Lightweight top board for desk

Abstract

To provide a lightweight top board for a desk in which a decorative laminate is less likely to peel from a core material.SOLUTION: A lightweight top board for a desk 1 is configured by laminating a first decorative laminate 21 constituting a top surface of a top board of the desk, a second decorative laminate 22 constituting a lower surface of the top board, and a core material layer 3 disposed between the first decorative laminate 21 and the second decorative laminate 22. The core material layer 3 includes: a tabular core material 31 composed of a foamed synthetic resin; and a synthetic resin film 32 welded to each of both surfaces of the core material 31.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a lightweight desk top. [Background technology]

[0002] 2. Description of the Related Art There has been a demand for lightweight desks that are easy to carry around. The desk top makes up a large portion of the desk's weight, and there is a particular demand for the weight of the desk top to be reduced.

[0003] Patent Document 1 discloses an example of a lightweight tabletop. The lightweight tabletop described in Patent Document 1 includes a plate-shaped core material made of expanded polystyrene and decorative panels provided on both sides of the core material. The core material and the decorative panels are bonded together with an adhesive. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3201410 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the lightweight tabletop of Patent Document 1 has a problem in that the decorative plate is easily peeled off from the core material.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a lightweight desk top in which the decorative panel is not easily peeled off from the core material. [Means for solving the problem]

[0007] The lightweight desk top of the present invention is a lightweight desk top laminated with a first decorative panel that forms the top surface of the desk top, a second decorative panel that forms the underside of the top, and a core material layer provided between the first decorative panel and the second decorative panel, and the core material layer comprises a plate-shaped core material made of foamed synthetic resin and synthetic resin films welded to both sides of the core material. Effect of the Invention

[0008] According to the present invention, it is possible to provide a lightweight desk top in which the decorative panel is not easily peeled off from the core material. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an example of a desk equipped with a lightweight desk top according to one embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view of a lightweight desk top according to an embodiment of the present invention, taken in the thickness direction of the top. [Diagram 3] 1 is a diagram showing the core layer of a lightweight desk top according to an embodiment of the present invention with the decorative panel removed, viewed from the top surface side of the top. FIG. [Figure 4] 1 is a view of a lightweight desk top according to one embodiment of the present invention, viewed from the top surface side of the top. [Diagram 5] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 6] 5 is a cross-sectional view taken along line BB in FIG. [Figure 7] 5 is a cross-sectional view taken along line CC in FIG. [Figure 8] FIG. 2 is a cross-sectional view of a desk with a lightweight desk top according to an embodiment of the present invention, taken along a thickness direction of the desk top. [Figure 9] FIG. 11 is a perspective view showing yet another example of a desk equipped with a lightweight desk top according to one embodiment of the present invention. [Figure 10] 10 is a partial cross-sectional view showing the members constituting the top plate in FIG. 9 in a pre-assembled state. [Figure 11] 10 is a partial cross-sectional view of the top plate of FIG. 9 taken along a cutting line including the mounting member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a lightweight desk top according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment shown below is merely an example, and the lightweight desk top of the present invention is not limited to the following embodiment.

[0011] As shown in FIG. 1, the lightweight desk top 1 of this embodiment constitutes the top of a desk T. As shown in FIG. 1, the desk T has a lightweight desk top 1 (hereinafter simply referred to as the top 1) and a number of legs L attached to the top 1. In this embodiment, the legs L are provided at the four corners of the desk T. Although details will be described later, the legs L are attached to the underside of the top 1 by screws S via leg attachment parts M (see FIG. 2). In the example shown in FIG. 2, the leg attachment parts M are flange parts provided on the upper parts of the legs L. The leg attachment parts M have screw holes (not shown) through which the legs of the screws S can be inserted.

[0012] In this specification and drawings, the direction D1 represents the height direction (vertical direction) of the desk T, the direction D2 represents the longitudinal direction of the desk T (longitudinal direction of the top board 1), and the direction D3 represents the width direction of the desk T (width direction of the top board 1). The directions D1, D2, and D3 are mutually perpendicular. The length of the top board 1 in the direction D2 may be the same as the length of the top board 1 in the direction D3. For example, the top board 1 may be square or circular. In the following, the directions D1, D2, and D3 are used for explanation in both a state in which the top board 1 and the leg L are connected and a state in which the connection between the top board 1 and the leg L is released (a state in which the leg 2 is removed from the top board 1). In the following, the upper side in the direction D1 is also referred to as the "top side", and the lower side in the direction D1 is also referred to as the "lower side".

[0013] The tabletop 1 is a member supported by legs L and given a predetermined height. The tabletop 1 can have an object placed on its top surface, or can be used to eat or work. The shape of the tabletop 1 is not particularly limited as long as the object can be placed on its top surface, or can be used to eat or work. In the example shown in FIG. 1 and FIG. 4, the tabletop 1 is formed in a substantially rectangular plate shape. The tabletop 1 has legs L detachably attached to one surface (lower surface) in the direction D1 via leg attachment parts M. The tabletop 1 may have a shape other than a substantially rectangular shape, and may have other shapes such as a substantially elliptical shape, a substantially circular shape, or a substantially square shape.

[0014] As shown in Figure 2, the table top 1 of this embodiment has a laminated structure of a first decorative panel 21 that forms the top surface of the table top 1 of the desk T, a second decorative panel 22 that forms the underside of the table top 1, and a core material layer 3 provided between the first decorative panel 21 and the second decorative panel 22.

[0015] The first decorative board 21 and the second decorative board 22 are decorative boards that constitute the upper and lower surfaces (top and bottom surfaces) of the tabletop 1. The first decorative board 21 and the second decorative board 22 may be made of the same material or different materials. The material of the first decorative board 21 and the second decorative board 22 is not particularly limited as long as the surface strength and durability of the top and bottom surfaces of the tabletop 1 can be ensured. In this embodiment, the first decorative board 21 and the second decorative board 22 are decorative boards containing a hard synthetic resin. By joining the first decorative board 21 and the second decorative board 22 containing a hard synthetic resin to one surface (top surface side surface) and the other surface (bottom surface side surface) of the core material layer 3, respectively, a tabletop 1 that is strong and does not easily warp can be provided. That is, by joining the hard first decorative board 21 and the hard second decorative board 22 to both sides of the core layer 3, both sides of the core layer 3 can be reinforced in a well-balanced manner compared to a case in which a decorative board is joined to only one side of the core layer 3. Therefore, the strength of the tabletop 1 can be increased and warping of the tabletop 1 can be suppressed.

[0016] In this embodiment, from the viewpoint of surface hardness and durability, for example, a melamine decorative board is used as the first decorative board 21 and the second decorative board 22. Note that the first decorative board 21 and the second decorative board 22 are not limited to a melamine decorative board, and for example, a known decorative board such as a polyester decorative board, a polyvinyl chloride decorative board, a polyolefin-based decorative board, or a wooden decorative board may be used.

[0017] The thickness of the first decorative board 21 and the second decorative board 22 is not particularly limited, but may be, for example, 0.3 to 3.0 mm, and preferably 1.0 to 2.0 mm, from the viewpoint of reducing the weight of the tabletop 1. The size of the first decorative board 21 and the second decorative board 22 is appropriately selected according to the size of the tabletop 1.

[0018] As shown in FIG. 2, the core layer 3 is a layer provided between the first decorative board 21 and the second decorative board 22. The core layer 3 (see FIG. 2, FIG. 5 to FIG. 7) includes a plate-shaped core 31 made of a foamed synthetic resin and a synthetic resin film 32 welded to both sides of the core 31. In this embodiment, the core 31 and the synthetic resin film 32 have substantially the same size when viewed from the direction D1. Moreover, the core 31 and the synthetic resin film 32 have substantially the same shape when viewed from the direction D1. In this embodiment, the core layer 3 has a shape of a substantially rectangular plate-like body with four corners cut out (see FIG. 3 and FIG. 6). The core layer 3 can be easily formed, for example, by cutting the four corners of the plate of the core layer 3 formed in a rectangular shape. The thickness of the core layer 3 can be appropriately changed according to the design of the top plate 1, and is not particularly limited, but can be, for example, 10 to 60 mm, preferably 20 to 40 mm.

[0019] The core layer 3 may be one in which the peel strength of the synthetic resin film 32 to the core 31 (measured by a peel test conforming to JIS Z0237) is high, for example, about 3 to 5 N / cm. In this case, the core layer 3 can be one in which the synthetic resin film 32 is difficult to peel off from the core 31. The peel test can be performed, for example, by removing a 24 mm wide strip of synthetic resin film 32 heat-welded to the surface of the core 31 at a peel angle of about 180°, a peel speed of 5 mm / sec, a peel length of 187 mm, and a measurement record of N / 10 mm, taking an average value every 50 mm.

[0020] The type of foamed synthetic resin constituting the core material 31 (see Figs. 2, 5 to 7) is not particularly limited as long as it has the strength required for the core material and the light weight due to foaming. In this embodiment, the core material 31 is made of foamed polystyrene (expanded polystyrene) molded into a plate shape. Note that the material of the core material 31 is not limited to foamed polystyrene, and may be, for example, other foamed synthetic resins such as foamed polyurethane.

[0021] The foamed synthetic resin used for the core material 31 is preferably one with a medium to high foaming ratio (medium or high foaming), and for example, one with a specific gravity of 0.02 to 0.05, more preferably about 0.03 can be used. This makes the core material 31, which constitutes most of the top plate 1, lightweight, and therefore the weight of the top plate 1 can be significantly reduced. As the foamed polystyrene for the core material 31, for example, bead method expanded polystyrene (EPS) or extruded polystyrene (XPS) can be used.

[0022] In this embodiment, the core material 31 is made of a hard foamed synthetic resin. Specifically, the core material 31 is made of, for example, hard foamed polystyrene (Styrofoam). This allows the core material 31 to have the strength required for a core material.

[0023] The synthetic resin film 32 (see Figs. 2, 5 to 7) is a member that is welded to both sides (the top side and the bottom side) of the core material 31. The synthetic resin film 32 is welded to one side (the top side) of the core material 31, and the first decorative plate 21 is adhered to the side (the top side) opposite the core material 31. The synthetic resin film 32 is welded to the other side (the bottom side) of the core material 31, and the second decorative plate 22 is adhered to the side (the bottom side) opposite the core material 31.

[0024] By welding the synthetic resin film 32 to the core material 31, the synthetic resin film 32 is firmly integrated with both sides of the core material 31. When an external force in the peeling direction is applied to the first decorative board 21 or the second decorative board 22 bonded to the synthetic resin film 32 integrated with the core material 32, the synthetic resin film 32 strongly resists the peeling force (external force in the peeling direction) of the first decorative board 21 or the second decorative board 22 against the core material 32. This is considered to be because the synthetic resin film 32 is firmly integrated with both sides of the core material 31, so that the surface portion of the core material 31 is protected by the synthetic resin film 32, and breakage of the surface portion of the core material 31 due to the peeling force is suppressed. Therefore, peeling of the first decorative board 21 and the second decorative board 22 from the core material 32 can be prevented. In contrast, in a tabletop having a structure in which a decorative plate is directly bonded to the surface of a core material made of expanded polystyrene as in Patent Document 1, when an external force is applied to the decorative plate in the peeling direction, the surface portion of the core material is easily broken by the peeling force due to the fragility of the surface portion of the core material, and the broken surface portion of the core material is easily peeled off while still attached to the decorative plate. For this reason, the tabletop of Patent Document 1 has a problem that the decorative plate is easily peeled off from the core material. In contrast, the tabletop 1 according to this embodiment has a structure in which the first decorative plate 21 and the second decorative plate 22 are bonded to the synthetic resin film 32 welded to the core material 31, so such a problem does not occur.

[0025] In this manner, in this embodiment, the synthetic resin film 32 is firmly integrated on both sides of the core material 31, and the first decorative plate 21 and the synthetic resin film 32 are bonded to the synthetic resin film 32, thereby obtaining a tabletop 1 in which the first decorative plate 21 and the second decorative plate 22 are not easily peeled off from the core material 31. In addition, by welding the synthetic resin film 32 to both sides of the core material 31, the strength of the tabletop 1 is improved compared to the structure in which the synthetic resin film 32 is not welded (tabletop in Patent Document 1). Moreover, the core material 31 made of foamed synthetic resin is lightweight. Therefore, it is possible to provide a tabletop 1 in which the first decorative plate 21 and the second decorative plate 22 are not easily peeled off from the core material 31 and which has improved strength. Therefore, it is possible to provide a tabletop 1 with excellent durability and strength with a simple configuration.

[0026] The type of synthetic resin for the synthetic resin film 32 is not particularly limited as long as it is a synthetic resin film that can be welded. In this embodiment, the synthetic resin film 32 is a synthetic resin film that can be heat welded. Heat welding is a method of welding a heated object (synthetic resin film 32) to a welding target (core material 31) by applying heat from the outside to the heated object. Heat welding is suitable for welding a large area firmly in a short time. Therefore, the synthetic resin film 32 having a large area can be welded firmly in a short time to the core material 31 having a large area to form the top plate 1 (for example, a rectangular top plate with a long side of 1800 mm and a short side of 900 mm). This can shorten the manufacturing time of the top plate 1 in which the first decorative plate 21 and the second decorative plate 22 are not easily peeled off from the core material 31. For example, a PET (polyethylene terephthalate) film can be used as a synthetic resin film that can be heat welded. The type of the synthetic resin film 32 is not limited to a synthetic resin that can be heat welded. The synthetic resin film 32 may be welded by, for example, high-frequency welding or ultrasonic welding, in which the object to be heated (the synthetic resin film 32) is heated from the inside by high-frequency waves or ultrasonic waves.

[0027] The welding of the synthetic resin film 32 to the core material 31 includes the concept of melting (or softening) the synthetic resin film 32 and welding it, and the concept of melting (or softening) the synthetic resin film 32 and the core material 31. When melting (or softening) and welding the synthetic resin film 32 and the core material 31, the area of ​​the core material 31 near the interface with the synthetic resin film 32 is melted (or softened).

[0028] The thickness of the synthetic resin film 32 is not particularly limited as long as the synthetic resin film 32 can be welded to the core material 31. In this embodiment, the thickness of the synthetic resin film 32 is, for example, 0.01 to 1.0 mm, and preferably 0.03 to 0.3 mm.

[0029] In this embodiment, the first decorative board 21 and the second decorative board 22 are bonded to the synthetic resin film 32 via an adhesive (not shown) (see FIG. 2, FIG. 5 to FIG. 7). The type of adhesive is not particularly limited as long as it can firmly bond the first decorative board 21 and the second decorative board 22 to the synthetic resin film 32. In this embodiment, the first decorative board 21 and the second decorative board 22 are bonded to the synthetic resin film 32 via a rubber-based adhesive. The rubber-based adhesive requires a short time to harden and has a large bonding strength. Therefore, it is possible to provide a tabletop 1 in which the first decorative board 21 and the second decorative board 22 are less likely to peel off from the core material 31, and the time required to manufacture the tabletop 1 can be shortened. The type of adhesive is not limited to a rubber-based adhesive, and may be, for example, a chemical reaction adhesive, a hot melt adhesive, or a solvent adhesive.

[0030] In this embodiment, the tabletop 1 further includes wooden pieces 4 for screwing (hereinafter also referred to as screw-fastened wooden pieces 4; see Figs. 2 and 6) provided at the four corners of the core layer 3, and a frame-shaped member 5 made of wooden pieces. The screw-fastened wooden pieces 4 are members for screwing the legs L to the tabletop 1 (see Fig. 2). Since the core 31 made of foamed synthetic resin cannot be screwed with screws S, the screw-fastened wooden pieces 4 are provided as members into which the screws S can be screwed. By providing the screw-fastened wooden pieces 4 at the four corners of the core layer 3, the legs L and the like can be screwed to the screw-fastened wooden pieces 4. Therefore, the legs L and the like can be screwed to the tabletop 1 easily and reliably. Furthermore, by limiting the positions at which the screw-fastened wooden pieces 4 are provided to the minimum necessary (the four corners of the core layer 3), the weight of the entire tabletop 1 can be reduced. In addition, by using foamed synthetic resin, which is easy to process and inexpensive, as the material for the core 31, a tabletop 1 that is lightweight, low-cost, and easy to manufacture can be provided.

[0031] The frame-shaped member 5 (see Figs. 1 to 4, 6 and 7) is a member for protecting the core layer 3. Specifically, the frame-shaped member 5 is a member for protecting the end faces 33 (see Fig. 7) of the core layer 3 in the directions D2 and D3. The frame-shaped member 5 is also a member for hiding the end faces 33 (see Fig. 7) of the core layer 3 in the directions D2 and D3. The frame-shaped member 5 is also a member for hiding the end faces 41 (see Fig. 6) of the screw-fastened wooden pieces 4 in the directions D2 and D3. The frame-shaped member 5 protects the end faces 33 of the core layer 3, thereby preventing the end faces 33 of the core layer 3 from being scratched or dented due to exposure to the outside. The frame-shaped member 5 protects the end faces 33 of the core layer 3, thereby making it difficult for external forces to be applied that would peel off the first decorative board 21 and the second decorative board 22. Furthermore, since the frame-shaped member 5 hides the end face 33 of the core material layer 3 and the end face 41 of the screw-fixed wood piece 4, the tabletop 1 has a more aesthetically pleasing appearance than a structure in which the end face 33 of the core material layer 3 and the end face 41 of the screw-fixed wood piece 4 are exposed to the outside.

[0032] In this embodiment, the frame member 5 is provided in a rectangular frame shape on the outer periphery of the laminate LA, which is formed in a rectangular shape by the core layer 3 and the screw-fastened wooden pieces 4. In this embodiment, the frame member 5 (see FIG. 3) includes a first side member 53 provided at one end and the other end of the laminate LA in the direction D2, and a second side member 54 provided at one end and the other end of the laminate LA in the direction D3. The first side member 53 is provided along the short side of the laminate LA (one end and the other end of the laminate LA in the direction D2). The second side member 54 is provided along the long side of the laminate LA (one end and the other end of the laminate LA in the direction D3). The first side member 53 and the second side member 54 extend in a rod shape. The first side member 53 and the second side member 54 are connected to each other at their ends. The method of connecting the first side member 53 and the second side member 54 is not particularly limited. In this embodiment, the tabletop 1 has a connecting portion (not shown) for connecting the first side member 53 and the second side member 54. The connecting portion has, for example, a dowel (a cylindrical small piece, not shown) that connects the first side member 53 and the second side member 54. The connecting portion also has a dowel hole formed in the first side member 53 and a dowel hole formed in the second side member 54. By inserting the dowel into the dowel hole formed in the first side member 53 and the dowel hole formed in the second side member 54, the first side member 53 and the second side member 54 are connected to each other at a right angle (see FIG. 3).

[0033] In this embodiment, the first decorative board 21 (see Figs. 3, 4, 6 and 7) has an outer periphery 211 that is larger than the outer periphery 34 of the core material layer 3 (see Figs. 3, 4, 6 and 7) and smaller than the outer periphery 56 of the frame-shaped member 5 (see Figs. 3, 4, 6 and 7). The second decorative board 22 (see Figs. 6 and 7) has an outer periphery 221 that is larger than the outer periphery 34 of the core material layer 3 (see Figs. 3, 4, 6 and 7) and smaller than the outer periphery 56 of the frame-shaped member 5 (see Figs. 3, 4, 6 and 7). The frame-shaped member 5 has a top surface side cutout 51 (see Figs. 3, 4, 6 and 7) into which the peripheral portion of the first decorative board 21 is fitted, in a region on the inner periphery side of the frame-shaped member 5 among the portions that constitute the top surface (top surface of the frame-shaped member 5). In the example shown in FIG. 3 and FIG. 4, the top surface side cutout 51 is provided along the entire inner circumference of the frame-shaped member 5. The depth of the top surface side cutout 51 is approximately the same as the thickness of the first decorative board 21. The shape and size of the outer circumference of the top surface side cutout 51 are approximately the same as the shape and size of the outer circumference of the first decorative board 21. The peripheral portion of the first decorative board 21 is fitted into the top surface side cutout 51 of the frame-shaped member 5 (see FIG. 4, FIG. 6, and FIG. 7). In this embodiment, the peripheral portion of the first decorative board 21 is bonded to the top surface side cutout 51 via an adhesive. The frame-shaped member 5 also has a lower surface side cutout 52 into which the peripheral portion of the second decorative board 22 is fitted, in the region on the inner circumference side of the frame-shaped member 5 among the parts constituting the lower surface (see FIG. 6 and FIG. 7). In the example shown in Figures 6 and 7, the lower surface side cutout 52 is provided along the entire inner circumference of the frame-shaped member 5. The depth of the lower surface side cutout 52 is approximately the same as the thickness of the second decorative board 22. The shape and size of the outer periphery of the lower surface side cutout 52 are approximately the same as the shape and size of the outer periphery of the second decorative board 22. The peripheral portion of the second decorative board 22 is fitted into the lower surface side cutout 52 of the frame-shaped member 5 (see Figures 6 and 7). In this embodiment, the peripheral portion of the second decorative board 22 is adhered to the lower surface side cutout 52 via an adhesive.

[0034] The peripheral portion of the first decorative plate 22 is fitted into the top cutout 51 (located in the top side and inner circumferential region of the frame member 5) of the frame member 5, and the peripheral portion of the second decorative plate 22 is fitted into the bottom cutout 52 (located in the bottom side and inner circumferential region of the frame member 5) of the frame member 5, so that the outer peripheral surface (end surface) of the first decorative plate 21 is accommodated in the top cutout 51 of the frame member 5, and the outer peripheral surface (end surface) of the second decorative plate 22 is accommodated in the bottom cutout 52 of the frame member 5. This makes it possible to make the outer peripheral surface (end surface) of the first decorative plate 21 and the outer peripheral surface (end surface) of the second decorative plate 22 invisible from the outside. Therefore, compared to a structure in which the outer peripheral surface of the first decorative plate 21 and the outer peripheral surface of the second decorative plate 22 are exposed, it is possible to make the top plate 1 more aesthetically pleasing.

[0035] In this embodiment, the top plate 1 includes a connecting portion 55 extending from the inner periphery of the frame member 5 toward the core material 31 (see FIG. 7). The frame member 5 is connected to the outer periphery of the core material 31 by inserting the connecting portion 55 into the outer periphery of the core material 31. In this embodiment, the connecting portion 55 has a shape that allows it to be easily inserted into the outer periphery of the core material 31. Specifically, the connecting portion 55 is formed in a plate shape. In this case, the connecting portion 55 has a thickness that allows it to be easily inserted into the outer periphery of the core material 31. The connecting portion 55 has a thickness of, for example, about 0.5 to 3 mm, and preferably about 1 to 2 mm. The connecting portion 55 is provided on each of the first side member 53 and the second side member 54. The connecting portion 55 provided on the first side member 53 extends along the longitudinal direction of the first side member 53. The connecting portion 55 provided on the second side member 54 extends along the longitudinal direction of the second side member 54. The tip of the connecting portion 55 in the protruding direction is sharp (see FIG. 7). This further increases the ease of inserting the connecting portion 55 into the outer periphery of the core material 31. The material of the connecting portion 55 is not particularly limited as long as it can be inserted into the outer periphery of the core material 31. In this embodiment, the connecting portion 55 is made of wood from the viewpoint of weight reduction. The material of the connecting portion 55 is not limited to wood, and may be hard synthetic resin or the like. The method of connecting the frame-shaped member 5 to the core material 31 is not limited to the method using the connecting portion 55. For example, instead of the method using the connecting portion 55, the frame-shaped member 5 may be connected to the core material 31 via an adhesive. The frame-shaped member 5 may be connected to the core material 31 by using the connecting portion 55 and an adhesive in combination.

[0036] The connecting portion 55 is inserted into the outer periphery of the foamed synthetic resin core material 31, so that the frame-shaped member 5 is connected to the outer periphery of the core material 31. This allows the wooden frame-shaped member 5 to be connected to the foamed synthetic resin core material 31 with a simple structure. In addition, unlike the case where the frame-shaped member 5 is connected to the outer periphery of the core material 31 using an adhesive, no time is required for the adhesive to harden. Therefore, the manufacturing time of the tabletop 1 can be shortened compared to the case where the frame-shaped member 5 is connected to the core material 31 using an adhesive. In addition, the frame-shaped member 5 can be connected to the core material 31 more firmly than the case where the frame-shaped member 5 is connected to the core material 31 using an adhesive. When the connecting portion 55 and an adhesive are used in combination, the strength of the connection can be increased more than when either the connecting portion 55 or the adhesive is used alone.

[0037] Next, an example of a manufacturing method for the tabletop 1 according to this embodiment will be described. First, a plate-shaped core material 31 made of foamed synthetic resin is produced. The core material 31 is a plate-shaped member made of, for example, expanded polystyrene (expanded polystyrene). The core material 31 is produced, for example, by extrusion molding using the bead method. The expansion ratio in the bead method is not particularly limited, but can be, for example, 20 to 40 times, and preferably about 30 times.

[0038] Next, synthetic resin films 32 are welded to both sides of the plate-shaped core material 31. The synthetic resin film 32 is, for example, a PET film. The synthetic resin film 32 is welded, for example, by thermocompression bonding the synthetic resin film 32 to both sides of the core material 31. In this way, the core material layer 3 is formed. Next, the core material layer 3 is cut, for example, into a rectangular shape according to the size of the top plate 1. The four corners of the core material layer 3 cut into a rectangular shape are cut.

[0039] Next, the screw-fastened wooden pieces 4 are attached to the cut four corners of the core material layer 3. The screw-fastened wooden pieces 4 are attached to the cut four corners of the core material layer 3, for example, via an adhesive. In this way, a rectangular laminate LA is produced.

[0040] Next, the frame member 5 is attached to the outer periphery of the laminate LA. The frame member 5 can be formed by combining a first side member 53 and a second side member 54. The first side member 53 and the second side member 54 are each provided with a connecting portion 55. In the process of attaching the frame member 5, for example, the first side member 53 is attached to the long side (side along the direction D2) of the laminate LA, and the second side member 54 is attached to the short side (side along the direction D3) of the laminate LA. In addition, the connecting portion 55 provided on the first side member 53 is inserted into the core material 31 of the laminate LA, and the connecting portion 55 provided on the second side member 54 is inserted into the core material 31 of the laminate LA. In addition, the first side member 53 and the second side member 54 are connected to each other by a connecting portion (not shown). This connection can be achieved, for example, by inserting dowels into dowel holes formed in the first side member 53 and the second side member 54.

[0041] Next, the first decorative plate 21 and the second decorative plate 22 are attached to the synthetic resin film 32 on the top surface side and the bottom surface side of the laminate LA, respectively. Specifically, the first decorative plate 21 and the second decorative plate 22 are attached to the synthetic resin film 32 on the top surface side and the bottom surface side, respectively, via an adhesive. In addition, the peripheral portion of the first decorative plate 21 is fitted into the top surface side cutout portion 51 of the frame-shaped member 5. In addition, the peripheral portion of the second decorative plate 22 is fitted into the bottom surface side cutout portion 52 of the frame-shaped member 5. In this way, the top plate 1 is produced.

[0042] After the tabletop 1 is made, the legs L are screwed to the screw-fastened wooden pieces 4 of the tabletop 1, whereby the desk T can be made.

[0043] In addition, examples of the top plate 1 are not limited to those shown in Figs. 1 to 7. For example, the thickness of the frame-shaped member 5 may be the same as the thickness of the core material layer 3 (see Fig. 8). In this case, the frame-shaped member 5 does not have the above-mentioned face-side notch 51 and the bottom-side notch 52. Therefore, in a state in which the first decorative board 21 and the second decorative board 22 are attached to the core material layer 3 and the frame-shaped member 5, the outer periphery 211 of the first decorative board and the outer periphery 221 of the second decorative board are exposed. The peripheral portion of the first decorative board 21 is bonded to the top surface of the frame-shaped member 5 via an adhesive. The peripheral portion of the second decorative board 22 is bonded to the bottom surface of the frame-shaped member 5 via an adhesive. However, since the frame-shaped member 5 does not require the face-side notch 51 and the bottom-side notch 52, the manufacturing process of the top plate 1 can be reduced.

[0044] In the example shown in FIG. 8, the screw-fastening wooden pieces 4 are provided at the four corners of the core layer 3, but the present invention is not limited thereto. For example, the screw-fastening wooden pieces 4 may be provided along the short sides of the core layer 3. Specifically, the screw-fastening wooden pieces 4 may be provided so as to extend along the entire short sides of the core layer 3. The screw-fastening wooden pieces 4 may also be provided in the center of the core layer 3 in the directions D2 and D3. In this case, for example, a handle (not shown) is attached to the screw-fastening wooden pieces 4. This allows the handle to be provided in the center of the core layer 3 in the directions D2 and D3. By providing the handle in such a position, the top board 1 can be easily carried and the orientation of the top board 1 can be easily changed.

[0045] Furthermore, the tabletop 1 does not necessarily have to include the screw-fastened wooden pieces 4 (see Figs. 9 to 11). If the tabletop 1 does not include the screw-fastened wooden pieces 4, the tabletop 1 may include, for example, attachment members C as shown in Figs. 10 and 11 instead of the screw-fastened wooden pieces 4 (see, for example, JP 2017-74264 A). The legs L can be attached to the tabletop 1 via the attachment members C.

[0046] In this embodiment, the mounting member C includes a plate C1 that is attached to the second decorative plate 22 of the top plate 1 by adhesion or the like, and a cylindrical connected portion C2 that is provided on the plate C1 and protrudes and opens on the opposite side to the plate C1. Here, the connected portion C2 may be provided integrally with the plate C1, or may be provided separately. In this embodiment, the connected portion C2 is attached to the plate C1 via a screw S1 (see Figs. 10 and 11). Specifically, the connected portion C2 includes a cylindrical main body portion C21 and a flange portion C22 provided on one end (the end on the plate C1 side) of the main body portion C21. The flange portion C22 has a screw hole (not shown) through which the leg of the screw S1 can be inserted. The material of the plate C1 is not particularly limited as long as it can be attached to the second decorative plate 22 of the top plate 1 by adhesion or the like, but it can be made of, for example, metal, synthetic resin, wood, or the like. The material of the connected part C2 is not particularly limited as long as it can connect the leg L and the plate C1, and it can be made of, for example, metal, synthetic resin, etc. In this embodiment, the mounting member C is configured such that a female thread is formed in the connected part C2 (main body part C21 in the example shown in Figs. 10 and 11) and a male thread provided at one end of the leg L is screwed into the female thread of the connected part C2, thereby mounting the leg L to the mounting member C.

[0047] Moreover, the top plate 1 may be provided with an edge band 6 or a strip (not shown) instead of the frame-shaped member 5 (see Figs. 9 to 11). The edge band 6 or strip is provided so as to cover the end face 33 of the core material layer 3 (see Figs. 10 and 11). The edge band 6 or strip is a strip-shaped member (for example, a strip-shaped decorative material) attached to the outer periphery 34 of the core material layer 3. More specifically, the edge band 6 or strip is a strip-shaped member attached to the outer periphery of the core material layer 3, the first decorative plate 21, and the second decorative plate 22 (see Fig. 11). That is, the top plate 1 may be provided with an edge band 6 or strip provided along the outer periphery 34 of the laminate 3 of the first decorative plate 21, the second decorative plate 22, and the core material layer 3. The edge band 6 or strip has a strip width equal to the sum of the thicknesses of the core material layer 3, the first decorative plate 21, and the second decorative plate 22. In this embodiment, the edge bands 6 or strips are provided on each of the four sides of the rectangular top plate 1 shown in FIG. 9 (for example, two edge bands 61 for the long sides and two edge bands 62 for the short sides) to protect the outer periphery 34 of the core material layer 3. The edge bands 6 or strips also protect the outer peripheries of the first decorative board 21 and the second decorative board 22. The material of the edge bands 6 is not particularly limited, but may be made of, for example, a synthetic resin such as ABS resin, a wood sheet, or the like. The material of the strips is not particularly limited, but may be made of, for example, ABS resin, a synthetic resin such as polypropylene, a wood board (for example, a veneer or a veneer), or the like.

[0048] Since the edge band 6 or the strip is thin and lightweight, it can be connected to the core layer 3 only with an adhesive, without using the connecting portion 55. In detail, since the edge band 6 or the strip is thin and lightweight, even if an external force acts on the edge band 6 or the strip in a state where it is bonded to the core layer 3, the moment of force due to the external force is small. Therefore, the edge band 6 or the strip can be fixed to the core layer 3 with an adhesive. In this embodiment, the edge band 6 or the strip is fixed to the outer periphery of the core layer 3, the first decorative plate 21, and the second decorative plate 22 with an adhesive. When the edge band 6 or the strip is connected to the core layer 3 with an adhesive, it is not necessary to provide a reinforcing member (such as a piece of wood) for attaching a fixing member such as a screw to the outer periphery of the tabletop 1. Therefore, the tabletop 1 can be made lighter. In addition, since the configuration of the tabletop 1 is very simple, the tabletop 1 can be manufactured at a very low cost.

[0049] The adhesive for bonding the core material layer 3 and the like to the edge band 6 or the strip is not particularly limited, and may be, for example, a hot melt adhesive or a solvent adhesive. The bonding process using an adhesive such as a hot melt adhesive or a solvent adhesive may be performed, for example, by using an edge bander (edge ​​material bonding machine). In this embodiment, the edge bander (not shown) is configured to apply the adhesive to the bonding target surface (the end surfaces of the core material layer 3, the first decorative sheet 21, and the second decorative sheet 22) and bond the edge band 6 or the strip to the bonding target surface via the adhesive. The edge bander can bond the edge band 6 or the strip to the bonding target surface by pressing the edge band 6 or the strip against the bonding target surface to which the adhesive has been applied using a pressure roller or the like.

[0050] Specifically, the edge bander may be configured to heat the adhesive through the edge band 6 or the strip when pressing the edge band 6 or the strip against the surface to be bonded to which the adhesive has been applied. When a solvent-based adhesive is used, heating the adhesive through the edge band 6 or the strip promotes the volatilization of the solvent contained in the adhesive, so that the adhesive can be cured quickly and the bonding process can be completed quickly. The edge bander may also be configured to apply the adhesive by spraying it from a spray gun. When a solvent-based adhesive is used, applying the adhesive by spraying promotes the volatilization of the solvent contained in the adhesive, so that the adhesive can be cured quickly.

[0051] Furthermore, when a hot melt adhesive or a solvent adhesive is used, the edge bander may be configured to continuously carry out the process from application of the adhesive to the bonding surface to curing of the adhesive in a short period of time (specifically, a period of time such that the end face of the core layer 3 is not substantially melted by the adhesive). By continuously applying and curing the adhesive in a short period of time such that the core layer 3 is not substantially melted, it is possible to prevent the core layer 3 from being dissolved by the adhesive.

[0052] In particular, when a solvent-based adhesive is used, the edge bander may be configured to continuously carry out the process from applying the adhesive to the surface to be bonded to heating the adhesive to bond the surface in a short period of time (specifically, for a period of time such that the end face of the core layer 3 is not substantially melted by the adhesive). By continuously applying, heating, and curing the adhesive in a short period of time such that the core layer 3 is not substantially melted, it is possible to prevent the core layer 3 from being dissolved by the adhesive.

[0053] Moreover, the top plate 1 may be provided with a coating layer (not shown) instead of the frame-shaped member 5 or the edge band 6. The coating layer is provided so as to cover the end face 33 of the core material layer 3. The coating layer is provided so as to cover the outer periphery 34 of the core material layer 3. The coating layer is also provided so as to cover the end faces of the first decorative material 21 and the second decorative board 22. The coating layer is provided so as to cover the outer periphery of the first decorative material 21 and the second decorative board 22. The coating layer can protect the end face 33 of the core material layer 3 and the end faces of the first decorative board 21 and the second decorative board 22. The material of the coating layer is not particularly limited as long as it can protect the end face 33 of the core material layer 3 and the end faces of the first decorative board 21 and the second decorative board 22. In this embodiment, the coating layer can be formed, for example, by applying paint to the target surface. The type of paint is not particularly limited as long as it can protect the end surface 33 of the core material layer 3 and the end surfaces of the first decorative board 21 and the second decorative board 22. In this embodiment, for example, urethane paint, polyester paint, lacquer paint, or the like can be used. In order to improve the adhesion of the paint to the end surface 33 of the core material layer 3, the end surface 33 of the core material layer 3 may be undercoated with a primer (primer treatment). In addition, in order to improve the adhesion of the paint to the end surfaces of the first decorative material 21 and the second decorative board 22, the end surfaces of the first decorative material 21 and the second decorative board 22 may be undercoated with a primer (primer treatment).

[0054] In the examples shown in Fig. 2 and Fig. 5 to Fig. 7, the outer periphery of the tabletop 1 is linear (a straight line perpendicular to the top and bottom surfaces of the tabletop 1) in a cross section of the tabletop 1 cut in the direction D1, but is not limited thereto. For example, the outer periphery of the tabletop 1 may be formed to have a substantially arc-shaped cross section that is convex outward in a cross section of the tabletop 1 cut in the direction D1. By having the outer periphery of the tabletop 1 have a substantially arc-shaped cross section, the worker's hands are less likely to get hurt when carrying the tabletop 1. Also, when a coating layer is provided instead of the frame-shaped member 5 or the edge band 6, the outer periphery of the tabletop 1 can be formed to have a similar cross-sectional shape (a substantially arc-shaped cross section that is convex outward).

[0055] As described above, according to the tabletop 1 of this embodiment, the synthetic resin film 32 is firmly integrated on both sides of the core material 31 by welding the synthetic resin film 32 to the core material 31. When an external force in the peeling direction is applied to the first decorative board 21 or the second decorative board 22 bonded to the synthetic resin film 32 integrated with the core material 32, the synthetic resin film 32 strongly resists the peeling force (external force in the peeling direction) of the first decorative board 21 or the second decorative board 22 against the core material 32. Therefore, peeling of the first decorative board 21 and the second decorative board 22 from the core material 32 can be prevented. This makes it possible to provide a tabletop 1 in which the first decorative board 21 and the second decorative board 22 are less likely to peel off from the core material 31 and which has improved strength. Therefore, a tabletop 1 with excellent durability and strength can be provided with a simple configuration. [Explanation of symbols]

[0056] 1 Lightweight desk top 21 First Veneer 211 Outer periphery of first decorative panel 22 Second Veneer 221 Outer periphery of second decorative panel 3 Core layer 31 Core material 32 Synthetic resin film 33 End face of core layer 34 Outer periphery of core layer 4 Pieces of wood for screwing 41 End face of a piece of wood to be screwed 5 Frame-shaped member 51 Top cutout 52 Bottom side notch 53 First side member 54 Second side member 55 Connecting part 56 Outer periphery of frame-shaped member 6 Edge Band 61 Edge band for long side 62 Edge band for short side C Mounting material C1 Plate C2 Connected part C21 Main unit C22 flange D1 Desk height (vertical direction) D2 Longitudinal direction of the desk (longitudinal direction of the tabletop) D3 Desk width (width of table top) L leg LA laminate M Leg attachment part T desk

Claims

1. A lightweight desk top panel including a first decorative panel forming a top surface of the desk top panel, a second decorative panel forming a lower surface of the desk top panel, and a core material layer provided between the first decorative panel and the second decorative panel, The core layer is A plate-shaped core material made of foamed synthetic resin; and a synthetic resin film welded to each of both sides of the core material. Lightweight tabletop.

2. The lightweight desk top according to claim 1 , wherein the first decorative plate and the second decorative plate are decorative plates containing a hard synthetic resin.

3. The lightweight desk top is The lightweight desk top of claim 1, further comprising an edge band, strip or frame-shaped member arranged along the outer periphery of the laminate of the first decorative panel, the second decorative panel and the core material layer, the edge band, strip or frame-shaped member covering an end face of the core material layer.

4. The lightweight desk top is The lightweight desk top according to claim 1, further comprising a piece of wood for screwing provided on the core layer.

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