Box body and interior board for vehicle

Abstract

To ensure both recyclability and rigidity in thick molded products made from fiber-containing materials bonded together using thermoplastic resin in which natural fibers have been melted.SOLUTION: A box body comprises: a pair of flat plate members 70, 71, in which a plurality of attachment portions 74, 76 are formed penetrating in a plate thickness direction; and a plurality of wall surface members 62, 63 having a wall surface 80 forming a wall surface standing between a pair of flat plate members 60, 61 and a plurality of protrusions 82, 84 formed protruding in a standing direction from the wall surface 80. The box body is assembled in a state where the protrusions 82, 84 of the wall surface members 62, 63 are fitted into attachment portions 74, 76 of each of a pair of flat plate members 30, 31, so that the pair of flat plate members 30, 31 face each other, and the plurality of wall surface members 62, 63 are standing between the pair of flat plate members 70, 71.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a box and an interior board for a vehicle. [Background technology]

[0002] The following Patent Document 1 describes the use of an entangled nonwoven fabric containing fibrous materials such as natural fibers and a resin binder in vehicle interior boards (automotive load-bearing boards) such as floor boards and rear package trays. Specifically, the boards are formed by pressing a laminated structure in which a thermoplastic foam core layer is sandwiched between a first fibrous substrate and a second fibrous substrate made of an entangled nonwoven fabric, with the aim of reducing weight and improving durability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-222208 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a molded body having a certain thickness or more is manufactured using a natural fiber-containing material in which such natural fibers are bound by a molten thermoplastic resin, it is difficult to ensure rigidity, and the above-mentioned Patent Document 1 provides a thermoplastic foam core layer between the first fibrous substrate and the second fibrous substrate, which are fiber-containing materials. However, in recent years, there has been a demand for recycling such natural fiber-containing materials, and if the structure is as in the above-mentioned Patent Document 1, there is a problem that it is difficult to separate the thermoplastic foam core layer, which reduces recyclability.

[0005] The present invention has been made in consideration of such circumstances, and its objective is to ensure both recyclability and rigidity in a thick (tall) molded product produced using a fiber-containing material in which natural fibers are bound by molten thermoplastic resin. [Means for solving the problem]

[0006] In order to solve the above problems, the molded article disclosed in the present application has the following configuration. (1) A pair of flat plate members each made of a fiberboard formed by bonding natural fibers with a molten thermoplastic resin and forming the fiberboard into a plate shape, the pair having a plurality of mounting portions formed therethrough in the plate thickness direction; A plurality of wall members, which are plate-shaped members cut out from the fiber board, each wall member having a wall surface portion that forms a wall surface standing between a pair of the flat plate members and a plurality of protruding portions that protrude from the wall surface portion in a standing direction; Equipped with The protruding portion of the wall member is fitted into the mounting portion of each of the pair of flat plate members, so that the pair of flat plate members face each other and a plurality of the wall members are erected between the pair of flat plate members to form a box body.

[0007] The box body disclosed in the present application is a thick molded product obtained by simply combining a pair of flat plate members formed by drilling holes (piercing) in a fiberboard with a wall member cut out from the fiberboard. The box body disclosed in the present application can easily ensure rigidity by disposing a member similar to the wall member inside, even if the flat plate member is large or long or thick. This box body can be used in various applications, such as interior boards for vehicles, such as deck boards and tonneau boards, furniture such as chairs, and small items. The box body disclosed in the present application is highly recyclable, since it is molded only from fiberboard. The box body disclosed in the present application may be covered with a skin material or the like to be used as a product, but it is easy to configure the covering material to be peelable, and the box body can be used in various products with high recyclability.

[0008] The box disclosed in the present application is configured to fit the protruding portion of the wall member into the mounting portion of the flat plate member, but the fitting can be performed without using an adhesive (adhesive) between them. In detail, the flat plate member and the wall member are bonded by a thermoplastic resin made by melting natural fibers, and therefore, compared to those molded only from a thermoplastic resin, it is relatively easy to plastically deform them. In other words, the box disclosed in the present application is configured to fit the mounting portion and the protruding portion while plastically deforming each other, so that the box can be firmly combined without using an adhesive (adhesive). Furthermore, since there is no need to separate the parts impregnated with the adhesive or separate the adhesive during recycling, the box disclosed in the present application can be made more recyclable.

[0009] Moreover, the box having the above-mentioned configuration can have the following various aspects.

[0010] (2) The box body described in (1) above is a plate-shaped component cut out from the fiber board and assembled in an upright position inside the area surrounded by the plurality of wall components between the pair of flat plate components, the box body comprising a partition member having a main body portion and a protrusion portion formed to protrude from the main body portion in the upright direction and fit into the mounting portion.

[0011] The presence of the partition members makes the box body of this configuration more rigid. Note that the number and positions of the partition members in the box body of this configuration are not particularly limited, and they may be appropriately positioned depending on the shape and size of the flat plate members, the required load resistance, etc.

[0012] (3) A box according to (2), comprising a plurality of the partition members, the plurality of partition members being arranged in a lattice pattern.

[0013] The rigidity of the box body of this configuration can be effectively increased by the partition members arranged in a lattice pattern, and this configuration is particularly suitable for a box body having a board shape with a relatively large area.

[0014] (4) The box body according to any one of (1) to (3), wherein the outer surface of the protrusion and the inner surface of the mounting portion are fitted together in a state in which they are plastically deformed relative to each other.

[0015] In a box body of this configuration, the flat plate members and the wall members, and the flat plate members and the partition members are assembled without using adhesives or bonding materials, and as mentioned above, when recycling, there is no need to separate the areas impregnated with adhesive or to separate the adhesive, making a box body of this configuration more recyclable.

[0016] (5) The pair of flat plate members are rectangular, The wall members are provided in four locations corresponding to the four outer edges of the flat plate member, A box body as described in any one of items (1) to (4), wherein the flat plate member and the two wall members form corners of the box body, and the corners are configured such that the corners of the three faces formed by the flat plate member and the two wall members coincide with each other.

[0017] A box body of this configuration is structured so that no member protrudes at each corner; in other words, the four outer peripheral surfaces (edge ​​surfaces) of the flat plate member are flush with the surfaces of the four wall members, i.e., the box body has a rectangular prism shape.

[0018] (6) A vehicle interior board comprising the box body described in (5) above and a skin material covering the box body.

[0019] The vehicle interior board disclosed in the present application is configured using the rectangular parallelepiped box body described above. Conventional automobile interior boards include, for example, those having a structure in which a foam layer is laminated between fiberboards, but compared to the conventional boards, the manufacturing cost of the vehicle interior board disclosed in the present application can be reduced. In addition, the vehicle interior board disclosed in the present application has high recyclability because, when recycling, only the skin material needs to be peeled off and there is no need to separate the foam layer. Effect of the Invention

[0020] According to the present invention, it is possible to ensure both recyclability and rigidity in boxes and vehicle interior boards, which are thick molded products manufactured using a fiber-containing material in which natural fibers are bound by molten thermoplastic resin. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view showing a deck board according to an embodiment of the present invention; [Diagram 2] Plan view of the box that constitutes the deck board [Diagram 3] FIG. 1 is a perspective view of a box according to an embodiment of the present invention; [Figure 4] FIG. 4 is an exploded perspective view showing the parts of the box shown in FIG. [Diagram 5] FIG. 13 is a perspective view illustrating the assembly process of the box body. [Figure 6] FIG. 13 is a side cross-sectional view of a portion where the flat plate member and the wall member are fitted together. [Figure 7] FIG. 13 is a perspective view illustrating the assembly process of the box body. [Figure 8] FIG. 13 is a perspective view illustrating the assembly process of the box body. [Figure 9] FIG. 13 is a perspective view illustrating the assembly process of the box body. [Figure 10] A side cross-sectional view of a portion corresponding to a corner of the box in FIG. [Figure 11] FIG. 10 is a plan view of the box during assembly shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] A deck board 10 according to an embodiment of the present invention is shown in Figures 1 and 2. Deck board 10 is an automobile interior board that forms the floor surface of a luggage compartment RR behind rear seats 12 of the automobile. Deck board 10 is rectangular, and comprises a board body 20 shown in Figure 2, a skin material 22 that covers board body 20, and a gripping member 24 that is used when an occupant lifts up deck board 10 from the rear side.

[0023] The board body 20 is a box-shaped molded product assembled with multiple members, and is an embodiment of a box according to the present invention. The board body 20 is composed of a pair of flat plate members, an upper plate member 30 and a lower plate member 31, a first sidewall member 32 and a second sidewall member 33 as wall members connecting the peripheries of the upper plate member 30 and the lower plate member 31, and partition members 34, 35 that divide the rectangular parallelepiped internal space formed by the upper plate member 30, the lower plate member 31, the first sidewall member 32 and the second sidewall member 33 into multiple spaces. All of these members 30, 31, 32, 33, 34, 35 are molded from fiberboards formed by binding natural fibers with molten thermoplastic resin and molding them into a plate shape.

[0024] The fiber board is made from natural plant fibers and thermoplastic resin fibers, and the mixed fibers are opened and laminated to form a fiber web, which is then heated and pressed into a plate shape. Examples of the plant fibers include bast plant fibers such as kenaf, and wood fibers obtained by defibrating fibrous wood. Although plant fibers are exemplified as natural fibers, they may also be animal fibers or mineral fibers. In the fiber board of this embodiment, the plant fibers that are natural fibers are kenaf fibers. The thermoplastic resin may be any resin that functions as a binder to bind fibers together, and examples of the thermoplastic resin include polyolefin resins (polypropylene, polyethylene, etc.), polyester resins (aliphatic polyester resins such as polylactic acid and polycaprolactone, and aromatic polyester resins such as polyethylene terephthalate), and the like. In this embodiment, the fiber board is made of polypropylene (PP). The fibers and thermoplastic resins do not need to be of only one type, and may be a mixture of multiple types.

[0025] As will be explained in detail later, the upper plate member 30 and the lower plate member 31 are formed by drilling holes (piercing) in the above-mentioned fiberboard. Meanwhile, the first sidewall member 32, the second sidewall member 33 and the partition members 34, 35 are cut out from the fiberboard. The board body 20 is formed by fitting together these members 30, 31, 32, 33, 34, 35. Incidentally, these members 30, 31, 32, 33, 34, 35 are simply fitted together without the use of any adhesive (bonding material).

[0026] The partition members 34, 35 are a first partition member 34 extending in the front-rear direction (the short side direction of the upper plate member 30 and the lower plate member 31) and a second partition member 35 extending in the left-right direction (the long side direction of the upper plate member 30 and the lower plate member 31), which are arranged in a lattice pattern intersecting with each other to form a plurality of small rectangular spaces. With such a configuration, although the board body 20 has a relatively large area (large in plan view), it has sufficient rigidity against load in the board thickness direction.

[0027] A method for manufacturing a box 50 that has the same configuration as the board body 20 but is smaller in size will be described in detail below with reference to Figures 3 to 11. This box 50 has the same thickness as the board body 20, but is smaller in front-to-back and left-to-right dimensions in a plan view. Note that some of Figures 3 to 11 use X, Y, and Z to indicate directions.

[0028] 3 and 4, like the board body 20, the box body 50 is composed of an upper plate member 60, a lower plate member 61, two first side wall members 62, two second side wall members 63, a first partition member 64, and a second partition member 65. As will be described in detail later, the upper plate member 30 and the lower plate member 31 are, before assembly, as shown in Fig. 4, board members 70, 71 that are slightly larger than when completed, and in the manufacturing process, the outer periphery is cut off to obtain the final shape shown in Fig. 3.

[0029] The upper board member 70 and the lower board member 71 are formed by piercing a rectangular fiber board 72 with a plurality of through holes 74, 76 as attachment portions. The first through hole 74 and the second through hole 76 are both rectangular long holes, but the second through hole 76 is shorter in length than the first through hole 74. The first through hole 74 is arranged in a direction extending in two directions (X direction and Y direction) in which the outer edge of the fiber board 72 extends. A part 74a of the first through hole 74 is arranged along the outer edge of the fiber board 72, and the remaining one 74b of the first through hole 74 is arranged in the middle position between the ones arranged along the two opposing sides. The second through hole 76 is arranged at a position where the extending directions of the ones 74a arranged along the outer edge of the fiber board 72 intersect. In addition, the second through hole 76 formed in the upper board member 70 is elongated in the Y direction, and the second through hole 76 formed in the lower board member 71 is elongated in the X direction.

[0030] The first sidewall member 62 and the second sidewall member 63 are plate-shaped members cut out from a fiberboard, and have a longitudinal main body (wall surface) 80 and protruding portions 82, 84 formed protruding from the main body 80 in the plate surface direction. The first protruding portion 82 is a portion that fits into the first through hole 74, and the second protruding portion 84 is a portion that fits into the second through hole 76. The first protruding portions 82 are formed on both sides in the short side direction in two on each of the first sidewall member 62 and the second sidewall member 63. On the other hand, the second protruding portions 84 are formed on both ends in the long side direction only on one side in the short side direction. The first sidewall member 62 is for forming a sidewall surface extending in the X direction with respect to the upper board member 70 and the lower board member 71, and the second protruding portion 84 is formed only on the lower side. The second sidewall member 63 is for forming sidewall surfaces extending in the Y direction relative to the upper board member 70 and the lower board member 71, and the second protrusion 84 is formed only on the upper side.

[0031] In order to allow the first and second sidewall members 62 and 63 to overlap each other at both longitudinal ends, a notch 86 is formed in the upper side of the main body 80 of the first sidewall member 62, and a notch 87 is formed in the lower side of the main body 80 of the second sidewall member 63. Furthermore, a notch 88 is formed between the upper first protruding portions 82 of the first and second sidewall members 62 and 63. This notch 88 is for overlapping the partition members 64 and 65 described later.

[0032] The first partition member 64 and the second partition member 65 are plate-shaped members cut out from a fiberboard, and have a longitudinal main body 90 and protruding portions 92 formed to protrude from the main body 90 in the plate surface direction. The first side wall member 62 and the second side wall member 63 each have two protruding portions 92 formed on both sides in the short direction. These protruding portions 92 are portions to be fitted into the first through holes 74. The first partition member 64 has a notch formed between the lower protruding portions 92, and the second partition member 65 has a notch formed between the upper protruding portions 92, so that they can be stacked perpendicular to each other. The main body 90 of the first partition member 64 and the main body 90 of the second partition member 65 have notches 94 formed on the lower sides of both ends in the longitudinal direction. This cutout 94 is for overlapping the main body parts 90 of the first partition member 64 and the second partition member 65 with the cutouts 88 of the first partition member 64 and the second partition member 65 described above.

[0033] Next, a method of fitting each member together will be described in order. First, as shown in FIG. 5, two first sidewall members 62 are assembled to the lower board member 71. Specifically, the first protruding portion 82 and the second protruding portion 84 of the first sidewall member 62 are fitted into the first through hole 74 and the second through hole 76 formed along two sides of the lower board member 71 extending in the X direction, respectively. As shown in FIG. 6, the first protruding portion 82 has a tapered shape in which the width L1 in the longitudinal direction at the tip is smaller than the width L2 at the base end, and the width becomes smaller toward the upper end. On the other hand, the first through hole 74 is formed to penetrate with the same width L3. The width L3 of the first through hole 74 is larger than the width L1 at the tip of the first protruding portion 82 and smaller than the width L2 at the base end.

[0034] Due to such a shape, when the first protrusion 82 is inserted into the first through hole 74, the outer surface of the first protrusion 82 comes into contact with the inner surface of the first through hole 74 during the insertion. Since both the lower board member 71 and the first side wall member 62 are made of fiberboard, they can be plastically deformed by applying a certain amount of force. In other words, when the first protrusion 82 is inserted into the first through hole 74, it is possible to insert the first protrusion 82 to a position where the lower surface of the main body 80 abuts against the upper surface of the lower board member 71 while plastically deforming each other by applying a certain amount of force. In this state, the outer surface of the first protrusion 82 and the inner surface of the first through hole 74 are fitted together in a plastically deformed state, and the lower board member 71 and the first side wall member 62 do not easily come off.

[0035] After the two first sidewall members 62 are attached to the lower board member 71, the two second sidewall members 63 are attached as shown in FIG. 7. Specifically, the first protrusion 82 of the second sidewall member 63 is fitted into the first through hole 74 formed along the two sides of the lower board member 71 extending in the Y direction. The outer surface of the first protrusion 82 and the inner surface of the first through hole 74 are fitted together in a state of being plastically deformed, so that the lower board member 71 and the second sidewall member 63 do not easily come off. In addition, both ends of the second sidewall member 63 in the longitudinal direction are overlapped with the ends of the first sidewall member 62 by utilizing the notch 87 and the notch 86 of the first sidewall member 62.

[0036] 8, the second partition member 65 is attached between the two second sidewall members 63 in parallel thereto, and then the first partition member 64 is attached between the two first sidewall members 62 in parallel thereto and perpendicular to the second partition member 65. Specifically, the protruding portions 92 of the partition members 64, 65 are fitted into the first through holes 74 formed on the insides of the sidewall members 62, 63 in the lower board member 71. The outer surfaces of the protruding portions 92 and the inner surfaces of the first through holes 74 are also fitted into each other in a state of plastic deformation, and the lower board member 71 and the partition members 64, 65 are not easily separated. In addition, both longitudinal ends of the second partition member 65 overlap with the first side wall members 62 on both sides by utilizing the cutout 94 and the cutout 88 of the first side wall member 62, and both longitudinal ends of the first partition member 64 overlap with the second side wall members 63 on both sides by utilizing the cutout 94 and the cutout 88 of the second side wall member 63.

[0037] As shown in Fig. 8, when the two first sidewall members 62, the two second sidewall members 63, the first partition member 64, and the second partition member 65 are assembled to the lower board member 71, the upper surface of the main body 80 of the first sidewall member 62, the upper surface of the main body 80 of the second sidewall member 63, and the upper surfaces of the main bodies 90 of the partition members 64, 65 are arranged in a plane parallel to the lower board member 71, and the first protrusion 82, the second protrusion 84, and the protrusion 92 protrude upward from the plane. Then, as shown in Fig. 9, the upper board member 70 is assembled while fitting the first protrusion 82, the second protrusion 84, and the protrusion 92 into the first through hole 74 and the second through hole 76. Furthermore, the first protrusion 82 and protrusion 92 fit into the first through hole 74 of the upper board member 70 with the outer surfaces of the first protrusion 82 and protrusion 92 and the inner surface of the first through hole 74 being plastically deformed relative to each other, and therefore the first protrusion 82 and protrusion 92 will not easily come off the upper board member 70.

[0038] Incidentally, as shown in Fig. 10, a notch 86 in the first sidewall member 62 and a notch 87 in the second sidewall member 63 are formed so that a slight gap S is generated in the vertical direction at the portion where the longitudinal end of the first sidewall member 62 and the longitudinal end of the second sidewall member 63 are overlapped. For example, if there is no gap S and the height dimension of the portion where the longitudinal end of the first sidewall member 62 and the longitudinal end of the second sidewall member 63 are overlapped is equal to the vertical distance between the upper plate member 30 and the lower plate member 31, a state in which the distance between the upper plate member 30 and the lower plate member 31 widens at the corners of the box body 50, that is, a so-called floating, is likely to occur. In contrast, according to the box body 50 of this embodiment, it is possible to prevent such floating from occurring.

[0039] Finally, as shown in Figures 10 and 11, the outer peripheries 70a, 71a of the upper board member 70 and the lower board member 71 are cut. More specifically, the upper board member 70 and the lower board member 71 are cut along the outer surface of the first sidewall member 62 and the outer surface of the second sidewall member 63. As a result, as shown in Figure 3, the four upper corners of the box body 50 are configured so that the corners of the three surfaces formed by the upper board member 30, the first sidewall member 62, and the second sidewall member 63 coincide with each other, and the four lower corners of the box body 50 are configured so that the corners of the three surfaces formed by the lower board member 31, the first sidewall member 62, and the second sidewall member 63 coincide with each other.

[0040] The upper plate member 30 and the lower plate member 31, in which the outer periphery 70a, 71a has been cut off, have a notch shape that opens to the side at the locations where the first through hole 74 and the second through hole 76 were. The upper plate member 30 and the lower plate member 31 can be prepared in this shape before assembly, but when assembling the first side wall member 62 and the second side wall member 63, not only a force in the vertical direction but also a force in the horizontal direction is required, making it difficult to align the positions of the first side wall member 62 and the second side wall member 63 with respect to the upper plate member 30 and the lower plate member 31. The box body 50 of this embodiment is configured to insert the protrusions 82, 84 into the through holes 74, 76, so that the positions of the first side wall member 62 and the second side wall member 63 with respect to the upper plate member 30 and the lower plate member 31 can be appropriately determined.

[0041] The box body 50 of this embodiment and the main board body 20 constituting the deck board 10 are formed into thick molded articles simply by assembling a pair of flat plate members (upper plate member, lower plate member) pierced into a fiber board and a plurality of wall members (side wall members) cut out from the fiber board. Furthermore, the box body 50 of this embodiment, and in particular the main board body 20 constituting the deck board 10, are large molded articles in plan view, but the interior has a plurality of partition members arranged in a lattice pattern, providing sufficient rigidity against load in the board thickness direction.

[0042] Furthermore, since the board body 20 that constitutes the deck board 10 is only a member molded from fiberboard by simply peeling off the skin material 22, there is no need for processes such as separating the foam layer as in conventional deck boards, making it highly recyclable. Furthermore, the board body 20 (box body 50) is configured so that the outer surfaces of the protruding parts 82, 84 and the inner surfaces of the through-holes 74, 76 fit together in a state in which they are plastically deformed, and so the board is assembled without the use of adhesives or bonding materials, and there is no need to separate parts impregnated with adhesive or separate the bonding material when recycling, making it more recyclable.

[0043] <Other embodiments> The present invention is not limited to the above-described embodiment, and can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art. For example, the following embodiments are also included within the technical scope of the present invention.

[0044] In the above embodiment, the board body (box body) 20 and the box body 50 have relatively small vertical dimensions and are board-shaped moldings, but the height dimension of the wall member may be equal to the length dimension of the flat member, for example, such as a cubic shape, or the height dimension of the wall member may be greater than the length dimension of the flat member.

[0045] In the above embodiment, the board body (box body) 20 and the box body 50 are rectangular parallelepiped shaped, but are not limited thereto. For example, they may be triangular prism shaped or polygonal prism shaped. Also, in the above embodiment, the box bodies 20 and 50 are formed so that the two side wall members overlap each other, but they may be configured so that they are assembled with a gap between the two side wall members.

[0046] In the above embodiment, the deck board 10 of an automobile is exemplified as an interior board for a vehicle, but it can also be used for a tonneau board, a rear package tray, etc. Furthermore, it can be used for various things such as furniture such as chairs and small items other than interior boards for a vehicle. [Explanation of symbols]

[0047] 10... deck board (vehicle interior board), 20... board body (box body), 22... skin material, 30... upper plate member (flat plate member), 31... lower plate member (flat plate member), 32... first side wall member (wall member), 33... second side wall member (wall member), 34... first partition member, 35... second partition member, 50... box body, 60... upper plate member (flat plate member), 61... lower plate member (flat plate member), 62... first side wall member (wall member), 63... second side wall member (wall member), 64... first partition member, 65... second partition member, 72... fiber board, 74... first through hole (mounting portion), 76... second through hole (mounting portion), 80... main body portion (wall portion), 82... first protruding portion, 84... second protruding portion, 90... main body portion, 92... protruding portion

Claims

1. A pair of flat plate members each made of a fiber board formed by bonding natural fibers with a molten thermoplastic resin and forming the board into a plate shape, the pair of flat plate members each having a plurality of mounting portions formed therethrough in a plate thickness direction; a plurality of wall members each having a wall surface portion forming a wall surface standing between a pair of the flat plate members and a plurality of protruding portions formed in a standing direction from the wall surface portion; Equipped with The protruding portion of the wall member is fitted into the mounting portion of each of the pair of flat plate members, so that the pair of flat plate members face each other and a plurality of the wall members are erected between the pair of flat plate members to form a box body.

2. 2. The box body according to claim 1, comprising a partition member which is a plate-shaped member cut out from the fiberboard and assembled in an upright position inside an area surrounded by a plurality of the wall members between the pair of flat plate members, the partition member having a main body and a protrusion which protrudes from the main body in the upright direction and fits into the mounting portion.

3. The box according to claim 2 , further comprising a plurality of the partition members, the plurality of partition members being arranged in a lattice pattern.

4. The box according to claim 1 , wherein an outer surface of the protrusion and an inner surface of the mounting portion are fitted together in a state in which the outer surface and the inner surface of the mounting portion are plastically deformed relative to each other.

5. The pair of flat plate members are rectangular, The wall members are provided in four locations corresponding to four sides of an outer edge of the flat plate member, A box body as described in any one of claims 1 to 3, wherein the flat plate member and the two wall members form a corner portion of the box body, and the corner portion is configured such that the corners of the three faces formed by the flat plate member and the two wall members coincide with each other.

6. An interior board for a vehicle, comprising the box according to claim 5 and a skin material covering the box.

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