Decorative material

Abstract

To provide a decorative material capable of mitigating impact on a user's head upon overturn and fall from a bed so as to avoid fatal damage when used as a floor material, being configured to allow recycling while taking environmental load into consideration.SOLUTION: A decorative material 1 is provided with: a wooden base material 10; a cushion material 20 attached on a rear surface of the wooden base material 10; and a decorative layer 30 arranged on a front surface of the wooden base material 10. The cushion material 20 is composed of wooden fiber plates, and the decorative material 1 is configured to have a head injury criterion value (HIC value) of 1000, where a drop height is 60 cm or more, measured through an impact test in accordance with ASTM F 1292.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a decorative material for indoor use, which takes into consideration safety in the event of a fall or tipping over. [Background technology]

[0002] In the past, falls among elderly people and injuries such as fractures have been a problem, and flooring materials have been proposed that reduce the risk of fractures by absorbing the impact of falls (see, for example, Patent Document 1 below).

[0003] Patent Document 1 discloses a flooring material that is equipped with an impact absorbing material made of synthetic resin foam or rubber foam, so that the maximum acceleration (G value) measured using the JIS A6519 measurement method is 80G or less. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-190672 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there have been many fatal accidents involving elderly people falling over or out of bed. For this reason, there is a demand for flooring materials that can mitigate the large impacts to the head that can lead to fatal injuries when people fall over or fall down.

[0006] However, the G-value used as an index of shock mitigation performance in conventional flooring materials is the measurement of the acceleration when a head model is allowed to freely fall from a height of 20 cm and hits the flooring material. However, in actual falls, the head may fall from a height higher than 20 cm. Therefore, even if the G-value is within the appropriate range, it was unclear whether the impact received by the head and flooring material during actual falls or trips could be adequately mitigated.

[0007] In addition, conventional flooring materials use resin foams, which have a high environmental impact, as shock absorbing materials, and therefore may have a negative impact on environmental issues such as global warming and marine microplastics. Furthermore, conventional flooring materials have a problem in that they lack recyclability because the resin foams are bonded to the wood substrate with an adhesive.

[0008] The present invention has been made in consideration of the above points, and its purpose is to provide a decorative material that, when used as a flooring material, can cushion the impact so as not to cause fatal injury to the head when a person trips or falls from a bed, and is recyclable while taking into consideration the burden on the environment. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, in the present invention, a wood fiberboard is used as a cushioning material, and a decorative material is constructed so that the fall height (danger height) at which the head injury criterion value (HIC value) is 1000 as measured by an impact test conforming to ASTM standard F1292 is 60 cm or more.

[0010] Specifically, the first invention is a decorative material comprising a wooden base material, a cushioning material adhered to the back surface of the wooden base material, and a decorative layer provided on the surface of the wooden base material, wherein the cushioning material is a wood fiberboard and is configured so that the drop height at which a head injury criterion (HIC value) of 1000 is achieved as measured by an impact test conforming to ASTM standard F1292 is 60 cm or more.

[0011] Here, "impact test in accordance with ASTM standard F1292" refers to an impact test stipulated in the "Standard for Impact Attenuation of Surface Materials Used in the Use Area of ​​Playground Equipment" established by the American Society for Testing and Materials (ASTM), in which a head model equipped with a built-in 3-axis acceleration sensor is allowed to freely fall onto the decorative material, and the Head Injury Criterion (HIC) value calculated from the maximum acceleration (Gmax) at the time of impact, the average acceleration of the impact on the head at the time of impact, and the decay time (time during which the impact is received) is used as an index for evaluating the impact on the head.

[0012] The above-mentioned ASTM standard F1292 indicates an evaluation criterion that a head injury criteria value (HIC value) exceeding 1000 poses a high risk of causing fatal head injury.

[0013] Incidentally, when a person falls and puts their hands on the floor, the height of the head from the floor is about 60 cm, and the height of the bed is about 60 cm for a high bed. Therefore, in order to prevent fatal damage to the head when the person falls or falls from the bed, it is required to use a decorative material for the flooring that has a head injury criterion value (HIC value) of 1000 or less when the head model is allowed to freely fall from a height of 60 cm and crash in an impact test based on the ASTM standard F1292.

[0014] Therefore, in the first invention, the decorative material is configured so that the fall height at which the head injury criterion (HIC value) measured by an impact test conforming to ASTM standard F1292 is 1000 is 60 cm or more. If such a decorative material is used as a flooring material, when the head strikes the flooring material from a height of 60 cm, the head injury criterion (HIC value) will always be 1000 or less. In other words, according to the decorative material, when used as a flooring material, it is possible to absorb the impact so as not to cause fatal injury to the head when a person falls over or falls off a bed.

[0015] In addition, in the first invention, instead of using resin foam, which has a high environmental impact, as in conventional flooring materials, wood fiber boards are used as cushioning materials. This configuration can increase the usage rate of wood materials and promote the elimination of plastics. In addition, by using wood fiber boards instead of conventional resin foams, recycling is easier than conventional flooring materials, and recyclability can be improved.

[0016] As described above, according to the first invention, a decorative material that, when used as flooring, cushions the impact to prevent fatal injury to the head in the event of a trip or fall from a bed can be configured to be recyclable with consideration for the environmental impact.

[0017] Incidentally, wood fiber boards are not only excellent in shock absorption performance but also in heat insulation, so the decorative material according to the first aspect of the invention, which includes wood fiber boards, can keep the room in which it is installed at a comfortable temperature without being affected by the outside air temperature.

[0018] In addition, wood fiber boards have excellent vibration absorption properties, so if the decorative material according to the first aspect of the present invention comprising wood fiber boards is used as a flooring material, vibrations on the floor are less likely to be transmitted to the floor below, and floor impact noise transmitted to the floor below can be reduced.

[0019] Furthermore, wood fiber boards have excellent moisture absorption properties, so the decorative material according to the first aspect of the invention, which includes wood fiber boards, can maintain a comfortable humidity level in the room where it is applied, without being affected by the humidity of the outside air.

[0020] The second invention is characterized in that, in the first invention, the wood base material has a thickness of 6 mm or more and 12 mm or less, and the cushioning material is an insulation board having a thickness of 12 mm or more and 18 mm or less.

[0021] The inventors of the present application produced several decorative materials with a wooden base material having a thickness of 6 mm to 12 mm and an insulation board having a thickness of 12 mm to 18 mm as a cushioning material, and conducted impact tests in accordance with ASTM standard F1292. As a result, the fall height (dangerous height) at which the head injury criterion value (HIC value) was 1000 for all of the decorative materials was 60 cm or more.

[0022] As described above, according to the second invention, by simply using a cushioning material consisting of a wooden base material of a predetermined thickness and an insulation board of a predetermined thickness, it is possible to easily construct a decorative material that, when used as a flooring material, can absorb impacts to prevent fatal injury to the head in the event of a trip or fall from the bed.

[0023] A third invention is characterized in that in the second invention, a surface of the cushioning material is formed with a plurality of linear grooves extending parallel to each other.

[0024] In the third invention, a plurality of linear grooves extending parallel to each other are formed on the surface of the cushioning material, so that the cushioning material is more likely to bend when an impact is applied to the decorative material. Therefore, according to the third invention, the shock absorbing performance of the decorative material can be easily improved by simply forming a plurality of grooves on the surface of the cushioning material.

[0025] The fourth invention is characterized in that, in the second invention, a plurality of linear voids extending parallel to each other in a direction perpendicular to the thickness direction are formed inside the cushioning material.

[0026] In the fourth aspect of the invention, a plurality of linear voids extending parallel to each other in a direction perpendicular to the thickness direction are formed inside the cushioning material, so that the cushioning material is more likely to bend when an impact is applied to the decorative material. Therefore, according to the fourth aspect of the invention, the impact absorbing performance of the decorative material can be easily improved by simply forming a plurality of voids inside the cushioning material.

[0027] A fifth invention is characterized in that in any one of the first to fourth inventions, the decorative layer is a resin sheet.

[0028] In the fifth aspect of the invention, the decorative layer is made of a resin sheet, so that when an impact is applied to the decorative material, the impact acting on the wood base material can be mitigated. Therefore, according to the fifth aspect of the invention, when an impact is applied to the decorative material, the wood base material can be prevented from breaking. Effect of the Invention

[0029] As described above, according to the present invention, wood fiberboard is used as a cushioning material, and the decorative material is configured so that the fall height (danger height) at which the head injury criterion (HIC value) is 1000 as measured by an impact test conforming to ASTM standard F1292 is 60 cm or more.Therefore, when used as a flooring material, the decorative material can absorb impact to prevent fatal injury to the head in the event of a fall or tripping over a bed, and can be configured to be recyclable with consideration for the environmental impact. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a cross-sectional view showing a part of a decorative material according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a table showing the results of the impact test in the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing a portion of a decorative material according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view showing a portion of a decorative material according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its uses.

[0032] First Embodiment of the Invention Fig. 1 shows a decorative material 1 according to embodiment 1 of the present invention. In this embodiment 1, an example will be described in which the decorative material 1 is used as a flooring material indoors in buildings such as houses, schools, and elderly care facilities. When used as a flooring material, the decorative material 1 is applied on a floor underlay material.

[0033] -Composition of decorative materials- The decorative material 1 comprises a wooden substrate 10, a cushioning material 20, and a decorative layer 30. The cushioning material 20 is provided on the back side of the wooden substrate 10, and the decorative layer 30 is provided on the front side of the wooden substrate 10. The decorative material 1 is formed by laminating the decorative layer 30, the wooden substrate 10, and the cushioning material 20 in this order, and bonding them together with an adhesive.

[0034] Although not shown in the drawings, in this embodiment 1 in which the decorative material 1 is used as a flooring material, the decorative material 1 is configured as a long and narrow plate material, and on one side surface facing in the width direction, a female part consisting of a concave strip extending in the length direction is formed, and on the other side surface, a male part consisting of a convex strip extending in the length direction that fits into the female part is formed. Also, on one side surface facing in the length direction of the decorative material 1, a female part consisting of a concave strip extending in the width direction is formed, and on the other side surface, a male part consisting of a convex strip extending in the width direction that fits into the female part is formed.

[0035] (wood base material) The wood base material 10 has a density of 0.3 g / cm 3 More than 0.8g / cm 3 The wooden substrate 10 is made of a wood board having a diameter of 6 mm or less and a thickness of 6 mm or more and 12 mm or less. Wood boards such as wood plywood, medium density fiberboard (MDF), particle board (PB), etc. can be used for the wooden substrate 10. The wooden substrate 10 can also be made of a wood composite material in which multiple types of wood boards (for example, wood plywood and medium density fiberboard, or medium density fiberboard and particle board, etc.) are laminated and integrated with an adhesive. When the wooden substrate 10 is made of a wood composite material, it is preferable that the density of the wood composite material is 0.3 g / cm or less. 3 More than 0.8g / cm 3 It is constructed using the following types of wood boards so that the thickness is between 6mm and 12mm.

[0036] (buffer material) The cushioning material 20 is made of a wood fiber board. In the present embodiment, the cushioning material 20 has a density of 0.22 g / cm 3 More than 0.31g / cm 3 The cushioning material 20 is made of an insulation board having a thickness of 12 mm to 18 mm. The cushioning material 20 is adhered to the back surface of the wood base material 10 (the lower surface in FIG. 1) with an adhesive.

[0037] (Decorative layer) The decorative layer 30 is composed of a general decorative material such as veneer or decorative sheet, or a coating film. In this embodiment 1, the decorative layer 30 is formed of a resin sheet such as an olefin resin having a thickness of about 150 μm. For example, wood grain or stone grain is printed on the decorative layer 30. The decorative layer 30 is adhered to the surface of the wood base material 10 (the upper surface in FIG. 1) by an adhesive. The resin sheet constituting the decorative layer 30 is preferably flexible, and for example, an olefin resin, a vinyl chloride resin, a urethane resin, a synthetic rubber resin, a polyester resin, or the like can be used.

[0038] -Shock mitigation performance of decorative materials- The decorative material 1 is configured to cushion the impact so as not to cause fatal damage to the head even if the head strikes the decorative material 1 as a flooring material when a person falls or falls off a bed. Specifically, in this embodiment 1, the thickness of the wood base material 10 is set to 6 mm or more and 12 mm or less, and the cushioning material 20 is configured as an insulation board having a thickness of 12 mm or more and 18 mm or less, so that the decorative material 1 is configured so that the fall height (dangerous height) at which the head injury criterion value (HIC value) is 1000 measured by an impact test conforming to ASTM standard F1292 is 60 cm or more.

[0039] Note that here, "impact test in accordance with ASTM standard F1292" refers to an impact test stipulated in the "Standard for Impact Attenuation of Surface Materials Used in the Use Area of ​​Playground Equipment" established by the American Society for Testing and Materials (ASTM), in which a head model equipped with a built-in 3-axis acceleration sensor is allowed to freely fall onto the decorative material, and the Head Injury Criterion (HIC) value calculated from the maximum acceleration (Gmax) at the time of impact, the average acceleration applied to the head at the time of impact, and the decay time (time during which the impact is received) is used as an index for evaluating the impact on the head.

[0040] The above-mentioned ASTM standard F1292 indicates an evaluation criterion that a head injury criteria value (HIC value) exceeding 1000 poses a high risk of causing fatal head injury.

[0041] Incidentally, when a person falls and puts their hands on the floor, the height of the head from the floor is about 60 cm, and the height of the bed is about 60 cm for a high bed. Therefore, in order to prevent fatal damage to the head when the person falls or falls from the bed, it is required to use a decorative material for the flooring that has a head injury criterion value (HIC value) of 1000 or less when the head model is allowed to freely fall from a height of 60 cm and crash in an impact test based on the ASTM standard F1292.

[0042] Therefore, in the present embodiment 1, as described above, the thickness of the wooden base material 10 is set to 6 mm or more and 12 mm or less, and the cushioning material 20 is made of an insulation board having a thickness of 12 mm or more and 18 mm or less, so that the decorative material 1 is configured to have a fall height (dangerous height) of 60 cm or more at which the head injury criterion (HIC value) measured by an impact test conforming to ASTM standard F1292 is 1000. By configuring the decorative material 1 in this way, even if the head hits the decorative material 1 as a floor material when falling over or falling from a bed, the decorative material 1 absorbs and reduces the impact, so that the head injury criterion (HIC value) is 1000 or less and no fatal damage is caused to the head.

[0043] The insulation board is a wood board, which is harder than the resin foam conventionally used as a cushioning material, but has a low density among wood boards and a spring constant suitable for shock absorption. In the present embodiment 1, such an insulation board is used as the cushioning material 20, and is formed to be thicker (12 mm to 18 mm thick) than conventional cushioning materials. With this configuration, when an impact is applied to the decorative material 1, the cushioning material 20 is sufficiently compressed and deformed without bottoming out, so that the impact at the time of collision can be sufficiently absorbed and mitigated.

[0044] If the insulation board constituting the cushioning material 20 is too thick, the bending deformation (deflection) of the cushioning material 20 during shock absorption becomes too large, and the wood base material 10 laminated on the surface of the cushioning material 20 (the upper surface in FIG. 1) cannot keep up with the large bending deformation of the cushioning material 20, and may break. Therefore, in this embodiment 1, the thickness of the insulation board is set to 12 mm or more, which is thicker than the cushioning materials of conventional flooring materials, but is set to 18 mm or less to prevent it from becoming too thick.

[0045] Also, if the wooden substrate 10 is too thin, the bending strength and shear strength of the wooden substrate 10 are low, so that the wooden substrate 10 cannot follow the bending deformation of the buffer material 20 during shock absorption, and may break. On the other hand, if the wooden substrate 10 is too thick, the rigidity of the wooden substrate 10 becomes too high, so that the kinetic energy of the collision is not easily transmitted to the buffer material 20, and the shock mitigation performance is reduced. Therefore, in order to improve the shock mitigation performance, it is necessary to increase the thickness of the buffer material 20 provided below the wooden substrate 10, and the thickness of the entire decorative material 1 becomes thick. In such a case, for example, a special design change including an adjustment of the height of the floor underlayment from GL (ground) is required, which is not preferable. Therefore, in this embodiment 1, the thickness of the wooden substrate 10 is set to 6 mm or more and 12 mm or less.

[0046] As described above, in the decorative material 1, the thickness of the wood base material 10 is set to be 6 mm or more and 12 mm or less, and the cushioning material 20 is constructed of an insulation board having a thickness of 12 mm or more and 18 mm or less, so that the decorative material 1 is configured so that the fall height (danger height) at which the head injury criterion value (HIC value) is 1000 as measured by an impact test in accordance with ASTM standard F1292 is 60 cm or more.

[0047] <Impact test> In order to verify the above points, the following impact test was carried out.

[0048] (1) Test specimen Similar to the decorative material 1 of the first embodiment, specimens 1 to 13 were prepared, each measuring approximately 900 mm x 900 mm and including a wooden substrate, a buffer material, and a decorative layer. Specimens 1 to 13 differ in either the type of wooden substrate, the thickness of the wooden substrate, or the density or thickness of the buffer material. The type of buffer material was an insulation board, and the decorative layer was the same resin sheet. <Test specimen 1> Wood substrate: 6mm thick plywood Cushioning material: Density 0.22g / cm 3 , 12mm thick insulation board <Test specimen 2> Wood substrate: 9mm thick plywood Cushioning material: Density 0.22g / cm 3 , 12mm thick insulation board <Test specimen 3> Wood substrate: 9mm thick plywood Cushioning material: Density 0.22g / cm 3 , 15mm thick insulation board <Test specimen 4> Wood substrate: 9mm thick plywood Cushioning material: Density 0.31g / cm 3 , 12mm thick insulation board <Test specimen 5> Wood substrate: 12mm thick wood plywood Cushioning material: Density 0.22g / cm 3, 12mm thick insulation board <Test specimen 6> Wood substrate: 12mm thick wood plywood Cushioning material: Density 0.31g / cm 3 , 12mm thick insulation board <Test specimen 7> Wood base material: 6mm thick medium density fiberboard (MDF) Cushioning material: Density 0.22g / cm 3 , 12mm thick insulation board <Test specimen 8> Wood base material: 9mm thick medium density fiberboard (MDF) Cushioning material: Density 0.22g / cm 3 , 12mm thick insulation board <Test specimen 9> Wood base material: 9mm thick medium density fiberboard (MDF) Cushioning material: Density 0.22g / cm 3 , 15mm thick insulation board <Test specimen 10> Wood base material: 9mm thick medium density fiberboard (MDF) Cushioning material: Density 0.31g / cm 3 , 12mm thick insulation board <Test specimen 11> Wood base material: 9mm thick particle board (PB) Cushioning material: Density 0.22g / cm 3 , 12mm thick insulation board <Test specimen 12> Wood base material: 9mm thick particle board (PB) Cushioning material: Density 0.22g / cm 3 , 15mm thick insulation board <Test specimen 13> Wood base material: 9mm thick particle board (PB) Cushioning material: Density 0.31g / cm 3 , 12mm thick insulation board

[0049] (2) Test method A 4.15 kg head model with a built-in 3-axis acceleration sensor conforming to ASTM standard F1292 is dropped freely onto test specimens 1 to 13 multiple times while changing the height, and the drop height and the maximum acceleration (Gmax) at the time of impact are measured, and the Head Injury Criterion (HIC) value is calculated from the average acceleration of the impact on the head at the time of impact and the decay time (time during which the impact is received). From the multiple measured and calculated values, two drop heights at which the head injury criterion (HIC value) is 1000 or less and two drop heights at which the head injury criterion (HIC value) is over 1000 are extracted, and the drop height (dangerous height) at which the head injury criterion (HIC value) is 1000 is calculated from the regression curve obtained by performing regression analysis on the drop heights and head injury criterion (HIC value) of the above four points.

[0050] (3) Test results Figure 2 is a table showing the results of the impact test. As shown in the table in Figure 2, the danger height (the fall height at which the head injury criterion (HIC value) is 1000) was 60 cm or more for all test specimens 1 to 13. In other words, it was demonstrated that in the decorative material 1, when the thickness of the wood base material 10 is set to 6 mm or more and 12 mm or less, and the cushioning material 20 is made of an insulation board with a thickness of 12 mm or more and 18 mm or less, the danger height is configured to be 60 cm or more.

[0051] Furthermore, the above results show that the lower the density of the cushioning material 20 and the thicker the cushioning material 20, the higher the danger height, i.e., the higher the shock mitigation performance. The above results also show that a thickness of about 9 mm for the wood base material 10 is preferable because it increases the danger height (improves shock mitigation performance).

[0052] In addition, to compare with the results of test specimens 1 to 13, the above impact tests were performed on a general flooring material without cushioning material 20, in which the wooden base material 10 was made of 12 mm thick plywood (Comparative Example 1), a flooring material in which the wooden base material 10 was made of 12 mm thick plywood and the cushioning material 20 was made of 5 mm / 6 mm thick resin foam (Comparative Example 2 / Comparative Example 3), and a flooring material in which the wooden base material 10 was made of 9 mm thick medium-density fiberboard (MDF) and the cushioning material 20 was made of 4 mm thick resin foam (Comparative Example 4).The danger heights for Comparative Examples 1 to 4 were 36 cm, 57 cm, 52 cm, and 36 cm, all of which were less than 60 cm.

[0053] -Effects of embodiment 1- In the present embodiment 1, the decorative material 1 is configured so that the fall height (dangerous height) at which the head injury criterion (HIC value) measured by an impact test conforming to ASTM standard F1292 is 1000 is 60 cm or more. If such a decorative material 1 is used as a flooring material, when the head strikes the flooring material from a height of 60 cm, the head injury criterion (HIC value) is always 1000 or less. In other words, according to the decorative material 1, when used as a flooring material, it is possible to absorb the impact so as not to cause fatal damage to the head when a person falls over or falls off a bed.

[0054] Moreover, in the first embodiment, instead of using resin foam, which has a high environmental impact, as the cushioning material 20 as in conventional flooring materials, a wood fiber board (insulation board) is used as the cushioning material 20. With this configuration, it is possible to increase the usage rate of wood materials and to eliminate the use of plastic. Furthermore, by using wood fiber board instead of conventional resin foam, recycling is easier than conventional flooring materials, and recyclability can be improved.

[0055] As described above, according to this embodiment 1, the cosmetic material 1, which, when used as a flooring material, cushions the impact so as to prevent fatal injury to the head in the event of a fall or tripping over a bed, can be configured to be recyclable with consideration for the environmental impact.

[0056] Incidentally, wood fiber boards are excellent not only in shock absorption performance but also in heat insulation performance, so the decorative material 1 according to the present embodiment 1, which includes wood fiber boards, can keep the room where it is installed at a comfortable temperature without being affected by the outside air temperature.

[0057] Furthermore, wood fiber boards have excellent vibration absorption properties, so if the decorative material 1 according to the first embodiment, which includes wood fiber boards, is used as a flooring material, vibrations on the floor are less likely to be transmitted to the floor below, and floor impact noise transmitted to the floor below can be reduced.

[0058] Furthermore, wood fiber boards have excellent moisture absorption properties, so the decorative material 1 according to the first embodiment, which includes a wood fiber board, can maintain a comfortable humidity level in the room where it is applied, without being affected by the humidity of the outside air.

[0059] The inventors of the present application have also confirmed through impact testing that the decorative material 1 is configured such that the thickness of the wooden base material 10 is 6 mm to 12 mm and the cushioning material 20 is an insulation board having a thickness of 12 mm to 18 mm, so that the decorative material 1 is configured such that the fall height (dangerous height) at which the head injury criterion (HIC value) is 1000 measured by an impact test conforming to ASTM standard F1292 is 60 cm or more. In the present embodiment 1, the thickness of the wooden base material 10 is 6 mm to 12 mm and the cushioning material 20 is an insulation board having a thickness of 12 mm to 18 mm. Therefore, according to the present embodiment 1, by simply using the wooden base material 10 of a predetermined thickness and the cushioning material 20 made of an insulation board having a predetermined thickness, it is possible to easily configure the decorative material 1 that can absorb impacts so as not to cause fatal damage to the head when used as a flooring material when the user falls over or falls off the bed.

[0060] Furthermore, in the first embodiment, the decorative layer 30 is made of a resin sheet, which can reduce the impact acting on the wood base material 10 when an impact is applied to the decorative material 1. Therefore, according to the first embodiment, when an impact is applied to the decorative material 1, it is possible to prevent the wood base material 10 from breaking.

[0061] Second Embodiment of the Invention In the second embodiment, the configuration of the cushioning material 20 in the first embodiment is partially modified. Specifically, as shown in Fig. 3, a plurality of linear grooves 21, ..., 21 extending parallel to each other are formed on the surface of the cushioning material 20 that contacts the lower surface of the wood base material 10 (the upper surface in Fig. 3).

[0062] The multiple grooves 21, ..., 21 have the same cross-sectional shape. In the second embodiment, the cross-sectional shape of the groove 21 is formed to be rectangular (width 32.5 mm, depth 7 mm), but the cross-sectional shape of the groove 21 is not limited to rectangular and may be any shape. The multiple grooves 21, ..., 21 are arranged at regular intervals (for example, 15 mm intervals). The multiple grooves 21, ..., 21 are formed to extend from one end to the other end of the cushioning material 20 in the longitudinal direction.

[0063] The wooden base material 10 is made of 12 mm thick wooden plywood, and the cushioning material 20 has a density of 0.22 g / cm 3 A test specimen 14 was fabricated using a 12 mm thick insulation board with a plurality of grooves 21, ..., 21 formed therein, and an impact test was conducted using the same test method as in embodiment 1. As a result, the danger height (the fall height at which the head injury criterion (HIC value) becomes 1000) of test specimen 14 was 89 cm. The danger height of test specimen 5 (without groove 21), which differs from test specimen 14 only in the presence or absence of groove 21, was 73 cm. Therefore, it is understood that by forming a plurality of grooves 21, ..., 21 on the surface of cushioning material 20, the danger height is dramatically increased, that is, the impact mitigation performance is dramatically improved.

[0064] As described above, according to the decorative material 1 of the second embodiment, a plurality of linear grooves 21, ..., 21 extending parallel to one another are formed on the surface of the cushioning material 20, so that the cushioning material 20 is more likely to bend when an impact is applied to the decorative material 1. Therefore, according to the second embodiment, the impact absorbing performance of the decorative material 1 can be easily improved by simply forming a plurality of grooves 21, ..., 21 on the surface of the cushioning material 20.

[0065] Third embodiment of the invention In the third embodiment, the configuration of the cushioning material 20 in the first embodiment is partially changed. Specifically, as shown in Fig. 4, a plurality of linear voids 22, ..., 22 extending parallel to each other in a direction perpendicular to the thickness direction are formed inside the cushioning material 20.

[0066] The multiple voids 22, ..., 22 have the same cross-sectional shape. In the third embodiment, the cross-sectional shape of the voids 22 is formed to be rectangular (width 32.5 mm, depth 7 mm), but the cross-sectional shape of the voids 22 is not limited to rectangular and may be any shape. The multiple voids 22, ..., 22 are arranged at regular intervals (for example, 15 mm intervals). The multiple voids 22, ..., 22 are formed to extend from one end to the other end of the cushioning material 20 in the longitudinal direction.

[0067] The wooden base material 10 is made of 12 mm thick wooden plywood, and the cushioning material 20 has a density of 0.22 g / cm 3 A test specimen 15 was fabricated, which was made of an 18 mm thick insulation board and had a plurality of voids 22, ..., 22 formed therein, and an impact test was conducted using the same test method as in embodiment 1. As a result, the danger height (the fall height at which the head injury criterion (HIC value) becomes 1000) of test specimen 15 was 96 cm. The danger height of test specimens 1 to 13 was the highest at 86 cm for test specimen 9, so it can be seen that by forming a plurality of voids 22, ..., 22 inside the cushioning material 20, the danger height is dramatically increased, that is, the impact mitigation performance is dramatically improved.

[0068] As described above, according to the decorative material 1 of the third embodiment, a plurality of linear voids 22, ..., 22 extending parallel to one another in a direction perpendicular to the thickness direction are formed inside the cushioning material 20, so that the cushioning material 20 is more likely to bend when an impact is applied to the decorative material 1. Therefore, according to the third embodiment, the impact absorbing performance of the decorative material 1 can be easily improved by simply forming a plurality of voids 22, ..., 22 inside the cushioning material 20.

[0069] Other Embodiments In the above first to third embodiments, the decorative material according to the present invention is used as a floor material, but the decorative material according to the present invention can also be used as a vertical material such as a wall material.

[0070] In addition, in the above first to third embodiments, the cushioning material 20 is made of an insulation board. However, the cushioning material 20 may be made of wood fiberboard, or may be made of medium density fiberboard (MDF) or the like.

[0071] Furthermore, in the decorative material according to the present invention, the thickness of the wooden base material 10 and the cushioning material 20 need not be the thickness shown in the embodiments 1 to 3, so long as the cushioning material 20 is made of wood fiberboard and the danger height (the fall height at which the head injury criterion (HIC value) measured by an impact test conforming to ASTM standard F1292 is 1000) is 60 cm or more. This is because, if the cushioning material 20 of the decorative material 1 is made of wood fiberboard and the danger height is 60 cm or more, the decorative material 1 can be configured to be recyclable in consideration of the environmental load when used as a flooring material and can absorb impact to prevent fatal damage to the head when the user falls or falls from the bed. [Industrial Applicability]

[0072] The present invention is useful for decorative materials for indoor use, which take into consideration safety in the event of a tripping over or falling. [Explanation of symbols]

[0073] 1. Cosmetic materials 10 Wood base material 20 Cushioning material 21 Groove 22 void 30 Makeup layer

Claims

1. A decorative material comprising a wood base material, a cushioning material adhered to the back surface of the wood base material, and a decorative layer provided on the surface of the wood base material, The cushioning material is a wood fiberboard. It is designed to have a drop height of 60 cm or more that results in a head injury criterion value (HIC value) of 1000, as measured by an impact test conforming to ASTM standard F1292. A cosmetic material characterized by the above.

2. The decorative material according to claim 1, The wood base material has a thickness of 6 mm or more and 12 mm or less, The cushioning material is an insulation board having a thickness of 12 mm to 18 mm. A cosmetic material characterized by the above.

3. The decorative material according to claim 2, A plurality of linear grooves extending parallel to each other are formed on the surface of the cushioning material. A cosmetic material characterized by the above.

4. The decorative material according to claim 2, The cushioning material has a plurality of linear voids formed therein, the linear voids extending parallel to each other in a direction perpendicular to the thickness direction. A cosmetic material characterized by the above.

5. The decorative material according to any one of claims 1 to 4, The decorative layer is a resin sheet. A cosmetic material characterized by the above.

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