Exterior materials, containers, and combinations of containers and exterior materials

Abstract

To provide an exterior material excellent in heat insulation, a container, and a combination of the container and the exterior material.SOLUTION: Provided is an exterior material used by being attached to an outer circumferential surface of a container body of a container having the container body. The exterior material is formed with a plurality of groove streaks formed of a blank material of a paper material and extending from the outside of the blank material to the outer circumferential side of the container. The groove streaks include a plurality of protrusions projecting from the inside of the groove streaks toward the outer circumferential side of the container. A low density part is provided between a base end and a tip end of at least some of the protrusions. The low density part has a density of the fiber constituting the paper material being lower than the density in the protrusion in the base end.SELECTED DRAWING: Figure 27

Description

Technical Field

[0001] The present invention relates to exterior materials, containers, and combinations of containers and exterior materials.

Background Art

[0002] When a container contains high-temperature contents, it is required to slow down the speed of temperature rise on the outer peripheral surface of the container. Also, when the container contains low-temperature contents, it is required to suppress dew condensation on the outer peripheral surface of the container. For these reasons, there is a demand for the container to enhance the heat insulation property of the outer peripheral surface. Specific examples of the contents mentioned here include beverages such as coffee, foods such as noodles, and ice.

[0003] In response to the above requirements, Patent Documents 1 and 2 propose providing a sleeve as an exterior material so as to surround the outer peripheral surface of the container, providing convex portions protruding on the facing surface side with the outer peripheral surface in the sleeve, and forming a space for improving the heat insulation property between the sleeve and the outer peripheral surface of the container.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Sleeves proposed in Patent Documents 1 and 2, and containers having the same structure as such sleeves, have a short time to maintain sufficient heat insulation when containing high-temperature contents, and there is room for improvement in slowing down the rate at which the temperature of the outer surface of the container rises. For example, if the temperature of the outer surface of a container rises quickly when it contains high-temperature contents, it becomes difficult to carry the container while maintaining a grip on its outer surface. If one were to pick up and carry the container, one might, for example, place their fingers on the bottom and top of the container, holding it between their fingers from above and below. In this case, since the fingers rest on the top of the container, there is a possibility that the contents of the container may come into contact with the fingers, potentially causing burns.

[0006] Furthermore, the technologies presented in Patent Documents 1 and 2 have room for improvement in that the time it takes for condensation to form on the outer surface of the container when it contains a low-temperature substance is short. For example, if condensation forms on the outer surface of the container immediately when it contains a low-temperature substance, there is a risk that the container may slip from your hand when you grasp its outer surface.

[0007] The present invention has been made in view of the above points, and aims to provide an exterior material, a container, and a combination of a container and an exterior material that have excellent heat insulation properties. [Means for solving the problem]

[0008] The gist of this invention is the invention described in (1) to (19) below. (1) An exterior material formed from a blank material made of paper-based material and used by being attached to the outer wall surface of a container, The outer material has a plurality of grooves formed on its outside toward the outer surface of the container, and the grooves have a plurality of protrusions that project from the inside of the groove toward the outer surface of the container. At least a portion of the protrusion has a low-density area between its base and tip, where the density of the fibers constituting the paper-based material is lower than the density at the base of the protrusion. Exterior materials, (2) The low-density portion in the protrusion is the tip of the protrusion and The base end of the convex portion Between The paper-based material has a portion where the density of the fibers constituting it is reduced. Exterior materials as described in (1) above, (3) The low-density portion is formed to surround the tip of the protrusion, Claim 1 Exterior materials as described above. (4) The low-density portion is the base end and The aforementioned tip portion Between The paper-based material has a portion where the density of the fibers constituting it is reduced. the above (1) Exterior materials as described above, (5) In the low-density portion, the portion where the density of the fibers constituting the paper-based material decreases from the tip to the base is connected to the portion where the density of the fibers constituting the paper-based material decreases from the base to the tip. the above (1) Exterior materials as described above, (6) The protrusion has a slit formed between the tip and the base end. Claim 1 Exterior materials as described above. (7) The tip portion forms a concealing portion that conceals at least a part of the outer surface of the container. the above (1) Exterior materials as described above, (8) A compression portion is formed at the tip portion. the above (1) Exterior materials as described above. (9) A flat surface is formed at the tip portion, the above (1) Exterior materials as described above, (10) The first protrusion consisting of the aforementioned protrusion, It has a second protrusion connecting at least two different first protrusions, The second protrusion protrudes toward the side facing the outer peripheral surface, The height of the second protrusion is lower than that of the first protrusion. the above(1) the exterior material described in (11) The second convex part connects two adjacent first convex parts, and a combined structure part formed by a combination of the first convex part and the second convex part connected to the first convex part is continuously formed. the exterior material described in the above (10), (12) A protective material is laminated on the side of the non-facing surface with the outer peripheral surface. the above (1) exterior material described in (13) The convex part is a convex embossed part. the above (1) exterior material described in (14) The low-density part is formed in a crack shape at a position between the base end part and the tip end part of the convex part. the above (1) exterior material described in (15) The convex part forms a concave surface on the side of the non-facing surface with the outer peripheral surface. the above (1) exterior material described in (16) At least some of the convex parts have an adhesive. the above (1) exterior material described in (17) It is used as a sleeve attached to the outer peripheral surface. the exterior material described in any one of (1) to (16) above, (18) The exterior material described in any one of claims 1 to 16 is attached to the outer peripheral surface of the container body. Container, (19) A container having a container body and the exterior material described in any one of claims 1 to 16 has a combination of a container and an exterior material. Combination of container and exterior material.

Advantages of the Invention

[0009] According to the present invention, it is possible to provide an exterior material, a container, and a combination of a container and an exterior material that have excellent heat insulation properties. Specifically, even when a user picks up a container containing high-temperature contents and carries it, the need to carry the container by, for example, holding it between the top and bottom of the fingers can be reduced, thereby suppressing the possibility of the contents of the container coming into contact with the fingers, and also suppressing the risk of burns to the fingers from high-temperature contents.

[0010] Furthermore, according to the present invention, when a low-temperature substance is contained within the container, condensation is less likely to form on the outer surface of the container. Therefore, according to the present invention, for example, when a low-temperature substance is contained within the container, the risk of the container slipping from your hand due to condensation when you grasp the outer surface of the container can be suppressed. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a perspective view illustrating one embodiment of the first embodiment. [Figure 2] Figure 2 is a cross-sectional view illustrating one embodiment of the first embodiment. [Figure 3] Figure 3A is an enlarged cross-sectional view of region XS1 shown by the dashed line in Figure 2, and is an enlarged cross-sectional view illustrating one embodiment of the protrusion of the first embodiment. Figure 3B is an enlarged plan view illustrating one embodiment of the protrusion of the first embodiment. [Figure 4] Figures 4A, 4B, and 4C are schematic diagrams illustrating one embodiment of the fiber entanglement state at the tip of the protrusion in the first embodiment. Figure 4A is an enlarged cross-sectional view of region XS2 shown by the dashed line in Figure 3. [Figure 5] Figures 5A and 5B are plan views illustrating one embodiment of a blank material for exterior materials in the first embodiment. [Figure 6] Figures 6A to 6C are plan views illustrating examples of the layout of the protrusions. [Figure 7] Figures 7A and 7B are enlarged cross-sectional views illustrating one embodiment of the protrusion of the first embodiment. [Figure 8] Figure 8 is an enlarged cross-sectional view illustrating one embodiment of the protrusion of the first embodiment. [Figure 9] Figure 9 is a perspective view illustrating one embodiment of the second embodiment. [Figure 10] Figure 10 is a cross-sectional view illustrating one embodiment of the second embodiment. [Figure 11] Figure 11A is a plan view of a blank material for exterior materials in the second embodiment. Figure 11B is an enlarged plan view illustrating one embodiment of the first and second protrusions in the second embodiment. Figure 11B is also an enlarged cross-sectional view of region XS3 shown by the dashed line in Figure 11A. [Figure 12] Figure 12A is an enlarged cross-sectional view illustrating one embodiment of the first and second protrusions of the second embodiment. Also, Figure 12A is an enlarged cross-sectional view showing the state of the longitudinal section along line DD in Figure 11. Figure 12B is an enlarged cross-sectional view illustrating one embodiment of the second protrusion of the second embodiment. Also, Figure 12B is a cross-sectional view showing the state of the longitudinal section along line CC in Figure 11A. [Figure 13] Figure 13 is a perspective view illustrating one embodiment in which the exterior material is a sleeve. [Figure 14] Figure 14 is a perspective view illustrating one embodiment in which the exterior material is a sleeve. [Figure 15] Figure 15 is a cross-sectional view illustrating one embodiment of the third embodiment. [Figure 16] Figure 16 is a perspective view illustrating one embodiment in which the exterior material is a sleeve. [Figure 17] Figures 17A and 17B are plan views illustrating a modified example of the second embodiment. [Figure 18] Figures 18A and 18B are cross-sectional views illustrating one embodiment of the container body. [Figure 19] Figures 19A and 19B are cross-sectional views showing one embodiment in which the exterior material is used as an insulating sheet. [Figure 20]Figure 20 is a plan view illustrating one embodiment of a blank material for exterior materials in a modified example 2 of the second embodiment. [Figure 21] Figure 21 is a perspective view illustrating one embodiment of the exterior body in Modification 2 of the second embodiment. [Figure 22] Figure 22 is a cross-sectional view illustrating the operation and effects of the container according to the first embodiment. [Figure 23] Figures 23A and 23B are cross-sectional views of key parts illustrating a container of the fourth embodiment. [Figure 24] Figure 24 is an enlarged plan view illustrating one embodiment of the protrusion of the first embodiment. [Figure 25] Figure 25 is an enlarged plan view illustrating one embodiment of the protrusion of the first embodiment. [Figure 26] Figure 26 is an enlarged plan view illustrating one embodiment of the protrusion of the first embodiment. [Figure 27] Figure 27 is a partially enlarged view of the longitudinal section of the EE line in Figure 21. [Modes for carrying out the invention]

[0012] This document describes the exterior material and container according to the present invention. The container according to the present invention has the exterior material attached to the container body. Below, the container of the present invention with the exterior material attached will be described. The details of the exterior material of the present invention will be described in conjunction with the description of the container of the present invention.

[0013] In the following, a container fitted with the exterior material according to the present invention will be described in the order of the first embodiment, the second embodiment, and the third embodiment with reference to the drawings. Application examples using the exterior material will also be described.

[0014] In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, thus omitting redundant explanations.

[0015] The following description is a preferred example of the present invention, and the content of the present invention is not limited to these embodiments. Furthermore, in the following description, for the sake of convenience of explanation, directions such as front / back, left / right, up / down, and the direction of the horizontal plane are indicated, but the content of the present invention is not limited to these directions. In the example of Figure 1, the Z-axis direction is assumed to be the up / down direction (upper side is the +Z direction, lower side is the -Z direction), the directions along the mutually orthogonal X and Y axes defined on a plane normalized to the Z-axis direction are assumed to be the X-axis direction and the Y-axis direction, and the XY plane, which is the plane drawn between the X and Y axes, is assumed to be the horizontal plane, and the explanation will be based on these assumptions. The same applies to the X, Y and Z axes in the other drawings of Figure 1. The relative sizes and other ratios shown in Figures 1 to 27 are for convenience only and do not limit the actual sizes and ratios.

[0016] Furthermore, in Figures 1 and 2, the vertical direction along the surface of the exterior material 3, which will be described later, is defined as the P direction, the upward direction along the surface of the exterior material 3 is defined as the +P direction, and the downward direction along the surface of the exterior material 3 is defined as the -P direction. The thickness direction of the paper-based sheet 18 that forms the exterior material 3, which will be described later, is defined as the S direction, the direction from the center position in the thickness direction of the exterior material 3 toward the opposing surface 3A is defined as the +S direction, and the direction from the center position in the thickness direction of the exterior material 3 toward the non-opposing surface 3B is defined as the -S direction. The upward direction described when explaining the P direction, +P direction, and -P direction is the direction toward the opening 6 side of the container 1, which will be described later, and the downward direction is the direction toward the bottom surface 5 side of the container 1. The P direction, +P direction, -P direction, S direction, +S direction, and -S direction are the same for Figures 3 to 27.

[0017] [1 First Embodiment] [1-1 Structure] The container 1 according to the first embodiment comprises a container body (hereinafter sometimes simply referred to as the body) 2 and an outer covering material 3, as shown in Figures 1 and 2. Figure 1 is a perspective view illustrating one embodiment of the container 1 according to the first embodiment. Figure 2 is a cross-sectional view illustrating the state of the longitudinal section along line AA in Figure 1 for one embodiment of the container 1 according to the first embodiment. Note that, for the sake of explanation, the layout of the protrusions 9 in Figures 1 and 2 is not perfectly identical. The same applies to the relationship between Figure 9 and Figure 10. Figure 10 is a cross-sectional view illustrating the state of the longitudinal section along line BB in Figure 9 for one embodiment of the container 1 according to the second embodiment, but, for the sake of explanation, the layout of the protrusions 9 in Figures 9 and 10 is not perfectly identical.

[0018] (Main unit) The main body 2 is not particularly limited in its structure, but in the example shown in Figures 1 and 2, it comprises a body portion 4 formed by a body material 4A that forms the side walls, and a bottom portion 5 formed by a bottom material 5A that forms the bottom surface. The main body 2 has the body material 4A joined to the periphery of the bottom material 5A. The main body 2 has a closed bottom structure with an opening 6 formed by the body material 4A and the bottom material 5A forming an internal space, with the upper end being open. The opening 6 has an opening 6A at its upper end and an opening edge portion 6B that forms the contour of the opening 6. The main body 2 may have a cover (not shown) attached to the opening edge portion 6B as appropriate.

[0019] The base material 5A can be manufactured using a blank material (base material blank) formed by punching or other processes on a predetermined raw material. The body material 4A can be manufactured using a blank material (body material blank) formed by punching or other processes on a predetermined raw material, similar to the base material 5A. The body material 4A is formed in a ring shape. This can be formed by joining both ends of the body material blank material when it is wound in a ring shape.

[0020] Furthermore, the shape of the main body 2 is not particularly limited, but in the example shown in Figure 1, the shape of the body portion 4 of the main body 2 is formed as an inwardly tapered shape that tapers downward (-Z direction). The shape of the body portion 4 may be a tapered shape that tapers upward, or a non-tapered shape (a cylindrical shape with a constant outer diameter).

[0021] (Curled part) The main body 2 may have a curled portion 7 at its opening edge 6B, as shown in the example in Figure 1. The curled portion 7 is a part with a winding structure that can be formed by winding the upper end of the body material 4A outward. With the curled portion 7 formed, when the outer material 3 is attached to the outer surface of the body 4 (outer surface 2A of the main body 2) in a plan view of the container 1, the end face 3C of the outer material 3 can be concealed by the curled portion. In addition, the space (gap 27) between the outer material 3 and the outer surface 2A of the main body 2 can be concealed by the curled portion. Therefore, when liquid is placed inside the main body 2, the risk of the liquid entering the gap 27 between the outer material 3 and the outer surface 2A of the main body 2 can be suppressed.

[0022] However, Figure 1 is just one example, and the curled portion 7 may be omitted as shown in Figure 18A. Alternatively, a folded portion 8 may be formed instead of the curled portion 7 as shown in Figure 18B. The folded portion 8 can be formed by folding the upper end of the body material 4A outward. Note that the folded portion 8 in Figure 18B is just one example, and the folded portion 8 may also be formed by folding the upper end of the body material 4A inward.

[0023] The material of container 1 is not particularly limited, and examples include paper-based materials, resin materials, and metal materials.

[0024] (Exterior materials) The outer casing material 3 is attached to the outer circumferential surface 2A of the main body 2. In the examples in Figures 1 and 2, the outer circumferential surface 2A of the main body 2 is the outer surface of the side wall of the container 1 and is the outer circumferential surface of the body material 4A. In this example, the outer casing material 3 is attached to the outer circumferential surface 2A of the main body 2 so as to surround it.

[0025] The exterior material 3 is not limited in width in the vertical direction (P direction) along the surface of the paper-based sheet 18, which will be described later. Therefore, the range in which the exterior material 3 covers the outer peripheral surface 2A of the main body 2 is not particularly limited in the vertical direction. In the example shown in Figures 1 and 2, the exterior material 3 covers the outer peripheral surface 2A of the main body 2 from the lower end of the curled portion 7 to the position of the bottom surface portion 5 of the main body 2. However, this is just an example, and the exterior material 3 may cover the entire outer peripheral surface 2A of the main body 2, or it may cover only a part of the outer peripheral surface 2A of the main body 2.

[0026] (Shape of exterior material) The shape of the outer casing material 3 is not particularly limited, but it is preferable that it corresponds to the shape of the outer circumferential surface 2A of the main body 2. In the examples of Figures 1 and 2, the outer casing material 3 is formed in an annular cylindrical shape and is tapered towards the bottom. Such an outer casing material 3 can be formed by shaping a blank material 30 (blank material for outer casing material) to correspond to the shape of the outer circumferential surface 2A of the main body 2. Alternatively, the shape of the outer casing material 3 may be obtained by winding the blank material 30 around the shape of the outer circumferential surface 2A of the main body 2. The blank material 30 is formed using a paper-based material for forming the outer casing material 3. In the example of Figure 1, the blank material 30 is an embossed sheet formed in an arch shape as shown in Figure 5A, as will be described later. Figure 5A is a plan view showing an example of a blank material 30 for forming the outer casing material 3 attached to the example of the container 1 in Figures 1 and 2. In Figure 5A, arrow P indicates the radial direction of the sector forming the blank material 30, and when the blank material 30 is used as the outer casing material 3, it is the direction from the bottom to the top of the outer casing material 3. This is also true in Figures 11A, 17, and 20.

[0027] (Condition of exterior material attached to the main body) The exterior material 3 may be detachably attached or fixed, as long as it is attached to the outer circumferential surface 2A of the main body 2. In the example in Figure 1, the exterior material 3 is fixed to the outer circumferential surface 2A of the main body 2. In this case, the exterior material 3 is partially joined to the outer circumferential surface 2A of the main body 2. For example, in the example in Figure 1, the surface 3A of the exterior material facing the outer circumferential surface 2A and the outer circumferential surface 2A of the main body 2 are mutually fixed by linear joints 11 extending vertically at two different locations. Note that the joints 11 are not limited to this example and may be point-shaped. The joints 11 may also be formed as a planar shape having an area that does not completely negate the effects of the present invention.

[0028] An example of a case where the exterior material 3 is detachably attached to the main body 2 is when the exterior material 3 is used as a sleeve, as will be described later.

[0029] (Material of exterior materials) The outer packaging material 3 is preferably formed using a paper-based material. Examples of paper-based materials include so-called papers manufactured by bonding plant fibers and other fibers, as well as chemical fiber paper, synthetic paper, water-resistant paper, coated paper, alternative paper, parchment, wool paper, glass fiber paper, stone paper, ceramic paper, etc. The paper-based material may be recycled paper or non-recycled paper. However, as long as the material of the outer packaging material 3 contains a fibrous material, there is no prohibition against using a non-paper-based material. Examples of non-paper-based materials include cloth-type materials (woven fabrics and non-woven fabrics). Examples of non-woven fabrics include so-called airlaid sheets formed into a sheet by bonding crushed pulp that has been filled with fibers by an airflow, pulp-based materials, and nonwoven fabrics of natural fibers or synthetic fibers. It is also possible to use a combination of paper-based and non-paper-based materials as the material of the outer packaging material 3.

[0030] (Convex part) The exterior material 3 has a plurality of protrusions 9. The protrusions 9 project from the surface of the exterior material 3 toward the surface 3A facing the outer circumferential surface 2A. The protrusions 9 have a base end 9B and a tip end 9A. At least some of the tip ends 9A of the protrusions 9 are in contact with the outer circumferential surface 2A. However, the tip ends 9A of all the protrusions 9 may be in contact with the outer circumferential surface 2A.

[0031] (Pitch of the convex part) The pitch PI of the protrusions 9 is not particularly limited, but it is preferable that it is larger than the outer diameter (diameter) of the base end 9B of the protrusions 9. As shown in the example in Figure 5A, the pitch PI of the protrusions 9 represents the distance between the centers of adjacent protrusions 9. A large pitch PI of the protrusions 9 allows for a state where adjacent protrusions 9 are slightly spaced apart. Furthermore, when the protrusions 9 are slightly spaced apart, it becomes easier to form the low-density section 12, which will be described later, during the manufacturing process of the exterior material 3. Also, the pitch of adjacent protrusions 9 may be constant, as shown in Figures 6A and 6B, or it may not be uniform, as shown in Figures 5A, 5B, and 6C. Figures 6A and 6B show one embodiment of the layout of the protrusions 9. In Figure 6A, the protrusions 9 are arranged in a grid pattern with a uniform pitch, and in Figure 6B, the protrusions 9 are arranged in a staggered pattern with a uniform pitch. In Figure 6C, the pitch and arrangement of the protrusions 9 are formed in an irregular state. The pitch of the protrusions 9 represents the distance between the centers of adjacent protrusions 9.

[0032] (Layout of the protruding part) The layout of the protrusions 9 is not particularly limited, but as shown in the examples in Figures 1 and 2, it is preferable that at least some of the protrusions 9 are arranged in a dispersed manner. For example, in the examples in Figures 1 and 2, multiple protrusions 9 are arranged in a dispersed manner such that the base ends 9B of adjacent protrusions 9 are separated. Also, in the examples in Figures 1 and 2, the layout of the protrusions 9 is such that, with the exterior material 3 attached to the main body 2, the protrusions 9 are arranged in a row 13 of protrusions so that the pitch PI of adjacent protrusions 9 in the circumferential direction of the outer surface 2A of the main body 2 is constant, and multiple rows 13 of protrusions are arranged in the vertical direction. Furthermore, the pitch of the protrusions 9 forming the row 13 of protrusions arranged on the upper side (+P direction side) is greater than the pitch of the protrusions 9 forming the row 13 of protrusions arranged on the lower side (-P direction side). In such a layout of protrusions 9, the protrusions 9 are arranged to form multiple spiral rows 14 in a spiral shape. Furthermore, in the state of the blank material 30 with the exterior material 3 unfolded, the arrangement of these protrusions 9 is such that, as shown in Figure 5A, the protrusions 9 are aligned along the circumferential direction (arrow T direction) of the blank material 30, and the pitch PI of adjacent protrusions 9 in the T direction in the +P direction is greater than the pitch PI of adjacent protrusions 9 in the T direction in the -P direction. In Figure 5A, the protrusions 9 are not aligned in the direction of arrow P, but as shown in Figure 5B, the protrusions 9 may be aligned in the direction of arrow P.

[0033] (Shape of the protruding part) The shape of the convex surface 90 of the protrusion 9, as shown in Figures 1 and 2, is such that a raised portion (sometimes called a secondary raised portion 9D) is formed on the tip side of the main raised portion 9C, which is formed in a roughly dome shape, as shown in Figures 3A and 3B. However, Figures 3A and 3B are a cross-sectional view and a plan view showing one embodiment of the protrusion 9. Figure 3A is an enlarged cross-sectional view of the protrusion 9 in the region XS1 enclosed by the dashed line in Figure 2. Note that the protrusion 9 shown in Figures 3A and 3B is just an example and does not limit the shape of the protrusion 9. For example, the shape of the main raised portion 9C of the protrusion 9 may be a vertical shape such as a triangular pyramid or a square pyramid, a frustoconical shape, a columnar shape, etc. Also, the secondary raised portion 9D may be formed on the tip side of the protrusion 9 even if the shape of the main raised portion 9C is a vertical shape such as a triangular pyramid or a square pyramid, a frustoconical shape, a columnar shape, etc. The shape of the secondary ridge 9D is disc-shaped in the example shown in Figure 1, but this is just one example and is not limited to the shapes shown in Figures 3A and 3B.

[0034] (base end) The base end portion 9B of the protrusion 9 is composed of the portion where the protrusion 9 rises from the peripheral portion 15 formed on the outside of the protrusion 9. The peripheral portion 15 is formed between adjacent protrusions 9.

[0035] (Tip) The tip portion 9A of the protrusion 9 can be defined as a predetermined portion including the tip of the protrusion 9. In the examples of Figures 3A and 3B, the tip portion 9A of the protrusion 9 is the predetermined portion including the center of the secondary raised portion 9D of the protrusion 9 (the front surface portion 9D1 of the secondary raised portion 9D). If the secondary raised portion 9D is not formed on the protrusion 9, the tip portion 9A of the protrusion 9 is defined as the tip of the main raised portion 9C of the protrusion 9 and the portion near it.

[0036] (Compression section) The configuration of the tip portion 9A of the protrusion 9 is not particularly limited, but it is preferable that a compression portion 16 is formed at the tip portion 9A. The compression portion 16 is the portion of the paper-based sheet 18 for forming the blank material 30 that has a higher compression ratio than the base portion 9B. In the example of Figures 3A and 3B, the compression portion 16 is the portion of the entire protrusion 9 excluding the base portion 9B and the low-density portion 12. Therefore, in this example, a compression portion 16 is formed at least at the tip portion 9A. When a compression portion 16 is formed at least at the tip portion 9A of the protrusion 9, a state in which at least the tip portion 9A of the protrusion 9 has rigidity is formed, making it less likely for the shape of the protrusion 9 to collapse when the tip portion 9A is in contact with the outer peripheral surface 2A of the main body 2, and reducing the risk that the shape of the protrusion 9 will collapse and the contact area between the protrusion 9 and the outer peripheral surface 2A of the main body 2 will increase more than necessary.

[0037] (Thickness of the compressed section) The thickness of the compression portion 16 is preferably thinner than the thickness of the base portion 9B. This configuration can be achieved when the paper-based sheet 18 forming the exterior material 3, which will be described later, is embossed, and the portion corresponding to the compression portion 16 is pressed with a predetermined pressure higher than the portion corresponding to the base portion 9B.

[0038] (flat surface) As shown in the examples in Figures 3A and 3B, it is preferable that a flat surface 17A is formed on the tip 9A of the protrusion 9. When a flat surface 17A is formed on the tip 9A, it becomes easier to stably form a state in which the tip 9A is in contact with the outer surface 2A of the main body 2 when the exterior material 3 is attached to the outer surface 2A of the main body 2. However, this is not limited to the case where the tip 9A of the protrusion 9 in the exterior material 3 is a flat surface 17A. The tip 9A of the protrusion 9 in the exterior material 3 may have a concave surface 17B as shown in Figure 7A, or a convex surface 17C as shown in Figure 7B. Figures 7A and 7B are cross-sectional views showing one embodiment of the protrusion 9.

[0039] (Slit-shaped structure) A slit-shaped structure 35 may be formed at the tip portion 9A. The slit-shaped structure 35 is formed by cutting a portion of the fibers 18A constituting the paper-based sheet 18 when a tensile force is applied to the paper-based sheet 18 in the planar direction of the paper-based sheet 18. The slit-shaped structure 35 is a portion in which fibers 18 exist to the extent that the change in the contour shape of the slit-shaped structure 35 is restricted when a tensile force is applied to the paper-based sheet 18 in the planar direction of the paper-based sheet 18. The slit-shaped structure 35 may be connected to a low-density portion 12, which will be described later, as shown in Figure 26. In Figure 26, the slit-shaped structure 35 is formed in a straight line so as to cross the tip portion 9A, but the shape of the slit-shaped structure 35 is not limited to this.

[0040] (Low density part) At least some of the multiple protrusions 9 have low-density sections 12, as shown in Figures 3A, 3B, 4A, and 24. The low-density section 12 can be defined as a portion where the density of the fibers 18A forming the paper-based material (fiber density) is lower than the density of the fibers 18A at the base end 9B. The density of the fibers 18A forming the paper-based material refers to the density of the fibers 18A constituting the paper-based sheet 18 in the state in which the exterior material 3 is formed. Figure 4A is a cross-sectional view illustrating an example of the configuration of the low-density section 12. Figure 4A is an enlarged cross-sectional view of the region XS2 enclosed by the dashed line in Figure 3A. Figure 24 shows one embodiment of the protrusion 9. The low-density portion 12 is formed along the convex surface 90 of the convex portion 9, at a position between the base end 9B and the tip end 9A. In the examples of Figures 3A and 4A, the low-density portion 12 is formed along the convex surface 90 of the convex portion 9, at a position closer to the base end 9B than the outer peripheral edge of the tip end 9A, that is, it is formed on the side surface 9D2 of the secondary raised portion 9D.

[0041] The low-density portion 12 is preferably a portion with a density lower than the density of fibers 18A (fiber density) in the tip portion 9A. Furthermore, the low-density portion 12 is preferably a portion with a density lower than the density of fibers 18A in the peripheral portion 15. However, the low-density portion 12 is assumed to be a portion where multiple fibers 18A exist. In addition, the low-density portion 12 is preferably a portion where fibers 18 exist to the extent that the change in the contour shape of the low-density portion 12 is restricted when a tensile force is applied to the paper-based sheet 18 in the planar direction of the paper-based sheet 18, similar to the slit-shaped structure portion 35. Furthermore, the low-density portion 12 is preferably a portion where fibers 18A exist to the extent that the displacement of fibers 18A near the contour position of the low-density portion 12 outward from the convex surface 90 of the convex portion 9 is restricted.

[0042] Preferably, the low-density portion 12 is formed to surround the tip portion 9A of the protrusion 9. In the example of Figure 3B, the low-density portion 12 is formed to surround the entire perimeter of the tip portion 9A of the protrusion 9 in a plan view of the blank material 30 of the exterior material 3. For example, as shown in Figure 24, the low-density portion 12 may be formed around the tip portion 9A of the protrusion 9. However, this does not prohibit the low-density portion 12 from being formed on only a part of the perimeter of the tip portion 9A of the protrusion 9. Also, the low-density portion 12 may be formed at different positions along the convex surface 90 of the protrusion 9. For example, multiple low-density portions 12 may be formed at different distances from each other, such as at a position close to the tip portion 9A and at a position close to the base portion 9B of the protrusion 9, as illustrated in Figure 25. Furthermore, the low-density portion 12 is not limited to the example of Figure 4A, and may overlap at least a part of the concealed portion 21, for example, as shown in Figure 4C.

[0043] (Fiber density) The fiber density (density of fiber 18A) indicates the density. The fiber density can be determined, for example, by cutting out a predetermined portion of the protrusion 9, measuring the basis weight and thickness of the cut-out portion, and then dividing the basis weight by the thickness (basis weight / thickness).

[0044] The density of the fibers 18A in the excised portion can be determined according to the portion to be identified. For example, the density of the fibers 18A in the base portion 9B can be determined as the arithmetic mean of the fiber densities in predetermined portions excised from multiple arbitrarily selected locations in the base portion 9B. The density of the fibers 18A in the tip portion 9A can be determined as the fiber densities in the excised portion of the tip portion 9A. Similarly, the density of the fibers 18A in the peripheral portion 15 can be determined as the arithmetic mean of the fiber densities in predetermined portions excised from multiple arbitrarily selected locations in the peripheral portion 15. However, the fiber density determination methods described herein are merely examples, and do not prohibit the use of other methods. In addition to the above, the fiber density may be determined by methods such as measuring light transmittance. Furthermore, the fiber density may be determined using an image analysis device.

[0045] (Shape of low-density areas) The shape of the low-density portion 12 is not particularly limited, but in Figure 3B, it is formed in a crack-like manner between the base end 9B and the tip end 9A of the convex portion 9. The description of the low-density portion 12 as being formed in a crack-like manner indicates that a portion of the fiber sheet 18 extends linearly, where the fiber sheet 18 appears continuous to the naked eye, even though the fibers 18A are cut or frayed. In this case, "linear" includes straight lines, bent lines, curved lines, and combinations thereof.

[0046] (Part 1) The low-density portion 12 preferably has a first portion 19. The first portion 19 in the low-density portion 12 is defined as a portion where the density (fiber density) of the fibers 18A constituting the paper-based material that forms the convex portion 9 from the tip portion 9A toward the base portion 9B is reduced. In the example of Figure 4A, the first portion 19 is formed in the low-density portion 12 at a position on the end 12A side, which is closer to the tip portion 9A.

[0047] The decrease in fiber density can be identified, for example, by dividing the first portion 19 into multiple equally sized sections, determining the density in each section, and comparing the density in the section closest to the tip 9A with the density in the section closest to the base 9B.

[0048] (Part 2) The low-density portion 12 preferably has a second portion 20. The second portion 20 in the low-density portion 12 is defined as a portion where the fiber density of the fibers 18A constituting the paper-based material that forms the convex portion 9 from the base end 9B toward the tip end 9A is reduced. In the example in Figure 4, it is formed at the end 12B side of the low-density portion 12, which is closer to the base end 9B.

[0049] The decrease in fiber density in the second portion 20 can be identified, for example, in the same manner as in the first portion 19.

[0050] (The positional relationship between the first and second parts) It is preferable that the low-density portion 12 is formed such that the first portion 19 and the second portion 20 are connected. That is, it is preferable that in the low-density portion 12, the portion where the fiber density of the fibers 18A constituting the paper-based material decreases from the tip portion 9A to the base portion 9B is connected to the portion where the fiber density of the fibers 18A constituting the paper-based material decreases from the base portion 9B to the tip portion 9A.

[0051] Furthermore, in the low-density portion 12, a portion with a generally constant fiber density may be interposed between the first portion 19 and the second portion 20. The portion with a generally constant fiber density includes not only a portion with a uniform fiber density, but also a portion with less variation in fiber density than the first portion 19 and the second portion 20.

[0052] (Non-facing side) In the exterior material 3, on the non-facing surface 3B of the outer peripheral surface 2A, as shown in the examples in Figures 2, 3A, and 3B, a concave surface 91 is formed on the portion (back side) corresponding to the convex surface 90 of the convex portion 9. The concave surface 91 may be formed in a shape corresponding to the convex surface 90 of the convex portion 9. Therefore, in the exterior material 3, multiple concave surface 91 formation regions are formed on the non-facing surface 3B of the outer peripheral surface 2A. The layout and pitch of the multiple concave surface 91 formation regions correspond to the layout and pitch of the convex portion 9. However, this is just one example of a non-facing surface 3B, and a convex structure may also be formed on the non-facing surface 3B.

[0053] (Concealed part) A concealing portion 21 is formed on the protruding portion 9. The concealing portion 21 conceals at least a part of the outer surface 2A when the exterior material 3 is attached to the outer surface 2A of the main body 2. Here, the concealing portion 21 is formed to completely conceal the outer surface 2A from the outside, as well as to be formed so that a part or all of the outer surface 2A is visible from the outside through the concealing portion 21. The concealing portion 21 is formed to extend in a direction that crosses the thickness direction of the blank material 30 (in the direction intersecting the S direction in Figure 3A) when looking at the blank material 30 that forms the exterior material 3. When the concealing portion 21 extends in the plane direction of the blank material 30, it is possible to extend it parallel to the plane direction of the blank material 30, or in a direction that intersects diagonally with a plane parallel to the plane direction of the blank material 30, or a combination of these cases. Therefore, the concealing portion 21 may be formed in a shape that extends in the plane direction of the blank material 30 as a whole, while curving or bending with respect to a predetermined position.

[0054] In the protruding portion 9, the concealed portion 21 is formed at a position closer to the tip portion 9A than the low-density portion 12. The concealed portion 21 may be formed in the portion of the protruding portion 9 that includes at least a part of the tip portion 9A. Alternatively, the tip portion 9A may also serve as the concealed portion 21. The concealed portion 21 may be formed in the portion that includes the tip portion 9A. The concealed portion 21 may be formed as the portion that includes the tip portion 9A. In the examples of Figures 3A and 3B, the tip portion 9A also serves as the concealed portion 21. Note that when the tip portion 9A includes the concealed portion 21, it is also possible that the tip portion 9A has gaps or holes in addition to the concealed portion 21, due to the formation of gaps or holes in the tip portion 9A.

[0055] (Formation of protrusions) The protrusion 9 can be formed by embossing the sheet material (paper-based sheet 18) that forms the exterior material 3. In this case, the protrusion 9 is formed as a convex embossed portion, with a convex surface 90 formed on the facing surface 3A side, and a concave surface 91 formed on the non-facing surface 3B side corresponding to the portion where the convex surface 90 is formed. The concave surface 91 may be formed in a shape corresponding to the convex surface 90.

[0056] The sheet material forming the exterior material 3 is not particularly limited as long as it is a sheet made of paper-based material (paper-based sheet 18) and capable of forming the protrusions 9, and may be a sheet with a flat surface or a sheet with an uneven surface. An example of a sheet with an uneven surface is a sheet on which fine wavefronts (wavefronts with a height smaller than the protrusions 9 (in the second embodiment described later, the first protrusions 22 and the second protrusions 23)) are formed on the surface.

[0057] [1-2 Manufacturing method] Next, a method for manufacturing the container 1 according to the first embodiment will be described.

[0058] (Manufacturing process of the main unit) The manufacturing process for the container body (body 2) can be carried out by methods such as processing a blank material (body blank material) formed from a material corresponding to the material of the body 2, or molding a raw material composition containing a material corresponding to the material of the body 2. In the method of processing the body blank material, for example, if the body is made of a paper-based material, an arch-shaped (fan-shaped) body blank material used for forming the body material 4A and a circular bottom blank material used for forming the bottom material 5A are prepared. The body material 4A is formed by rolling up the arch-shaped body blank material and fixing the end of the roll. A predetermined portion from the outer edge of the circular bottom blank material to slightly inward is folded downward to form a hanging portion on the outer edge of the bottom blank material. This forms the bottom material 5A. The body material 4A is positioned to surround the bottom material 5A, and the lower end of the body material 4A is folded into the inner surface of the hanging portion of the bottom material 5A, thereby fixing the body material 4A and the bottom material 5A to each other. This forms the body portion 4 and the bottom portion 5, creating the main body 2. If necessary, the upper end of the main body 2 may be rolled outwards to form the curled portion 7.

[0059] (Manufacturing process for exterior materials) A sheet of paper-based material (referred to as paper-based sheet 18) is prepared to form the exterior material 3. The structure of the protrusions 9 can be formed on the paper-based sheet 18 by embossing it. At this time, the low-density portion 12 of the protrusions 9 can be formed by setting various conditions such as the embossing conditions and the shape of the mold. The low-density portion 12 can be formed by locally loosening the fibers 18A that make up the paper-based sheet 18 in predetermined parts within the protrusions 9, or by locally causing the fibers 18A to break in predetermined parts within the protrusions 9, during the embossing process. For example, in the embossing process, the portion of the paper-based sheet 18 corresponding to the tip 9A of the protrusions 9 is sandwiched in the embossing mold before it is perforated, and the paper-based sheet 18 is further pressed by the embossing mold, which makes it possible to cause loosening or breakage of at least a part of the fibers 18A at a predetermined position on the base end 9B side of the tip 9A in the portion corresponding to the protrusions 9, thereby creating the low-density portion 12. At this time, in the embossing mold, the portion corresponding to the vicinity of the tip 9A of the protrusion 9 makes surface contact with the paper-based sheet 18, thereby suppressing the perforation of the tip 9A when creating the low-density portion 12 and forming a concealed portion 21. Preferably, the concealed portion 21 is formed in a portion that includes at least a part of the tip 9A. The embossed paper-based sheet 18 (embossed sheet) is then cut into a shape corresponding to the shape of the outer material 3. This forms a blank material 30 (outer material blank) for forming the outer material 3. In the example of the container 1 shown in Figure 1, the blank material 30 is formed in an arched (fan-shaped) shape as shown in Figure 5A.

[0060] The blank material 30 may be used as the outer material 3 as is, or the blank material 30 may be shaped into a cylinder and used as the outer material 3. The container 1 and the outer material 3 may be provided to the user as a combination. In this case, when using the container 1, the user may wrap the outer material 3 around the outer surface 2A of the main body 2 as appropriate. Alternatively, as described below, the container (container with outer material) may be provided to the user with the outer material 3 attached to the outer surface 2A of the main body 2.

[0061] (Attaching the outer packaging material to the container) The blank material 30 is wrapped around the outer surface 2A of the main body 2. At this time, the convex surface 90 of the protrusion 9 of the blank material 30 is positioned facing the outer surface 2A of the main body 2. With the blank material 30 wrapped around the main body 2, the joint portion 11 is formed by fixing the main body to both ends 30A and 30B of the blank material 30, which are spaced apart in the winding direction. Furthermore, another joint portion 11 between the blank material 30 and the main body 2 is formed at a symmetrical position with respect to the joint portion 11, with the center of the main body 2 as the axis. All of the joint portions 11 are formed in the shape of lines extending in the vertical direction. In this way, the container 1 is manufactured.

[0062] [1-3 Actions and Effects] In the container 1 according to the first embodiment, a plurality of protrusions 9 are formed on the outer material 3, and the tips 9A of the protrusions 9 face the outer surface 2A of the main body 2. Low-density portions 12 are formed on the protrusions 9. As a result, when a high-temperature contents are placed in the container 1, even if heat is transferred from the body 4 of the main body 2 to the tips 9A of the protrusions 9, the low-density portion 12 is formed between the tips 9A and the base end 9B of the protrusions 9. Therefore, it is difficult for the heat from the tips 9A to reach the base end 9B of the protrusions 9 via the fiber sheet 18 through the fibers 18A. In addition, because the tips 9A are in contact with the main body 2, the contact area between the outer material 3 and the main body 2 is small. As a result, heat is not easily transferred from the main body 2 to the outer material 3. Furthermore, the protrusions 9 can function as spacers to form a gap 27 between the main body 2 and the outer material 3. As a result, an air layer is formed in the gap 27 between the main body 2 and the outer material 3, and the heat conduction suppression effect can also be obtained by the air layer.

[0063] Furthermore, in the exterior material 3 used in the first embodiment, since the low-density portion 12 is formed on the base end portion 9B side of the concealed portion 21, at least a part of the low-density portion 12 can be kept from contacting the outer peripheral surface 2A of the main body 2, and a part of the low-density portion 12 can be directed toward the gap 27. When the air layer in the gap 27 in the container 1 is heated, as shown in Figure 22, the portion of the low-density portion 12 can gradually diffuse the heat to the exterior material 3 in the direction from the low-density portion 12 toward the outside (arrow AR1 direction), and the air contained in the heated air layer can be gradually released to the outside. This is also thought to suppress the rise in temperature of the exterior material 3. Figure 22 is a cross-sectional view illustrating the state in which the protrusion 9 of the exterior body 3 and the main body 2 of the container 1 are in contact. Furthermore, by preventing at least a portion of the low-density portion 12 from coming into contact with the outer circumferential surface 2A of the main body 2, even when a pressing force is applied from the outside of the outer packaging material 3 toward the main body 2, it is possible to prevent the fibers 18 of the low-density portion 12 from coming into contact with the container 1 over a wide area, thereby reducing the contact area between the fibers 18 located on the inside when viewed in the thickness direction of the outer packaging 3 and the main body 2.

[0064] Furthermore, when a low-temperature contents (cold contents) are placed in the container 1, even if the tip 9A of the protrusion 9 is cooled by the body 4 of the main body 2, a low-density area 12 is formed between the tip 9A and the base end 9B of the protrusion 9. Therefore, the cooling of the tip 9A is less likely to spread to the base end 9B of the protrusion 9 via the fibers 18A. In addition, since the tip 9A of the protrusion 9 of the outer material 3 is in contact with the main body 2, the contact area between the outer material 3 and the main body 2 is small. As a result, the outer material 3 does not cool down easily. Furthermore, the outer material 3 also cools down less easily due to the insulating effect of the air layer formed in the gap 27 between the main body 2 and the outer material 3. Therefore, condensation is less likely to occur on the surface of the outer material 3 (the surface not facing the outer periphery of the main body).

[0065] [1-4 Variations] Next, we will explain the examples in detail.

[0066] (Variation 1) In the first embodiment, the protrusion 9 had a secondary raised portion 9D, but in the protrusion 9, the secondary raised portion 9D may be omitted as shown in Figure 8 (Modification 1). Figure 8 is a cross-sectional view showing an example of the protrusion 9 of the container 1 according to Modification 1. In Modification 1, the other configurations in which the secondary raised portion 9D is omitted in the protrusion 9 are the same as in the first embodiment described above, so a description will be omitted.

[0067] In the modified example 1, the main raised portion 9C forms a convex portion 9. The tip portion 9A is formed in a predetermined range including the tip of the main raised portion 9C. In the example in Figure 8, the portion including the tip portion 9A is a concealed portion 21, and a low-density portion 12 is formed around the concealed portion 21.

[0068] (Modification 2) In the container 1 according to the first embodiment, the outer material 3 may have a slit portion 34 formed on the base end portion 9B side of the protrusion 9 rather than the tip portion 9A (modification 2).

[0069] (Slit section) In the modified example 2 of the first embodiment, the slit portion 34 may be formed on the base end 9B side of the low-density portion 12 of the protrusion 9, may intersect with the low-density portion 12, or may be formed on the tip end 9A side of the low-density portion 12. The slit portion 34 may also be formed to merge with the low-density portion 12. The slit portion 34 may be located within the formation region of the low-density portion 12.

[0070] (Method for forming the slit portion) When the protrusion 9 is formed by embossing, the paper-based sheet 18 is pressed so as to cause breakage in multiple fibers 18A in the portion of the paper-based sheet 18 corresponding to the protrusion 9, and at least a portion of the broken fibers 18A are separated from each other. At this time, of the portion of the paper-based sheet 18 where breakage has occurred in the portion of the paper-based sheet 18 corresponding to the protrusion 9, a portion of the paper-based sheet 18 closer to the base end 9B than the tip end 9A is broken. The portion of the paper-based sheet 18 that does not break forms a low-density portion 12. As a result, a slit portion 34 is formed in the protrusion 9.

[0071] [2 Second Embodiment] A container according to a second embodiment will be described.

[0072] [2-1 Structure] The container 1 according to the second embodiment has a protrusion 9 in the first embodiment as the first protrusion 22, as shown in Figures 9 to 12. In the second embodiment, the exterior material has a second protrusion 23, which will be described later. The second embodiment is the same as the first embodiment in terms of configuration other than the first protrusion 22 and the second protrusion 23, so the description will be omitted. Figure 9 is a perspective view showing one embodiment of the container 1 according to the second embodiment. Figure 10 shows a cross-sectional view of the container 1 according to the second embodiment, showing one embodiment corresponding to the cross-section along line BB in Figure 9. Note that for the sake of explanation, the layout of the first protrusion 22 and the second protrusion 23 in Figures 9 and 10 are not perfectly identical. Figure 11A is a plan view showing an example of a blank material 31 forming the exterior material 3, and Figure 11B is a plan view for explaining an example of the first protrusion 22 and the second protrusion 23. Figure 12A is a cross-sectional view illustrating an example of the first protrusion 22 and the second protrusion 23. Figure 12B is a cross-sectional view illustrating an example of the second protrusion 23.

[0073] (First convex part) As shown in Figures 9 and 10, the first protrusion 22 is connected to the second protrusion 23, but otherwise it is configured in the same way as the protrusion 9 in the first embodiment as described above. In Figures 9 and 10, reference numeral 92A indicates the convex surface of the first protrusion 22, and reference numeral 92B indicates the concave surface of the first protrusion 22. Reference numeral 22A indicates the tip of the first protrusion 22, and reference numeral 22B indicates the base end of the first protrusion.

[0074] (Second convex part) The exterior material 3 has a plurality of second protrusions 23. Like the first protrusions, the second protrusions 23 project toward the surface 3A facing the outer peripheral surface 2A. As shown in Figures 9 and 11B, the second protrusions are formed to connect at least two different first protrusions 22. In the example in Figures 9 and 11B, they are formed to connect two adjacent different first protrusions 22. In Figures 9 and 10, reference numeral 93A indicates the convex surface of the second protrusion 23, and reference numeral 93B indicates the concave surface of the second protrusion 23. Reference numeral 23A indicates the tip of the second protrusion 23, and reference numeral 23B indicates the base end of the second protrusion.

[0075] Here, a first protrusion 22 adjacent to one first protrusion 22 refers to a first protrusion 22 that directly faces the first first protrusion 22 when the exterior material 3 is unfolded into a plane to form a blank material 31 as shown in Figure 11A. Figure 11A is a plan view showing an example of a blank material 31. The blank material 31 is an embossed sheet, similar to the blank material 30 shown in the description of the first embodiment. The blank material 31 may be the same as the blank material 30 except that it forms the first protrusion 22 and the second protrusion 23.

[0076] (Shape of the second protrusion) In the examples of Figures 9, 10, 11A, and 11B, the shape of the second protrusion 23 is formed in a mountain-like cross-section, as shown in Figure 12B. Figure 12B shows the state of the longitudinal section along the CC line in Figure 11A, and is a cross-sectional view showing one embodiment of the second protrusion 23. Note that the shape of the second protrusion 23 is not limited to the example in Figure 12B, and may be other shapes. For example, the shape of the second protrusion 23 may be U-shaped in cross-section, rectangular in cross-section, trapezoidal in cross-section, or irregular in shape. However, from the viewpoint of stabilizing the shape of the exterior material 3 and ease of embossing and design, it is preferable that the shape of the second protrusion 23 be a mountain-like cross-section.

[0077] (Height of the second protrusion) The height (H2) of the second protrusion 23 is formed to be lower than the height (H1) of the first protrusion 22, as shown in Figure 12A. This allows the tip 9A of the first protrusion 22 to be in contact with the main body 2 when the exterior material 3 is attached to the outer surface 2A of the main body 2, while the second protrusion 23 is spaced apart from the outer surface 2A of the main body 2. By forming the second protrusion 23 to be lower than the first protrusion 22 in this way, the risk of an excessive increase in the contact area between the exterior material 3 and the outer surface 2A of the main body 2 can be suppressed, and the heat insulation properties of the exterior material 3 can be maintained. In Figure 12A, the position of the outer surface 2A of the main body 2 is shown by a dashed line, assuming that the exterior material 3 is attached to the outer surface 2A of the main body 2.

[0078] (Combined structural part) As described above, the exterior material 3 has a first protrusion 22 and a second protrusion 23 formed on it, as shown in Figures 9 and 10, thus forming a combined structural part 24. The combined structural part 24 represents a structural unit formed by the combination of the first protrusion 22 and the second protrusion 23 connected to the first protrusion 22.

[0079] In the examples of Figures 9, 10, and 11A, multiple combination structural parts 24 are formed in a continuous (connected) manner. In particular, in the example of Figure 11, the structure in which multiple combination structural parts 24 are arranged in a continuous manner is formed to diagonally cross the direction of arrow P, which is the direction from the upper end to the lower end of the exterior material 3 when the blank material 31 is used as the exterior material 3. The example in Figure 11 is just one example, and the layout of the combination structural parts 24 is not limited to this example. For example, the structure in which multiple combination structural parts 24 are arranged in a continuous manner may be formed parallel to the direction of arrow P. Also, the combination structural parts 24 may be formed discontinuously.

[0080] (Formation of the first and second protrusions) The first protrusion 22 can be formed as an embossed portion (first convex embossed portion) by embossing, similar to the protrusion 9 in the first embodiment. The second protrusion 23 can be formed as an embossed portion (second convex embossed portion) formed by embossing. The second protrusion 23 may be formed integrally with the first protrusion 22 when the first protrusion 22 is formed by embossing. Alternatively, the first protrusion 22 and the second protrusion 23 may be embossed individually.

[0081] [2-2 Action and Effects] According to the container 1 of the second embodiment, the first protrusion 22 is formed, and the same effects as in the first embodiment can be obtained.

[0082] According to the container 1 of the second embodiment, the formation of the second protrusion 23 stabilizes the shape of the exterior material 3. According to the container 1 of the second embodiment, even if a force is applied to the exterior material 3 from the non-facing surface 3B side toward the facing surface 3A side, the formation of the second protrusion 23 makes it difficult for the exterior material 3 to deform in a way that causes the facing surface 3A side to protrude further, thereby suppressing the risk of the peripheral portion 15 of the exterior material 3 coming into contact with the outer peripheral surface 2A of the main body 2. However, the second protrusion 23 protrudes toward the facing surface 3A side. Therefore, at the position where the second protrusion 23 is formed, the distance between the exterior material 3 and the outer peripheral surface 2A is smaller than when the second protrusion 23 is not formed. However, in the second embodiment, the second protrusion 23 is formed to connect two different first protrusions 22. As a result, the exterior material 3 is less likely to deform, and the risk of the peripheral portion 15 coming into contact with the outer peripheral surface 2A is suppressed.

[0083] [2-3 Variations] (Variation 1) In the second embodiment, the layout of the second protrusions 23 is not limited to the layout described above, and the layout of the second protrusions 23 may be determined so that multiple second protrusions 23 display a single character or pattern, as shown in the example in Figure 17 (this form is referred to as Modification 1 of the second embodiment). Figure 17 is a diagram showing one example of the layout of the second protrusions 23 formed on the outer material 3 of the container 1 according to a modification of the second embodiment. In the example in Figure 17, the layout of the second protrusions 23 is determined so that it forms the uppercase letter A.

[0084] (Modification 2) Figure 20 shows an unfolded plan view illustrating one embodiment of a blank material 31 forming the outer casing material 3 of a container 1 according to the second embodiment. Figure 21 is a perspective view illustrating one embodiment in which the outer casing material 3, formed from the blank material 31 into a cylindrical shape, is attached to the outer circumferential surface of the container. As shown in Figure 27, the outer casing material 3 has a plurality of grooves 100 formed on the outside toward the outer circumferential surface 2A of the container 2, and the grooves 100 have a second protrusion 23 formed to protrude toward the outer circumferential surface, and the grooves 100 have a first protrusion 22 formed on the grooves 100 that protrudes from the inside of the grooves 100 toward the outer circumferential surface 2A from the second protrusion 23. In this way, the exterior material 3 has multiple second protrusions 23 formed, and further, the first protrusions 22 are formed to protrude from the second protrusions 23. This improves the strength of the exterior material 3, as well as the heat insulation performance, reducing the transfer of heat to the hands of the person holding it, and also makes the container less slippery when held.

[0085] (First convex part) The first protrusion 22 is formed in a shape that protrudes from above the second protrusion 23 in the same direction as the protrusion direction of the second protrusion (arrow +S direction in Figure 21). Therefore, the base end 22B of the first protrusion 22 is located above the second protrusion 23, and the tip 22A of the first protrusion 22 is formed in a position that protrudes further from above the second protrusion 23. The first protrusion 22 has a low-density portion 12 between the tip 9A and the base end 9B, where the fiber density is lower than that of the cut end 9B. The low-density portion 12 may be formed on all of the first protrusion 22, or on only some of the protrusions 22. Also, the first protrusion 22 may be formed on all of the second protrusions 23 formed by the groove 100, or on only some of the second protrusions 23. The other shapes and structures of the first protrusion 22 and the other shapes and structures of the low-density portion 12 in the first protrusion 22 may be the same as those of the first protrusion 22 in the first embodiment. The tip portion 9A of the first protrusion 23 may also be a concealed portion that hides a part of the outer surface 2A of the container.

[0086] (Second convex part) As shown in Figure 20, the second protrusion 23 is formed in a band-like shape extending diagonally in the direction of arrow P, and multiple second protrusions 23 are arranged at intervals. Each second protrusion 23 connects adjacent first protrusions 22, and also forms multiple first protrusions 22 along the longitudinal direction of the second protrusion 23 on its upper side (convex surface 93A side). At this time, multiple first protrusions 22 are arranged at predetermined intervals on the upper side of the second protrusion 23. The interval between adjacent first protrusions 22 may be constant or different.

[0087] (Shape of the second protrusion) The shape of the second protrusion 23 is formed in a trapezoidal cross-section in the example shown in Figures 20 and 21. However, the shape of the second protrusion 23 is not limited to the ridge-like protrusion 23 that protrudes from the outside of the outer packaging material 3 toward the outer peripheral surface 2A of the container by the groove 100 shown in Figures 20 and 21, but may be the same shape as the first protrusion 22, or any other shape. The second protrusion 23 may also have a low-density area similar to the first protrusion 22. When the second protrusion 23 is formed in the same shape as the first protrusion 22, it is preferable to form the second protrusion 23 to be larger than the first protrusion 22. The second protrusion 23 may also have a low-density area similar to the first protrusion 22.

[0088] (Height of the second protrusion) The height of the second protrusion 23 (the height difference from the peripheral portion 15 to the tip portion 23A) is not particularly limited. In modified example 2, regardless of the height of the second protrusion 23, it is formed to be lower than the height of the first protrusion 22 (the height difference from the peripheral portion 15 to the tip portion 22A).

[0089] (Variation 3) In the second modified example of the second embodiment, the shape of the second protrusion 23 is not limited to the examples shown in Figures 20 and 21. For example, the shape of the second protrusion 23 may be formed to resemble letters, pictures, etc., as shown in Figure 17B. Figure 17B is a plan view illustrating one embodiment of the blank material 31 in which the shape of the second protrusion 23 resembles the uppercase letter A.

[0090] [3 Third Embodiment] A third embodiment of the container 1 will be described.

[0091] [3-1 Structure] The container 1 according to the third embodiment has a configuration in which a protective material 25 is laminated on the side 3B of the outer periphery 2A that is not facing the outer periphery 2A of the outer casing material 3 in the first embodiment, as shown in Figure 15. The third embodiment is the same as the first embodiment in terms of all other components except for the protective material 25, so a description of the other components will be omitted. Figure 15 is a cross-sectional view illustrating one embodiment of the container according to the third embodiment. Figure 15 shows the case in which the outer casing material 3 of the container according to the first embodiment has a protective material 25 laminated on its outermost surface.

[0092] The container 1 according to the third embodiment is not limited to the example shown in Figure 15. The container 1 according to the third embodiment may have a configuration in which a protective material 25 is laminated on the non-facing side 3B of the outer material 3 in the second embodiment. In this case, the third embodiment may be the same as the second embodiment in terms of the other components except for the protective material 25, so the explanation of the other components will be omitted.

[0093] (Protective material) The protective material 25 may be a paper-based sheet similar to the paper-based sheet 18 used to form the blank material for exterior materials described in the first embodiment. Alternatively, the protective material 25 may be a non-paper-based sheet. Examples of non-paper-based sheets include resin films.

[0094] The outer packaging material 3 in the container 1 according to the third embodiment can be manufactured by laminating a protective material 25 to the side 3B of the embossed sheet (blank material 30 or blank material 31, for example) that is not facing the outer peripheral surface 2A. Appropriate lamination methods such as adhesive bonding or heat sealing can be used.

[0095] [3-2 Action and Effects] According to the third embodiment of the container 1, the same effects as in the first embodiment can be obtained because a protrusion 9 is formed on the outer material 3.

[0096] Furthermore, in the third embodiment, since the protective material 25 is provided on the outer material 3, the exposure of the concave surface 91 corresponding to the convex surface 90 of the embossed protrusion 9 can be suppressed, making it easier to print on the outer surface (exposed surface) of the outer material 3 and improving the design of the container 1.

[0097] Furthermore, because the protective material 25 is laminated onto the embossed sheet, the shape of the base end 9B of the protrusion 9 can be stabilized, deformation of the shape of the protrusion 9 can be suppressed, and the protrusion 9 can be made less susceptible to crushing.

[0098] Even when the container 1 has a first protrusion 22 and a second protrusion 23 formed on the outer material 3, the same effects as those described in the operation and effects of the third embodiment above can be obtained.

[0099] [4. Fourth Embodiment] A fourth embodiment of the container 1 will be described.

[0100] [4-1 Structure] The container 1 according to the fourth embodiment has a configuration in which, as shown in Figure 23A, at least one protrusion 95 is formed on the surface of the outer material 3 of the first embodiment, on the side that does not face the outer peripheral surface 2A (side 3B). The fourth embodiment is the same as the first embodiment in all other respects except for the protrusion 95 that protrudes on the side that does not face the outer peripheral surface 3B, so the description of the other respects will be omitted. Figure 23A is an enlarged schematic cross-sectional view of the main part to explain one embodiment of the container 1 according to the fourth embodiment. Figure 23A shows the case in which the outer material 3 of the container according to the first embodiment has multiple protrusions 95 that protrude on the side that does not face the outer peripheral surface 3B.

[0101] (Protrusion on the non-facing surface 3B side) The protrusion 95 projects toward the non-facing surface 3B side with respect to the outer peripheral surface 2A, forming a convex surface 96 on the non-facing surface 3B side. In the example shown in Figure 23A, multiple protrusions 95 are formed. The shape of the protrusion 95 is not particularly limited. As shown in the example in Figure 23A, the protrusion 95 may be formed in an approximately dome shape, or it may be conical or columnar. The shape of the convex surface 96 of the protrusion 95 and the shape of the convex surface 90 of the protrusion 9 may be the same or different. Also, the protrusion 95 may have a structure corresponding to the low-density portion 12, similar to the protrusion 9. In the thickness direction (S direction in Figure 23A), the outer casing 3 is recessed at the position on the facing surface 3A side corresponding to the protrusion 95, and a concave surface 97 may be formed in that recessed portion. In Figure 23A, as in the embodiments described in the first to third embodiments, the position on the non-facing surface 3A side corresponding to the convex portion 9 is recessed, and a concave surface 91 is formed in the recessed portion. The shapes of the concave surface 97 and the concave surface 91 may be approximately the same or different.

[0102] As shown in Figure 23A, it is preferable that the protrusion 95 is formed at a position that is not overlapping with the protrusion 9 (a position that does not overlap with the protrusion 9). This can be achieved by making the position where the protrusion 9 is formed and the position where the protrusion 95 is formed different when the blank material 30 forming the outer casing 3 is unfolded on a plane and the line of sight is along the thickness direction of the outer casing 3.

[0103] [4-2 Action and Effects] According to the fourth embodiment of the container 1, the same effects as in the first embodiment can be obtained because the protrusion 9 is formed on the outer material 3.

[0104] Furthermore, according to the fourth embodiment, the formation of multiple protrusions 95 extends the time it takes for heat transmitted from the protrusions 9 to reach the tips of the protrusions 95, which is expected to help suppress temperature changes in the outer casing 3, particularly around the protrusions 95. Therefore, by holding the container so that the user touches only the tips of the protrusions 95 rather than the base ends of the protrusions 95, it is expected that the user will be less affected by temperature changes in the outer casing 3 for a longer period of time.

[0105] [4-3 Variation] The container 1 according to the fourth embodiment is not limited to the example shown in Figure 23A. The container 1 according to the fourth embodiment may have a configuration in which a protective material 25 is laminated on the non-facing surface 3B side of the exterior material 3 in the fourth embodiment, as shown in Figure 23B. This form is called a modified example of the fourth embodiment. Figure 23B is an enlarged schematic cross-sectional view of the main part to explain one embodiment of the container 1 according to a modified example of the fourth embodiment. In the modified example of the fourth embodiment, the protective material 25 may be the same as the protective material 25 described in the third embodiment. The method of laminating the protective material 25 and the blank material 30 is not particularly limited. For example, the protective material 25 may be joined to the tip or near the tip of the protrusion 95 of the blank material 30 with an adhesive or the like to form a structure in which the protective material 25 and the blank material 30 are laminated together.

[0106] According to the container 1 of the fourth embodiment, the same effect as in the first embodiment can be obtained because a protrusion 9 is formed on the outer material 3.

[0107] Furthermore, in the modified version of the fourth embodiment, since the protective material 25 is provided on the exterior material 3, the exposure of the protrusions 95 can be suppressed, making it easier to print on the outer surface (exposed surface) of the exterior material 3, and thus enhancing the design of the container 1.

[0108] [5. Fifth Embodiment] A container 1 according to the fifth embodiment will be described.

[0109] [5-1 Structure] The container 1 according to the fifth embodiment has a configuration in which adhesive is provided on at least a portion of the protrusions 9 on the facing surface 3A side of the exterior material 3 in any of the first to fourth embodiments. The fifth embodiment has the same configuration as the first to fourth embodiments in other respects of the configuration in which at least a portion of the protrusions 9 on the facing surface 3A side of the exterior material 3 has adhesive, so the description of the other respects will be omitted. In the following description, the case in which the exterior material 3 of the container according to the first embodiment has adhesive on the protrusions 9 on the facing surface 3A side will be described. However, this does not prohibit the provision of adhesive on the protrusions 9 for the container 1 according to the second to fourth embodiments. As described above, adhesive may be provided on the protrusions 9 for the container according to the second to fourth embodiments. The provision of adhesive on the protrusions 9 refers to a state in which adhesive is attached to the fibers constituting the protrusions 9, and is a concept that includes cases in which the adhesive is attached only around the fibers, penetrates into the inside of the fibers, or the adhesive layer covers a certain area of ​​the protrusions 9.

[0110] The exterior material 3 has adhesive applied to at least a portion of the protrusions 9 on the facing surface 3A side. That is, the portion of the exterior material 3 to which adhesive is applied may be all of the protrusions 9 on the facing surface 3A of the exterior material, or it may be only a portion of the protrusions 9 on the facing surface 3A. The method of applying the adhesive is not particularly limited; for example, the adhesive can be applied to the exterior material 3 by spraying the adhesive onto the facing surface 3A side. The type of adhesive can be selected according to conditions such as the intended use of the container 1, and starch paste or the like may be used as appropriate.

[0111] When adhesive is provided on at least some of the protrusions 9 of the exterior material 3, it is particularly preferable that the adhesive is provided on the tip 9A of the protrusion 9 or in the vicinity of the tip 9A, and that the adhesive is provided on the tip 9A of the protrusion 9 and in the vicinity of the tip 9A. In this case, the flexibility of the exterior material 3 can be improved while the stability of the shape of the protrusions 9 of the exterior material 3 can be improved. The vicinity of the tip 9A may include a portion of the low-density portion 12 on the tip 9A side. In this case, it is expected that the stability of the shape of the protrusions 9 of the exterior material 3 can be further improved. Furthermore, when adhesive is provided on the tip 9A of the protrusions 9 of the exterior material 3, adhesive may be provided on the tip 9A of all the protrusions 9 on the facing surface 3A of the exterior material 3, or adhesive may be provided on the tip 9A of the protrusions 9 formed in a part of the facing surface 3A. In addition, adhesive may be provided on the tip 9A of selected protrusions 9. For example, adhesive may be provided on the tip 9A of every other protrusion 9. This does not prohibit the application of adhesive around the tip 9A or base 9B of at least a portion of the protrusion 9.

[0112] In cases where adhesive is provided on the protrusions 9 of the exterior material 3, adhesive may also be provided on the low-density portion 12. However, in this case, it is preferable that the adhesive is provided in an amount that does not impair the breathability of the low-density portion 12. Furthermore, even in this case, it is expected that the stability of the shape of the protrusions 9 of the exterior material 3 can be improved.

[0113] By applying adhesive to the protrusion 9 on the facing surface 3A side of the exterior material 3, the strength of the shape of the protrusion 9 of the exterior material 3 can be increased, and the shape of the protrusion 9 to which the adhesive is applied can be stabilized. Therefore, even if a strong external force is applied to the exterior material 3, the shape of the protrusion 9 is less likely to deform due to that external force. In addition, if adhesive is applied to the low-density portion 12 of the portion 9, the strength of the shape of the low-density portion 12 can be further enhanced.

[0114] Furthermore, the adhesive provided on the facing surface 3A side of the exterior material 3 may be used not only to stabilize the shape of the protrusion 9 of the exterior material 3, but also to join the exterior material 3 to the outer circumferential surface 2A of the main body 2. In other words, the adhesive does not have to be used to join the exterior material 3 to the outer circumferential surface 2A of the main body 2, or it may be used to join the exterior material 3 to the outer circumferential surface 2A of the main body 2. Also, even when the adhesive provided on the facing surface 3A side of the exterior material 3 is used to join the exterior material 3 to the outer circumferential surface 2A of the main body 2, the joint portion 11 shown in the description of the first embodiment may still be formed.

[0115] [4 Application Examples] (Application Example 1) In the first to fifth embodiments described above, the case in which the container 1 has an outer covering material 3 joined to the outer circumferential surface 2A of the main body 2 was described as an example. The outer covering material 3 shown in the first to fifth embodiments may be used as a sleeve that is detachably attached to the outer circumferential surface 2A of the main body 2. In this case, the outer covering material 3 may be separated from the container 1 and be a separate component from the container 1. Also, as shown in Figures 13, 14, and 16, the blank material 30 and blank material 31 that constitute the outer covering material 3 may be used as a sleeve separate from the container 1. Figure 13 shows one embodiment in which the blank material 30 is shaped to correspond to the shape of the outer covering material 3 in the first embodiment. Figure 14 shows one embodiment in which the blank material 31 is shaped to correspond to the shape of the outer covering material 3 in the second embodiment. Figure 16 shows one embodiment in which the laminate of the blank material 30 and the protective material 25 is shaped to correspond to the shape of the outer covering material 3 in the third embodiment. In addition to the above, the outer covering material 3 in which the blank material 31 shown in Figure 21 is shaped into a cylinder may also be used as a sleeve.

[0116] (Application Example 2) In Application Example 1, if the exterior material 3 is separated from the container 1 and becomes a separate component from the container 1, the main body 2 and the exterior material 3 may be used in combination with the container (the container referred to here corresponds to the main body 2).

[0117] (Application Example 3) The embossed sheet forming the blank material 30 that constitutes the exterior material 3 can be used as a layer constituting the heat insulating sheet 28, as shown in Figure 19A. The embossed sheet is formed by creating raised portions 9 on a paper-based sheet 18 by embossing, as shown in the description of the manufacturing method in the first embodiment.

[0118] In the example shown in Figure 19A, the heat insulating sheet 28 has an embossed sheet that forms the blank material 30 described above, and, as shown in the third embodiment, a protective material 25 is laminated on the side where the concave surface 91 is formed (the side corresponding to the non-facing surface 3B).

[0119] Furthermore, as shown in Figure 19B, the heat insulating sheet 28 may have a covering material 26 laminated on the side where the convex surface 90 is formed (the side corresponding to the facing surface 3A). The material of the covering material 26 may be the same as that of the protective material 25. The same applies to the embossed sheet that forms the blank material 31.

[0120] Since the heat insulating sheet 28 has protrusions 9, it has excellent heat insulating properties as described in the first and third embodiments.

[0121] Similarly, the embossed sheet forming the blank material 31 can also be used as a layer constituting the heat insulating sheet 28 (not shown). The embossed sheet forming the blank material 31 is a paper-based sheet 18 with the first protrusions 22 and the second protrusions 23 shown in the second embodiment formed on it.

[0122] In this case, since the heat insulating sheet 28 has the first protrusion 22, it has excellent heat insulating properties as described in the second embodiment.

[0123] Furthermore, the thermal insulation sheet according to this application example 3 can be specified as having the following configuration. That is, the thermal insulation sheet has an embossed sheet formed from a blank material having a paper-based material. The thermal insulation sheet has a plurality of protrusions that project from one side of the embossed sheet and have a base end and a tip end. The protrusions have a low-density portion where the density of fibers constituting the paper-based material is lower than the density at the tip end, and a concealing portion that extends in the planar direction of the blank material and conceals the outer peripheral surface at a position closer to the tip than the low-density portion.

[0124] Next, we will continue with a description of embodiments of the present invention. [Examples]

[0125] Example 1 A container of the present invention corresponding to Figure 1 of the first embodiment described above was prepared, and a thermal insulation test was conducted as follows. For the container of the present invention, a blank material made of a paper-based sheet with a thickness of 0.3 mm and embossed was used. This blank material was shaped into a cylinder with the convex portion facing the inner surface to form an outer casing, which was then attached to the main body. This completed the preparation of the container of the present invention. The container had a capacity of 240 cc.

[0126] (Thermal insulation test) 180cc of 70°C water was poured into the container. The time at which the water was poured was set to 0 seconds. The temperature of the outermost surface (outer surface) of the container with the outer casing attached (the non-facing surface of the outer casing) was measured for 180 seconds from the time of pouring until the temperature rose to over 10°C, over 20°C, and over 50°C. The results are shown in Table 1.

[0127] Comparative Examples 1 and 2 Commercially available containers (conventional products) were prepared as containers for Comparative Examples 1 and 2, and thermal insulation tests were conducted using these containers. Hereinafter, the containers for Comparative Examples 1 and 2 will be referred to as the first comparative container A and the second comparative container B, respectively. The thermal insulation tests were conducted in the same manner as in Example 1. The results are shown in Table 1.

[0128] [Table 1]

[0129] In the columns of Table 1, the symbols DA, DB, and DC indicate the following results. DA: The temperature of the outermost surface of the container did not rise above 20°C within the time limit set for measurement (180 seconds). DB: Within the measurement period, the temperature of the outermost surface of the container did not exceed 50°C. DC: The temperature of the outermost surface of the container did not rise above 20°C within the time set as the upper limit for measurement.

[0130] Although embodiments, modifications thereof, and examples of manufacturing methods thereof have been specifically described above, the present invention is not limited to the embodiments, modifications thereof, and examples of manufacturing methods described above, and various modifications based on the technical concept of the present invention are possible.

[0131] Furthermore, the configurations, methods, processes, shapes, materials, and numerical values ​​mentioned in the above-described embodiments, their modifications, and examples of manufacturing methods thereof can be combined with each other without departing from the spirit of the present invention.

[0132] Unless otherwise specified, the materials exemplified in the embodiments described above can be used individually or in combination of two or more.

[0133] The actions and effects described herein are not intended to limit the scope of the present invention.

[0134] This invention encompasses the following technical concepts. (1) An exterior material formed from a blank material made of paper-based material and used by being attached to the outer wall surface of a container, The outer material has a plurality of grooves formed on its outside toward the outer surface of the container, and the grooves have a plurality of protrusions that project from the inside of the groove toward the outer surface of the container. At least a portion of the protrusion has a low-density area between its base and tip, where the density of the fibers constituting the paper-based material is lower than the density at the base of the protrusion. Exterior materials. (2) The low-density portion of the protrusion has a portion in which the density of the fibers constituting the paper-based material decreases from the tip of the protrusion toward the base of the protrusion. The exterior material described in (1) above. (3) The low-density portion is formed to surround the tip of the protrusion, Exterior materials as described in (1) or (2) above. (4) The low-density portion has a portion in which the density of the fibers constituting the paper-based material decreases from the base end to the tip end. Exterior material as described in any one of the above (1) to (3). (5) In the low-density portion, the portion where the density of the fibers constituting the paper-based material decreases from the tip to the base is connected to the portion where the density of the fibers constituting the paper-based material decreases from the base to the tip. Exterior material as described in any one of the above (1) to (4). (6) The protrusion has a slit formed between the tip and the base end. Exterior material as described in any one of (1) through (5) above. (7) The tip portion forms a concealing portion that conceals at least a part of the outer surface of the container. Exterior material as described in any one of (1) through (6) above. (8) A compression portion is formed at the tip portion. Exterior material as described in any one of the above (1) to (7). (9) A flat surface is formed at the tip portion, Exterior material as described in any one of the above (1) to (8). (10) The first protrusion consisting of the aforementioned protrusion, It has a second protrusion connecting at least two different first protrusions, The second protrusion protrudes toward the side facing the outer peripheral surface, The height of the second protrusion is lower than that of the first protrusion. Exterior material as described in any one of the above (1) to (9). (11) The second protrusion connects two adjacent first protrusions, A combination structure formed by the first protrusion and the second protrusion connected to the first protrusion is continuously formed. Exterior materials as described in (10) above. (12) A protective material is laminated on the side that does not face the outer peripheral surface. Exterior material as described in any one of the above (1) through (11). (13) The convex portion is a convex embossed portion. Exterior material as described in any one of the above (1) through (12). (14) The low-density portion is formed in the shape of a slit between the base end and the tip of the protrusion, Exterior material as described in any one of the above (1) to (13). (15) The convex portion has a concave surface on the side that does not face the outer peripheral surface. Exterior material as described in any one of the above (1) through (14). (16) At least some of the protrusions have an adhesive, Exterior material as described in any one of the above (1) through (15). (17) Used as a sleeve attached to the outer surface, Exterior material as described in any one of the above (1) through (16). (18) The outer material described in any one of (1) to (17) above is attached to the outer surface of the container body. container. [Explanation of symbols]

[0135] 1: Container 2: Main unit 2A: Outer surface 3: Exterior materials 3A: Facing surfaces 3B: Non-facing surfaces 3C: End face 4: Torso 4A: Body material 5: Bottom part 5A:Bottom material 6: Opening 6A:Aperture 6B: Opening edge 7: Curl section 8: Folded section 9: Convex part 9A:Tip 9B: Proximal end 9C: Main ridge 9D: Sub-ridge 9D1: Front part 9D2: Side part 11:Joint part 12:Low density part 12A: End 12B: End 13: Rows of convex parts 14: Spiral row 15: Peripheral area 16: Compression section 17A:Flat surface 17B: Concave 17C: Convex 18: Paper-based sheets 18A: Fiber 19: Part 1 20: Part 2 21: Covert Department 22: First convex part 23: Second convex part 24: Combination structure 25: Protective material 26: Covering material 27: Gap 30: Blank material 30A: end 30B: Edge 31: Blank material 34: Slit section 35: Slit-shaped structure 90: Convex 91: Concave 100: Concave groove

Claims

1. An exterior material formed from a blank material made of paper-based material and used by being attached to the outer wall surface of a container, The outer material has a plurality of grooves formed on its outside toward the outer surface of the container, and the grooves have a plurality of protrusions that project from the inside of the groove toward the outer surface of the container. At least a portion of the protrusion has a low-density area between its base and tip, where the density of the fibers constituting the paper-based material is lower than the density at the base of the protrusion. Exterior materials.

2. The low-density portion of the protrusion has a portion between the tip of the protrusion and the base of the protrusion where the density of the fibers constituting the paper-based material is reduced. The exterior material according to claim 1.

3. The low-density portion is formed so as to surround the tip of the protrusion. The exterior material according to claim 1.

4. The low-density portion has a portion between the base end and the tip end where the density of the fibers constituting the paper-based material is reduced. The exterior material according to claim 1.

5. In the low-density portion, there is a portion where the density of the fibers constituting the paper-based material decreases from the tip to the base, and a portion where the density of the fibers constituting the paper-based material decreases from the base to the tip, The exterior material according to claim 1.

6. The aforementioned protrusion has a slit formed between its tip and base. The exterior material according to claim 1.

7. The tip portion forms a concealing portion that conceals at least a part of the outer surface of the container. The exterior material according to claim 1.

8. A compression portion is formed at the tip portion. The exterior material according to claim 1.

9. A flat surface is formed at the tip portion. The exterior material according to claim 1.

10. The first protrusion, which consists of the aforementioned protrusion, It has a second protrusion connecting at least two different first protrusions, The second protrusion protrudes toward the side facing the outer peripheral surface, The height of the second protrusion is lower than that of the first protrusion. The exterior material according to claim 1.

11. The second protrusion connects two adjacent first protrusions. A combination structure formed by the first protrusion and the second protrusion connected to the first protrusion is continuously formed. The exterior material according to claim 10.

12. A protective material is laminated on the side that does not face the outer peripheral surface. The exterior material according to claim 1.

13. The aforementioned protrusion is a convex embossed portion. The exterior material according to claim 1.

14. The low-density portion is formed in the shape of a slit between the base end and the tip of the protrusion. The exterior material according to claim 1.

15. The aforementioned protrusion has a concave surface on the side that does not face the outer circumferential surface. The exterior material according to claim 1.

16. At least some of the aforementioned protrusions have an adhesive. The exterior material according to claim 1.

17. Used as a sleeve attached to the outer surface, The exterior material according to any one of claims 1 to 16.

18. An exterior material according to any one of claims 1 to 16 is attached to the outer surface of the container body. container.

19. A container having a container body, Having an exterior material according to any one of claims 1 to 16, The combination of container and outer packaging material.

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