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

Abstract

To provide a lid body made of a paper-based base material and having both water repellency and heat sealability, a container with the lid body, and a combination of the lid body and the container.SOLUTION: The lid body includes a main body having a paper-based base material having a plurality of fibers, and a surface attachment portion is provided on the surface of the main body as a portion where a non-synthetic resin water-repellent compound is attached to the fibers arranged on at least one surface of the paper-based base material, and when a pressing force is applied to the surface of the surface attachment portion, the surface of the surface attachment portion of the fibers is configured to become a deformed surface as the surface after the application of the pressing force depending on the magnitude of the applied pressing force, and a recess is formed on the deformed surface.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] As shown in Patent Document 1, plastic lids have been widely used to cover the openings of containers such as cups due to their cost and moldability. However, the environmental impact of plastics has become a problem. In particular, since containers with lids (lidded containers) are discarded after their intended use, using conventional synthetic plastics, such as petroleum-based synthetic resins, as lid materials has been recognized as a problem, as they do not naturally decompose after disposal and remain in nature for a long period of time. To address this issue, the use of biodegradable plastics has been considered, even when using plastic as a lid material. However, while biodegradable plastics are more biodegradable than conventional synthetic plastics, there is a strong demand for cost improvements. In light of these issues, the use of paper-based substrates for lids has been considered, as they are a material (non-plastic material) with a lower environmental impact than plastics. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-84646 Summary of the Invention [Problem to be solved by the invention]

[0004] When the contents contained in a container with a lid are those that release steam or gas, such as hot beverages or cold carbonated beverages, and a paper-based substrate is used as the material for the lid, further improvements in the paper-based material are required in terms of water repellency.

[0005] In order to improve water repellency, it is also possible to form a lid from a sheet having resin layers formed on both sides. However, since a resin coating layer is usually formed on the surface of the container to waterproof the container, depending on the resin material constituting the resin layer, adhesion with the resin constituting the resin coating layer may be impaired, which may make it difficult to bond the container and the lid by the heat sealing method. Therefore, there is room for improvement in terms of making it possible to bond the container and the lid by the heat sealing method even when the types of resins constituting the resin coating layer formed on the surface of the container are diversified.

[0006] 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 uses a paper-based substrate made of a non-plastic material and has both water repellency and heat sealability. [Means for solving the problem]

[0007] The present invention is summarized as follows: (1) to (8).

[0008] (1) A lid body having a main body with a paper-based substrate having a plurality of fibers, wherein a surface attachment portion is provided on the surface of the main body as a portion where a non-synthetic resin-based water-repellent compound is attached to the fibers arranged on at least one surface of the paper-based substrate, and when a pressing force is applied to the surface of the surface attachment portion, the surface of the surface attachment portion is configured to become a deformed surface as the surface after the application of the pressing force depending on the magnitude of the applied pressing force, and a recess is formed in the deformed surface. (2) A lid body in which, when the surface of the surface attachment portion becomes the deforming surface, at least a portion of the area of ​​the paper-based substrate covered by the surface of the surface attachment portion is exposed before the application of the pressing force. (3) A lid body as described in (1) above, in which, when the surface of the main body on which the surface attachment portion is arranged is considered to be the arrangement surface, there is a non-arrangement area on the front arrangement surface where the surface attachment portion is not arranged, and the fibers are exposed in the non-arrangement area. (4) The lid body described in (1) above, wherein the surface attachment portion forms a layer, and the thickness of the layer is non-uniform so that the recess is formed on the deformed surface when a pressing force is applied to the surface attachment portion. (5) A lid body as described in (4) above, in which, when the surface of the surface attachment portion becomes the deforming surface, at least a portion of the area of ​​the paper-based substrate covered by the surface of the surface attachment portion is exposed before the application of the pressing force. (6) The lid according to (1) above, wherein the water-repellent compound is a biodegradable organic compound. (7) The lid according to (1) above, wherein the water-repellent compound is an organic compound derived from plant materials. (8) A container with a lid, comprising the lid described in (1) above and a container having a container body with an opening formed at the upper end and an edge forming the outer periphery of the opening, wherein the lid is joined to the container. (9) A container with a lid described in (8) above, in which a resin coating layer is formed on the inner surface of the container body, the resin coating layer is further formed on the upper surface of the edge portion, and the lid is joined to the container via the resin coating layer. (10) A combination of a lid and a container, comprising the lid described in (1) above and a container having an opening formed at the top end and an edge forming the outer periphery of the opening. [Effects of the Invention]

[0009] 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 uses a paper-based substrate and has both water repellency and heat sealability. [Brief explanation of the drawings]

[0010] [Figure 1] Fig. 1A is a plan view schematically showing an example of a lid according to the first embodiment, Fig. 1B is a cross-sectional view schematically showing a longitudinal section taken along line AA in Fig. 1A, and Fig. 1C is a bottom view schematically showing an example of a lid according to the first embodiment. [Figure 2]Fig. 2A is a partially enlarged plan view for schematically illustrating an enlarged state of the region XS1 surrounded by the dashed line in Fig. 1C, and Fig. 2B is an enlarged plan view for explaining the region where the surface-attaching portion is provided and the region where no surface-attaching portion is provided in the region XS1 surrounded by the dashed line in Fig. 1C. [Figure 3] Fig. 3A shows a longitudinal cross section taken along line BB in Fig. 2A, and is a cross-sectional view schematically showing one example of the state of the surface attachment portion before a pressing force is applied to the surface attachment portion. Fig. 3B is a cross-sectional view schematically showing one example of the state of the surface attachment portion after a pressing force is applied to the surface attachment portion. Fig. 3C is a cross-sectional view schematically showing one example of the state of the surface attachment portion after a pressing force is applied to the surface attachment portion due to heat sealing. Fig. 3D is a cross-sectional view schematically showing one example of the state of the surface attachment portion after a pressing force is applied to the surface attachment portion. [Figure 4] Fig. 4A is a plan view showing an example of the state of the surface attachment portion after a pressing force is applied to the surface attachment portion due to heat sealing, and Fig. 4B is a plan view showing an example of the modified exposed area. [Figure 5] Fig. 5A is a plan view schematically showing an example of a lid according to Modification 1 of the first embodiment, and Fig. 5B is a cross-sectional view schematically showing the state of a vertical cross section taken along line CC in Fig. 5A. [Figure 6] Fig. 6A is a plan view schematically showing an example of a lid according to Modification 2 of the first embodiment. Fig. 6B is a cross-sectional view schematically showing a longitudinal cross section taken along line DD in Fig. 5A. Fig. 6C is a partially enlarged cross-sectional view schematically showing an enlarged state of a region XS2 surrounded by a dashed line in Fig. 6B. [Figure 7] Fig. 7A is a plan view schematically showing an example of a lid according to Modification 3 of the first embodiment. Fig. 7B is a cross-sectional view schematically showing a longitudinal cross section taken along line EE in Fig. 7A. Fig. 7C is a partially enlarged cross-sectional view schematically showing an enlarged state of a region XS3 surrounded by a dashed line in Fig. 7B. [Figure 8]Fig. 8A is a plan view schematically showing one example of a lid according to the second embodiment. Fig. 8B is a cross-sectional view schematically showing a state of a vertical cross section taken along line FF in Fig. 8A. Fig. 8C is a partially enlarged cross-sectional view schematically showing an enlarged state of a region XS4 surrounded by a dashed line in Fig. 8B. Fig. 8D is a cross-sectional view for explaining a deformation surface at a portion corresponding to Fig. 8C. [Figure 9] 9A and 9B are partially enlarged plan views schematically showing an example of the lid according to the second embodiment. [Figure 10] Fig. 10A is a plan view showing one embodiment of a container with a lid, and Fig. 10B is a cross-sectional view schematically showing the state of a vertical cross section taken along line GG in Fig. 10A. DETAILED DESCRIPTION OF THE INVENTION

[0011] The lid according to the present invention will be described in detail below with reference to the drawings. The lid will be described using an example of a lid used for a container (cup) for holding various beverages, such as a coffee cup. However, the lid is not limited to a lid for a container for holding beverages, and can also be applied to a container for holding food products other than beverages, such as liquid-containing food products. The lid according to the present invention can also be applied to containers that can hold various items other than food and beverages, such as parts such as bolts and nuts, or items other than those mentioned above. Furthermore, while the lid according to the present invention will be described below using an example in which the shape of the lid is circular when viewed in plan, the shape of the lid is not limited to a circular shape when viewed in plan, and can be applied to various shapes other than circles, such as ellipses, polygons such as rectangles and triangles, chamfered rectangles, chamfered polygons, and the like.

[0012] The following describes the lid body related to the present invention and examples of application of the lid body. The following description will be given in order with reference to the drawings. In this specification and the drawings, components having substantially the same functions are designated by the same reference numerals, and redundant description will be omitted.

[0013] The present invention will be described in the order of a first embodiment, a second embodiment, and an application example. However, the following descriptions are preferred specific examples of the present invention, and the content of the present invention is not limited to these embodiments.

[0014] In the following description, for convenience of explanation, directions such as front-back, left-right, and up-down, as well as directions on a horizontal plane, are shown, but the content of the present invention is not limited to these directions. In the examples of Figures 1 to 10, 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-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 with the Z-axis direction as the normal, are shown as the X-axis and Y-axis directions, and the XY plane, which is the plane defined by the X-axis and Y-axis, is shown as a horizontal plane. The explanation will be based on these. The relative magnitude ratios of sizes, etc. shown in Figures 1 to 10 are shown for convenience and do not limit the actual magnitude ratios unless otherwise specified.

[0015] [1 First embodiment] [1-1 Configuration] The lid 1 according to the first embodiment has a lid main body (main body 3). The main body 3 is formed so as to be bondable to the container main body 110 of a container 101 having a container main body 110 via an adhesive material 2. As shown in FIGS. 10A and 10B, the container main body 110 has an opening 102 formed at the upper end and a rim 103 forming the outer periphery of the opening 102. FIGS. 10A and 10B are a perspective view and a cross-sectional view (and a partially enlarged view) showing an example of a lid-equipped container 150 in which the lid 1 shown in FIGS. 1A to 1C is bonded to the container 101. The lid 1 can be used by being bonded along the rim 103. In the lid 1, the region bonded to the rim 103 in a plan view of the lid 1 is referred to as a bonding region R. FIGS. 1A and 1C are a plan view and a bottom view showing one example of the lid 1. FIG. 1B is a cross-sectional view showing the state of the vertical cross section taken along line AA in FIG. 1A. It is more preferable to use a container 101 that has flexibility at the edge 103 of the opening 102. However, this does not prohibit the container 101 from being a container that has little or no flexibility, such as a metal container.

[0016] In the example of FIGS. 1A to 1C, 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] In this specification, assuming that the main body 3 and the container body 110 are joined via the adhesive substance 2, the surface of the main body 3 that faces the container 101 is referred to as the facing surface 73 (the surface facing the container 101 when the container 150 is equipped with a lid), and the surface opposite the facing surface 73 is referred to as the exposed surface 72 (the surface exposed to the outside when the container 150 is equipped with a lid).

[0018] In addition to the main body 3, for other components such as the lid body 1 and the lid area corresponding portion 5B, the surfaces facing in the same direction as the exposed surface 72 may be referred to as exposed surfaces, and the surfaces facing in the same direction as the opposing surface 73 may be referred to as opposing surfaces.

[0019] (Main body) The main body 3 has a paper-based substrate 4 having a plurality of paper fibers 6A as the fibers 6. Having a paper-based substrate 4 means including the paper-based substrate 4 or being formed from the paper-based substrate 4. From the viewpoint of ensuring that the paper fibers 6A are exposed on the surface, it is preferable that the main body 3 be formed from the paper-based substrate 4. The main body 3 can be obtained, for example, by manufacturing a blank material by forming (processing) a sheet made of the paper-based substrate 4 into a predetermined shape.

[0020] (fiber) The fibers 6 refer to structures that can be recognized as having an elongated shape when observed in a plan view of the paper-based substrate 4 using an electron microscope or optical microscope at a magnification of about 50 times.

[0021] (Paper base material) The paper substrate 4 is preferably a sheet having a plurality of paper fibers 6A as the fibers 6. The paper fibers 6A refer to fibers formed from pulp. "Pulp" includes pulp fibers and fibers made from pulp (e.g., recycled fibers). The paper substrate 4 may be composed solely of paper fibers or may contain fibers such as non-pulp natural fibers, synthetic fibers, and recycled fibers. However, it preferably contains 50% or more by mass of paper fibers, more preferably 70% or more by mass, and even more preferably 80% or more by mass, and particularly preferably 100% by mass of paper fibers. The paper substrate may also be a composite material containing not only paper fibers but also nonwoven fabrics, wood-based materials such as wood foil, and even aluminum foil. However, when a composite material is used, it is preferable that the composite material contains 50% or more by mass of paper fibers as a whole, and particularly preferably 80% or more by mass of paper fibers. A higher paper fiber content is preferable because it increases the biodegradability of the paper substrate 4.

[0022] It is preferable that the main body 3 and the paper-based substrate 4 do not contain various resins, but the inclusion of various resins such as polyethylene resins is not completely prohibited. However, if the main body 3 or the paper-based substrate contains various resins, from the viewpoint of reducing the environmental impact, the mass ratio of the various resins to the total mass of the lid 1 is preferably less than 1 mass%, and more preferably 0.8 mass% or less. The various resins may be present only inside or on the surface of the paper-based substrate 4, or may be present both inside and on the surface of the paper-based substrate 4. Furthermore, even if the main body 3 or the paper-based substrate 4 contains various resins, it is preferable to select biodegradable resins, which pose fewer environmental pollution problems, from among the various resins. Biodegradable resins include, for example, microbially produced biodegradable resins such as polyhydroxyalkanoates (PHAs) and PHA-based copolymers; natural product-based biodegradable resins such as cellulose derivatives such as cellulose acetate and starch-based resins made primarily from starch such as corn starch; lactic acid-based resins such as polylactic acid (PLA), polylactic acid / polycaprolactone copolymers, and polylactic acid / polyether copolymers; succinate-based resins such as polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), and polyethylene terephthalate succinate (PETS); chemically synthesized biodegradable resins such as polycaprolactone and polyvinyl alcohol (PVA); and other biodegradable resins such as polyglycolic acid (PGA), polybutylene adipate / terephthalate, and biodegradable polyolefins (product name: Biorecover, product name: Cra Drop, etc.).

[0023] In the lid body 1, the main body 3 has a joining area corresponding portion 5A corresponding to the joining area R defined as the area to be joined to the container 101 along the edge 103 of the container 101, and a lid area corresponding portion 5B configured from the portion inward from the joining area corresponding portion 5A (the side toward the central position (center CT) in FIG. 1A etc.). As shown in FIG. 1A etc., the main body 3 may have an outer area corresponding portion 5C defined as the portion outside the lid area corresponding portion 5B.

[0024] (Part corresponding to the joining area) As described above, the joining region corresponding portion 5A is a portion of the lid 1 corresponding to the region that is joined to the container 101 along the edge 103 of the container 101. That is, the joining region corresponding portion 5A is a portion of the lid 1 that corresponds to the joining region R (the region facing the edge 103 of the container 101 and that is joined to the container 101). In the lid-equipped container 150, the joining region corresponding portion 5A is a portion of the lid 1 that forms the joining portion 151 between the lid 1 and the container 101. Specifically, in a plan view of the lid 1 (in the example of FIG. 1, the line of sight is the Z-axis (vertical direction)), the portion that forms the joining region R is defined as the joining region corresponding portion 5A. The joining region corresponding portion 5A is usually formed in an annular shape as shown in FIG. 1. In particular, when the edge 103 of the container 101 is formed in a roughly annular shape as shown in FIG. 1A, the joining region R becomes annular, and the joining region corresponding portion 5A also becomes roughly annular in a plan view of the lid 1. The outer edge of the joining area corresponding portion 5A is determined according to the position of the outer edge of the joining area R. The outer edge of the joining area corresponding portion 5A may be located on the outer peripheral edge of the lid 1 (in which case the joining area corresponding portion 5A and the outer area corresponding portion 5C coincide), or may be located inside the outer peripheral edge of the lid 1 as shown in the example of FIG. 1. When the joining area R between the lid 1 and the container 101 is not formed continuously, the portion sandwiched between adjacent joining areas R and facing the edge portion 103 is also included in the joining area corresponding portion 5A described below.

[0025] (Corresponding to the lid area) The lid region corresponding portion 5B is a portion that covers the opening 102. In the example of FIG. 1A, the lid region corresponding portion 5B is the portion of the lid 1 that is inward from the joining region corresponding portion 5A. The lid region corresponding portion 5B is the portion that covers the opening 102 in the lid-equipped container 150. Note that the portion that covers the opening 102 is the portion that covers at least a portion of the opening 102, and includes the case where it has a portion that can be partially opened, such as an insertion port 19, as will be described later.

[0026] (Outer area corresponding part) As shown in the example of FIG. 1A, the portion of the lid 1 outside the lid region corresponding portion 5B is the outer region corresponding portion 5C, which is the same portion as the joining region corresponding portion 5A or a portion including the joining region R.

[0027] (Surface attachment part) In the examples of FIGS. 1A to 1C, 2A, and 2B, the lid 1 has a surface attachment portion 13 provided on the surface 3A of the main body 3. In the examples of FIGS. 1A to 1C, the surface of the main body 3 on which the surface attachment portion 13 is provided is the opposing surface 73. The main body 3 has a paper-based substrate 4, and the surface attachment portion 13 is provided on the surface of the paper-based substrate 4 (the surface on the opposing surface 73 side in the example of FIG. 1). In the lid 1, the surface attachment portion 13 is provided on the surface of the paper-based substrate 4 in at least a portion corresponding to the lid region corresponding portion 5B (on the fibers 6 arranged on the surface of the paper-based substrate 4). The lid region corresponding portion 5B is required to be water-repellent, and therefore the provision of the surface attachment portion 13 improves the water-repellency of the lid region corresponding portion 5B. In the lid 1, the surface attachment portion 13 is also provided on the surface of the portion corresponding to the joining region corresponding portion 5A from the viewpoints of improving water-repellency and maintaining heat-sealability. When the contents contained inside the container 101 of the lid-equipped container 150 are liquid, the liquid may come into contact with the inner peripheral edge of the joining area corresponding portion 5A (near the boundary between the lid area corresponding portion 5B and the joining area corresponding portion 5A), and therefore the joining area corresponding portion 5A is also required to have a certain degree of water repellency. The joining area corresponding portion 5A is also required to have heat-sealability. In the lid 1 according to the first embodiment, the surface attachment portion 13 is arranged, and as will be described later, the pressing force applied to the lid 1 during heat sealing exposes part of the fibers 6 covered by the surface attachment portion 13. This allows the adhesive, the resin constituting the resin layer 120 (resin coating layer), etc. to come into contact with the exposed fibers, improving the adhesion between the container 101 and the lid 1.

[0028] As shown in Fig. 2A, the surface-attached portion 13 is defined as a portion where a non-synthetic resin-based water-repellent compound is attached to fibers 6 arranged on at least one surface of the paper-based substrate 4. In other words, the surface-attached portion 13 is a portion of the non-synthetic resin-based water-repellent compound attached to the surface 3A of the main body 3 (the opposing surface 73 in the example of Fig. 2A). In the examples of Figs. 1 and 2, the surface-attached portion 13 is a portion having a water-repellent compound attached to at least a portion of the fibers 6 arranged on the opposing surface 73 side of the paper-based substrate 4.

[0029] (water repellent compound) The water-repellent compound forming the surface-attached portion 13 is a non-synthetic resin-based compound. It is preferable to use a non-synthetic resin-based organic compound as the water-repellent compound. A non-synthetic resin-based water-repellent compound is defined as a water-repellent compound excluding petroleum-based synthetic resins. Petroleum-based synthetic resins refer to resins whose carbon source is petroleum. Therefore, a non-synthetic resin-based water-repellent compound may be a resin whose carbon source is not petroleum, such as a plant, or may be a plant-based biodegradable resin. A non-synthetic resin-based water-repellent compound is preferably a water-repellent compound having a molecular weight of approximately 10,000 or less, and biodegradable organic compounds are particularly preferred. Furthermore, a non-synthetic resin-based water-repellent compound derived from a plant material is also preferable. An example of a plant-based water-repellent compound is a compound derived from vegetable oil. Examples of water-repellent compounds having a molecular weight of approximately 10,000 or less include waxes.

[0030] Waxes include paraffin wax with a molecular weight of approximately 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, functional wax, Fischer-Tropsch wax, (isostearate / beeswax / succinic acid) castor oil, urushi peel wax, barley malt wax, etc. Shell wax, octyldodecyl beeswax, orange peel wax, hydrolyzed beeswax, candelilla wax hydrocarbon, daffodil flower wax, synthetic beeswax, synthetic Japan wax, dimethiconol beeswax, dimethicone copolyol beeswax, sweet acacia flower wax, hydrogenated rice bran wax, hydrogenated microcrystalline wax, hydrogenated Japan wax, stearyl beeswax, shellac wax, rosa centifolia flower wax, jasmine flower wax, bitter orange flower wax, damask rose flower wax, chu -Velvet flower wax, pelargonium graveolens wax, propolis wax, behenyl beeswax, Helichrysum angustifolium wax, jojoba wax, mastic leaf wax, acacia mimosa flower wax, acacia mimosa leaf wax, apple peel wax, rosemary flower wax, Jasmine flower wax, orange flower wax, candelilla wax extract, black currant bud wax, white bayberry fruit wax, violet leaf wax, acacia dealbata flower wax, rubus fruticosus leaf wax, lavender Examples of waxes that can be used include dandelion flower wax, synthetic wax, microcrystalline wax, rice bran wax, montan wax, microcrystalline wax, mink wax, candelilla wax esters, wild rose flower wax, bishydroxyethoxypropyl dimethicone beeswax esters, salvia sambac flower / leaf / stem wax, dimethicone PEG-8 beeswax, sunflower seed wax, jasmine flower wax, tulip tree leaf wax, and ormenis multicaulis flower wax, but biodegradable waxes are preferred.

[0031] In addition to the above, waxes that contain compounds having hydrophilic groups, such as PEG-6 beeswax, PEG-12 beeswax, sorbeth-2 beeswax, sorbeth-6 beeswax, sorbeth-8 beeswax, sorbeth-20 beeswax, bis-PEG-12 dimethicone beeswax, jojoba wax PEG-80, jojoba wax PEG-120, polyglyceryl-3 beeswax, beeswax fatty acid Na, PEG-6 sorbitol beeswax, PEG-8 sorbitol beeswax, PEG-20 sorbitol beeswax, PEG-8 beeswax, and PPG-5 lanolin wax (hereinafter referred to as waxes (A)), may also be used. However, from the viewpoint of adequately exhibiting water repellency, it is preferable that waxes (A) are used in combination with waxes outside the scope of these waxes (A).

[0032] (Layout of surface attachment part) In the examples of FIGS. 1A to 1C, 2A, and 2B, the surface attachment portion 13 is composed of multiple attachment portions 13A. In FIGS. 2A and 2B, the multiple attachment portions 13A are depicted as attachment portion 13A1, attachment portion 13A2, attachment portion 13A3, attachment portion 13A4, attachment portion 13A5, attachment portion 13A6, attachment portion 13A7, and attachment portion 13A8. Regarding the layout of the formation areas of the attachment portions 13A on the surface 3A of the main body 3 (i.e., the layout of the formation areas of the attachment portions 13A on the surface of the paper-based substrate), in the examples of FIGS. 1A, 1B, 2A, and 2B, the attachment portions 13A are spaced apart from one another in the planar direction of the surface 3A, i.e., dispersed on the surface of the surface 3A (distributed across the area of ​​the surface 3A). The attachment portions 13A may be formed as portions in which the water-repellent compound is attached to individual fibers 6, or may be formed as portions in which the water-repellent compound is attached to multiple fibers 6. 1A, 1B, 2A, and 2B, the attachment portion 13A forming the surface attachment portion 13 includes both a portion attached to one fiber 6 and a portion attached to multiple fibers 6. However, this does not necessarily mean that the attachment portion 13A must include only either a portion attached to one fiber 6 or a portion attached to multiple fibers 6.

[0033] (Surface of surface attachment part) As shown in FIGS. 3A and 3B , the lid 1 of the first embodiment is configured such that, when a pressing force is applied to the surface attachment portion, the surface of the surface attachment portion 13 becomes a deformed surface α, which is the surface after the application of the pressing force, depending on the magnitude of the applied pressing force. In this case, a recess 17 is formed in the deformed surface α. FIG. 3A is a cross-sectional view illustrating an example of the surface of the surface attachment portion 13 before the application of the pressing force, and FIG. 3B is a cross-sectional view illustrating an example of the deformed surface α, which is the surface of the surface attachment portion 13 after the application of the pressing force. The deformed surface α is formed by the application of the pressing force to the surface attachment portion 13. One method of applying the pressing force is to press the main body 3 of the lid 1 against the edge 103 of the container 101. If the lid 1 is heated at this time, this is similar to the so-called heat sealing method. When a pressing force is applied to the surface-attached portion 13, a fractured portion 14 (a portion where fracture, fracture, or crack exists, and is defined as a concept including cracked portions) is generated in the surface-attached portion 13 as a portion where a crack or the like has occurred. This fractured portion 14 may also serve as a recess 17. Furthermore, heat may be applied to the surface-attached portion 13 when applying the pressing force. In this case, the surface-attached portion 13 is further heated, softening the surface-attached portion 13 and / or melting a portion of the surface-attached portion, and the water-repellent compound constituting the surface-attached portion flows into the fractured portion. At this time, the fractured portion may not be completely sealed, but may be partially filled. Such a structure in which the fractured portion 14 is partially sealed may be defined as a recess 17. The depth position (bottom position) of the recess 17 may remain within the surface-attached portion 13, or may reach the surface of the fiber 6 that forms the base surface to which the surface-attached portion 13 is bonded, as described below.

[0034] When the depth position of the recess 17 reaches the surface of the fibers 6, it is preferable that the fibers 6 are exposed at the recess 17. That is, as shown in FIG. 3C , when the surface of the surface-attached portion 13 becomes the deformed surface by applying a pressing force to the surface-attached portion 13, at least a portion of the area of ​​the paper-based substrate covered by the surface of the surface-attached portion may be exposed before the application of the pressing force. In FIG. 3C , a crack (crack) is generated in the surface-attached portion 13 in the thickness direction of the surface-attached portion 13, reaching the fibers, thereby forming the broken portion 14. However, the broken portion 14 also serves as the recess 17, with the water-repellent compound constituting the surface-attached portion prevented from flowing into the broken portion 14. As a result, the fibers 6 of the paper-based substrate 4 are exposed at the bottom of the broken portion 14 (the bottom of the recess 17). The broken portion 14 is a portion formed in the area covered by the surface of the surface-attached portion 13 before the application of the pressing force. 3C, at least a portion of the area of ​​the paper-based substrate 4 covered by the surface of the surface-attaching portion 13 is exposed before the application of the pressing force. The surface area of ​​the paper-based substrate 4 covered by the surface of the surface-attaching portion 13 before the application of the pressing force and the surface area of ​​the paper-based substrate 4 exposed after the application of the pressing force is referred to as the modified exposed area (modified exposed area NA). The formation of the modified exposed area NA is not limited to that accompanying the formation of the broken portion 14 described above. As shown in FIG. 4B, the surface-attaching portion 13 dissolves, and the formation area of ​​the surface-attaching portion 13 (the formation area of ​​the attachment portion 13A) diffuses and / or deforms in the surface direction of the surface of the main body 3 (in the example of FIGS. 3A and 3B, the surface direction of the opposing surface 73), exposing at least a portion of the area covered by the surface-attaching portion 13, thereby forming the modified exposed area NA.

[0035] There are no particular limitations on the shape or layout of the break portion 14. As shown in Fig. 4A, the break portion 14 may be formed so that the break portion 14 extends inward from the outer edge of the surface attachment portion 13, or may be formed inside the surface attachment portion 13, or may be formed so as to divide the surface attachment portion 13.

[0036] From the viewpoint of facilitating the formation of the fractured portions 14, it is preferable that the surface of each attachment portion 13A forming the surface attachment portion 13 (the surface of the attachment portion 13A before the application of the above-described pressing force) has a curved surface component 25 having a protrusion 15A and a depression 15B, as shown in FIG. 3A . In this case, when a pressing force is applied to the surface of the surface attachment portion 13, the force applied to the attachment portion 13A becomes non-uniform, causing distortion inside the attachment portion 13A (making the curved surface component 25 more likely to break), thereby creating a state in which the fractured portions 14 are more likely to occur at predetermined portions of the attachment portion 13A. From the same viewpoint (from the viewpoint of facilitating the formation of the fractured portions 14), it is also preferable that the thickness of the attachment portion 13A is non-uniform. In this case, too, when a pressing force is applied to the surface of the surface attachment portion 13, it is possible to create a state in which the fractured portions 14 are more likely to occur at predetermined portions of the attachment portion 13A.

[0037] (non-placement area) In the first embodiment, when the surface of the main body 3 on which the surface attachment portion 13 is arranged (provided) is taken as the arrangement surface, there is a non-arrangement area EXF on the arrangement surface where the arrangement of the surface attachment portion is avoided, and the fibers 6 are exposed in the non-arrangement area EXF. In the example of Figures 2A and 2B, the arrangement surface is the opposing surface 73, and the surface attachment portion 13 is arranged on the opposing surface 73 side of the surface of the main body 3, and there is a non-arrangement area EXF on the opposing surface 73 side of the lid 1 where the arrangement of the surface attachment portion 13 is avoided. In the non-arrangement area EXF, the fibers constituting the paper-based substrate 4 that forms the main body 3 are exposed. Here, "exposed fibers" means that the fibers of the paper-based substrate are not covered by the surface attachment portion.

[0038] (adhesive substance) The adhesive substance 2 is a substance capable of bonding the main body 3 and the container body 110 together. Examples of the adhesive substance 2 include resins such as thermoplastic resins and adhesives. The adhesive substance 2 is more preferably a resin layer 120 (resin coating layer) pre-formed on the container body. However, this does not prohibit the adhesive substance 2 from being a substance interposed between the main body 3 and the container body 110, separate from the main body 3 and the container body 110. Generally, a thermoplastic resin such as polyethylene is often used as the resin layer 120. When the adhesive substance 2 is a resin layer 120 (resin coating layer) pre-formed on the container body, the resin layer 120 can bond the lid 1 and the container 101 when the lid 1 and the container 101 are bonded together by a heat sealing method. In other words, the resin layer 120 can function as the adhesive substance 2.

[0039] [1-2 Actions and Effects] When a lid made from a paper-based base material 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, so there is a demand for a method that makes it possible to bond the container and lid using a heat sealing method even if the types of resins that make up the resin coating layer formed on the surface of the container are diversified.

[0040] In conventional paper-based materials, water resistance has been imparted to the paper-based material by forming a resin layer on the surface of the base material using so-called plastic as the 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 a lid is manufactured using a paper-based material, it may be difficult to heat-seal the lid to the container.

[0041] Furthermore, when the lid is manufactured using a material in which a resin layer is formed on the surface of a base material using plastic as the material, the use of plastic causes problems of environmental load.

[0042] The lid body 1 of the first embodiment can be bonded to the container by bonding a resin coating to the resin that makes up the paper-based base material 4, so it is possible to omit the formation of a resin layer for bonding to the container, thereby eliminating the problem of environmental impact.

[0043] The lid 1 according to the first embodiment also has a surface-attaching portion 13 on the corresponding-to-joining-area portion 5A. When the contents contained in the container with the lid are liquid, the liquid may come into contact with the inner periphery of the corresponding-to-joining-area portion 5A (near the boundary between the corresponding-to-lid-area portion 5B and the corresponding-to-joining-area portion 5A). Therefore, the corresponding-to-joining-area portion 5A is also required to have a certain degree of water repellency. The corresponding-to-joining-area portion 5A is also required to have heat-sealability. In the lid 1 according to the first embodiment, the surface-attaching portion 13 is also provided on the corresponding-to-joining-area portion 5A, thereby improving the water repellency around the inner periphery of the corresponding-to-joining-area portion 5A. Furthermore, in the lid 1 according to the first embodiment, the surface of the surface-attaching portion 13 becomes a deformed surface α having a recess 17 due to the pressing force and heat applied to the lid 1 during heat sealing, as described below. Therefore, the adhesive, the resin constituting the resin coating layer (resin layer 120), and the like flow into the recess 17, thereby increasing the contact area between the resin and the surface-attaching portion 13. Even when the adhesive strength between the resin, etc. and the surface attachment portion 13 is weak, the contact area between the resin, etc. and the surface attachment portion 13 is enlarged, so that the entire surface attachment portion 13 can be firmly adhered to the resin, etc. Furthermore, when the modified exposed area NA is formed, part of the fibers 6 covered by the surface attachment portion 13 in the paper-based substrate 4 is exposed during heat sealing, so that the adhesive, the resin constituting the resin coating layer, etc. can come into contact with the exposed fibers 6, and the adhesive strength between the fibers and the resin, etc. improves the adhesion between the container and the lid.

[0044] [1-3 Variations] (Variation 1) The cover 1 according to the first embodiment may be processed as appropriate. Examples of the processing include adding a structure for imparting a function to the main body 3, or joining another member to the main body 3.

[0045] The lid 1 according to the first embodiment may be formed with a socket 19, as shown in FIGS. 5A and 5B, for example. An example of a lid configured in this manner is referred to as Variation 1 of the first embodiment. FIGS. 5A and 5B are a plan view and a cross-sectional view, respectively, that schematically show an example of the lid 1 according to Variation 1 of the first embodiment. FIG. 5B is a view that schematically shows the state of the vertical cross section taken along line CC in FIG. 5A.

[0046] (Outlet) The insertion port 19 is a structural portion that allows various members to be inserted into the container 101 from the outside when the lid 1 is used as a lid-equipped container 150. Examples of insertable members include a straw. The insertion port 19 is formed at least in the lid region corresponding portion 5B, and in the example of FIGS. 5A and 5B, it is formed as a through-hole. The through-hole has a structure (a penetrating structure) cut in the vertical direction (thickness direction, Z-axis direction) from one surface (exposed surface 72) of the main body 3 to the other surface (opposing surface 73), and is a so-called cut portion 18. Note that this through-hole can function as a gas vent. Here, the gas vent refers to a portion that allows gas to pass from one surface side of the lid 1 to the other surface side (from the opposing surface 73 side to the exposed surface 72 side).

[0047] (Variation 2) 6A to 6C, in the lid body 1 according to the first embodiment, the surface attachment portion 13 may be arranged on both sides of the main body 3 (i.e., both the facing surface 73 and the exposed surface 72). Therefore, the surface attachment portion 13 may be arranged on both sides of the paper-based substrate 4.

[0048] (Variation 3) As shown in FIGS. 7A to 7C, the lid 1 according to the first embodiment may be provided with an inner attachment portion 20 in addition to the surface attachment portion 13. The inner attachment portion 20 is defined as a portion where a non-synthetic resin-based water-repellent compound is disposed inside the main body 3 (i.e., between the opposing surface and the exposed surface). Therefore, in the lid 1 according to the third modification of the first embodiment, the non-synthetic resin-based water-repellent compound is attached to the fibers that make up the inside of the paper-based base material 4. The non-synthetic resin-based water-repellent compound that makes up the inner attachment portion 20 may be the same as the water-repellent compound that makes up the surface attachment portion 13.

[0049] [2 Second embodiment] [2-1 Configuration] As shown in FIGS. 8A to 8C , the cover 1 according to the second embodiment has a surface-attached portion 13 forming a layer 21. The layer 21 has an uneven thickness so that a depression is formed on the deformed surface when a pressure is applied to the surface-attached portion. Regarding the other configurations shown in FIGS. 8A to 8C , the cover 1 according to the second embodiment has the same configuration as the first embodiment, and all of the descriptions of the first embodiment may be applied. The definitions and configurations of the deformed surface and depression are the same as those described in the first embodiment, so a description thereof will be omitted. In the example shown in FIG. 8C , the layer 21 has a curved surface-forming portion 25 having a protrusion 15A and a depression 15B, and the surface of the layer 21 forms a curved surface. By forming the curved surface-forming portion 25 having the protrusion 15A and the depression 15B on the layer 21, when a pressure is applied to the layer 21, a depression 17 or a fractured portion 14 is likely to be formed on the deformed surface α as shown in FIG. 8D . FIG. 8D is a cross-sectional view illustrating the deformed surface α at a portion corresponding to FIG. 8C .

[0050] Alternatively, the surface-attached portion 13 may form a layer 21, and when a pressing force is applied to the layer 21, a breakage portion 14 may be generated in the layer 21. As shown in the example of Figure 8D, the breakage portion 14 may be configured to expose at least a portion of the surface of the fibers. In Figure 8D, the formation of the deformed surface α causes the surface of the paper-based substrate 4 to be uncovered by the surface-attached portion 13, forming a region (modified exposed region NA) where a portion of the fibers 6 (for ease of explanation, the illustration of the fibers 6 is omitted in Figures 8A to 8D) is exposed.

[0051] In the lid 1 according to the second embodiment, the layer 21, which is the surface attachment portion, may be formed so as to entirely cover at least one surface 3A of the main body 3. Alternatively, as shown in FIG. 9, the layer 21 may have a structure in which the attachment portions described in the first embodiment are interconnected and integrated. In this case, an area (non-arrangement area EXF) is formed on the surface 3A of the main body 3 in plan view, where the formation of the surface attachment portion 13 is avoided.

[0052] The layer 21 is formed so that its thickness is non-uniform. In this case, in the lid 1 according to the second embodiment, when a pressing force is applied to the layer 21, a broken portion 14 is likely to occur in the layer 21 (i.e., a recess 17 is likely to occur). The broken portion 14 is defined as a portion where the layer 21 is broken in the thickness direction of the layer 21 from the surface of the layer 21 to the surface of the fibers 6. In the second embodiment, as in the first embodiment, it is preferable that the formation of the broken portion 14 exposes at least a portion of the surface of the fibers 6 at a position deep inside the broken portion 14. As in the first embodiment, a pressing force can be applied to the layer 21 by, for example, placing the lid 1 so that the layer 21 faces the container 101 and pressing the lid 1 against the edge 103 of the container 101.

[0053] [2-2 Actions and Effects] According to the lid 1 of the second embodiment, the same effects as those of the first embodiment can be obtained.

[0054] [3 Application Examples] The lid 1 described above can be used in a lidded container 150 as shown in Figures 10A and 10B. Figure 10A is a perspective view showing an embodiment in which the lid 1 is joined to a rim 103 that forms the outer periphery of an opening 102 of a container 101 having an opening 102 formed at the top end. Figure 10B is a cross-sectional view that schematically shows the state of the vertical cross section of Figure 10A. The explanation of the lidded container 150 will continue with reference to Figures 10A and 10B.

[0055] (Container with lid) The lidded container 150 has a joint 151 where the container 101 and the lid 1 are joined, and the area of ​​the lid 1 where the joint 151 is formed is the joint area R. The method for joining the lid 1 and the container 101 is not particularly limited, and any joining method such as thermal fusion (heat sealing) can be used as appropriate. The following describes an example where the lid 1 according to the first embodiment is used in the lidded container 150.

[0056] The container 101 has a container body 110 having a cylindrical side wall 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 side wall 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 material stored inside the container 101 (space 105) is not particularly limited, and examples include liquid materials and combinations of liquid materials with solid materials.

[0057] 10A and other figures, the edge 103 of the opening 102 has a flange portion. The flange portion may be a curled portion 108 formed by outwardly winding a member forming the container body 110, or may be formed as a portion (a flange portion) extending outward on a plane.

[0058] In the container 101, the container body 110 preferably has a resin layer 120 formed on at least the surface of the rim 103. In the example of FIG. 4C , the resin layer 120 is formed over the entire area from the inner circumferential surface 106 of the container body 110 to the surface of the rim 103. In this case, the resin layer 120 is preferably a resin that can function as the adhesive substance 2. With this configuration, the resin layer 120 can function as the adhesive substance 2. That is, the lid can be attached to the container 101 by heat sealing or the like without applying a separate adhesive or the like to the container 101. Note that when the resin layer 120 is formed on the container body 110, it is sufficient that the resin layer 120 is formed on at least the surface of the rim 103; the resin layer 120 may be omitted from the inner circumferential surface 106 of the container body 110. The container body 110 may also be formed by processing a sheet material containing paper fibers. In such a case, as shown in FIG. 4B and other figures, the container body 110 contains fibers such as paper fibers.

[0059] The lid 1 may also be combined with a container 101 having an opening 102 .

[0060] The paper-based material and the lid using the paper-based material according to the present invention have been described in detail above, but the paper-based material and the lid according to the present invention are merely examples and are not limited to these. Therefore, appropriate modifications may be made within the scope of the present invention.

[0061] Based on the above description of this specification, the present invention may employ the following configurations [E1] to [E8]. [E1] A main body having a paper-based substrate having a plurality of fibers, a surface attachment portion is provided on the surface of the main body, the surface attachment portion being a portion in which a non-synthetic resin-based water-repellent compound is attached to the fibers arranged on at least one surface of the paper-based base material; When a pressing force is applied to the surface of the surface attachment portion, the surface of the surface attachment portion of the surface of the fiber is configured to become a deformed surface as the surface after the application of the pressing force depending on the magnitude of the applied pressing force, and a recess is formed on the deformed surface. Lid body. [E2] When the surface of the surface attachment portion becomes the deforming surface, at least a part of the region of the paper-based substrate covered by the surface of the surface attachment portion is exposed before the application of the pressing force. The lid described in [E1] above. [E3] When the surface of the main body on which the surface attachment portion is arranged is defined as an arrangement surface, a non-arrangement area where the surface attachment portion is not arranged exists on the front arrangement surface, and the fiber is exposed in the non-arrangement area. The lid according to [E1] or [E3] above. [E4] the surface attachment portion forms a layer, the thickness of the layer is non-uniform so that the recess is generated on the deformed surface when a pressing force is applied to the surface attachment portion; A lid according to any one of [E1] to [E3] above. [E5] When the surface of the surface attachment portion becomes the deforming surface, at least a part of the region of the paper-based substrate covered by the surface of the surface attachment portion is exposed before the application of the pressing force. The lid described in [E4] above. [E6] The lid according to any one of the above [E1] to [E5], wherein the water-repellent compound is a biodegradable organic compound. [E7] The lid according to any one of [E1] to [E6] above, wherein the water-repellent compound is an organic compound derived from plant materials. [E8] A container with a lid, comprising: a lid according to any one of [E1] to [E7] above; and a container having a container body having an opening formed at the upper end and an edge forming the outer periphery of the opening, wherein the lid is joined to the container. [E9] A resin coating layer is formed on the inner circumferential surface of the container body, The resin coating layer is further formed on the upper surface of the edge portion, The lid is bonded to the container via the resin coating layer. A container with a lid according to [E8] above. [E10] A combination of a lid and a container, comprising the lid described in any one of [E1] to [E7] above and a container having an opening formed at the top end and an edge forming the outer periphery of the opening. [Explanation of symbols]

[0062] 1: Lid 2:Adhesive substance 3: Main body 3A: Surface 4:Paper base material 5A: Joint area 5B: Lid area corresponding part 5C: Outer area corresponding part 6: Fiber 6A: Paper fiber 13: Surface attachment part 13A: Attached part 14: Breaking part 15A:Protrusion 15B: Depression 17: Recess 18: Notch 19: Outlet 20: Inner attachment part 21: layer 25: Curved surface component 72: Exposed surface 73: Opposite surface 101: Container 102: Opening 103: Edge 104: Side wall 105: Spatial part 106: Inner peripheral surface 107: Bottom 108: Curl section 110: Container body 120: Resin layer 150: Container with lid 151: Joint CT: Center EXF: Non-placement area NA: Change exposure range R: Junction area α: Deformation surface

Claims

1. A main body having a paper-based substrate having a plurality of fibers, a surface attachment portion is provided on the surface of the main body, the surface attachment portion being a portion in which a non-synthetic resin water-repellent compound is attached to the fibers arranged on at least one surface of the paper-based base material; When a pressing force is applied to the surface of the surface attachment portion, the surface of the surface attachment portion of the surface of the fiber is configured to become a deformed surface as the surface after the application of the pressing force depending on the magnitude of the applied pressing force, and a recess is formed on the deformed surface. Lid body.

2. When the surface of the surface attachment portion becomes the deforming surface, at least a part of the region of the paper-based substrate covered by the surface of the surface attachment portion is exposed before the application of the pressing force. The lid according to claim 1 .

3. When the surface of the main body on which the surface attachment portion is arranged is defined as an arrangement surface, a non-arrangement area where the surface attachment portion is not arranged exists on the front arrangement surface, and the fiber is exposed in the non-arrangement area. The lid according to claim 1 .

4. the surface attachment portion forms a layer, the thickness of the layer is non-uniform so that the recess is generated on the deformed surface when a pressing force is applied to the surface attachment portion; The lid according to claim 1 .

5. When the surface of the surface attachment portion becomes the deforming surface, at least a part of the region of the paper-based substrate covered by the surface of the surface attachment portion is exposed before the application of the pressing force. The lid according to claim 4.

6. The lid according to claim 1 , wherein the water-repellent compound is a biodegradable organic compound.

7. The lid according to claim 1 , wherein the water-repellent compound is an organic compound derived from plant materials.

8. A container with a lid, comprising: the lid according to claim 1; and a container having a container body having an opening formed at an upper end and an edge portion forming the outer periphery of the opening, wherein the lid is joined to the container.

9. A resin coating layer is formed on the inner circumferential surface of the container body, The resin coating layer is further formed on the upper surface of the edge portion, The lid is bonded to the container via the resin coating layer. The container with lid according to claim 8.

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

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