decorative panels

Abstract

To provide a decorative plate provided with a visually recognizable groove.SOLUTION: According to a decorative plate 1, the decorative plate 1 comprises a substrate 4, and a decorative sheet 5 adhesively attached to a surface 4a of the substrate 4. The substrate 4 comprises a substrate body 40, and a groove formation part 600 obtained by forming an approximately trapezoidal groove 6 in cross-sectional view, that is wider in width toward a surface side. The groove formation part 600 comprises a plate-like bottom formation part 610 thinner in thickness than the substrate body 40, that forms a bottom part 61 of the groove 6; and a side wall formation part 620 whose second side face 622 adjacent to a first side face 621 that forms a side wall face 62a of the groove 6 via a first side 623 that forms an opening edge of the groove 6 is adhesively attached to a side face 40a of the substrate body 40, that is formed in a substantially triangular column shape for forming a side wall part 62 of the groove 6. The decorative sheet 5 is continuously arranged astride a face of the substrate body 40, the first side face 621 of the side wall formation part 620, and a face of the bottom formation part 610.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to decorative laminates. [Background technology]

[0002] Conventionally, a decorative board has been proposed in which a groove is formed in the substrate of the decorative board from the back side, and the substrate is pressed from the front side to adhere the groove so as to close it, thereby forming a groove in the substrate (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-293364 Summary of the Invention [Problem to be solved by the invention]

[0004] If the groove area is small or shallow, the groove is difficult to see from the surface side of the decorative board. For this reason, there is a demand for decorative boards in which the groove is easy to see and which contributes to the design. [Means for solving the problem]

[0005] The present disclosure relates to a decorative board comprising a substrate and a decorative sheet adhered to the surface of the substrate, wherein the substrate comprises a substrate main body and a groove forming portion forming a groove that is approximately trapezoidal in cross section and that is wider toward the surface side, the groove forming portion comprising a plate-like bottom forming portion that forms the bottom of the groove and is thinner than the substrate main body, and a side wall forming portion that is approximately triangular prism-shaped and forms the side wall of the groove, and has a second side that is adjacent to a first side that forms the side wall surface of the groove via a first side edge that forms the opening edge of the groove and is adhered to the side of the substrate main body, and the decorative sheet is continuously arranged across the surface of the substrate main body, the first side of the side wall forming portion, and the surface of the bottom forming portion. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 2 is a front view of the door body of the present embodiment. [Figure 2] FIG. 2 is a front view of the door body of the present embodiment with the decorative panel removed. [Figure 3] FIG. 2 is a partial plan view of the door body of the present embodiment. [Figure 4] FIG. 2 is a cross-sectional view of the decorative board of the present embodiment. [Figure 5A] FIG. 2 is a diagram showing a precursor of the decorative sheet of the present embodiment before grooves are formed. [Figure 5B] FIG. 10 is a view showing a precursor of the decorative board of the present embodiment in the process of forming grooves therein. DETAILED DESCRIPTION OF THE INVENTION

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. As shown in Fig. 1, a door body 10 is a hinged door that is placed in an opening 100 of a building and opens and closes the opening 100.

[0008] The door body 10 is a plate-like member. The door body 10 has a roughly rectangular shape and comprises decorative panels 1 arranged on the front and back surfaces of the door body 10, a frame 2 arranged between the decorative panels 1, and a honeycomb material 3 as a support member (see Figure 2). The door body 10 has a design on its flat surface due to grooves 6 provided in the decorative panels 1.

[0009] As shown in Figure 2, the frame body 2 is a square frame arranged on the back side of the decorative panel 1 along the outer edge of the door body 10. The frame body 2 has an upper frame 21, a lower frame 22, and a pair of vertical frames 23, which are framed in a square shape. The upper frame 21 extends in the left-right direction at the top of the frame body 2 when viewed from the front. The lower frame 22 extends in the left-right direction at the bottom of the frame body 2 when viewed from the front. The vertical frame 23 connects the left and right ends of the upper frame 21 and the lower frame 22 and extends in the up-down direction.

[0010] The honeycomb material 3 is a member that reinforces the door body 10. As shown in Figure 3, the honeycomb material 3 is placed on the back side of each decorative panel 1, between the decorative panel 1 placed on the front side of the door body 10 and the decorative panel 1 placed on the back side. The honeycomb material 3 is made by assembling thick cardboard into a shape such as a turtle cell or a parallelogram, and is a highly rigid reinforcing material with multiple identical three-dimensional shapes called cells.

[0011] The decorative board 1 has a substrate 4, a decorative sheet 5, and a groove 6. The substrate 4 is a board material made of, for example, medium density fiberboard (MDF). The substrate 4 has a substrate main body 40, a groove-forming portion 600, and an adhesive layer 7. The substrate main body 40 is a board material that serves as the base material for the approximately rectangular decorative board 1. The groove-forming portion 600 and the adhesive layer 7 will be described in detail later.

[0012] The decorative sheet 5 is a member having a thin surface that is adhered to the substrate surface 4a, which is the surface of the substrate 4, and is configured by printing a desired color or pattern on the decorative sheet surface 5a, which is the surface of the decorative sheet 5.

[0013] The groove 6 is formed by recessing the substrate 4 and the decorative sheet 5. As shown in FIG. 1, the groove 6 is formed along the longitudinal direction of the door body 10. The groove 6 is arranged according to the design of the door body 10. Depending on the design, the groove 6 may be arranged along the lateral direction, or may be formed along various directions. As shown in FIGS. 3 and 4, the groove 6 is open at the top and has a generally trapezoidal cross-sectional shape that widens toward the substrate front surface 4a. The groove 6 has a bottom 61 and sidewalls 62. The bottom 61 extends flat on the substrate back surface 4b, which is the back surface of the substrate 4. As shown in FIG. 3, the bottom 61 is supported in direct contact with the honeycomb material 3 and serves as a contact surface between the honeycomb material 3 and the decorative panel 1. The sidewalls 62 slope upward from the bottom 61.

[0014] The groove forming portion 600 is a portion of the groove 6 that is configured by the substrate 4 and is formed by the substrate 4. The groove forming portion 600 has a bottom forming portion 610 that forms the bottom 61, and a side wall forming portion 620 that forms the side wall 62.

[0015] The bottom forming portion 610 is a part of the substrate 4 that forms the bottom 61 of the groove 6, and has a plate-like shape that is thinner than the substrate main body 40. The bottom forming portion 610 is disposed on the rear surface 4b side of the substrate.

[0016] The side wall forming portion 620 has a generally triangular prism shape in cross section that forms the side wall 62. As shown in FIG. 4 , the side wall forming portion 620 has a first side surface 621, a second side surface 622, a first side edge 623, and a second side edge 624.

[0017] The first side surface 621 is one surface of the side wall portion forming portion 620 that is roughly triangular prism-shaped in cross section, and is arranged on the side that directly faces the side wall portion 62 of the groove 6. The first side surface 621 has a decorative sheet 5 adhered to its surface and is located on the side wall surface 62a of the side wall portion 62. As shown in FIG. 4 , the decorative sheet 5 is continuously arranged and adhered across the first side surface 621, the surface of the substrate body 40, and the surface 610a of the bottom portion forming portion 610.

[0018] The first side edge 623 is located at the upper end of the first side surface 621 and is the edge that forms the opening edge of the groove 6. The first side edge 623 extends along the longitudinal direction of the door body 10 at the upper end of the groove 6. Because the decorative sheet 5 is adhered to the substrate surface 4a, FIG. 4 shows the decorative sheet 5 covering the first side edge 623. Because the decorative sheet 5 is thin, the first side edge 623 and the decorative sheet 5 together form the opening edge of the groove 6.

[0019] The second side edges 624 are located at the lower ends of the first side surfaces 621 and at both widthwise ends of the bottom 61 of the groove 6. As in the case of the first side edges 623, the decorative sheet 5 is adhered to the surface of the second side edges 624, and together with the decorative sheet 5, they form edges on both widthwise ends of the bottom surface 61a of the bottom 61. The second side edges 624 form connecting edges that connect the side wall forming portions 620 to the bottom forming portion 610.

[0020] The second side surface 622 is adjacent to the first side surface 621 via the first side edge 623, and is bonded to the side surface 40a of the substrate body 40. The second side surface 622 extends at an angle in a direction away from the bottom 61, with the first side edge 623 as a base point.

[0021] The adhesive layer 7 is formed of an adhesive that bonds the side surface 40a of the substrate body 40 that is located on the groove formation portion 600 side to the second side surface 622. The adhesive layer 7 is inclined in a direction away from the groove 6 from the substrate front surface 4a toward the substrate back surface 4b.

[0022] The decorative board 1 described above is formed by processing a precursor 400, which is a precursor to the substrate 4 that will form the substrate 4. The precursor 400 is formed by cutting a sheet material that will eventually become the substrate 4. As shown in FIG. 5A, the precursor 400 has a substrate body 40, a groove-forming recess 41, an adhesive layer-forming recess 42, and a planned sidewall portion 43, and is cut to form the recess from the back surface side toward the front surface side. The front surface of the precursor 400 is the surface that will later form the substrate front surface 4a, and the back surface of the precursor 400 is the surface that will later form the substrate back surface 4b.

[0023] The groove forming recess 41 is disposed at a position where the groove 6 of the substrate 4 is to be formed. The groove forming recess 41 has a generally trapezoidal shape that is open on the back surface side of the precursor 400. The groove forming recess 41 has an upper bottom 411, a lower bottom 412, side edges 413, and protrusions 414.

[0024] The upper bottom 411 is disposed on the surface side of the precursor 400. Most of the upper bottom 411 is composed of a flat surface. The upper bottom 411 is located slightly below the surface of the precursor 400, and there is a thickness of, for example, about 1.5 mm between the upper bottom 411 and the surface. This thick portion between the upper bottom 411 and the surface is the portion that will become the bottom forming portion 610 of the substrate 4 after processing, and the bottom 61 of the groove 6 is formed together with the decorative sheet 5 adhered thereon.

[0025] The lower bottom 412 is disposed in an open area on the back surface side because the groove forming recess 41 is formed by cutting the back surface of the precursor 400. The lower bottom 412 is a conceptual part that is assumed to be on an imaginary line obtained by extending the back surface of the precursor 400 horizontally.

[0026] The side edge 413 is an edge that slopes downward from the upper bottom 411, and connects the upper bottom 411 and the lower bottom 412. The slope angle of the side edge 413 changes near the approximate center in the up-down direction, and the side edge 413 has an upper side edge 413a and a lower side edge 413b.

[0027] The upper side edge 413a is a side edge that slopes downward from the upper end of the side edge 413 and extends below approximately the center of the side edge 413 in the up-down direction. The upper side edge 413a slopes outward in the width direction as it slopes downward. The upper side edge 413a is disposed on one side and the other side in the width direction of the groove forming recess 41. The upper side edge 413a slopes at an angle different from that of the lower side edge 413b, which will be described later. With respect to an imaginary line drawn vertically downward from the upper end of the side edge 413, the slope angle of the upper side edge 413a is smaller and steeper than the slope angle of the lower side edge 413b.

[0028] The lower side edge 413b is an edge that slopes from the lower end of the upper side edge 413a toward the lower bottom 412. The lower side edge 413b is disposed on one side and the other side of the groove-forming recess 41 in the width direction. The lower side edge 413b slopes outward in the width direction as it extends downward. The lower side edge 413b slopes at a different angle than the upper side edge 413a. The slope angle of the lower side edge 413b with respect to an imaginary line drawn vertically downward from the upper end of the side edge 413 is greater and gentler than the slope angle of the upper side edge 413a. As shown in FIG. 5A , the angle θ1 formed by an imaginary line extending from the lower side edge 413b on one side in the width direction to the lower side edge 413b on the other side, passing through the lower end of the upper side edge 413a connected thereto, is approximately 40 to 60 degrees.

[0029] The protrusions 414 are formed by both ends of the groove-forming recess 41 in the width direction protruding upward in a cross-sectional view. The protrusions 414 are arranged on one side and the other side of the groove-forming recess 41 in the width direction. The protrusions 414 are formed at an acute angle with the upper end of the groove-forming recess 41 as the vertex 414a. The angle θ2 formed between the upper side edge 413a and the protrusion-part inner edge 414b extending from the outer end of the upper base 411 in the width direction toward the vertex 414a is approximately 20 degrees.

[0030] The adhesive layer formation recess 42 is positioned adjacent to the groove formation recess 41 on one side and the other side in the width direction of the groove formation recess 41 in a cross-sectional view. The adhesive layer formation recess 42 is a roughly triangular recess with two sides 42a and 42b extending downward from the front surface side of the precursor 400. The back surface side of the adhesive layer formation recess 42 is open, and the open side forms the base of the roughly triangle. The lower end of the adhesive layer formation recess 42 on the groove formation recess 41 side is connected to the lower end of the groove formation recess 41 on the adhesive layer formation recess 42 side. The adhesive layer formation recess 42 is formed with the front surface side of the decorative board 1 as its apex, with one side 42a and the other side 42b forming an angle θ3 of approximately 70 degrees. An adhesive is applied to the one side 42a and the other side 42b in advance. The applied adhesive forms the adhesive layer 7 after processing.

[0031] The planned side wall portion 43 is a portion that connects the upper end of the other side 42b of the adhesive layer formation recess 42 and the apex 414a of the protruding portion 414 of the groove formation recess 41. As shown in FIGS. 5A and 5B, the planned side wall portion 43 is a part of the surface of the precursor 400.

[0032] A method for manufacturing the decorative board 1 by processing the precursor 400 will be described. The precursor 400 has the back side cut while the decorative sheet 5 is adhered to the front side. In the precursor placement step S1, the precursor 400 with the back side cut is prepared and placed in a predetermined position in the space where the decorative board 1 will be manufactured.

[0033] As shown in Fig. 5A, a pair of clamping members 9 having an upper clamping member 91 and a lower clamping member 92 are arranged above and below the upper bottom portion 411. The upper surface of the lower clamping member 92 is fixed so as to be positioned on the lower bottom portion 412 of the precursor 400. The upper clamping member 91 descends in the direction of the white arrow in Fig. 5A towards the upper bottom portion 411 so that its lower surface comes into contact with the decorative sheet 5 adhered onto the upper bottom portion 411.

[0034] In the moving step S2, as shown in FIG. 5B, the upper bottom portion 411 of the groove forming recess 41 is pressed by an upper clamping member 91, and the upper bottom portion 411 is moved downward toward the back surface of the precursor 400. The upper clamping member 91 descends until it clamps the upper bottom portion 411 and a portion of the decorative sheet 5 between itself and a lower clamping member 92 fixed below. Then, as shown by the black arrows in the adhesive layer forming recess 42 in FIG. 5B, during the moving step S2, one side 42a and the other side 42b of the adhesive layer forming recess 42 are moved toward each other by the pressing of the upper bottom portion 411, and are bonded to each other as shown in FIG. 4. The adhesive layer 7 is formed by bonding the one side 42a and the other side 42b.

[0035] The moving step S2 moves the side edge 413 of the groove forming recess 41 toward the back surface. Also, the planned side wall portion 43 between the upper end of the other side 42b of the adhesive layer forming recess 42 and the apex of the protruding portion 414 of the groove forming recess 41 is recessed toward the bottom 61 of the groove 6. As a result, the planned side wall portion 43 forms the side wall portion 62 of the groove 6. More specifically, the planned side wall portion 43 forms the first side surface 621 of the side wall portion forming portion 620. The upper bottom portion 411 moves toward the back surface and forms the bottom 61 of the groove 6. At this time, the decorative sheet 5 is recessed following the substrate 4, and forms the groove 6 together with the substrate 4.

[0036] 4 is a cross-sectional view of the decorative board 1, and in order to show the correspondence with the precursor 400, the symbols in the precursor 400 are also shown in the drawing of the substrate 4. In FIGS. 4, 5A, and 5B, the first side surface 621, the second side surface 622, and the substantially triangular bottom surface of the side wall portion forming portion 620, the side edge portion 413 of the precursor 400, the planned side wall portion 43, and the other side 42b of the adhesive layer forming recess 42 are shown with solid lines, thick dashed lines, and dashed lines to indicate that the parts are common before and after processing from the precursor 400 to the substrate 4.

[0037] As shown in FIGS. 5A and 5B, the upper side edge 413a and the lower side edge 413b of the side edge 413 of the precursor 400 are inclined at different angles. Therefore, as shown in FIG. 4, after processing the precursor 400, when the lower side edge 413b is positioned along the back surface, the upper side edge 413a is inclined upward. This causes the protrusion 414 of the groove-forming recess 41 to be slightly raised from the back surface. In this state, the protrusion 414 forms both widthwise edges of the bottom surface 61a of the bottom 61 of the groove 6. Specifically, when the upper bottom 411 forms the bottom 61, the protrusion 414 supports the backside of a corner 53 of the decorative sheet 5 where the decorative sheet bottom 51 of the decorative sheet 5, which is positioned on the upper bottom 411 of the precursor 400 and provided on the bottom 61 of the groove 6, intersects with the decorative sheet side portion 52, which is positioned on the intended side wall portion 43 and provided on the side wall portion 62 of the groove 6.

[0038] This embodiment provides the following advantages. The decorative board 1 includes a substrate 4 and a decorative sheet 5 bonded to the substrate surface 4a of the substrate 4. The substrate 4 includes a substrate main body 40 and a groove forming portion 600 that forms a groove 6 that is generally trapezoidal in cross section and whose width increases toward the substrate surface 4a. The groove forming portion 600 includes a plate-like bottom forming portion 610 that forms the bottom 61 of the groove 6 and is thinner than the substrate main body 40, and a sidewall forming portion 620 that is generally triangular prism-shaped and forms the sidewall 62 of the groove 6. The second side surface 622 is adjacent to a first side surface 621 located on the sidewall surface 62a of the groove 6 via a first side edge 623 that forms the opening edge of the groove 6 and is bonded to the side surface 40a of the substrate main body 40. The decorative sheet 5 is continuously disposed across the surface of the substrate main body 40, the first side surface 621 of the sidewall forming portion 620, and the surface of the bottom forming portion 610. Because the groove 6 is approximately trapezoidal, the inclined side wall portion 62 casts a shadow on the groove 6, making it easier to see from the outside. This makes the presence of the groove 6 more likely to contribute to the design of the decorative panel 1. The groove forming portion 600, which has a thin plate-like bottom forming portion 610 and an approximately triangular prism-shaped side wall forming portion 620, allows the approximately trapezoidal groove 6 to be formed using only the decorative panel 1, without using a separate resin molding material or the like. This further improves the design of the groove 6 and also improves workability. Furthermore, since the groove 6 is formed by the groove forming portion 600, which has a bottom forming portion 610 and a side wall forming portion 620, when the decorative sheet 5 is continuously placed across the surface of the substrate main body 40, the first side surface 621 of the side wall forming portion 620, and the surface of the bottom forming portion 610, the corners of the first side edge 623 connecting the substrate surface 4a and the first side surface 621 and the second side edge 624 connecting the first side surface 621 and the bottom forming portion 610 become clear, making the shape of the trapezoidal groove 6 clearer.

[0039] According to this embodiment, the adhesive layer 7 that bonds the second side surface 622 of the side wall portion forming portion 620 to the side surface 40a of the substrate body 40 is inclined in a direction away from the groove 6 as it approaches the back surface. This makes it possible to bond the substantially triangular prism-shaped side wall portion forming portion 620 to the substrate body 40, and ultimately makes it possible to form a substantially trapezoidal groove 6. Therefore, the same effects as those described above are achieved.

[0040] According to this embodiment, the second side edge 624 of the side wall portion forming portion 620 is disposed so as to form a connecting edge connected to the bottom portion forming portion 610 and also form an edge of the bottom surface 61a of the groove 6. The second side edge 624 extends as an edge to the corner where the side wall portion 62 and the bottom portion 61 are connected. Therefore, the boundary between the side wall portion 62 and the bottom portion 61 of the approximately trapezoidal groove 6 is clear, improving the visibility of the approximately trapezoidal groove 6.

[0041] According to this embodiment, the manufacturing method of the decorative board 1 includes a precursor placement step S1 in which a precursor 400 of a substrate 4 is placed. The precursor 400 includes a substantially trapezoidal groove-forming recess 41 positioned at a position where the groove 6 is to be formed, and a substantially triangular adhesive layer-forming recess 42, which is positioned on one side and the other side of the width direction of the groove-forming recess 41 in a cross-sectional view and has two sides extending downward from the front surface of the precursor 400. The groove-forming recess 41 includes an upper bottom 411 positioned on the front surface of the precursor 400, and a side edge 413 extending downward at an incline from the upper bottom 411. The manufacturing method also includes a moving step S2 in which the upper bottom 411 is moved toward the back surface of the precursor 400, and an adhesive layer-forming step S3 in which, during the moving step S2, the two sides of the adhesive layer-forming recess 42 are moved toward each other and bonded together to form the adhesive layer 7. The groove-forming recess 41 forms the groove 6 by the moving step S2. By moving the adhesive layer forming recess 42 while moving the upper bottom portion 411 of the groove forming recess 41 downward, it is possible to form a substantially trapezoidal groove 6 without having to fit a separate resin molding material or the like into the substrate 4, further improving the design of the groove 6 and also improving workability. Because the groove 6 is substantially trapezoidal, the inclined side wall portions 62 cast a shadow on the groove 6, making it easier to see from the outside. This makes the presence of the groove 6 more likely to contribute to the design of the decorative board 1.

[0042] According to this embodiment, the precursor 400 is configured to include protrusions 414 that protrude upward from both ends of the width direction of the groove forming recess 41 in a cross-sectional view. The protrusions 414 are configured to form the edges of the bottom surface 61a of the groove 6 after the moving step S2. This causes the apex of the protrusion 414 to be located at the corner where the side wall 62 and the bottom 61 are connected. The boundary between the side wall 62 and the bottom 61 of the approximately trapezoidal groove 6 is clear, improving the visibility of the approximately trapezoidal groove 6.

[0043] According to this embodiment, it is possible to obtain a door body 10 that has the above-mentioned decorative panel 1 and opens and closes an opening 100 in a building. Therefore, it is possible to obtain a door body 10 in which the visibility and design of the groove 6 are improved.

[0044] According to this embodiment, the door body 10 is configured to include a plate-shaped honeycomb material 3 placed on the back side of the decorative panel 1, and the bottom 61 of the groove 6 is directly supported by the honeycomb material 3. Because the groove 6 has a substantially trapezoidal shape, it can be positioned so that the substantially trapezoidal bottom 61 is supported by the honeycomb material 3. Since it is not necessary to place a core material separately from the honeycomb material 3 on the back side of the groove 6 to support and reinforce the groove 6, there is no need to change the placement of the core material inside the door body 10 depending on the placement of the groove 6, which simplifies the design of the door body 10 and improves workability.

[0045] The present disclosure is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present disclosure. The dimensions and the like described above are merely examples and can be changed as appropriate.

[0046] In the above embodiment, the decorative panel 1 is provided on the door body 10, but the present invention is not limited to this. For example, the decorative panel 1 may be provided on a wall surface or ceiling in a room. [Explanation of symbols]

[0047] 1 decorative plate, 3 honeycomb material (support member), 4 substrate, 4a surface, 5 decorative sheet, 6 groove, 7 adhesive layer, 10 door body, 40 substrate body, 40a side surface, 41 groove forming recess, 42 adhesive layer forming recess, 61 bottom, 61a bottom surface, 62 side wall portion, 62a side wall surface, 400 precursor, 411 upper bottom portion, 413 side edge portion, 414 protrusion portion, 600 groove forming portion, 610 bottom forming portion, 610a surface, 620 side wall forming portion, 621 first side surface, 622 second side surface, 623 first side edge, 624 second side edge

Claims

1. A decorative board comprising a substrate and a decorative sheet adhered to a surface of the substrate, The substrate is A substrate body, a groove forming portion that forms a groove having a generally trapezoidal cross section, the width of which increases toward the front surface side; The groove forming portion is a flat groove portion; a sidewall portion inclined upward from the bottom of the groove; a plate-like bottom forming portion that forms the bottom and has a thickness thinner than that of the substrate body; a sidewall forming portion having a substantially triangular prism shape that forms the sidewall portion, and a second side surface that is adjacent to a first side surface located on a sidewall surface of the groove via a first side edge that forms an opening edge of the groove, and that is bonded to a side surface of the substrate body; the decorative sheet is disposed continuously across the surface of the substrate body, the first side surface of the sidewall portion-forming portion, and the surface of the bottom portion-forming portion; the sidewall portion forming portion has the same height as the height from the front surface to the back surface of the substrate body, A decorative board in which the side wall forming portion has a first side edge portion and a second side edge portion extending in a direction different from the first side edge portion and connected to the first side edge portion, the first side edge portion being located on the back side of the substrate main body, and the second side edge portion being inclined from the connection portion with the first side edge portion toward the bottom forming portion.

2. The decorative board according to claim 1 , wherein an adhesive layer that bonds the second side surface of the sidewall portion forming portion and the side surface of the substrate body is inclined in a direction away from the groove toward the rear surface side.

3. The decorative board according to claim 1 or 2, wherein a second side edge of the side wall forming portion forms a connecting edge connected to the bottom forming portion and forms an edge of the bottom surface of the groove.

4. A method for manufacturing a decorative board according to claim 1, a precursor disposing step of disposing a precursor on the substrate, The precursor is a substantially trapezoidal groove forming recess disposed at a position where the groove is to be formed; and a substantially triangular adhesive layer forming recess having two sides extending downward from the surface side of the precursor, the two sides being disposed on one side and the other side in a width direction of the groove forming recess in a cross-sectional view, the groove-forming recess has an upper bottom portion disposed on the surface side of the precursor and a side edge portion extending obliquely downward from the upper bottom portion, a moving step of moving the upper bottom portion to a back surface side of the precursor; an adhesive layer forming step in which the two sides of the adhesive layer forming recess are moved toward each other during the moving step, and are bonded together to form an adhesive layer; The method for manufacturing a decorative board, wherein the groove-forming recessed portion forms the groove by the moving step.

5. the precursor has protruding portions that protrude upward at both ends in a width direction of the groove forming recess in a cross-sectional view, The method for manufacturing a decorative board according to claim 4 , wherein the protrusion forms an edge of a bottom surface of the groove after the moving step.

6. A door body for opening and closing an opening in a building, comprising the decorative panel according to claim 1 or 2.

7. A plate-shaped support member is provided on the back side of the decorative board, The door body according to claim 6, wherein the bottom of the groove is directly supported by the support member.

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