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

Abstract

To provide a lid body using a paper-based base material having heat sealability as a non-plastic-based base material, a container, and a combination of a lid body and a container.SOLUTION: A lid body is formed so as to be bondable to a container body having an opening at its upper end and an edge part forming its outer periphery through an adhesive substance, and has a bonded region corresponding part which includes a body of a paper-based base material having a plurality of paper fibers, and corresponds to a bonded region to be bonded to the edge part of the container, and a lid region corresponding part composed of the inside part of the bonded region corresponding part, wherein in a state in which the body and the container body are bonded to each other through the adhesive substance, when a surface opposite to the container among surfaces of the body is an opposite surface, and a surface contrary to the opposite surface is an exposure surface, the paper-based base material has such an overlap structure that the paper fibers overlap each other so that the adhesive substance enters toward a side closer to the exposure surface side than the paper fibers arranged on the surface of the paper-based base material, in a state in which the body is bonded to the container body through the adhesive substance, and a part of the overlapping structure of the paper-based base material is exposed to at least a part on the opposite surface side of the surface of the bonded region corresponding part.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, packaging components, such as containers such as cups and lids, have generally been made of plastic due to their cost and moldability. The environmental impact of plastics has become a problem. In particular, conventional synthetic plastics, such as petroleum-based synthetic resins, have been recognized as having the problem of not naturally decomposing after disposal and remaining in nature for long periods of time. To address this issue, the use of biodegradable plastics has been considered when using plastics as packaging materials. However, while biodegradable plastics are more naturally degradable than conventional synthetic plastics, there is a strong demand for cost improvements. In light of these issues, the use of paper-based materials as packaging materials has been considered as materials (non-plastic materials) that have a lower environmental impact than plastics. One example of a method for obtaining packaging components using paper-based materials is to obtain a blank from a paper-based substrate and then process the blank to obtain a packaging component. [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 packaging component is a lid and the lid is obtained by processing a blank material formed from a sheet (paper sheet) as a paper-based substrate, it is possible to form the lid from a sheet having resin layers formed on both sides to improve water resistance. However, since a resin coating layer is usually formed on the surface of the container as a resin layer to waterproof the container, depending on the resin material constituting the resin layer, adhesion with the resin constituting the resin coating layer may be impaired, making it difficult to bond the container and the lid by a sealing method. Therefore, there is room for improvement in terms of making it possible to bond the container and the lid by a heat sealing method even when the types of resins constituting the resin coating layer formed on the surface of the container are diversified.

[0005] One object of the present invention is to provide a lid, a container with a lid, and a combination of a lid and a container, which use a paper-based substrate having heat-sealability as a non-plastic material. [Means for solving the problem]

[0006] The present invention is summarized as follows: (1) to (6).

[0007] (1) A lid body, which is formed so as to be bondable to a container body via an adhesive material, the container body having an opening formed at an upper end and a rim that forms the outer periphery of the opening, and which has a paper-based substrate having a plurality of paper fibers as fibers, the body having a joining area corresponding to a joining area that is defined as an area to be joined to the container along the rim of the container, and a lid area corresponding to a portion inward from the joining area corresponding to the joining area, and assuming a state in which the body and the container body are bonded together via the adhesive material, and assuming that the surface of the body that faces the container is the opposing surface and the surface opposite the opposing surface is the exposed surface, the paper-based substrate has a layered structure in which the paper fibers are overlapped so that the adhesive material can penetrate toward the exposed surface beyond the paper fibers arranged on the surface of the paper-based substrate when the body is bonded to the container body via the adhesive material, and at least a portion of the layered structure of the paper-based substrate is exposed on at least a portion of the surface of the joining area corresponding to the opposing surface. (2) The lid body described in (1) above, wherein the overlapping structure of the paper-based substrate has a first fiber part composed of the fibers located on the exposed surface side, a second fiber part composed of the fibers located more inward along the thickness direction of the paper-based substrate than the first fiber part, and a space part formed between the first fiber part and the second fiber part, and when the main body is bonded to the container main body via the adhesive substance, the adhesive substance enters at least a part of the space part. (3) The overlapping structure of the paper-based substrate has a first fiber portion composed of the fibers located on the exposed surface side, and a second fiber portion composed of the fibers located on the opposing surface side along the thickness direction of the paper-based substrate relative to the first fiber portion, and the first fiber portion and the second fiber portion are connected, and a branched portion is formed between the first fiber portion and the second fiber portion. (4) A container with a lid, comprising the lid described in (1) above and a container having a container body with the opening formed at the top end, wherein the lid is joined to the container via the adhesive material. (5) A container with a lid described in (4) above, in which the container body has a resin layer formed on at least the surface of the edge portion, and the adhesive substance is a resin that constitutes the resin layer. (6) A combination of a lid and a container, comprising the lid described in (1) above and a container having a container body with an opening formed at the top end, wherein the container body has a resin layer formed on at least the surface of the edge, and the resin layer is a resin that can function as the adhesive substance. [Effects of the Invention]

[0008] According to the present invention, there are provided a lid, a container with a lid, and a combination of a lid and a container, which use a paper-based substrate having heat-sealability as a non-plastic material. [Brief explanation of the drawings]

[0009] [Figure 1] Fig. 1A is a plan view showing an example of a lid according to the first embodiment, and Fig. 1B is a cross-sectional view showing the state of a vertical cross section taken along line AA. [Figure 2] Fig. 2A is an enlarged cross-sectional view schematically showing an enlarged region XS1 surrounded by a dashed line in Fig. 1B. Fig. 2B is an enlarged cross-sectional view schematically showing an enlarged region XS2 surrounded by a dashed line in Fig. 2A. Fig. 2C is an enlarged plan view schematically showing an example of fiber intersection. [Figure 3] Fig. 3A is a perspective view showing one embodiment of a container with a lid, and Fig. 3B is a cross-sectional view schematically showing the state of a vertical cross section taken along line BB in Fig. 3A. [Figure 4] Fig. 4A is an enlarged cross-sectional view schematically showing an enlarged region XS3 surrounded by a dashed line in Fig. 4B, Fig. 4B is an enlarged cross-sectional view schematically showing an enlarged region XS4 surrounded by a dashed line in Fig. 4A, and Fig. 4C is an enlarged cross-sectional view schematically showing an enlarged region XA surrounded by a dashed line in Fig. 3B. [Figure 5]Fig. 5A is an enlarged cross-sectional view showing an example of a lid according to the first embodiment, Fig. 5B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the first embodiment, and Fig. 5C is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the second embodiment. [Figure 6] 6A and 6B are enlarged cross-sectional views illustrating an example of the lid according to the first embodiment. [Figure 7] Figures 7A, 7B, and 7C are enlarged cross-sectional views showing an example of the position of a receiving structure in the lid according to the first embodiment. Figure 3A is an enlarged cross-sectional view showing an example of a lid according to the second embodiment. Figure 3B is an enlarged cross-sectional view showing an example of a lid according to the third embodiment. Figure 3C is an enlarged cross-sectional view showing an example of a lid according to the fourth embodiment. [Figure 8] Fig. 8A is an enlarged cross-sectional view showing an example of a lid according to the third embodiment, and Fig. 8B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the third embodiment. [Figure 9] Fig. 9A is an enlarged cross-sectional view showing an example of a lid according to the fourth embodiment, and Fig. 9B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the fourth embodiment. [Figure 10] Fig. 10A is an enlarged cross-sectional view showing an example of a lid according to the fifth embodiment, and Fig. 10B is an enlarged cross-sectional view showing an example of a lidded container using the lid according to the fifth embodiment. [Figure 11] Fig. 11A is a plan view showing an example of the lid according to the first embodiment, and Fig. 11B is a cross-sectional view showing the state of a vertical cross section taken along line CC. [Figure 12] FIG. 1 is a diagram for explaining the results of Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. The lid according to the present invention will be described in detail 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 solids such as food in addition to beverages. The lid according to the present invention can also be applied to a container that can hold liquids other than food and beverages. Furthermore, the lid according to the present invention will be described below using an example in which the lid has a circular shape when viewed in plan. However, 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 a circle, such as an ellipse, a rectangle, a polygonal shape such as a triangle, a chamfered rectangle, a chamfered polygon, etc.

[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 of preferred specific examples 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-back, left-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 11 , 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 X-axis direction and the Y-axis direction are 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, 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 11 are shown for convenience and, unless otherwise specified, do not limit the actual magnitude ratios.

[0013] [1 First embodiment] [1-1. Structure] 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. 3A and 3B, the container main body 110 has an opening 102 formed at the upper end and an edge portion 103 forming the outer periphery of the opening 102. FIGS. 3A and 3B are perspective and cross-sectional views showing an example of a lid-equipped container 150 in which the lid 1 shown in FIGS. 1A and 1B is bonded to the container 101. The lid 1 can be used by being bonded along the edge portion 103. In the lid 1, the region bonded to the edge portion 103 in a plan view of the lid 1 is referred to as a bonding region R. FIG. 1A is a plan 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. Note that the container 101 preferably has a flexible edge portion 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.

[0014] 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.

[0015] 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).

[0016] 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.

[0017] (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.

[0018] (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.

[0019] (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.

[0020] 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 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 burden, the mass ratio of the resin to the total mass of the lid 1 is preferably less than 1 mass%, and more preferably 0.8 mass% or less. 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 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.).

[0021] In the lid body 1, the main body 3 has a joining area corresponding portion 5A that corresponds to the joining area R that is 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 that is configured from the portion inward from the joining area corresponding portion 5A (the side toward the center position CT in FIG. 1). As shown in FIG. 1, the main body 3 may have an outer area corresponding portion 5C that is defined as the portion outside the lid area corresponding portion 5B.

[0022] (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 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 corresponding to the joining region R (a region facing the edge 103 of the container 101 and 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 direction (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. 1, 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.

[0023] (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.

[0024] (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.

[0025] (receiving structure) Because the paper-based substrate 4 has a structure in which fibers 6 are layered, its surface may have a fine uneven structure 7 as shown in Fig. 2A. The paper-based substrate 4 has a receiving structure 8 in at least a part of the uneven structure 7 that allows the adhesive substance 2 to enter toward the exposed surface 72 side beyond the fibers 6 (fibers exposed on the opposing surface 73 side) arranged on the surface of the paper-based substrate 4 when the main body 3 is bonded to the container main body 110 via the adhesive substance 2.

[0026] An example of the receiving structure 8 is the overlapping structure 9. The receiving structure 8 such as the overlapping structure 9 can be formed by controlling the density, basis weight, and entanglement strength of the fibers 6 constituting the paper-based substrate 4 during the production of the paper-based substrate 4. The receiving structure 8 such as the overlapping structure 9 may also be formed by subjecting the surface of the paper-based substrate 4 (particularly the surface on the opposing surface 73 side) to a treatment that slightly roughens it.

[0027] (Superimposed structure) The paper base material 4 may have an overlapping structure 9 (an overlapping structure having non-adhered portions of fibers) defined as a structure in which the fibers 6 overlap (a structure in which at least a portion of the fibers 6 overlap in a plan view of the lid 1) so that the adhesive substance 2 can penetrate toward the exposed surface 72 side beyond the fibers 6 arranged on the surface of the paper base material 4 when the main body 3 is bonded to the container main body 110 via the adhesive substance 2. The overlapping structure 9 is formed, for example, at an intersection of fibers 6, 6 that intersect with a gap as shown in Fig. 2C, or in a portion where fibers 6, 6 that are partially in contact with each other gradually separate as shown in the example of Fig. 2B.

[0028] In the lid 1, as shown in FIG. 2B, at least a part of the overlap structure 9 of the paper-based base material 4 is exposed on at least a part of the surface of the bonding region corresponding portion 5A on the opposing surface 73 side.

[0029] (Distribution of Acceptance Structure) On the opposing surface 73, the receiving structures 8 are not limited to being concentrated in a portion of the bonded region corresponding portion 5A as shown in FIG. 7C, but may be present over substantially the entire area of ​​the bonded region corresponding portion 5A as shown in FIG. 7A (or may be present dispersedly over the entire surface of the bonded region corresponding portion 5A). The receiving structures 8 may also be present in at least a portion of the lid region corresponding portion 5B. The receiving structures 8 of the paper-based substrate 4 may also be present over substantially the entire area of ​​the lid region corresponding portion 5B as shown in FIG. 7B (or may be present dispersedly over the entire surface of the lid region corresponding portion 5B). In FIGS. 7A to 7C, the positions corresponding to the points indicated by symbols P1, P2, P3, P4, etc. indicate the positions of the receiving structures 8.

[0030] (Rising structure) The paper-based substrate 4 may have a raised structure 10 formed as a structure in which the fibers 6 stand up. The raised structure 10 is preferably formed so that, when the main body 3 is bonded to the container main body 110 via the adhesive substance 2, the adhesive substance 2 can penetrate further toward the exposed surface 72 than the fibers 6 arranged on the surface of the paper-based substrate 4.

[0031] In the lid 1, it is preferable that at least a part of the raised structure 10 of the paper-based base material 4 is exposed on at least a part of the surface of the bonding region corresponding portion 5A on the opposing surface 73 side.

[0032] The distribution of the raised structures 10, like the distribution of the receiving structures 8, is not limited to being concentrated in a part of the joining area corresponding portion 5A, but may be present over substantially the entire surface of the joining area corresponding portion 5A (or may be present dispersedly over the entire surface of the joining area corresponding portion 5A). The raised structures may also be present in at least a portion of the lid area corresponding portion 5B. The raised structures 10 of the paper-based substrate may be present not only in the joining area corresponding portion 5A but also over substantially the entire surface of the lid area corresponding portion 5B (or may be present dispersedly over the entire surface of the lid area corresponding portion 5B).

[0033] A part of the rising structure 10 may also serve as the above-described overlapping structure 9. Furthermore, the rising structure 10 may be connected to the above-described overlapping structure 9 depending on the positional relationship and shape of the first fiber portion 11 and the second fiber portion 12 described below. In the example of FIG. 5A , a predetermined portion BC on one end of the second fiber portion 12 forms the overlapping structure 9, and the predetermined portion BC and a predetermined portion FR on the other end form the rising structure 10. In a state in which the main body 3 is bonded to the container main body 110 via the adhesive substance 2, the rising structure 10 may be maintained as shown in FIG. 5B , or may be collapsed as shown in a second embodiment described below with reference to FIG. 5C .

[0034] 2B , the paper substrate 4 includes a first fiber portion 11 (fibers located more inward than a second fiber portion 12, which will be described later) made up of fibers 6 located on the exposed surface 72 side, and a second fiber portion 12 (fibers located on the surface of the paper substrate 4) made up of fibers located closer to the opposing surface 73 along the thickness direction of the paper substrate 4 than the first fiber portion 11. The fibers located on the surface of the paper substrate 4 (second fiber portion 12) rise obliquely (slightly toward the −Z direction) relative to the fibers (first fiber portion 11) located more inward than the second fiber portion 12 (a rising structure 10 is formed) (hanging diagonally downward in the drawing of FIG. 2B ), and the first fiber portion 11 and the second fiber portion 12 are at least partially overlapped in a plan view of the main body 3 (a superimposed structure 9 is formed). Therefore, the structure formed by the first fiber parts 11 and the second fiber parts 12 forms both the rising structure 10 and the overlapping structure 9.

[0035] In the example of Figure 2B, a gap 14 is formed between the first fiber part 11 and the second fiber part 12, and the gap 14 is large enough to allow the adhesive substance 2 to penetrate toward the exposed surface 72 side (the first fiber part 11 side in Figure 2B) beyond the fibers 6 (the second fiber part 12 in Figure 2B) arranged on the surface of the paper-based substrate 4 when the main body 3 is bonded to the container main body 110 via the adhesive substance 2.

[0036] In the example of Figure 2B, the first fiber part 11 and the second fiber part 12 are formed in one piece, but when the area where the gap 14 is formed is defined as an overlap area (indicated by the symbol OVL in Figures 6A and 6B) in a plan view of the lid body 1 (plan view of the main body 3), the first fiber part 11 and the second fiber part 12 may have multiple second fiber parts 12 located in the overlap area OVL, as shown in Figure 6B (in Figure 6B, 2-1 fiber part 12A, 2-2 fiber part 12B, and 2-3 fiber part 12C are formed as the second fiber part 12). Also, as shown in Figure 6A, the first fiber part 11 located in the overlapping area OVL may be made up of multiple fiber parts that form gaps 14 together with the second fiber part 12 (in Figure 6A, the first fiber parts 11 are made up of 1-1 fiber part 11A, 1-2 fiber part 11B, and 1-3 fiber part 11C).

[0037] (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.

[0038] (surface roughness) The paper-based substrate 4 preferably has a surface roughness (maximum height Rz) (μm) of a predetermined value or more in at least a portion of the joining region corresponding portion 5A. When the surface roughness varies across the surfaces of the paper-based substrate 4, it is preferable that the surface with the greater surface roughness forms the opposing surface 73. When a paper-based substrate 4 with a greater surface roughness is used to form the main body 3, when the main body 3 is joined to the container body 110 via the adhesive substance 2, the contact area between the adhesive substance 2 and the fibers 6 arranged on the surface of the paper-based substrate 4 can be increased, thereby increasing the joining strength between the lid 1 and the container 101.

[0039] [1-2 Actions and Effects] There has been a demand for improvements in the lid body in that it can be used to bond the container and lid body using a sealing method even if the types of resin that make up the resin layer formed on the surface of the container are diverse.

[0040] According to the lid body 1 of the first embodiment, the main body 3 of the lid body 1 is made of a paper-based base material 4. Therefore, when a heat sealing method is applied to attach the lid body 1 to the container 101, the resin constituting the resin layer 120 formed on the surface of the edge portion 103 of the container 101 penetrates toward the exposed surface 72 rather than the fibers 6 arranged on the surface of the paper-based base material 4, and can further bond to the fibers exposed in the overlapping structure 9 (e.g., the second fiber portion 12), thereby further improving the adhesion between the resin layer 120 and the lid body 1.

[0041] [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.

[0042] The lid 1 according to the first embodiment may be formed with a socket 19, as shown in Figs. 11A and 11B, for example. An example of a lid configured in this manner is referred to as Modification 1 of the first embodiment. Figs. 11A and 11B are a plan view and a cross-sectional view, respectively, that schematically show an example of the lid 1 according to Modification 1 of the first embodiment. Fig. 11B is a view that schematically shows the state of the vertical cross section taken along line CC in Fig. 11A.

[0043] (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. 11A and 11B, 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 notch 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).

[0044] (Variation 2) In the cover 1 according to the first embodiment, a predetermined area may be subjected to a water-repellent treatment (Modification 2).

[0045] (Water-repellent treatment) The water-repellent treatment applicable to the second modification of the first embodiment is not particularly limited, and examples thereof include a method of immersing the paper substrate 4 in a treatment liquid, removing the immersed paper substrate 4, and then drying it. Another example of the water-repellent treatment is a method of applying a treatment liquid to the surface of the paper substrate 4. Specific examples of application methods include printing methods. Examples of printing methods include coating methods such as roll coating and spray coating, gravure printing, and screen printing.

[0046] The treatment liquid may be a liquid containing a water repellent, such as a fluorine-based water repellent or wax.

[0047] [2 Second embodiment] [2-1. Structure] As shown in Fig. 5C, the lid 1 according to the second embodiment has the same configuration as that of the first embodiment, except that the second fiber portions 12 forming the raised structure 10 of the paper-based base material 4 are configured so that when the main body 3 is joined to the container main body 110 via the adhesive substance 2, the second fiber portions 12 bend toward the first fiber portions 11 to form the overlapping structure 9. Fig. 5C is an enlarged cross section for explaining an example of the second embodiment.

[0048] (Second fiber part) Before the main body 3 is bonded to the container body 110 via the adhesive substance 2, the second fiber portion 12 has a portion that rises in a direction away from the first fiber portion 11 (slightly in the -Z direction in FIG. 5A ) (a portion that hangs down diagonally in FIG. 5A ) as shown in FIG. 5A . When the main body 3 is bonded to the container body 110 via the adhesive substance 2, the second fiber portion 12 approaches the first fiber portion 11 as a whole, as shown in FIG. 5C , while a gap 14 remains between the first fiber portion 11 and the second fiber portion 12. When the main body 3 is bonded to the container body 110 via the adhesive substance 2, the first fiber portion 11 and the second fiber portion 12 form a superimposed structure 9. Furthermore, the size of the gap 14 formed between the first fiber part 11 and the second fiber part 12 is maintained at a size that allows the adhesive substance 2 to penetrate into the gap 14 both before and after joining the main body 3 to the container main body 110 via the adhesive substance 2.

[0049] [2-2 Actions and Effects] The lid according to the second embodiment provides the same effects as those of the first embodiment.

[0050] [3 Third embodiment] [3-1. Structure] As shown in Figures 8A and 8B, the lid 1 according to the third embodiment has the same configuration as that of the first embodiment, except that a space 15 is formed between the first fiber portion 11 and the second fiber portion 12 that form the rising structure 10 of the paper-based base material 4. Figures 8A and 8B are enlarged cross-sectional views for explaining an example of the third embodiment.

[0051] (Space part) The space 15 has an opening that can receive resin (such as the adhesive substance 2) from the outside. In the example of Fig. 8A, the opening is formed in the front-to-back direction of the paper on which the drawing is drawn, and in the plane direction of the paper, the space 15 is a closed space between the first fiber portion 11 and the second fiber portion 12. In the third embodiment, the size of the space 15 is such that the adhesive substance 2 can enter the space 15 from the opening when the main body 3 is joined to the container main body 110 via the adhesive substance 2.

[0052] [3-2 Actions and Effects] The lid according to the third embodiment provides the same effects as those of the first embodiment.

[0053] [4 Fourth embodiment] [4-1. Structure] 9A and 9B, the lid 1 according to the fourth embodiment has the same configuration as that of the first embodiment, except that the first fiber portions 11 and the second fiber portions 12 are connected and branched portions 16 are formed between the first fiber portions 11 and the second fiber portions 12. FIGS. 9A and 9B are enlarged cross-sectional views for explaining an example of the fourth embodiment.

[0054] (branching part) The branched portion 16 has an opening that can receive a resin (such as the adhesive substance 2) from the outside. In the example of FIG. 9A , one end of the gap 14 between the first fiber portion 11 and the second fiber portion 12 is open, and the other end of the gap 14 forms a portion (connecting portion 16A) where the first fiber portion 11 and the second fiber portion 12 are connected. The branched portion 16 also serves as the overlapping structure 9. In the third embodiment, the gap 14 between the first fiber portion 11 and the second fiber portion 12 formed in the branched portion 16, like the overlapping structure 9, is large enough to allow the adhesive substance 2 to enter into the gap 14 arranged on the surface of the paper-based substrate 4 when the main body 3 is joined to the container main body 110 via the adhesive substance 2.

[0055] [4-2 Actions and Effects] According to the cover of the fourth embodiment, the same effects as those of the first embodiment can be obtained.

[0056] [5 Fifth embodiment] [5-1. Structure] 10A and 10B, the lid 1 according to the fifth embodiment has the same configuration as the first embodiment except that a third fiber portion 13 is interposed between the first fiber portion 11 and the second fiber portion 12 that form the overlapping structure 9 of the paper-based substrate 4. In the fifth embodiment, the gap between the first fiber portion 11 and the third fiber portion 13 (first gap 14A) and the gap between the third fiber portion 13 and the second fiber portion 12 (second gap 14B) are both large enough that, when the main body 3 is bonded to the container main body 110 via the adhesive substance 2, the adhesive substance 2 can enter toward the exposed surface 72 side beyond the fibers 6 arranged on the surface of the paper-based substrate 4 (i.e., into the first gap 14A and the second gap 14B).

[0057] [5-2 Actions and Effects] According to the cover of the fifth embodiment, the same effects as those of the first embodiment can be obtained.

[0058] In the lid according to the present invention, the configurations shown in the first to fifth embodiments may be appropriately combined (may coexist), that is, in the lid according to the present invention, for example, the configuration of the first fiber part and the second fiber part shown in the first embodiment and the configuration of the first fiber part and the second fiber part shown in the second embodiment may coexist.

[0059] [6 Application Examples] The lid 1 described above can be used in a lidded container 150 as shown in Figures 3A and 3B. Figure 3A 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 3B is a cross-sectional view that schematically shows the state of the vertical cross section taken along the line in Figure 3A. The explanation of the lidded container 150 will continue with reference to Figures 3A and 3B.

[0060] (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.

[0061] 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.

[0062] 3A and the like, 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.

[0063] 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. Alternatively, the container body 110 may be formed by processing a sheet material containing paper fibers. In such a case, as shown in FIG. 4B, the body 110 contains fibers 121 such as paper fibers.

[0064] The lid 1 may also be combined with a container 101 having an opening 102 . [Example]

[0065] Example 1 A lid and a container as shown in Figure 1 were prepared, and a container with a lid was obtained using a heat sealing method. The container used had a container body formed by processing a sheet material containing paper fibers, with a continuous resin layer formed on the edge surface and the entire inner surface area (all areas). The container shape used was as shown in Figures 3A and 3B. The temperature during the heat sealing method was 200°C.

[0066] The bonded portion between the rim and the lid of the resulting lidded container was observed using an electron microscope (magnification: 100x). The results are shown in Figure 12. In Figure 12, symbol A1 indicates the container body of the container, and symbol B1 indicates the body of the lid. Symbol C1 indicates the resin layer, and symbol C2 indicates the resin that constitutes the resin layer. Symbols B2 and B3 indicate the first and second fiber portions, respectively, and symbol B4 indicates a gap. This confirmed that the resin C2 that constitutes the resin layer C1 had penetrated into the gap B4 between the fibers (first fiber portion B2 and second fiber portion B3) that constitute the lid, and that the resin layer C1 was functioning as an adhesive substance.

[0067] As explained above, the lid 1 according to the present invention can be applied to many of these lid body configurations. It can also be applied to lid body 1 configurations other than those described above. The lid according to the present invention has been described in detail above, but the above are merely examples of the lid according to the present invention and are not limited to these. Therefore, appropriate modifications may be made without departing from the spirit of the present invention. Furthermore, the configurations of the lids described above may be used independently, or the configurations of the lids in the respective examples may be applied in appropriate combination.

[0068] Based on the above description of this specification, the present invention may employ the following configurations [E1] to [E6]. [E1] The container has a container body having an opening formed at an upper end and a rim portion that forms the outer periphery of the opening, and the container body is formed so as to be bondable to the container body via an adhesive substance, and the container body has a paper-based substrate having a plurality of paper fibers as fibers, the main body has a joining area corresponding portion corresponding to a joining area defined as an area to be joined to the container along the edge of the container, and a lid area corresponding portion configured as a portion inward from the joining area corresponding portion, Assuming that the main body and the container main body are joined via the adhesive material, the surface of the main body that faces the container is defined as an opposing surface, and the surface opposite to the opposing surface is defined as an exposed surface, the paper-based substrate has a layered structure in which the paper fibers are layered so that, when the main body is bonded to the container main body via the adhesive substance, the adhesive substance can penetrate further toward the exposed surface side than the paper fibers arranged on the surface of the paper-based substrate, At least a part of the overlapping structure of the paper-based base material is exposed on at least a part of the surface of the bonding area corresponding portion on the opposing surface side. Lid body. [E2] The overlapping structure of the paper-based substrate has a first fiber part composed of the fibers located on the exposed surface side, a second fiber part composed of the fibers located more inward in the thickness direction of the paper-based substrate than the first fiber part, and a space part formed between the first fiber part and the second fiber part, When the main body is joined to the container main body via the adhesive substance, the adhesive substance enters at least a part of the space. The lid described in [E1] above. [E3] The overlapping structure of the paper-based substrate has a first fiber part made up of the fibers located on the exposed surface side, and a second fiber part made up of the fibers located closer to the opposing surface side along the thickness direction of the paper-based substrate than the first fiber part, the first fiber portion and the second fiber portion are connected to each other, A branched portion is formed by the first fiber portion and the second fiber portion. The lid according to [E1] or [E2] above. [E4] A lid body according to any one of [E1] to [E3] above; the container having the container body with the opening formed at an upper end, The lid body is joined to the container via the adhesive substance. Container with lid. [E5] the container body has a resin layer formed on at least the surface of the edge portion, the adhesive substance is a resin constituting the resin layer; The container with a lid described in [E4] above. [E6] A lid body according to any one of [E1] to [E3] above; the container having the container body with the opening formed at an upper end, the container body has a resin layer formed on at least the surface of the edge portion, The resin layer is a resin that can function as the adhesive substance. A combination of a lid and a container. [Explanation of symbols]

[0069] 1: Lid 2:Adhesive substance 3: Main body 4:Paper base material 5A: Joint area 5B: Lid area corresponding part 5C: Outer area corresponding part 6: Fiber 6A: Paper fiber 7: Concave and convex structure 8: Reception structure 9: Superimposed structure 10: Standing structure 11: First fiber part 11A: Fiber section 11B: Fiber part 11C: Fiber section 12: Second fiber part 12A: Fiber section 12B: Fiber part 12C: Fiber section 13: Third fiber section 14: Gap 14A: First gap 14B: Second gap 15: Space part 16: Branching 16A:Connection part 18: Notch 19: Outlet 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 B2: First fiber part B3: Second fiber section B4: Gap BC: predetermined part C1: Resin layer CT: center position FR: Predetermined part OVL: Overlay area R: Junction area Rz: Maximum height XS1:Area XS2: area XS3: area XS4: area

Claims

1. The container has a container body having an opening formed at an upper end and a rim portion that forms the outer periphery of the opening, and the container body is formed so as to be bondable to the container body via an adhesive substance, and the container body has a paper-based substrate having a plurality of paper fibers as fibers, the main body has a joining area corresponding portion corresponding to a joining area defined as an area to be joined to the container along the edge of the container, and a lid area corresponding portion configured as a portion inward from the joining area corresponding portion, Assuming that the main body and the container main body are joined via the adhesive material, the surface of the main body that faces the container is defined as an opposing surface, and the surface opposite to the opposing surface is defined as an exposed surface, the paper-based substrate has a layered structure in which the paper fibers are layered so that, when the main body is bonded to the container main body via the adhesive substance, the adhesive substance can penetrate further toward the exposed surface side than the paper fibers arranged on the surface of the paper-based substrate, At least a part of the overlapping structure of the paper-based base material is exposed on at least a part of the surface of the bonding area corresponding portion on the opposing surface side. Lid body.

2. The overlapping structure of the paper-based substrate has a first fiber part composed of the fibers located on the exposed surface side, a second fiber part composed of the fibers located more inward in the thickness direction of the paper-based substrate than the first fiber part, and a space part formed between the first fiber part and the second fiber part, When the main body is joined to the container main body via the adhesive substance, the adhesive substance enters at least a part of the space. The lid according to claim 1 .

3. The overlapping structure of the paper-based substrate has a first fiber part composed of the fibers located on the exposed surface side, and a second fiber part composed of the fibers located closer to the opposing surface side along the thickness direction of the paper-based substrate than the first fiber part, the first fiber portion and the second fiber portion are connected to each other, A branched portion is formed by the first fiber portion and the second fiber portion. The lid according to claim 1 .

4. The lid according to claim 1; the container having the container body with the opening formed at an upper end, The lid body is joined to the container via the adhesive substance. Container with lid.

5. the container body has a resin layer formed on at least the surface of the edge portion, the adhesive substance is a resin constituting the resin layer; The container with lid according to claim 4.

6. The lid according to claim 1; the container having the container body with the opening formed at an upper end, the container body has a resin layer formed on at least the surface of the edge portion, The resin layer is a resin that can function as the adhesive substance. A combination of a lid and a container.

Images