Shock-absorbing material

Abstract

To provide an impact absorption material having excellent impact noise reduction property.SOLUTION: An impact absorption material 100 comprises: a surface layer 1; a buffer material layer 4 provided under the surface layer 1; a polymer resin layer 5 provided under the buffer material layer 4; and a buffer material layer 6 provided under the polymer resin layer 5. Each of the buffer material layer 4 and the buffer material layer 6 includes a plurality of organic fibers entangled with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an impact-absorbing material. More specifically, it relates to an impact-absorbing material comprising a surface layer made of a fibrous material. [Background technology]

[0002] With the proliferation of apartment buildings, there is a growing need for shock-absorbing materials that can suppress the transmission of impact and impact noise to adjacent rooms. As a conventional shock-absorbing material, for example, Patent Document 1 below discloses a fiber floor tile with excellent sound insulation properties. The fiber floor tile in Patent Document 1 below is constructed by sequentially laminating a fiber surface layer made of fibrous material, a polymer resin backing layer, a reinforcing backing layer made of woven or nonwoven fabric made of inorganic or organic fibers, a fused fiber-containing fibrous backing layer, and a polymer resin backing layer. The fused fiber-containing fibrous backing layer has a thickness of 3 mm or more and a density of 0.05 g / cm². 3 ~0.08 g / cm³ 3 A fibrous nonwoven fabric having a density such that each fiber is fused and reinforced with fusible fibers. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 2976866 [Overview of the project] [Problems that the invention aims to solve]

[0004] The fiber floor tiles described in Patent Document 1 had the problem of poor impact sound reduction. Specifically, one possible method to improve the impact sound reduction of the fiber floor tiles described in Patent Document 1 is to increase the thickness of the fused fiber-containing fibrous backing layer, which is the layer that absorbs impact. However, when the fused fiber-containing fibrous backing layer becomes thicker, the peel strength of the fused fiber-containing fibrous backing layer decreases. As a result, when a load is applied to the fused fiber-containing fibrous backing layer, it becomes more susceptible to damage.

[0005] In addition, when the fused fiber-containing fibrous backing layer becomes thick, the elasticity of the fused fiber-containing fibrous backing layer decreases. For this reason, when a load is applied to the fused fiber-containing fibrous backing layer, the fiber floor tile wobbles, and the stability of the fiber floor tile is impaired.

[0006] For these reasons, it is impossible to thicken the fused fiber-containing fibrous backing layer, and it is impossible to enhance the impact sound reduction property of the fiber floor tile of Patent Document 1.

[0007] The present invention is for solving the above problems, and an object thereof is to provide an impact absorbing material having excellent impact sound reduction property.

Means for Solving the Problems

[0008] An impact absorbing material according to one aspect of the present invention includes a surface layer, an upper buffer layer provided under the surface layer, a lower polymer resin layer provided under the upper buffer layer, and a lower buffer layer provided under the lower polymer resin layer, and each of the upper buffer layer and the lower buffer layer contains a plurality of organic fibers entangled with each other.

[0009] In the above impact absorbing material, preferably, the density of the lower buffer layer is higher than the density of the upper buffer layer.

Effects of the Invention

[0010] According to the present invention, it is possible to provide an impact absorbing material having excellent impact sound reduction property.

Brief Description of the Drawings

[0011] [Figure 1] It is a cross-sectional view showing the configuration of an impact absorbing material 100 in one embodiment of the present invention. [Figure 2] In one embodiment of the present invention, it is a plan view showing the configuration of the impact absorbing material 100 when viewed from the side of the anti-slip layer 7. [Figure 3]A table showing the specific materials of the sample in the first embodiment of the present invention, etc. [Figure 4] A table showing the lightweight floor impact sound reduction performance and peel strength of each of Samples 12 to 35 in the second embodiment of the present invention.

Modes for Carrying Out the Invention

[0012] Hereinafter, an embodiment of the present invention will be described based on the drawings.

[0013] FIG. 1 is a cross-sectional view showing the configuration of the shock-absorbing material 100 in an embodiment of the present invention. FIG. 2 is a plan view showing the configuration of the shock-absorbing material 100 when viewed from the side of the anti-slip layer 7 in an embodiment of the present invention.

[0014] Referring to FIG. 1, the shock-absorbing material 100 (an example of a shock-absorbing material) in the present embodiment is used as a floor tile to be placed on the floor. The shock-absorbing material 100 may be arranged on a support S (here, the floor). The shock-absorbing material 100 has, for example, a rectangular shape with a side length of 20 cm to 80 cm when viewed in plan. The shock-absorbing material 100 is used in a state where the surface layer 1 faces the direction opposite to the support S (the upward direction in FIG. 1). In order to suppress the occurrence of various obstacles due to the step between the surface of the support S where the shock-absorbing material 100 is not arranged and the surface of the shock-absorbing material 100, it is preferable that the shock-absorbing material 100 has a thickness W (the length in the vertical direction in FIG. 1) greater than 0 and not more than 20 mm.

[0015] The shock-absorbing material 100 comprises a surface layer 1 (an example of a surface layer), a polymer resin layer 2 (an example of an upper polymer resin layer), a reinforcing layer 3 (an example of a reinforcing layer), a cushioning layer 4 (an example of an upper cushioning layer), a polymer resin layer 5 (an example of a lower polymer resin layer), a cushioning layer 6 (an example of a lower cushioning layer), and an anti-slip layer 7 (an example of an anti-slip layer). The surface layer 1 is the uppermost layer, furthest from the support material S, and is the layer that comes into contact with the user. The polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, and cushioning layer 6 are each provided in this order from top to bottom and are backing layers to maintain the shape and size of the surface layer 1. Specifically, the polymer resin layer 2 is provided below the surface layer 1 and above the reinforcing layer 3. The reinforcing layer 3 is provided below the polymer resin layer 2 and above the cushioning layer 4. The cushioning layer 4 is provided below the reinforcing layer 3 and above the polymer resin layer 5. The polymer resin layer 5 is located below the cushioning material layer 4 and above the cushioning material layer 6. The cushioning material layer 6 is located below the polymer resin layer 5 and above the anti-slip layer 7. The anti-slip layer 7 is fused to the lower surface of the cushioning material layer 6 and is the portion that contacts the support material S in the shock-absorbing material 100.

[0016] The surface layer 1 provides the shock-absorbing material 100 with design features, heat retention, and sound absorption. The surface layer 1 is made of a fibrous material. The surface layer 1 includes, for example, a pile layer 11 and a base fabric layer 12. The surface layer 1 has a thickness of, for example, 4.0 mm or more and 6.0 mm or less.

[0017] The pile layer 11 is fixed on the base fabric layer 12. The pile layer 11 is embedded in the base fabric layer 12, for example, by tufting. The pile layer 11 is formed from pile yarn made of synthetic fibers such as nylon, acrylic, polyester, or polypropylene, or natural fibers such as wool. In particular, when the pile layer 11 is made of pile yarn made of nylon, it is possible to impart excellent abrasion resistance, strength, elasticity, and a cool-to-the-touch feel to the surface layer 1. The pile layer 11 may be a cut pile with cut and aligned ends, a loop pile with looped ends, or a mixture of cut pile and loop pile.

[0018] The base fabric layer 12 is made of synthetic fibers such as polyester or polypropylene. The base fabric layer 12 may be woven or nonwoven. Preferably, the base fabric layer 12 is made of spunbond made of polyester.

[0019] Furthermore, instead of the surface layer 1 being a surface layer made of fibrous material, the surface layer 1 may be a surface layer of a hard flooring material made of a vinyl chloride-based material or an olefin-based plastic. Also, the surface layer 1 may be a surface layer of flooring material.

[0020] Each of the polymer resin layers 2 and 5 is a layer containing a polymer resin. Each of the polymer resin layers 2 and 5 contains, for example, a polymer resin, a plasticizer, and the required additives. The polymer resin is made of, for example, polyvinyl chloride resin, ethylene resin, ethylene vinyl acetate resin, polyvinyl chloride resin, amorphous olefin polymer resin, asphalt-based resin, etc. Since these polymer resins have appropriate rigidity and flexibility, by using these polymer resins, the load received by the shock-absorbing material 100 can be received by the entire polymer resin layer 2 or 5. In addition, since these polymer resins have sufficient adhesive strength, peeling of the adhesive joint can be prevented when bonding with adjacent layers. The polymer resin is preferably made of polyvinyl chloride resin. The plasticizer is preferably liquid at room temperature. The plasticizer is made of, for example, natural wax, synthetic wax, or modified wax. Each of the polymer resin layers 2 and 5 has a thickness of, for example, 1.0 mm or more and 3.0 mm or less.

[0021] The materials constituting each of the polymer resin layers 2 and 5 may be different from each other, but from the viewpoint of simplifying the manufacturing method, it is preferable that they be the same. The thicknesses of each of the polymer resin layers 2 and 5 may be the same or different from each other. Furthermore, since polymer resin layer 5 is further away from the surface layer 1 than polymer resin layer 2, by making the density of polymer resin layer 5 higher than the density of polymer resin layer 2, it is possible to suppress changes in the shape of the shock-absorbing material 100 over time (such as curling of the shock-absorbing material 100).

[0022] The reinforcing layer 3 is a layer that reinforces the surface layer 1. The reinforcing layer 3 is made of a woven or nonwoven fabric of any material. The reinforcing layer 3 plays a role in preventing elongation under load. The reinforcing layer 3 also plays a role in preventing expansion or contraction due to temperature changes. Preferably, the reinforcing layer 3 is made of a glass fiber woven fabric. When the reinforcing layer 3 is made of a glass fiber woven fabric, the reinforcing layer 3 can be embedded inside the polymer resin layer 2 through the mesh of the glass fiber woven fabric.

[0023] The strength of the impact-absorbing material 100 is improved by providing the polymer resin layer 2 and the reinforcing layer 3. However, the polymer resin layer 2 and the reinforcing layer 3 may be omitted.

[0024] Each of the cushioning layers 4 and 6 is a layer that absorbs impact and reduces impact noise. Each of the cushioning layers 4 and 6 may also serve as an insulating layer. Each of the cushioning layers 4 and 6 contains multiple organic fibers that are intertwined with each other, and a bonding agent that fuses the multiple organic fibers together. The bonding agent may be omitted.

[0025] Each of the cushioning layers 4 and 6 is preferably made using raw cotton containing regular cotton (solid organic fibers), hollow organic fibers, and heat-fusible fibers, and a spunbond nonwoven fabric. Regular cotton refers to ordinary organic fibers that do not have a hollow core. Hollow short fibers refer to organic fibers that have a hollow core. The materials constituting each of the cushioning layers 4 and 6 may be different from each other, but it is preferable that they be the same from the viewpoint of simplifying the manufacturing method.

[0026] Each of the buffer layers 4 and 6 is preferably manufactured by the following method. First, the regular cotton in clumps, hollow organic fibers, and heat-fusible fibers are loosened and blended in appropriate proportions to produce raw cotton (blending and fiber opening). Next, the clumps of raw cotton are formed into a sheet using a carding machine to produce a web (web forming). Next, the web is laminated in multiple layers using a cross-layer (web lamination). Next, spunbond nonwoven fabric is placed along the upper or lower side of the laminated web (spunbond insertion). Next, the laminated web and spunbond are entangled with each other using a special needle with a barb (needle punching). Next, the heat-fusible fibers are melted by heating the entangled web and spunbond in a drying oven. The melted heat-fusible fibers act as a fuser, integrating the entangled web and spunbond (fusion).

[0027] Regular cotton is a solid organic fiber, for example, made of general-purpose polyester staple fiber. Hollow organic fiber is made of conjugate fiber including, for example, hollow polyester staple fiber. Heat-sealable fiber is made of, for example, polyester staple fiber having a low melting point of about 110°C. The heat-sealable fiber is preferably blended at a ratio of 20 to 50% by weight based on 100% by weight of the organic fiber. The spunbond nonwoven fabric is made of, for example, polyester having a density of 20 g / m 2 and having.

[0028] The buffer layer 4 has a density of 0.081 g / cm 3 or more and 0.100 g / cm 3 or less, and preferably has a thickness of 6.5 mm or more. By setting the density of the buffer layer 4 to 0.081 g / cm 3 or more, the strength and elastic force of the buffer layer 4 are improved, and it becomes difficult to break. When the density of the buffer layer 4 is 0.081 g / cm 3 or more, When the density of the buffer layer 4 is less than 0.081 g / cm 3 the buffer layer 4 becomes harder than in the case of less than, and the impact sound reduction property of the buffer layer 4 decreases. However, by providing the buffer layer 6 in addition to the buffer layer 4, the reduced impact sound reduction property is compensated. Furthermore, by setting the thickness of the buffer layer 4 to 6.5 mm or more, the impact sound reduction property can be effectively enhanced, and the lightweight floor impact sound reduction performance of the impact absorbing material 100 can be made LL37 or less. On the other hand, by setting the density of the buffer layer 4 to 0.100 g / cm 3 or less, good impact sound reduction property can be ensured.

[0029] The buffer layer 4 preferably has a thickness within the range where the total thickness of the impact absorbing material 100 is 20 mm or less. In particular, by setting the thickness of the buffer layer 4 to 9.5 mm or less, it is possible to suppress a decrease in peel strength accompanying an increase in the thickness of the buffer layer 4.

[0030] The buffer layer 6 has a thickness of, for example, 2 mm or more and 4 mm or less. The buffer layer 6 has a density of 0.081 g / cm 3 or more and 0.13 It is preferable that the following densities be present.

[0031] Each of the cushioning material layers 4 and 6 may have any thickness and density. Preferably, the thickness of cushioning material layer 4 is greater than the thickness of cushioning material layer 6. Since cushioning material layer 4 is closer to the surface layer 1 than cushioning material layer 6, making cushioning material layer 4 thicker than cushioning material layer 6 can effectively improve impact sound reduction. Preferably, the density of cushioning material layer 6 is higher than the density of cushioning material layer 4. By making the density of cushioning material layer 6 higher than the density of cushioning material layer 4, changes in the shape of the impact absorbing material 100 over time (such as curling of the impact absorbing material 100) can be suppressed. The density of each of the cushioning material layers 4 and 6 can be adjusted by changing the degree of entanglement of the multiple organic fiber layers. That is, the greater the degree of entanglement of the multiple organic fiber layers, the higher the density.

[0032] Furthermore, instead of each of the cushioning layers 4 and 6 being made of a material containing multiple organic fiber layers and a bonding agent, each of the cushioning layers 4 and 6 may be made of a material containing urethane. Even when made of a material containing urethane, each of the cushioning layers 4 and 6 exhibits excellent impact sound reduction properties. On the other hand, from the viewpoint of being less prone to deterioration over time, it is preferable that each of the cushioning layers 4 and 6 be made of a material containing multiple organic fiber layers and a bonding agent.

[0033] Referring to Figures 1 and 2, the anti-slip layer 7 is a layer that prevents the shock-absorbing material 100 from slipping against the support material S. The anti-slip layer 7 is made of a resin, such as acrylic resin. When viewed in plan (viewed from the bottom in Figure 1), at least a portion of the anti-slip layer 7 is provided in a dot pattern on the lower surface of the cushioning material layer 6. The anti-slip layer 7 has a thickness of, for example, 0.3 mm to 0.8 mm.

[0034] Because resin is non-slip, providing a non-slip layer 7 made of resin makes it less likely for the shock-absorbing material 100 to slip against the support material S. Furthermore, since resin fuses firmly to organic fibers, the non-slip layer 7 can be firmly fixed to the cushioning material layer 6. Therefore, there is no need to separately provide an anti-slip material (such as double-sided tape) on the underside of the cushioning material layer 6, and the anti-slip effect is greater than if an anti-slip material were provided separately. In addition, by providing the non-slip layer 7 in a dot pattern, costs can be reduced and weight can be reduced compared to providing the non-slip layer 7 over the entire underside of the cushioning material layer 6.

[0035] The anti-slip layer 7 may be omitted. In this case, the shock-absorbing material 100 may be attached to the support material S using double-sided tape or an anti-slip member.

[0036] The shock-absorbing material 100 is manufactured, for example, by the following method: Prepare a cushioning material layer 6 with a pre-formed anti-slip layer 7. Next, apply the raw material paste of the polymer resin layer 5 manufactured by the method described above to the cushioning material layer 6 using a doctor knife. Next, attach the cushioning material layer 4 to the polymer resin layer 5. Next, apply the raw material paste of the polymer resin layer 2 manufactured by the method described above to the cushioning material layer 4 using a doctor knife. Next, attach the reinforcing material layer 3 to the polymer resin layer 2. Next, attach the surface layer 1 to the reinforcing material layer 3 so that the base fabric layer 12 is facing downwards. Next, place the laminate obtained by attaching the surface layer 1 as described above into a drying oven and perform solidification processing on the raw material pastes of the polymer resin layers 2 and 5. Alternatively, instead of preparing a cushioning material layer 6 with a pre-formed anti-slip layer 7, the anti-slip layer 7 may be formed on the lower surface of the cushioning material layer 6 after performing the solidification processing on the raw material pastes of the polymer resin layers 2 and 5 as described above.

[0037] The raw material pastes for polymer resin layers 2 and 5 are prepared by mixing a polymer resin, such as polyvinyl chloride resin which is the material for the polymer resin layer, with calcium carbonate, a plasticizer, and additives in appropriate proportions in a kiln. For example, if the raw material paste contains polyvinyl chloride resin, the solidification process for each of the raw material pastes for polymer resin layers 2 and 5 is carried out by the following method: The raw material paste is heated in a drying oven. This causes the polyvinyl chloride resin particles to expand, causing them to come into contact with each other, lose fluidity, and gel. During gelation, the polyvinyl chloride resin incorporates the plasticizer and calcium carbonate and becomes integrated. The raw material paste is further heated until it reaches a temperature of 130°C to 180°C, at which point the interfaces between the polyvinyl chloride resin particles disappear and the polyvinyl chloride resin melts. During melting, the polyvinyl chloride resin further incorporates the plasticizer and calcium carbonate. As a result, the raw material paste changes into soft polyvinyl chloride resin and stabilizes. The soft polyvinyl chloride resin is then removed from the drying oven. As a result, the flexible polyvinyl chloride resin hardens and becomes more stable upon cooling.

[0038] [Effects of the embodiment]

[0039] According to this embodiment, since the shock-absorbing material 100 comprises two cushioning layers 4 and 6, the total thickness of the two cushioning layers 4 and 6 can be increased while suppressing the increase in the thickness of each individual cushioning layer 4 or 6. Because the increase in the thickness of each individual cushioning layer 4 or 6 is suppressed, damage to each of the cushioning layers 4 and 6 is prevented, and the stability of the shock-absorbing material 100 is ensured. By increasing the total thickness of the two cushioning layers 4 and 6, it is possible to provide a shock-absorbing material 100 with excellent impact noise reduction capabilities.

[0040] Furthermore, the inventors of this application have set the density of the cushioning material layer 4 to 0.081 g / cm³, which is higher than the density of conventional fused fiber-containing fibrous backing layers. 3 More than 0.100g / cm 3We found that the strength of the cushioning layer 4 is improved by setting the density as follows: providing the two cushioning layers 4 and 6 as described above, and setting the density of the cushioning layer 4 to 0.081 g / cm³. 3 More than 0.100g / cm 3 By setting the density to the following, damage to the cushioning layer 4 can be effectively prevented. Furthermore, the density of the cushioning layer 4 should be 0.081 g / cm³. 3 More than 0.100g / cm 3 The decrease in impact sound reduction performance of the impact-absorbing material 100 due to the following densities can be compensated for by providing two cushioning layers 4 and 6, and by making the thickness of cushioning layer 4 6.5 mm or more.

[0041] [Examples]

[0042] (1) First embodiment

[0043] The inventors of this application prepared the following samples 1 to 3.

[0044] Figure 3 is a table showing the specific materials of the sample in the first embodiment of the present invention.

[0045] Sample 1 (Example of the present invention): The impact-absorbing material 100 shown in Figure 1 was prepared. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 are as shown in Figure 3. The thickness of cushioning layer 4 was set to 6.0 mm, and the thickness of cushioning layer 6 was set to 3.0 mm. The density of cushioning layers 4 and 6 was set to 0.081 g / cm³. 3 That's what I decided.

[0046] Sample 2 (Comparative Example): A sample was prepared by omitting the polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 from the impact-absorbing material 100 shown in Figure 1. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, and cushioning layer 4 are as shown in Figure 3. The thickness of cushioning layer 4 was set to 9.0 mm. The density of cushioning layers 4 and 6 was set to 0.075 g / cm³. 3 That's what I decided.

[0047] Sample 3 (Comparative Example): A sample was prepared by omitting the polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 from the impact-absorbing material 100 shown in Figure 1. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, and cushioning layer 4 are as shown in Figure 3. The thickness of cushioning layer 4 was set to 3.0 mm. The density of cushioning layers 4 and 6 was set to 0.075 g / cm³. 3 That's what I decided.

[0048] Next, the inventors of the present invention evaluated each of the samples 1 to 3 by measuring the lightweight floor impact sound using a standard lightweight impact source (tapping machine) in accordance with JIS (Japanese Industrial Standards) A-1440-1, and estimated the performance of the lightweight floor impact sound reduction performance as an LL grade, which was the old grade (lower values ​​indicate higher performance). For the evaluation, a steel tapping hammer was used and the thickness of the concrete slab was set to 150 mm.

[0049] As a result, samples 1 and 2 each achieved sound insulation performance equivalent to a sound insulation rating of LL35. On the other hand, sample 3 achieved sound insulation performance equivalent to a sound insulation rating of LL45. These results indicate that samples 1 and 2 exhibit superior impact noise reduction compared to sample 3.

[0050] Next, the inventors of the present invention conducted peel strength tests on each of the cushioning material layers 4 of samples 1 and 2 in accordance with JIS L1021-9 (Method B). They measured the maximum force (N) while peeling 50 mm in both directions parallel and perpendicular to the production direction, and evaluated the peel strength (N) as the midpoint of the two measured maximum forces. As a result, sample 1 obtained a peel strength of 39.5 N. On the other hand, sample 2 obtained a peel strength of 22.5 N. The inventors also placed samples 1 and 2 on the floor and walked on each of them. As a result, stable walking was possible on sample 1. On the other hand, with sample 2, wobbling occurred during walking, and a slight instability was felt.

[0051] These results indicate that, compared to sample 2, sample 1 effectively prevented damage to the cushioning layer 4, resulting in improved stability during walking.

[0052] (2) Second embodiment

[0053] The inventors of this application prepared the following samples 12 to 35.

[0054] Samples 12-15 (all examples of the present invention): The impact-absorbing material 100 shown in Figure 1 was prepared. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 are as shown in Figure 3. The thickness of the cushioning layer 6 was set to 3.5 mm, and the density of the cushioning layer 6 was set to 0.100 g / cm³. 3 The following settings were used: The thickness of the cushioning material layer 4 was fixed at 6.5 mm, and the density of the cushioning material layer 4 was set to 0.075 g / cm³. 3 ~0.105 g / cm³ 3 They were set to different values ​​within the range.

[0055] Samples 16-20 (all examples of the present invention): The impact-absorbing material 100 shown in Figure 1 was prepared. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 are as shown in Figure 3. The thickness of the cushioning layer 6 was set to 3.5 mm, and the density of the cushioning layer 6 was set to 0.100 g / cm³. 3 The following settings were used: The thickness of cushioning layer 4 was fixed at 8.0 mm, and the density of cushioning layer 4 was set to 0.075 g / cm³. 3 ~0.105 g / cm³ 3 They were set to different values ​​within the range.

[0056] Samples 21-25 (all examples of the present invention): The impact-absorbing material 100 shown in Figure 1 was prepared. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 are as shown in Figure 3. The thickness of the cushioning layer 6 was set to 3.5 mm, and the density of the cushioning layer 6 was set to 0.100 g / cm³. 3 The following settings were used: The thickness of cushioning layer 4 was fixed at 9.5 mm, and the density of cushioning layer 4 was set to 0.075 g / cm³.3 ~0.105 g / cm³ 3 They were set to different values ​​within the range.

[0057] Samples 26-30 (all examples of the present invention): The impact-absorbing material 100 shown in Figure 1 was prepared. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 are as shown in Figure 3. The thickness of the cushioning layer 6 was set to 3.5 mm, and the density of the cushioning layer 6 was set to 0.100 g / cm³. 3 The density of the cushioning layer 4 was set to 0.081 g / cm³. 3 The cushioning material layer 4 was fixed in place, and its thickness was set to different values ​​within the range of 5.5 mm to 10.5 mm.

[0058] Samples 31-35 (all examples of the present invention): The impact-absorbing material 100 shown in Figure 1 was prepared. The specific materials for each of the surface layer 1, polymer resin layer 2, reinforcing layer 3, cushioning layer 4, polymer resin layer 5, cushioning layer 6, and anti-slip layer 7 are as shown in Figure 3. The thickness of the cushioning layer 6 was set to 3.5 mm, and the density of the cushioning layer 6 was set to 0.100 g / cm³. 3 The density of the cushioning layer 4 was set to 0.100 g / cm³. 3 The cushioning material layer 4 was fixed in place, and its thickness was set to different values ​​within the range of 5.5 mm to 10.5 mm.

[0059] Next, the inventors evaluated the lightweight floor impact sound reduction performance of each of the samples 12 to 35 in the same manner as in the first embodiment, using an LL grade. The inventors also evaluated the peel strength (N) in the same manner as in the first embodiment.

[0060] Figure 4 is a table showing the lightweight floor impact sound reduction performance and peel strength of each of the samples 12 to 35 in the second embodiment of the present invention.

[0061] Referring to Figure 4, we focus on samples 12 to 25. The density of buffer layer 4 is 0.081 g / cm³. 3 ~0.100g / cm 3The lightweight floor impact sound reduction performance of samples 12-14, 17-19, and 22-24, which fall within the specified range, was LL37 or lower. On the other hand, the lightweight floor impact sound reduction performance of samples 15, 20, and 25, which have a density of the cushioning material layer 4 greater than the above range, was LL38 or higher.

[0062] Furthermore, the density of the cushioning layer 4 is 0.081 g / cm³. 3 ~0.100g / cm 3 Compared to the peel strengths of samples 12-14, 17-19, and 22-24, which fall within the specified range, samples 16 and 21, whose buffer layer 4 density is lower than the above range, also exhibited lower peel strengths. This suggests that the density of the buffer layer 4 should be 0.081 g / cm³. 3 ~0.100g / cm 3 It was found that by setting the range accordingly, the lightweight floor impact sound reduction performance and the peel strength of the cushioning material layer 4 could be particularly improved.

[0063] We focused on samples 26 to 35. The lightweight floor impact sound reduction performance of samples 27 to 30 and 32 to 35, where the thickness of the cushioning material layer 4 was 6.5 mm or more, was LL37 or less. On the other hand, the lightweight floor impact sound reduction performance of samples 26 and 31, where the thickness of the cushioning material layer 4 was smaller than the above range, was LL38 or higher. This shows that the lightweight floor impact sound reduction performance can be particularly improved by making the thickness of the cushioning material layer 4 6.5 mm or more.

[0064] [others]

[0065] The shock-absorbing material 100 may be in the form of a carpet rather than tiles. That is, it may be in the form of a single shock-absorbing material 100 covering the entire floor. Alternatively, the shock-absorbing material 100 may be installed on a support material S such as a wall or ceiling instead of on the floor.

[0066] The embodiments and examples described above should be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0067] 1. Surface layer (an example of a surface layer) 2.5 Polymer resin layer (an example of an upper polymer resin layer and a lower polymer resin layer) 3. Reinforcement layer (an example of a reinforcement layer) 4.6 Cushioning layer (an example of an upper cushioning layer and a lower cushioning layer) 7. Anti-slip layer (an example of an anti-slip layer) 11 Pile Layers 12 Base fabric layer 100 Shock-absorbing materials (an example of a shock-absorbing material) S Support material

Claims

1. The surface layer and An upper cushioning material layer provided below the surface layer, A lower polymer resin layer is provided below the upper cushioning material layer, The lower polymer resin layer is provided below the lower cushioning material layer, Each of the upper and lower cushioning layers is an impact-absorbing material containing multiple organic fibers that are intertwined with each other.

2. The impact absorbing material according to claim 1, wherein the density of the lower cushioning layer is higher than the density of the upper cushioning layer.

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