Lid, container with lid, combination of lid and container

Abstract

SOLUTION: A paper-based raw material is provided with a surface adhesion part as a part to which a non-synthetic resin-based hydrophobic organic compound is attached on at least one surface of a 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 Art

[0002] Packaging members such as containers like cups and lids have hitherto been widely used in plastic materials from the viewpoints of cost, moldability, etc., as shown in Patent Document 1. Regarding plastics, the magnitude of the environmental load has been a problem. In particular, ordinary synthetic plastics such as petroleum-based synthetic resins have been recognized to have the problem of remaining in nature for a long time without being naturally decomposed after disposal. In response to this problem, even when using plastic as a material for packaging members, the use of biodegradable plastics has been considered. However, although biodegradable plastics have natural degradability when compared with ordinary synthetic plastics, there is a strong demand for improvement in terms of cost. In view of these points, it has been considered to use paper-based materials as materials for packaging members that have a lower environmental load than plastics (non-plastic-based materials). As a method of obtaining a packaging member using a paper-based material, for example, there is a method of obtaining a blank material based on a paper-based material and obtaining a packaging member by processing the blank material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the packaging member is a lid and the lid is obtained by processing a blank material formed from a sheet (paper sheet) as a paper-based material, it is conceivable to form the lid with a sheet having resin layers formed on both sides in order to improve water resistance. However, since a resin coating layer is usually formed on the surface of the container for waterproofing the container, depending on the material of the resin material constituting the resin layer, the adhesiveness with the resin constituting the resin coating layer may be impaired, and there may be a risk that it becomes difficult to adhere the container and the lid by a sealing method. Therefore, there is room for improvement in terms of enabling the container and the lid to be adhered by a heat sealing method even when the types of resins constituting the resin coating layer formed on the surface of the container are diversified.

[0005] One of the objects of the present invention is a paper-based material as a non-plastic material which is used to have heat sealability with respect to a container having a resin coating layer lid, container with lid, combination of lid and container and to provide.

Means for Solving the Problems

[0006] The present invention has the gist of the invention according to the following (1) to ( 9 ).

[0007] (1) having a plurality of fibers It is formed from a paper-based material that exposes the surface of the base material on at least one surface of the paper-based base material, The surface has a portion formed so that the fibers are exposed, is formed so as to be joinable to a container having an opening formed at the upper end and an edge portion forming the outer periphery of the opening and having a resin coating layer on the surface, the surface of the base material among the paper-based materials at least a part of the portion formed so that the fibers are exposed A lid configured to be able to join with the resin coating layer. (2) In the paper-based material, a surface attachment portion as a portion to which a non-synthetic resin-based hydrophobic organic compound is attached is provided on at least one surface of the base material, The lid according to (1) above. (3) The lid according to (2) above, wherein the hydrophobic organic compound is a biodegradable organic compound. (4) The lid according to (2) or (3) above, wherein an inner adhesion part as a part to which the hydrophobic organic compound is adhered is formed from the surface of the base material to a part inside the base material. (5) The surface adhesion part forms a layer. The above (2) lid. (6) An inner adhesion part as a part to which the hydrophobic organic compound is adhered is formed from the surface of the base material to a part inside the base material, and the inner adhesion part and the surface adhesion part are continuous. The above (2) lid. (7) The non-synthetic resin-based hydrophobic organic compound is waxes. The above (2) lid. (8) An inner adhesion part as a part to which the hydrophobic organic compound is adhered is formed from the surface of the base material to a part inside the base material, The lid according to the above (3). (9) The surface adhesion part forms a layer, The lid according to the above (3). (10) An inner adhesion part as a part to which the hydrophobic organic compound is adhered is formed from the surface of the base material to a part inside the base material, The inner adhesion part and the surface adhesion part are continuous, The lid according to the above (3). (11) The non-synthetic resin-based hydrophobic organic compound is waxes, The lid according to the above (3). (12) Any one of the above (1) to (11) The lid according to, and a container having an opening formed at an upper end and an edge portion forming an outer periphery of the opening, wherein the container has a resin coating layer on a surface, the lid is joined to the container, and the resin coating layer is joined to a portion of the paper-based material where the surface of the base material is exposed. Container with lid. (13) Any one of the above (1) to (11) The lid according to, and a container having an opening formed at an upper end and an edge portion forming an outer periphery of the opening and having a resin coating layer on a surface. The resin coating layer is formed so as to be capable of joining to a portion of the paper-based material where the surface of the base material is exposed. A combination of a lid and a container.

Advantages of the Invention

[0008] According to the present invention, a paper-based material as a non-plastic material which is used to have heat sealability with respect to a container having a resin coating layer A lid, a container with a lid, a combination of a lid and a container and is provided.

Brief Description of the Drawings

[0009]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, the paper-based material according to the present invention will be described in detail. In particular, the description will continue by taking as an example the case where the paper-based material is a sheet. In addition, the lid using the paper-based material according to the present invention will be described in detail with reference to the drawings. Note that the lid will be described by taking as an example a lid used for a container (cup) for containing various beverages such as a coffee cup, but is not limited to the lid for a container for containing beverages, and can also be applied as a lid for a container for containing foodstuffs other than beverages. Further, the lid according to the present invention can also be applied to containers that can accommodate various articles other than food and drink, such as parts such as bolts and nuts, and articles other than those described above. Furthermore, although the lid according to the present invention will be described below using an example in which the shape in plan view is circular, the shape of the lid is not limited to a circular shape in plan view, and can also be applied to various shapes other than circular shapes, such as elliptical shapes, rectangular shapes, polygonal shapes such as triangular shapes, chamfered rectangular shapes, chamfered polygonal shapes, etc.

[0011] Hereinafter, the paper-based material related to the present invention, the manufacturing method of the paper-based material, the lid using the paper-based material, and application examples of the lid will be sequentially described with reference to the drawings. In this specification and the drawings, for components having substantially the same functional configuration, the same reference numerals are given to omit redundant description.

[0012] The following description is a preferred specific example of the present invention, and the content of the present invention is not limited to these embodiments and the like. Further, in the following description, for convenience of explanation, directions such as front and rear, left and right, up and down, and the direction of the horizontal plane are shown, but the content of the present invention is not limited to these directions. In the examples of FIGS. 1 to 24, the Z-axis direction is the up and down direction (the upper side is the +Z direction, and the lower side is the -Z direction), the X-axis direction is the front and rear direction (the rear side is the +X direction, and the front side is the -X direction), and the directions along the X-axis and Y-axis that are orthogonal to each other and defined on a plane with the Z-axis direction as the normal are the X-axis direction and the Y-axis direction. Further, it is assumed that the XY plane, which is a plane attached by the X-axis and the Y-axis, is the horizontal plane, and the explanation will be made based on these. The relative size ratios such as the sizes shown in each of FIGS. 1 to 24 are descriptions for convenience, and unless otherwise specifically limited, they do not limit the actual size ratios.

[0013] [1 Paper-based material] The paper-based material according to the present invention may be configured as shown in FIGS. 1A and 1B. The example of the paper-based material shown in the examples of FIGS. 1A and 1B is referred to as the first example. FIG. 1A is a cross-sectional view showing an embodiment of the paper-based material of the first example. FIG. 1B is an enlarged cross-sectional view schematically showing an example of the enlarged state of the region XS1 in FIG. 1A.

[0014] [1-1 First example] [1-1-1 Configuration] The paper-based material 10 of the first example has, as shown in FIGS. 1A and 1B, a base material 11 and a surface adhesion part 13 provided on the surface 11A of the base material 11.

[0015] (Base material) The base material 11 preferably uses a fiber sheet 12 made of a paper-based material.

[0016] (Fiber sheet including paper-based material) Examples of the fiber sheet 12 containing a paper-based material include so-called paper obtained by performing a process of forming a slurry of a fiber raw material (pulp-based fiber raw material) on a wire mesh and drying or press-drying it (paper-making process) to form a sheet, and so-called air-laid sheets obtained by fiberizing an open fiber raw material such as pulverized pulp obtained by pulverizing a raw material sheet made of pulp-based fibers or the like with an air stream and fixing the fibers of the fiberized body to each other with a binder, plant fibers, and so-called papers manufactured by adhering other fibers. The fiber sheet 12 containing a paper-based material includes those having a laminated structure in which a plurality of the above-mentioned papers are laminated. The fiber sheet 12 may include, in addition to the paper-based material, a sheet material having fibers other than pulp, such as chemical fibers, fibers imparted with functions such as water resistance, metal fibers, and glass fibers. However, it is preferable that the fiber sheet mainly consists of paper-based fibers. The main component means that the mass ratio of the target component to the total mass is 50% by mass or more.

[0017] The fiber sheet 12 may be composed only of the fibers 12A (aggregate structure of the fibers 12A (such as an entangled structure of the fibers)), may have a structure in which a plurality of the fibers 12A are crosslinked with a crosslinking agent or the like, and may contain additives other than the resin material described later. In the fiber sheet 12, when a plurality of the fibers 12A are crosslinked with each other by a crosslinking agent, the shape of the fiber sheet 12 is stabilized, and it becomes difficult to form a defibrated state.

[0018] (Fiber) The fibers 12A constituting the fiber sheet 12 may be composed of one unit fiber or may have a structure in which a plurality of unit fibers are entangled, and any fiber having such a structure may be included in the fiber sheet 12. It is preferable that the fiber sheet 12 is formed in a state where a plurality of fibers having such a structure are further entangled.

[0019] (Paper-based material) As the paper-based material, in addition to those composed only of pulp, those containing fibers such as non-pulp natural fibers, synthetic fibers, and recycled fibers may also be used. However, it is preferably contain 50% by mass or more of pulp, more preferably 70% by mass or more, still more preferably 80% by mass or more, and particularly preferably those composed of 100% by mass of pulp. As the paper-based material, composite materials with materials such as films or non-woven fabrics of synthetic resins or natural resins, wood-based materials such as wood foils, and further materials such as aluminum foils can also be used. In the case of a composite material, it is preferably contain 50% by mass or more of pulp in the whole composite material, and particularly preferably those containing 80% by mass or more of pulp. The higher the pulp content, the more preferable it is because the paper-based material is more easily biodegradable.

[0020] (Surface adhesion part) In the paper-based material 10, a surface adhesion part 13 is provided on the surface 11A of the base material 11.

[0021] The surface adhesion part 13 is defined as a part of a non-synthetic resin-based hydrophobic organic compound adhered to the surface 11A of the base material 11. In the example of Fig. 1B, the surface adhesion part 13 has a part of a hydrophobic organic compound adhered to at least a part of the fibers 12A constituting the fiber sheet 12 forming the base material 11. In the example of Fig. 1B, for the sake of convenience of explanation, a part of the fibers 12A forming the fiber sheet 12 is schematically described, and the description of the other fibers is omitted. This is common to Fig. 2B, Fig. 3B, Fig. 4B, Fig. 5B, and Fig. 6B. Also, for the sake of convenience of explanation, the description of the fibers 12A is omitted in the drawings showing the longitudinal section of the fiber sheet 12 (the section with the thickness direction of the fiber sheet 12 as the cutting direction) or the plane of the fiber sheet 12, such as Fig. 1A, Fig. 2A, Fig. 3A, Fig. 4A, Fig. 5A, Fig. 6A, and Fig. 7.

[0022] (Hydrophobic organic compound) The hydrophobic organic compound is a non-synthetic resin-based compound. The non-synthetic resin-based hydrophobic organic compound is defined as a hydrophobic organic compound excluding petroleum-based synthetic resins. Petroleum-based synthetic resins indicate resins having petroleum as a carbon source. Therefore, the non-synthetic resin-based hydrophobic organic compound may be a resin having a non-petroleum such as a plant as a carbon source, or may be a plant-based biodegradable resin. The non-synthetic resin-based hydrophobic organic compound is preferably a hydrophobic organic compound having a molecular weight of about 10,000 or less, and among them, an organic compound having biodegradability is preferable. Examples of the hydrophobic organic compound having a molecular weight of about 10,000 or less include waxes.

[0023] Examples of waxes include paraffin wax, microcrystalline wax, slack wax, montan wax, ceresin, ozokerite, beeswax, wood wax, carnauba wax, candelilla wax, rice wax, rose wax, sunflower seed wax, polyethylene wax, polypropylene wax, functional wax, Fischer-Tropsch wax, (isostearic acid / beeswax / succinic acid) castor oil, urushi peel wax, barley malt husk wax, octyldodecyl beeswax, orange peel wax, hydrolyzed beeswax, candelilla wax hydrocarbon, kutsubeni suisensen flower wax, synthetic beeswax, synthetic spermaceti wax, dimethiconol beeswax, dimethicone copolyol beeswax, sweet acacia flower wax, hydrogenated rice bran wax, hydrogenated microcrystalline wax, hydrogenated spermaceti wax, stearyl beeswax, shellac wax, centifolia rose flower wax, socheki flower wax, daidai flower wax, damask rose flower wax, tuberose flower wax, niouisentenjikuaoi wax, propolis wax, behenyl beeswax, heliotropium angustifolium wax, jojoba wax, mastic leaf wax, beeswax acid, mimosa acacia flower wax, mimosa acacia leaf wax, apple peel wax, rosemary flower wax, oobanasokei flower wax, orange flower wax, candelilla wax extract, kurofusa suguri bud wax, shiroyama momo fruit wax, niouisumire leaf wax, fusaaakasia flower wax, european strawberry leaf wax, lavender flower wax, lanolin wax, synthetic wax, microcrystalline wax, rice bran wax, beeswax, montan wax, microcrystalline wax, mink wax, spermaceti wax, candelilla wax esters, noibara flower wax, bis-hydroxyethoxypropyl dimethicone beeswax esters, onisarvia flower / leaf / stem wax, dimethicone PEG-8 beeswax, sunflower seed wax, matsurika flower wax, yurinoki leaf wax, ormenis multicaulis flower wax, etc. Also, from the perspective of reducing environmental impact, waxes preferably have biodegradability. When paraffin wax is used as a wax, it is preferable to use one having a molecular weight of about 300 to 550. In addition to the above, as waxes, those containing compounds having hydrophilic groups such as PEG-6 beeswax, PEG-12 beeswax, Solbes-2 beeswax, Solbes-6 beeswax, Solbes-8 beeswax, Solbes-20 beeswax, bisPEG-12 dimethicone beeswax, jojoba wax PEG-80, jojoba wax PEG-120, polyglyceryl-3 beeswax, sodium beeswax fatty acid, PEG-6 sorbitol beeswax, PEG-8 sorbitol beeswax, PEG-20 sorbitol beeswax, PEG-8 beeswax, PPG-5 lanolin wax, etc. (referred to as waxes (A)) may be used. However, from the perspective of moderately exhibiting water repellency, it is preferable that waxes (A) are used in combination with waxes outside the range of these waxes (A).

[0024] (Layout of the surface adhesion part) Regarding the layout of the surface adhesion part 13, in the examples of FIGS. 1A, 1B, 2A, and 2B, the surface adhesion part 13 is formed in a state of being dispersed on the surface 11A of the base material 11 (a state of being distributed in the region of the surface 11A). However, this is just an example, and at least a part of the surface adhesion part 13 may be formed in a state where the portions where the hydrophobic organic compound is attached to the fiber 12A are connected to each other. In the example of FIG. 1B, the surface adhesion part 13 forms a layered part 15 formed in a layered shape as a whole, and a non-formed part 16 is partially formed. The layered part 15 includes any of the following cases: when the surface adhesion part 13 forms a continuous layer (the first case), when it has a structure in which the surface adhesion part 13 is formed in a mottled pattern (the second case), when the surface adhesion part 13 is continuous but the non-formed part 16 is formed in a mottled pattern (the third case), and any combination of the second case and the third case.

[0025] (Non-formed part) The layered portion 15 of the paper-based material 10 according to the present invention has a surface adhesion portion 13, and a non-formation portion 16 of the surface adhesion portion 13 is formed on the surface 11A of the base material 11 in the layered portion 15. The non-formation portion 16 exposes the surface 11A of the base material 11. When the surface adhesion portion 13 is formed in a layered manner as a whole (when forming the layered portion 15), the non-formation portion 16 forms a discontinuous portion in the layered portion 15. Here, the discontinuous portion corresponds to the non-formation portion of the layered portion 15 when observing the portion corresponding to the layered portion 15 in the longitudinal section of the paper-based material 10. That is, in the example of FIG. 1B, the surface adhesion portion 13 is formed discontinuously in the surface direction of the paper-based material 10 in the longitudinal section of the paper-based material 10.

[0026] (Layout of non-formation portion and surface adhesion portion) In the paper-based material 10 according to the present invention, in the layered portion 15, for example, as shown in FIG. 2, it is preferable that at least one of the surface adhesion portion 13 and the non-formation portion 16 is formed in a mottled pattern on the surface 11A of the base material 11. In this case, the surface 11A of the base material 11 is formed in a mottled pattern such that the region where the surface adhesion portion 13 is formed and the region corresponding to the non-formation portion 16 are in a mottled pattern in the plan view of the base material 11. The mottled pattern refers to a pattern formed in a portion where at least one of the region where the surface adhesion portion 13 is formed and the region corresponding to the non-formation portion 16 is dispersedly arranged. Note that the portion where at least one of the region where the surface adhesion portion 13 is formed and the region corresponding to the non-formation portion 16 is dispersedly arranged includes the case where at least one of the region where the surface adhesion portion 13 is formed and the region corresponding to the non-formation portion 16 is dispersedly arranged over the entire region of the surface 11A.

[0027] In the paper-based material 10, at least one of the surface adhesion portions 13 and the non-formation portions 16 is formed in a mottled pattern on the surface 11A of the base material 11, so that both the surface adhesion portions and the non-formation portions exist within a relatively small area in almost any portion of the surface 11A. For this reason, it is less likely to occur that the water resistance of the surface 11A of the base material 11 decreases in a locally aggregated area (a relatively large area), and it is also less likely to occur that the heat sealability of the surface 11A of the base material 11 decreases in a locally aggregated area (a relatively large area).

[0028] As will be described later, the paper-based material 10 can be used to form the lid body 100. However, when joining the lid body 100 formed of the paper-based material 10 to the container 501, if the surface adhesion portions 13 are continuously formed except for the area to be joined to the container 501 in the lid body 100 (that is, when the area where the surface adhesion portions 13 are formed and the area corresponding to the non-formation portions 16 are separated, and the area where the surface adhesion portions 13 are formed and the area corresponding to the non-formation portions 16 are not formed in a mottled pattern), when the positions of the lid body 100 and the container 501 are determined and deviate from the positions, a portion where the surface adhesion portions 13 and the container 501 come into contact is formed in a relatively aggregated area, and the joining of the lid body 100 and the container 501 may be significantly impaired in the aggregated area. This is because the surface adhesion portions 13 often weaken the bonding force by heat sealing or the like compared to the non-formation portions 16. In this regard, since the paper-based material 10 is formed such that the area where the surface adhesion portions 13 are formed and the area corresponding to the non-formation portions 16 form a mottled pattern, even when the positions of the lid body 100 and the container 501 are displaced, the surface adhesion portions 13 and the non-formation portions 16 of the lid body 100 can come into contact with the container 501 in a well-balanced manner, and the joining of the lid body 100 and the container 501 can be ensured throughout the area where they come into contact.

[0029] Further, the non-formed portion 16 is preferably formed such that the surface adhesion portion 13 of the layered portion 15 is a discontinuous portion. In this case, when the lid 100 is formed using the paper-based material 10 and the lid 100 is joined to the container 501, the possibility that only the surface adhesion portion 13 of the lid 100 comes into contact with the container can be more reliably reduced.

[0030] [1-1-2 Action and effect] When obtaining a packaging member such as a lid by processing a blank material formed from a paper-based material, adhesion between a part of the blank material and another part or adhesion between the blank material and another member may be required by a method such as the heat seal method. Therefore, it has been demanded that the paper-based material has sealability by a method such as the heat seal method while improving water resistance.

[0031] In particular, regarding the case where a lid formed from a paper-based material is joined to a container using a method such as the heat seal method, since a resin coating layer is usually formed on the surface of the container for waterproofing the container, even if the types of resins constituting the resin coating layer formed on the surface of the container are diversified, it has been demanded that it is possible to adhere the container and the lid by the heat seal method.

[0032] In conventional paper-based materials, water resistance has been imparted to the paper-based materials by forming a resin layer on the surface of the base material using so-called plastic as a material. In such a case, depending on the combination of the type of resin constituting the resin coating layer formed on the surface of the container and the type of the plastic resin layer formed on the surface of the paper-based material, even if a lid is manufactured using the paper-based material, it may become difficult to heat-seal the lid to the container.

[0033] Furthermore, a paper-based material having a resin layer formed on the surface of the base material using plastic as a material causes an environmental load problem because plastic is used.

[0034] In the paper-based material 10 according to the present invention, a surface adhesion portion 13 to which a hydrophobic organic compound is adhered is formed on the surface 11A of the base material 11. Therefore, the water resistance of the surface of the paper-based material 10 can be improved. Further, when a non-formation portion 16 of the surface adhesion portion 13 is formed in the paper-based material 10 according to the present invention, the surface 11A of the paper-based base material 11 can be exposed. Since the surface 11A of the base material 11 is excellent in the joining property by the heat sealing method to the container 501 even when the types of resins constituting the resin coat layer formed on the surface of the container 501 are diversified, the lid 100 using the paper-based material 10 according to the present invention can be joined to the container 501. Therefore, in the paper-based material 10 according to the present invention, even when the surface adhesion portion 13 to which the hydrophobic organic compound is adhered is formed on the surface 11A of the base material 11, it is possible to avoid the loss of the heat sealability between the lid using the paper-based material 10 and the container.

[0035] In the paper-based material 10 according to the present invention, as the hydrophobic organic compound, a compound corresponding to a non-plastic different from so-called plastic can be preferably used. In the present specification, plastic is generally composed of a high molecular compound having a large molecular weight, which is a polymer of a compound such as a synthetic resin. The molecular weight of the hydrophobic organic compound forming the surface adhesion portion 13 on the surface 11A of the base material 11 is somewhat smaller than that of the high molecular compound constituting general plastic. As described above, as the hydrophobic organic compound, a compound having a molecular weight of about 10,000 or less is preferably used. The hydrophobic organic compound is considered to correspond to a non-plastic different from general plastic. The numerical value of the molecular weight shown for the hydrophobic compound is an example, and even if it exceeds 10,000, as long as it does not satisfy the conditions of a high molecular compound and a polymer, different from general plastic, it may correspond to the hydrophobic organic compound.

[0036] Hydrophobic organic compounds generally have a smaller molecular weight and a relatively low melting point compared to the polymer compounds that make up common plastics as described above. For this reason, it is considered that the surface adhesion portion 13 is likely to form a molten state by the heat during the application of the heat seal method. In the paper-based material 10 according to the present invention, when the surface adhesion portion 13 is temporarily melted by the heat during the application of the heat seal method, it is easy to form a state in which a part of the surface 11A of the base material 11 is substantially exposed, and it can be considered that the heat sealability between the lid 100 and the container 501 using the paper-based material 10 can be prevented from being lost.

[0037] In addition, since the paper-based material 10 uses a paper-based material as the base material 11 and can use a non-plastic as the hydrophobic organic compound, the paper-based material 10 can be made to belong to non-plastics as a whole. Therefore, the paper-based material 10 according to the present invention is also effective in terms of suppressing environmental load.

[0038] [1-2 Second Example] In the paper-based material 10 of the first example according to the present invention, the surface adhesion portion 13 to which the hydrophobic organic compound is adhered is formed on the surface 11A of the base material 11. However, the paper-based material 10 of the present invention is not limited to this, and the hydrophobic organic compound may be adhered to the inside (inner portion 11B) of the base material 11 as shown in FIGS. 3A and 3B. An example configured in this way is referred to as the second example. FIG. 3A is a cross-sectional view schematically showing an embodiment of the paper-based material 10 of the second example. FIG. 3B is an enlarged cross-sectional view schematically showing an example of an enlarged state of a portion of the region XS3 in FIG. 3A. In the second example, the base material and the hydrophobic organic compound are the same as those in the first example. In the description of the second example, the description of the same points as those in the first example will be omitted.

[0039] (Inner Adhesion Portion) In the paper-based material 10 of the second example, an inner adhesion part 14 is formed on the inner side (inner part 11B) of the base material 11. Among the fibers 12A that make up the fiber sheet 12 forming the base material 11, compared with the fibers 12A exposed on the surface 11A of the base material 11, the inner side (when the direction along the thickness direction of the base material 11 towards the center of the base material 11 is defined as the inner direction (+Z direction in FIG. 3B), and the direction away from the center of the base material 11 is defined as the outer direction (-Z direction in FIG. 3B), the inner side in this case), there are parts where a hydrophobic organic compound is attached to the fibers 12A (referred to as the fibers 12A of the inner part 11B of the base material 11). The inner adhesion part 14 is the part where a hydrophobic organic compound is attached to the fibers 12A of the inner part 11B of the base material 11.

[0040] In FIG. 3B, a case where the paper-based material 10 forms the inner adhesion part 14 and the surface adhesion part 13 is shown. In this example, the inner adhesion part 14 and the surface adhesion part 13 are separated, but this is just an example.

[0041] [1-3 Third example] In the paper-based material 10 of the first example, the non-formation part 16 of the surface adhesion part 13 where a hydrophobic organic compound was attached to the surface 11A of the base material 11 was formed, but the paper-based material 10 of the present invention is not limited to this. As shown in FIGS. 4A and 4B, on the surface 11A of the base material 11, the surface adhesion part 13 containing a hydrophobic organic compound may form a continuous layer (a layer covering the surface 11A of the base material 11) as the layer part 15. That is, in the paper-based material 10 of the first example, the surface adhesion part 13 may form a layer. An example of the paper-based material 10 according to the present invention configured in this way is referred to as the third example. FIG. 4A is a cross-sectional view schematically showing an embodiment of the paper-based material 10 of the third example. FIG. 4B is an enlarged cross-sectional view schematically showing an example of the enlarged state of the region XS4 in FIG. 4A. In the third example, the base material and the hydrophobic organic compound are the same as those in the first example. In the description of the third example, the description of the same points as those in the first example will be omitted.

[0042] In the third example, the thickness of the surface adhesion part 13 is preferably such that when a heat history such as during the application of the heat-sealing method is given, the hydrophobic organic compound melts to form a state in which a part of the surface 11A of the base material 11 is substantially exposed.

[0043] [1-4 Example 4] In the paper-based material 10 of the second example, the inner adhesion part 14 and the surface adhesion part 13 were formed separately in a separated state, but the paper-based material 10 according to the present invention is not limited thereto. As shown in FIGS. 5A and 5B, in the second example, at least a part of each of the inner adhesion part 14 and the surface adhesion part 13 may be connected. An example of the paper-based material 10 according to the present invention configured in this way is referred to as the fourth example. FIG. 5A is a cross-sectional view schematically showing an embodiment of the paper-based material 10 of the fourth example. FIG. 5B is an enlarged cross-sectional view schematically showing an example of the enlarged state of the region XS5 in FIG. 5A. In the fourth example, the base material and the hydrophobic organic compound are the same as those in the second example. In the description of the fourth example, the description of the same points as in the second example will be omitted.

[0044] In the paper-based material 10 of the fourth example, a structural part 17 in which the inner adhesion part 14 and the surface adhesion part 13 are connected is formed. The structural part 17 may have a boundary between the inner adhesion part 14 and the surface adhesion part 13, or may have a structure in which the inner adhesion part 14 and the surface adhesion part 13 are continuously and integrally connected as shown in FIG. 5B.

[0045] [1-5 Example 5] In the first to fourth examples, the surface adhesion portion 13 was formed on one surface 11A of the base material 11. However, the paper-based material 10 according to the present invention is not limited to this. As shown in FIGS. 6A and 6B, the surface adhesion portion 13 as shown in any of the first to fourth examples may be formed on both sides (one surface 11A1 and the other surface 11A2) of the base material 11. An example of the paper-based material 10 according to the present invention configured in this way is referred to as the fifth example. FIG. 6A is a cross-sectional view schematically showing an embodiment of the paper-based material 10 of the fifth example. FIG. 6B is an enlarged cross-sectional view schematically showing an example of the enlarged state of the region XS6 in FIG. 6A. In the fifth example, the base material and the hydrophobic organic compound are the same as those in the first example. In the description of the fifth example, the description of the same points as those in the first to fourth examples is omitted.

[0046] In the paper-based material 10 of the fifth example, in the examples of FIGS. 6A and 6B, the surface adhesion portion 13 as shown in the first example is formed on both the one surface 11A1 side and the other surface 11A2 side of the base material 11. However, this is just an example, and the paper-based material 10 of the fifth example is not limited to the case where the surface adhesion portion 13 formed on the one surface 11A1 side of the base material and the surface adhesion portion 13 formed on the other surface 11A2 side of the base material 11 have the same structure. The paper-based material 10 of the fifth example may have different structures for the surface adhesion portion 13 formed on the one surface 11A1 side of the base material and the surface adhesion portion 13 formed on the other surface 11A2 side of the base material 11. For example, a non-formation portion 16 of the surface adhesion portion 13 may be formed on the one surface 11A1 side of the base material 11, and the formation of the non-formation portion 16 may be avoided on the other surface 11A2 side of the base material 11.

[0047] Also, in the paper-based material 10 of the fifth example, when the inner adhesion portion 14 is formed, at least a part of at least one of the surface adhesion portions 13 formed on both surfaces (one surface 11A1 and the other surface 11A2) of the base material 11 may be connected to the inner adhesion portion 14.

[0048] [1-6 Sixth Example] In the paper-based material 10 of the fifth example, the surface adhesion part 13 is formed on both surfaces (one surface 11A1 and the other surface 11A2) of the base material 11, and when the surface adhesion part 13 formed on either surface is formed in a layer (when forming the layered part 15), as shown in FIG. 7, in the present invention, the thickness of the layered part 15 (the thickness of the surface adhesion part 13) may be different. An example of the paper-based material 10 according to the present invention configured in this way is referred to as the sixth example. FIG. 7 is a cross-sectional view schematically showing an embodiment of the paper-based material 10 of the sixth example. In the sixth example, the base material and the hydrophobic organic compound are the same as those in the fifth example. In the description of the sixth example, the description of the same points as those in the first to fifth examples is omitted.

[0049] In the paper-based material 10 of the sixth example, the surface adhesion part 13 formed on one surface 11A1 side of the base material 11 and the surface adhesion part 13 formed on the other surface 11A2 side of the base material 11 may have the same structure or different structures. For example, a non-formation part 16 of the surface adhesion part 13 may be formed on one surface 11A1 side of the base material 11, and the formation of the non-formation part 16 may be avoided on the other surface 11A2 side of the base material 11. Also, the surface adhesion part 13 formed on one surface 11A1 side of the base material 11 and the surface adhesion part 13 formed on the other surface 11A2 side of the base material 11 may be composed of the same material or different materials.

[0050] Next, a manufacturing method of the paper-based material 10 according to the present invention will be described.

[0051] [2 Manufacturing method of paper-based material] An embodiment of the manufacturing method of the paper-based material 10 according to the present invention is shown. Taking the case where the surface adhesion part 13 is formed on both surfaces (one surface 11A1 and the other surface 11A2) of the base material 11 as in the paper-based material 10 of the fifth example as an example for explanation.

[0052] The fiber sheet 12 as the base material 11 constituting the paper-based material 10 is immersed in the immersion liquid (immersion step). The immersion liquid is a mixture of a hydrophobic organic compound and a diffusion liquid (resin-containing liquid). The diffusion liquid can be a liquid capable of forming a state in which the hydrophobic organic compound is diffused in the immersion liquid. Specifically, water can be exemplified as the diffusion liquid, and a mixed liquid of water and a non-aqueous solvent can also be mentioned. The hydrophobic organic compound can improve the water resistance of the paper-based material 10. After the immersion step, a step of drying the fiber sheet 12 (fiber sheet 12 containing the immersion liquid) subjected to the immersion step (drying step) is performed. By subjecting to the drying step, the paper-based material 10 according to the present invention can be obtained as the fiber sheet 12 in which the surface adhesion part 13 to which the hydrophobic organic compound is adhered at least on the surface (both surfaces of one surface 11A1 and the other surface 11A2 of the base material 11) is formed.

[0053] In the manufacturing method described above, the hydrophobic organic compound contained in the immersion liquid can be selected from those shown in the description of the paper-based material 10 according to the present invention. The non-aqueous solvent is not particularly limited as long as it can mix with the hydrophobic organic compound, and examples thereof include alcohol-based solvents such as ethanol.

[0054] In the drying step, the water and non-aqueous solvent contained in the fiber sheet 12 containing the immersion liquid may be in a state where they are almost completely evaporated, or a state where some moisture and non-aqueous solvent remain in the fiber sheet 12.

[0055] Regarding the amount of the hydrophobic organic compound contained in the immersion liquid, the weight ratio of the hydrophobic organic compound to the weight of the immersion liquid is preferably about 1% by weight.

[0056] According to the manufacturing method described above, by determining the fiber sheet 12, the immersion liquid, and the immersion conditions, as the paper-based material 10 according to the present invention, a surface adhesion part 13 having a hydrophobic organic compound on both surfaces of the base material 11, an inner adhesion part 14 is formed inside the base material 11, and a structural part 17 in which the surface adhesion part 13 and the inner adhesion part 14 are formed continuously and integrally can also be obtained.

[0057] Note that the manufacturing method of the paper-based material 10 is only an example and is not limited to the above method.

[0058] For example, as the manufacturing method of the paper-based material 10 according to the present invention, a liquid containing a hydrophobic organic compound is used as a coating liquid, and known coating methods such as various roll coating and spray coating methods, printing methods such as gravure printing and screen printing, etc. can be exemplified by coating and drying on the surface of a fiber sheet serving as a base material.

[0059] The lid 100 using the paper-based material 10 according to the present invention will be described.

[0060] [3 Lid] The lid 100 according to the present invention may be configured as shown in FIGS. 8A, 8B, and 8C. The example of the lid 100 shown in the examples of FIGS. 8A, 8B, and 8C is referred to as the first example. FIG. 8A is a plan view showing an embodiment of the lid 100 of the first example. FIG. 8B is a view schematically showing the state of the longitudinal section taken along line A-A of FIG. 8A. FIG. 8C is an enlarged cross-sectional view schematically showing an example of the enlarged state of the region XS7 of FIG. 8B.

[0061] [3-1 First Example of Lid] [3-1-1 Configuration] The lid 100 of the first example has a blank material for lid formation (blank material 130) formed from the above-described paper-based material 10 according to the present invention or a structure processed therefrom, as shown in FIGS. 8A, 8B, and 8C.

[0062] As will be described later with reference to FIGS. 17A, 17B, etc., the lid 100 of the first example is formed so as to be joinable to a container 501 having an opening 502 formed at the upper end and an edge 503 that is an upper edge forming the outer periphery of the opening 502. FIGS. 17A and 17B are a perspective view and a cross-sectional view showing an example of a container 300 with a lid in which the lid 100 shown in FIG. 8 is joined to the container 501. The lid 100 can be used by being joined along the edge 503. In the lid 100, the region joined to the edge 503 in a plan view of the lid 100 is called a joining region R. FIG. 8A is a plan view showing an embodiment of the lid 100. FIG. 8B is a cross-sectional view schematically showing a longitudinal cross-section taken along line A-A of FIG. 8A. As the container 501, a container having flexibility at the edge 503 of the opening 502 is more preferably used. However, these do not prohibit the container 501 from being a container with little or almost no flexibility, such as a metal container.

[0063] In the example of FIG. 1A, the joining region R corresponds to a region that is generally formed in an annular shape along the opening 502 in a shape corresponding to the opening 502 of the container 501.

[0064] (Blank material) The lid 100 is formed from a blank material 130 as shown in FIGS. 8A, 8B, and 8C. The blank material 130 is obtained by processing the paper-based material 10 according to the present invention into a shape corresponding to the shape of the lid 100. For example, if the lid 100 is formed in a circular shape, the paper-based material 10 processed into a circular shape becomes the blank material 130. Note that the lid 100 being formed of the blank material 130 is not limited to the case where the lid 100 is formed only of the blank material 130, and includes cases where the lid 100 has a structure in which a member such as a tab member 122 is attached to the blank material 130, and also includes cases where various processing treatments such as a shaping treatment (embossing treatment, etc.) are performed on the blank material 130. In the example of FIG. 8C, the blank material 130 is used as the paper-based material 10, and a surface adhesion portion 13 is formed on one surface 11A of the fiber sheet 12 serving as the base material 11, and a layered portion 15 is formed as a whole on the surface 11A, but this is just an example. For example, the paper-based material 10 that can be used when forming the blank material 130 may be the same as the various paper-based materials 10 described above with reference to FIGS. 1A to 7 and the like, with surface adhesion portions 13 formed on both surfaces 11A of the base material 11, or inner adhesion portions 14 may be formed, or a structural portion 17 may be formed, and the layered portion 15 may have a non-formed portion 16 that becomes a discontinuous portion, or the formation of the non-formed portion 16 may be avoided.

[0065] The lid 100 has a joint region corresponding portion 105A and a lid region corresponding portion 105B.

[0066] (Joint region corresponding portion) The joint region corresponding part 105A is a part corresponding to the region where the lid 100 is joined to the container 501 along the edge 503 of the container 501. That is, the joint region corresponding part 105A is a part of the lid 100 corresponding to the joint region R (the region facing the edge 503 of the container 501 and the region joined to the container 501). In the container 300 with a lid, the joint region corresponding part 105A is a part of the lid 100 that forms the joint portion 651 between the lid 100 and the container 501. Specifically, in the plan view of the lid 100 (in the example of FIG. 8A, when the Z-axis direction (vertical direction) is the line-of-sight direction), the part forming the joint region R is defined as the joint region corresponding part 105A. The joint region corresponding part 105A is usually formed in an annular shape as shown in FIG. 8A. In particular, as shown in FIG. 8A, when the edge 503 of the container 501 is generally formed in an annular shape, the joint region R becomes annular, and the joint region corresponding part 105A also becomes generally annular in the plan view of the lid 100. The outer edge of the joint region corresponding part 105A is determined according to the position of the outer edge of the joint region R. The outer edge of the joint region corresponding part 105A may be located on the outer peripheral edge of the lid 100, or may be located inside the outer peripheral edge of the lid 100 as shown in the example of FIG. 8A. When the joint region R between the lid 100 and the container 501 is not continuously formed, the part sandwiched between adjacent joint regions R and the part facing the edge 503 are also included in the joint region corresponding part 105A to be described later.

[0067] In the lid 100 shown in the example of FIG. 8A, in the part corresponding to the joint region corresponding part 105A, a hydrophobic organic compound is attached to the surface of the fiber sheet 12 that serves as the base material 11 of the paper-based material 10 forming the lid 100, and the surface attachment part 13 is formed. As shown in FIG. 8C, the surface attachment part 13 is preferably formed on the surface of the fiber sheet 12, that is, at least on the surface of the lid 100 on the side of the facing surface 173 with the container 501 (the side opposite to the exposed surface 172).

[0068] (Cover region corresponding part) The lid region corresponding part 105B is the inner part of the lid body 100 from the joint region corresponding part 105A. That is, the lid region corresponding part 105B is the inner part from the inner edge end of the joint region corresponding part 105A, and the outer peripheral end of the lid region corresponding part 105B is common with the inner edge end of the joint region corresponding part 105A. The lid region corresponding part 105B is the part that covers the opening 502 in the container 300 with a lid. Note that the part that covers the opening 502 is the part that covers at least a part of the opening 502, and includes cases such as when having the small opening 106 as described in the third example.

[0069] (Outer region corresponding part) As shown in the example of FIG. 8A, the outer part from the outer peripheral end of the lid region corresponding part 105B of the lid body 100 is called the outer region corresponding part 105C (in the third example described later, the outer region corresponding part 105C corresponds to the outer part from the inner edge end of the joint region corresponding part 105A in the base part 102).

[0070] From the viewpoint of reducing environmental load, it is preferable that the paper-based material 10 is exposed on at least one surface (the exposed surface 172 or the opposing surface 173) of the lid body 100. More specifically, it is preferable that the fibers constituting the paper-based material are exposed. Further, such a lid body 100 can be realized by using the one having the non-forming part 16 as exemplified in FIG. 2B as the paper-based material 10. Also, from the viewpoint of improving the certainty of joining between the lid body 100 and the container 501, at least one of the surface adhesion part 13 and the non-forming part 16 is sparsely formed on the paper-based material 10 forming the lid body 100 (the surface adhesion part 13 and the non-forming part 16 are formed such that at least one of the surface adhesion part 13 and the non-forming part 16 is dispersedly arranged).

[0071] [3-1-2 Action and effect] Hitherto, there has been a demand for improvement in that the lid body can be adhered to the container by a sealing method even when the types of resins constituting the resin coat layer formed on the surface of the container are various.

[0072] On the other hand, according to the lid 100 according to the first example, since the lid 100 is formed using the paper-based material 10 of the present invention, it is possible to improve the water resistance of the lid 100 with the surface adhesion part 13 formed of a hydrophobic organic compound. Further, when the heat seal method is applied when attaching the lid 100 to the container 501, and when the non-formation part 16 of the surface adhesion part 13 is formed in the paper-based material 10, the resin constituting the resin coat layer formed on the surface of the edge part 503 of the container 501 can be joined to the fibers exposed in the non-formation part 16, and it is also possible to form an adhesive state between the resin coat layer and the lid 100.

[0073] [3-2 Second Example of Lid] As shown in FIGS. 9A and 9B, an insertion port 119 may be formed in the lid 100 according to the first example of the present invention. An example of the lid configured in this way is referred to as the second example. FIGS. 9A and 9B are a plan view and a cross-sectional view schematically showing an embodiment of the lid 100 of the second example. Further, FIG. 9B is a view schematically showing the state of the longitudinal cross-section taken along the line B-B of FIG. 9A. In the second example, the base material and the hydrophobic organic compound are the same as those in the first example. In the description of the second example, the description of the same points as those in the first example is omitted.

[0074] (Insertion Port) The insertion port 119 is a structural part that enables various members to be inserted into the container 501 from the outside when the lid 100 is used for a container 300 with a lid. Examples of the insertable members include a straw and the like. The insertion port 119 is formed at least in the lid region corresponding part 105B, and in the examples of FIGS. 9A and 9B, it is formed by the through-hole 110. The through-hole 110 has a structure (a structure that penetrates) cut in the vertical direction (thickness direction, Z-axis direction) from one surface (exposed surface 172) to the other surface (opposing surface 173) of the blank material 130, and is a so-called cut part 108. Note that this through-hole 110 can function as a gas vent part. Here, the gas vent part refers to a part that allows gas to pass from one surface side to the other surface side (from the opposing surface 173 side to the exposed surface 172 side) of the lid 100.

[0075] (Shape of the insertion port) The shape of the insertion port 119 is not particularly limited as long as it can be formed by a cut. For example, in the example of FIG. 9A, a cut portion 108 having a shape in which the blank material 130 is cut crosswise in the vertical direction is formed in the lid body 100, and this cut portion 108 forms a through portion 110, and this through portion 110 forms the insertion port 119. Note that this is just an example, and the shape of the cut portion 108 forming the through portion 110 is not limited to a cross shape and may be a C shape or various other shapes such as a tongue shape as long as it can be used as the insertion port 119.

[0076] In the lid body 100, as shown in FIG. 9B, the cross section of the base material 11 is exposed on the cut surface of the cut forming the through portion 110, and at least a part of the portion corresponding to the surface 11A of the base material 11 has the surface attachment portion 13 exposed (in FIG. 9B, the cross section of the layered portion 15 is exposed). This is preferable. In this case, it is possible to somewhat suppress the seepage of the liquid contained in the container 501 from the through portion 110 into the base material 11.

[0077] Next, a modification of the lid body 100 of the second example will be described.

[0078] In the lid body 100 of the second example, when the insertion port 119 is formed in the lid body 100, as shown in FIGS. 10A and 10B, the insertion port 119 may be formed by a weakening portion 114. This form is referred to as a modification of the second example. FIG. 10A is a plan view schematically showing an embodiment of the lid body 100 according to the modified example of the second example. FIG. 10B is a view schematically showing an example of a longitudinal cross section taken along the line C-C of FIG. 10A.

[0079] (Weakening portion) As shown in the example of FIG. 10A, the weakening portion 114 has a plurality of through portions 110 and at least one continuous portion 115 formed between the ends of at least two through portions 110. The weakening portion 114 guides the position (the splitting position) where splitting occurs when a lifting or pushing-down force is applied to the weakening portion 114 to form a splitting portion in the lid body. That is, the position where splitting occurs is generally formed along the weakening portion. For example, in the example of FIG. 10A, when a pushing-down force is applied to the portion corresponding to the insertion opening 119 from the exposed surface 172 side to the opposing surface 173 side, the continuous portion 115 is broken, splitting occurs along the through portion 110 from the continuous portion 115, and a state where the insertion opening 119 is opened (the insertion opening 119 is in an open state) is formed.

[0080] (Layout of the weakening portion) The layout of the weakening portion 114 is not particularly limited and may be determined according to conditions such as the function of the weakening portion 114. In the example of the weakening portion 114 shown in the example of FIG. 10A, the continuous portion 115 is formed at one location, and a total of four through portions 110 are formed. In this example, the through portions 110 are formed to extend radially in four different directions from the continuous portion 115. Note that this is an example of the weakening portion 114. In the case where a plurality of through portions 110 are formed radially around the continuous portion 115, the through portions 110 may extend in three directions away from the continuous portion 115, or may extend in five or more directions. Also, the through portions 110 may extend in two directions away from the continuous portion 115.

[0081] Also, in the example of FIG. 10A, the weakening portion 114 is formed in a cross shape, but it may be formed in a C shape. Also, it is not limited to the case where the formation location of the continuous portion 115 as shown in the example of FIG. 10A is formed at one location, and it may be formed at a plurality of locations.

[0082] The position of the weakening portion 114 is not particularly limited, but it is preferably provided in the lid region corresponding portion 105B. In this case, a splitting position will be formed in the lid region corresponding portion 105B.

[0083] (Continuous part) The continuous part 115 may be a part that is formed without penetrating the blank material 130 forming the lid body 100, and may be an uncut part. Alternatively, as shown in FIG. 10B, it may be a half-cut part 116 obtained by cutting the blank material 130 in the thickness direction within a range that avoids penetrating the blank material 130 (lid body 100). FIG. 10B is a diagram for explaining an example in the case where the continuous part 115 is the half-cut part 116. The half-cut part 116 is specified as a part that forms a half-cut structure in which the lid body 100 is cut halfway in the thickness direction of the lid body 100. Note that the half-cut part 116 is not limited to a part that is cut to half of the thickness of the lid body 100 in the thickness direction of the lid body 100. The half-cut part 116 includes a structure in which the lid body 100 is cut more than half of its thickness while avoiding penetration of the lid body 100, and a structure in which the lid body 100 is cut in the thickness direction to less than half of its thickness. Here, the case where the continuous part 115 is the half-cut part 116 has been described, but the entire part forming the insertion opening 119 may be the half-cut part 116.

[0084] [3-3 Third example of lid body] The lid body 100 of the first example according to the present invention may include, as shown in FIGS. 11A, 11B, and 11C, a base part having a small opening with an opening area smaller than the opening 502 of the container 501, a small lid part for opening and closing the small opening, and a hinge part connecting the base part and the small lid part. An example of the lid body 100 configured in this way is referred to as the third example. FIGS. 11A and 11B are a plan view and a cross-sectional view schematically showing an example of the lid body of the third example. FIG. 11C is a cross-sectional view for explaining a state in which the small lid part is displaced to expose the small opening. In the third example, the base material, the hydrophobic organic compound, the bonding region corresponding part, the lid region corresponding part, and the outer region corresponding part are the same as those of the lid body 100 of the first example. In the description of the third example, the description of the same points as those described for the lid body 100 of the first example will be omitted.

[0085] The lid 100 of the third example has a base portion 102, a small lid portion 103, and a hinge portion 104 as shown in FIGS. 11A, 11B, etc. In the examples of FIGS. 11A and 11B, the lid region corresponding portion 105B of the lid 100 has the base portion 102, the small lid portion 103, and the hinge portion 104, and the outer region corresponding portion 105C has the base portion 102 (the base portion 102 is formed across the lid region corresponding portion 105B and the outer region corresponding portion 105C).

[0086] (Base portion) The base portion 102 is defined as a portion that has the joint region corresponding portion 105A and forms the small opening 106. The base portion 102 can be a portion that determines the reference for the displacement of the small lid portion 103 described later. In the example of FIG. 7A, in a plan view of the lid 100, the base portion 102 and the small lid portion 103 form the exposed surface 172 of the lid 100. In the lid 100 according to the third example, in a plan view of the lid 100 (when the Z-axis direction (vertical direction) is the line-of-sight direction in the example of FIG. 11A), the joint region corresponding portion 105A corresponds to the portion forming the joint region R and is formed on the base portion 102.

[0087] (Small opening) The small opening 106 is formed so as to penetrate the facing surface 173 of the lid 100 with respect to the container 501 and the non-facing surface of the lid 100 with respect to the container 501 (the exposed surface 172 of the lid 100). In FIG. 11A, the small opening 106 is formed as an opening formed inside the base portion 102 (a position closer to the center CT than the outer peripheral edge 195 of the outer region corresponding portion 105C). The small opening 106 is formed such that the opening area is smaller than that of the opening 502 of the container 501 inside the portion corresponding to the joint region corresponding portion 105A in a plan view of the lid 100. The small opening 106 is for opening an entrance and exit for the contents (such as beverages and food) in the space portion 505 of the container 501 when the lid 100 is joined to the container 501. The small opening 106 forms an opening forming portion 120 in combination with the small lid portion 103 described later.

[0088] (Opening forming portion) As shown in FIG. 11A etc., the opening forming portion 120 is defined as a portion having the small opening 106 and the small lid portion 103. In the opening forming portion 120, the small opening 106 opens and closes as the small lid portion 103 is displaced. The opening forming portion 120 is formed such that, as shown in FIGS. 11A and 11B, the small lid portion 103 closes the small opening 106, and as shown in FIG. 11C, the small lid portion 103 is displaced and the small opening 106 is open. When the small lid portion 103 is rotated so as to lift the small lid portion 103 with respect to the base portion 102 as a reference, the small opening 106 is exposed and becomes an exposure port. That is, when the small lid portion 103 is lifted in a state where the lid body 100 is attached to the container 501, the small opening 106 and the small lid portion 103 are combined so that the space portion 505 of the container 501 can be visually recognized from the small opening 106.

[0089] Note that in a state where the small opening 106 has become an exposure port, it can be used as a supply port for additional liquid such as beverage or solid matter such as ice as described later. Further, when there is a liquid such as a beverage inside the container 501 (space portion 505), the small opening 106 may be used as a drinking port or a pouring port for the beverage or the like.

[0090] (Small lid portion) The lid body 100 is provided with a small lid portion 103. The small lid portion 103 is formed so as to be able to cover the small opening 106 in an openable and closable manner. The small lid portion 103 is formed so as to be displaceable to a lifted state with respect to the base portion 102, and the small opening 106 is formed (opened) when the small lid portion 103 is lifted. In the example shown in FIG. 11A, in a state where the small lid portion 103 closes the small opening 106, the shape of the small lid portion 103 can be determined such that the outer peripheral contour shape of the small lid portion 103 follows the shape of the opening edge 106A of the small opening 106. In this case, in a state where the small lid portion 103 closes the small opening 106, it becomes easy to bring the end face of the outer peripheral edge 103A of the small lid portion 103 into contact with the end face of the opening edge 106A of the small opening 106.

[0091] In the lid 100 shown in the example of FIG. 11A, the small lid portion 103 is provided inside (the lid region corresponding portion 105B) (on the center CT side of the lid region corresponding portion 105B) of the joint region corresponding portion 105A in a plan view of the lid 100. The small lid portion 103 is displaced (rotated) so as to be in a lifted state. The small lid portion 103 is connected to the base portion 102 by a hinge portion 104. As the small lid portion 103 is lifted with the hinge portion 104 as a support shaft, the small opening 106 is exposed.

[0092] In the lid 100, when the small lid portion 103 is raised, as described above, the small opening 106 is in an exposed state. This state is called an open lid state. The state in which the small opening 106 is covered by the small lid portion 103 is called a closed lid state.

[0093] In the lid 100, even after the lid is opened (after the small opening 106 is exposed by lifting the small lid portion 103), it is possible to return to the closed lid state again. When in the closed lid state, the end face (outer peripheral end face) of the outer peripheral edge 103A of the small lid portion 103 can face the end face of the opening edge 106A of the small opening 106 of the base portion 102.

[0094] (Hinge portion) As described above, the lid 100 has a hinge portion 104. The hinge portion 104 is generally configured by a portion corresponding to a line segment connecting two base end portions 174 along the outer peripheral edge 103A of the small lid portion 103, and corresponds to the boundary portion between the base portion 102 and the small lid portion 103. The hinge portion 104 is a portion that serves as a rotation axis when the small lid portion 103 rotates. However, when the small lid portion 103 rotates, it includes not only the case where the small lid portion 103 rises from the base portion 102 at a certain angle at the position of the hinge portion 104, but also the case where the small lid portion 103 rises while gradually curving from the hinge portion 104 toward the front edge portion 175 of the small lid portion 103.

[0095] The base portion 102 is connected to the small lid portion 103 at least at the hinge portion 104. The structure of the hinge portion 104 is not particularly limited as long as it is a portion defined as the boundary between the base portion 102 and the small lid portion 103. Similar to the connection structure described later, the hinge portion 104 may be a perforation structure or a half-cut portion.

[0096] (Boundary between the outer peripheral edge of the small lid portion and the opening edge of the small opening) At the boundary position between the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106, in the state of the lid body 100 when not in use (when the open-lid state is not formed), the small lid portion 103 and the small opening 106 may be separated (may be in a non-connected state), or a connection structure may be formed as described later. When the small lid portion 103 and the small opening 106 are in a non-connected state at the boundary position between the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106, a structure (for example, a structure portion similar to the through portion 110) that separates the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106 is formed. Since the structure of the through portion 110 is the same as that described for the lid body 100 of the second example, the description thereof is omitted.

[0097] (Connection structure between the base portion and the small lid portion) In the lid body 100, at the boundary position between the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106, a structure (connection structure) connected by the opening edge 106A of the small opening 106 of the base portion 102 and the outer peripheral edge 103A of the small lid portion 103 may be formed as described above. As shown in FIG. 16B corresponding to the lid body 100 of the sixth example described later, the connection structure has a continuous portion 115, and it is preferable that the same structure as the weakening portion 114 is adopted. In this case, the weakening portion 114 serving as the connection structure is configured as a portion more fragile than the small lid portion 103. Since the connection structure is the weakening portion 114, when the small lid portion 103 rotates with respect to the base portion 102 about the hinge portion 104, the weakening portion 114 can be broken (the continuous portion 115 can be broken). Further, the small lid portion 103 is raised with respect to the base portion 102 while being separated from the base portion 102 generally along the connection structure 117.

[0098] (Weakening section) The weakening section 114 serving as the connection structure may be formed by a combination (perforation structure) of the through-hole portion 110 and the continuous portion 115 as described for the lid body 100 of the second example. In the example of the connection structure shown in FIG. 16B, the weakening section 114 which is the connection structure has a combined structure of the continuous portion 115 and the through-hole portion 110. When the connection structure has the continuous portion 115 and the through-hole portion 110, the continuous portion 115 may be the half-cut portion 116 as described with reference to FIG. 10B for the lid body 100 of the second example.

[0099] Note that the connection structure is not limited to the perforation structure, and the entire connection structure may be formed as a portion having the same structure as the half-cut portion 116 described with reference to FIG. 10B for the lid body 100 of the second example. That is, the boundary position between the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106 may be entirely formed by the half-cut portion 116.

[0100] Regarding the modification example of the third example of the lid body, further description will be continued.

[0101] (Modification Example 1 of the Third Example of the Lid Body) As shown in FIGS. 12A, 12B, etc., the lid body 100 of the third example may be provided with a knob portion 121 on the small lid portion 103. The lid body 100 having such a configuration is referred to as Modification Example 1 of the third example. FIG. 12A is a plan view schematically showing an embodiment of the lid body 100 according to Modification Example 1 of the third example. FIG. 12B is a cross-sectional view schematically showing the state of the longitudinal section taken along line E-E of FIG. 12A.

[0102] The lid body 100 according to Modification Example 1 of the third example may be the same as the lid body 100 according to the third example described above except that the knob portion 121 is provided on the small lid portion 103. Therefore, descriptions of other configurations (the base portion 102, the hinge portion 104, etc.) except for the configuration in which the knob portion 121 is provided on the small lid portion 103 are omitted.

[0103] (Knob portion) In Modification Example 1 of the third example shown in FIGS. 12A and 12B, in a state where the small lid portion 103 closes the small opening 106, a knob portion 121 is provided on the upper surface side, which is the exposed surface side of the small lid portion 103 (the exposed surface 172 of the lid body 100). The structure of the knob portion 121 is not particularly limited as long as the small lid portion 103 can be rotated about the hinge portion 104. In the examples of FIGS. 12A and 12B, a tab member 122 is provided as the knob portion 121.

[0104] (Tab member) In the examples of FIGS. 12A and 12B, in a state where the small lid portion 103 closes the small opening 106, one end portion 122A of the tab member 122 is joined to the small lid portion 103, and the other end portion 122B of the tab member 122 is a free end. The portion of the tab member 122 joined to the small lid portion 103 is called a tab joint portion 123. Except for the tab joint portion 123 of the tab member 122, the portion on the free end side of the tab member 122 (the portion on the other end portion 122B side) is not particularly limited as long as it is formed in a size and shape that allows a person to pick up the tab member 122 by hand. The material of the tab member 122 may be the same as the material of the lid body 100 (the material of the paper-based material 10) described in the lid body 100 of the first example, and may be composed of a material having a paper-based material.

[0105] In the lid body 100, the attachment position and attachment direction of the tab member 122 to the small lid portion 103 are not particularly limited. In the examples of FIGS. 12A and 12B, the tab member 122 is joined to the small lid portion 103 at a position near the tip of the small lid portion 103 (that is, near the front edge portion 175).

[0106] Methods for joining the tab member 122 to the small lid portion 103 (i.e., methods for forming the tab joint portion 123) can include various methods such as ultrasonic bonding, heat sealing, and bonding with an adhesive. Among the above methods, ultrasonic bonding is preferred as the method for forming the tab joint portion 123 from the viewpoints of ease of bonding and bonding strength. The formation position of the tab joint portion 123 in the small lid portion 103 is preferably at a position displaced from the central portion of the small lid portion 103 from the viewpoint of facilitating the lifting (rotating) of the small lid portion 103 by lifting the tab member 122.

[0107] (Orientation (mounting direction) of the tab member) In the lid body 100, in the example of FIG. 12A, the other end portion 122B side (free end side) of the tab member 122 is arranged closer to the hinge portion 104 than the one end portion 122A of the tab member 122. However, this is just an example, and the orientation of the tab member 122 may be other than the direction shown in the example of FIG. 12A. For example, the tab member 122 may be arranged such that the other end portion 122B side of the tab member 122 is at a position farther from the hinge portion 104 than the one end portion 122A of the tab member 122.

[0108] In the lid body 100 according to the first modification of the third example, by providing the knob portion 121, the small lid portion 103 can be easily lifted (put in the state of lifting the small lid portion 103 as shown in FIG. 11C).

[0109] (Second modification of the third example of the lid body) In the lid body 100 according to the first modification of the third example, as shown in the examples of FIGS. 13A and 13B, a holding structure forming portion may be provided, which is a portion for forming a holding structure for holding the small lid portion 103 in a state where the small lid portion 103 is rotated with respect to the base portion 102 about the hinge portion 104 to open the small opening 106. The lid body 100 having such a configuration is referred to as the second modification of the third example. FIG. 13A is a plan view schematically showing an embodiment of the lid body 100 according to the second modification of the third example. FIG. 13B is a cross-sectional view schematically showing the state of the longitudinal section taken along the line F-F of FIG. 13A.

[0110] (Retention structure forming part) The configuration of the retention structure forming part is not particularly limited. For example, in the example of the lid body 100 shown in FIGS. 13A and 13B, the claw portion 124 and the receiving portion 125 form the retention structure forming part.

[0111] (Claw portion) The claw portion 124 may be a portion having a structure capable of being locked to the receiving portion 125 described later by hanging or inserting, etc., as shown in the example of FIG. 13A. In the example of FIG. 13A, the claw portion 124 is provided on the tab member 122 as an example of the grip portion 121. Also, in this example, the claw portion 124 is formed by a cut portion formed in a contour shape such as a generally mountain shape at a predetermined position of the tab member 122.

[0112] (Receiving portion) The receiving portion 125 is formed in a shape that allows the claw portion 124 to be hooked or inserted. In the example of FIG. 13A, the receiving portion 125 is a slit portion formed by a cut at a predetermined position of the base portion 102. In this case, the receiving portion 125 may be a structural portion corresponding to the through portion 110 described in the second example of the lid body 100. The receiving portion 125 is formed at a position where it can face the claw portion 124 when the tab member 122 is displaced so as to rotate the small lid portion 103.

[0113] (Formation of the retention structure) When the small lid portion 103 is raised in the lid body 100 or the like, the grip portion 121 is pulled up. At this time, the tab member 122 is pulled up and a predetermined portion on the free end side (the other end portion 122B side) of the tab member 122 is bent so that the claw portion 124 protrudes downward or upward. Then, the tab member 122 is displaced so as to rotate the small lid portion 103 until the claw portion 124 of the small lid portion 103 reaches a position facing the receiving portion 125 or a position in the vicinity of that position. Then, the claw portion 124 of the tab member 122 is hooked or inserted into the receiving portion 125. Thereby, a retention structure for holding the small lid portion 103 in a state where the small opening 106 is exposed is formed.

[0114] [Fourth Example of the Cover Body] In the cover bodies 100 of the first to third examples, as shown in FIGS. 14A and 14B, etc., at least one of the convex portion 143 and the concave portion 144 may be formed. A cover body having such a structure is referred to as the fourth example. FIG. 14A is a plan view schematically showing an embodiment of the cover body 100 according to the fourth example. FIG. 14B is a cross-sectional view schematically showing the state of the longitudinal cross-section taken along line G-G of FIG. 14A. In the fourth example, the base material, the hydrophobic organic compound, the bonding region corresponding portion, the cover region corresponding portion, and the outer region corresponding portion are the same as those of the cover body 100 of the first example. In the description of the fourth example, the description of the same points as those described for the cover bodies 100 of the first to third examples will be omitted.

[0115] (Convex Portion) The convex portion 143 is formed on the exposed surface 172 side of the cover body 100. The convex portion 143 is preferably provided inward from the inner edge end of the bonding region corresponding portion 105A. That is, the convex portion 143 may be formed over the entire cover region corresponding portion 105B, or may be provided in a part inside the cover region corresponding portion 105B. In the examples of FIGS. 14A and 14B, the convex portion 143 is continuously formed from the concave portion 144 to the inner portion. Note that the convex portion 143 indicates a portion protruding upward (+Z direction side) along the vertical direction (Z-axis direction) with respect to the position of the bonding region corresponding portion 105A. Note that further unevenness may exist inside the formed portion of the convex portion 143.

[0116] (Depressed Portion) On the side opposite to the exposed surface 172 of the cover body 100 (the opposing surface 173 side), a depressed portion 145 is formed at a portion corresponding to the convex portion 143 (the opposite portion). In this case, the portion forming the convex portion 143 becomes the convex structure portion in the emboss structure.

[0117] (Concave Portion) In the examples of FIGS. 14A and 14B, as described above, a concave portion 144 is formed around the convex portion 143. In this example, the concave portion 144 forms a groove-like structure formed in an annular shape. Note that the convex portion 143 indicates a portion that protrudes upward (+Z direction side) along the vertical direction (Z-axis direction) with reference to the position of the joint region corresponding portion 105A. Note that there may be further irregularities inside the portion where the concave portion 144 is formed.

[0118] (Protrusion) On the side opposite to the exposed surface 172 of the lid body 100 (the side of the opposing surface 173), a protruding portion 146 is formed at a portion corresponding to (opposite to) the concave portion 144. In this case, the portion forming the concave portion 144 becomes a concave structure portion in the embossed structure.

[0119] The convex portion 143 of the lid body 100 may be formed with an insertion port 119 or the like described in the second example. In this case, when the content accommodated in the container 300 with a lid described later is a liquid, a height difference structure (a structural portion that forms a positional difference in the Z-axis direction in the lid body 100) is formed by the recessed portion 145 and the protruding portion 146 on the side of the opposing surface 173, so that the liquid can be prevented from leaking from the insertion port 119 to the outside of the lid body 100.

[0120] If a height difference structure can be formed on the side of the opposing surface 173 of the lid body 100, it is not necessary to form both the convex portion 143 and the concave portion 144 as shown in FIGS. 14A and 14B. For example, as shown in FIG. 14C, the lid body 100 may be formed with only the convex portion 143 by omitting the formation of the concave portion 144, or as shown in FIG. 14D, the lid body 100 may be formed with only the concave portion 144 by omitting the formation of the convex portion 143.

[0121] [3-5 Fifth Example of Lid Body] In the lid body 100 of the first to fourth examples according to the present invention, as shown in FIG. 15, a content identification portion 152 configured by a combination structure of a label portion 150 and a display portion 151 may be formed in the outer region corresponding portion 105C. A lid body having such a structure is referred to as the fifth example. FIG. 15 is a plan view schematically showing an embodiment of the lid 100 according to the fifth example.

[0122] The lid 100 according to the fifth example is the same as those of the first to fourth examples in other configurations except for the combined structure of the label portion 150 and the display portion 151. In the description of the fifth example, descriptions of the same points as those described for the lids of the first to fourth examples are omitted.

[0123] (Label portion) The lid 100 includes a plurality of label portions 150 on the outer peripheral edge 195 of the outer region corresponding portion 105C. The label portion 150 may be formed by a portion (extending portion) extending outward from the outer peripheral edge 195 of the outer region corresponding portion 105C. The label portion 150 is individually foldable about the base end 150A. The base end 150A of the label portion 150 is assumed to be a portion defined by a straight line connecting two positions (protrusion start positions NB1, NB2) where the protrusion starts along the outer peripheral edge 150B of the label portion 150 generally. The size and shape of the label portion 150 are not particularly limited as long as the user can fold the label portion 150 by hand or the like to a protruding shape. When three or more label portions 150 are formed, the label portions 150 may be formed so that their separation intervals are equal.

[0124] (Display portion) Preferably, for at least some of the label portions 150 among the label portions 150, the display portion 151 is provided at a position shifted from the label portion 150 toward the inside of the lid region corresponding portion 105B. In the case where the display portion 151 is provided at a position shifted from the label portion 150 toward the inside of the lid region corresponding portion 105B, the case where the display portion 151 is formed across both a portion of the label portion 150 and a portion shifted from the label portion 150 toward the inside of the lid region corresponding portion 105B is also included.

[0125] The display portion 151 may be any of characters, figures, shaped forms, colors, symbols, etc., or a combination thereof. Also, the display portions may be connected to each other. In the example of FIG. 15, the display portion 151 is composed of characters. Each display portion 151 may be, for example, a portion forming characters such as COLA, TEA, JUICE, OTHER, etc. Note that the display portion 151 may be a printing portion or a portion having a concavo-convex shape formed by embossing or the like. In the example of FIG. 15, the display portion 151 is a printing portion. In this example, the printing portion is a portion where characters are printed.

[0126] (Combination of label portion and display portion) The combination of the label portion 150 and the display portion 151 constitutes the content identification portion 152. In the lid 100 according to the fifth example, since the combination of the label portion 150 and the display portion 151 is formed and the label portion 150 and the display portion 151 are formed at displaced positions, when the label portion 150 is bent to identify the content, it is possible to suppress the display portion 151 from being hidden, and the combination of the label portion 150 and the display portion 151 can effectively function as the content identification portion 152.

[0127] [3-6 Sixth example of lid] In the lids 100 of the first to fourth examples according to the present invention, as shown in FIG. 16A, an extension portion 111 may be formed in the outer region corresponding portion 105C. A lid having such a structure is referred to as the sixth example. FIG. 16A is a plan view schematically showing an embodiment of the lid 100 according to the sixth example.

[0128] (Extension portion) The extension portion 111 is formed as a portion extending outward in the outer direction from the outer peripheral edge 195 of the outer region corresponding portion 105C. The shape of the extension portion 111 is not particularly limited, but in the example of FIG. 16A, the shape of the extension portion 111 is determined such that the outer peripheral edge 111A of the extension portion 111 has a convex and gently curved mountain shape.

[0129] When the extending portion 111 is formed, marks, characters, etc. indicating the container 501 corresponding to the lid body 100 can be arranged on the extending portion 111. For example, characters such as S, M, and L are arranged on the extending portion 111 by printing or the like. Then, when the size of the container 501 is small, the lid body 100 with the character S printed thereon is used. When the size of the container 501 is medium, the lid body 100 with the character M printed thereon is used. When the size of the container 501 is large, the lid body 100 with the character L printed thereon is used, so that the types of the container 501 and the lid body 100 are associated with each other. Thereby, when the lid body 100 is joined to the container 501, it is possible to suppress the risk of joining the container 501 and the lid body 100 in a wrong combination of different sizes.

[0130] In the lid body 100 of the sixth example, as shown in FIG. 16B, it may have the opening forming portion 120 as shown in the lid body 100 of the third example. In that case, the extending portion 111 may be formed on the outer peripheral edge of the base portion 102 (the outer peripheral edge of the outer region corresponding portion 105C). FIG. 16B is a plan view schematically showing an embodiment of the lid body 100 according to the sixth example (an example in which the extending portion 111 is further formed with respect to an example of the lid body 100 according to the third example). In the example of FIG. 16B, the position of the extending portion 111 is defined on the outer peripheral edge of the outer region corresponding portion 105C such that the tip side (the front edge portion 175 side) of the small lid portion 103 is located between the extending portion 111 and the hinge portion 104 in the closed lid state. Also, in this case, it is preferable that a weakening portion 114 is formed as a connection structure at the boundary position between the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106. In FIG. 16B, a continuous portion 115 is arranged at a position close to the extending portion 111 in the weakening portion 114, and a through portion 110 is formed from the hinge portion 104 toward the continuous portion 115 along the boundary position between the outer peripheral edge 103A of the small lid portion 103 and the opening edge 106A of the small opening 106.

[0131] In this case, while grasping the extending portion 111, by pulling up the extending portion 111 so as to tear the outer region corresponding portion 105C from the outer peripheral edge of the outer region corresponding portion 105C (the base end of the extending portion 111) toward the lid region corresponding portion 105B including the joining region corresponding portion 105A, the extending portion 111 can be connected to the small lid portion 103 via the continuous portion 115. Then, when the extending portion 111 is further pulled up, the small lid portion 103 can be pulled up about the hinge portion 104 together with the extending portion 111 along the through portion 110 forming the boundary between the small lid portion 103 and the small opening 106. In this case, the extending portion 111 can function as the above-described gripping portion 121 and can exhibit the function of pulling up the small lid portion 103.

[0132] In the first to sixth examples of the lid body described above, in the state of the container 500 with a lid body to be described later, the lid body 100 is joined to the container 501 to form a joint portion 651. The joint portion 651 is a portion where the container 501 and the lid body 100 are adhered to each other (including adhesion), and in order to separate the lid body 100 from the container 501, the lid body 100 and the container 501 are peeled off at the joint portion 651. The lid body 100 using the paper-based material 10 is not limited to such a configuration, and as described in the description of the seventh to ninth examples of the lid body below, a lid body 201 fitted to the container 501 may be applied as a lid body using the paper-based material 10.

[0133] Each lid body (lid bodies of the seventh to ninth examples) described in the seventh to ninth examples of the lid body has a top lid portion 202 and a side wall portion 203 as will be described later, and at least the top lid portion 202 is formed using the paper-based material 10 according to the present invention. The description of each lid body of the seventh to ninth examples will be continued with reference to the drawings.

[0134] [3-7 Seventh Example of Lid Body] [3-7-1 Configuration] As illustrated in FIGS. 18A and 18B, the lid body 201 according to the present invention has a top lid portion 202 and a side wall portion 203 (the seventh example). This example is referred to as the seventh example (the seventh example of the lid body). As will be described later with reference to FIG. 24 and the like, the lid body 201 according to the seventh example is formed so as to be capable of contacting a container having an opening 502 formed at the upper end and an edge portion 503 serving as an upper edge portion forming the outer periphery of the opening 502. Regarding the state in which the lid body 201 and the container 501 are in contact with each other, the lid body 201 is formed so as to be fitted into a container having an opening 502 formed at the upper end and an edge portion 503 serving as an upper edge portion forming the outer periphery of the opening 502. FIG. 18A is a perspective view schematically showing an embodiment of the lid body according to the seventh example. FIG. 18B is a cross-sectional view schematically showing an embodiment of the lid body according to the seventh example. Note that FIG. 18B shows the state of the longitudinal cross-section taken along line I-I of FIG. 18A. FIG. 24 is a cross-sectional view showing an example of a container 500 with a lid body in which the lid body 201 shown in FIGS. 18A and 18B is joined to the container 501.

[0135] As shown in the examples of FIGS. 18A and 18B, the lid body 201 preferably has a bent portion 204. The bent portion 204 is a portion connecting the top lid portion 202 and the side wall portion 203. In the examples of FIGS. 18A and 18B, the bent portion 204 and the side wall portion 203 are continuously (integrally) formed.

[0136] (Top lid portion) As shown in FIG. 24, when the lid body 201 is attached (mounted) to the container 501, the top lid portion 202 becomes a portion covering the opening 502 of the container 501. The shape of the top lid portion 202 may be determined according to the shape of the container 501, and examples thereof include a circular shape, an elliptical shape, a triangular shape, a rectangular shape, a polygonal shape, and a chamfered shape.

[0137] (Bent portion) The bent portion 204 is formed so as to surround the outer peripheral edge of the lid portion 202, and is a portion that forms the boundary between the lid portion 202 and the side wall portion 203. The bent portion 204 is formed such that when the lid body 201 is attached to the container 501, the side wall portion 203 faces the side wall 504 and the edge portion 503 of the container 501. In the examples of FIGS. 18A to 18B, the bent portion 204 has a bent structure, but as will be described later, the bent portion 204 is not limited to having a bent structure. Further, the "portion that forms the boundary between the lid portion 202 and the side wall portion 203" includes both the case where the portion itself forms the boundary and the case where the boundary is defined inside or at the end of the portion (when a part of the lid portion 202 and / or the side wall portion 203 also serves as the bent portion 204). The boundary between the lid portion 202 and the side wall portion 203 is defined at the center of the bent portion 204. When the bent portion 204 has a curved structure (for example, FIGS. 23A to 23B showing an embodiment of Modification 4 of the 7th example of the lid body to be described later), the bent portion 204 is composed of a portion specified within the curved range, and the boundary between the lid portion 202 and the side wall portion 203 is defined approximately at the center of the bent portion 204.

[0138] (Side wall portion) The side wall portion 203 is formed in an annular shape along the outer peripheral end of the lid portion 202.

[0139] The lid body 201 according to the 7th example can be obtained by integrally molding the blank material 250 for forming the lid body 201 to integrally form the lid portion 202, the bent portion 204, the side wall portion 203, and the lid portion 202.

[0140] (Blank material) In the lid body 201 according to the 5th embodiment, the blank material 250 may be formed in the same manner as the blank material 130 shown in the description of the 1st example of the lid body or the like. That is, the blank material 250 is formed from the paper-based material 10.

[0141] (Contact portion) The lid body 201 has a contact portion 274 that contacts the container 501 in a state of being fitted to the container 501. The contact portion 274 is formed at a predetermined portion (the first contact portion 274A) of the side wall portion 203. Further, as shown in FIG. 18B, the contact portion 274 is preferably formed at a portion (the second contact portion 274B) corresponding to a predetermined region on the opposite surface 273 side of the top lid portion 202. When the lid body 201 is fitted to the container 501, the formation of the contact portion 274 can suppress the possibility of the contents of the container 501 leaking to the outside. The first contact portion 274A is preferably formed over substantially the entire outer peripheral end of the edge portion 503 of the container, and is preferably formed in an annular shape. The second contact portion 274B is preferably formed over substantially the entire upper end of the edge portion 503 of the container, and is preferably formed in an annular shape. The first contact portion 274A and the second contact portion 274B may be separated from each other or may be connected. The same applies to the contact portion 274 (including the first contact portion 274A and the second contact portion 274B) shown in the fifth embodiment, as well as the eighth and ninth examples described later.

[0142] Also, in the examples of FIGS. 18A and 18B, a through portion 210 is formed at a predetermined position of the top lid portion 202. An insertion port 219 is formed as the through portion 210. The through portion 210 is formed by a cut portion 208. In the example of FIG. 18, the cut portion 208 is a cross-shaped cut. The insertion port 219 and the through portion 210 may be formed in the same manner as the insertion port 119 and the through portion 110 described in the second example of the lid body. The through portion 210 is a portion that penetrates the top lid portion 202 from the exposed surface 272 to the opposite surface 273.

[0143] [3-7-2 Action and Effect] Regarding the lid body, it is important to use a paper material from the perspective of reducing environmental load. On the other hand, there has been a demand to improve water resistance. In this regard, according to the seventh example, by applying the paper-based material 10 described above to the lid body, it is possible to obtain a lid body that has water resistance while using a paper material.

[0144] [3-7-3 Modification Example] (Modification Example 1 of the Seventh Example of the Cover) In the cover 201 according to the seventh example, as shown in FIGS. 21A and 21B, etc., the top cover portion 202 and the side wall portion 203 may be formed of separate members (Modification Example 1 of the seventh example). Modification Example 1 of the seventh example includes cases where a part of the member forming the top cover portion 202 forms a part of the side wall portion 203, and cases where a part of the member forming the side wall portion 203 forms a part of the top cover portion 202. FIGS. 21A and 21B show an example of the case where a part of the member forming the top cover portion 202 forms a part of the side wall portion 203.

[0145] A method of forming the cover 201 of Modification Example 1 of the seventh example shown in FIGS. 21A and 21B, etc. will be described. For example, a top cover portion forming member 222 having a first portion 231 for forming the top cover portion 202 as shown in FIGS. 22A and 22B, and a side wall portion forming member 223 for forming the side wall portion 203 are prepared. A joint margin 230 configured to be joinable to the side wall portion forming member 223 is extended as a second portion 232 at the outer end portion (outer edge end portion) of the first portion 231 of the top cover portion forming member 222. By adhering the joint margin 230 of the top cover portion forming member 222 to the upper end portion of the side wall portion forming member 223, the top cover portion forming member 222 and the side wall portion forming member 223 are joined to form the bent portion 204. At this time, the cover 201 is formed. In this case, as shown in FIGS. 22A and 22B, etc., blank materials for forming the top cover portion forming member 222 and the side wall portion forming member 223 (referred to as the first blank material 251 and the second blank material 252, respectively) can be used as the blank material. As the first blank material 251 for forming the top cover portion forming member 222, a sheet material formed in a shape in which the joint margin 230 is adjusted to the shape of the top cover portion 202 as shown in FIG. 22A may be used. The second blank material 252 has a shape corresponding to the shape of the side wall portion 203. For example, when the side wall portion 203 has a shape in which the diameter decreases or increases toward the tip, a sheet material formed in a fan shape (formed in a partial fan shape) as shown in FIG. 22B may be used. By joining the edge portions 253, 253 at both ends of the second blank material 252, the side wall portion forming member 223 for forming the side wall portion 203 can be obtained.

[0146] In the first modification example of the seventh example, at least one blank material selected from the group consisting of the first blank material 251 and the second blank material 252 may be formed in the same manner (using the same material) as the above-described blank material 130. That is, at least one blank material selected from the group consisting of the first blank material 251 and the second blank material 252 is formed of the paper-based material 10. In the examples of FIGS. 21A, 21B, 22A, and 22B, the paper-based material 10 is applied to the first blank material 251 and the second blank material 252.

[0147] (Second modification example of the seventh example of the lid body) In the examples of FIGS. 18A and 18B, the side wall portion 203 is formed so as to taper downward (toward the -Z direction) (the inner diameter of the cross section decreases (the diameter contracts)), but this is a preferred example, and the side wall portion 203 may be formed so as to thicken downward (the inner diameter of the cross section increases (the diameter expands)). Also, the side wall portion 203 may be formed so as not to thicken or taper downward (the inner diameter of the cross section is constant), and the side wall portion 203 may be formed so as to have a portion that thickens or tapers downward (a portion where the inner diameter of the cross section changes) (the second modification example of the seventh example). What is shown in the second modification example of the seventh example is the same for the eighth example to the ninth example described later. Note that the cross section shows a cut surface of the side wall portion when assuming a state where the side wall portion is cut by a plane having the vertical direction as the normal line. The inner diameter of the cross section indicates the diameter on the inner peripheral surface side when the cut surface (cross section) is generally annular.

[0148] (Third modification example of the seventh example of the lid body) The top cover portion 202 of the lid body 201 according to the seventh example may further have the configuration as described in the second to sixth examples (Modification Example 3 of the seventh example). Therefore, for example, in Modification Example 3 of the seventh example, the top cover portion 202 may have a configuration corresponding to the opening forming portion 120. Also, the lid body 201 according to the seventh example is not prohibited from being provided with configurations corresponding to the respective modification examples shown in the first to sixth examples. In the lid body 201 according to Modification Example 3 of the seventh example, the configuration of the insertion port 219 may be omitted. The same applies to the eighth to ninth examples described later as shown in Modification Example 3 of the seventh example.

[0149] (Modification Example 4 of the Seventh Example of the Lid Body) In the lid body 201 according to the seventh example, as shown in FIGS. 23A to 23B, the bent portion 204 may be constituted by the protruding portion 226. Also, a convex portion 225 may be formed at an end portion (inner end portion 228A, outer end portion 228B) of the protruding portion 226 closer to the side wall portion 203 or in the vicinity thereof.

[0150] (Protruding Portion) In an example of the lid body 201 according to Modification Example 4 of the seventh example shown in FIGS. 23A to 23B, the protruding portion 226 is formed as a structure (protruding structure) in which a predetermined region on the outer peripheral end side of the top cover portion 202 protrudes obliquely upward. However, the protruding direction of the protruding portion 226 may be upward or in the horizontal direction (the plane direction of the top cover portion 202). Also, the inner surface 226A side of the protruding portion 226 is a sunken portion (sunken portion 227). The shape of the sunken portion 227 corresponds to the shape of the protruding portion 226. This can be realized according to the shape of the mold when forming the lid body 201 from the blank material 250. The size of the sunken portion 227 is preferably such that the edge portion 503 of the container 501 can be fitted. When the size of the sunken portion 227 is such, when the lid body 201 is used as the container 500 with the lid body, the edge portion 503 generally enters the sunken portion 227, and the outer end portion of the edge portion 503 (the outer peripheral surface portion 511 of the edge portion 503 in the examples of FIGS. 23A and 23B) can be brought into surface contact with the sunken portion 227, and it becomes easy to firmly attach the lid body 201 to the edge portion 503 of the container 501.

[0151] (Convex portion) As shown in the example of FIGS. 23A to 23B, a convex portion 225 may be formed on the side wall portion 203. The convex portion 225 is defined, for example, as a portion protruding in the inner direction (the center CT direction, the direction from the outer peripheral surface 203B to the inner peripheral surface 203A of the side wall portion 203) at a predetermined position of the side wall portion 203. The convex portion 225 is preferably a rib portion formed in a strip shape so as to go around the inner peripheral surface of the side wall portion 203. A convex structure of the convex portion 225 is formed on the inner peripheral surface side of the side wall portion 203, and a concave portion 224 may be formed at a position corresponding to the position where the convex structure is formed on the outer peripheral surface 203B side of the side wall portion 203. By forming such a structure, the shape of the side wall portion 203 can be made more stable.

[0152] [3-8 Eighth example of the lid body] [3-8-1 Configuration] The lid body 201 according to the eighth example is the same as the seventh example of the lid body in that it has a top lid portion 202 and a side wall portion 203 and can be fitted to the container 501, as shown in FIGS. 19A and 19B. FIG. 19A is a perspective view schematically showing an embodiment of the lid body according to the eighth example. FIG. 19B is a cross-sectional view schematically showing an embodiment of the lid body according to the eighth example. Note that FIG. 19B shows the state of the longitudinal section along the line J-J in FIG. 19A. The lid body 201 according to the eighth example has a configuration in which a part of the side wall portion 203 extends above and below the top lid portion 202. The side wall portion 203 has an annular (including cylindrical) shape and has an upper wall 205 and a lower wall 206. The lower wall 206 is a portion extending below the top lid portion 202, and the upper wall 205 is constituted by a portion of the side wall portion 203 excluding the lower wall 206. In the examples of FIGS. 19A and 19B, the side wall portion 203 is formed to taper downward. Also, in the examples of FIGS. 19A and 19B, a through portion 210 is formed at a predetermined position of the top lid portion 202, but this is just an example.

[0153] (Members forming the top lid portion and the side wall portion respectively) In the eighth example of the lid body, as shown in Modification 1 of the seventh example of the lid body, the top cover portion 202 and the side wall portion 203 are formed of separate members. In the examples of FIGS. 19A and 19B, the lid body 201 has a top cover portion forming member 222 and a side wall portion forming member 223 as the above-described separate members, and has a joint portion for joining the top cover portion forming member 222 and the side wall portion forming member 223.

[0154] (Top cover portion forming member) The top cover portion forming member 222 has a first portion (the first portion 231 of the top cover portion forming member 222) corresponding to the top cover portion 202 and a second portion (the second portion 232 of the top cover portion forming member 222) extending from the outer peripheral end of the first portion 231. The second portion 232 is the joint substitute 230 shown in Modification 1 of the fifth embodiment. In the example of FIG. 19A, the second portion 232 of the top cover portion forming member 222 is a portion (rising portion) that rises obliquely upward or straight upward from the outer peripheral end of the first portion 231 in the state of the lid body 201, and the second portion 232 becomes a part of the side wall portion 203 in the state where the second portion 232 is joined to the side wall portion forming member 223.

[0155] (Side wall portion forming member) The side wall portion forming member 223 is formed in an annular shape (including a cylindrical shape) and has a portion (upper forming portion) forming the upper wall 205 and a portion (lower forming portion) forming the lower wall 206. The upper forming portion has a portion (first contact wall portion 233) that contacts at least the outer surface side with respect to the joint substitute 230 that becomes the second portion 232 of the top cover portion forming member 222.

[0156] In the examples of FIGS. 19A and 19B, the upper wall 205 (upper forming portion) has a first contact wall portion 233, a portion (second contact wall portion 234) that contacts the joining margin 230 which is the second portion 232 of the canopy forming member 222 on the inner surface side, and a continuous portion 235 that connects the first contact wall portion 233 and the second contact wall portion 234. The continuous portion 235 covers the upper end surface of the joining margin 230 which is the second portion of the canopy forming member 222. The lower end of the second contact wall portion 234 is located on the upper surface side of the first portion 231 of the canopy forming member 222 and is slightly separated from the first portion 231 in the examples of FIGS. 19A and 19B. However, this is just an example, and the lower end of the second contact wall portion 234 may contact the upper surface side of the first portion 231 of the canopy forming member 222.

[0157] In the examples of FIGS. 19A and 19B, the lower wall 206 (lower forming portion) is a portion that extends downward (diagonally downward in FIGS. 19A and 19B) with the lower end of the first contact wall portion 233 as the base end. The lower wall 206 (lower forming portion) is preferably located, for example, below the lower surface of the first portion 231 of the canopy forming member 222 in terms of the vertical position.

[0158] (Blank material) The lid body 201 according to the eighth example can be formed by processing a blank material. As the blank material, a blank material for forming the canopy forming member 222 and the side wall forming member 223 (referred to as the first blank material and the second blank material respectively as described above in Modification 1 of the seventh example of the lid body) can be used. At least one blank material selected from the group consisting of the first blank material and the second blank material is applied with the paper-based material 10 in the same manner as the blank material 130 described above in Modification 1 of the seventh example of the lid body.

[0159] 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 first modification example of the seventh example of the lid body, and a sheet material formed in a shape that further matches the joining margin 230 to the shape of the canopy portion 202 (for example, the same as that shown in FIG. 22A) may be used. The canopy portion forming member 222 preferably forms a first portion 231 corresponding to the canopy portion 202 and a rising portion (a second portion 232 serving as a joining margin) by bending and forming the first blank material. That is, the second portion 232 is preferably formed by bending the first blank material upward at the position of the periphery of the first portion 231 (the base end of the joining margin 230).

[0160] 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 first modification example of the seventh example of the lid body, and a sheet material formed in a fan shape (for example, the same as that shown in FIG. 22B) may be used. By joining the edge portions of the second blank material to form an annular body and folding back the upper end side portion of the annular body inward at a position corresponding to the continuous portion 235, the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235 can be formed, and an upper portion forming portion (a structural portion corresponding to the upper wall 205) can be formed, and further a lower portion forming portion (a structural portion corresponding to the lower wall 206) can be formed. By forming the upper portion forming portion and the lower portion forming portion, the side wall portion forming member 223 is formed. Note that at least the first contact wall portion 233 and the second contact wall portion 234 are adhered to the joining margin 230. In the example of FIG. 19B, the first contact wall portion 233, the second contact wall portion 234, and the continuous portion 235 are adhered to the joining margin 230 to form an adhesive portion.

[0161] In the manufacture of the lid body 201, it is preferable to join the above-described annular body formed from the second blank material to the top cover forming member 222. For example, the lower end of the joining margin 230 (second portion 232) of the top cover 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, which is the boundary between the lower forming portion and the upper forming portion, and the joining margin 230 is faced to the inner peripheral surface of the annular body. Further, by folding back the upper end side portion of the annular body at a position corresponding to the continuous portion 235 in the annular body as described above, the joining margin 230 is covered from the upper end side. Then, the joining 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. Thereby, the side wall forming member 223 is formed and the lid body 201 is obtained.

[0162] [3-8-2 Action and Effect] According to the lid body 201 according to the eighth example, the same effects as those of the seventh example of the lid body can be obtained.

[0163] [3-9 Ninth Example of Lid Body] [3-9-1 Configuration] The lid body 201 according to the ninth example is the same as the seventh example of the lid body in that it has a top cover portion 202 and a side wall portion 203 and can be fitted to a container, as shown in FIGS. 20A and 20B. FIG. 20A is a perspective view schematically showing an embodiment of the lid body according to the ninth example. FIG. 20B is a cross-sectional view schematically showing an embodiment of the lid body according to the ninth example. Note that FIG. 20B shows the state of the longitudinal cross-section taken along the line K-K of FIG. 20A. The lid body 201 according to the ninth example has a configuration in which a part of the side wall portion 203 extends above and below the top cover portion 202. The side wall portion 203 has an annular (including cylindrical) shape and has an upper wall 205 and a lower wall 206. The lower wall 206 is a portion that extends below the top cover portion 202, and the upper wall 205 is constituted by a portion of the side wall portion 203 excluding the lower wall 206. In the examples of FIGS. 20A and 20B, the side wall portion 203 is formed to taper downward. Also, in the examples of FIGS. 20A and 20B, a through-hole 210 is formed at a predetermined position of the top cover portion 202, but this is just an example.

[0164] (Members forming the top cover part and the side wall part respectively) In the ninth example of the lid body, as also shown in the first modification of the seventh example of the lid body and the description of the eighth example of the lid body, the top cover part 202 and the side wall part 203 are formed of separate members. The lid body 201 shown in the examples of FIGS. 20A and 20B has a top cover part forming member 222 and a side wall part forming member 223 as the above-mentioned separate members, and has a joint part for joining the top cover part forming member 222 and the side wall part forming member 223.

[0165] (Top cover part forming member) The top cover part forming member 222 has a first part (the first part 231 of the top cover part forming member 222) corresponding to the top cover part 202, and a second part (the second part 232 of the top cover part forming member 222) extending from the outer peripheral end of the first part 231. The second part 232 is the joint margin 230 shown in the first modification of the fifth embodiment. In the examples of FIGS. 20A and 20B, the second part of the top cover part forming member 222 is a part (hanging part) extending obliquely downward or directly downward from the outer peripheral end of the first part 231, and in a state where the second part 232 is joined to the side wall part forming member 223, the second part 232 forms a part of the side wall part 203.

[0166] (Side wall part forming member) The side wall part forming member 223 is formed in an annular shape (including a cylindrical shape), and has a part (upper forming part) forming the upper wall 205 and a part (lower forming part) forming the lower wall 206. The lower forming part has a part (lower first contact wall part 237) that contacts at least the outer surface side with respect to the joint margin 230 that becomes the second part 232 of the top cover part forming member 222.

[0167] In the examples of FIGS. 20A and 20B, the lower forming portion has a lower first contact wall portion 237, a portion (lower second contact wall portion 238) that contacts the joint margin 230 which is the second portion 232 of the lid portion forming member 222 on the inner surface side, and a lower end side continuous portion 239 that connects the lower first contact wall portion 237 and the lower second contact wall portion 238. The lower end side continuous portion 239 covers the lower end surface of the joint margin 230 which is the second portion 232 of the lid portion forming member 222. The upper end of the lower second contact wall portion 238 is located on the lower surface (opposing surface 273) side of the first portion 231 of the lid portion forming member 222, and in the examples of FIGS. 20A and 20B, it is preferably separated from the first portion 231. It is preferable that an edge portion 503 of the container 501 (for example, a part of the outer peripheral surface of the curled portion 508) can enter between the first portion 231 and the upper end of the lower second contact wall portion 238.

[0168] In the examples of FIGS. 20A and 20B, the upper wall 205 (upper forming portion) is a portion that extends upward (diagonally upward in FIG. 20B) with the upper end of the lower first contact wall portion 237 as the base end. For example, it is preferable that the upper wall 205 (upper forming portion) is located above the upper surface of the first portion 231 of the lid portion forming member 222 in terms of the vertical position. As shown in the examples of FIGS. 20A and 20B, it is preferable that a curled portion (side wall upper end curled portion 236) is formed at the upper end side of the upper forming portion. In this case, it is possible to suppress the formation of a state where the end face of the blank material (second blank material for forming the side wall portion forming member 223) is exposed at the upper end of the upper forming portion. Even when the user licks the end face of the blank material to ingest the contents in the container 501, it is possible to suppress the discomfort associated with the user's mouth coming into contact with the end face of the blank material. Also, due to the formation of the side wall upper end curled portion 236, it becomes difficult for the liquid to contact the portion corresponding to the end face of the blank material in the side wall portion 203.

[0169] (blank material) The lid body 201 according to the ninth example can be formed by processing a blank material. As the blank material, a blank material for forming the top cover 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 first modification of the seventh example of the lid body) can be used. At least one blank material selected from the group consisting of the first blank material and the second blank material is applied with the paper-based material 10 in the same manner as the blank material 130 described above in the first modification of the seventh example of the lid body.

[0170] As the first blank material for forming the top cover portion forming member 222, the same one as the first blank material 251 described above in the first modification of the seventh example of the lid body may be used, and a sheet material formed in a shape in which the joining margin 230 is further combined with the shape of the top cover portion 202 (for example, as shown in FIG. 22A) may be used. The top cover portion forming member 222 is preferably formed by bending the first blank material to form a first portion 231 corresponding to the top cover portion 202 and a second portion 232 that becomes the joining margin 230. That is, the second portion 232 is preferably formed by bending the first blank material downward at the position of the periphery of the first portion 231.

[0171] As the second blank material for forming the side wall portion forming member 223, the same one as the second blank material 252 described above in the first modification of the seventh example of the lid body may be used, and a sheet material formed in a fan shape (for example, as shown in FIG. 22B) may be used. By joining the edge portions of the second blank material to form an annular body, and folding back the lower end side portion of the annular body inward at a position corresponding to the lower end side continuous portion 239, the lower first contact wall portion 237, the lower second contact wall portion 238, and the lower end side continuous portion 239 can be formed, and at the same time, the lower forming portion (lower wall 206) can be formed, and further the upper forming portion (upper wall 205) can be formed. By forming the lower forming portion and the upper forming portion, the side wall portion forming member 223 is formed.

[0172] In the manufacture of the lid body 201, it is preferable that the above-described annular body formed from the second blank material is joined to the top cover portion forming member 222. The upper end of the joining margin 230 (second portion 232) of the top cover portion 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, which is the boundary between the lower forming portion and the upper forming portion, and the joining margin 230 is faced to the inner peripheral surface of the annular body. Further, by folding back the lower end side portion of the annular body at a position corresponding to the lower end side continuous portion 239 in the annular body as described above, the joining margin 230 is covered from the lower end side. Then, the joining margin 230 is joined (adhered) to the lower forming portion (the annular body forming the side wall portion forming member 223) so as to be sandwiched between the lower first contact wall portion 237 and the lower second contact wall portion 238. Thereby, the side wall portion forming member 223 is formed and the lid body 201 is obtained.

[0173] [3-9-2 Actions and effects] According to the lid body 201 according to the ninth example, the same effects as those of the seventh example of the lid body can be obtained.

[0174] The description of the application examples of the lid body will be continued.

[0175] [4 Application examples] (Application example 1) As shown in Examples 1 to 6 of the above-described lid body, the lid body 100 can be used for the container 500 with a lid as shown in FIGS. 17A and 17B (Application example 1). FIG. 17A is a perspective view showing an example in which the lid body 100 according to the first example is joined to an edge portion 503 forming the outer periphery of an opening portion 502 of a container 501 having an opening portion 502 formed at the upper end. FIG. 17B is a cross-sectional view schematically showing the state of the vertical cross-section taken along line H-H of FIG. 17A. The container 500 with a lid will be described with reference to FIGS. 17A and 17B.

[0176] (Container with a lid) As the container 500 with a lid, an example in which the lid 100 according to the first example is attached to the container 501 will be described. In the container 500 with a lid, a contact portion is formed by attaching the container 501 to the lid 100. In Application Example 1, a joint portion 651 formed by joining the lid 100 to the container 501 is formed as the contact portion, and the region of the lid 100 that forms the joint portion 651 becomes the joint region R. The joining method between the lid 100 and the container 501 is not particularly limited, and it can be appropriately used in combination with joining methods such as a crimping method or a heat fusion method (heat seal).

[0177] In the example shown in FIGS. 17A and 17B, the container 501 has a cylindrical side wall 504 that becomes thicker upward (tapers downward) and a bottom portion 507, and a container body 510 that forms a space portion 505 inside, and an opening 502 that opens at the upper end of the container body 510 (the upper end of the side wall 504). Although not shown, the opening 502 of the container 501 is formed in a circular shape. However, the container 501 shown here is an example and does not limit the configuration of the container 501. For example, the container 501 may have the opening 502 formed in a rectangular shape. The container 501 only needs to be able to be covered by the lid 100 at the opening 502. Also, what is stored inside the container 501 (space portion 505) is not particularly limited, and examples thereof include, for example, liquid substances, solid substances, or combinations thereof.

[0178] In the container shown in FIGS. 17A and 17B, the edge portion 503 of the opening 502 has a flange portion. The flange portion may be a curled portion 508 formed by winding the member forming the container body 510 outward as shown in FIGS. 17A and 17B, or may be formed as a portion (flange portion) that extends in a plane in the outer direction.

[0179] Also, the lid 100 may be combined with the container 501 having the opening 502.

[0180] (Application Example 2) As shown in the seventh to ninth examples of the lid, the lid 201 can be used for the container 500 with a lid as shown in Fig. 24 (Application Example 2). Fig. 24 is a cross-sectional view showing an example in which the lid 100 according to the seventh example is fitted to the edge 503 forming the outer periphery of the opening 502 of the container 501 having an opening 502 formed at the upper end. The container 500 with a lid according to Application Example 2 will be further described with reference to Fig. 24.

[0181] The lid 201 can be attached to the container 501 by fitting the lid 201 to the edge 503 that forms the outer periphery of the opening 502 of the container 501 having an opening 502 formed at the upper end. In this case, a contact portion can be formed as the portion where the container 501 and the lid 201 are in contact (the edge 503 and the portion of the top lid 202 are in contact). Note that the configuration of the container 501 may be the same as the container described above in Application Example 1, so a detailed description thereof is omitted.

[0182] Also, the lid 201 may be combined with the container 501 having the opening 502.

[0183] What is shown in the above [4 Application Examples] is not limited to the case of using the lid 100 according to the first example. The lids according to the second to sixth examples, the lids according to the eighth and ninth examples, and each modification shown in the description of the first to ninth examples can also be used for the container 500 with a lid, and can also be used as a combination of the lid 100 and the container 501 (not shown).

[0184] The paper-based material 10 according to the present invention will be further described using specific examples.

Example

[0185] Example 1 (Preparation of Materials) Beeswax was prepared as a hydrophobic organic compound, water was prepared as a diffusion liquid, and beeswax was diffused in water at a blending amount of 0.8% by weight (in this case, dispersed). The 0.8% by weight aqueous dispersion of beeswax thus obtained was used as the immersion liquid. Also, paper (basis weight 140 g / m2) was prepared as the base material.

[0186] (Manufacture of paper-based material) A paper (basis weight: 140 g / m2) as a substrate was immersed in the above-described immersion liquid. At this time, the substrate and the immersion liquid were used in a ratio such that the immersion liquid was 100 parts by weight with respect to 100 parts by weight of the substrate. The immersed substrate was dried. Thereby, a sheet was obtained as a paper-based material.

[0187] (Manufacture of lid) From the obtained paper-based material, a blank material was manufactured by cutting out a circular portion with a diameter of 90 mm. This blank material was used as the lid as it was.

[0188] (Heat sealability of lid) As a container, a container (the mouth of the opening has an outer diameter of 90 mm and has a flange portion at the edge) formed from polyethylene-coated paper (a material in which polyethylene layers (resin coating layers) are formed on both surfaces of a paper-based material (belonging to so-called coated paper)) was prepared.

[0189] The lid was placed so that the flange portion and the opening of the container were hidden. Then, a heat sealing method was applied by pressurizing and heating from the exposed surface side of the lid. The heating temperature was set at 175°C. Thereby, a container with a lid was obtained.

[0190] A peel test between the container and the lid was performed using the obtained container with a lid. The peel test was carried out by observing the separation state when the lid was separated from the container with a lid. As a result, it was observed that material failure occurred in the lid when separating the lid from the container, and thus it was confirmed that the heat sealability was good.

[0191] In addition, for the obtained lid, a water resistance test was performed by dropping water on the side facing the container and observing the soaking property. Note that a water resistance test similar to that of the lid formed from the paper-based material obtained in Example 1 was also performed on the substrate. In the lid of Example 1, it was observed that the soaking of water was suppressed in the case of the substrate, and it was excellent in water resistance.

[0192] As described above, the paper-based material and the lid and the like using the paper-based material according to the present invention have been described in detail. However, what has been described above is merely an example of the paper-based material and the lid according to the present invention, and is not limited thereto. Therefore, it may be appropriately changed without departing from the gist of the present invention.

[0193] Based on the description of the above specification, the present invention may adopt the configurations shown in the following [E1] to [E9]. [E1] On at least one surface of a paper-based base material It is formed from a paper-based material exposing the surface of the base material, It has an opening formed at the upper end and an edge forming the outer periphery of the opening and is formed to be joinable to a container having a resin coating layer on the surface, The resin coating layer is configured to be able to be joined to the portion of the paper-based material where the surface of the base material is exposed, Lid [E2] In the paper-based material, A surface attachment portion as a portion to which a non-synthetic resin-based hydrophobic organic compound is attached is provided on at least one surface of the base material. the above [E1] Lid described in. [E3] The hydrophobic organic compound is a biodegradable organic compound. The above [E2] to described Lid [E4] An inner attachment portion as a portion to which the hydrophobic organic compound is attached is formed from the surface of the base material to an inner portion of the base material. The above [E2] or [E3] to described Lid [E5] The surface attachment portion forms a layer. Any one of the above [E2] from [E4] described Lid [E6] An inner attachment portion as a portion to which the hydrophobic organic compound is attached is formed from the surface of the base material to an inner portion of the base material, and the inner attachment portion and the surface attachment portion are continuous. Any one of the above [E2] from [E5] described Lid [E7] The non-synthetic resin-based hydrophobic organic compound is waxes. Any one of the above [E2]from Any one of [E6] Lid [E8] A lid as described in any one of [E1] to [E7], and a container having an opening formed at the upper end and an edge portion forming the outer periphery of the opening. The container has a resin coating layer on the surface, The lid is joined to the container and the resin coating layer is joined to the portion of the paper-based material where the surface of the base material is exposed, Container with lid. [E9] A lid as described in any one of [E1] to [E7], and a container having an opening formed at the upper end and an edge portion forming the outer periphery of the opening. and has a resin coating layer on the surface And a container having and the resin coating layer is formed so as to be able to be joined to the portion of the paper-based material where the surface of the base material is exposed, Combination of lid and container.

Explanation of reference numerals

[0194] 10: Paper-based material 11: Base material 11A: Surface 11A1: One side 11A2: The other side 11B: Inner part 12: Fiber sheet 12A: Fiber 13: Surface adhesion part 14: Inner adhesion part 15: Layered part 16: Non-formation part 17: Structural part 100: Lid 102: Base part 103: Small lid part 103A: Outer periphery 104: Hinge part 105A: Joint region corresponding part 105B: Lid region corresponding part 105C: Outer region corresponding part 106: Small opening 106A: Opening edge 108: Notch part 110: Through part 111: Extension part 111A: Outer periphery 114: Weakening part 115: Continuous part 116: Half-cut part 117: Connection structure 119: Insertion port 120: Opening formation part 121: Knob part 122: Tab member 122A: One end part 122B: The other end part 123: Tab joint part 124: Claw part 125: Receiving part 130: Blank material 143: Protrusion 144: Recess 145: Depression part 146: Protruding part 150: Label part 150A: Base end 150B: Outer peripheral edge 151: Display part 152: Contents identification part 172: Exposed surface 173: Opposite surface 174: Base end part 175: Front edge part 195: Outer peripheral edge 201: Cover body 202: Top cover part 203: Side wall part 203A: Inner peripheral surface 203B: Outer peripheral surface 204: Bent part 205: Upper wall 206: Lower wall 208: Notch part 210: Through part 219: Insertion port 222: Top cover part forming member 223: Side wall part forming member 224: Recess 225: Protrusion 226: Overhanging part 226A: Inner surface 227: Immersion part 228A: Inner end part 228B: Outer end part 230: Bonding generation 231: First part 232: Second part 233: First contact wall part 234: Second contact wall part 235: Continuous part 236: Side wall upper end curl part 237: Lower first contact wall part 238: Lower second contact wall part 239: Lower end side continuous part 250: Blank material 251: First blank material 252: Second blank material 253: Edge part 272: Exposed surface 273: Opposite surface 274: Contact part 274A: First contact part 274B: Second contact part 300: Container with lid 500: Container with lid 501: Container 502: Opening 503: Edge 504: Side wall 505: Space part 507: Bottom 508: Curl part 510: Container body 511: Outer peripheral surface 651: Joint part CT: Center NB1: Protrusion start position NB2: Protrusion start position R: Bonding region

Claims

Claim 1: A lid formed from a paper-based material formed on at least one surface of a paper-based substrate having a plurality of fibers, with the surface of the substrate exposed, wherein the surface has a portion formed such that the fibers are exposed, and is configured to be joinable to a container having an opening formed at an upper end and an edge portion forming the outer periphery of the opening and having a resin coating layer on the surface, and the resin coating layer can be joined to at least a part of the portion of the paper-based material where the fibers on the surface of the substrate are formed to be exposed. A lid. Claim 2: The lid according to claim 1, wherein the paper-based material is provided, on at least one surface of the substrate, with a surface adhesion portion as a portion to which a non-synthetic resin-based hydrophobic organic compound is adhered. Claim 3: The lid according to claim 2, wherein the hydrophobic organic compound is a biodegradable organic compound. A lid according to claim 2. Claim 4: An inner adhesion portion as a portion to which the hydrophobic organic compound is adhered is formed from the surface of the substrate to an inner portion of the substrate. A lid according to claim 2. Claim 5: The lid according to claim 2, wherein the surface adhesion portion forms a layer. A lid according to claim 2. Claim 6: An inner adhesion portion as a portion to which the hydrophobic organic compound is adhered is formed from the surface of the substrate to an inner portion of the substrate, and the inner adhesion portion and the surface adhesion portion are continuous. A lid according to claim 2. Claim 7: The lid according to claim 2, wherein the non-synthetic resin-based hydrophobic organic compound is waxes. A lid according to claim 2. Claim 8: An inner adhesion portion as a portion to which the hydrophobic organic compound is adhered is formed from the surface of the substrate to an inner portion of the substrate. A lid according to claim 3. Claim 9: The surface adhesion portion forms a layer. A lid according to claim 3. Claim 10: An inner adhesion portion as a portion to which the hydrophobic organic compound is adhered is formed from the surface of the substrate to an inner portion of the substrate, and the inner adhesion portion and the surface adhesion portion are continuous. A lid according to claim 3. Claim 11: The non-synthetic resin-based hydrophobic organic compound is waxes. A lid according to claim 3. Claim 12: The lid according to any one of claims 1 to 11, and a container having an opening formed at an upper end and an edge portion forming the outer periphery of the opening, wherein the container has a resin coating layer on the surface, and the lid is joined to the container. The resin coating layer is joined to a portion of the surface of the base material of the paper-based material that is exposed. A container with a lid.

13. The lid according to any one of claims 1 to 11, A container having an opening formed at the upper end and an edge portion forming the outer periphery of the opening, and having a resin coating layer on the surface. The resin coating layer is formed so as to be capable of being joined to a portion of the surface of the base material of the paper-based material that is exposed. A combination of a lid and a container.

Images