Wood flooring and manufacturing method thereof

Abstract

To provide a wooden floor material easy for construction, causing no sinking of the wooden floor material, and capable of absorbing unevenness of a substrate for setting the wooden floor material, and a manufacturing method thereof.SOLUTION: A wooden floor material has a wooden substrate 2, a decorative material 4 provided on a front face side of the wooden substrate 2, and an absorbing material 3 directly jointed to a rear face side of the wooden substrate 2. Thickness of the wooden substrate 2 is 1.5 mm or more and 3.0 mm or less, thickness of the absorbing material 3 is 0.2 mm or more and 0.5 mm or less, an adhesion force of the absorbing material 3 by flat tension test is 0.045 N / mm2 or more and 0.075 N / mm2 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to wood flooring and a method for making wood flooring. [Background technology]

[0002] When renovating the interior of a building, there are cases where new flooring is installed on the surface of the existing flooring without removing the existing one. This makes it possible to carry out renovation work easily, as it does not require the work of peeling the flooring off the base material to which it is firmly attached, or smoothing the base surface again.

[0003] Patent Document 1 listed below discloses a technology for a wooden flooring material in which an adhesive layer is provided on the back side of a wooden base material and the thickness of the wooden base material is 0.8 mm to 2.0 mm, which enables the material to adhere well to an uneven base material without requiring additional work and effort. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-218730 A Summary of the Invention [Problem to be solved by the invention]

[0005] Existing stores and houses are examples of buildings in which flooring is laid on existing floor surfaces in renovation work. In existing stores, the unevenness occurring on the surface of the flooring is large and the number of unevenness is large. For this reason, as flooring for renovation of stores, as in the wooden flooring 50 shown in FIG. 5, the thickness of the wooden base material 51 may be set to 0.8 mm to 2.0 mm, and the wooden base material 51 may be made of a material having elasticity that makes it easy to bend. This allows the unevenness to be absorbed when the flooring for renovation is laid on a flooring surface with relatively large unevenness. In the wooden flooring 50 in FIG. 5, the decorative material 54, the wooden base material 51, the cushioning material 52, the adsorbent material 53, and the release sheet 55 are layered in this order from the upper surface side when laid.

[0006] Furthermore, in a store, compared to a residence, users such as store clerks and customers spend more time standing and walk around frequently, so wooden flooring 50 layered with cushioning material 52 such as synthetic resin foam, as shown in Figure 5, is used.

[0007] On the other hand, when a wooden flooring material 50 having a cushioning material 52 is applied to a house or the like, the wooden flooring material 50 may sink when a load is applied from the legs or casters of a chair, and a step may occur between the adjacent wooden flooring materials 50. When a step occurs, the end surface of the wooden substrate 51 of the adjacent wooden flooring material 50 is exposed. As a result, when the legs or casters of a chair are dragged, the legs or casters come into contact with the end surface of the wooden substrate 51, causing a problem that the wooden flooring material 50 may be chipped. Therefore, when laying a flooring material for renovation in a house where dragging of chairs occurs, it is necessary to prevent defects such as chipping of the flooring material due to sinking of the flooring material.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide a wood flooring material and a manufacturing method for wood flooring material that is easy to install, does not cause sinking of the wood flooring material, and is capable of absorbing unevenness in the base on which the wood flooring material is installed. [Means for solving the problem]

[0009] In order to solve the above problems, the wood flooring material and the method for manufacturing the wood flooring material of the present invention employ the following measures. That is, the wood flooring material according to the present invention comprises a wood base material, a decorative material provided on the front side of the wood base material, and an adhesion layer directly bonded to the back side of the wood base material, the thickness of the wood base material being 1.5 mm to 3.0 mm, the thickness of the adhesion layer being 0.2 mm to 0.5 mm, and the adhesion strength of the adhesion layer in a flat tensile test being 0.045 N / mm 2 More than 0.075N / mm 2 The following is the result.

[0010] With this structure, the thickness of the wood base material is 1.5 mm to 3.0 mm, so the rigidity required for wood flooring is ensured, and the thickness of the adhesion layer is 0.2 mm to 0.5 mm, so even if a shock absorbing layer such as a cushioning material is not provided, the adhesion layer alone can absorb unevenness and is less likely to sink under load. In addition, the adhesion strength of the adhesion layer in a flat tensile test is 0.045 N / mm 2 More than 0.075N / mm 2 Since the above-mentioned condition is satisfied, the adsorption performance can be ensured and the construction can be easily carried out on a floor with relatively small unevenness.

[0011] The above-mentioned wooden flooring material may further comprise a release sheet provided on the surface of the adhesion layer opposite the wood base material, the release sheet being a synthetic resin foam.

[0012] According to this configuration, the release sheet prevents the adhesion layer from being exposed during storage or transportation of the wooden flooring material, and the adhesion layer is exposed by peeling off the release sheet when the wooden flooring material is installed. Since the release sheet is a synthetic resin foam, when the adhesion layer has a thickness of 0.2 mm or more and 0.5 mm or less, it is likely to be in close contact with the adhesion layer.

[0013] In the above-mentioned wooden flooring material, the specific gravity of the release sheet is 0.9 g / cm 3 More than 1.1g / cm 3 It is desirable that the following:

[0014] According to this configuration, the specific gravity of the release sheet is 0.9 g / cm 3 More than 1.1g / cm 3 Since this is less than or equal to the thickness of the release sheet, problems such as the release sheet cracking or lifting off from the adhesive layer are unlikely to occur when the wood flooring material is cut into the desired shape.

[0015] In the above-mentioned wooden flooring material, it is desirable that the release sheet has a thickness of 0.03 mm or more and 0.07 mm or less.

[0016] According to this configuration, the thickness of the release sheet is between 0.03 mm and 0.07 mm, so that when cutting the wood flooring material into the desired shape, problems such as the release sheet cracking or floating away from the adhesive layer are less likely to occur.

[0017] In the above-mentioned wooden flooring material, the bending stiffness of the wooden base material is 15×10 4 N mm 2 Over 150 x 10 4 N mm 2 It is desirable that the following:

[0018] According to this configuration, the bending stiffness of the wood base material is 15×10 4 N mm 2 Over 150 x 10 4 N mm 2 Since the thickness is less than or equal to the thickness of the wooden flooring, the rigidity required for the wooden flooring is ensured.

[0019] The method for manufacturing a wooden flooring material according to the present invention includes the steps of providing a decorative material on the front side of a wooden substrate having a thickness of 1.5 mm to 3.0 mm, providing an adhesion layer having a thickness of 0.2 mm to 0.5 mm on the back side of the wooden substrate on which the decorative material is provided, and cutting the wooden substrate on which the adhesion layer is provided. The adhesion strength of the adhesion layer in a flat tensile test is 0.045 N / mm. 2 More than 0.075N / mm 2 The following is the result.

[0020] According to this configuration, the decorative material is provided on the front side of the wood substrate, and then the adhesion layer is provided on the back side of the wood substrate. Therefore, unlike a case in which the adhesion layer is provided on the wood substrate before the decorative material and then the decorative material is provided on the wood substrate, the adhesion layer is pressed against the wood substrate by, for example, a roll press only once, which reduces crushing of the adhesion layer. Effect of the Invention

[0021] According to the present invention, construction is easy, sinking of the wooden flooring does not occur, and unevenness of the base on which the wooden flooring is installed can be absorbed. [Brief description of the drawings]

[0022] [Figure 1] 1 is a vertical cross-sectional view showing a wood flooring material according to one embodiment of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing a method for measuring the adsorptive power of an adsorbent for a wooden floor material. [Diagram 3] FIG. 2 is a schematic longitudinal cross-sectional view showing a woodworking machine used in a cutting process for manufacturing a wooden flooring material according to one embodiment of the present invention, as viewed from the side in the flow direction of the base material. [Figure 4] FIG. 2 is a schematic longitudinal cross-sectional view showing a woodworking machine used in a cutting process for manufacturing a wooden flooring material according to one embodiment of the present invention, as viewed from the rear in the flow direction of the base material. [Diagram 5] FIG. 1 is a vertical cross-sectional view showing a conventional wooden flooring material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] A wooden flooring material 1 according to one embodiment of the present invention will be described below with reference to the drawings. The wooden flooring material 1 is a long, strip-shaped member that is long in one direction, and multiple wooden flooring materials 1 are arranged in parallel with the ends of the wood facing each other to form a floor inside a building. The wooden flooring material 1 can be used for both newly constructed floors and remodeled floors laid on top of existing floors.

[0024] The floor on which the wooden flooring material 1 is applied may be a wooden flooring material made of a wood base material covered with a decorative material such as an olefin sheet, decorative paper, or veneer, or it may be a synthetic resin-based flooring material. In either case, the wooden flooring material 1 is adsorbed to the surface of the floor.

[0025] As shown in Fig. 1, the wooden flooring material 1 comprises a wooden base material 2, an adsorbent material 3, a decorative material 4, a release sheet 5, etc., and is layered in the order of decorative material 4, wooden base material 2, adsorbent material 3, and release sheet 5 from the top surface side when installed. Fig. 1 is a vertical cross-sectional view showing the wooden flooring material 1 according to this embodiment, and is a view cut parallel to the length direction or width direction of the wooden flooring material 1.

[0026] The wooden base material 2 is, for example, a medium density fiberboard (MDF). However, the wooden base material 2 is not limited to this example and may be other wood materials such as fiberboard, plywood, laminated veneer lumber (LVL), solid wood, laminated lumber, or composite boards thereof.

[0027] No male or female grains are formed on the four ends of the side edges of the wood base material 2, and the ends have a smooth surface. Adjacent wood flooring materials 1 are laid so that their ends are butted up against each other. This makes the construction of the wood flooring materials 1 easier, unlike when male or female grains are formed.

[0028] The back side of the wooden base material 2 has a smooth surface without any concave grooves or the like. Since there are no grooves on the back side, even if the wooden flooring 1 is installed in a wet area such as a bathroom or if water is spilled on the wooden flooring 1, water is unlikely to penetrate through the joints between the wooden flooring materials 1 to the back side of the wooden base material 2. Therefore, unlike when grooves are formed, water does not penetrate from the joints into the grooves, causing a decrease in the adsorption power of the adsorbent 3, and the wooden flooring 1 is unlikely to peel off.

[0029] The thickness of the wood base material 2 according to this embodiment is, for example, 2 mm. Since the wood flooring material 1 is used more frequently in homes than in existing stores, the unevenness on the floor surface is small and the number of unevenness is also small. The wood flooring material 1 according to this embodiment is suitable for renovation of homes and the like where the floor, which serves as the base material, does not have large unevenness like in stores and does not need to bend the wood base material 2.

[0030] The wooden base material 2 has a certain thickness, which can improve the rigidity of the wooden flooring 1. Unlike this embodiment, when the thickness of the wooden base material is about 1 mm, the wooden flooring will bend even when held in one hand. Therefore, if the cushioning material is not laminated as in the wooden flooring 1 according to this embodiment, the wooden flooring will easily break, which will cause problems with its durability as a wooden flooring.

[0031] The thickness of the wood base material 2 according to this embodiment is preferably 1.5 mm to 3.0 mm, more preferably 2.0 mm to 3.0 mm. If the thickness of the wood base material is less than 1.5 mm, it will not be rigid enough for use as a wood flooring material and may break or bend easily, making it difficult to attach a decorative material to the wood base material or to cut the wood flooring material with a blade.

[0032] Existing floors in houses and other buildings are generally smooth, but due to the contraction and expansion of the wood base material, the edges of the existing wood flooring material may push up against each other, creating uneven surfaces. If the thickness of the wood base material of the newly laid wood flooring material exceeds 3.0 mm, the wood flooring material will be too rigid to conform to the unevenness on the surface of the existing floor, and the adsorbent will not be able to adequately adsorb to the floor. In addition, due to its thickness, it cannot be easily cut with a cutter or the like, making installation time-consuming and laborious.

[0033] The bending stiffness of the wood base material 2 is, for example, 15×10 4 N mm 2 Over 150 x 10 4 N mm 2 This bending stiffness is calculated assuming that the width of the wood substrate 2 is 150 mm and the Young's modulus is 4400 N mm 2This is the value calculated using the above formula.

[0034] The adsorbent 3 is directly bonded to the back surface of the wooden base material 2. Between the wooden base material 2 and the adsorbent 3, no cushioning material such as a synthetic resin foam is placed.

[0035] The adsorbent 3 fixes the wooden flooring 1 to the floor, which serves as the base material. The adsorbent 3 is an example of an adhesive layer. The adsorbent 3 is, for example, an acrylic resin foam. The acrylic resin foam is, for example, a film or sheet, and is adhered to the wooden base material 2. The acrylic resin foam may be formed in a layer by applying an acrylic resin coating agent to the wooden base material 2. Each of the recesses formed by multiple fine air bubbles on the surface of the acrylic resin foam acts as a suction cup, allowing the adsorbent 3 to adhere to the base material or an existing floor.

[0036] The adhesion layer according to the present invention is not limited to the above-mentioned adsorbent 3. The adhesion layer may be, for example, an acrylic, silicone, rubber, urethane, or polyester adhesive as long as it can fix the wooden flooring material 1 to the floor that serves as the base material.

[0037] The adhesive force of the adhesive material 3 in a flat tensile test was 0.045 N / mm 2 More than 0.075N / mm 2 The following is the reason. Since floors in homes are used more frequently than in existing stores, the unevenness on the floor surface is small (unevenness of about 1 mm or less in the height direction) and the number of unevenness is also small. The above-mentioned range of adhesion force ensures adhesion performance for floors with relatively small unevenness. The wood flooring material 1 according to this embodiment is suitable for buildings such as homes, where the underlying floor does not have large unevenness like a store and does not require high adhesion force.

[0038] The wooden flooring material 1 has a relatively low adhesive force, so it is easy to install even for people who have little experience in installing interior building materials, such as residents. In other words, the adhesive force of the adhesive material 3 is set to a range that allows it to be reapplied or moved to the side even if it is installed in the wrong position. The adhesive force is 0.045 N / mm 2If the adhesive strength is less than 0.075N / mm, the adhesive strength is too weak and the sticker will peel off easily. 2 If it exceeds this value, the adhesive strength will be too strong, making it difficult to remove and reapply.

[0039] The thickness of the adsorbent 3 is, for example, 0.3 mm. The wooden flooring material 1 is not provided with a cushioning material or the like that serves as a shock absorbing layer. By having the adsorbent 3 have a predetermined thickness, the adsorbent 3 alone can absorb small unevenness and can be adsorbed while blending with the floor that is the base. The thickness of the adsorbent 3 is preferably 0.2 mm or more and 0.5 mm or less. If the thickness of the adsorbent is less than 0.2 mm, the adsorbent does not blend well with the unevenness of the base surface, and therefore cannot exert sufficient adsorption power. Also, if the thickness of the adsorbent exceeds 0.5 mm, an excess portion that does not exert an adsorption function is formed in the thickness direction of the adsorbent, and the adsorbent itself has cushioning properties. As a result, when the load of the chair legs or casters is applied, the adsorbent having the excess portion sinks, and a step is generated between the adjacent wooden flooring materials. As a result, when the legs or casters of the chair are dragged, the legs or casters come into contact with the end of the wood substrate, and the wooden flooring material may be chipped.

[0040] A decorative material 4 is provided on the front surface side of the wood base material 2. The decorative material 4 is, for example, a synthetic resin sheet such as an olefin sheet, decorative paper, veneer, or the like.

[0041] In addition, when the wood base material 2 and the decorative material 4 are bonded together, or when the wood base material 2 and the adsorbent material 3 are bonded together, the adhesive used may be a vinyl acetate resin, a PUR (polyurethane reactive) hot melt, or the like.

[0042] It is desirable to attach a release sheet 5 to the side of the adsorbent 3 opposite the wooden substrate 2, i.e., the surface of the adsorbent 3, during storage or transportation before construction. This prevents the adsorbent 3 from being exposed by the release sheet 5 during storage or transportation of the wooden flooring 1, and prevents a decrease in the adsorptivity of the adsorbent 3 before construction. The release sheet 5 is peeled off during construction to expose the adsorbent 3, and then the wooden flooring 1 is laid on the floor.

[0043] The release sheet 5 is preferably a sheet-shaped synthetic resin foam. The release sheet 5 is, for example, a foamed polyethylene terephthalate sheet (hereinafter also referred to as a "foamed PET sheet"). Since the release sheet 5 is a synthetic resin foam, when the thickness of the adsorbent 3 is 0.2 mm or more and 0.5 mm or less, the release sheet is likely to be in close contact with the adsorbent 3, unlike when the release sheet is paper or a synthetic resin sheet that is not a foam. In addition, when the wooden flooring 1 is cut into a desired shape, problems such as the release sheet 5 cracking or lifting from the contact layer are unlikely to occur.

[0044] Next, a method for manufacturing the wood flooring material 1 according to this embodiment will be described. The wooden flooring material 1 manufactured as described here has a wooden base material 2 made of MDF, an adsorbent material 3 made of acrylic resin foam, a decorative material 4 made of an olefin sheet, and a release sheet 5 made of a foamed PET sheet.

[0045] First, a board-shaped MDF is prepared to serve as the wood base material 2. The prepared MDF is, for example, 3 feet wide by 6 feet wide. An adhesive is applied to one side (front surface) of this MDF, and an olefin sheet to serve as the decorative material 4 is attached to it. When attaching the olefin sheet to the MDF, for example, roll pressing is performed.

[0046] In addition, a sheet-shaped acrylic foam serving as the adsorbent 3 and a foamed PET sheet serving as the release sheet 5 are integrated to produce an adsorbent sheet in which the acrylic foam and the foamed PET sheet are integrated. The adsorbent sheet is prepared as a member separate from the above-mentioned MDF. The adsorbent sheet is an example of the adhesive sheet according to the present invention.

[0047] Next, an adhesive is applied to the other surface (rear surface) of the MDF, and the above-mentioned adsorption sheet is attached so that the acrylic foam faces the MDF. When attaching the adsorption sheet to the MDF, for example, roll pressing is performed. In the above example, the case where an adsorption sheet in which an acrylic foam and a foamed PET sheet are integrated is described, but the present invention is not limited to this example. For example, an acrylic foam that becomes the adsorbent 3 may be provided on the other surface (rear surface) of the MDF, and then a foamed PET sheet that becomes the release sheet 5 may be attached to the exposed surface side of the acrylic foam.

[0048] According to the above process, after the olefin sheet that will become the decorative material 4 is provided on the front side of the MDF that will become the wooden substrate 2, an adsorbent sheet that integrates a PET foam sheet that will become the release sheet 5 and an acrylic foam that will become the adsorbent 3 is attached to the back side of the wooden substrate 2. Therefore, unlike when the adsorbent is provided on the wooden substrate before the decorative material, and then the decorative material is provided on the wooden substrate, the acrylic foam is pressed against the MDF, for example by a roll press, only once, thereby reducing crushing of the adsorbent 3.

[0049] Then, MDF (in the case of the above-mentioned size, for example, 3 feet wide x 6 feet wide) with an olefin sheet attached to its front side and an adhesive sheet attached to its back side is cut into smaller pieces.

[0050] Thereafter, the MDF cut into small pieces is cut to the product size (for example, 150 mm×900 mm), and, if necessary, the corners on the front surface on which the decorative material 4 is provided are chamfered.

[0051] In this manner, a wooden flooring material 1 having a product size is manufactured. The manufactured wooden flooring material 1 has a decorative material 4, a wooden base material 2, an adsorbent material 3, and a release sheet 5 laminated in this order from the surface side.

[0052] Next, a method for installing the wooden flooring 1 according to this embodiment will be described. First, dirt and dust are removed from the surface of the floor on which the wooden flooring 1 is to be laid. Then, the release sheet 5 attached to the back surface of the wooden flooring 1 to be laid is peeled off to expose the adsorption surface of the adsorbent 3. After that, the wooden flooring 1 with the exposed adsorbent 3 is placed on the floor surface, and the wooden flooring 1 is attached while pressing from the front side of the wooden flooring 1. At this time, the hollow structure of the foam of the adsorbent 3 is crushed, and the wooden flooring 1 is not likely to sink further in the height direction. Also, no excess portion that does not perform the adsorption function is created in the thickness direction of the adsorbent 3.

[0053] Next, the release sheet 5 attached to the back surface of another wooden flooring material 1 is peeled off, and a new wooden flooring material 1 with the adsorbent material 3 exposed is placed and attached on the floor underlayment or on the existing wooden flooring material 1 next to the already placed wooden flooring material 1. At this time, the new wooden flooring material 1 is placed so that the ends of the previously laid wooden flooring material 1 and the ends of the wooden flooring material 1 to be laid adjacent to it face each other and are butted up against each other.

[0054] When installing the wooden flooring 1 along a wall or the like, the wooden flooring 1 is cut into the desired shape with a tool such as a cutter. When cutting with a cutter, it is preferable to make multiple cuts from the decorative material 4 side and the adsorbent 3 side of the wooden flooring 1.

[0055] In order to enhance the adsorption properties of the adsorbent 3, it is desirable that the floor on which the wooden flooring 1 is to be laid should have a smooth surface. It is not limited to laying the wooden flooring 1 directly on the flooring material, but the surface may be made smooth by applying synthetic resin or attaching a synthetic resin sheet onto a floor underlayment or an existing flooring material.

[0056] Next, a method for testing the adsorptive power of the adsorbent 3 provided on the wooden flooring material 1 according to this embodiment will be described with reference to FIG.

[0057] The adsorptive power exerted by the adsorbent 3 was measured using a test method that conforms to the flat tensile test of the Japanese Agricultural Standards (JAS) for plywood. In the test, the exposed surface of the adsorbent 3 to be measured was attached to the adherend 21. For the adherend 21, a SUS304BA steel plate was used, which is used as an adherend in JIS Z 0237 (Test method for adhesive tapes and adhesive sheets).

[0058] During testing, the adherend 21 is placed in the lower chuck 23. The decorative material 4 side (olefin sheet side) of the surface of the wooden flooring material 1, which is a 20 mm x 20 mm test specimen, is adhered to a special jig 22 with a cyanoacrylate adhesive, and the special jig 22 is engaged with the upper chuck 24. Measurement is started with the adsorbent 3 of the wooden flooring material 1, which is the test specimen, in close contact with the adherend 21, and the upper chuck 24 is raised at a load of 5880 N or less per minute while the lower chuck 23 is fixed. The maximum load value measured when the wooden flooring material 1 peels off from the adherend 21 is recorded as the adsorption force of the adsorbent 3.

[0059] Next, the release sheet 5 according to this embodiment will be described in detail. The release sheet 5 is preferably made of a synthetic resin foam, such as a polyethylene terephthalate resin foam. By using a sheet-shaped polyethylene terephthalate resin foam (foamed PET sheet) for the release sheet 5, the surface (adsorption surface) of the adsorbent 3 can be kept smooth during storage or transportation after production as the wooden flooring material 1, and the substantial area of ​​contact between the floor surface and the adsorption surface of the adsorbent 3 when the wooden flooring material 1 is laid can be reliably secured. As a result, the wooden flooring material 1 can exhibit the desired adsorption performance, and the wooden flooring material 1 is less likely to peel off from the floor surface.

[0060] It is also possible to use paper, which is commonly used, as the material for the release sheet applied to the adsorbent 3. Paper release sheets have a relatively weak adhesive force to the adsorbent 3. Therefore, paper release sheets are easily affected by the movement of the adsorbent 3 attached to the wooden base material 2 that occurs during the manufacturing process. That is, while the adsorbent 3 in the wooden flooring material 1 maintains its thickness within a specified range, the adsorbent 3, which is an acrylic foam resin body with a thickness of about 0.3 mm, is flexible and moves slightly due to vibration, etc.

[0061] When the adsorbent 3 moves, in the area where the degree of adhesion between the paper release sheet and the adsorbent 3 is low, the paper release sheet shifts and wrinkles are formed in a corrugated cross section. As a result, the wrinkled shape of the release sheet is transferred to the adsorbent 3, and the adsorbent surface of the adsorbent 3 is not smooth, but remains fixed in a wrinkled shape. Since the wrinkles formed in the adsorbent 3 have recessed parts, there are areas where the adsorbent 3 does not contact the floor surface, and the adsorbent cannot exert sufficient adsorption power during construction. In response to this, by making the release sheet 5 a sheet-shaped synthetic resin foam, for example a foamed PET sheet, it is possible to prevent the release sheet 5 from shifting and maintain the adsorbent surface of the adsorbent 3 as a smooth surface.

[0062] It is also possible to use a polyethylene terephthalate resin sheet (simple PET sheet) that is not a foam as the material of the release sheet applied to the adsorbent 3. However, a simple PET sheet has a property that it is less likely to bend than a foamed PET sheet.

[0063] As described above, the manufacturing process for the wooden flooring 1 includes a step of cutting the wooden flooring 1 to the product size with the release sheet 5 attached. Figures 3 and 4 show the state in which the wooden flooring 1 is cut by a blade 31 attached to a woodworking machine 30. If the release sheet is a PET sheet, when the wooden flooring 1 is cut, the rotation of the blade 31 may cause the PET sheet to crack from the cut part to the inner plane, or it may float away from the adsorbent 3 as shown in Figure 4. This causes a problem in which wood powder gets mixed in between the adsorbent 3 and the PET release sheet. The same problem may occur when chamfering the corners of the wooden flooring 1.

[0064] Therefore, the release sheet 5 according to this embodiment has a specific gravity of 1.0 g / cm 3 By using foamed PET sheets on the front and back, it is possible to use a simple PET sheet (specific gravity is 1.4g / cm 3 This makes it easier to cut and reduces the risk of problems such as the release sheet 5 cracking or lifting off the adsorbent 3 when cutting the wooden flooring 1 into the desired shape.

[0065] The release sheet 5 is a sheet-shaped synthetic resin foam, and may be made of a material other than PET as long as the release sheet 5 does not crack or float from the adhesive layer. For example, the release sheet 5 may be a foam of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), or the like.

[0066] The specific gravity of the release sheet 5 is 0.9 g / cm 3 More than 1.1g / cm 3 A specific gravity of 0.9 g / cm or less is preferable. 3 or less than 1.1 g / cm 3 If the specific gravity exceeds 0.9 g / cm, the cut portion of the release sheet is likely to crack when the wooden flooring material 1 is cut. 3 If the specific gravity is less than 1.1 g / cm, the sheet-shaped synthetic resin foam becomes brittle as the specific gravity decreases, and the durability is low and it is prone to cracking. 3If it exceeds this value, the higher the specific gravity, the harder it becomes to bend, so the reaction force when it comes into contact with the blade 31 becomes stronger and it becomes more likely to break.

[0067] The thickness of the release sheet 5 is, for example, 0.05 mm (50 μm), and preferably 0.03 to 0.07 mm. If the thickness is less than 0.03 mm or more than 0.07 mm, the cut portion of the release sheet is likely to crack when cutting the wooden flooring 1. If the thickness is less than 0.03 mm, the thinner the sheet-shaped synthetic resin foam, the easier it is for the blade 31 to pass through, and the lower the durability, the more likely it is to crack. If the thickness exceeds 0.07 mm, the thicker the sheet-shaped synthetic resin foam, the harder it is to bend, and the stronger the reaction force when it comes into contact with the blade 31, making it more likely to crack.

[0068] The effects and advantages of the wood flooring material 1 according to this embodiment will be described below. The existing floor is almost smooth, but there are cases where unevenness occurs due to the formation of concaves and convexes during use, or where the ends of the existing wooden flooring 1 are pushed up against each other due to the contraction and expansion of the wooden substrate, resulting in unevenness that forms a convex portion. Since the total thickness (total thickness) of the wooden substrate 2 and the adsorbent 3 of the wooden flooring 1 according to this embodiment is 1.7 mm to 3.5 mm, if the unevenness is about 1 mm or less in height, the wooden flooring 1 can be attached and installed without peeling. In addition, in order to make the wooden flooring 1 less likely to peel off, it is desirable that the position of the unevenness is not at the end of the wooden flooring 1 but on the inner side of the plane. In addition, compared to the total thickness of conventional flooring for renovation, which is 4 mm to 6 mm, the wooden flooring 1 according to this embodiment has a relatively thin total thickness, so it is easy to fit within the clearance under the fittings.

[0069] In the wood flooring material 1 of this embodiment, no shock absorbing layer such as a cushioning material made of synthetic resin foam is placed between the wood base material 2 and the adsorbent material 3, but the thickness of the wood base material 2 is 1.5 mm or more and 3.0 mm or less, which ensures the rigidity of the wood flooring material 1 while not being too rigid, allowing the wood flooring material 1 to adapt to small unevenness.

[0070] The adsorbent 3 is directly bonded to the back side of the wood substrate 2, and the adsorption force of the adsorbent 3 measured in a flat tensile test is 0.045 N / mm 2 More than 0.075N / mm 2 As a result, the adhesive performance can be ensured for floors with relatively small unevenness, and since the adhesive does not have a relatively high adhesive force, it is easy to apply even for people such as residents who have little experience in applying interior building materials.

[0071] Furthermore, since the thickness of the adsorbent 3 is 0.2 mm to 0.5 mm, unevenness can be absorbed by the adsorbent 3 alone, even if a shock absorbing layer such as a cushioning material is not provided. And since there is no excess part in the thickness direction of the adsorbent 3 that does not exert its adsorption function, the adsorbent 3 itself does not have cushioning properties, and the adsorbent 3 does not sink when a load is applied by the legs or casters of a chair. Therefore, when the legs or casters of a chair are dragged, the legs or casters do not come into contact with the end of the wood base material 2, and the problem of the wood flooring 1 being chipped can be eliminated or reduced.

[0072] In this embodiment, because the release sheet 5 is a synthetic resin foam, for example a foamed PET sheet, when the thickness of the adsorbent 3 is 0.2 mm or more and 0.5 mm or less, the release sheet is more likely to adhere to the adsorbent 3, unlike paper or synthetic resin sheets that are not foams. Furthermore, when the wood flooring 1 is cut into the desired shape, problems such as the release sheet 5 cracking or lifting from the adhesive layer are less likely to occur. [Explanation of symbols]

[0073] 1,50 :Wood flooring 2,51: Wood base material 3,53: Adsorbent (adhesive layer) 4,54: Decorative materials 5,55: Release sheet 21: Adherent 22: Dedicated jig 23: Lower chuck 24: Upper chuck 30: Woodworking machines 31: Blade 52: Cushioning material

Claims

1. A wood base material; A decorative material provided on the surface side of the wood base material; An adhesive layer directly bonded to the back side of the wood base material; Equipped with The thickness of the wood base material is 1.5 mm or more and 3.0 mm or less, The thickness of the adhesive layer is 0.2 mm or more and 0.5 mm or less, The adhesive strength of the adhesive layer in a flat tensile test is 0.045 N / mm ２ 0.075N / mm or more ２ The following are wood flooring materials:

2. Further comprising a release sheet provided on the surface of the adhesive layer opposite to the wood substrate, 2. The wooden flooring material according to claim 1, wherein the release sheet is a synthetic resin foam.

3. The specific gravity of the release sheet is 0.9 g / cm ３ 1.1g / cm or more ３ 3. The wood flooring material according to claim 2, wherein:

4. 4. The wooden flooring material according to claim 2 or 3, wherein the thickness of the release sheet is 0.03 mm or more and 0.07 mm or less.

5. The bending rigidity of the wood base material is 15×10 ４ N mm ２ Above 150 x 10 ４ N mm ２ The wood flooring material according to any one of claims 1 to 4, wherein:

6. A step of providing a decorative material on a surface side of a wood substrate having a thickness of 1.5 mm or more and 3.0 mm or less; A step of providing an adhesion layer having a thickness of 0.2 mm or more and 0.5 mm or less on the back side of the wood base material on which the decorative material is provided; Cutting the wood base material on which the adhesive layer is provided; having The adhesive strength of the adhesive layer in a flat tensile test is 0.045 N / mm ２ 0.075N / mm or more ２ A method for manufacturing a wooden flooring material, comprising:

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