material 42. Then, the liquid FLI falls down again to the bottom of the container 101 due to its own weight or the like. As a result, according to the lid 10, it is possible to separate the gas FGA and the liquid FLI from the mixed fluid FW. Also, even if the momentum of the mixed fluid is strong and the liquid FLI enters the fiber gaps 47 toward the inside of the gas-liquid separating material 42, the liquid FLI collides with the fiber 43A, and the liquid droplets are broken and the momentum is reduced. Then, if a liquid repellent agent 44 is placed inside the gas-liquid separating material 42, the liquid FLI will eventually be repelled by the liquid repellent agent 44 inside the gas-liquid separating material 42, and the liquid FLI of the mixed fluid FW will again easily fall downward in the container 101 due to its own weight, etc.

[0075] In particular, according to the lid 10 of the present invention, the gas-liquid separator 42 separates the gas FGA and the liquid FLI, and the top surface 11 is made of a paper-based base material 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, so that the lid 10 of the present invention makes it easy to further improve recyclability.

[0076] 1A to 1D, the side wall 13 has a structure in which a plurality of small wall portions 14 continuous with the top surface portion 11 are partially overlapped, and the top surface portion 11 and the side wall portion 13 can be formed by shaping a sheet-like blank material 50. Furthermore, in the lid of the present invention, the small wall joint portion 15 spreads in the surface direction (circumferential direction) of the side wall portion 13, so that the risk of the side wall portion 13 spreading irreversibly outward even if a force spreading in the surface direction acts on the side wall portion 13 can be suppressed more than in conventional lids having a pleated or wrinkled structure in the side wall portion. 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 of the lid body 10 (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 stretching and compromising the airtightness of the lid-equipped container 150.

[0077] In a conventional lid having a fold or wrinkle-like structure on the side wall, the members constituting the side wall are continuous (there is no or few breaks) at the wrinkled portions. 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 portions 20. For this reason, when forming a lid of the present invention having the same cross-sectional diameter as a conventional lid having a fold or wrinkle-like structure on the side wall, if the total area of ​​the face-to-face contact area (the face-to-face contact area of ​​the portion forming the wrinkles or folds) where the members constituting the side wall of the conventional lid come into face-to-face contact with each other is ARA1, and the total area of ​​overlapping portions 20 in the lid of the present invention is 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 lid] (Variation 1) In the cover according to the first embodiment, the shape of the gas-liquid separating material 42 is not particularly limited. The gas-liquid separating material 42 may be, for example, rectangular as shown in Figs. 17A to 17C (Modification 1). This form is referred to as Modification 1 of the first embodiment. Fig. 17A is a plan view for explaining one example of Modification 1 of the first embodiment. Fig. 17B is a side view for explaining one example of Modification 1 of the first embodiment. Fig. 17C is a cross-sectional view for explaining one example of Modification 1 of the first embodiment.

[0079] (Variation 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.

[0080] (Variation 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 as described above (downward (-Z direction) in Figs. 1B, 1C, etc.) (Modification 7). The lid body 10 according to the first embodiment may be formed, for example, so that the side wall portion 13 has a thickened shape. 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 thickened). The lid body 10 according to the first embodiment may be formed, for example, so that the side wall portion 13 has a shape that is partially expanded or partially contracted in diameter. In the lid body 10 according to the first embodiment, the side wall portion 13 may have a flare shape (a shape that expands like a trumpet).

[0082] (Variation 5) In the lid body 10 according to the first embodiment, as shown in Figs. 6A to 6B, in addition to the through-hole portion 17, a drinking spout forming structure 18 for forming a drinking spout may be formed on the top surface portion 11 (Modification 5). Figs. 6A to 6B are plan views for explaining one example of the top surface portion 11 of the lid body 10 according to Modification 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 with the hinge portion 18C as an axis, the small opening 18A is exposed. This exposed small opening 18A becomes the drinking spout. When the drinking spout forming structure 18 is formed, it is preferable that a tab member 19 is attached to the small lid portion 18B as shown in Figs. 6A and 6B.

[0083] In the lid body 10 according to the fifth modified example of the first embodiment, it is preferable that the gas-liquid separating material 42 is disposed on the lower surface 11B of the top surface portion 11, avoiding the small lid portion 18B of the drinking spout forming structure 18. By disposing the gas-liquid separating material 42, avoiding the small lid portion 18B, even if the small lid portion 18B is pulled up around the hinge portion 18C as an axis as shown by the dashed line in Fig. 6B (in Fig. 6B, the small lid portion 18B is pulled up as the tab member 19 is pulled up), a state in which a piece of the fiber 43A of the gas-liquid separating material 42 is located near the small opening 18A is unlikely to occur, and even if the user places his / her mouth on the small opening 18A, the piece of the fiber 43A is unlikely to come into contact with the user's mouth, and discomfort to the user caused by the fiber 43A touching the user's mouth can be suppressed.

[0084] (Variation 6) In the case where the bent portion 12 and the side wall portion 13 are provided in the cover 10 according to the first embodiment, the bent portion 12 may be formed of the protruding portion 226 as shown in FIG. 8A to FIG. 8B. In addition, the protruding portion 225 may be formed at the end (outer end 228B) of the protruding portion 226 that is closer to the side wall portion 13 among the ends (inner end 228A, outer end 228B) or in the vicinity thereof (Modification 6). This form is referred to as Modification 6 of the first embodiment. FIG. 8A is a plan view showing an example of Modification 6 of the first embodiment. FIG. 8B is a cross-sectional view showing an embodiment of Modification 6 of the first embodiment. In the example of FIG. 8A to FIG. 8B, the gas-liquid separating material 42 is disposed so as to face a part of the region of the top surface portion 11 and a predetermined region of the top surface portion 11 including the through portion 17.

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

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

[0087] (Variation 7) In the cover 10 according to the sixth modification of the first embodiment, as shown in Figs. 9A to 9C, the gas-liquid separating material 42 may be arranged not only on the top surface portion 11 but also from the bent portion 12 to the overhanging portion 226 and the convex portion 225 (Variation 7). This form 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 state of the area EI shown by the dashed line. In the example of Figs. 9A to 9C, the gas-liquid separating material 42 is continuously arranged from a portion of the top surface portion 11 facing a predetermined area including the through portion 17 to a region on the inner side of the overhanging portion 226 and a position near the tip of the inner side of the convex portion 225 (the surface side facing the container 101). According to the lid body 10 relating to the fifth variant of the first embodiment, when the lid body 10 is used as a container with a lid 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 226, and the risk of liquid leaking from between the edge portion 103 and the inner surface 226A of the protrusion 226 can be more effectively prevented.

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

[0089] In the fiber 43A included in the paper-based ventilation sheet 43 constituting the gas-liquid separation material 42, when a plurality of fibers 43A are oriented, the orientation of the fiber 43A may be generally in one direction, or may be generally in a plurality of directions (two directions, etc.) as shown in FIG. 2B. Here, when the fiber 43A is oriented in a specific direction, it is not limited to the case where all the fibers 43A are aligned so that the longitudinal direction is a specific direction, but also includes the case where the longitudinal direction of some of the fibers 43A is deviated from the specific direction. In addition, the paper-based ventilation sheet 43 may have a difference in fiber density (roughness or density of fiber density) in terms of the fiber density at different positions in the surface direction of the paper-based ventilation sheet 43. In addition, when the paper-based ventilation sheet 43 has a difference in fiber density (roughness or density of fiber density), the paper-based ventilation sheet 43 may have an uneven surface shape such that the parts with high fiber density are convex parts and the parts with low fiber density are concave parts. In the example of FIG. 2B, the high fiber density portions are generally formed in a lattice pattern, and the high fiber density portions are surrounded by low fiber density portions.

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

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

[0092] [2 Second embodiment] [2-1 Configuration] The lid 10A according to the second embodiment has a top surface portion 11, a bent portion 12, and a side wall portion 13, as illustrated in Fig. 10A and Fig. 10B. The top surface portion 11 is provided with a through portion 17 and a gas-liquid separator 42, but these may be the same as those in the first embodiment, and therefore their description will be omitted. Fig. 10A and Fig. 10B are a perspective view and a cross-sectional view showing an example of the lid according to the second embodiment. In Fig. 10B, reference numeral 274 corresponds to a portion that contacts the edge portion 103 of the container 101 when the lid is attached to the container 101. Reference numeral 274A indicates a portion where the top surface portion 11 and the edge portion 103 contact, and reference numeral 274B indicates a portion where the side wall portion 13 and the edge portion 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 configurations of 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 (the cross-sectional inner diameter becomes smaller (reduced diameter)) downward (toward the -Z direction), but the tapered shape of the side wall 13 is a preferred example as explained in the first embodiment, and the shape of the side wall 13 is not limited to this.

[0094] The lid body 10A in the second embodiment has a top surface portion 11 and a side wall portion 13 formed from separate members, and can be specifically manufactured by further adhering the member forming the top surface portion 11 and the member forming the side wall portion 13 together.

[0095] For example, in the formation example of the lid body 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 portion 11 and a side wall forming member 223 for forming the side wall portion 13 are prepared. A joint margin 230 configured to be joinable to the side wall forming member 223 as a second portion 232 is extended from the outer end (outer edge end) of the first portion 231 of the canopy forming member 222. The joint margin 230 of the canopy forming member 222 is bonded to the upper end of the side wall forming member 223 to join the canopy forming member 222 and the side wall forming member 223, thereby forming the bent portion 12. At this time, the lid body 10 is formed. In this case, as shown in FIG. 14A and FIG. 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 as the blanks. The first blank 251 for forming the canopy forming member 222 may be a sheet material formed in a shape that matches the shape of the top surface 11 with the joint margin 230. It is preferable that the first blank 251 is provided with a through portion 17 and a gas-liquid separator 42. The second blank 252 is shaped according to the shape of the sidewall 13. For example, when the sidewall 13 has a shape that narrows or widens toward the tip, a sheet material formed in a fan shape (formed in a 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 at both ends of the second blank 252.

[0096] [2-2 Action and Effect] According to the lid body 10A of the second embodiment, as in 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 the first embodiment in that it has a top surface portion 11 and a side wall portion 13 and can be fitted into a container 101. In the third embodiment, the top surface portion 11 is provided with a through portion 17 and a gas-liquid separator 42, but these may be similar to those in the first and second embodiments, so their explanation will be omitted. Figures 11A and 11B are a perspective view and a cross-sectional view showing an example of the lid according to the third embodiment.

[0098] The cover 10B according to the third embodiment has a configuration in which a part of the side wall 13 extends above and below the top surface 11. The side wall 13 has an annular (including cylindrical) shape and has an upper wall 205 and a lower wall 206. The lower wall 206 is a part that extends below the top surface 11, and the upper wall 205 is composed of the part of the side wall 13 excluding the lower wall 206. In the example of Figs. 11A and 11B, the side wall 13 is formed so as to taper downward. Also, in the example of Figs. 11A and 11B, a through-hole 17 is formed at a predetermined position of 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 of 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 portion-forming member) Canopy portion-forming member 222 has a first portion (first portion 231 of canopy portion-forming member 222) corresponding to top surface 11, and a second portion (second portion 232 of canopy portion-forming member 222) extending from the outer peripheral end of first portion 231, with second portion 232 forming joint margin 230 shown in the second embodiment. In the example of FIG. 11A, second portion 232 of canopy portion-forming member 222 is a portion (rising portion) that rises diagonally upward or straight upward from the outer peripheral end of first portion 231 in the state of lid 10, and with second portion 232 joined to sidewall portion-forming member 223, second portion 232 forms part of sidewall 13.

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

[0102] In the example of FIG. 11A and FIG. 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 that becomes the second portion 232 of the canopy portion forming member 222, and further has a continuous portion 235 that connects the first contact wall portion 233 and the second contact wall portion 234, and the continuous portion 235 covers the upper end surface of the joint margin 230 that becomes the second portion of the canopy portion 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 portion forming member 222, and in the example of FIG. 11A and FIG. 11B, it is slightly separated from the first portion 231. However, this is just an example. The lower end of the second contact wall portion 234 may be in contact with the upper surface side of the first portion 231 of the canopy portion forming member 222.

[0103] 11A and 11B, lower wall 206 (lower portion 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. Lower wall 206 (lower portion forming portion) is preferably located, for example, below the lower surface of first portion 231 of canopy portion forming member 222 in terms of its position in the up-down direction.

[0104] (Blank) The lid 10B according to the third embodiment can be formed by processing a blank. As the blank, the blanks for forming the top-side portion forming member 222 and the side-wall portion forming member 223 (referred to as the first blank and the second blank, respectively, as described above in the second embodiment) can be used.

[0105] The first blank for forming the canopy portion-forming member 222 may be the same as the first blank 251 described above in the second embodiment, and may be a sheet material formed into a shape that further includes a joint margin 230 in accordance with the shape of the top surface 11. The canopy portion-forming member 222 is preferably formed by bending and shaping 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). In other words, the second portion 232 is preferably formed by bending the first blank upward at the peripheral position of the first portion 231 (the base end of the joint margin 230).

[0106] The second blank material for forming the side wall portion forming member 223 may be the same as the second blank material 252 described above in the second embodiment, and may be a sheet material formed in a fan shape. The end edges of the second blank material are joined to form an annular body, and the upper end portion of the annular body is folded back 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, as well as to form an upper forming portion (a structural portion corresponding to the upper wall 205), and further to form a lower forming portion (a structural portion corresponding to the lower wall 206). The side wall portion forming member 223 is formed by forming the upper forming portion and the lower forming portion. At least the first contact wall portion 233 and the second contact wall portion 234 are bonded to the joint margin 230. In the example of FIG. 11B, the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235 are bonded to the joint margin 230 to form an adhesive portion.

[0107] In addition, when manufacturing the lid body 10B, it is preferable to join the canopy forming member 222 to the annular body formed from the second blank material. That is, the lower end of the joint margin 230 (second portion 232) of the canopy forming member 222 is aligned with the boundary position (the boundary position between the upper wall 205 and the lower wall 206) of the inner peripheral surface of the annular body, and the joint margin 230 faces the inner peripheral surface of the annular body. Furthermore, as described above, the upper end side of the annular body is folded back 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 becomes the side wall forming member 223 so as to be sandwiched between the first contact wall portion 233 and the second contact wall portion 234. As a result, the side wall forming member 223 is formed and the lid body 10B is obtained.

[0108] [3-2 Action and Effect] According to the lid body 10B of the third embodiment, as in 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 the second embodiment in that it has a top surface portion 11 and a side wall portion 13 and can be fitted to a container. In the fourth embodiment, the top surface portion 11 is provided with a through portion 17 and a gas-liquid separator 42, but since they may be similar to those in the first and second embodiments, their explanations will be omitted. Figures 12A and 12B are a perspective view and a cross-sectional view showing an example of the lid according to the fourth embodiment.

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

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

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

[0113] (Sidewall forming member) Sidewall forming member 223 is formed in an annular (including cylindrical) shape, and has a portion (upper forming portion) that forms upper wall 205 and a portion (lower forming portion) that forms 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 joint margin 230 that becomes second portion 232 of 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 side of the joint margin 230 that becomes the second portion 232 of the canopy portion forming member 222, and further a lower end side continuous portion 239 that connects the lower first contact wall portion 237 and the lower second contact wall portion 238, and the lower end side continuous portion 239 covers the lower end surface of the joint margin 230 that becomes the second portion 232 of the canopy portion forming member 222. The upper end of the lower second contact wall portion 238 is located on the lower surface (opposing surface 73) side of the first portion 231 of the canopy portion forming member 222, and in the example of FIGS. 12A and 12B, it is preferable that it is separated from the 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 of Fig. 12A and Fig. 12B, the upper wall 205 (upper forming part) is a part that extends upward (diagonally upward in Fig. 12B) from the upper end of the lower first contact wall part 237 as a base end. For example, the upper wall 205 (upper forming part) is preferably located on the upper side of the upper surface of the first part 231 of the canopy part forming member 222 in terms of the vertical position. As shown in the example of Fig. 12A and Fig. 12B, the upper forming part preferably has a curl part (side wall upper end curl part 236) formed on its upper end side. In this case, it is possible to prevent the end face of the blank material (second blank material for forming the side wall part forming member 223) from being exposed at the upper end of the upper forming part, and even when a user places his / her mouth on the end face of the blank material to ingest the contents in the container 101, it is possible to prevent the user from feeling discomfort caused by the mouth coming into contact with the end face of the blank material. Furthermore, by forming the side wall upper end curled portion 236, liquid is less likely to come into contact with the portion of the side wall portion 13 that corresponds to the end face of the blank.

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

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

[0118] The second blank material for forming the side wall portion forming member 223 may be the same as the second blank material 252 described above in the second embodiment, and may be a sheet material formed in a fan shape. The edge portions of the second blank material are joined to form an annular body. The lower end portion of the annular body is then folded back inward at a position corresponding to the lower end side continuous portion 239 to form the lower first contact wall portion 237, the lower second contact wall portion 238, and the lower end side continuous portion 239, as well as the lower forming portion (lower wall 206), and further the upper forming portion (upper wall 205). The side wall portion forming member 223 is formed by forming the lower forming portion and the upper forming portion.

[0119] In addition, when manufacturing the lid body 10C, it is preferable to join the canopy forming member 222 in the state of the above-mentioned annular body formed from the second blank material. The upper end of the joint margin 230 (second part 232) of the canopy forming member 222 is aligned with the boundary position (boundary position between the upper wall 205 and the lower wall 206) of the inner peripheral surface of the annular body, and the joint margin 230 faces the inner peripheral surface of the annular body. Furthermore, as described above, the lower end side of the annular body is folded back inward at a position corresponding to the lower end side continuous part 239 of the annular body, thereby covering the joint margin 230 from the lower end side. Then, the joint margin 230 is joined (bonded) to the lower forming part (annular body forming the side wall forming member 223) so as to be sandwiched between the lower first contact wall part 237 and the lower second contact wall part 238. As a result, the side wall forming member 223 is formed and the lid body 10C is obtained.

[0120] [4-2 Action and Effect] According to the lid body 10C of the fourth embodiment, as in 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 capable of forming a contact portion 151 between the lid body 10 and the container by fitting them to the container 101 in a state of a lid-equipped container 150 described later. The lid body 10 applicable to the present invention is not limited to this, and may be one in which the contact portion 151 is formed 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) 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] The lid 10D according to the fifth embodiment has a main body 40, as shown in Figures 13A to 13C. 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 by, for example, heat sealing in the state of a lid-equipped container 150.

[0123] The lid body 10 has a joint area corresponding portion 95A. Furthermore, as shown in Fig. 13A, the lid body 10 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 portion 102. The outer area corresponding portion 95C is configured as a portion outside the lid area corresponding portion 95B.

[0124] (Part corresponding to the joint area) The joint area corresponding portion 95A is a portion of the lid 10D corresponding to the area to be joined to the container 101 along the edge 103 of the container 101. That is, the joint area corresponding portion 95A is a portion of the lid 10D corresponding to the contact area R (an area facing the edge 103 of the container 101 and joined to the container 101 in the fifth embodiment). In the lid-equipped container 150, the joint area corresponding portion 95A is a portion of the lid 10D that forms the contact portion 151 between the lid 10D and the container 101. Specifically, in a plan view of the lid 10D (in the example of FIG. 13A to FIG. 13C, the Z-axis direction (vertical direction) is the line of sight), the portion that forms the contact area R is defined as the joint area corresponding portion 95A. The joint 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 portion 103 of the container 101 is formed in a substantially annular shape, the contact region R is annular, and the joining region corresponding portion 95A is also substantially annular in a plan view of the lid body 10. The outer edge of the joining region corresponding portion 95A is determined according to the position of the outer edge of the contact region R. The outer edge of the joining region corresponding portion 95A may be located on the outer peripheral edge of the lid body 10 (in this case, the joining region corresponding portion 95A and the outer region corresponding portion 95C coincide with each other), or may be located inside the outer peripheral edge of the lid body 10 as shown in the example of FIG. 13A. When the contact region R between the lid body 10 and the container 101 is not formed continuously, the portion sandwiched between the adjacent contact regions R and facing the edge portion 103 is also included in the joining region corresponding portion 95A described later.

[0125] (Corresponding part of the lid area) 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-fitted 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 in which the portion has a portion that can be partially opened, such as the insertion port 16, as described below.

[0126] (Outer area corresponding part) As shown in the example of FIG. 13A, the portion outside the lid region corresponding portion 95B of the lid body 10 is the outer region corresponding portion 95C, which is the same portion as the joint region corresponding portion 95A or a portion including the contact region R.

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

[0128] In the main body 40 (top surface portion 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 area 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 portion 11 are fixed with a coating agent 48. The gas-liquid separating material 42, the top surface portion 11, the coating agent 48, and the through-hole portion 17 are the same as those described in the first embodiment, so detailed description will be omitted.

[0129] [5-2 Action and Effect] According to the lid body 10D of the fifth embodiment, as in 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 portion 17 and has excellent recyclability.

[0130] [6. Application Examples] (Application example 1) When the lid of the first to fourth embodiments is used, the lid can be used for a container 150 with a lid as shown in Fig. 15A and Fig. 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 forming the outer periphery of an opening 102 of a container 101 having an opening 102 formed at the upper end. In this example, an example in which the lid 10 is engaged with the edge 103 is shown. Fig. 15B is a cross-sectional view that typically shows the state of the vertical cross section along the line CC in Fig. 15A. The explanation of the container 150 with a lid will be continued 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 are in contact with each other, and the area of ​​the lid 10 that forms the contact portion 151 is the contact area R. The lid 10 can be attached to the container 101 by fitting it into the container 101. In the explanation of (Application Example 1), an example will be explained in which the lid 10 according to the first embodiment is used for the container with lid 150.

[0132] The container 101 has a container body 110 having a cylindrical side wall 104 and a bottom 107 whose diameter increases toward the top (tapering toward the bottom), 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 side wall 104). Although not shown, the opening 102 of the container 101 is formed in a circular shape. However, the container 101 shown here is an example, and the configuration of the container 101 is not limited. For example, the opening 102 of the container 101 may be formed in a rectangular shape. The container 101 may be any one as long as the opening 102 can be covered with the lid 10. However, in such a case, it is preferable that the shape of the lid 10 is made to match the shape of the container 101 (for example, rectangular).

[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 (brim portion) extending outwardly on a plane.

[0134] The object stored inside the container 101 (space 105) is not particularly limited, and examples include liquid objects, objects containing solid objects and liquid objects, objects in which gas is mixed or dissolved in 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. That is, when the contents contain a fluid such as a liquid, the mixed fluid may be blown outward from the opening of the container, causing a problem that the liquid constituting the mixed fluid leaks out from inside the container.

[0135] In the container with lid 150, a special structure for separating gas and liquid is provided, which prevents the problem of the liquid constituting the mixed fluid leaking out of 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 body 10D of the fifth embodiment is used as the lid body 10, the lid body 10 is joined to the container 101 at the region (contact region R) of the lid body 10 that forms the contact portion 151, so that the lid body 10D can be attached to the container 101. As a joining method, ultrasonic welding, heat sealing, etc. can be used. Generally, a resin layer is formed on the edge portion 103 of the container 101, and in such a case, the lid body 10D and the container 101 can be joined by a method such as ultrasonic welding or heat sealing without interposing a substance that acts as an adhesive between the lid body 10 and the container 101. However, this does not prohibit the contact portion 151 where the lid body 10D and the container 101 come into contact with each other from being formed by bonding the lid body 10D and the container 101 using a substance that acts as an adhesive (for example, starch paste, etc.).

[0137] (Application example 3) The lid 10 of the present invention may be combined with a container 101 having an opening 102 .

[0138] [7. Filter examples] There are filters using paper to separate liquid from other components in the contents of a container, such as filter paper, but such filters are used to separate liquid from solids and are generally not intended for "mixed fluid of gas and liquid" to be sprayed to the outside. The gas-liquid separator 42 used in the lid 10 of the present invention can be used as a filter for mixed fluid of gas and liquid. Such a filter can mostly separate gas from mixed fluid of gas and liquid.

[0139] As explained above, the present invention can be applied to many such aspects. It can also be applied to other aspects of stores and methods of providing packaging materials. The above has been described in detail about the lid body according to the present invention, but the above are merely examples of the lid body according to the present invention and are not limited to these. Therefore, the present invention may be modified as appropriate within the scope of the gist of the present invention. In addition, the configurations of the above-mentioned inventions may be used independently of each other, or may be applied in appropriate combination with each other.

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

[0141] In the above-mentioned example of the cover 10D according to the fifth embodiment (an 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 portion 11. As shown in the first embodiment, the top surface portion 11 preferably has a paper-based base material 41 made of a paper-based material, and it is preferable to avoid forming a coating layer on the paper-based base material 41. When the top surface portion 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 portion 11 has the fibers constituting the paper-based material exposed on the surface. As described in the above-mentioned Application Example 2, when the lid body 10D and the container 101 are bonded by utilizing various bonding methods such as a heat sealing method and an ultrasonic welding method by utilizing a resin layer generally formed on the edge portion 103 of the container 101, if the fibers constituting the paper-based material are exposed on the surface at least in the bonding area corresponding portion 95A of the top surface portion 11, the bonding between the lid body 10D and the container 101 can be realized while suppressing the influence of the decrease in the adhesiveness between the lid body 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 in the bonding area corresponding portion 95A, the bonding between the lid body 10D and the container 101 can be strengthened. And, such an effect can be realized even in the case where the gas-liquid separating material 42 is omitted from the lid body 10D. Furthermore, the lid body in the case where the gas-liquid separating material 42 is omitted from the lid body 10D can further improve recyclability, that is, such a lid body can obtain the same effect as the first embodiment in terms of recyclability. It is also possible to somewhat prevent the liquid contents from leaking out of the container with a lid by making the paper-based material that makes up the lid absorb and / or adhere to the liquid.

[0142] Therefore, as described above, the form of the lid body having a structure in which the gas-liquid separating material 42 is omitted from the lid body 10D of the fifth embodiment is 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 collectively referred to 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 Shape (Shape A1)] [8-1 Configuration] The lid 300A according to the form A1 has a structure in which the gas-liquid separating material 42 is omitted from the lid 10D of the fifth embodiment, as shown in FIG. 20A and FIG. 20B. That is, the lid 300A according to the form A1 may have the same structure as the fifth embodiment, except for the gas-liquid separating material 42 being omitted from the lid 10D. The lid 300A according to the form A1 has a main body 290. The main body 290 may have the same structure as the main body 40 in the fifth embodiment, except for the point that the gas-liquid separating material 42 is omitted. In the form A1, the main body 290 has a top surface portion 291, and the top surface portion 291 has a paper-based base material 41 similar to the top surface portion 11 described in the fifth embodiment. The lid 300A according to the form A1 is joined (adhered) to the container 101 by, for example, heat sealing or the like in the state of the container with lid 150. That is, the lid 300A according to the form A1 has 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 a resin coating layer) to a container 101 having an opening 102 formed at the upper end and an edge 103 forming the outer periphery of the opening 102, and a resin layer (resin coating layer) on the surface. The main body 290 has a joining area corresponding portion 295A corresponding to a joining area determined 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 (resin coating layer of the container 101) can be adhered to at least a part of the joining area corresponding portion 5A (the portion that exposes the surface of the paper-based substrate 41).

[0144] In the example of FIG. 2, the through-hole structure is omitted in the main body 290, but the lid 300A according to the form A1 is not limited to the case where the through-hole structure is omitted. Also, in FIG. 20A and FIG. 20B, the reference numerals 298 and 299 are described, and the reference numeral 298 indicates an exposed surface, and the reference numeral 299 indicates an opposed surface. The exposed surface 298 is defined similarly to the exposed surface 72 shown in the first to fifth embodiments, and the opposed surface 299 is defined similarly to the opposed surface 73 shown in the first to fifth embodiments. Also, in FIG. 20A and FIG. 20B, the reference numeral RN is described, and the reference numeral RN indicates a joint region. The joint region RN can be determined in the same area as the contact region R shown in the fifth embodiment. The reference numeral CT shown in FIG. 20A and FIG. 20B is the center (center position) of the lid 300A.

[0145] As described above, the main body 290 of the lid 300A according to the form A1 preferably has the paper-based substrate 41 described in the first embodiment, i.e., the paper-based substrate 41 made of a paper-based material. In the lid 300A according to the form A1, it is preferable that the paper-based substrate 41 used to form the main body 290 is avoided from forming a coating layer. It is preferable that the main body 290 is made of the paper-based substrate 41 and the coating layer is avoided. As described above, when the main body 290 is made of the paper-based substrate 41 and the coating layer is avoided, at least the bonding area corresponding portion 295A of the top surface portion 291 of the main body 290 is in a state in which the fibers constituting the paper-based material are exposed on the surface. In the example of FIG. 20A and FIG. 20B, the fibers constituting the paper-based material are exposed on 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 FIG. 20A and FIG. 20B, in addition to the joint area corresponding portion 295A, the lid area corresponding portion 295B is present in the main body 290, and the lid area corresponding portion 295B is defined similarly to the joint area corresponding portion 95A and the lid area corresponding portion 95B described in the fifth embodiment. Therefore, in the description of the form A1, the description of the joint area corresponding portion 295A and the lid area corresponding portion 295B is omitted. In addition, FIG. 20A and FIG. 20B show an outer area corresponding portion 295C. The outer area corresponding portion 295C is defined similarly to the outer area corresponding portion 95C described in the fifth embodiment. Therefore, in the description of the form A1, the description of the outer area corresponding portion 295C is 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 on the surface, a large number of fine irregularities 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 and bent shapes). For this reason, the overlapping state of the fibers varies depending on the position on the surface of the main body 290. The fine irregularities 292 are formed as a result of the formation of a relatively protruding portion 292A and a relatively depressed portion 292B due to the difference in the position on the surface of the main body 290. In other words, the irregularities 292 are formed by a combination of the portion 292A and the portion 292B. In Fig. 21A, the areas corresponding to portions 292A and 292B are shown with different hatching, and the portion roughly defining 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. Figs. 21A and 21B respectively show enlarged states of area XR1 surrounded by dashed lines in Fig. 20A and area XR2 surrounded by dashed lines in Fig. 20B, but the enlargement rates are not uniform.

[0148] [8-2 Actions and Effects] When the lid is applied to a container with a lid, a resin layer is generally formed on the inner surface side of the container body. The container body can be formed by forming a first blank material for forming a side wall into a cylindrical body, and arranging a second blank material for forming a bottom part at a predetermined position on the inner peripheral surface side of the cylindrical body. When fixing the side ends of the first blank material to fix the shape of the cylindrical body formed by overlapping two side ends of the first blank material into a cylindrical shape, a resin layer (resin coating layer) may be used. In this case, since the resin coating layer is used to fix two different places in one member, the first blank material, the need to consider the adhesiveness of different members was not recognized. When the container and the lid are formed separately, the adhesion between the container and the lid corresponds to the adhesion between different members, so that consideration of the adhesiveness is required. In the conventional lid, it has been considered to provide a resin layer on the lid and bond the container and the lid. In this case, there has been a problem that the adhesiveness is high between a specific container and the lid, but is low between another container and the lid.

[0149] In contrast, according to the lid 300A of the form A1, by utilizing a resin layer generally formed on the edge 103 of the container 101 and using various bonding methods such as a heat sealing method and an ultrasonic welding method, it is possible to more reliably form a state in which the container 101 is bonded at the bonding area corresponding portion 295A as shown in Figs. 22A and 22B. When the surface side of the bonding area corresponding portion 295A facing the container 101 is coated with a resin layer, it is necessary to consider the influence of the decrease in adhesion between the lid 300A and the container 101 due to the type of resin constituting the resin layer of the container 101, but since the fibers constituting the paper-based material are exposed to the surface in the bonding area corresponding portion 295A, it is possible to suppress the influence of the decrease in adhesion between the lid 300A and the container 101. Note that Fig. 22B also shows an enlarged state of the area XRA surrounded by a dashed line.

[0150] In the example of the lid body 300A according to the form A1 shown in Figures 20A and 20B, at least in the joint area corresponding portion 295A, as shown in Figures 21A and 21B, the fibers constituting the paper-based base material 41 are exposed on the surface, and the portion where the fibers are exposed on the surface forms an unevenness 292. In the example shown in Figures 20A and 20B, the fibers constituting the paper-based base material 41 are also exposed on the surface in the lid area corresponding portion 295B, and the portion where the fibers are exposed on the surface forms an unevenness 292. According to the lid body 300A of form A1, as shown in Figures 22A and 22B, when a resin layer (resin coat 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 coat 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 morphology (morphology A2)] [9-1. First Example of Form A2] [(1) Structure] The lid 300B according to the embodiment A2 has a lid body (body 303). The body 303 is formed so as to be bondable to the container body 410 of the container 401 having the container body 410 via an adhesive material 302. As shown in FIG. 25A and FIG. 25B, the container body 410 has an opening 402 formed at the upper end and an edge portion 403 forming the outer periphery of the opening 402. FIG. 25A and FIG. 25B are a perspective view and a cross-sectional view showing an example of a container with a lid 450 in which the lid 300B shown in FIG. 23A to FIG. 23B is bonded to the container 401. The lid 300B can be used by being bonded along the edge portion 403. In the lid 300B, the area bonded to the edge portion 103 in a plan view of the lid 300B is called a bonding area RA. FIG. 23A is a plan view showing one embodiment of the lid 300B. FIG. 23B is a cross-sectional view showing the state of the vertical section of the AA line in FIG. 23A. It is more preferable to use a container 401 having flexibility at edge 403 of opening 402. However, this does not prohibit container 401 from being a container with little or no flexibility, such as a metal container.

[0153] 23A and 23B, the bonding area RA corresponds to a region formed in a substantially 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 above-described fifth embodiment, form A1, etc.

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

[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 reliably exposing the paper fibers 306A on the surface of the main body 303, it is preferable that the main body 303 is 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 molded (processed) into a predetermined shape.

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

[0158] (Paper base material) The paper-based substrate 304 may be configured in the same manner as the paper-based substrate 41 of the first embodiment or form A1 described above, but is preferably 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 (recycled fibers, etc.). The paper-based substrate 304 may be made of paper fibers alone or may contain fibers such as non-pulp-based natural fibers, synthetic fibers, and recycled fibers, but preferably contains 50% or more by mass of paper fibers, more preferably contains 70% or more by mass, and further preferably contains 80% or more by mass, and particularly preferably contains 100% by mass of paper fibers. The paper-based substrate may be a composite material containing nonwoven fabric, wood-based materials such as wood foil, and even aluminum foil, in addition to paper fibers, but when it is a composite material, it is preferable that the composite material contains 50% or more by mass of paper fibers as a whole, and particularly preferably contains 80% or more by mass of paper fibers. The higher the paper fiber content, the easier the paper-based substrate 304 is to biodegrade, 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 and the paper-based substrate 304 contain various resins, from the viewpoint of reducing the environmental load, 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 and the paper-based substrate 304 contain various resins, it is preferable to select a biodegradable resin that causes less environmental pollution problems among the various resins. As mentioned in the description of the lid 10 according to the first embodiment above, examples of biodegradable resins include microbially produced biodegradable resins such as polyhydroxyalkanoates (PHAs) 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 others such as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product surface: Biorecover, product name: Cra Drop, etc.).

[0160] In the lid 300B, the main body 303 has a joint area corresponding portion 305A corresponding to the joint area RA defined as an area to be joined to the container 101 along the edge portion 103 of the container 101, and a lid area corresponding portion 305B configured from a portion inward from the joint area corresponding portion 305A (the side in the direction toward the central position (center CT) in FIG. 23). As shown in FIG. 23, the main body 3 may have an outer area corresponding portion 305C defined as an outer portion of the lid area corresponding portion 305B. The joint area corresponding portion 305A, the lid area corresponding portion 305B, and the outer area corresponding portion 305C can be defined as portions similar to the joint area corresponding portion 95A, the lid area corresponding portion 95B, and the outer area corresponding portion 95C of the fifth embodiment, the form A1, and the like, respectively, as described below.

[0161] (Part corresponding to the joint area) The joint 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 as described above. That is, the joint area corresponding portion 305A is a portion of the lid 300B corresponding to the joint 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 joint area corresponding portion 305A is a portion of the lid 300B that forms the joint portion 451 between the lid 300B and the container 401. Specifically, in a plan view of the lid 300B (in the example of FIG. 23, the Z-axis direction (vertical direction) is the line of sight), the portion that forms the joint area RA is determined as the joint area corresponding portion 305A. The joint 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 substantially annular shape, the bonding area RA is formed in a substantially annular shape, and the bonding area corresponding portion 305A is also formed in a substantially annular shape in a plan view of the lid 300B. The outer edge of the bonding area corresponding portion 305A is determined according to the position of the outer edge of the bonding area RA. The outer edge of the bonding area corresponding portion 305A may be located on the outer periphery of the lid 300B (in this case, the bonding area corresponding portion 305A and the outer area corresponding portion 305C coincide with each other), 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 the adjacent bonding areas RA and facing the edge 403 is also included in the bonding area corresponding portion 305A described later.

[0162] (Corresponding part of the lid area) 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 in which a portion that can be partially opened, such as insertion port 319, as described below.

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

[0164] (Reception structure) Since 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. At least a part of the uneven structure 307 of the paper-based substrate 304 has a receiving structure 308 that allows the adhesive substance 302 to enter 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 constituting 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 be formed by subjecting the surface of the paper-based substrate 304 (particularly the surface on the opposing surface 373 side) to a treatment for slightly roughening the surface (roughening treatment).

[0166] (Superimposed structure) The paper-based substrate 304 may have an overlapping structure 309 (an overlapping structure having a non-adhering portion of the fibers) defined as a structure in which the fibers 306 overlap (a structure in which at least a part of the fibers 306 overlap in a plan view of the lid 300B) so that the adhesive substance 302 can penetrate toward the exposed surface 372 side from the fibers 306 arranged on the surface of the paper-based substrate 304 in a state in which the main body 303 is bonded to the container main body 410 via the adhesive substance 302. The overlapping structure 309 is formed, for example, at an intersection of the fibers 306, 306 that cross each other with a gap therebetween as shown in Fig. 24C, or in a portion where the fibers 306, 306 that are partially in contact with each other gradually move away from each other 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 bonding region corresponding portion 305A on the opposing surface 373 side.

[0168] (Distribution of Acceptance Structure) In the facing surface 373, the receiving structure 308 is not limited to being concentrated in a part of the joint area corresponding portion 305A as shown in FIG. 29C, but may be present in almost the entire area of ​​the joint area corresponding portion 305A as shown in FIG. 29A (may be present in a dispersed manner over the entire surface area of ​​the joint area corresponding portion 305A). The receiving structure 308 may further be present in at least a part of the lid area corresponding portion 305B. The receiving structure 308 of the paper-based base material 304 may also be present in almost the entire area of ​​the lid area corresponding portion 305B as shown in FIG. 29B (may be present in a dispersed manner over the entire surface area of ​​the lid area corresponding portion 305B). In addition, in FIG. 29A to FIG. 29C, the positions corresponding to the points indicated by the symbols P1, P2, P3, P4, etc. indicate the positions of the receiving structure 308.

[0169] (Rising structure) The paper-based substrate 304 may have a raised structure 310 formed as a structure in which the fibers 306 are raised. The raised structure 310 is preferably formed so that 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 when the main body 303 is bonded to the container main body 410 via the adhesive substance 302.

[0170] In the cover 300B, it is preferable that at least a part of the raised structure 310 of the paper-based base material 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 almost the entire surface of the joint area corresponding portion 305A (or may be dispersed over the entire surface of the joint area corresponding portion 305A). The raised structures may also be present in at least a part of the lid area corresponding portion 305B. The raised structures 310 of the paper-based base material may be present in almost the entire lid area corresponding portion 305B (or may be dispersed over the entire surface of the lid area corresponding portion 305B) in addition to the joint area corresponding portion 305A.

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

[0173] Moreover, the rising structure 310 may also function as the overlapping structure 309 as a whole. For example, the example in Fig. 24B has a first fiber part 311 (fibers located more inward than a second fiber part 312 described later) composed of fibers 306 located on the exposed surface 372 side, and a second fiber part 312 (fibers arranged on the surface of the paper-based substrate 304) composed of fibers located closer to the opposing surface 373 side than the first fiber part 311 along the thickness direction of the paper-based substrate 304. The fibers (second fiber portions 312) arranged on the surface of the paper-based base material 304 rise obliquely (slightly toward the -Z direction) relative to the fibers (first fiber portions 311) located inside the second fiber portions 312 (a rising structure 310 is formed) (hanging obliquely downward in the drawing of FIG. 24B), and the first fiber portions 311 and the second fiber portions 312 are at least partially overlapped in a plan view of the main body 303 (an overlapping structure 309 is formed). Therefore, the structure formed by the first fiber portions 311 and the second fiber portions 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 joined 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 in which the gap 314 is formed is defined as an overlap area (indicated by the symbol OVL in Figures 28A and 28B) in a plan view of the lid body 300B (plan view of the main body 303), the first fiber part 311 and the second fiber part 312 may have 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 part 312). Furthermore, as shown in FIG. 28A, the first fiber portion 311 located in the overlapping area OVL may include a plurality of fiber portions that form a gap 314 together with the second fiber portion 312 (in FIG. 28A, the first fiber portion 311 includes the 1-1 fiber portion 311A, the 1-2 fiber portion 311B, and the 1-3 fiber portion 311C).

[0176] (adhesive material) The adhesive substance 302 is a substance capable of bonding 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 more preferably a resin layer 420 (resin coat layer) formed in advance 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, and when the adhesive substance 302 is a resin layer 420 (resin coat layer) formed in advance on the container main body, the resin layer 420 can bond the lid body 300B and the container 401 when the lid body 300B and the container 401 are bonded by a heat seal method. That is, it is possible to make the resin layer 420 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 of the paper-based substrate 304 varies among surfaces, 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 for the main body 303, the adhesive substance 302 can increase the contact area between the adhesive substance 302 and the fibers 306 arranged on the surface of the paper-based substrate 304 in a state in which 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 members such as containers such as cups and lids have been generally made of plastic from the viewpoints of cost and moldability, as shown in the patent document JP 2021-84646 A. The large environmental burden on plastics has been a problem. In particular, it has been recognized that ordinary synthetic plastics such as petroleum-based synthetic resins have the problem of remaining in nature for a long period of time after disposal without naturally decomposing. In response to this problem, the use of biodegradable plastics has been considered even when using plastic as a material for packaging members. However, although biodegradable plastics have natural decomposition properties compared to ordinary synthetic plastics, there is a strong demand for cost improvements. In view of these points, the use of paper-based materials as materials (non-plastic materials) that have less environmental burden than plastics for packaging members has been considered. As a method for obtaining packaging members using paper-based materials, for example, a method of obtaining blank material based on a paper-based substrate and obtaining packaging members by processing the blank material can be mentioned.

[0179] In the case where the packaging member 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 base material, it is also possible to form the lid body from a sheet having a resin layer formed on both sides to improve water resistance. However, since a resin coat layer is usually formed on the surface of the container as a resin layer for waterproofing the container, depending on the quality of the resin material constituting the resin layer, the adhesiveness with the resin constituting the resin coat layer may be impaired, and it may become difficult to bond the container and the lid body by the sealing method. Therefore, there is room for improvement in terms of making it possible to bond the container and the lid body by the heat sealing method even if the types of resins constituting the resin coat layer formed on the surface of the container are diversified. 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 the sealing method even if the types of resins constituting the resin layer (resin coat layer) formed on the surface of the container are diversified.

[0180] Such conventional techniques and requests for improvement are addressed for all of the lids of form A. Furthermore, with the lids of form A (for example, the above-mentioned lids of form A1 and lids of form A2), it becomes possible to bond the container and the lid by a sealing method even if the types of resins constituting the resin layer (resin coat layer) formed on the surface of the container are diverse.

[0181] According to the lid 300B of the form A2, the main body 303 of the lid 300B is made of a paper-based substrate 304 and further has a superimposed structure 9. Therefore, when a heat sealing method is applied to attach the lid 300B to the container 401, 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 side from the fiber 306 arranged on the surface of the paper-based substrate 304, and can be bonded to the fiber (e.g., the second fiber portion 312) exposed in the superimposed structure 309, and the adhesive state between the resin layer 420 and the lid 300B can be further improved. That is, a lid using a paper-based substrate having heat sealability as a non-plastic material can be obtained. Furthermore, as described in the application example described later, a container with a lid using a lid using a paper-based substrate having heat sealability as a non-plastic material, or a combination of a lid and a container can be obtained.

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

[0183] The lid 300B according to the first embodiment may have an insertion port 319 formed therein, as shown in Figs. 33A and 33B. An example of the lid configured in this manner is referred to as Modification 1 of the first embodiment. Figs. 33A and 33B are a plan view and a cross-sectional view, respectively, that show an example of the lid 300B according to Modification 1 of the first embodiment. Fig. 33B is a view that shows a schematic vertical cross section taken along line CC in Fig. 33A.

[0184] (Socket) The insertion port 319 is a structural part that allows various members to be inserted from the outside into the container 401 when the lid 300B is used as the lid-equipped container 450, and examples of members that can be inserted include a straw. The insertion port 319 is formed at least in the lid region corresponding portion 305B, and in the example of Figs. 33A and 33B, it is formed by a through-hole. The through-hole has a structure (a structure in which the main body 303 is cut in the vertical direction (thickness direction, Z-axis direction) from one surface (exposed surface 372) to the other surface (opposing surface 373), and is a so-called cut portion 318. The 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] (Variation 2) In the cover 300B according to the first embodiment, a water-repellent treatment may be applied to a specified area (Modification 2).

[0186] (Water repellent treatment) The water-repellent treatment applicable to the second modified example of the first embodiment is not particularly limited, and may be, for example, a method of immersing the paper-based substrate 304 in a treatment liquid, and then removing the immersed paper-based substrate 304 and drying it. Another example of the water-repellent treatment is a method of applying a treatment liquid to the surface of the paper-based 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, for example, a liquid containing a water repellent agent, such as a fluorine-based water repellent agent or wax.

[0188] [9-2 Second Example of Form A2] [(1) Structure] As shown in Fig. 27C, the lid 300B according to the second embodiment has the same configuration as the first embodiment, except that the second fiber portion 312 forming the rising structure 310 of the paper-based base material 304 is bent toward the first fiber portion 311 to form the overlapping structure 309 when the body 303 is joined to the container 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 part) Before the main body 303 is bonded to the container body 410 via the adhesive substance 302, the second fiber portion 312 has a portion that rises in a direction away from the first fiber portion 311 (slightly in the -Z direction in FIG. 27A) (a portion that hangs 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 portion 312 approaches the first fiber portion 311 as a whole as shown in FIG. 27C, but a gap 314 remains between the first fiber portion 311 and the second fiber portion 312. When the main body 303 is bonded to the container body 410 via the adhesive substance 302, the first fiber portion 311 and the second fiber portion 312 form a superimposed structure 309. With regard to the size of the gap 314 formed between the first fiber part 311 and the second fiber part 312, the size is maintained large enough to allow the adhesive substance 302 to penetrate into the gap 314, both before and after the main body 303 is joined to the container body 410 via the adhesive substance 302.

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

[0191] [9-3 Third Example of Form A2] [(1) Structure] As shown in Figures 30A and 30B, the cover 300B according to the third embodiment has the same configuration as the first embodiment except that 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 base material 304. Figures 30A and 30B are enlarged cross-sectional views for explaining an example of the third embodiment.

[0192] (Space part) The space 315 has an opening that can receive resin (such as the adhesive substance 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 in the plane direction of the paper, the space 315 is a closed space by the first fiber portion 311 and the second fiber portion 312. In the third embodiment, the size of the space 315 is such that the adhesive substance 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 substance 302.

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

[0194] [9-4 Fourth Example of Form A2] [(1) Structure] As shown in Fig. 31A and Fig. 31B, the cover 300B according to the fourth embodiment has the same configuration as the first embodiment except that the first fiber portion 311 and the second fiber portion 312 are connected and a branched portion 316 is formed between the first fiber portion 311 and the second fiber portion 312. Fig. 31A and Fig. 31B are enlarged cross-sectional views for explaining one example of the fourth embodiment.

[0195] (Branch) The branched portion 316 has an opening that can receive resin (such as 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 opened, and the other end of the gap 314 is 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 is large enough that the adhesive material 302 can enter into 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, similar to the overlapping structure 309.

[0196] [(2) Actions and Effects] According to the cover of 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 Fig. 32A and Fig. 32B, the cover 300B according to the fifth embodiment has the same configuration as the first embodiment except that the third fiber part 313 is interposed between the first fiber part 311 and the second fiber part 312 forming the overlapping structure 309 of the paper-based base material 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 the adhesive substance 302 can enter toward the exposed surface 372 side (i.e., into the first gap 314A and the second gap 314B) beyond the fibers 306 arranged on the surface of the paper-based base material 304 when the main body 303 is joined to the container main body 410 via the adhesive substance 302.

[0198] [(2) Actions 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 according to the present invention, the configurations shown in the first to fifth embodiments may be appropriately combined (may coexist). That is, in the lid according to the present invention, for example, the configuration of the first and second fiber parts shown in the first embodiment may coexist with the configuration of the first and second fiber parts shown in the second embodiment.

[0200] [9-6 Application example of the lid of type A2] The lid 300B described above can be used for a container with a lid 450 as shown in Fig. 25A and Fig. 25B. Fig. 25A is a perspective view showing an embodiment in which the lid 300B is joined to an edge 403 forming the outer periphery of an opening 402 of a container 401 having an opening 402 formed at the upper end. Fig. 25B is a cross-sectional view showing a schematic state of the vertical cross section of Fig. 25A. The explanation of the container with a lid 450 will be continued with reference to Figs. 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 joint area RA. The method of joining the lid 300B and the container 401 is not particularly limited, and any suitable joining method such as heat fusion (heat sealing) can be used. In the following, an example will be described in which the lid 300B according to the first embodiment is used for the container with lid 450.

[0202] The container 401 has a container body 410 having a cylindrical side wall 404 and a bottom 407 with a diameter that increases toward the top (tapering toward the bottom), forming a space 405 inside, and an opening 402 that opens at the upper end of the container body 410 (the upper end of the side wall 404). Although not shown, the opening 402 of the container 401 is formed in a circular shape. However, the container 401 shown here is an example, and the configuration of the container 401 is not limited. For example, the opening 402 of the container 401 may be formed in a rectangular shape. The container 401 may be any container as long as the opening 402 can be covered with the lid 300B. In addition, the object stored inside the container 401 (space 405) is not particularly limited, and examples thereof include liquid objects, or a combination of liquid objects and solid objects.

[0203] 25A and other drawings, the edge 403 of the opening 402 has a flange portion. 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) extending outwardly on a plane.

[0204] In the container 401, the container body 410 preferably has a resin layer 420 formed at least on the surface of the edge 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 edge 403. In this case, the resin layer 420 is preferably a resin that can function as the adhesive substance 302. When configured in this way, the resin layer 420 can be made to function as the adhesive substance 302. That is, it is possible to adhere the lid to the container 401 by heat sealing or the like without applying a separately prepared adhesive or the like on 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 at least on the surface of the edge 403, and the resin layer 420 may be omitted on the inner circumferential surface 406 of the container body 410. The container body 410 may also be formed by processing a sheet material having 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 the form A2 will be further described with reference to an example. EXAMPLES

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

[0208] The joint between the edge and the lid of the resulting container with lid was observed under an electron microscope (magnification: 100x). The results are shown in Figure 34. In Figure 34, symbol A1 indicates the container body of the container, and symbol B1 indicates the body of the lid. Symbol C1 indicates a resin layer, and symbol C2 indicates a resin constituting the resin layer. Symbols B2 and B3 indicate a first fiber part and a second fiber part, 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 part B2 and second fiber part B3) constituting the lid, and that the resin layer C1 was functioning as an adhesive substance.

[0209] As described above, the lid body according to the present invention can be applied to lid bodies of many aspects (embodiments 1 to 5 and form A). It can also be applied to lid bodies of aspects other than those described above (lid body 10, lid body 300A, lid body 300B, etc.). The lid body according to the present invention has been described in detail above, but the above are merely examples of the lid body according to the present invention and are not limited to these. Therefore, it may be appropriately changed within the scope of the gist of the present invention. In addition, the configuration of the lid body described above may be used independently of the configuration of the lid body of each example, or the configuration of the lid body of each example may be applied in appropriate combination. 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 configurations shown in the following [E1] to [E11]. [E1] A device that is configured to be attached to a container having an opening and an edge portion that forms the opening, and that has a top surface portion that covers the opening when attached to the container, The top surface portion includes a paper-based base material made of a paper-based material, a through-hole that penetrates the paper-based base material, a gas-liquid separation material that can separate the gas of the gas phase and at least a part of the liquid of the liquid phase from a mixed fluid having a gas phase and a liquid phase, and a coating agent having thermoplasticity; The gas-liquid separating material has a paper-based breathable sheet containing long fibers and having air permeability, and a liquid repellent material 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 arranged to cover at least a part of the through-hole in a plan view of the paper-based substrate. It is located in The coating agent bonds the gas-liquid separating material and the paper-based substrate. Lid body. [E2] The lid according to [E1] above, wherein the liquid repellent is a water repellent. [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 body 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 described in any one of [E1] to [E6] above, wherein the gas-liquid separation 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 lid body according to any one of [E1] to [E8] above; the container having an opening formed at an upper end and a rim forming an outer periphery of the opening; The lid is joined to the container. Container with lid. [E10] A lid body according to any one of [E1] to [E8] above; the container having an opening formed at an upper end and a rim forming an outer periphery of the opening; A combination of a lid and a container.

[0211] Based on the above description of this specification, the present invention contemplates the following gas-liquid separating materials [F1] to [F17]. [F1] A gas-liquid separation material comprising a paper-based base material made of a paper-based material, a through-hole that penetrates the paper-based material, a gas-liquid separation 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. [F2] The gas-liquid separation material according to the above [F1], wherein the liquid repellent is a water repellent. [F3] The gas-liquid separating material according to [F1] or [F2] above, wherein the paper-based breathable sheet is a nonwoven fabric. [F4] The gas-liquid separation material according to any one of [F1] to [F3] above, wherein the long fibers are paper fibers. [F5] The gas-liquid separating material according to any one of the above [F1] to [F4], wherein 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 separation material according to any one of the above [F1] to [F6], which contains the long fibers as a main component.

[0212] 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] The container has a container body having an opening formed at an upper end and a rim portion forming an outer periphery of the opening, and the container body is formed so as to be bondable to the container body via an adhesive substance, and the container body has a paper-based base material having a plurality of paper fibers as fibers, The main body has a joining area corresponding portion corresponding 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 configured as a portion on the inside from the joining area corresponding portion, Assuming that the main body and the container main body are joined via the adhesive material, the surface of the main body that faces the container is defined as an opposed surface, and the surface opposite to the opposed surface is defined as an exposed surface, the paper-based substrate has a layered structure in which the paper fibers are layered such that, in a state in which the main body is bonded to the container main body via the adhesive substance, the adhesive substance can penetrate toward the exposed surface side beyond the paper fibers arranged on the surface of the paper-based substrate, At least a part of the overlapping structure of the paper-based base material is exposed on at least a part of the surface of the bonding area corresponding portion on the opposing surface side. Lid body. The container has a container body having an opening formed at an upper end and a rim portion forming an outer periphery of the opening, and the container body is formed so as to be bondable to the container body via an adhesive substance, and the container body has a paper-based base material having a plurality of paper fibers as fibers, The main body has a joining area corresponding portion corresponding 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 configured as a portion on the inside from the joining area corresponding portion, Assuming that the main body and the container main body are joined via the adhesive material, the surface of the main body that faces the container is defined as an opposed surface, and the surface opposite to the opposed surface is defined as an exposed surface, the paper-based substrate has a layered structure in which the paper fibers are layered such that, in a state in which the main body is bonded to the container main body via the adhesive substance, the adhesive substance can penetrate toward the exposed surface side beyond the paper fibers arranged on the surface of the paper-based substrate, At least a part of the overlapping structure of the paper-based base material is exposed on at least a part of the surface of the bonding area corresponding portion on the opposing surface side. Lid body. [G2] The overlapping structure of the paper-based substrate has a first fiber part composed of the fibers located on the exposed surface side, a second fiber part composed of the fibers located on the inner side along the thickness direction of the paper-based substrate than the first fiber part, and a space part formed between the first fiber part and the second fiber part, When the main body is joined to the container main body via the adhesive substance, the adhesive substance enters at least a part of the space. The lid body described in [G1] above. [G3] The overlapping structure of the paper-based substrate has a first fiber part composed of the fibers located on the exposed surface side, and a second fiber part composed of the fibers located on the opposing surface side along the thickness direction of the paper-based substrate relative to the first fiber part, The first fiber portion and the second fiber portion are connected to each other, A branched portion is formed by the first fiber portion and the second fiber portion. The lid body described in [G1] or [G2] above. [G4] A lid body according to any one of [G1] to [G3] above, The container includes a container body having the opening formed at an upper end thereof, The lid body is joined to the container via the adhesive material. Container with lid. [G5] The container body has a resin layer formed on at least the surface of the edge portion, The adhesive substance is a resin constituting the resin layer. A container with a lid described in [G4] above. [G6] A lid body according to any one of [G1] to [G3] above, The container includes a container body having the opening formed at an upper end thereof, The container body has a resin layer formed on at least the surface of the edge portion, The resin layer is a resin that can function as the adhesive substance. A combination of a lid and a container. [G7] A main body having a paper-based substrate having a plurality of paper fibers as fibers, The container has an opening at its upper end and an edge that defines the outer periphery of the opening, and is formed so as to be bondable to a container having a resin coating layer on its surface; The main body has a joining area corresponding portion corresponding to a joining area defined as an area to be joined to the container along the edge of the container, has a portion exposing the surface of the paper-based base material, and is configured so that the resin coat layer can be adhered to at least a part of the joining area corresponding portion. Lid body. [Explanation of symbols]

[0213] 10: Lid 10A: Lid body 10B: Lid body 10C: Lid body 10D: Lid body 11:Top section 11A: Outer edge 11B: Bottom surface 12: Bend 13: Side wall 13A: Inner surface 13B: Outer surface 14: Small wall part 14A: First small wall portion 14B: Second small wall 15: Small wall joint 16: Socket 17: Penetration 18: Mouth formation structure 18A: Small opening 18B: Small lid part 18C: Hinge part 18D: Base part 19: Tab member 20 : part 26: Overhang 31: Proximal end 31A: End 31B: End 32: Front edge 33: Side edge 33A: First side end 33B: Second side end 34: Inner surface 35: External part 40: Main body 41:Paper base material 42: Gas-liquid separation material 43: Paper-based breathable sheet 43A: Fiber 44: Liquid repellent 45: Cutout 46: Half cut section 47: Fiber gaps 48: Coating agent 49: Separation paper joint 50: Blank material 51: Folding margin 52: First corresponding part 53: Second corresponding part 54: Notch 55: Sheet material 72: Exposed surface 73: Opposite surface 74: Peripheral edge 80: Gas-liquid separation material 82: Non-joint part 83: Gap 95A: Joint area corresponding part 95B: Lid area corresponding part 95C: Outer area corresponding part 101: Container 102: Opening 103: Edge 104: Side wall 105: Spatial part 107: Bottom 108: Curl section 110: Container body 111: Outer circumference 150: Container with lid 151: Contact part 201: Lid 202:Top section 203: Side wall 205: Upper wall 206: Lower wall 222: Canopy forming member 223: Side wall forming member 224: Recess 225: Convex 226: Overhang 226A: Inner surface 227: Immersion Section 228A :Inner end 228B: Outer end 230: Joining allowance 231: First part 232: Second part 233: First contact wall part 234: Second contact wall part 235:Continuous section 236: Side wall upper end curled part 237: Lower first contact wall 238: Lower second contact wall 239: Lower end continuous section 251: First blank 252: Second blank 253 :Edge 290: Main unit 291:Top section 292: Unevenness 292A: Part 292B :Partial 295A: Joint area corresponding part 295B: Lid area corresponding part 295C: Outer area corresponding part 298 :Exposed surface 299: Opposite surface 300A: Lid body 300B: Lid body 302: Adhesive substance 303: Main body 304:Paper base material 305A: Joint area corresponding part 305B: Lid area corresponding part 305C: Outer area corresponding part 306: Fiber 306A: Paper fiber 307: Uneven structure 308: Receiving structure 309: Superimposed structure 310: Rising structure 311: First fiber section 311A: Fiber section 311B: Textile section 311C: Fiber section 312: Second fiber section 312A: Fiber section 312B: Textile section 312C: Fiber section 313: Third fiber section 314: Gap 314A: First gap 314B: Second gap 315: Spatial part 316 : Department 316A: Connection part 318: Notch 319: Socket 372 :Exposed surface 373: Opposite surface 401: Container 402: Opening 403: Edge 404: Side wall 405: Spatial part 406: Inner surface 407: Bottom 408: Curl section 410: Container body 420: Resin layer 421: Fiber 450: Container with lid 451: Joint B2: First fiber section B3: Second fiber section B4: Gap BC: predetermined part C1: Resin layer CB: Center CT: Center DR: Arrow EI: area EI: area FD: Arrow FGA: Gas FLI:Liquid FR: Predetermined part FW:Mixed fluid OVL: Overlap area R: Contact area RA: Junction area RN: Junction area Rz: Maximum height WK: area XA :Area XR1 :Area XR2 :Area XRA: area XS1:Area XS2: area XS3: Area XS4: area

Claims

1. The device is configured to be attached to a container having an opening and an edge portion that forms the opening, and has a top surface portion that covers the opening when attached to the container, The top surface portion includes a paper-based base material made of a paper-based material, a through-hole that penetrates the paper-based base material, a gas-liquid separation material that can separate the gas of the gas phase and at least a part of the liquid of the liquid phase from a mixed fluid having a gas phase and a liquid phase, and a coating agent having thermoplasticity; The gas-liquid separating material has a paper-based breathable sheet that contains long fibers and has air permeability, and 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 separation material is disposed so as to cover at least a portion of the through-hole in a plan view of the paper-based substrate, The coating agent bonds the gas-liquid separating material and the paper-based substrate. Lid body.

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 agent 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. The lid according to claim 1 ; the container having an opening formed at an upper end and a rim forming an outer periphery of the opening; The lid is joined to the container. Container with lid.

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

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