JP6689550B2 - Wood floorboard and method for manufacturing wood floorboard - Google Patents

Description

  The present invention relates to a wooden floorboard in which delamination of wood on the surface is suppressed and a method for manufacturing the same.

  In Japan, wooden floorboards are used for the floors of many indoor exercise facilities such as gymnasiums. With regard to this wooden floor, it has been reported that a part of the peeled floorboard is pierced and injured, which is a problem ("Causes such as accidents based on Article 23, Paragraph 1 of the Consumer Safety Act" Investigation report "Injury accident due to peeling of floorboards in gymnasium", Consumer Safety Investigation Committee, May 29, 2017).

  In order to prevent such an injury accident, a technique for suppressing the peeling of the floor board is required. In this regard, in Patent Document 1, as a floor material that suppresses the occurrence of cracks due to drying shrinkage due to the heat of floor heating, a thickness of 0.6 is formed on the surface of a base material formed by laminating a plurality of wooden floor boards. A wood board of about 2.0 mm is attached so that its fiber direction intersects with the fiber direction of the wood veneer on the surface of the base material, and a plurality of wood narrow boards are attached to the surface of the wood board. Of the flooring material, which are arranged side by side and affixed so as to be adjacent to each other so that the fiber directions of the above cross the fiber directions of the wood board.

JP-A-11-62196

  However, the flooring material described in Patent Document 1 suppresses the dry shrinkage of the "narrow board" constituting the front surface of the floor board by attaching the "wood board" to the back surface so that the fiber directions intersect. Therefore, it is unclear whether or not part of the wood can be effectively prevented from peeling off on the surface of the floor board (that is, the surface of the narrow board). Further, since the flooring material has a structure of at least three layers, it is considered to require a considerable cost for manufacturing, and it is not practical as a flooring board used in a large amount in a gymnasium or the like. That is, even in view of the above patent documents, it cannot be said that the development of the technique for suppressing the peeling on the surface of the floor plate has been sufficiently made.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a wooden floorboard in which delamination of wood on the surface is suppressed, a method for manufacturing the same, and an indoor exercise facility including the wooden floorboard. .

  So-called flooring for homes is generally covered with painted floorboards, whereas wooden floors such as indoor exercise facilities are coated with unpainted or semi-painted floorboards and then finished with paint on site. The method of painting is adopted. This is because it is necessary to change the aspect of surface coating according to the facility, such as drawing a court line for competition after the floorboard is stretched. A polyurethane resin paint having high adhesion is generally used as the finish paint.

  The present inventors considered that one of the mechanisms by which the wooden floorboard is peeled off is shown in FIG. That is, as shown in FIG. 1 (a), during the construction of the wooden floor, the finish paint enters the gap between the adjacent wooden floor boards and hardens to form the coating film 3. As a result, the adjacent floor boards firmly adhere to each other with the coating film interposed therebetween. On the other hand, wood absorbs water and expands, or releases water and contracts, depending on the humidity of the environment. Therefore, although the wooden floorboard may shrink, since the adhesion between the coating film of the finish paint and the wood is larger than the cohesive force between the wood fibers, as shown in FIG. The shrinkage destroys the cohesion between the wood fibers, causing cracks on the sides of the adjacent floorboards. Such cracks mainly occur on the longitudinal side surface of the floorboard which is parallel to the wood fibers. The thin pieces generated by this crack turn up and peel off. A piece of wood that has peeled off and rises up like a fluff is also called a "sakure", and is thought to be the cause of an injury accident.

  Therefore, as a result of intensive studies, the present inventors have formed a low adhesion layer 2 on the side surface of the wooden floorboard 1 that breaks or separates prior to the breakage of the cohesion between the wood fibers, as shown in FIG. It was found that by doing so, cracking, flaking or splintering of the wooden floorboard 1 can be effectively suppressed. Further, it has been found that by forming the low adhesion layer 2 on the side surface of the wooden floorboard 1 while not forming it on the surface, cracking, flaking or blistering can be suppressed without causing poor adhesion of the finish paint on the surface. Therefore, based on these findings, the following inventions have been completed.

(1) The wood floorboard according to the present invention is a wood floorboard in which a low adhesion layer is formed on the upper side surface and a low adhesion layer is not formed on the surface.

(2) In the wooden floorboard according to the present invention, the low adhesion layer is a layer in which at least one of the forces (i) to (iii) on the right is smaller than the cohesive force between the wood fibers of the wooden floorboard. (I) Shape retention of the low adhesion layer, (ii) Adhesion between the low adhesion layer and the wood of the wooden floorboard, (iii) Adhesion between the low adhesion layer and the coating film of the finish paint.

(3) The wood floorboard according to the present invention is tongue-processed, and the upper part of the side surface on which the low adhesion layer is formed may be the upper side surface of the male or female tongue formed on the side surface.

(4) The wood floor board according to the present invention is a piece of interlocking processed, and the upper part of the side surface on which the low adhesion layer is formed is the side end surface of the front surface side protruding portion or the front surface side cutout portion formed on the side surface. It may be.

(5) The wooden floorboard according to the present invention can be suitably used as a floorboard for indoor exercise facilities.

(6) In the wooden floor board according to the present invention, it is preferable that the low adhesion layer contains wax.

(7) The method for manufacturing a wooden floorboard according to the present invention has a step of coating the low-adhesion coating agent on the upper side surface of the wooden floorboard without coating the surface of the wooden floorboard.

(8) In the method for manufacturing a wooden floor board according to the present invention, the low-adhesion coating agent is preferably wax or a colloid solution containing wax as a dispersed phase.

(9) An indoor exercise facility according to the present invention comprises the wooden floorboard according to the present invention.

  According to the present invention, there is provided a wooden floorboard in which delamination of wood on the surface is suppressed. Therefore, the possibility of the above-mentioned injury accident in the facility having the wooden floor can be reduced, and the safety of the facility can be enhanced.

  Further, according to the present invention, there is provided a wooden floorboard in which peeling of wood is suppressed and there is no fear of poor adhesion of the finish paint on the surface. Therefore, since there is no need to change or add a process to the conventional wooden floor construction procedure, it is possible to obtain a wooden floor board that is safe and can be easily used.

It is a schematic diagram which shows the mechanism which a wooden floor board peels, which the present inventors consider taking the wooden floor board which was tongue-processed as an example. It is a schematic diagram which shows the mechanism which suppresses the peeling of a wooden floorboard which the present inventors consider considering the wooden floorboard which was tongue-processed as an example. It is a schematic diagram which shows the name of each part of a wooden floorboard. It is a schematic diagram which shows the name of each part of the wooden floorboard by which the tongue processing was carried out. It is a schematic diagram which shows the name of each part of the wooden floorboard by which the phase adjustment process was carried out. (A) is a photograph showing a mode of the tensile test, and (b) is a schematic diagram thereof. In (b), the thick arrow indicates the pulling direction. It is a photograph which shows the test material applicable to each of evaluation 0-3 of the peeling condition of wood.

  Hereinafter, the wooden floorboard 1, the method for manufacturing the wooden floorboard, and the indoor exercise facility according to the present invention will be described in detail with reference to the drawings.

  In the present invention, the “wood floorboard” means a floorboard using wood as a base material, or a floorboard using wood for at least the surface layer material.

  The names of the parts of the wooden floorboard 1 according to the present invention are shown in FIG. As shown in the figure, when used as a floorboard, the upper surface is the "front surface" 11, the lower surface is the "rear surface" 12, and the four surfaces perpendicular to the ground are all "side surfaces". That's 13. That is, in one wooden floorboard 1, there are a total of four side surfaces 13, two in each of the lateral direction and the longitudinal direction. Such a name is similarly used for the test wood pieces of Examples 1 to 3 described later.

  The side surface 13 of the wooden floorboard 1 may be unprocessed as shown in FIG. 3 or may be processed in some way. Examples of the processing of the side surface 13 include the tongue processing shown in FIG. 4 and the phase scooping processing shown in FIG. 5. In the present invention, any of these processed is preferably used. You can Further, the processing of the side surface 13 may be performed on all of the four side surfaces 13, and as shown in FIGS. 4 and 5, only in the longitudinal direction, only in the lateral direction, or in the four side surfaces 13. It may be applied on one or more sides.

  The wooden floorboard 1 according to the present invention is a wooden floorboard in which the low adhesion layer 2 is formed on the upper side surface 13 and the low adhesion layer 2 is not formed on the surface 11. Here, the “upper part of the side surface 13” means an upper part (side surface 11 side) of the side surface 13. In light of the delamination suppression mechanism of the wooden floorboard 1 shown in FIG. 2, it is clear that cracking or delamination in the vicinity of the surface 11 of the wooden floorboard 1 can be suppressed if a low adhesion layer is formed at least on the upper side surface 13. . As the upper portion of the side surface 13, specifically, for example, the upper half of the side surface 13, upper side 1/3, upper side 1/4, upper side 1/5, and the like can be mentioned. Further, the low adhesion layer 2 may be formed on the entire side surface 13 (including the upper portion).

  The side surface 13 on which the low adhesion layer 2 is formed is at least the longitudinal side surface 13. Since cracking or peeling of the floorboard often occurs along the fiber direction of the wood (that is, the longitudinal direction of the floorboard), by forming the low adhesion layer 2 on the side surface 13 in the longitudinal direction, the cracking or peeling is effective. Can be suppressed to. However, the low adhesion layer 2 may be formed on the side surface 13 in either the longitudinal direction or the lateral direction.

  Further, as shown in Example 3 described later, if the low adhesion layer 2 is formed on at least one of the adjacent side faces 13 (in other words, the side faces 13 that are arranged adjacent to each other and face each other), sufficient peeling is achieved. A suppression effect is obtained. Therefore, the low adhesion layer 2 may be formed on at least one of the two side surfaces 13 in the longitudinal direction or the lateral direction, but the low adhesion layer 2 may be formed on the two side surfaces 13 in the longitudinal direction or the lateral direction, or on all four side surfaces 13. The adhesion layer 2 may be formed.

  In the tongue-finished wooden floorboard 1, as shown in FIG. 4, the upper side surface 16 of the male tongue 14 or the female tongue 15 formed on the side surface 13 is exemplified as “the upper portion of the side surface 13”. That is, when the wooden floorboard 1 according to the present invention is tongue-finished, the low adhesion layer 2 is preferably formed on the upper side surface 16 of the male tongue 14 or the female tongue 15.

  In the wooden floorboard 1 that has been subjected to the interlocking process, as shown in FIG. 5, the side end surface 19 of the front surface 11 side protruding portion 17 or the front surface 11 side cutout portion 18 formed on the side surface 13 serves as an “upper side surface 13”. It is illustrated. That is, when the wooden floorboard 1 according to the present invention is processed by interlocking, it is preferable that the low adhesion layer 2 is formed on the side end surface 19 of the front surface side protruding portion 17 or the front surface side cutout portion 18.

  In the present invention, the low adhesion layer 2 refers to (i) the shape retention force of the low adhesion layer 2 and (ii) the low adhesion layer 2 and the wooden floor board 1 as compared with the cohesive force between the wood fibers of the wooden floor board 1. At least one of (i) to (iii) of the adhesion force with wood and (iii) the adhesion force between the low adhesion layer 2 and the coating film 3 of the finish paint is small. Since the low-adhesion layer 2 has such a property, when the floor boards contract and a tensile force is applied in a direction of separating the adjacent floor boards, the low-adhesion layer 2 breaks or separates prior to the breaking of the cohesion between the wood fibers.

  The "cohesive force between wood fibers" is an attractive force that acts between wood fibers and is a force that is a predisposing factor for maintaining a certain shape of wood. That is, in the present invention, the cohesive force between the wood fibers can be used interchangeably with the "wood shape-retaining force".

  That is, when the force of (i) is the smallest among the cohesive force between the wood fibers of the wooden floor board 1 and the forces of (i) to (iii) described above, the pulling force shown in FIG. As shown in, the low adhesion layer 2 itself is destroyed. When the force of (ii) is the smallest, the low adhesion layer 2 and the wood are separated, as shown in FIG. 2 (c). Further, when the force of (iii) is the smallest, as shown in FIG. 2D, the low adhesion layer 2 and the coating film 3 of the finish paint are separated. In any of these modes, as a result, the destruction of the cohesion between the wood fibers is suppressed, so that the presence of the low adhesion layer on the side surface 13 suppresses cracks or peeling on the surface 11 of the wooden floorboard 1. can do.

  In the present invention, the finish paint means a paint that is applied to the surface of the floorboard at the site after the floorboard is stretched at the place of use. Finishing paints are roughly classified into oil-based paints and water-based paints, and those containing polyurethane resin as a coating film forming component are often used. The components of the finish paint according to the present invention are not particularly limited, and any of these can be used.

  As described above, in the present invention, the property that the forces (i) to (iii) are smaller than the cohesive force between the wood fibers is referred to as “low adhesion”.

  The low-adhesion layer 2 may be composed of any component as long as it has low adhesion, but specifically, for example, wax (wax) may be used as its effective component (a component that is the main cause of exhibiting low adhesion). ), Silicone, polytetrafluoroethylene and the like.

  Here, the wax is generally a hydrocarbon which is a soft and smooth solid at room temperature, has a melting point lower than the boiling point of water (100 ° C.), and has a property of liquefying at a relatively low temperature when heated. , Higher fatty acids, or esters of higher fatty acids with monohydric or dihydric higher alcohols. Waxes are roughly classified into natural waxes obtained by purifying minerals such as animals, plants or petroleum, and synthetic waxes obtained by chemical synthesis. Specifically, various waxes shown in Table 1 are used. It can be illustrated.

  Due to the general property of these waxes that they are soft and smooth solids at room temperature, when they are applied to the wooden floorboard 1, a layer with low adhesion can be formed. Further, since it is an individual at room temperature, the wax applied to the side surface 13 of the wooden floorboard 1 does not exude to the surface 11, and there is a concern that the low adhesion layer 2 is formed on the surface 11 and causes poor adhesion of the finish paint. Nor. Therefore, a suitable low adhesion layer 2 can be formed by using any of the waxes shown in Table 1.

  The wooden floorboard 1 according to the present invention can be produced by forming the low adhesion layer 2 on the upper surface of the side surface 13 of the wooden floorboard 1 instead of forming it on the surface 11. The low adhesion layer 2 can be formed by applying a low adhesion coating agent.

  Here, in the present invention, the "low-adhesion coating agent" is a solid or liquid coating agent for coating wood, and when it is coated on wood, the active ingredient is almost not present inside the wood fiber. It means that a coating film (layer) is formed on the coated surface without permeation and the layer has low adhesion.

  As the active ingredient of the low adhesion coating agent, similar to the active ingredient of the low adhesion layer 2, wax (wax), silicone, polytetrafluoroethylene and the like can be mentioned. The low-adhesion coating agent may contain a component other than the active ingredient such as a solvent and a colorant (pigment), and the form thereof may be solid or liquid. The liquid state in this case includes emulsions, foams, gels, suspensions, and the like, in addition to solutions.

  For example, when wax is used as an active ingredient, solid or liquid wax itself or a colloid solution containing wax as a dispersion layer can be used as the low adhesion coating agent. The "colloidal solution containing wax as a dispersion layer" refers to a liquid such as emulsion, gel, suspension or foam containing fine particles of wax.

  The method of coating can be appropriately adopted depending on the mode of the low-adhesion coating agent, for example, if the low-adhesion coating agent is liquid, brush coating, spraying by a spray method, roll coater, curtain flow coater, It can be applied by methods such as electrostatic painting and ironing. If the low-adhesion coating agent is solid, the solid can be applied by pressing the solid against the upper portion of the side surface 13 and moving it so as to rub it.

  Next, the present invention provides a method for manufacturing a wooden floorboard. The method for manufacturing a wooden floorboard according to the present invention has a step of coating the low adhesion coating agent on the upper portion of the side surface 13 of the wooden floorboard 1 without coating the surface 11 of the wooden floorboard 1. In the method, the same or corresponding invention specifying matters as those of the wooden floor board 1 according to the present invention described above will not be described again.

  Finally, the present invention provides an indoor exercise facility characterized by including the wooden floorboard 1 according to the present invention. The indoor exercise facility according to the present invention can be made by arranging the wooden floorboards 1 according to the present invention side by side during flooring. That is, in the conventional floor design / construction method, by using the wooden floorboard 1 according to the present invention in place of the conventional floorboard, the indoor exercise facility according to the present invention can be created. Usage as a sports facility, cleaning, maintenance and the like can be performed in the same manner as in a conventional indoor exercise facility.

  That is, since the indoor exercise facility according to the present invention is provided with the wooden floorboard 1 according to the present invention, the peeling of the floorboard is suppressed, and therefore the safety is higher than that of the conventional facility provided with the wooden floorboard. There is. Further, since the indoor exercise facility according to the present invention does not require any special device, change, labor or cost in use including construction and maintenance, it can be constructed and installed in the same manner as a facility equipped with a conventional wooden floorboard. It can be used and is significantly safer than before.

  In addition, the indoor exercise facility refers to a facility provided with a roof, a floor, and a wall for indoor sports, and specifically, for example, a gymnasium for playing basketball, volleyball, tennis, badminton, running, table tennis, or the like. , Kendo, judo, martial arts halls for performing naginata, etc.

  Hereinafter, the wooden floorboard 1, the method for manufacturing the wooden floorboard, and the indoor exercise facility according to the present invention will be described based on Examples. The technical scope of the present invention is not limited to the features shown by these examples.

  In this example,% represents mass percentage ((w / w)%) unless otherwise specified.

<Example 1> Examination of delamination inhibiting effect on wood Test wood pieces of the same quality as those used for floor boards (thickness 7 mm, width 28.6 mm, length 300 mm, longitudinal direction coincides with fiber direction of wood) ) Was prepared. A test substance for coating on one side of the test piece in the longitudinal direction (commercial water repellent coating agent for wood, component: solid paraffin 1 to 5%, acrylic resin 30 to 35%, water 60 to 69%, form: Emulsion) was applied with a brush and applied, and allowed to stand at room temperature for 48 hours to dry. Hereinafter, the side coated with the test substance is referred to as the “painted side”.

  Next, two test pieces of wood were arranged and fixed on a base plate to which the double-sided tape was attached so that the coated side faces face each other, to prepare a test material. At this time, a gap of 0.1 mm was provided between the two test pieces. A total of 10 sets of this test material were prepared and designated as A1-A10. In addition, as a comparative control, 10 sets of similar test materials were prepared using test pieces having no coated side surface, and designated as D1 to D10.

Then, in accordance with [Chapter 9, Section 7, 9.7.2 Painting, line drawing] of the "Flooring upholstery standard specifications" (Japan Flooring Industry Association, issued March 1, 2015), test materials After finishing coating (two-component water-based polyurethane resin coating, trade name "Ureitate aqueous two-component", Daito Paint) on the surface of 4 times at a coating amount of 80 to 100 g / m ² / cycle, it is at room temperature for 2 weeks. I was cured.

  The base plate of the test material was removed, and the tensile test was performed according to the embodiment shown in FIGS. 6 (a) and 6 (b). As shown in the figure, the end portions of the respective test wood pieces 4 of the test material are held by the test piece gripping tool 5 of the tensile tester (“4467 type”, Instron) to separate the two test wood pieces. Up to 1 mm / min, the sample was pulled upward and the maximum breaking load (kg gram weight, kgf) was measured to calculate the average value. Further, the peeling state of the wood on the fracture surface 6 and the surface caused by the separation of the test piece was visually observed, and evaluated by the following criteria to calculate the average value. The results are shown in Table 2. An example of the test material corresponding to each of the evaluations 0 to 3 is shown in the photograph of FIG.

[Evaluation criteria for peeling of wood]
Evaluation 0: No peeling of wood is observed on either the fracture surface or the surface.
Evaluation 1: There is slight fuzz on the fracture surface.
Evaluation 2: There is peeling of wood on the fracture surface.
Evaluation 3: There is destruction of wood from the fracture surface to the surface.

  As shown in Table 2, the average value of the maximum breaking loads was 41.460 kgf for the test materials A1 to A10, whereas it was 64.464 kgf for the test materials D1 to D10. That is, it was revealed that the test material having the painted side surface had a significantly smaller maximum breaking load than the test material having no painted side surface, and thus the test material was separated by a smaller tensile force.

  Further, the average value of the peeling condition evaluation of the wood was 0 for the test materials of A1 to A10, while it was 2.3 for the test materials of D1 to D10. That is, since the average value of the test material having the coated side surface is significantly smaller than that of the test material having no coated side surface, it is clear that the presence of the coated side surface significantly suppressed the peeling of wood. Became.

  From these results, it became clear that by coating with a colloidal solution containing wax as a dispersed phase, a low adhesion layer that breaks or separates before the breakage of cohesion between wood fibers can be formed. Moreover, it was clarified that peeling of wood on the surface can be suppressed by forming a low adhesion layer on the side surface of the wooden floorboard.

<Example 2> Examination of components of low adhesion layer A test material was prepared by the method described in Example 1. However, the test substances used were test substances 1 to 7 shown in Table 3. The test substances 1 to 3 and 5 to 7 were applied with a brush, and the test substance 4 was applied by a spray method.

A tensile test was performed on the prepared test material by the method described in Example 1, the fracture surface was visually observed, and the low adhesion and surface exudation of the test substance were evaluated according to the following criteria. The results are shown in Table 4.
[Low adhesion evaluation criteria]
Yes: No peeling of wood is observed on either the fracture surface or the surface.
None: Delamination of wood is observed on at least one of fracture surface and surface.
[Evaluation criteria for surface exudation]
Yes: The test substance applied to the sides oozes on the surface.
None: The test substance applied to the side did not seep to the surface.

  As shown in Table 4, the test substance 1 and the test substance 2 had low adhesion when the coating film formed by applying the test substance had residual water content, but the coating film was completely dried. In this case, since the low adhesiveness disappeared, the evaluation was “Somewhat”. Further, it has been revealed that the coating film is not suitable for use as a paint for wooden floor boards because of the concern about microbial growth.

  Next, the test substance 3, the test substance 4, and the test substance 5 had a large degree of surface exudation, although the low adhesion was “slightly present” or “present”. That is, it has been clarified that when applied to the side surface of the wooden floorboard, there is a risk of causing poor adhesion of the finish paint on the surface.

  On the other hand, the test substances 6 and 7 had sufficiently low adhesion and effectively suppressed the peeling of wood. Also, there was no surface exudation.

  From these results, it was clarified that the wax or the colloidal solution containing the wax as the dispersed phase had low adhesion and no surface exudation. That is, it has been clarified that the low adhesion layer formed on the side surface of the wooden floorboard is preferably a wax-containing material in that the peeling of the wood can be suppressed without causing poor adhesion of the finish paint on the surface. .

<Example 3> Examination of effectiveness of single-sided coating With respect to the test substance 6 and the test substance 7 of Example 2, the same tests as in Example 2 were performed. However, in the longitudinal side surfaces of the two test wood pieces facing each other in the test material, only one coated side surface was used and the other one surface was not coated with the test substance.

  The low adhesion was evaluated by visually observing the fracture surface produced by the tensile test. As a result, it had a sufficiently low adhesiveness to the same extent as the result of Example 2. From this result, it became clear that the peeling of the wood can be suppressed by forming the low adhesion layer on at least one side surface in the longitudinal direction of the wooden floorboard.

1 Wood floorboard 2 Low adhesion layer 3 Coating film of finish paint 4 Test piece 5 Test piece gripper 6 Fracture surface 11 Front surface 12 Back surface 13 Side surface 14 Male groove 15 Female groove 16 Upper side surface 17 Surface side protrusion 18 Surface side notch 19 Side edge

Claims (8)

A low adhesion layer is formed on the upper part of the side surface, and a wooden floorboard in which a low adhesion layer is not formed on the surface, wherein the low adhesion layer is compared with the cohesive force between the wood fibers of the wooden floorboard. The wooden floor board, wherein at least one of the following forces (i) to (iii) is a small layer:
(i) the shape retention of the low adhesion layer,
(ii) adhesion between the low adhesion layer and the wood of the wooden floorboard,
(iii) Adhesion between the low adhesion layer and the coating film of the finish paint. The wood floorboard according to claim 1 , wherein the wood floorboard is tongue-processed, and the upper portion of the side surface is an upper side surface of a male or female rooster formed on the side surface.   2. The wooden floorboard according to claim 1, wherein the wooden floorboard is processed by interlocking, and the upper portion of the side surface is a side end surface of a front surface side protruding portion or a front surface side cutout portion formed on the side surface. A indoor sports facilities for floorboards, wood floorboard as claimed in any one of claims 1-3. Wherein the low adhesion layer, comprising the wax, wood floorboard as claimed in any one of claims 1-4. A method for producing a wooden floorboard, which comprises a step of forming a low-adhesion layer by coating the low-adhesion coating agent on the upper surface of the side surface of the wooden floorboard without coating the surface of the wooden floorboard. The production method, wherein the adhesion layer is a layer in which at least one of the following forces (i) to (iii) is smaller than the cohesive force between the wood fibers of the wooden floorboard:
(i) the shape retention of the low adhesion layer,
(ii) adhesion between the low adhesion layer and the wood of the wooden floorboard,
(iii) Adhesion between the low adhesion layer and the coating film of the finish paint . The method for producing a wooden floorboard according to claim 6 , wherein the low-adhesion coating agent is wax or a colloidal solution containing wax as a dispersed phase. Indoor sports facilities, characterized in that it comprises a wood floor according to any one of claims 1-5.