Table for Kotatsu

Abstract

To provide a table for kotatsu, a table which can suppress shift and play of a top board and which can likely to inexpensively maintain a cost of manufacture.SOLUTION: A table for kotatsu according to one aspect of the present invention is equipped with: a top board supporting part with a heater loaded; a plurality of leg parts for holding the top board supporting part at a prescribed height; and a top board which is placed on the top board supporting part. The top board is provided with a top board body, a first coating layer applied on a rear face of the top board body, and a second coating layer applied on a surface of the top board body. The first coating layer contains fine grains for forming a rough surface having heat resistance for heater heat and forms a rough surface on the rear face of the top board body.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a kotatsu table.

Background Art

[0002] Conventionally, a kotatsu table having a plurality of legs, a top plate support portion for supporting a top plate, and a top plate placed on the top plate support portion is known. When the kotatsu table is used as a heating appliance, a kotatsu futon is placed on the top plate support portion, and the top plate is placed on the kotatsu futon. When the kotatsu table is used as a heating appliance and a force is applied to the top plate by a user or the like, there is a problem that the top plate slips on the kotatsu futon and is displaced. In contrast, a kotatsu table that suppresses the displacement of the top plate has been proposed.

[0003] For example, Patent Document 1 discloses a kotatsu having a frame, legs for supporting the frame, a heater, a kotatsu body having a fitting recess on the upper surface side of the frame, and a top plate having a fitting convex portion that cooperates with the fitting recess on the lower surface side to sandwich a kotatsu cover so as to bend it up or down, or up and down.

[0004] Further, Patent Document 2 discloses a top plate anti-slip device for furniture kotatsu or the like, in which protrusions are provided on a sheet-like object made of a non-slip material such as synthetic rubber, and this is laid between the kotatsu futon and the top plate to stabilize the top plate.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the kotatsu described in Patent Document 1, a gap may occur between the fitting concave portion and the fitting convex portion and the kotatsu futon, or rattling may occur on the top plate due to the shape of the kotatsu futon being deformed by being pressed by the fitting concave portion and the fitting convex portion. Even in the kotatsu table using the top plate anti-slip described in Patent Document 2, rattling may occur on the top plate due to wear or detachment of some protrusions. Further, when such a special structure is adopted, the manufacturing cost tends to be unnecessarily high.

[0007] An aspect of the present invention aims to provide a kotatsu table that can suppress displacement and rattling of the top plate and is also easy to maintain at a low manufacturing cost.

Means for Solving the Problems

[0008] The kotatsu table according to an aspect of the present invention includes a top plate support portion equipped with a heater, a plurality of legs that support the top plate support portion at a predetermined height, and a top plate placed on the top plate support portion. The top plate has a top plate main body, a first coating layer applied to the back surface of the top plate main body, and a second coating layer applied to the front surface of the top plate main body. The first coating layer contains fine particles for forming a rough surface having heat resistance against the heat of the heater and forms a rough surface on the back surface of the top plate main body , for suppressing the displacement of the top plate with respect to the kotatsu futon to form a rough surface , and the second coating layer does not contain the fine particles for forming the rough surface included in the first coating layer and maintains the surface of the top plate as a smooth surface .

Effects of the Invention

[0009] According to the kotatsu table according to an aspect of the present invention, displacement and rattling of the top plate can be suppressed, and the manufacturing cost can also be easily maintained at a low level.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In order to facilitate understanding of the description, the same reference numerals are given to the same components in each drawing, and redundant descriptions may be omitted. In this specification, a three-dimensional orthogonal coordinate system in three axial directions (X-axis direction, Y-axis direction, Z-axis direction) may be used for the description. In that case, the direction perpendicular to the top plate is defined as the Z-axis direction, and on the plane perpendicular to the Z-axis, one of the two mutually perpendicular directions is defined as the X-axis direction, and the other is defined as the Y-axis direction. Also, the +Z-axis direction is upward and the -Z-axis direction is downward.

[0012] FIG. 1 is a perspective view of a kotatsu table according to an embodiment, FIG. 2 is an exploded perspective view of the kotatsu table according to an embodiment as viewed from below, FIG. 3 is an exploded perspective view of the kotatsu table according to an embodiment as viewed from above, and FIG. 4 is a cross-sectional view of the top plate orthogonal to the Y-axis. As shown in FIGS. 1 to 3, the kotatsu table 1 includes a top plate support portion 2 equipped with a heater 6, a plurality of legs 3 that support the top plate support portion 2 at a predetermined height, and a top plate 4 placed on the top plate support portion 2. Further, as shown in FIGS. 2 and 4, the top plate 4 has a top plate body 40, a first coating layer 41 applied to the back surface (lower surface) S1 of the top plate body 40, and a second coating layer 42 applied to the front surface (upper surface, or the surface of the top plate body 40 opposite to the side of the top plate support portion 2). The first coating layer 41 contains fine particles for forming a rough surface that have heat resistance against the heat of the heater 6 and forms a rough surface on the back surface of the top plate body 40. Here, the heat resistance against the heat of the heater 6 means heat resistance that does not deform due to the heat of the heater 6. The first coating layer 41 and the second coating layer 42 are formed by coating with a coating agent. When the kotatsu table 1 is used as a heating appliance, the top plate 4 is placed on the top plate support portion 2 via an arbitrary kotatsu futon. When the kotatsu table 1 is used as a table (when not used as a heating appliance), the top plate 4 is placed directly on the top plate support portion 2.

[0013] The first coating layer 41 containing fine particles for forming a rough surface and having heat resistance, which is applied to the lower surface S1 of the top plate body 40, forms a rough surface on the lower surface S1 of the top plate body 40. As a result, fine irregularities due to the fine particles for forming a rough surface are formed on the lower surface S3 of the top plate 4, and the surface roughness of the lower surface S3 of the top plate 4 can be increased as compared with the case where the first coating layer 41 is not provided. Therefore, when using the kotatsu table 1 as a heating appliance, when the top plate 4 is placed on the top plate support portion 2 via the kotatsu futon, the contact between the first coating layer 41 of the top plate 4 and the kotatsu futon can suppress the displacement of the top plate 4. Further, since the first coating layer 41 is provided along the shape of the lower surface S1 of the top plate body 40, the lower surface S3 of the top plate 4 and the kotatsu futon can be brought into close contact with each other, and rattling of the top plate 4 can be suppressed. Furthermore, for the kotatsu table 1, there is no need to newly provide a separate member on the lower surface S1 of the top plate body 40, and the manufacturing cost can be easily maintained at a low level.

[0014] In addition, the top plate 4 is coated with the first coating layer 41 and the second coating layer 42 on the front and back surfaces, more precisely, over the entire circumference of the top plate body 40, thereby preventing absorption of moisture from the outside and transpiration of moisture to the outside. In this embodiment, the top plate 4 is formed in a long shape with a long side length exceeding 1 m, and since it is heated by the heat generation of the heater 6 of the kotatsu, it may warp due to expansion and contraction caused by changes in the moisture content. However, the first coating layer 41 and the second coating layer 42 prevent and suppress the occurrence of such problems.

[0015] The top plate body 40 and the top plate support portion 2 are made of fiberboard. More specifically, they are formed by directly printing wood grains on MDF (Medium Density Fiberboard). Further, the legs 3 are made of appropriate wood. The coating methods of the first coating layer 41 and the second coating layer 42 can be realized by so-called UV coating or PU coating. In this embodiment, UV coating is adopted. Note that for the top plate body 40, a material that causes dimensional changes due to the heat generation of the heater 6 as described above, specifically a wooden material, is used, and it is also possible to adopt solid wood, glued laminated timber, laminated wood, etc. instead of the above MDF. Also, for the surface design treatment of the top plate 4, instead of the above direct printing, it is also possible to stick decorative materials such as decorative sheets on the MDF.

[0016] The top plate support portion 2 may be flat plate-shaped, frame-shaped, or lattice-shaped. The planar shape of the top plate support portion 2 is not particularly limited, and for example, it can be triangular, rectangular, circular, elliptical, etc. A heater 6 is provided on the lower surface S7 of the top plate support portion 2.

[0017] The top plate support portion 2 is flat plate-shaped, and it is preferable that the first coating layer 41 is provided on the entire surface of the surface of the top plate body 40 facing the top plate support portion 2. Thereby, when the top plate 4 is placed on the top plate support portion 2 via a kotatsu futon, the contact area between the first coating layer 41 of the top plate 4 and the kotatsu futon can be increased, and the top plate 4 and the kotatsu futon can be made to adhere more closely. Therefore, the kotatsu table 1 can more effectively suppress the displacement and rattling of the top plate 4.

[0018] When the top plate support portion 2 is flat, the top plate support portion 2 may have a pair of screw holes 23 provided diagonally. The screw 5 can be inserted into the screw hole 23 from the lower surface S7 side of the top plate support portion 2, and the screw 5 penetrates the screw hole 23. When using the kotatsu table 1 as a table, the top plate 4 is directly placed on the top plate support portion 2, the screw 5 is inserted into the screw hole 23 from the lower surface S7 side of the top plate support portion 2, and the screw 5 is screwed into the female screw hole 43 provided on the lower surface S3 of the top plate 4, whereby the top plate 4 can be fixed to the top plate support portion 2. When using the kotatsu table 1 as a heating appliance, the top plate support portion 2 and the top plate 4 can be separated by removing the screw 5 from the female screw hole 43 of the top plate 4, and a kotatsu futon can be installed between the top plate support portion 2 and the top plate 4.

[0019] When the planar shape of the top plate support portion 2 is a quadrilateral, the legs 3 are provided at the four corners of the lower surface S7 of the top plate support portion 2. The shape of the legs 3 is not particularly limited, and for example, they can be cylindrical or prismatic. The legs 3 may have a first leg portion 31 with one end connected to the lower surface S7 of the top plate support portion 2 and a second leg portion 32 with one end connected to the other end of the first leg portion 31. The first leg portion 31 and the second leg portion 32 are connected in the longitudinal axis direction of the legs 3. The second leg portion 32 is detachable from the first leg portion 31. According to this configuration, the height of the legs 3 can be changed. That is, according to this configuration, the height of the kotatsu table 1 can be changed. For example, when using the kotatsu table 1 while sitting on the floor, the height of the kotatsu table 1 can be lowered by removing the second leg portion 32 from the first leg portion 31, and when using the kotatsu table 1 while sitting on a chair, the height of the kotatsu table 1 can be increased by attaching the second leg portion 32 to the first leg portion 31. The second leg portion 32 can be detachable from the first leg portion 31 by a screw structure, for example.

[0020] The height of the kotatsu table 1 can be, for example, 60 cm or more and 70 cm or less when the second leg 32 is attached to the first leg 31, and can be, for example, 35 cm or more and 45 cm or less when the second leg 32 is removed from the first leg 31. Here, the height of the kotatsu table 1 means the distance from the lower end of the leg 3 to the upper surface S4 of the top plate 4. Note that the leg 3 is not limited to a configuration having the first leg 31 and the second leg 32, and may be, for example, vertically extendable and contractible. In this case, the maximum value of the height of the kotatsu table 1 can be, for example, 60 cm or more and 70 cm or less, and the minimum value can be, for example, 35 cm or more and 45 cm or less.

[0021] Even when the height of the kotatsu table 1 is relatively high (for example, 60 cm or more and 70 cm or less) with the top plate 4 placed on the top plate support portion 2 via the kotatsu futon, the top plate 4 can suppress the displacement and rattling of the top plate 4 by having the first coating layer 41.

[0022] The top plate body 40 is flat. The planar shape of the top plate body 40 is not particularly limited, and can be, for example, triangular, rectangular, circular, elliptical, etc. When the planar shape of the top plate body 40 is triangular or rectangular, the top plate body 40 may have rounded corners. The planar shape of the top plate body 40 can be the same as the planar shape of the top plate support portion 2 or a similar shape to the planar shape of the top plate support portion 2. When the planar shape of the top plate body 40 is a similar shape to the planar shape of the top plate support portion 2, in plan view, the periphery of the top plate body 40 is located outside the periphery of the top plate support portion 2.

[0023] The top plate 4 may have a frame portion (not shown) that covers the side surface of the top plate body 40, the peripheral portion of the upper surface S4, and the peripheral portion of the lower surface S3. The top plate 4 may have a pair of female screw holes 43 provided diagonally on the lower surface S3. The female screw holes 43 do not open to the upper surface S4 side of the top plate 4. As described above, the screw 5 is screwed into the female screw holes 43.

[0024] In a plan view, when the periphery of the top plate body 40 is located outside the periphery of the top plate support portion 2, the first coating layer 41 may or may not be provided on the surface of the lower surface of the top plate body 40 that does not face the top plate support portion 2. That is, the first coating layer 41 may or may not be provided in a region of the lower surface of the top plate body 40 outside the projection region of the top plate support portion 2 in a plan view.

[0025] The arithmetic mean roughness (Ra) of the first coating layer 41 is preferably 4 μm or more and 100 μm or less, more preferably 6 μm or more and 100 μm or less, and even more preferably 8 μm or more and 100 μm or less. In this specification, the arithmetic mean roughness is based on JIS B 0601:2013 and can be measured using a surface roughness measuring instrument such as a stylus type, optical cutting type, or optical interference type.

[0026] When the arithmetic mean roughness of the first coating layer 41 is 4 μm or more and 100 μm or less, when the top plate 4 is placed on the top plate support portion 2 via the kotatsu futon, the fibers of the kotatsu futon are likely to catch on the first coating layer 41, and the kotatsu table 1 can more effectively suppress the displacement of the top plate 4. In addition, the kotatsu table 1 can suppress the displacement of the top plate 4 regardless of the type or fiber diameter of the fibers used for the kotatsu futon.

[0027] The average particle diameter of the fine particles for forming the rough surface contained in the first coating layer 41 is preferably 0.5 μm or more and 50 μm or less, more preferably 1 μm or more and 40 μm or less, and even more preferably 1.5 μm or more and 30 μm or less. In this embodiment, the average particle diameter is specifically in the range of 10 μm or more and 15 μm or less. In this specification, the average particle diameter of the fine particles for forming the rough surface used in the first coating layer 41 refers to the average particle diameter in the form in which the particles stably exist. For example, it may be either the average particle diameter of independent primary particles or the average particle diameter of secondary particles (aggregated particles) formed by firmly aggregating primary particles. The average particle diameter can be measured, for example, by a laser diffraction / scattering type device or a Coulter counter type device. When the average particle diameter of the fine particles for forming the rough surface is 0.5 μm or more and 50 μm or less, when the top plate 4 is placed on the top plate support portion 2 via the kotatsu futon, the fibers of the kotatsu futon are likely to catch on the first coating layer 41, and the kotatsu table 1 can more effectively suppress the displacement of the top plate 4.

[0028] As the material constituting the fine particles for forming the rough surface, it is preferable that the melting point is 400 °C or higher and the hardness is relatively high. The fine particles for forming the rough surface may be ceramic powder. Specifically, examples of the material constituting the fine particles for forming the rough surface include silicon dioxide, magnesium oxide, aluminum oxide, silicon carbide, silicon nitride, zirconium dioxide, magnesium carbonate, calcium carbonate, magnesium hydroxide, and the like. Among these, the fine particles for forming the rough surface preferably consist of silicon dioxide. Since silicon dioxide has excellent heat resistance, relatively high hardness, and is colorless and transparent, when the fine particles for forming the rough surface consist of silicon dioxide, the first coating layer 41 can maintain fine unevenness even when receiving the heat or external force of the heater 6 while maintaining the appearance of the top plate body 40. Therefore, the kotatsu table 1 can more effectively suppress the displacement of the top plate 4 without damaging the appearance of the top plate 4. The first coating layer 41 may contain talcum powder in addition to the fine particles for forming the rough surface in order to enhance heat resistance and the like.

[0029] The first coating layer 41 is composed of a coating film containing a synthetic resin material. That is, the first coating layer 41 contains one or more synthetic resin materials. As the synthetic resin material, for example, one or more selected from polyurethane acrylate resin, epoxy acrylate resin, acrylate resin, polyurethane resin, polyester resin, etc. can be used. Among these, the synthetic resin material is preferably polyurethane acrylate resin and epoxy acrylate resin. Thereby, even when an external force is applied to the first coating layer 41 due to friction caused by the contact between the first coating layer 41 and the kotatsu futon, the self-weight of the top plate 4, objects placed on the top plate 4, etc., the fine particles for forming the rough surface in the first coating layer 41 can be suppressed from detaching.

[0030] The first coating layer 41 contains one or more synthetic resin materials, and the content of the fine particles for forming the rough surface is preferably 5% by mass or more and 60% by mass or less, more preferably 10% by mass or more and 50% by mass or less, and even more preferably 15% by mass or more and 40% by mass or less with respect to the total mass of the first coating layer 41. The first coating layer 41 contains one or more synthetic resin materials, and when the content of the fine particles for forming the rough surface is 10% by mass or more and 60% by mass or less with respect to the total mass of the first coating layer 41, the fine particles for forming the rough surface can be well dispersed in the synthetic resin material, so that unevenness due to the fine particles for forming the rough surface can be formed over the entire first coating layer 41. Therefore, the kotatsu table 1 can more effectively suppress the displacement of the top plate 4.

[0031] The thickness of the first coating layer 41 is preferably 16 μm or more and 400 μm or less, more preferably 30 μm or more and 400 μm or less, and even more preferably 50 μm or more and 400 μm or less. When the thickness of the first coating layer 41 is 16 μm or more and 400 μm or less, the first coating layer 41 has excellent durability and can maintain the suppression of the displacement of the top plate 4.

[0032] The second coating layer 42 contains the same synthetic resin material as the synthetic resin material contained in the first coating layer 41 and does not contain the fine particles for forming a rough surface contained in the first coating layer 41. Thereby, the upper surface S4 and the lower surface S3 of the top plate 4 can have similar durability, and the lower surface S3 of the top plate 4 can further have a function of suppressing the displacement of the top plate 4.

[0033] FIG. 5 is a cross-sectional view orthogonal to the Y-axis in the top plate support portion. As shown in FIGS. 3 and 5, the top plate support portion 2 preferably has a third coating layer 21 containing fine particles for forming a rough surface provided on a surface S6 facing the top plate 4 of the top plate support portion main body 20. Thereby, since the top plate support portion 2 has the third coating layer 21 containing fine particles for forming a rough surface provided on the surface S6 facing the top plate 4 of the top plate support portion main body 20, fine irregularities due to the fine particles for forming a rough surface are formed on the upper surface S8 of the top plate support portion 2, and the surface roughness of the upper surface S8 of the top plate support portion 2 can be increased as compared with the case where the third coating layer 21 is not provided. Therefore, when using the kotatsu table 1 as a heating appliance, when the top plate 4 is placed on the top plate support portion 2 via the kotatsu futon, the first coating layer 41 of the top plate 4 and the third coating layer 21 of the top plate support portion 2 come into contact with the kotatsu futon, so that it is possible to suppress the top plate 4 from sliding on the top plate support portion 2 together with the kotatsu futon. That is, the kotatsu table 1 can further suppress the displacement of the top plate 4. Further, since the first coating layer 41 is provided along the shape of the lower surface S1 of the top plate main body 40 and the third coating layer 21 is provided along the shape of the surface S6 facing the top plate 4 of the top plate support portion main body 20, each of the top plate 4 and the top plate support portion 2 can be brought into close contact with the kotatsu futon, and rattling of the top plate 4 can be further suppressed.

[0034] Specifically, it is preferable that the third coating layer 21 is provided on the surface of the top plate support portion main body 20 facing the first coating layer 41. That is, in plan view, it is preferable that the third coating layer 21 is provided in the projection area of the first coating layer 41 on the surface S6 facing the top plate 4 of the top plate support portion main body 20. Thereby, when using the kotatsu table 1 as a heating appliance, when the top plate 4 is placed on the top plate support portion 2 via the kotatsu futon, the first coating layer 41 of the top plate 4 and the third coating layer 21 of the top plate support portion 2 can sandwich the kotatsu futon, and further suppress the displacement of the top plate 4.

[0035] The arithmetic mean roughness (Ra) of the third coating layer 21 is preferably 4 μm or more and 100 μm or less, more preferably 6 μm or more and 100 μm or less, and even more preferably 8 μm or more and 100 μm or less. When the arithmetic mean roughness of the third coating layer 21 is 4 μm or more and 100 μm or less, when the top plate 4 is placed on the top plate support portion 2 via the kotatsu futon, the fibers of the kotatsu futon are likely to catch on the third coating layer 21, and the kotatsu table 1 can further suppress the displacement of the top plate 4. In addition, the kotatsu table 1 can suppress the displacement of the top plate 4 regardless of the type or fiber diameter of the fibers used for the kotatsu futon.

[0036] Further, the third coating layer 21 can have the same configuration as that of the first coating layer 41 described above. Thereby, the third coating layer 21 can exhibit the same effect as the first coating layer 41.

[0037] As shown in FIGS. 2 and 5, the top plate support portion 2 has a fourth coating layer 22 provided on a surface (lower surface) S5 on the side opposite to the top plate 4 side of the top plate support portion main body 20. The fourth coating layer 22 contains the same synthetic resin material as the synthetic resin material contained in the third coating layer 21 and does not contain the fine particles for forming a rough surface contained in the third coating layer 21. Thereby, the upper surface S8 and the lower surface S7 of the top plate support portion 2 can have similar durability, and the upper surface S8 of the top plate support portion 2 can further have a function of suppressing the displacement of the top plate 4 and the kotatsu futon. Note that the fourth coating layer 22 may contain the same synthetic resin material as the synthetic resin material contained in the first coating layer 41.

[0038] Next, an example of a method for manufacturing the kotatsu table 1 of the present embodiment will be described. The manufacturing method of the kotatsu table 1 of the present embodiment includes a step of preparing the top plate 4 and a step of attaching the leg portion 3 to the top plate support portion 2. The step of preparing the top plate 4 includes a step of forming a first coating layer 41 containing fine particles for forming a rough surface on the lower surface S1 of the top plate main body 40, and a step of forming a second coating layer 42 that does not contain the fine particles for forming a rough surface contained in the first coating layer 41 on a surface S2 on the side opposite to the top plate support portion 2 side of the top plate main body 40.

[0039] In the step of forming the first coating layer 41, the fine particles for forming a rough surface contained in the first coating layer 41 are the same as the fine particles for forming a rough surface in the kotatsu table 1 described above, and thus the description thereof is omitted.

[0040] Examples of the method for forming the first coating layer 41 and the second coating layer 42 include methods such as a gravure coating method, a dipping method, a spraying method, a brush coating method, a roller method, an electrostatic coating method, and an electrodeposition coating method.

[0041] Since the composition and thickness of the first coating layer 41 and the second coating layer 42 are the same as those of the first coating layer 41 and the second coating layer 42 in the kotatsu table 1 described above, the description thereof is omitted.

[0042] The second coating layer 42 contains the same synthetic resin material as the synthetic resin material contained in the first coating layer 41, and does not contain the fine particles for forming a rough surface contained in the first coating layer 41. Thus, according to the manufacturing method of the kotatsu table 1 of the present embodiment, the upper surface S4 and the lower surface S3 of the top plate 4 can have similar durability, and the lower surface S3 of the top plate 4 can further have a function of suppressing the displacement of the top plate 4.

[0043] In the step of forming the first coating layer 41, a plurality of first coating layers 41 are laminated and formed, and the coating amount of each of the plurality of first coating layers 41 may be larger as the layer is closer to the lower surface S1 of the top plate body 40. Further, it is preferable that the viscosity of each of the plurality of first coating layers 41 is larger as the layer is closer to the lower surface S1 of the top plate body 40.

Example

[0044] Specific examples will be given below for explanation, but the present invention is not limited to these examples.

[0045] The top plate 4 and the top plate support portion 2 of the kotatsu table 1 were produced and evaluated by the following method. Specific conditions will be described below.

[0046] <Example 1> (Production of top plate) A coating liquid A containing 15% by mass of silica (silicon dioxide) particles having an average particle diameter of 1 μm, 40% by mass of a polyurethane acrylate resin, 40% by mass of an epoxy acrylate resin, and 5% by mass of a photoinitiator was prepared. Further, a coating liquid B containing 48% by mass of a polyurethane acrylate resin, 48% by mass of an epoxy acrylate resin, and 4% by mass of a photoinitiator was prepared.

[0047] Coating liquid A was applied to one surface (surface S1) of a top plate body of 1200 mm × 750 mm × 17 mm at a coating amount of 32 g / m 2Applied at [specified condition], irradiated with ultraviolet rays using a UV lamp, and the applied coating liquid A was cured to form the first coating layer. On the first coating layer, coating liquid A was applied at a coating amount of 20 g / m 2 Applied at [specified condition], irradiated with ultraviolet rays using a UV lamp, and the applied coating liquid A was cured to form the second coating layer. On the second coating layer, coating liquid A was applied at a coating amount of 7 g / m 2 Applied at [specified condition], irradiated with ultraviolet rays using a UV lamp, and the applied coating liquid A was cured to form the third coating layer. Thus, a coating layer with a thickness of 80 μm was formed on one surface (surface S1) of the top plate body. As the coating method, the gravure coating method was used.

[0048] Next, on the other surface (surface S2) of the top plate body, coating liquid B was applied at a coating amount of 32 g / m 2 Applied at [specified condition], irradiated with ultraviolet rays using a UV lamp, and the applied coating liquid B was cured to form the first coating layer. On the first coating layer, coating liquid B was applied at a coating amount of 20 g / m 2 Applied at [specified condition], irradiated with ultraviolet rays using a UV lamp, and the applied coating liquid B was cured to form the second coating layer. On the second coating layer, coating liquid B was applied at a coating amount of 7 g / m 2 Applied at [specified condition], irradiated with ultraviolet rays using a UV lamp, and the applied coating liquid A was cured to form the third coating layer. Thus, a coating layer with a thickness of 50 μm was formed on the other surface (surface S2) of the top plate body. As the coating method, the gravure coating method was used. Note that the coating process on the other surface (surface S2) of the top plate body does not have to be the above-mentioned multiple coatings and coating amounts, and it can be appropriately carried out in the same way as general UV coating.

[0049] (Fabrication of the top plate support part) On one surface (surface S6) of a top plate support part body with dimensions of 1140 mm × 690 mm × 24 mm, a coating layer with a thickness of 80 μm was formed in the same manner as the top plate using coating liquid A. Next, on the other surface (surface S5) of the top plate support part body, a coating layer with a thickness of 50 μm was formed in the same manner as the top plate using coating liquid B.

[0050] <Comparative Example 1> A top plate was produced in Comparative Example 1 in the same manner as in Example 1, except that the coating liquid A applied to one surface of the top plate body was changed to coating liquid B.

[0051] A top plate support part of Comparative Example 1 was produced in the same manner as in Example 1, except that the coating liquid A applied to one surface of the top plate support part was changed to coating liquid B.

[0052] (Evaluation) In a 2.5 mm × 2.5 mm area on the surface of the coating layer of each of the top plate and the top plate support part, a plane profile was measured using an optical interference type surface roughness measuring instrument (model: VS1800, manufactured by Hitachi High-Tech Corporation). The value of the arithmetic mean roughness (Ra) was determined based on JIS B 0601:2013 from the obtained plane profile. The arithmetic mean roughness of the coating layer of the top plate (surface S3) and the top plate support part (surface S8) in Example 1 was 7.716 μm and 7.750 mm, respectively, and the arithmetic mean roughness of the coating layer of the top plate (surface S3) and the top plate support part (surface S8) in Comparative Example 1 was 3.840 μm and 3.812 μm, respectively.

[0053] A kotatsu futon was laid on a stainless steel plate installed on a smooth floor surface, and the edge of the kotatsu futon was fixed to the stainless steel plate. The top plate was placed on the kotatsu futon so that the coating layer contacted the kotatsu futon, and the top plate was pulled horizontally at a speed of 300 mm / min, and the maximum force when the top plate started to slide was measured to calculate the static friction coefficient. The top plate support part was placed on the kotatsu futon so that the coating layer contacted the kotatsu futon, and the same measurement was performed for the top plate support part to calculate the static friction coefficient. The static friction coefficients of the top plate (surface S3) and the top plate support part (surface S8) in Example 1 were 0.53 and 0.65, respectively, and the static friction coefficients of the top plate (surface S3) and the top plate support part (surface S8) in Comparative Example 1 were 0.31 and 0.37, respectively.

[0054] As described above, the embodiments have been explained. However, the above embodiments are presented as examples, and the present invention is not limited by the above embodiments. The above embodiments can be implemented in various other forms, and various combinations, omissions, replacements, changes, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0055] 1 Table for Kotatsu 2 Top Plate Support Portion 20 Top Plate Support Portion Body 21 Third Coating Layer 22 Fourth Coating Layer 23 Screw Hole 3 Leg 31 First Leg 32 Second Leg 4 Top Plate 40 Top Plate Body 41 First Coating Layer 42 Second Coating Layer 43 Female Screw Hole 5 Screw 6 Heater

Claims

1. A top plate support portion equipped with a heater, A plurality of legs that support the top plate support portion at a predetermined height, A top plate placed on the top plate support portion, The top plate has a top plate body, a first coating layer applied to the back surface of the top plate body, and a second coating layer applied to the front surface of the top plate body, The first coating layer contains fine particles for forming a rough surface that have heat resistance against the heat of the heater, and forms a rough surface on the back surface of the top plate body to suppress the displacement of the top plate with respect to the kotatsu futon, The second coating layer does not contain the fine particles for forming a rough surface contained in the first coating layer and maintains the front surface of the top plate as a smooth surface, A kotatsu table.

2. The arithmetic mean roughness of the first coating layer is from 4 μm to 100 μm, according to the kotatsu table of Claim 1.

3. The average particle diameter of the fine particles for forming a rough surface is from 0.5 μm to 50 μm, according to the kotatsu table of Claim 2.

4. The first coating layer is composed of a coating film containing a synthetic resin material, The content of the fine particles for forming a rough surface is from 10% by mass to 60% by mass with respect to the total mass of the first coating layer, according to the kotatsu table of Claim 1.

5. The thickness of the first coating layer is from 16 μm to 400 μm, according to the kotatsu table of Claim 1.

6. The second coating layer is composed of a coating film containing a synthetic resin material and does not contain the fine particles for forming a rough surface, according to the kotatsu table of Claim 1.

7. The top plate support portion has a top plate support portion body and a third coating layer containing fine particles for forming a rough surface provided on the surface of the top plate support portion body facing the top plate, according to the kotatsu table of Claim 1.

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