Impact absorbing flooring material

Abstract

To realize a shock absorbing flooring material capable of delivering sufficient absorption performance while preventing a bottoming out even when relatively hard materials are used or thickness is limited.SOLUTION: A shock absorbing flooring material comprises a shock diffusing layer and a shock absorbing layer which is more flexible than the shock diffusing layer and is arranged overlapping the shock diffusing layer. The Asker C hardness of the shock absorbing layer is set to a value in the range of 10 or more and 40 or less. The shock diffusing layer is designed so that an area ratio of S2 / S1 exceeds 140%, when S1 is an area of a contact surface of an object on an upper surface when pressing force, which is the load derived from the acceleration G at the time of collision measured in a floor hardness test conforming to Item 9.6.1 of JIS A 6519:2018, is applied to the upper surface, and S2 is an area of an acting surface which includes the contact surface and on which pressure of at least 50% or more of the pressing force acts when the pressing force is applied to the upper surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a shock-absorbing flooring material that absorbs the impact received by a pedestrian when falling or the like.

Background Art

[0002] As a flooring material used in nursing care and welfare facilities, hospitals, etc., a shock-absorbing flooring material that absorbs the impact received by a pedestrian from the flooring material when falling or the like is known. As such a shock-absorbing flooring material, Patent Document 1 discloses a flooring material including a composite material containing a woody base material and a cushioning material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, interior finish boards having the texture of various materials have been developed. However, when an interior finish board containing a relatively hard material such as stone is used for a shock-absorbing flooring material, there is a risk that sufficient shock-absorbing performance cannot be stably obtained. For example, if the thickness of the shock-absorbing board is greatly restricted, bottoming occurs, which is a phenomenon in which the elastic compression of the cushioning material in the thickness direction stops when the shock-absorbing board is impacted. When bottoming occurs, the shock-absorbing board cannot sufficiently absorb the shock.

[0005]

Means for Solving the Problems

[0006] In order to solve the above problems, a shock-absorbing floor material according to an aspect of the present disclosure includes a shock diffusion layer and a shock absorption layer disposed on top of the shock diffusion layer and softer than the shock diffusion layer. The Asker C hardness of the shock absorption layer is set to a value in the range of 10 or more and 40 or less, and when the load derived from the acceleration G at the time of collision measured in the floor hardness test conforming to item 9.6.1 of JIS A 6519:2018 is used as the pressing force, when the pressing force is applied to the upper surface, the area of the contact surface of the object with respect to the upper surface is S1, and when the acting surface area where the pressure having a magnitude of at least 50% or more of the pressing force acts is S2 including the contact surface, the area ratio S2 / S1 is a value in a range exceeding 140%.

Advantages of the Invention

[0007] According to an aspect of the present disclosure, it is possible to realize a shock-absorbing floor material that can stably exhibit sufficient shock-absorbing performance while preventing bottoming, even when a material with a relatively high hardness is used or when the thickness is limited.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0009] Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings. (First Embodiment) FIG. 1 is a cross-sectional view of a shock-absorbing floor material 1 according to the first embodiment. The shock-absorbing floor material 1 shown in FIG. 1 is used, for example, as a floor material in a nursing care facility, a hospital, a rehabilitation facility, or the like. The shock-absorbing floor material 1 is used in a state where its outermost surface is exposed or in a state where another member is laid on the outermost surface. The shock-absorbing floor material 1 absorbs the shock when a pedestrian falls, thereby alleviating the shock applied to the pedestrian and protecting the pedestrian from injuries such as fractures.

[0010] The shock-absorbing floor material 1 is disposed, for example, on an existing floor or on reinforced concrete. When the shock-absorbing floor material 1 is disposed on reinforced concrete, the shock-absorbing floor material 1 is fixed to the surface of a floor slab such as a concrete slab. The size of the shock-absorbing floor material 1 in plan view is not limited. For example, a plurality of shock-absorbing floor materials 1 are laid out and disposed with respect to the surface to be constructed. As shown in FIG. 1, the shock-absorbing floor material 1 includes a shock diffusion layer 12, a shock absorption layer 10, a sound insulation layer 11, a design layer 13, and a coating layer 14. The components 10 to 14 are arranged in the same order from bottom to top. As an example, the shock-absorbing floor material 1 has an upper surface 1a exposed to the outside and a lower surface 1b fixed to the surface to be constructed. In FIG. 1, the thickness relationship of the components 10 to 14 is schematically shown.

[0011] The shock absorption layer 10 absorbs the shock acting on the shock diffusion layer 12 by elastic deformation. In other words, the shock absorption layer 10 is a cushion layer. The shock absorption layer 10 is disposed on top of the shock diffusion layer 12 and is formed to be more flexible than the shock diffusion layer 12. The shock absorption layer 10 includes, for example, a foamed member. The shock absorption layer 10 of the present embodiment includes at least one of polyurethane foam, polyethylene foam, and foamed rubber.

[0012] As an example, the shock absorption layer 10 has a uniform internal structure. The shock absorption layer 10 does not have, for example, a cavity that separates its upper layer portion from the lower layer portion or another layer located below. For this reason, the shock absorption layer 10 can uniformly absorb the shock acting from above throughout its entirety. Also, the thickness of the shock absorption layer 10 can be suppressed.

[0013] The Asker C hardness of the shock absorption layer 10 is set to a value in the range of 10 or more and 40 or less. In another example, the Asker C hardness of the shock absorption layer 10 is set to a value in the range of 10 or more and 37 or less. In another example, the Asker C hardness of the shock absorption layer 10 is set to a value in the range of 10 or more and 33 or less. In another example, the Asker C hardness of the shock absorption layer 10 is set to a value in the range of 10 or more and 24 or less.

[0014] For example, within a certain range, the lower the Asker C hardness of the shock-absorbing layer 10, the easier it is to absorb shock. Generally here, the Asker C hardness of normal (i.e., non-foamed) rubber is 60 or more, and the Asker C hardness of an elastomer is 80 or more. Therefore, the shock-absorbing layer 10 is configured to be softer than normal rubber and elastomers. The Asker C hardness of the shock-absorbing layer 10 can be measured, for example, using a commercially available rubber and plastic hardness tester (durometer) that measures according to the method compliant with JIS K 7312:1996.

[0015] The soundproofing layer 11 reduces the noise passing through the shock-absorbing flooring material 1. The soundproofing layer 11, for example, prevents noise from being transmitted from the upper surface 1a of the shock-absorbing flooring material 1 to the construction target surface side. As an example, the soundproofing layer 11 includes an adhesive that binds resin, rubber, or asphalt with a binder, and a high specific gravity filler.

[0016] The shock-diffusing layer 12 is a main component of the shock-absorbing flooring material 1. The shock-diffusing layer 12 has higher rigidity than the shock-absorbing layer 10 and diffuses the shock from the outside. The shock-diffusing layer 12 imparts rigidity to the shock-absorbing flooring material 1 and imparts the texture of various materials contained in the shock-diffusing layer 12. The shock-diffusing layer 12 has an upper surface 12a. As an example, the shock-diffusing layer 12 has a Mohs hardness of at least 4 and at most 6 in the range of at least the upper surface 12a. Thereby, the shock-diffusing layer 12 has excellent hardness at least on the upper surface 12a. The Mohs hardness of the shock-diffusing layer 12 can be measured with a Mohs hardness tester. The shock-diffusing layer 12 of the present embodiment is configured to be denser than the shock-absorbing layer 10.

[0017] The impact diffusion layer 12 is, as an example, a single substance of at least one of an organic material and an inorganic material, or a composite containing both an organic material and an inorganic material. Examples of the organic material included in the impact diffusion layer 12 can include at least one of wood and resin. Examples of the impact diffusion layer 12 containing wood can include at least one of a wooden board, plywood, cork, and a wood-based board. Examples of the wood-based board can include any one of particle board (for example, those conforming to JIS A 5908:2022) and fiber board (for example, those conforming to JIS A 5905:2022). Examples of the fiber board can include any one of insulation fiber board (IB), medium density fiber board (MDF), and hard fiber board (HB).

[0018] Also, examples of the resin included in the impact diffusion layer 12 can include at least one of polyolefin and polyvinyl chloride (PVC). Examples of the polyolefin can include at least one of polyethylene (PE) and polypropylene (PP). Examples of the polyethylene (PE) can include at least one of low density polyethylene (LDPE) and high density polyethylene (HDPE).

[0019] As another example, examples of the resin included in the impact diffusion layer 12 can include at least one of polycarbonate (PC), acrylic, styrene, and polystyrene (PS). An example of the impact diffusion layer 12 containing resin can be a resin plate. The impact diffusion layer 12 may be configured as a resin plate containing two or more kinds of resins. The two or more kinds of resins mentioned here include, for example, but are not limited to, acrylic and polystyrene.

[0020] In addition, examples of the inorganic material included in the impact diffusion layer 12 can include at least any one of stone, metal, and glass. Examples of the stone can include those containing at least any one of inorganic minerals, rocks, gravel, and sand. Examples of the impact diffusion layer 12 containing stone can include any one of gypsum board, slate board, and concrete board. Examples of the metal can include at least any one of aluminum, iron, and metal compounds containing these. An example of the impact diffusion layer 12 containing metal can be a metal plate. An example of the impact diffusion layer 12 containing glass can be a glass plate. Further, as the impact diffusion layer 12 which is a composite, for example, those in which wood powder or powder of an inorganic material is dispersed and arranged in a matrix such as resin or glass can be exemplified.

[0021] As another example, the impact diffusion layer 12 contains at least one type of inorganic material as a main component and an organic material. In the impact diffusion layer 12 of the present embodiment, as an example, the inorganic material is dispersed and arranged in a resin which is an organic material. In the impact diffusion layer 12, particulate matter containing an inorganic material may be dispersed and arranged in the resin. The resin of the impact diffusion layer 12 binds the dispersed and arranged inorganic materials. The impact diffusion layer 12 contains more than 50% by weight of the inorganic material. As an example, the impact diffusion layer 12 contains the inorganic material in a value range of 60% by weight or more and 80% by weight or less, and contains the resin in a value range of 20% by weight or more and 40% by weight or less. As another example, the texture of the stone of the impact absorption floor material 1 is mainly imparted by the inorganic material. The inorganic material and the resin contained in the impact diffusion layer 12 can be appropriately selected.

[0022] The inorganic material may contain an inorganic mineral. Further, the inorganic material can be exemplified by, for example, at least any one of calcium carbonate (CaCO3), calcium sulfate (CaSO4), barium sulfate (BaSO4), kaolin (Al4Si4O 10 (OH)8), mica, zinc oxide (ZnO), and silicon dioxide (SiO2). The inorganic material of the present embodiment contains calcium carbonate (CaCO3) as an example. The inorganic material is, for example, an extract from stone.

[0023] The organic material may contain organic minerals. Further, examples of the resin in which the inorganic material is dispersed and arranged inside include general-purpose plastics. Examples of this general-purpose plastic include at least any one of low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP). For example, since the impact diffusion layer 12 contains an inorganic material as a main component, the content of the organic matter in the impact diffusion layer 12 is suppressed. Thereby, for example, compared with a member mainly composed of resin, a member containing fiber-reinforced plastic, etc., the amount of CO2 emissions generated when disposing of the impact diffusion layer 12 by incineration or the like can be reduced well, and environmental problems can be addressed.

[0024] The impact diffusion layer 12 is configured, for example, as a single layer or a laminate in which a plurality of layers are stacked. When the impact diffusion layer 12 is configured as a laminate, for example, the Mohs hardness of the upper surface of at least the layer located at the uppermost position in the laminate may be a value in the range of 4 or more and 6 or less.

[0025] When components such as an inorganic material are dispersed and arranged in the resin throughout the impact diffusion layer 12, the internal structure of the impact diffusion layer 12 is made uniform throughout the impact diffusion layer 12. Thereby, the strength of the impact diffusion layer 12 is improved, and uniform characteristics are obtained throughout the impact diffusion layer 12. Further, by using the impact diffusion layer 12, the surface hardness of the impact absorption bedding material 1 can be improved and scratch resistance can be imparted. Thereby, for example, it is possible to prevent the surface of the impact absorption bedding material 1 from being damaged by the running of a wheelchair or the like. Further, when the impact diffusion layer 12 contains a resin, the binding of components such as an inorganic material dispersed in the resin can be maintained. Thereby, it is easy to improve the rigidity of the impact diffusion layer 12. As a result, it is possible to prevent the impact diffusion layer 12 from being damaged such as cracked or chipped during transportation, construction, and normal use of the impact absorption bedding material 1.

[0026] The design layer 13 imparts design characteristics to the shock-absorbing flooring material 1. The design layer 13 has a design with a desired pattern and color of the flooring material printed thereon. By using the design layer 13 with a specific design, the design of the shock-absorbing flooring material 1 changes. The design layer 13 is disposed, for example, so as to cover the surface of the shock-diffusion layer 12 on the side opposite to the shock-absorbing layer 10 side, and is arranged on top of the shock-diffusion layer 12. The design layer 13 is arranged in the shock-absorbing flooring material 1 so as to be visible from the outside. The material of the design layer 13 can be appropriately selected. The design layer 13 of the present embodiment includes a vinyl-based material such as polyvinyl chloride (PVC).

[0027] The coating layer 14 covers and protects the design layer 13 and the shock-diffusion layer 12, and also prevents them from getting dirty. The coating layer 14 is a plate-like body having transparency that allows at least a part of the design layer 13 to be visible from the outside. The coating layer 14 of the present embodiment absorbs light rays of a specific wavelength contained in external light. As an example, the coating layer 14 contains an ultraviolet-absorbing component. Thereby, the coating layer 14 suppresses the design layer 13 and the shock-diffusion layer 12 from deteriorating due to ultraviolet rays irradiated from the outside. The material of the coating layer 14 can be appropriately selected. The design layer 13 of the present embodiment includes, for example, a resin excellent in abrasion resistance, heat resistance, and insulation. As such a resin, the design layer 13 includes a polyester-based material such as polybutylene terephthalate (PBT). By using the coating layer 14 with high hardness, the sinking of the shock-absorbing flooring material 1 when a pedestrian walks is suppressed. Also, the application of impact to the shock-absorbing flooring material 1 locally can be suppressed.

[0028] Here, when the impact diffusion layer 12 applies a load derived from the acceleration G at the time of collision measured in the floor hardness test conforming to Item 9.6.1 of JIS A 6519:2018 as a pressing force, and the area of the contact surface of the object with respect to the upper surface 12a is S1, and the area of the working surface on which a pressure having a magnitude of at least 50% or more of the pressing force acts when the pressing force is applied to the upper surface 12a including the contact surface is S2, the area ratio S2 / S1 is a value in a range exceeding 140%. Thereby, when a pressing force acts on the upper surface 12a from an object, the pressing force diffuses in a direction along the upper surface 12a. As a result, while suppressing local impact on the upper surface 12a, the impact can be absorbed in a wide area region of the impact absorption layer 10. In the present embodiment, since the impact diffusion layer 12 has both high rigidity and hardness, for example, an impact applied to the upper surface 12a of the impact diffusion layer 12 is diffused over a wide range along the upper surface 12a. As an example, the area ratio S2 / S1 is desirably a value in a range of 150% or more, more desirably a value in a range of 170% or more, and even more desirably a value in a range of 180 or more. The upper limit value of the area ratio S2 / S1 is not particularly limited, but can be set to any one of, for example, 190%, 220%, and 260%.

[0029] Specifically, the areas S1 and S2 of the impact diffusion layer 12 can be measured, for example, using a known sensor capable of measuring the surface pressure distribution. As this sensor, for example, a tactile sensor (also referred to as a tactile sensor) can be exemplified. The form of the tactile sensor is not limited, and it may be, for example, a resistive film type. Regarding the tactile sensor, for example, the description matters of the sensors in Japanese Patent Application Laid-Open No. 2018-112405, Japanese Patent No. 6514443, and Japanese Patent No. 5980993 can be referred to. When measuring the areas S1 and S2, the surface pressure distribution may be measured using a plurality of pressure sensors.

[0030] Further, the impact diffusion layer 12 of the present embodiment has a flexural rigidity derived from the flexural modulus conforming to JIS K 7171:2016 of 1000 Nm 2 or more and 7000 Nm 2 and is set to a value in the following range. As an example, the value of this flexural rigidity is 2500 Nm 26500 Nm or more 2 Values in the following range are desirable, 3500 Nm 2 5500 Nm or more 2 Values in the following range are more desirable. The flexural rigidity referred to here is calculated by the following Equation 1. [Equation 1] Flexural rigidity (EI) = longitudinal Young's modulus (E) × moment of inertia (I)

[0031] In the shock-absorbing floor material 1, shock is absorbed in a wide area region of the shock-absorbing layer 10. Therefore, even if the thickness of the shock-absorbing floor material 1 is reduced, bottoming can be prevented. The total thickness of the shock-absorbing floor material 1 of the present embodiment is, as an example, a value in the range greater than 15 mm and less than or equal to 30 mm. Also, as an example, the thickness of the shock diffusion layer 12 in the total thickness of the shock-absorbing floor material 1 is a value in the range of 15% or more and 40% or less.

[0032] For example, within a certain range, by reducing the thickness of the shock diffusion layer 12 in the total thickness of the shock-absorbing floor material 1, the balance of the rigidity, hardness, and shock absorption characteristics of the shock-absorbing floor material 1 can be improved. Therefore, the thickness of the shock diffusion layer 12 in the total thickness of the shock-absorbing floor material 1 is preferably, for example, in the range of 15% or more and 35% or less, and a value in the range of 15% or more and 30% or less is even more preferable.

[0033] The thickness of the shock-absorbing layer 10 is greater than the total thickness of the shock diffusion layer 12 and the design layer 13. In the shock-absorbing floor material 1, another member may be disposed between two adjacent components among the components 10 to 14.

[0034] The shock absorption performance of the shock-absorbing floor material 1 can be adjusted, for example, by the materials and thicknesses of the respective components 10 to 14 included in the shock-absorbing floor material 1. Also, for example, when the Asker C hardness of the shock-absorbing layer 10 is decreased, the shock absorption of the shock-absorbing floor material 1 is improved, but when the shock-absorbing floor material 1 is locally impacted, bottoming is likely to occur. Therefore, it is preferable to adjust the Asker C hardness of the shock-absorbing layer 10 while maintaining the value of the area ratio S2 / S1 described above in a range exceeding 140%.

[0035] As described above, in the shock-absorbing floor material 1, the area ratio S2 / S1 of the shock-diffusing layer 12 is set to a value in the range exceeding 140%. Therefore, when an impact is applied to the upper surface 1a of the shock-absorbing floor material 1, the impact diffuses in the direction along the upper surface 12a of the shock-diffusing layer 12. As a result, it is possible to suppress the local sinking of the shock-absorbing layer 10 that has been impacted by the shock-diffusing layer 12, and even the shock-absorbing layer 10 with a relatively small thickness can absorb the impact over a wide area. Further, the Asker C hardness of the shock-absorbing layer 10 is set to a value in the range of 10 or more and 40 or less. Therefore, the impact applied from the shock-diffusing layer 12 can be well absorbed by the shock-absorbing layer 10. Thus, even when a relatively high-hardness material is used or the thickness is limited, sufficient shock-absorbing performance of the shock-absorbing floor material 1 can be stably exhibited while preventing bottoming.

[0036] Further, the shock-diffusing layer 12 of the present embodiment has a flexural rigidity derived from the flexural modulus conforming to JIS K 7171:2016 of 1000 Nm 2 or more and 7000 Nm 2 or less. Thereby, the flexural rigidity of the shock-absorbing floor material 1 can be improved, and the impact acting on the upper surface 1a of the shock-absorbing floor material 1 can be more easily diffused in the direction along the upper surface 12a of the shock-diffusing layer 12.

[0037] Further, the shock-diffusing layer 12 of the present embodiment is disposed above the shock-absorbing layer 10. According to this configuration, when an impact is applied to the upper surface 1a of the shock-absorbing floor material 1, the impact can be more easily diffused in the direction along the upper surface 12a of the shock-diffusing layer 12 before the impact is applied to the shock-absorbing layer 10. As a result, local sinking of the shock-absorbing layer 10 can be suppressed, and bottoming of the shock-absorbing floor material 1 can be prevented.

[0038] Further, the shock-diffusing layer 12 of the present embodiment contains at least one inorganic material as a main component and a resin, and the inorganic material is dispersed and arranged in the resin. Thereby, for example, compared with the case where the shock-diffusing layer is composed only of stone, it is easier to impart rigidity as well as hardness to the shock-diffusing layer 12.

[0039] In addition, in the shock-absorbing floor material 1 of the present embodiment, as an example, the Mohs hardness of at least the upper surface 12a of the shock-diffusion layer 12 is a value in the range of 4 or more and 6 or less. Thereby, excellent hardness can be imparted to the shock-diffusion layer 12 together with rigidity. Further, by combining the shock-diffusion layer 12 having such hardness with the shock-absorbing layer 10, the shock transmitted to the surface of the shock-absorbing floor material 1 can be diffused over a wide surface area of the shock-absorbing floor material 1, and it can be easily suppressed that the shock reaches the shock-absorbing floor material 1 locally. In addition, the shock diffused by the shock-diffusion layer 12 can be appropriately absorbed by the shock-absorbing layer 10.

[0040] In addition, the shock-absorbing floor material 1 of the present embodiment has a total thickness that is greater than 15 mm and less than or equal to 30 mm, and the thickness of the shock-diffusion layer 12 in the total thickness is a value in the range of 15% or more and 40% or less. Thereby, a shock-absorbing floor material 1 having sufficient shock-absorbing performance can be realized with a relatively small thickness. Further, by reducing the thickness of the shock-diffusion layer 12 in the shock-absorbing floor material 1, for example, while maintaining the total thickness of the shock-absorbing floor material 1, the thickness of the shock-absorbing layer 10 can be increased, and the shock-absorbing performance can be easily improved.

[0041] In addition, in the present embodiment, the inorganic material included in the shock-diffusion layer 12 contains calcium carbonate. Thereby, the shock-absorbing floor material 1 can be produced at a relatively low cost, and excellent shock-absorbing performance can be imparted to the shock-absorbing floor material 1.

[0042] In addition, in the present embodiment, the resin included in the shock-diffusion layer 12 is at least any one of low-density polyethylene, high-density polyethylene, and polypropylene. By using such a resin, the degree of freedom in designing the shock-absorbing floor material 1 can be improved, and the manufacturing cost of the shock-absorbing floor material 1 can be reduced.

[0043] In addition, the shock-absorbing floor material 1 of the present embodiment includes a design layer 13 disposed on top of the shock-diffusion layer 12 so as to cover the surface of the shock-diffusion layer 12 on the side opposite to the shock-absorbing layer 10 side. Thereby, a shock-absorbing floor material 1 having sufficient shock-absorbing performance and a high degree of freedom in design with high design quality can be realized.

[0044] Also, as another example, the shock absorption layer 10 is thicker than the shock diffusion layer 12. Thereby, the shock diffused by the shock diffusion layer 12 can be sufficiently absorbed by the elastic deformation of the shock absorption layer 10. Therefore, bottoming can be further prevented. Hereinafter, the second embodiment will be described centering on the differences from the first embodiment. (Second Embodiment) FIG. 2 is a cross-sectional view of the shock absorption flooring material 101 according to the second embodiment. The shock absorption flooring material 101 includes at least one engaging portion arranged to be engageable with other flooring materials. As shown in FIG. 2, as an example of the engaging portion, the shock absorption flooring material 101 includes a plurality of engaging portions 101c and 101d. The plurality of engaging portions 101c and 101d include a protruding portion 101c protruding outward from each peripheral edge of the upper surface 101a and the lower surface 101b in a plan view, and a recessed portion 101d recessed inward from each peripheral edge between the upper surface 101a and the lower surface 101b of the shock absorption flooring material 101.

[0045] The protruding portion 101c is inserted into a recessed portion 12d provided in another adjacent plate material 120. The recessed portion 101d is inserted with a protruding portion 121c provided in another adjacent plate material 121. Thereby, the shock absorption flooring material 101 engages with the other plate materials 120 and 121. According to the second embodiment, for example, by engaging a plurality of shock absorption flooring materials 101 with the engaging portions 101c and 101d, the degree of freedom in designing a floor having sufficient shock absorption performance by the shock absorption flooring material 101 can be improved.

[0046] (Confirmation Test) Next, the confirmation test will be described, but the present disclosure is not limited to any of the following examples. [Test 1] In this confirmation test, as an example corresponding to the shock absorption flooring material 1, as shown in FIG. 1, a flooring material unit (hereinafter, also referred to as an example flooring material unit) in which a sound insulation layer 11, a shock diffusion layer 12, a design layer 13, and a coating layer 14 are stacked was used, and shock absorption flooring materials 1 of Examples 1 and 2 in which shock absorption layers 10 having different Asker C hardnesses for each material were stacked were produced.

[0047] As the shock-absorbing layer 10 in Examples 1 and 2, an independent foamed sheet of EPDM with an apparent specific gravity of 0.1 g / m 2 was used. The thickness of the shock-absorbing layer 10 in Example 1 is 10.0 mm. The thickness of the shock-absorbing layer 10 in Example 2 is 20.0 mm.

[0048] Also, as the example floor material units in Examples 1 and 2, an impact diffusion layer 12 was used, which was obtained by uniformly mixing 70% of an inorganic substance such as a stone containing calcium carbonate and 30% of a polypropylene resin, followed by hot press molding, and integrating a polyvinyl chloride resin on the surface layer. Further, the thickness of the sound insulation layer 11 in the example floor material unit was set to 1.0 mm. Also, the total thickness of the impact diffusion layer 12 and the design layer 13 in the example floor material unit was set to 4.5 mm. Also, the thickness of the coating layer 14 in the example floor material unit was set to 0.5 mm. The total thickness of Example 1 was set to 16.0 mm, and the total thickness of Example 2 was set to 26.0 mm. The impact diffusion layers 12 in Examples 1 and 2 contain 70% by weight of an inorganic material and 30% by weight of a resin. The inorganic material contained in the impact diffusion layers 12 in Examples 1 and 2 contains calcium carbonate.

[0049] Also, a configuration in which the shock-absorbing layer 10 was omitted from Example 1 (a configuration consisting only of the example floor material unit) was prepared as Comparative Example 1 (total thickness 6.0 mm). Also, a normal floor made only of wood was prepared as Comparative Example 2 (total thickness 14 mm). Also, a normal floor made only of a concrete floor was prepared as Comparative Example 3.

[0050] Regarding the samples of Examples 1 and 2 and Comparative Examples 1 to 3, the acceleration G (m / s 2 at the time of collision in the floor hardness test conducted in accordance with Item 9.6.1 of JIS A 6519:2018 was measured. Also, from the measured value of the acceleration G, the load F (N), which is the pressing force, was derived. Also, the areas S1 and S2 were measured using a tactile sensor, and the area ratio S2 / S1 (%) was calculated. Note that the "acceleration G" described in this document can be unit-converted based on the relationship of 1.0 G = 9.80665 m / s 2 . The test results are shown in Table 1.

[0051]

Table 1

[0052] As shown in Table 1, it was confirmed that Examples 1 and 2 could diffuse the impact applied as the pressing force to the impact diffusion layer 12 over a wider range compared with Comparative Examples 1 to 3. As a result, it is considered that Examples 1 and 2 suppress the local sinking of the shock absorption layer 10 affected by the impact from the impact diffusion layer 12, and the shock absorption layer 10 with a relatively small thickness can absorb the impact over a wide area. In addition, the shore C hardness of the shock absorption layers 10 used in Examples 1 and 2 was within the appropriate range. From this test result, it is considered that Examples 1 and 2 can exhibit excellent shock absorption performance.

[0053] [Test 2] Example 3 was prepared by extracting only the impact diffusion layer 12 similar to those of Examples 1 and 2. In addition, each plate material shown in Table 2 below was prepared as Comparative Examples 4 to 12. For these samples, the second moment of area and the flexural rigidity were measured respectively. The measured values of Example 3 and Comparative Examples 4 to 12 are shown in Table 2 together with their respective flexural modulus of elasticity, width, and thickness. Note that "Calcium Silicate Board 1" of Comparative Example 7 is a calcium silicate board with a bulk density of 0.8 g / cm 3 and "Calcium Silicate Board 2" of Comparative Example 8 is a zonoite-based calcium silicate artificial wood with a bulk density of 0.5 g / cm 3 . Comparative Example 9 is the material constant of steel described in the "Steel Structure Design Standard" of the Architectural Institute of Japan.

[0054]

Table 2

[0055] As shown in Table 2, it was confirmed that Example 3 has a higher flexural rigidity than Comparative Examples 4 to 7 and 9 to 12. Note that although Comparative Example 8 has a higher flexural rigidity value than Example 3, since the area ratio S2 / S1 is within the range of 140% or less, it is considered to be inferior in performance compared with Example 3.

[0056] (Disclosed Items) The following items disclose preferred forms of the shock-absorbing floor material of the present disclosure. [Item 1] A shock diffusion layer, A shock absorption layer disposed on top of the shock diffusion layer and softer than the shock diffusion layer, The Asker C hardness of the shock absorption layer is set to a value in the range of 10 or more and 40 or less, The shock diffusion layer uses, as the pressing force, the load derived from the acceleration G at the time of collision measured in the floor hardness test conforming to Item 9.6.1 of JIS A 6519:2018. When the area of the contact surface of the object with the upper surface when the pressing force is applied to the upper surface is S1, and the area of the working surface on which a pressure having a magnitude of at least 50% or more of the pressing force acts when the pressing force is applied to the upper surface including the contact surface is S2, the area ratio S2 / S1 is a value in the range exceeding 140%. A shock-absorbing floor material.

[0057] According to the shock-absorbing floor material having the above configuration, when the area ratio S2 / S1 is set to a value in the above range, when an impact is applied to the upper surface of the shock-absorbing floor material, the impact diffuses in a direction along the upper surface of the shock diffusion layer. As a result, it is possible to suppress the local sinking of the shock absorption layer that has been impacted by the shock diffusion layer, and even a shock absorption layer with a relatively small thickness can absorb the shock over a wide area. In addition, the Asker C hardness of the shock absorption layer is set to a value in the range of 10 or more and 40 or less. For this reason, the shock transmitted from the shock diffusion layer can be better absorbed by the shock absorption layer. Therefore, even when a relatively high-hardness material is used or the thickness is limited, sufficient shock absorption performance of the shock-absorbing floor material can be stably exhibited while preventing bottoming. [Item 2] The shock diffusion layer has a flexural rigidity derived from the flexural modulus conforming to JIS K 7171:2016 of 1000 Nm 2 or more and 7000 Nm 2 or less. The shock-absorbing floor material according to Item 1.

[0058] According to the above configuration, the bending rigidity of the shock-absorbing flooring material can be improved, and the shock acting on the upper surface of the shock-absorbing flooring material can be more easily diffused in the direction along the upper surface.

[0059] [Item 3] The shock-absorbing flooring material according to item 1 or 2, wherein the shock diffusion layer is disposed above the shock-absorbing layer.

[0060] According to the above configuration, when a shock acts on the upper surface of the shock-absorbing flooring material, the shock can be more easily diffused in the direction along the upper surface of the shock diffusion layer before the shock is applied to the shock-absorbing layer. As a result, local sinking of the shock-absorbing layer can be suppressed, and bottoming can be prevented.

[0061] [Item 4] The shock-absorbing flooring material according to any one of items 1 to 3, wherein the shock-absorbing layer is thicker than the shock diffusion layer.

[0062] According to the above configuration, the shock diffused by the shock diffusion layer can be sufficiently absorbed by the elastic deformation of the shock-absorbing layer. Therefore, bottoming can be further prevented.

[0063] [Item 5] The shock-absorbing flooring material according to any one of items 1 to 4, further comprising at least one engaging portion disposed so as to be engageable with another flooring material.

[0064] According to the above configuration, for example, by engaging a plurality of shock-absorbing flooring materials with each other by the engaging portions, the degree of freedom in designing a floor having sufficient shock-absorbing performance by the shock-absorbing flooring materials can be improved.

[0065] [Item 6] The shock-absorbing flooring material according to any one of items 1 to 5, wherein the shock diffusion layer contains at least one inorganic material as a main component and a resin, and the inorganic material is dispersed and disposed in the resin.

[0066] According to the above configuration, in the impact diffusion layer, at least one inorganic material as the main component is dispersed and arranged in the resin, so that, for example, compared with the case where the impact diffusion layer is composed only of stone, it is easier to impart rigidity as well as hardness to the impact diffusion layer.

[0067] [Item 7] The impact-absorbing flooring material according to item 6, wherein the inorganic material contains calcium carbonate.

[0068] According to the above configuration, the impact-absorbing flooring material can be produced at a relatively low cost, and excellent impact-absorbing performance can be imparted to the impact-absorbing flooring material.

[0069] [Item 8] The impact-absorbing flooring material according to item 6 or 7, wherein the resin is at least any one of low-density polyethylene, high-density polyethylene, and polypropylene.

[0070] According to the above configuration, the degree of freedom in designing the impact-absorbing flooring material can be improved, and the manufacturing cost of the impact-absorbing flooring material can be reduced.

[0071] [Item 9] The impact-absorbing flooring material according to any one of items 1 to 8, wherein the impact diffusion layer is a single body of at least any one of an organic material and an inorganic material, or a composite containing both the organic material and the inorganic material.

[0072] According to the above configuration, by expanding the material range of the impact diffusion layer, the degree of freedom in designing the impact diffusion layer can be improved.

[0073] [Item 10] The impact-absorbing flooring material according to any one of items 1 to 9, wherein the impact diffusion layer has a Mohs hardness of at least 4 or more and 6 or less on at least the upper surface.

[0074] According to the above configuration, excellent hardness can be imparted to the impact diffusion layer. As a result, the impact transmitted to the surface of the shock-absorbing flooring material can be diffused over a wide surface area of the shock-absorbing flooring material, further suppressing the impact from reaching the shock-absorbing flooring material locally.

[0075] [Item 11] The shock-absorbing flooring material according to any one of Items 1 to 10, wherein the total thickness is a value greater than 15 mm and equal to or less than 30 mm, and the thickness of the impact diffusion layer in the total thickness is a value in the range of 15% or more and 40% or less.

[0076] According to the above configuration, the shock-absorbing flooring material 1 having sufficient shock-absorbing performance can be realized with a relatively small thickness. Furthermore, by reducing the thickness of the impact diffusion layer in the shock-absorbing flooring material, for example, while maintaining the total thickness of the shock-absorbing flooring material, the thickness of the shock-absorbing layer can be increased, making it easier to improve the shock-absorbing performance.

[0077] [Item 12] The shock-absorbing flooring material according to any one of Items 1 to 11, comprising a design layer disposed above the impact diffusion layer.

[0078] According to the above configuration, the shock-absorbing flooring material 1 having sufficient shock-absorbing performance and a high degree of design freedom with excellent design can be realized.

[0079] The configuration of the present disclosure is not limited to those of the above-described embodiments and examples, and the configuration and method can be changed, added, or deleted without departing from the spirit of the present disclosure. Each aspect disclosed in this specification can be combined with any other feature disclosed in this specification. In the shock-absorbing flooring materials 1 and 101, the soundproof layer 11, the design layer 13, and the coating layer 14 are not essential, and any one of them may be omitted.

Description of Reference Numerals

[0080] 1, 101 Shock-absorbing flooring material 10 Shock-absorbing layer 12 Impact diffusion layer 12a Upper surface of the impact diffusion layer 13 Design layer Engagement parts 101c and 101d

Claims

1. An impact diffusion layer, An impact absorption layer disposed overlapping the impact diffusion layer and being more flexible than the impact diffusion layer, and The Asker C hardness of the impact absorption layer is set to a value in the range of 10 or more and 40 or less, The impact diffusion layer uses, as a pressing force, a load derived from the acceleration G at the time of collision measured in a floor hardness test conforming to Item 9.6.1 of JIS A 6519:2018. When the area of the contact surface of the object with respect to the upper surface when the pressing force is applied to the upper surface is S1, and the area of the working surface on which a pressure having a magnitude of at least 50% or more of the pressing force acts when the pressing force is applied to the upper surface including the contact surface is S2, the area ratio S2 / S1 is a value in a range exceeding 140%. An impact absorption flooring material.

2. The bending rigidity derived from the flexural modulus in accordance with JIS K 7171:2016 of the impact diffusion layer is 1000 Nm ２ or more and 7000 Nm ２ The impact-absorbing floor material according to claim 1, wherein the value is set within the following range.

3. The impact absorption flooring material according to Claim 1, wherein the impact diffusion layer is disposed above the impact absorption layer.

4. The impact absorption flooring material according to Claim 1, wherein the impact absorption layer is thicker than the impact diffusion layer.

5. The impact absorption flooring material according to Claim 1, further comprising at least one engaging portion disposed so as to be engageable with another flooring material.

6. The impact absorption flooring material according to Claim 1, wherein the impact diffusion layer includes at least one inorganic material as a main component and a resin, and the inorganic material is dispersed and disposed in the resin.

7. The impact absorption flooring material according to Claim 6, wherein the inorganic material includes calcium carbonate.

8. The impact absorption flooring material according to Claim 6, wherein the resin is at least any one of low-density polyethylene, high-density polyethylene, and polypropylene.

9. The impact absorption flooring material according to Claim 1, wherein the impact diffusion layer is a single body of at least any one of an organic material and an inorganic material, or a composite including both the organic material and the inorganic material.

10. The impact absorption flooring material according to any one of Claims 1 to 9, wherein the Mohs hardness of at least the upper surface of the impact diffusion layer is a value in the range of 4 or more and 6 or less.

11. The impact absorption flooring material according to any one of Claims 1 to 9, having a total thickness greater than 15 mm and in the range of 30 mm or less, and the thickness of the impact diffusion layer in the total thickness being in the range of 15% or more and 40% or less.

12. The impact absorption flooring material according to any one of Claims 1 to 9, comprising a design layer disposed above the impact diffusion layer.

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