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

Abstract

Provided are a lid body containing a paper-based material and having both water resistance and heat sealability, a container with a lid body, and a combination of a lid body and a container.　This lid body is used for being joined to a container that has an opening portion and an edge portion forming the outer periphery of the opening portion, at the position of the edge portion. The lid body comprises: a base material sheet that has a facing surface that corresponds to the surface on the side facing the container, and an exposed surface that corresponds to the surface on the back surface side of the facing surface, and that includes a paper-based material; and a water-repellent layer that includes a non-synthetic resin-based hydrophobic organic compound. When viewed in the thickness direction of the base material sheet, a joint region-corresponding portion that serves as a portion to be joined to the edge portion, and a lid region-corresponding portion that serves as a portion inward of the inner edge portion of the joint region-corresponding portion, are formed. The water-repellent layer is provided at least on the facing surface side relative to the base material sheet in the lid region-corresponding portion. A sheet-exposing region in which the base material sheet is exposed is formed in at least a partial region of a surface of the joint region-corresponding portion that forms the facing surface.

Description

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

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

[0002] Some lids are attached to the rim of a container containing a liquid, such as a coffee drink or a carbonated beverage, by heat sealing while covering the opening. As disclosed in Patent Document 1, plastic lids have been widely used for such lids due to their cost and moldability. The environmental impact of plastics has become a problem. In particular, conventional plastics, such as petroleum-based synthetic resins (hereinafter sometimes referred to as "synthetic plastics"), have been recognized as having the problem of not naturally decomposing after disposal and remaining in nature for long periods of time. To address this issue, the use of biodegradable plastics as lid materials has been considered. However, while biodegradable plastics are more biodegradable than synthetic plastics, there is a strong demand for cost improvements. In light of these issues, it is desirable to use paper-based materials (non-plastic materials) as lid materials, which have a lower environmental impact than plastics.

[0003] Japanese Patent Application Laid-Open No. 2021-84646

[0004] When a paper-based material is used as the lid, further improvement in the water resistance of the lid is required. For example, if a liquid contained in a container adheres to the lid, the liquid adhering to the lid may penetrate into the lid, potentially reducing the rigidity of the lid. To improve water resistance, it is conceivable to form a synthetic plastic layer on the surface of the lid. However, forming a synthetic plastic layer again raises the issue of environmental impact. Therefore, it is conceivable to form a layer containing a water-repellent compound with a lower molecular weight than the synthetic plastic on the surface of the lid. However, a layer containing a water-repellent compound would cause problems in terms of reducing the adhesiveness (heat sealability) between the container and the lid upon heat sealing.

[0005] One object of the present invention is to provide a lid, a container with a lid, and a combination of a lid and a container that contains a paper-based material and has both water resistance and heat sealability.

[0006] The present invention is summarized as follows: (1) to (11).

[0007] (1) A lid used to be attached to a container having an opening and a rim that forms an outer periphery of the opening at the position of the rim, the lid having an opposing surface corresponding to the surface facing the container and an exposed surface corresponding to the surface behind the opposing surface, the lid comprising: a base sheet including a paper-based material; and a water-repellent layer including a non-synthetic resin-based hydrophobic organic compound, wherein, when the thickness direction of the base sheet is the line of sight, a bonding area corresponding to the portion that is bonded to the rim and a lid area corresponding to the portion extending inward from the inner edge of the bonding area corresponding to the corresponding edge are formed, the water-repellent layer is provided on at least the lid area corresponding to the opposing surface side of the base sheet, and an exposed area that exposes the base sheet is formed on at least a portion of the bonding area corresponding to the surface that forms the opposing surface. (2) The lid according to (1), wherein the water-repellent layer is further provided on the lid area corresponding to the exposed surface side of the base sheet. (3) The lid body according to (2) above, wherein the water-repellent layer provided on the opposing surface side of the lid region corresponding portion is a first water-repellent layer, the water-repellent layer provided on the exposed surface side of the lid region corresponding portion is a second water-repellent layer, and when the thickness direction of the base sheet is the line of sight, a region where the first water-repellent layer is formed and a region where the second water-repellent layer is formed overlap. (4) The lid body according to (1) or (2) above, wherein the sheet exposed region is further formed in at least a portion of the surface of the bonding region corresponding portion that forms the exposed surface. (5) The lid body according to (4) above, wherein the sheet exposed region provided on the opposing surface side of the bonding region corresponding portion is a first sheet exposed region, and the sheet exposed region provided on the exposed surface side of the bonding region corresponding portion is a second sheet exposed region, and when the thickness direction of the base sheet is the line of sight, the first sheet exposed region and the second sheet exposed region overlap. (6) The cover according to (1), wherein the sheet exposed area is formed on the entire surface of the bonding area corresponding portion that forms the opposing surface side. (7) The cover according to (1), wherein the water-repellent layer has a continuous surface forming portion and a discontinuous surface forming portion, and the discontinuous surface forming portion is formed outside the continuous surface forming portion in a plan view of the base sheet.(8) The lid according to (1), wherein, when the portion outward from the outer periphery of the lid region corresponding portion is defined as the outer region corresponding portion, the outer region corresponding portion is formed outward from the outer periphery of the bonding region corresponding portion, and the water-repellent layer is further provided on a portion of the outer region corresponding portion outward from the position of the outer periphery of the bonding region corresponding portion and closer to the exposed surface than the base sheet. (9) The lid according to (1), wherein, when the portion outward from the outer periphery of the lid region corresponding portion is defined as the outer region corresponding portion, the outer region corresponding portion is formed outward from the outer periphery of the bonding region corresponding portion, and the water-repellent layer is further provided on a portion of the outer region corresponding portion outward from the position of the outer periphery of the bonding region corresponding portion and closer to the facing surface than the base sheet. (10) The lid according to (1), wherein the water-repellent layer contains a thickener. (11) The lid according to (1), wherein the hydrophobic organic compound is a wax. (12) The lid according to (1) above, wherein the hydrophobic organic compound is biodegradable. (13) The lid according to (1) above, wherein the base sheet is formed of a material that avoids petroleum-based synthetic resins. (14) The lid according to (1) above, wherein the water-repellent layer is a coating film formed on the surface of the base sheet. (15) A container with a lid, comprising the lid according to (1) above and the container having the opening and the edge that forms the outer periphery of the opening, and wherein the lid is joined to the container. (16) A combination of a lid and a container, comprising the lid according to (1) above and the container having the opening and the edge that forms the outer periphery of the opening.

[0008] According to the present invention, it is possible to provide a lid, a container with a lid, and a combination of a lid and a container that contain a paper-based material and have both water resistance and heat sealability.

[0009] FIG. 1A is a plan view schematically showing an example of a lid according to the first embodiment. FIG. 1B is a bottom view schematically showing an example of a lid according to the first embodiment. FIG. 1C is a cross-sectional view schematically showing a vertical cross section taken along line A-A in FIG. 1A. FIGS. 2A to 2D are cross-sectional views schematically showing another example of a lid according to the first embodiment. FIG. 3A is a plan view schematically showing an example of a lid according to Modifications 3 and 4 of the first embodiment. FIG. 3B is a bottom view schematically showing an example of a lid according to Modifications 3 and 4 of the first embodiment. FIG. 3C is a cross-sectional view schematically showing a vertical cross section taken along line B-B in FIG. 3A. FIG. 4A is a plan view schematically showing an example of a lid according to Modifications 3 and 4 of the first embodiment. FIG. 4B is a bottom view schematically showing an example of a lid according to Modifications 3 and 4 of the first embodiment. FIG. 4C is a cross-sectional view schematically showing a vertical cross section taken along line C-C in FIG. 4A. FIG. 5A is a plan view schematically showing an example of a lid according to Modification 5 of the first embodiment. FIG. 5B is a bottom view schematically showing an example of a lid according to Modification 5 of the first embodiment. FIG. 5C is a cross-sectional view schematically showing a vertical cross section taken along line D-D in FIG. 5A. FIG. 6A is a plan view schematically showing an example of a lid according to Modification 6 of the first embodiment. FIG. 6B is a bottom view schematically showing an example of a lid according to Modification 6 of the first embodiment. FIG. 6C is a cross-sectional view schematically showing a vertical cross section taken along line E-E in FIG. 6A. FIG. 7A is a plan view schematically showing an example of a lid according to the first embodiment. FIG. 7B is a bottom view schematically showing an example of a lid according to the first embodiment. FIG. 7C is a cross-sectional view schematically showing a vertical cross section taken along line F-F in FIG. 7A. FIG. 8A is a plan view schematically showing an example of a lid according to the first embodiment. Fig. 8B is a bottom view schematically showing an example of a lid according to the first embodiment. Fig. 8C is a cross-sectional view schematically showing a state of a vertical cross section taken along line G-G in Fig. 8A. Fig. 9A is a plan view schematically showing an example of a lid according to the second embodiment. Fig. 9B is a bottom view schematically showing an example of a lid according to the second embodiment. Fig. 9C is a cross-sectional view schematically showing a state of a vertical cross section taken along line H-H in Fig. 9A. Fig. 10A is a plan view schematically showing an example of a lid according to a modified example of the second embodiment.FIG. 10B is a bottom view schematically showing an example of a lid according to a modified example of the second embodiment. FIG. 10C is a cross-sectional view schematically showing a state of a vertical section taken along line I-I in FIG. 10A. FIG. 11 is a cross-sectional view schematically showing another example of a lid according to a modified example of the second embodiment. FIG. 12A is a plan view schematically showing an example of a lid according to the third embodiment. FIG. 12B is a bottom view schematically showing an example of a lid according to the third embodiment. FIG. 12C is a cross-sectional view schematically showing a state of a vertical section taken along line J-J in FIG. 12A. FIG. 13A is a plan view schematically showing an example of a lid according to a modified example 1 of the third embodiment. FIG. 13B is a cross-sectional view schematically showing a state of a vertical section taken along line K-K in FIG. 13A. FIG. 13C is a cross-sectional view schematically showing an example of a lid according to a modified example 1 of the third embodiment in a state in which the small lid portion is lifted. FIG. 14A is a plan view schematically showing an example of a lid according to Modification 2 of the third embodiment. FIG. 14B is a cross-sectional view schematically showing a state of a vertical cross section taken along line L-L in FIG. 14A. FIG. 14C is a cross-sectional view schematically showing an example of a lid according to Modification 2 of the third embodiment in a state in which the small lid portion is lifted. FIG. 15A is a plan view showing an example of a container with a lid. FIG. 15B is a cross-sectional view schematically showing a state of a vertical cross section taken along line M-M in FIG. 17A. FIGS. 16A and 16B are partially enlarged cross-sectional views for explaining the state of the joint between the lid and the container.

[0010] The lid according to the present invention will be described in detail below with reference to the drawings. The lid is used to be attached to a container (cup) such as a coffee cup for holding a liquid, such as a beverage. However, the container may also hold solids in addition to a liquid. That is, containers to which the lid according to the present invention can be attached include those that hold solids in addition to a liquid. The lid according to the present invention will be described below using an example of a lid that has a circular shape when viewed from above. However, the shape of the lid is not limited to a circular shape when viewed from above, and various shapes other than a circle, such as an ellipse, a polygonal shape such as a rectangle or a triangle, a chamfered rectangle, or a chamfered polygon, can also be used.

[0011] The following describes the lid and application examples of the lid related to the present invention, with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and redundant description will be omitted.

[0012] The following description is a preferred example of the present invention, and the content of the present invention is not limited to these embodiments. Furthermore, in the following description, directions such as front-to-back, left-to-right, and up-down, as well as directions on a horizontal plane, are shown for the sake of convenience, but the content of the present invention is not limited to these directions. In the examples of FIGS. 1 to 16 , the Z-axis direction is the up-down direction (the upper side is the +Z direction, the lower side is the −Z direction), the X-axis direction is the front-to-back direction (the rear side is the +X direction, the front side is the −X direction), the directions along the X-axis and Y-axis, which are perpendicular to each other and defined on a plane normal to the Z-axis direction, are the X-axis and Y-axis directions, and the XY plane, which is the plane defined by the X-axis and Y-axis, is the horizontal plane. The description will be based on these. The relative magnitude ratios of sizes and other characteristics shown in each of FIGS. 1 to 16 are shown for convenience and, unless otherwise specified, do not limit the actual magnitude ratios.

[0013] [1. Lid] The lid of the present invention will be described in order from the first embodiment to the third embodiment.

[0014] [1-1 First Embodiment] [1-1-1 Configuration of Lid] As shown in Figures 15A, 15B, etc., the lid 1 according to the first embodiment is used to be joined to a container 101 having an opening 102 and an edge 103 that forms the upper edge of the outer periphery of the opening 102, and is formed in a shape that can be joined to the container 101. That is, as shown in Figures 15A, 15B, etc., the lid 1 can be used as a lidded container 150 by being joined along the edge 103. Figures 15A and 15B are perspective and cross-sectional views showing an example of a lidded container 150 in which the lid 1 shown in Figures 1A and 1B is attached to the container 101. In the example of Figure 15A, the container 101 has an opening 102 at the upper end in the vertical direction. It is more preferable to use a container 101 in which the edge 103 of the opening 102 is flexible. However, this does not prohibit the container 101 from being a container with little or no flexibility, such as a metal container. Also, the container 101 has a resin layer of synthetic resin or the like formed on at least the surface of the rim 103. Such a container 101 is made of the same material as a general paper coffee cup or the like.

[0015] (Bonding Region) The lid 1 according to the first embodiment has a bonding region R. In the lid 1, the region that is bonded to the edge portion 103 in a plan view of the lid 1 is called the bonding region R. In Figures 1A and 1B, the region corresponding to the bonding region R is the region on the opposing surface 73 side of the hatched portion. Figures 1A and 1B are a plan view and a bottom view, respectively, that schematically show one example of the lid 1 according to the first embodiment.

[0016] In the example of FIGS. 1A and 1B, the bonding region R corresponds to a region formed in a substantially annular shape along the opening 102 of the container 101 in a shape that corresponds to the opening 102 .

[0017] The lid body 1 according to the first embodiment has a joining region corresponding portion 5A and a lid region corresponding portion 5B as shown in Figures 1A, 1B, and 1C. Figure 1C is a cross-sectional view schematically showing the state of a vertical cross section taken along line A-A in Figure 1A.

[0018] (Joining Area Corresponding Portion) When the line of sight is the thickness direction of the base sheet 3 (thickness direction of the lid 1) described below, the joining area corresponding to the area of ​​the lid 1 that is joined to the container 101 along the edge 103 of the container 101. That is, the joining area corresponding to the area of ​​the lid 1 that corresponds to the joining area R (the area facing the edge 103 of the container 101 and that is joined to the container 101). In the case of a lid-equipped container 150, the joining area corresponding to the area of ​​the lid 1 that forms the joining area 151 between the lid 1 and the container 101. Specifically, in a plan view of the lid 1 (when the line of sight is the Z-axis direction (up and down direction) in the example of FIG. 1A ), the portion that forms the joining area R is defined as the joining area corresponding to the area of ​​the lid 1. The joining area corresponding to the area 5A is usually formed in a ring shape as shown in FIG. 1A . In particular, as shown in FIG. 1A , when the edge 103 of the container 101 is formed in a generally annular shape, the bonding region R is annular, and the bonding region corresponding portion 5A is also generally annular in a planar view of the lid 1. The outer edge of the bonding region corresponding portion 5A is determined according to the position of the outer edge of the bonding region R. The outer edge of the bonding region corresponding portion 5A may be located on the outer peripheral edge of the lid 1, or may be located inside the outer peripheral edge of the lid 1 as shown in the example of FIG. 1A . When the bonding region R between the lid 1 and the container 101 is not formed continuously, the portion sandwiched between adjacent bonding regions R and facing the edge 103 is also included in the bonding region corresponding portion 5A described below. The lid 1 has a base sheet 3, as described below. The planar view of the lid 1 shows the thickness direction of the lid 1 as the line of sight, and shows the same state as the planar view of the base sheet 3.

[0019] (Lid region corresponding portion) When the thickness direction of the base sheet 3 is the line of sight, the lid region corresponding portion 5B is the portion of the lid 1 that is inward from the inner edge (inner peripheral edge 76) of the joint region corresponding portion 5A. The outer peripheral edge (outer peripheral edge 74) of the lid region corresponding portion 5B is common to the inner edge (inner peripheral edge 76) of the joint region corresponding portion 5A. The lid region corresponding portion 5B is the portion that covers the opening 102 in the lid-equipped container 150. The lid-equipped container 150 includes cases where a small opening or a continuous portion, as described below, is formed in the portion of the lid 1 that covers the opening 102.

[0020] (Outer Region Corresponding Portion) As shown in the example of FIG. 1A , the portion of the lid body 1 extending outward from the outer peripheral edge of the lid region corresponding portion 5B is referred to as the outer region corresponding portion 5C. In this example, the outer region corresponding portion 5C is formed outward from the outer edge (outer peripheral edge 77) of the joint region corresponding portion 5A, but this is just an example. As will be described later, in FIGS. 1A , 1B , etc., the portion of the outer region corresponding portion 5C extending outward from the position of the outer peripheral edge 77 of the joint region corresponding portion 5A is referred to as the outer edge corresponding portion 5D. In FIGS. 1A , 1B , etc., reference numeral 75 denotes the outer peripheral edge of the outer region corresponding portion 5C.

[0021] (Opposing surface and exposed surface) When the lid 1 is joined to the edge portion 103 in a state where it is arranged so as to cover the opening 102 of the container 101, the lid 1 has an opposing surface 73 which is a surface facing the container 101, and an exposed surface 72 which is a surface facing outward and on the back side of the opposing surface 73. The opposing surface 73 corresponds to the surface facing the container 101, and the exposed surface 72 corresponds to the surface on the back side of the opposing surface 73.

[0022] The lid 1 has a base sheet 3 and a water-repellent layer 4 .

[0023] (Base Sheet) The base sheet 3 is a sheet material that constitutes the main body and forms the shape and structure of the lid body 1. The base sheet 3 is a sheet that contains paper-based fibers (hereinafter simply referred to as a fiber-containing sheet).

[0024] (Fiber-Containing Sheet) The fiber-containing sheet 2 that becomes the base sheet 3 is a sheet material formed using a paper-based material. Examples of the fiber-containing sheet 2 include so-called paper obtained by performing a papermaking process (papermaking process) in which a slurry of a fiber raw material (pulp-based fiber raw material) is spread onto a screen and dried or pressed to dry the resulting material; so-called air-laid sheets obtained by pulverizing a raw material sheet made of pulp-based fibers or the like in a pulverizer, stacking opened fiber raw materials such as pulverized pulp using an air flow, and fixing the fibers of the stacked body with a binder; and so-called papers produced by agglutinating plant fibers and other fibers. The fiber-containing sheet 2 also includes sheets having a laminated structure in which multiple sheets of the above-mentioned paper are stacked.

[0025] Although the fiber-containing sheet 2 is not prohibited from containing fibers other than pulp, such as metal fibers and glass fibers, in addition to the paper-based material, it is formed from materials that avoid petroleum-based synthetic resins (so-called plastics). It is preferable that the fiber-containing sheet 2 be made primarily of paper-based fibers. The term "primary component" refers to a component whose mass ratio to the total mass is 50% by mass or more.

[0026] (Paper-based material) Paper-based materials may be made only of pulp, or may contain fibers such as non-pulp natural fibers, synthetic fibers, or recycled fibers. However, it is preferable for the paper-based material to contain 50% by mass or more of pulp, more preferably 70% by mass or more, and even more preferably 80% by mass or more, and it is particularly preferable for the paper-based material to be made of 100% by mass of pulp.

[0027] In addition to the above-mentioned fibers, the paper-based material can also be a composite material with wood-based materials such as wood foil, or even aluminum foil. Even when the paper-based material is a composite material containing fibers and materials other than fibers, it is preferable that the composite material as a whole contains 50% by mass or more of pulp, and particularly preferably contains 80% by mass or more of pulp. The higher the pulp content, the more easily the paper-based material is biodegraded, which is preferable.

[0028] (Water-Repellent Layer) The lid 1 has the water-repellent layer 4 on at least one side of the base sheet 3 as described above.

[0029] (Material of Water-Repellent Layer) The water-repellent layer 4 is a layer containing a non-synthetic resin-based hydrophobic organic compound. The water-repellent layer 4 may be composed of a layer made of a hydrophobic organic compound, or may have a structure in which a portion made of a hydrophobic organic compound also contains a portion made of a material different from the hydrophobic organic compound.

[0030] (Hydrophobic Organic Compounds) Hydrophobic organic compounds are non-synthetic resin-based compounds. Non-synthetic resin-based hydrophobic organic compounds are defined as hydrophobic organic compounds excluding petroleum-based synthetic resins. Petroleum-based synthetic resins refer to resins whose carbon source is petroleum. Therefore, non-synthetic resin-based hydrophobic organic compounds may be resins whose carbon source is not petroleum, such as plants, for example, plant-based compounds. From the perspective of reducing environmental impact, it is preferable that the hydrophobic organic compound is biodegradable. Therefore, the hydrophobic organic compound may be a compound such as a plant-based biodegradable resin. Non-synthetic resin-based hydrophobic organic compounds are preferably hydrophobic organic compounds having a molecular weight of about 10,000 or less, and biodegradable organic compounds are particularly preferred. Examples of hydrophobic organic compounds having a molecular weight of about 10,000 or less include waxes.

[0031] Examples of waxes include paraffin wax having a molecular weight of about 300 to 550, microcrystalline wax, slack wax, montan wax, ceresin, ozokerite, beeswax, Japan wax, privet wax, shellac wax, carnauba wax, candelilla wax, rice wax, rose wax, sunflower seed wax, polyethylene wax, polypropylene wax, functional wax, and Fischer-Tropsch wax, with biodegradable waxes being preferred.

[0032] (Materials (Additives) Different from Hydrophobic Organic Compounds) When the water-repellent layer 4 has a portion composed of a material different from the hydrophobic organic compound, examples of the material different from the hydrophobic organic compound include additives such as thickeners and inorganic salts. An example of a thickener is xanthan gum. An example of an inorganic salt is sodium chloride. The thickener facilitates optimizing the yield strength of the hydrophobic organic compound in the coating film-forming composition used to form the water-repellent layer 4 using a printing method. Suitable inorganic salts can function as dispersion aids that facilitate optimizing the dispersibility of the hydrophobic organic compound in the coating film-forming composition. In the water-repellent layer 4, such additives may be in a state where they are not mixed (not miscible) with the organic compound layer but are precipitated in a separate state within the water-repellent layer 4 (e.g., aggregated portions of the additive are embedded within the water-repellent layer 4).

[0033] (Position of Water-Repellent Layer) The water-repellent layer is provided on at least the lid region corresponding portion 5B closer to the opposing surface 73 than the base sheet 3. In the example of FIG. 1 , the water-repellent layer 4 is formed on the surface of the base sheet 3. Examples of cases in which the water-repellent layer 4 is provided on at least the opposing surface 73 side of the lid region corresponding portion 5B include cases in which the water-repellent layer 4 is formed on substantially the entire area of ​​the lid region corresponding portion 5B ( FIG. 1 ) and cases in which the water-repellent layer 4 is formed on only a portion of the lid region corresponding portion 5B ( FIG. 2A ). Examples of cases in which the water-repellent layer 4 is formed on substantially the entire area of ​​the lid region corresponding portion 5B on the opposing surface 73 side include cases in which the water-repellent layer 4 is formed so as to cover the entire surface of the lid region corresponding portion 5B on the opposing surface 73 side, and cases in which the water-repellent layer 4 is formed on the area of ​​the lid region corresponding portion 5B on the opposing surface 73 side, excluding the outer peripheral edge 74 of the lid region corresponding portion 5B and the corresponding area nearby. The water-repellent layer 4 is preferably formed on the entire surface of the lid region corresponding portion 5B on the opposing surface 73 side. In addition, when the water-repellent layer 4 is formed on the surface of the base sheet 3, the components that form the water-repellent layer 4 may penetrate into at least a part of the base sheet 3.

[0034] The water-repellent layer 4 may be formed partially up to the bonding region corresponding portion 5A, or partially inward beyond the outer peripheral edge 74 of the lid region corresponding portion 5B (FIGS. 8A to 8C). However, even when the water-repellent layer 4 is formed as shown in FIGS. 8A to 8C, it is preferable that at least a portion of the sheet exposed region SE (described later) be formed continuously along the direction of extension of the bonding region corresponding portion 5A. As shown in the example of FIG. 8B, the sheet exposed region SE is preferably formed in an annular shape. In this case, the risk of a significant decrease in the bonding strength in some areas can be reduced when the lid 1 and the container 101 are heat-sealed.

[0035] The thickness of the water-repellent layer 4 may be partially thinner. In this case, it is preferable that the portion near the outer peripheral edge of the water-repellent layer 4 is the first thick portion 9, and the inside of the first thick portion 9 is the second thick portion 10 (FIGS. 7A to 7C). The thickness of the first thick portion 9 is thinner than that of the second thick portion 10. This can be achieved, for example, by changing the number of times the composition is applied when the water-repellent layer 4 is formed by applying the composition for forming the water-repellent layer 4 multiple times to the surface of the substrate sheet 3 to overlap the coating film partially or entirely. The number of times the composition is applied to the first thick portion 9 is less than that to the second thick portion 10. Note that this is just one example, and the method for forming the first thick portion 9 and the second thick portion 10 is not limited to this.

[0036] (Continuous surface forming portion and discontinuous surface forming portion) In the lid body 1 of the present invention shown in the examples of Figures 1B and 1C, the water-repellent layer 4 is formed by a continuous surface forming portion 6. The continuous surface forming portion 6 indicates the portion where the structure of the water-repellent layer 4 is a continuous surface in a plan view of the lid body 1. A continuous surface state indicates a state in which the water-repellent layer 4 extends in the surface direction of the lid body 1. The continuous surface forming portion 6 indicates a layered structural portion made up of components of a composition for forming the water-repellent layer 4 (a coating film-forming composition in the manufacturing method described below), and includes not only a layer in which each component of the composition is uniformly dispersed, but also a structure in which separated portions of the components of the composition are scattered within the layer.

[0037] The first embodiment is not limited to the examples shown in Figures 1A to 1C, and as will be described later with reference to Figures 2C and 2D, the water-repellent layer 4 may have a continuous surface forming portion 6 and a discontinuous surface forming portion 7. The discontinuous surface forming portion 7 refers to a portion in which, in a plan view of the lid 1, portions made of a hydrophobic organic compound and portions made of a material other than the hydrophobic organic compound (these portions are collectively referred to as attachment portions 8) are dispersedly formed (a state in which structural portions forming the water-repellent layer 4 are distributed on the surface of the base sheet 3). The discontinuous surface forming portion 7 is defined as a portion in which a large number of attachment portions 8 are dispersedly formed and the base sheet 3 is exposed between at least some of the adjacent attachment portions 8.

[0038] (Sheet Exposed Region) In the lid 1, a sheet exposed region SE exposing the base sheet 3 is formed in at least a partial region of the surface of the bonding region corresponding portion 5A that forms the opposing surface 73. In the example of Figures 1A to 1C, the sheet exposed region SE is formed in the entire surface of the bonding region corresponding portion 5A that forms the opposing surface 73. In this case, the base sheet 3 is exposed across the entire bonding region R.

[0039] 2A , the sheet exposed area SE may be formed up to a predetermined area on the lid area corresponding portion 5B side of the junction area corresponding portion 5A, as long as it is formed in at least a part of the area on the opposing surface 73 side of the joining area corresponding portion 5A. In this case, the water-repellent layer 4 is formed on the surface of the lid area corresponding portion 5B on the opposing surface 73 side, inside the outer peripheral edge 74.

[0040] When the discontinuous surface forming portion 7 is formed on the water-repellent layer 4, the region between adjacent attachment portions 8 on the surface of the base sheet 3 may be formed as an exposed sheet region SE. For example, the exposed sheet region SE formed in the region between adjacent attachment portions 8 may be formed inside the lid region corresponding portion 5B as shown in FIG. 2C. Furthermore, as will be described later with reference to FIG. 2D, when the boundary between the bonding region corresponding portion 5A and the lid region corresponding portion 5B is located between adjacent attachment portions, the exposed sheet region SE formed in the region between adjacent attachment portions 8 may be formed in a region straddling the boundary between the bonding region corresponding portion 5A and the lid region corresponding portion 5B. However, when the exposed sheet region SE is formed inside the lid region corresponding portion 5B as shown in FIG. 2C or 2D, from the viewpoint of further improving the water resistance of the lid body 1, it is preferable that the area of ​​the exposed sheet region SE in the region between adjacent attachment portions 8 be as small as possible. In addition, when a separate component (a different component) is attached to a specified area including the sheet exposed area SE in the area between adjacent attachment portions 8, the area of ​​the sheet exposed area SE in the area between adjacent attachment portions 8 may be determined according to the area required for attaching the different component.

[0041] (State of the exposed surface) In the description of the first embodiment, the configuration of the exposed surface 72 side of the lid 1 is not particularly limited, and a printed layer forming a design may be formed thereon, or a hydrophilic layer may be formed thereon (not shown). The surface of the lid 1 facing the exposed surface 72 may also form a sheet exposed area SE, as described below. In the example of FIG. 1A , the entire exposed surface 72 is the sheet exposed area SE. However, this is just one example, and the state of the surface of the lid 1 facing the exposed surface 72 is not limited to the case where the entire surface is the sheet exposed area SE.

[0042] [1-1-2 Manufacturing Method] An example of a manufacturing method for the lid 1 will be described. A composition (coating film-forming composition) is prepared by adding a material for forming the water-repellent layer 4 to a non-aqueous solvent. A fiber-containing sheet 2 is prepared, and the coating film-forming composition is applied to a predetermined area of ​​the fiber-containing sheet 2 to form a coating film (coating step). The coating film is then dried (drying step). At this time, the water-repellent layer 4 is formed as a coating film in a predetermined layout. The fiber-containing sheet 2 is then punched out into a shape corresponding to the lid 1. The punching positions are specified according to the layout of the coating film (layout of the water-repellent layer 4). This forms a blank material that constitutes the lid 1. This blank material may be used as the lid 1, or tabs, etc., described below, may be provided as needed. The tabs, etc. may be arranged before the fiber-containing sheet 2 is punched out into a shape corresponding to the lid 1.

[0043] In the production method described above, the hydrophobic organic compound contained in the coating film-forming composition can be selected from those described above. The non-aqueous solvent is not particularly limited as long as it can be mixed with the hydrophobic organic compound, and examples thereof include alcohol-based solvents such as ethanol.

[0044] In the drying step, the water and non-aqueous solvent contained in the coating film may be almost completely evaporated, or some water and non-aqueous solvent may remain in the coating film.

[0045] The amount of the hydrophobic organic compound contained in the composition for forming a coating film can be determined appropriately.

[0046] The coating process is not particularly limited as long as it is a method that can form a coating film on the surface of the substrate sheet 3 using the composition for forming a coating film in a predetermined layout, and examples include printing methods such as gravure printing and screen printing.

[0047] [1-1-3 Actions and Effects] When a lid is joined to a container using a heat sealing method or the like, a resin coating layer is usually formed on the surface of the container to waterproof the container. Typically, the material of the resin coating layer is often a relatively low-polarity or non-polar resin such as polyolefin, which is often a resin that is poorly compatible with other common polar resins (e.g., polycarbonate, etc.). For this reason, there is a demand for a method that enables the container and the lid to be bonded by a heat sealing method even when the types of resins that make up the resin coating layer formed on the surface of the container are diversified.

[0048] In conventional lids using a base sheet made of a paper-based material, a resin layer made of a so-called plastic material has been formed on the surface of the base sheet to impart water resistance to the paper-based material. In such cases, 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 plastic resin layer formed on the surface of the paper-based material, even if the lid is manufactured using a paper-based material, it may be difficult to heat-seal the lid to the container.

[0049] Furthermore, paper-based materials in which a resin layer is formed on the surface of a base material using plastic as a material pose an environmental burden problem because plastic is used.

[0050] In the lid 1 according to the first embodiment of the present invention, a water-repellent layer 4 is formed on the lid region corresponding portion 5B. Therefore, when a liquid is contained in the container 101 in the lid-equipped container 150 state, even if the liquid adheres to the facing surface 73 of the lid 1, the risk of the liquid penetrating into the base sheet 3 constituting the lid 1 can be reduced, thereby improving the water resistance of a lid made of a paper-based material. Furthermore, a sheet exposed region SE is formed on the facing surface 73 side of the joining region corresponding portion 5A of the lid 1, which prevents the formation of a water-repellent layer 4 in at least a portion of the joining region R. Therefore, when the lid 1 is joined to a container 101 whose surface is coated with a resin coating layer using a heat sealing method, the heat sealability in the joining region R can be prevented from being reduced by a hydrophobic organic compound.

[0051] When the water-repellent layer 4 is formed over substantially the entire area of ​​the facing surface 73 of the lid region corresponding portion 5B, the portion near the outer edge of the water-repellent layer 4 can be in contact with the edge 103 of the container 101, as shown in FIG. 16A . When the container 101 contains liquid WT, this reduces the risk of the liquid WT penetrating the sheet-exposed area SE through the joint 151 of the lid-equipped container 150, thereby improving water resistance at the joint 151 between the container 101 and the lid 1. As shown in the example shown in FIG. 16A , it is preferable that the outer edge of the water-repellent layer 4 be slightly crushed due to the pressure applied when forming the lid-equipped container 150 using a heat-sealing method. In this case, the contact area between the portion near the outer edge of the water-repellent layer 4 and the edge 103 of the container 101 can be increased, further improving water resistance at the joint 151 between the container 101 and the lid 1. FIG. 16A is a partially enlarged view that schematically illustrates a partially enlarged state of a joint 151 and its vicinity in a lidded container 150 in which the lid 1 according to the first embodiment is attached to a container 101.

[0052] Furthermore, in the lid 1, a compound corresponding to a non-plastic, different from so-called plastics, can be suitably used as the hydrophobic organic compound forming the water-repellent layer 4. In this specification, plastic generally refers to a polymer of compounds, such as synthetic resins, that is a high-molecular-weight compound. The molecular weight of the hydrophobic organic compound forming the water-repellent layer 4 is somewhat smaller than that of the high-molecular-weight compounds that constitute general plastics. As described above, a compound with a molecular weight of approximately 10,000 or less is suitably used as the hydrophobic organic compound. It is considered that hydrophobic organic compounds can be classified as non-plastics, different from general plastics. Note that the molecular weight values ​​shown for hydrophobic compounds are merely examples. Even compounds with a molecular weight exceeding 10,000 can be classified as hydrophobic organic compounds as long as they do not satisfy the conditions for a high-molecular-weight compound and a polymer, unlike general plastics.

[0053] In this way, the lid body 1 can be formed from a non-plastic material, which can improve both the heat sealing properties and water resistance of the container 101, and is also effective in reducing environmental impact.

[0054] A modification of the first embodiment will be described.

[0055] [1-1-4 Modifications] (Modification 1) In the lid body 1 according to the first embodiment, the water-repellent layer 4 may be formed not only on the lid region corresponding portion 5B but also on a portion of the joining region corresponding portion 5A, as shown in FIG. 2B . This configuration is referred to as Modification 1 of the first embodiment. In the example of the lid body 1 according to Modification 1 of the first embodiment, the portion of the water-repellent layer 4 formed on the lid region corresponding portion 5B may be a portion of the lid region corresponding portion 5B, or may be formed on the entire lid region corresponding portion 5B. When the formation region of the water-repellent layer 4 is a portion of the lid region corresponding portion 5B, if the region of the lid region corresponding portion 5B excluding the formation region of the water-repellent layer 4 is designated as a non-formation region, it becomes easy to join another member to the non-formation region using a heat sealing method or the like.

[0056] Furthermore, in Modification 1 of the first embodiment, the water-repellent layer 4 is preferably formed along the inner peripheral edge of the bonding region corresponding portion 5A (the outer peripheral edge of the lid region corresponding portion 5B) to a position slightly inside the bonding region corresponding portion 5A (a position closer to the inner edge than the center of the bonding region corresponding portion 5A). In this case, the water-repellent layer 4 is formed to a position slightly inside the bonding region R. When a pressing force is applied when pressing the lid body 1 against the container 101 to heat-seal the lid body 1 to the container 101, the end of the water-repellent layer 4 is likely to come into contact with the inner edge of the rim portion 103 of the container 101. Furthermore, the pressing force crushes the water-repellent layer 4 against the rim portion 103, making it easier to form a state in which the water-repellent layer 4 fills the gap between the inner edge of the rim portion 103 and the base sheet. In this case, it is possible to effectively prevent liquid contained in the container 101 from entering the sheet exposed region SE from the position of the inner edge of the rim portion 103. In the first modification of the first embodiment, the portion of the water-repellent layer 4 located in the bonding area corresponding portion 5A forms part of a bonding portion 151 that bonds the lid 1 to the container 101. However, the bonding strength of the bonding portion 151 between the water-repellent layer 4 and the container 101 is smaller than the bonding strength of the bonding portion 151 between the base sheet 3 and the container 101 in the sheet exposed area SE.

[0057] (Variation 2) In the lid body 1 according to the first embodiment, when the water-repellent layer 4 has a continuous surface-forming portion 6 and a discontinuous surface-forming portion 7, the water-repellent layer 4 may be formed such that the discontinuous surface-forming portion 7 is disposed outside the continuous surface-forming portion 6 in a plan view of the base sheet 3 (in a plan view of the lid body 1), as shown in FIG. 2D . This configuration of the present invention is referred to as Variation 2 of the first embodiment. FIG. 2D is a cross-sectional view showing an example of the lid body 1 according to Variation 2 of the first embodiment. In the example of the lid body 1 according to Variation 2 of the first embodiment, when the lid body 1 is placed on the edge portion 103 of the container 101 so as to cover the opening 102 of the container 101 in order to heat-seal the lid body 1 to the container 101, even if there is some misalignment between the lid body 1 and the container 101, it is difficult to form a state in which the continuous surface-forming portion 6 of the lid body 1 is disposed directly above the edge portion 103, thereby reducing the risk of it being difficult to heat-seal the lid body 1 and the container 101 with sufficient adhesive strength.

[0058] 2D , the configuration shown in Modification 1 of the first embodiment is preferably provided. In the lid 1 according to Modification 2 of the first embodiment, the portion of the water-repellent layer 4 formed in the bonded region corresponding portion 5A is preferably a discontinuous surface forming portion 7. In this case, the sheet exposed region SE formed between the attached portion 8 constituting the discontinuous surface forming portion 7 and the adjacent attached portion 8 preferably straddles the boundary between the bonded region corresponding portion 5A and the lid region corresponding portion 5B. When a pressing force is applied when pressing the lid 1 against the container 101 to heat-seal the lid 1 to the container 101, the discontinuous surface forming portion 7 of the water-repellent layer 4 is likely to come into contact with the vicinity of the inner edge of the edge portion 103 of the container 101. The pressure causes the adhered portion 8 of the discontinuous surface forming portion 7 of the water-repellent layer 4 to be crushed by the edge portion 103 and spread in the planar direction of the facing surface 73, facilitating the formation of a state in which the water-repellent layer 4 fills the space between the inner end of the edge portion 103 and the base sheet while partially leaving a sheet-exposed region SE, as shown in FIG. 16B . For ease of explanation, the portion where the sheet-exposed region SE remains is omitted from FIG. 16B . Therefore, as shown in FIG. 16B , the liquid WT contained in the container 101 can be effectively prevented from entering the sheet-exposed region SE from the inner end of the edge portion 103, further improving the water resistance at the joint 151 between the container 101 and the lid 1. Furthermore, even when the discontinuous surface forming portion 7 of the water-repellent layer 4 is crushed by the edge portion 103 and spread in the planar direction of the facing surface 73, the partial remaining portion that becomes the sheet-exposed region SE makes it less likely that the heat-sealability between the lid 1 and the container 101 will be impaired. Note that Figure 16B is a partially enlarged view that schematically shows a partially enlarged state of the joint 151 and its surrounding area in a lidded container 150 in which a lid 1 according to variant example 2 of the first embodiment is attached to a container 101.

[0059] (Variation 3) In the lid body 1 according to the first embodiment, as shown in Figures 3A to 3C, the water-repellent layer 4 may be further provided on the lid region corresponding portion 5B closer to the exposed surface 72 than the base sheet 3. This configuration in the present invention is referred to as Variation 3 of the first embodiment. Figures 3A and 3B are a plan view and a bottom view showing an example of the lid body 1 according to Variation 3 of the first embodiment. Figure 3C is a cross-sectional view schematically showing the state of the vertical cross section taken along line B-B in Figure 3A. Note that Figures 3A to 3C also serve as figures for explaining Variation 4 of the first embodiment, which will be described later.

[0060] In the example of the lid body 1 according to variant example 3 of the first embodiment, the water-repellent layer 4 provided on the exposed surface 72 side is provided so as to cover almost the entire area of ​​the exposed surface 72 of the lid area corresponding portion 5B, but this is just one example.

[0061] In the lid body 1 according to Modification 3 of the first embodiment, the water-repellent layer 4 provided on the facing surface 73 side of the lid region corresponding portion 5B is designated as the first water-repellent layer 4A, and the water-repellent layer 4 provided on the exposed surface 72 side of the lid region corresponding portion 5B is designated as the second water-repellent layer 4B. When the thickness direction of the base sheet 3 is taken as the line of sight, the area where the first water-repellent layer 4A is formed and the area where the second water-repellent layer 4B is formed may be individually defined. For example, as shown in FIGS. 4A to 4C , the area where the second water-repellent layer 4B is formed may be formed larger than the area where the first water-repellent layer 4A is formed. FIGS. 4A and 4B are plan and cross-sectional views illustrating another example of the lid body 1 according to Modification 3 of the first embodiment. FIG. 4C is a cross-sectional view schematically illustrating the state of the vertical cross section taken along line CC of FIG. 4A . Similar to the description of FIGS. 3A to 3C , FIGS. 4A to 4C also serve as figures for explaining Modification 4 of the first embodiment, which will be described later.

[0062] Furthermore, in the lid body 1 according to the third modification of the first embodiment, the area where the second water-repellent layer 4B is formed may be formed smaller than the area where the first water-repellent layer 4A is formed (not shown).

[0063] In the lid 1 according to the third modification of the first embodiment, it is preferable that the region where the first water-repellent layer 4A is formed overlaps the region where the second water-repellent layer 4B is formed. In the example shown in Figures 3A to 3C, the first water-repellent layer 4A and the second water-repellent layer 4B are both formed over substantially the entire region of the lid region corresponding portion 5B, and therefore substantially overlap. When the region where the first water-repellent layer 4A is formed overlaps the region where the second water-repellent layer 4B is formed, curling of the lid 1 itself can be more effectively suppressed when the water-repellent layer 4 is formed as a coating film on the lid 1.

[0064] The thickness of the first water-repellent layer 4A and the thickness of the second water-repellent layer 4B may be determined separately, but it is preferable that they are approximately the same thickness from the viewpoint of suppressing curling in the lid 1. The material of the first water-repellent layer 4A and the material of the second water-repellent layer 4B may be determined separately, but it is preferable that they are the same material from the viewpoint of suppressing curling in the lid 1.

[0065] (Variation 4) In the above description of the first embodiment, the configuration of the exposed surface 72 side of the lid 1 is not particularly limited, and for example, a hydrophilic layer may be formed. As described above with reference to FIG. 1 and the like, the sheet exposed area SE may be formed on the exposed surface 72. In the lid 1 according to Variation 3 of the first embodiment, the sheet exposed area SE is preferably formed on at least a portion of the surface of the bonding area corresponding portion 5A that forms the exposed surface 72, as shown in FIGS. 3A to 3C. This form of the present invention is referred to as Variation 4 of the first embodiment. In the lid 1 according to Variation 4 of the first embodiment shown in FIGS. 3A to 3C, the sheet exposed area SE formed on the exposed surface 72 side is formed to cover substantially the entire exposed surface 72 of the bonding area corresponding portion 5A, but this is just one example.

[0066] In the cover 1 according to the fourth modification of the first embodiment, when the sheet exposed area SE provided on the facing surface 73 side of the bonding area corresponding portion 5A is designated as the first sheet exposed area SE1, and the sheet exposed area SE provided on the exposed surface 72 side of the bonding area corresponding portion 5A is designated as the second sheet exposed area SE2, and when the line of sight is the thickness direction of the base sheet 3, the first sheet exposed area SE1 and the second sheet exposed area SE2 may be defined individually, but it is preferable that the first sheet exposed area SE1 and the second sheet exposed area SE2 overlap. In the example of Figures 3A to 3C, the first sheet exposed area SE1 and the second sheet exposed area SE2 are both formed over substantially the entire bonding area corresponding portion 5A and therefore substantially overlap each other. When the first sheet exposed area SE1 and the second sheet exposed area SE2 overlap, as in variant example 3, the occurrence of curvature (curl) of the lid body 1 can be more effectively suppressed when the water-repellent layer 4 is formed as a coating film on the lid body 1.

[0067] In the lid 1, as shown in Figures 4A to 4C, the second sheet exposed area SE2 may be formed so as to avoid the joint area corresponding area 5A. However, as shown in Figures 3A to 3C, it is preferable that the second sheet exposed area SE2 be formed over the entire exposed surface 72 of the joint area corresponding area 5A. In this case, since the water-repellent layer 4 is not formed in the joint area corresponding area 5A, it is possible to prevent the water-repellent layer 4 from dissolving when the lid 1 is joined to the container 101 by heat sealing, and thereby prevent a portion of the water-repellent layer 4 from being transferred to the pressing body used for heat sealing. This prevents contamination of the pressing body. The pressing body applies a pressing force to the lid 1 and the container 101.

[0068] (Variation 5) In the lid 1 according to the first embodiment, as shown in Figures 5A to 5C, the water-repellent layer 4 may further be provided on a portion (referred to as an outer edge corresponding portion 5D) of the outer region corresponding portion 5C that is outward from the outer edge (outer peripheral edge 77) of the bonding region corresponding portion 5A, and closer to the exposed surface 72 than the base sheet 3. This configuration is referred to as Variation 5 of the first embodiment. Figures 5A and 5B are a plan view and a cross-sectional view showing another example of the lid 1 according to Variation 5 of the first embodiment. Figure 5C is a cross-sectional view schematically showing the state of the vertical cross section taken along line D-D in Figure 5A.

[0069] In the fifth modification of the first embodiment, the area of ​​the portion of the water-repellent layer 4 formed on the outer edge corresponding portion 5D may be a part of the area of ​​the exposed surface 72 corresponding to the outer edge corresponding portion 5D, or may be the entire area of ​​the area of ​​the exposed surface 72 corresponding to the outer edge corresponding portion 5D. In the cover 1 according to the fifth modification of the first embodiment shown in the example of Figures 5A to 5C, the water-repellent layer 4 is formed on almost the entire area of ​​the area of ​​the exposed surface 72 corresponding to the outer edge corresponding portion 5D.

[0070] According to the lid body 1 of Modification 5 of the first embodiment, the water-repellent layer 4 is formed on at least a portion of the surface of the outer edge corresponding portion 5D on the exposed surface 72 side, thereby reducing the risk of the user experiencing a rough texture when the user sips their mouth on the outer edge of the lid body 1. For example, if a rough surface is used as the base sheet 3, and the base sheet 3 is exposed at the outer edge corresponding portion 5D of the lid body 1, the surface of the outer edge corresponding portion 5D may become rough. If a beverage such as coffee is stored in the container 101 and the lid body 1 has a small opening 56 (described below), the user's mouth may come into contact with the outer edge of the lid body 1 when drinking from the small opening 56. In such a case, a rough surface of the outer edge corresponding portion 5D may cause discomfort to the user. In this regard, according to Modification 5 of the lid body 1, the risk of the user experiencing a rough texture when the user sips their mouth on the outer edge of the lid body 1 is reduced, thereby reducing the risk of the user experiencing discomfort.

[0071] According to the lid body 1 of variant example 5, a water-repellent layer 4 is formed in the area of ​​the exposed surface 72 corresponding to the outer edge corresponding portion 5D, which makes it easy to increase the stiffness and rigidity of the outer edge portion of the lid body 1 (reducing the sagging of the base sheet).

[0072] (Variation 6) In the lid body 1 according to the first embodiment, as shown in FIGS. 6A to 6C , the water-repellent layer 4 may be further provided on the outer edge corresponding portion 5D, closer to the opposing surface 73 than the base sheet 3. This configuration is referred to as Variation 6 of the first embodiment. The outer edge corresponding portion 5D is defined in the same manner as in Variation 5 above, and therefore will not be described here. FIGS. 6A and 6B are a plan view and a cross-sectional view showing another example of the lid body 1 according to Variation 6 of the first embodiment. FIG. 6C is a cross-sectional view schematically showing the state of the vertical cross section taken along line E-E in FIG. 6A . FIGS. 6A to 6C show an example of the lid body 1 according to Variation 6 of the first embodiment, in which the configuration of Variations 3 and 5 of the first embodiment is combined with the configuration shown in Variation 6. Therefore, in FIGS. 6A to 6B , the water-repellent layer 4 is formed on the exposed surface 72 and the opposing surface 73 of the lid region corresponding portion 5B and the outer edge corresponding portion 5D. The sheet exposed area SE is formed on the exposed surface 72 and the opposing surface 73 side of the joint area corresponding portion 5A.

[0073] The portion of the water-repellent layer 4 formed on the outer region corresponding portion 5C may be a part of the area of ​​the facing surface 73 corresponding to the outer edge corresponding portion 5D, or it may be the entire area of ​​the area of ​​the facing surface 73 corresponding to the outer edge corresponding portion 5D. In the lid body 1 according to Modification 6 shown in the examples of Figures 6A to 6C, the water-repellent layer 4 is formed on almost the entire area of ​​the area of ​​the facing surface 73 corresponding to the outer edge corresponding portion 5D. With the lid body 1 according to Modification 6, the water-repellent layer 4 is formed on the area of ​​the facing surface 73 corresponding to the outer edge corresponding portion 5D, which makes it easy to increase the stiffness of the outer peripheral edge (outer peripheral edge 75) of the lid body 1.

[0074] In the lid 1 according to the sixth modification of the first embodiment shown in the example of Fig. 6, it is preferable that the portion of the water-repellent layer formed on the opposing surface of the outer edge corresponding portion and the portion of the water-repellent layer formed on the exposed surface of the outer edge corresponding portion are formed to overlap with each other, as described in the fourth modification. This can enhance the effect of suppressing the occurrence of curvature (curling) of the lid 1.

[0075] Note that the configurations described in Modifications 3 and 5 may be omitted from the lid body 1 according to Modification 6 of the first embodiment shown in the example of Fig. 6. In this case, the portion formed on the exposed surface 72 side of the lid region corresponding portion 5B and the portion on the exposed surface 72 side of the outer edge corresponding portion 5D are omitted from the water-repellent layer 4 shown in Fig. 6.

[0076] [1-2 Second Embodiment] A second embodiment of the lid of the present invention will be described. [1-2-1 Configuration of the Lid] As shown in Figures 9A to 9C, the lid 1 according to the second embodiment is configured similarly to the first embodiment except for the formation of the insertion port 19. Figures 9A and 9B are a plan view and a cross-sectional view, respectively, showing an example of a second example of the lid 1. Figure 9C is a schematic view showing the vertical cross section taken along line H-H in Figure 9A. In the second embodiment, the base sheet 3, the water-repellent layer 4, the hydrophobic organic compound, and the like are the same as those in the first embodiment. Note that in the description of the second embodiment, explanations of the same aspects as those in the first embodiment will be omitted.

[0077] (Inlet Port) The outlet port 19 is a structural portion that allows various members to be inserted into the container 101 from the outside when the lid body 1 is used in the lid-equipped container 150. Examples of insertable members include a straw. The outlet port 19 is formed at least in the lid region corresponding portion 5B, and in the example shown in FIGS. 9A and 9B , it is formed by a through-hole 21. The through-hole 21 has a structure (a penetrating structure) cut in the vertical direction (thickness direction, Z-axis direction) from one side (exposed surface 72) of the lid body 1 to the other side (opposing surface 73), and is a so-called cut portion 20. The through-hole 21 can function as a gas vent. Here, the gas vent refers to a portion that allows gas to pass from one side of the lid body 1 to the other side (from the opposing surface 73 to the exposed surface 72).

[0078] (Shape of Receptacle) The shape of the receptacle 19 is not particularly limited as long as it can be formed by cutting. For example, in the example of Fig. 9A, the cover 1 has a cutout 20 formed in the shape of a cross cut into the cover 1 in the vertical direction, and this cutout 20 forms a through-hole 21, which constitutes the receptacle 19. Note that this is just one example, and the shape of the cutout 20 that forms the through-hole 21 is not limited to a cross shape, and various shapes such as a C-shape or a tongue-like shape may be used as long as it is a shape that can be used as the receptacle 19.

[0079] 9B , in the lid 1, the cross section of the base sheet 3 is exposed at the cut surface of the slit that forms the through-hole 21, and the end face of the water-repellent layer 4 is disposed or the cross section of the water-repellent layer 4 is exposed in at least a part of the portion corresponding to the surface of the base sheet 3. In this case, it is preferable that the water-repellent layer 4 covers at least a part of the cut surface of the slit that forms the through-hole 21 of the base sheet 3. By having the water-repellent layer 4 cover the above-mentioned cut surface, it is possible to slightly suppress the seepage of the liquid contained in the container 101 from the through-hole 21 into the base sheet 3.

[0080] [1-2-2 Actions and Effects] The lid 1 according to the second embodiment can provide the same effects as those of the first embodiment.

[0081] Next, a modification of the second embodiment will be described.

[0082] [1-2-3 Modifications] (Modifications) In the lid 1 according to the second embodiment, the insertion port 19 may be formed with a weakened portion 24, as shown in Figures 10A and 10B. This configuration is referred to as a modification of the second embodiment. Figure 10A is a plan view schematically showing one example of the lid 1 according to a modified example of the second embodiment. Figure 10B is a view schematically showing one example of a vertical cross section taken along line II in Figure 10A.

[0083] (Weakened Portion) As shown in the example of FIG. 10A , the weakened portion 24 has a plurality of through-holes 21 and at least one continuous portion 22 formed between the ends of at least two of the through-holes 21. When a lifting or depressing force is applied to the weakened portion 24 to form a divided portion in the lid body, the weakened portion 24 guides the position where the division will occur (the division position). In other words, the position where the division will occur is formed generally along the weakened portion. For example, in the example of FIG. 10A , when a force is applied that presses down the portion corresponding to the socket 19 from the exposed surface 72 side toward the facing surface 73 side, the continuous portion 22 is broken, and a division occurs from the continuous portion 22 along the through-holes 21, resulting in the socket 19 being opened (the socket 19 is opened).

[0084] (Layout of Weakened Portion) The layout of the weakened portion 24 is not particularly limited and may be determined depending on conditions such as the function of the weakened portion 24. In the example of the weakened portion 24 shown in FIG. 10A , the continuous portion 22 is formed in one location, and a total of four through-holes 21 are formed. In this example, the through-holes 21 are formed so as to extend radially from the continuous portion 22 in four different directions. Note that this is just one example of the weakened portion 24. In the case where the weakened portion 24 has multiple through-holes 21 formed radially around the continuous portion 22, the through-holes 21 may extend in three directions away from the continuous portion 22, or in five or more directions. Furthermore, the through-holes 21 may extend in two directions away from the continuous portion 22.

[0085] 10A, the weakened portion 24 is formed in a cross shape, but may be formed in a C-shape. Furthermore, the formation location of the continuous portion 22 is not limited to one location as shown in the example of FIG. 10A, but may be formed in multiple locations.

[0086] The position of the weakened portion 24 is not particularly limited, but it is preferable that the weakened portion 24 be provided in the lid region corresponding portion 5B. In this case, the dividing position is formed in the lid region corresponding portion 5B.

[0087] (Continuous Portion) The continuous portion 22 may be any portion formed so as not to penetrate the lid 1. It may be a non-cut portion, or, as shown in FIG. 11 , a half-cut portion 26 formed by cutting the lid 1 in the thickness direction to a degree that avoids penetrating the lid 1. FIG. 11 is a diagram for explaining an embodiment in which the continuous portion 22 is a half-cut portion 26. The half-cut portion 26 is specified as a portion that forms a half-cut structure, in which the lid 1 is cut partway in the thickness direction of the lid 1. Note that the half-cut portion 26 is not limited to a portion cut halfway through the thickness of the lid 1 in the thickness direction of the lid 1. The half-cut portion 26 also includes a structure in which the lid 1 is cut halfway through the thickness of the lid 1 while avoiding penetration, or a structure in which the lid 1 is cut less than halfway through the thickness of the lid 1 in the thickness direction. Note that, although the case in which the continuous portion 22 is a half-cut portion 26 has been described here, the entire portion forming the insertion port 19 (the entire weakened portion 24) may be a half-cut portion 26.

[0088] [1-3 Third Embodiment] A third embodiment of the lid of the present invention will be described. [1-3-1 Configuration of the Lid] As shown in Figures 12A, 12B, and 12C, the lid 1 according to the third embodiment includes a base portion 52 having a small opening 56 with an opening area smaller than the opening 102 of the container 101, a small lid portion 53 for opening and closing the small opening 56, and a hinge portion 54 connecting the base portion 52 and the small lid portion 53. In other respects, the lid 1 according to the third embodiment is configured similarly to the first or second embodiment. For example, in the third embodiment, the configurations of the base sheet 3, the water-repellent layer 4, the hydrophobic organic compound, the bonding region corresponding portion 5A, the lid region corresponding portion 5B, the outer region corresponding portion 5C, etc. are the same as those described in the first embodiment. In the description of the third embodiment, the same points as those described in the first or second embodiment will not be described again. 12A and 12B are a plan view and a cross-sectional view, respectively, showing an example of the lid body 1 according to the third embodiment, and Fig. 12C is a cross-sectional view illustrating a state in which the small lid portion 53 is displaced to expose the small opening 56.

[0089] 12A, 12B, etc., the lid body 1 according to the third embodiment has a base portion 52, a small lid portion 53, and a hinge portion 54. In the example of Figures 12A and 12B, the lid region corresponding portion 5B of the lid body 1 has the base portion 52, the small lid portion 53, and the hinge portion 54, and the outer region corresponding portion 5C has the base portion 52 (the base portion 52 is formed across the lid region corresponding portion 5B and the outer region corresponding portion 5C).

[0090] (Base portion) The base portion 52 is defined as a portion that has a bonding region corresponding portion 5A and forms a small opening 56. The base portion 52 can be a portion that determines a reference for displacement of the small lid portion 53, which will be described later. In the example of FIG. 12A , in a plan view of the lid body 1, the base portion 52 and the small lid portion 53 form an exposed surface 72 of the lid body 1. In the lid body 1 according to the third embodiment, in a plan view of the lid body 1 (when the line of sight is in the Z-axis direction (up and down direction) in the example of FIG. 12A ), the bonding region corresponding portion 5A corresponds to the portion that forms the bonding region R, and is formed in the base portion 52.

[0091] (Small Opening) The small opening 56 is formed to penetrate the surface 73 of the lid 1 facing the container 101 and the surface of the lid 1 not facing the container 101 (the exposed surface 72 of the lid 1). In FIG. 12A , the small opening 56 is formed as an opening on the inside of the base portion 52 (at a position closer to the center CT than the outer peripheral edge 75 of the outer region corresponding portion 5C). The small opening 56 is formed inside the portion of the lid 1 corresponding to the joining region corresponding portion 5A in a plan view so as to have a smaller opening area than the opening 102 of the container 101. The small opening 56 is intended to form an opening for the contents (e.g., beverages, food, etc.) in the space portion 105 of the container 101 when the lid 1 is joined to the container 101. The small opening 56 forms an opening forming portion 60 in combination with the small lid portion 53 described below.

[0092] (Opening Forming Portion) As shown in FIG. 12A and other figures, the opening forming portion 60 is defined as a portion having the small opening 56 and the small lid portion 53. In the opening forming portion 60, the small opening 56 opens and closes as the small lid portion 53 is displaced. The opening forming portion 60 is formed so that the small lid portion 53 closes the small opening 56 as shown in FIGS. 12A and 12B , and the small lid portion 53 is displaced to open the small opening 56 as shown in FIG. 12C . When the small lid portion 53 is rotated relative to the base portion 52 so as to be pulled up, the small opening 56 appears, becoming an exposure opening that exposes the interior of the container 101 to the outside when the container 101 is in the lid-equipped container state. In other words, the opening forming portion 60 combines the small opening 56 and the small lid portion 53 so that the space portion 105 of the container 101 can be viewed through the small opening 56 when the small lid portion 53 is pulled up with the lid 1 attached to the container 101. FIG. 12C is a cross-sectional view illustrating a state in which the small opening 56 is open.

[0093] When the small opening 56 is in the exposed state, it can be used as a supply port for additional liquid such as a beverage or solids such as ice, as will be described later. Furthermore, when a liquid such as a beverage is present inside the container 101 (space 105), the small opening 56 may be used as a drinking port or a pouring port for the beverage.

[0094] (Small Lid Portion) The lid body 1 is provided with a small lid portion 53. The small lid portion 53 is formed to be able to cover the small opening 56 in an openable and closable manner. The small lid portion 53 is formed so that it can be lifted up relative to the base portion 52, and the small opening 56 is formed (opened) when the small lid portion 53 is lifted up. In the example shown in FIG. 12A , the shape of the small lid portion 53 can be determined so that the outer peripheral contour shape of the small lid portion 53 conforms to the shape of the opening edge 56A of the small opening 56 when the small lid portion 53 closes the small opening 56. In this case, it is easy to bring the end surface of the outer peripheral edge 53A of the small lid portion 53 into contact with the end surface of the opening edge 56A of the small opening 56 when the small lid portion 53 closes the small opening 56.

[0095] In the lid body 1 shown in the example of FIG. 12A , the small lid portion 53 is provided inside the joint area corresponding portion 5A (lid area corresponding portion 5B) (toward the center CT of the lid area corresponding portion 5B) in a plan view of the lid body 1. The small lid portion 53 is displaced (rotated) so that it is in a lifted state. The small lid portion 53 is connected to the base portion 52 by a hinge portion 54. As the small lid portion 53 is lifted around the hinge portion 54 as a support axis, the small opening 56 is exposed.

[0096] In the lid body 1, when the small lid portion 53 is raised, the small opening 56 is exposed as described above. This state is called the open lid state. When the small opening 56 is covered by the small lid portion 53, it is called the closed lid state.

[0097] The lid body 1 can be closed again even after it has been opened (after the small opening 56 has been exposed by the small lid portion 53 being raised), and when it is closed, the end face (outer peripheral end face) of the outer peripheral edge 53A of the small lid portion 53 can face the end face of the opening edge 56A of the small opening 56 in the base portion 52.

[0098] (Hinge Portion) As described above, the cover 1 has the hinge portion 54. The hinge portion 54 is generally configured by a portion corresponding to a line segment connecting the two base ends 84 along the outer peripheral edge 53A of the small cover portion 53, and corresponds to the boundary between the base portion 52 and the small cover portion 53. The hinge portion 54 is a portion that serves as a rotation axis when the small cover portion 53 rotates. However, when the small cover portion 53 rotates, this includes not only a case where the small cover portion 53 rises from the base portion 52 at a fixed angle at the position of the hinge portion 54, but also a case where the small cover portion 53 rises while gradually curving from the hinge portion 54 toward the front edge portion 85 of the small cover portion 53.

[0099] The base portion 52 is connected to the small cover portion 53 at least by a hinge portion 54. The structure of the hinge portion 54 is not particularly limited as long as it is a portion defined as the boundary between the base portion 52 and the small cover portion 53. The hinge portion 54 may have a perforated structure or a half-cut portion, similar to the connection structure described below.

[0100] (Boundary Between the Outer Edge of the Small Lid Portion and the Edge of the Small Opening) At the boundary between the outer edge 53A of the small lid portion 53 and the edge 56A of the small opening 56, when the lid body 1 is unused (when the lid body 1 is not yet opened), the small lid portion 53 and the small opening 56 may be separated (disconnected), or a connecting structure may be formed as described below. When the small lid portion 53 and the small opening 56 are disconnected at the boundary between the outer edge 53A of the small lid portion 53 and the edge 56A of the small opening 56, a structure (e.g., a structure similar to the through-portion 21) is formed that separates the outer edge 53A of the small lid portion 53 from the edge 56A of the small opening 56. The structure of the through-portion 21 is the same as that described for the lid body 1 of the second embodiment, and therefore will not be described here.

[0101] (Connection Structure Between Base Portion and Small Lid Portion) In the lid body 1, a structure (connection structure) may be formed at the boundary between the outer peripheral edge 53A of the small lid portion 53 and the opening edge 56A of the small opening 56, as described above, in which the opening edge 56A of the small opening 56 in the base portion 52 is connected to the outer peripheral edge 53A of the small lid portion 53 (not shown). As shown in FIG. 10 and other figures corresponding to the lid body 1 of the second embodiment, the connection structure preferably has a continuous portion 22 and is similar in structure to the weakened portion 24. In this case, the weakened portion 24 forming the connection structure is configured as a portion weaker than the small lid portion 53. The weakened portion 24 allows the weakened portion 24 to be destroyed (the continuous portion 22 to be destroyed) when the small lid portion 53 rotates relative to the base portion 52 about the hinge portion 54. Furthermore, the small lid portion 53 is raised relative to the base portion 52 while being separated from the base portion 52 generally along the connection structure.

[0102] (Weakened portion) The weakened portion 24 serving as the connecting structure may be formed by a combination (perforated structure) of the through portion 21 and the continuous portion 22, as described in the lid 1 of the second embodiment. In the example of the connecting structure described above, the weakened portion 24 serving as the connecting structure may be a combination structure of the continuous portion 22 and the through portion 21. When the connecting structure has the continuous portion 22 and the through portion 21, the continuous portion 22 may be a half-cut portion 26, as described in the lid 1 of the second embodiment using FIG. 11 .

[0103] [1-3-2 Actions and Effects] The lid 1 according to the third embodiment can provide the same effects as those of the first embodiment.

[0104] Next, modified examples of the third embodiment will be described. [1-3-3 Modifications] (Modification 1) As shown in Figures 13A and 13B, the lid 1 of the third embodiment may be provided with a knob 61 on the small lid portion 53. A lid 1 having such a configuration is referred to as Modification 1 of the third embodiment. Figure 13A is a plan view schematically showing one example of the lid 1 according to Modification 1 of the third embodiment. Figure 13B is a cross-sectional view schematically showing the state of the vertical cross section taken along line K-K in Figure 13A.

[0105] The lid body 1 according to variant example 1 of the third embodiment may be the same as the lid body 1 according to the third embodiment described above, except for the configuration in which the knob portion 61 is provided on the small lid portion 53, and therefore, explanations of other configurations (base portion 52, hinge portion 54, etc.) other than the configuration in which the knob portion 61 is provided on the small lid portion 53 will be omitted.

[0106] 13A and 13B , in a first variation of the third embodiment, a knob 61 is provided on the upper surface, which is the exposed surface (exposed surface 72 of lid body 1) of small lid 53 when small opening 56 is closed by small lid 53. The structure of knob 61 is not particularly limited as long as it allows small lid 53 to be rotated around hinge 54 as an axis, but in the example of FIGS. 13A and 13B , a tab member 62 is provided as knob 61.

[0107] 13A and 13B, when the small opening 56 is closed by the small lid portion 53, the tab member 62 has one end 62A joined to the small lid portion 53 and the other end 62B of the tab member 62 as a free end. The portion of the tab member 62 joined to the small lid portion 53 is called the tab joint portion 63. The portion of the tab member 62 on the free end side (the portion on the other end 62B side) of the tab member 62 excluding the tab joint portion 63 is not particularly limited in shape or structure as long as it is formed in a size and shape that allows the tab member 62 to be picked up by hand. The material of the tab member 62 may be the same as the material of the base sheet 3 described in the lid body 1 of the first embodiment.

[0108] In the lid body 1, the attachment position or attachment direction of the tab member 62 on the small lid portion 53 is not particularly limited, but in the example of Figures 13A and 13B, the tab member 62 is joined to the small lid portion 53 at a position near the tip of the small lid portion 53 (i.e., near the front edge portion 85).

[0109] The method for joining the tab member 62 to the small lid portion 53 (i.e., the method for forming the tab joint 63) can be various methods such as ultrasonic joining, heat sealing, and joining with an adhesive. Of the above-mentioned methods for forming the tab joint 63, ultrasonic joining is preferred from the viewpoints of ease of joining and joining strength. The position at which the tab joint 63 is formed on the small lid portion 53 is preferably shifted from the center of the small lid portion 53 from the viewpoint of making it easy to raise the small lid portion 53 (rotate the small lid portion 53) by lifting the tab member 62.

[0110] (Orientation of tab member (attachment direction)) In the example of Fig. 13A , the tab member 62 is arranged so that the other end 62B (free end) of the tab member 62 is closer to the hinge portion 54 than one end 62A of the tab member 62. However, this is just one example, and the orientation of the tab member 62 may be in a direction other than the direction shown in the example of Fig. 13A . For example, the tab member 62 may be arranged so that the other end 62B of the tab member 62 is farther from the hinge portion 54 than one end 62A of the tab member 62.

[0111] In the cover 1 according to the first modified example of the third embodiment, the knob 61 is provided, so that the small cover 53 can be easily pulled up (to the raised state as shown in Fig. 13C). Fig. 13C is a cross-sectional view illustrating the state in which the small opening 56 is open.

[0112] (Variation 2) As shown in the examples of Figures 14A and 14B, the lid body 1 according to Variation 1 of the third embodiment may have a holding structure forming portion that forms a holding structure that holds the small lid portion 53 in a state in which the small opening 56 is opened by rotating the small lid portion 53 relative to the base portion 52 about the hinge portion 54. A lid body 1 having such a configuration is referred to as Variation 2 of the third embodiment. Figure 14A is a plan view schematically showing one example of the lid body 1 according to Variation 2 of the third embodiment. Figure 14B is a cross-sectional view schematically showing the state of the vertical cross section taken along line F-F in Figure 14A.

[0113] (Holding Structure Forming Portion) The configuration of the holding structure forming portion is not particularly limited. For example, in the example of the lid body 1 shown in Figures 14A and 14B, the claw portion 64 and the receiving portion 65 form the holding structure forming portion.

[0114] (Claw portion) As shown in the example of Fig. 14A, the claw portion 64 may be any portion having a structure that allows it to be latched onto a receiving portion 65 (described later) by hooking, insertion, or the like. In the example of Fig. 14A, the claw portion 64 is provided on a tab member 62, which is an example of a knob portion 61. In this example, the claw portion 64 is formed by a notch formed in a predetermined position of the tab member 62 in a contour shape such as a mountain shape.

[0115] (Receiving Portion) The receiving portion 65 is formed in a shape that allows the claw portion 64 to be engaged or inserted. In the example of Fig. 13A, the receiving portion 65 is a slit portion formed by cutting a predetermined position in the base portion 52. In this case, the receiving portion 65 may be a structural portion corresponding to the through portion 21 described in the lid body 1 of the second embodiment. The receiving portion 65 is formed in a position that allows it to face the claw portion 64 when the tab member 62 is displaced to rotate the small lid portion 53.

[0116] (Formation of Retaining Structure) When raising the small lid portion 53 of the lid body 1, the knob portion 61 is pulled up. At this time, the tab member 62 is pulled up and a predetermined portion of the free end side (the other end 62B side) of the tab member 62 is bent so that the claw portion 64 protrudes downward or upward. Then, the tab member 62 is displaced so as to rotate the small lid portion 53 until the claw portion 64 of the small lid portion 53 reaches a position facing the receiving portion 65 or a position near that position. The claw portion 64 of the tab member 62 is then hooked or inserted into the receiving portion 65. This forms a retaining structure that holds the small lid portion 53 with the small opening 56 exposed.

[0117] The application example of the lid will be explained further.

[0118] [2 Application Example] The lid 1 described above can be used in a lidded container 150 as shown in Figures 15A and 15B. Figure 15A is a perspective view showing an example in which the lid 1 according to the first embodiment is joined to an edge 103 that forms the outer periphery of an opening 102 of a container 101 having an opening 102 formed at the top end. Figure 15B is a cross-sectional view that schematically shows the state of the vertical cross section taken along line M-M in Figure 15A. The explanation of the lidded container 150 will continue with reference to Figures 15A and 15B.

[0119] (Container with Lid) The container with lid 150 has a joint 151 where the container 101 and the lid 1 are joined, and the region of the lid 1 where the joint 151 is formed is the joint region R. The method for joining the lid 1 and the container 101 is not particularly limited, and any suitable joining method such as crimping or heat sealing can be used. The following description will be given taking as an example a case where the lid 1 according to the first embodiment is used in the container with lid 150.

[0120] In the example shown in FIGS. 15A and 15B , the container 101 has a container body 110 having a cylindrical sidewall 104 and a bottom 107 that increase in diameter upward (or taper downward), forming a space 105 inside, and an opening 102 that opens at the upper end of the container body 110 (the upper end of the sidewall 104). Although not shown, the opening 102 of the container 101 is circular. However, the container 101 shown here is merely an example and is not intended to limit the configuration of the container 101. For example, the opening 102 of the container 101 may be rectangular. The container 101 may be any container as long as the opening 102 can be covered with the lid 1. Furthermore, the substance stored inside the container 101 (space 105) is not particularly limited, and examples include liquid substances, solid substances, and combinations thereof.

[0121] 15A and 15B, the edge 103 of the opening 102 has a flange portion. The flange portion may be a curled portion 108 formed by outwardly winding a member forming the container body 110 as shown in Figures 15A, 15B, etc., or may be formed as a portion (a flange portion) that extends outward on a plane.

[0122] The lid 1 may also be combined with a container 101 having an opening 102 .

[0123] The above description of [4. Application Examples] is not limited to the use of the lid 1 according to the first embodiment. The lids according to the second and third embodiments can also be used in the lidded container 150 joined to the container 101, similar to the lid 1 according to the first embodiment, and can also be used as a combination of the lid 1 and the container 101 (not shown).

[0124] The lid and the like according to the present invention have been described in detail above, but the above are merely examples of the lid and the like according to the present invention and are not limited to these. Therefore, appropriate modifications may be made within the scope of the present invention.

[0125] Based on the above description of this specification, the present invention may adopt the following configurations [E1] to [E11]. [E1] A lid used to be joined to a container having an opening and a rim forming an outer periphery of the opening at the position of the rim, the lid having an opposing surface corresponding to the surface facing the container and an exposed surface corresponding to the surface behind the opposing surface, the lid having a base sheet containing a paper-based material and a water-repellent layer containing a non-synthetic resin-based hydrophobic organic compound, wherein, when the thickness direction of the base sheet is the line of sight, a joining region corresponding to the portion joined to the rim and a lid region corresponding to the portion inward from the inner rim of the joining region corresponding to the joining region corresponding, the water-repellent layer is provided at least in the lid region corresponding portion closer to the opposing surface than the base sheet, and a sheet exposed region exposing the base sheet is formed in at least a portion of the joining region corresponding to the surface forming the opposing surface. [E2] The lid according to [E1] above, the water-repellent layer is further provided in the lid region corresponding portion closer to the exposed surface than the base sheet. [E3] The lid according to [E2] above, wherein the water-repellent layer provided on the opposing surface side of the lid region corresponding portion is a first water-repellent layer, and the water-repellent layer provided on the exposed surface side of the lid region corresponding portion is a second water-repellent layer, and when the thickness direction of the base sheet is the line of sight, a region where the first water-repellent layer is formed and a region where the second water-repellent layer is formed overlap. [E4] The lid according to any one of [E1] to [E3] above, wherein the sheet exposed region is further formed in at least a partial region of the surface of the bonding region corresponding portion that forms the exposed surface. [E5] The lid according to [E4] above, wherein the sheet exposed region provided on the opposing surface side of the bonding region corresponding portion is a first sheet exposed region, and the sheet exposed region provided on the exposed surface side of the bonding region corresponding portion is a second sheet exposed region, and when the thickness direction of the base sheet is the line of sight, the first sheet exposed region and the second sheet exposed region overlap. [E6] The lid according to any one of [E1] to [E5] above, wherein the sheet exposed area is formed on the entire area of ​​the surface of the joint area corresponding portion that forms the opposing surface side.[E7] The lid according to any one of [E1] to [E6] above, wherein the water-repellent layer has a continuous surface forming portion and a discontinuous surface forming portion, and the discontinuous surface forming portion is formed outside the continuous surface forming portion in a plan view of the base sheet. [E8] The lid according to any one of [E1] to [E7] above, wherein, when a portion outward from an outer peripheral edge of the lid region corresponding portion is defined as an outer region corresponding portion, the outer region corresponding portion is formed outward from an outer edge of the bonding region corresponding portion, and the water-repellent layer is further provided on a portion of the outer region corresponding portion outward from the position of the outer edge of the bonding region corresponding portion, and on the exposed surface side of the base sheet. [E9] The lid according to any one of [E1] to [E8] above, wherein, when the portion outward from the outer periphery of the lid region corresponding portion is defined as an outer region corresponding portion, the outer region corresponding portion is formed outward beyond the outer edge of the bonding region corresponding portion, and the water-repellent layer is further provided on a portion of the outer region corresponding portion outward from the position of the outer edge of the bonding region corresponding portion and on the opposing surface side of the base sheet. [E10] The lid according to any one of [E1] to [E9] above, wherein the water-repellent layer contains a thickener. [E11] The lid according to any one of [E1] to [E10] above, wherein the hydrophobic organic compound is a wax. [E12] The lid according to any one of [E1] to [E11] above, wherein the hydrophobic organic compound is biodegradable. [E13] The lid according to any one of [E1] to [E12] above, wherein the base sheet is formed of a material that avoids petroleum-based synthetic resins. [E14] The lid according to any one of [E1] to [E13] above, wherein the water-repellent layer is a coating film formed on the surface of the base sheet. [E15] A lidded container, comprising: the lid according to any one of [E1] to [E14] above, and the container having the opening and the edge portion forming the periphery of the opening, wherein the lid is joined to the container. [E16] A combination of a lid and a container, comprising: the lid according to any one of [E1] to [E14] above, and the container having the opening and the edge portion forming the periphery of the opening.

[0126] DESCRIPTION OF SYMBOLS 1: Lid 2: Fiber-containing sheet 3: Base sheet 4: Water-repellent layer 4A: First water-repellent layer 4B: Second water-repellent layer 5A: Joint area corresponding portion 5B: Lid area corresponding portion 5C: Outer area corresponding portion 5D: Outer edge corresponding portion 6: Continuous surface forming portion 7: Discontinuous surface forming portion 8: Adhesion portion 9: First thickness portion 10: Second thickness portion 19: Insertion opening 20: Cut portion 21: Penetration portion 22: Continuous portion 24: Weakened portion 26: Half-cut portion 52: Base portion 53: Small lid portion 53A: Outer peripheral edge 54: Hinge portion 56: Small opening 56A: Opening edge 60: Opening forming portion 61: Knob portion 62: Tab member 62A : One end 62B : Other end 63 : Tab joint 64 : Claw portion 65 : Receiving portion 72 : Exposed surface 73 : Opposing surface 74 : Outer rim 75 : Outer rim 76 : Inner rim 77 : Outer rim 84 : Base end 85 : Front edge 101 : Container 102 : Opening 103 : Edge 104 : Side wall 105 : Space 107 : Bottom 108 : Curled portion 110 : Container body 150 : Container with lid 151 : Joint CT : Center R : Joint region SE : Sheet exposed region SE1 : First sheet exposed region SE2 : Second sheet exposed region WT : Liquid

Claims

1. A lid used to be attached to a container having an opening and a rim that forms the periphery of the opening at the position of the rim, having an opposing surface corresponding to the surface facing the container and an exposed surface corresponding to the surface behind the opposing surface, and comprising a base sheet containing a paper-based material and a water-repellent layer containing a non-synthetic resin-based hydrophobic organic compound, wherein, when the thickness direction of the base sheet is the line of sight, a joining area corresponding to the part that is joined to the rim and a lid area corresponding to the part that is inward from the inner edge of the joining area corresponding to the 2. The lid body according to claim 1, wherein the water-repellent layer is further provided on the lid area corresponding portion closer to the exposed surface than the base sheet.

3. The lid body according to claim 2, wherein the water-repellent layer provided on the opposing surface side of the lid area corresponding portion is a first water-repellent layer, and the water-repellent layer provided on the exposed surface side of the lid area corresponding portion is a second water-repellent layer, and when the thickness direction of the base sheet is the line of sight, the area where the first water-repellent layer is formed and the area where the second water-repellent layer is formed overlap.

4. The lid according to claim 1 or 2, wherein the sheet exposed area is further formed in at least a portion of the surface of the bonding area corresponding portion that forms the exposed surface.

5. The lid according to claim 4, wherein the sheet exposed area provided on the opposing surface side of the joint area corresponding part is the first sheet exposed area, and the sheet exposed area provided on the exposed surface side of the joint area corresponding part is the second sheet exposed area, and when the thickness direction of the base sheet is the line of sight, the first sheet exposed area and the second sheet exposed area overlap.

6. The lid according to claim 1, wherein the sheet exposed area is formed over the entire area of ​​the surface of the joining area corresponding portion that forms the opposing surface side.

7. The lid according to claim 1, wherein the water-repellent layer has a continuous surface forming portion and a discontinuous surface forming portion, and the discontinuous surface forming portion is formed outside the continuous surface forming portion in a plan view of the base sheet.

8. The lid according to claim 1, wherein, when the portion outward from the outer periphery of the lid region corresponding portion is defined as the outer region corresponding portion, the outer region corresponding portion is formed outward from the outer edge of the bonding region corresponding portion, and the water-repellent layer is further provided on the portion of the outer region corresponding portion outward from the position of the outer edge of the bonding region corresponding portion, and on the exposed surface side of the base sheet.

9. The lid according to claim 1, wherein, when the portion outward from the outer periphery of the lid region corresponding portion is defined as the outer region corresponding portion, the outer region corresponding portion is formed outward from the outer edge of the bonding region corresponding portion, and the water-repellent layer is further provided on the portion of the outer region corresponding portion outward from the position of the outer edge of the bonding region corresponding portion, and on the opposing surface side of the base sheet.

10. The lid according to claim 1, wherein the water-repellent layer contains a thickener.

11. The lid according to claim 1, wherein the hydrophobic organic compound is a wax.

12. The lid according to claim 1, wherein the hydrophobic organic compound is biodegradable.

13. The lid according to claim 1, wherein the base sheet is formed from a material that avoids petroleum-based synthetic resins.

14. The lid according to claim 1, wherein the water-repellent layer is a coating film formed on the surface of the base sheet.

15. A container with a lid, comprising: the lid according to claim 1; and a container having the opening and the edge that forms the outer periphery of the opening, wherein the lid is joined to the container.

16. A lid-container combination comprising: the lid according to claim 1; and the container having the opening and the edge that forms the periphery of the opening.

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