JPH086450B2 - Soundproof flooring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a floor material, and in particular, it is used for an upper floor part of a house, and is a soundproof floor material for preventing solid sound from propagating downstairs due to impact of the floor surface. Regarding

<Prior Art> Examples of this type of soundproof flooring include, for example, a soft high-foaming layer having a foaming ratio of 3 to 10 times and a soft low-foaming layer having an expansion ratio of 1.5 to 3 times on the back surface of the flooring body. Which are sequentially laminated (No. Shokai 50-49917), or a sound insulating foam consisting of a plurality of layers is attached to the entire lower surface of a wooden board, and the foaming ratio of the sound insulating foam in the adjacent layers is different. The one configured as described above (Shokaisho 61-47339) has been proposed. In these soundproof floor materials, a foam is used as a cushioning material, and the foam is subjected to impact to be compressed or deformed, so that the collision time becomes long during the deformation, and a change in momentum, that is, impulse and impact force. Even if the temporal integration area is constant, the peak value of the impact force and the impact natural frequency can be reduced, the impact input energy to the substrate can be reduced, and thus the sound and vibration due to the impact can be reduced. Further, when an impact material such as the foam is bonded to the back surface of the floor material, the shock energy is absorbed by the expansion and contraction deformation of the cushion material caused by the bending vibration of the floor material, thereby providing a cushioning effect.

<Problems to be Solved by the Invention> In order to bring about a sufficient soundproofing effect in these conventional soundproofing floor materials, it is necessary to appropriately set the thickness ratio between the flooring material and the cushioning material. The thickness of the cushioning material is set to 2 to 3 times that of the floor material. However, if the thickness of the cushioning material is set in this way, the bending of the floor material itself becomes large, and the real part of the floor material is damaged or the real part is uneven. Occur. Further, since the cushioning material is too soft, the walking feeling when walking on the floor is deteriorated, and when a heavy load such as a piano, a refrigerator, or furniture is placed and a concentrated load is applied to the flooring material, the cushioning material is cushioned. The material is compressed and its cushioning effect is greatly reduced. Furthermore, when such a large load is applied for a long period of time, the cushioning material itself has a weak restoring force, which causes the floor surface to wavy, resulting in a step at the abutting portion with the adjacent floor material. There was a problem.

<Means for Solving Problems> Therefore, the present invention aims to solve the above problems in the prior art, and to provide a novel soundproofing floor material having excellent soundproofing effect and practically inconvenient. The above-mentioned sheet-shaped cushioning material is formed by adhering and laminating a sheet-shaped cushioning material in which a plurality of cylindrical convex portions are formed on both front and back surfaces at intervals, and the sheet-shaped cushioning material is adhesively laminated on the back surface of the flooring substrate. The soundproof flooring material is characterized in that the positions of the cylindrical convex portions on both the front and back surfaces are formed differently on the front and back surfaces, respectively.

<Detailed Description and Action of the Invention> As the flooring substrate, any plate-like body such as plywood, fiberboard, particle board, and sawn timber is used.

On the surface of the substrate, if necessary, pattern formation printing, veneer sticking, synthetic resin or synthetic resin foam decorative sheet sticking,
Decorative paper, synthetic resin-impregnated decorative paper, or makeup with synthetic paper can be applied.

Actual processing such as phase determination processing and actual processing is performed on the wood edge of the substrate.

On the back surface of the substrate, a sheet-shaped cushioning material having a plurality of convex portions formed on the front and back surfaces thereof is adhered and laminated via an adhesive. If necessary, a non-woven fabric may be interposed and the sheet-shaped cushioning material may be bonded to the substrate.

The sheet-shaped cushioning material is formed of a rubber-based, synthetic resin-based, asphalt-based sheet-shaped material or the like. For example, a polymer obtained by ring-opening polymerization of a norbornene monomer composed of ethylene and cyclopentanediene is used.

The hardness of the buffer material is preferably about 30 to 65 degrees. This is because when it is constructed as a floor if it is less than 30 degrees, sinking is likely to occur due to the load from heavy objects such as pianos, refrigerators, furniture, etc. This is because the energy absorption is not sufficient and the soundproof effect is reduced.

The convex portions formed on both the front and back surfaces of the cushioning material are generally integrally molded as a circular cross-section, but the shape is not limited, and for example, a polygonal prism shape such as a square or a trapezoid,
The shape may be a truncated cone or a pyramid, a hollow cylinder or a prism.

By forming a plurality of convex portions on both the front and back surfaces of the cushioning material in this way, an excellent soundproofing effect can be obtained, and the reason is considered to be as follows. In addition, the mechanism that the solid sound acting on the floor material is particularly perceived by the downstairs is that it is transmitted from the source to the floor material as solid vibration, propagates as vibration in the floor material, and finally into the air. It is emitted as sound or transmitted as vibration to the human body directly, and is sensed by human hearing. To prevent solid sound in this propagation system, buffering, that is, absorption of impact energy, and control are required. It is necessary to consider two factors: vibration, that is, absorption of vibration energy.

First, considering buffering, the impact energy applied to the floor surface (floor material substrate) is propagated from the convex portion of the surface bubble of the sheet-shaped cushioning material joined to the back surface to the convex portion on the back surface side. Since the contact area with the substrate is small and therefore the amount of expansion and contraction deformation per unit area is large, the cushioning effect is better than when the sheet-shaped cushioning material is adhered to the entire surface of the substrate without providing a convex portion. improves. Further, when the impact energy is received due to the provision of the convex portion, the convex portion is bent, so that the deformation amount becomes larger and the viscoelasticity of the sheet-shaped cushioning material itself is effectively exhibited. Further, since the amount of deformation of the sheet-shaped cushioning material is increased in this way, the impact time becomes longer, and thus the impact energy can be reduced. Thus, according to the structure of the present invention, a remarkable cushioning effect can be obtained.

Next, damping is achieved by converting the applied vibrational energy into intermolecular frictional energy while propagating through the material, in other words, converting it into thermal energy and attenuating it. Since the convex portions are formed on both front and back surfaces, the propagation distance of vibration energy becomes longer by that amount, and the conversion into heat energy can be performed more efficiently.

In particular, when the convex portion on the front surface side and the convex portion on the rear surface side of the sheet-shaped cushioning material are formed at different positions, the deflection between the convex portions formed at different positions on the front and back surfaces becomes larger, and the impact energy is increased. In addition to being absorbed more effectively, the propagation of vibrational energy is performed via a zigzag path, which results in a longer propagation distance.
The vibration damping effect can be further improved.

Further, a space formed between the back surface of the floor material substrate and the convex portion on the front surface side of the sheet-shaped cushioning material and between the convex portion on the back surface side of the sheet-shaped cushioning material and the floor base is a sound absorbing chamber. Since it works as, the soundproofing effect is further improved. Further, when the convex portion of the sheet-shaped cushioning material has a hollow cylindrical shape or a rectangular tube shape, the hollow portion of the convex portion is closed by the substrate to form a sealed space, which serves as a sound absorbing chamber and at the same time functions as an air cushion. Also, it can enhance the soundproofing effect.

A known damping sheet (also referred to as a sound insulating sheet) and / or an elastic sheet may be further attached to the back surface side of the sheet-like cushioning material, and the sheet-like cushioning material may be bonded to the floor base through these sheet materials. The vibration damping sheet generally contains synthetic rubber and synthetic resin as main components, and is made of, for example, ethylene propylene rubber (EPDM) and has a rubber hardness of about 60 to 80 degrees, and is made of heavy metal such as iron powder or iron oxide powder. 1-1.2.
Alternatively, the sound insulation is further improved by making the mass more than that. Such a vibration damping sheet absorbs vibration energy to enhance the soundproof effect, and at the same time, provides tensile strength that resists bending of the entire flooring material as a composite. The elastic sheet is, for example, a polyolefin foam having a foaming ratio of 3 to 30 times, and absorbs vibration energy as a second cushioning material to prevent and absorb the occurrence of unevenness, and to provide a proper walking feeling through its elasticity. An effect such as giving is produced. Further, by interposing these sheet materials between the sheet-shaped cushioning material and the floor base such as concrete, the adhesiveness can be improved.

<Embodiment> FIGS. 1 and 2 show a preferred embodiment of a soundproof flooring material according to the present invention. In the drawings, 1 is a floor made of a plate-like body such as plywood, fiber board, particle board and the like. Although it is a material substrate, which is not shown, its surface may be given an arbitrary makeup. A sheet-shaped cushioning material 3 is adhered to the entire surface of the back surface of the substrate 1 via a nonwoven fabric 2.

A plurality of convex portions 4 are formed on both front and back surfaces of the sheet-shaped fiber material 3. In the illustrated embodiment, the formation positions of the convex portions 4 are displaced on the front and back surfaces of the cushioning material 3 without being coincident with each other, that is, the convex portion 4a on the front surface side and the convex portion 4b on the rear surface side are made of the cushioning material. Instead of being formed linearly in cross section, it is formed in a zigzag shape. This state can be fully understood by referring to FIG. 2 showing the cushioning material 3 from the front side. Since the cushioning material 3 is bonded to the substrate 1 and the floor base 5 via the convex portions 4a and 4b on the front and back surfaces, a space portion 6 that functions as a sound absorbing chamber is formed between them.

The flooring material 10 of the present invention comprising the substrate 1 and the sheet-shaped cushioning material 3 and, if necessary, the non-woven fabric 2 disposed between the substrate and the sheet-shaped cushioning material is applied on the floor base 5, and is used as a soundproof flooring material. Used as.

In order to confirm the soundproof effect of the flooring material of the present invention, a test was conducted in the following manner.

Various specimens of the same size were placed on a concrete floor plate of 1818 mm × 2727 mm and thickness of 150 mm, and a light impact test with a tapping machine and a heavy impact test with a bang machine were performed with the center of the upper surface of the specimen as the impact point. It was As a test body, (A) a polymer obtained by ring-opening polymerization of a norbornene monomer composed of ethylene and cyclopentanediene on the back surface of a base material of a 6 mm-thick laminated wood veneer (tensile strength 7 kg / cm ² ( Room temperature), 10% compressive strength 1.2 kg / cm ² , rubber hardness 53 degrees) Adhesive sheet-shaped cushioning material with multiple 2.5 mm high protrusions on the front and back surfaces of 1 mm thickness, and (B) same On the back side of the base material of the laminated wood veneer board, the one made of polyolefin resin foam and the expansion ratio is 10 times and 2 times.
Each layer was prepared by bonding and laminating with a thickness of 3 mm.

The test results of these two types of test bodies are shown in the graph of FIG. In this graph, the light impact test result of the test body (A) is ○-○, and the heavy impact test result is ●.
-Indicated by ●, the result of the light impact test of the test body (B) is △
… △, the result of heavy impact test is shown by ▲… ▲.
As is clear from this graph, the test body (A) which is the material of the present invention satisfies the L-55 level in all frequency ranges not only for heavy impact but also for impact sound due to light impact. On the other hand, the test piece (B), which is a comparative material, stays at a much lower level than this, and the result of the light impact test, which is close to the impact sound that frequently occurs in general life, is the level of L-60. Is less than that. Therefore, it was confirmed from the test results that the flooring material of the present invention exhibits a very remarkable soundproofing effect.

Further, "SR-1130" (Saitama Rubber Industry Co., Ltd.) having a hardness of 70 degrees is adhered to the back surface of the sheet-shaped cushioning material of the test body (A), and instead of the vibration damping sheet. A similar test was performed using an elastic sheet to which "Lion Board F Grade" (Lion Co., Ltd.) having a 10% compressive strength of 1.2 kg / cm ² and a pulling strength of 7.0 kg / cm ² at room temperature was adhered. In any case, in the light-weight impact test, a result superior to that of the test body (A) in the octave band center frequency of 63 to 500 Hz by 1 to 2 dB was obtained, and these damping sheets or elastic sheets were bonded. It was thus confirmed that the soundproofing effect was further improved.

<Effects of the Invention> According to the present invention, a flooring material having an extremely excellent soundproofing effect can be obtained, and this flooring material has a simple structure and can be manufactured at low cost by using a material which has been commercially available in the past. .
Further, since the sheet-shaped cushioning material used for the flooring material of the present invention has an appropriate hardness, it does not give an unpleasant walking feeling when used as a flooring material.

[Brief description of drawings]

1 is a sectional view showing the structure of a soundproof flooring according to an embodiment of the present invention, FIG. 2 is a plan view showing a sheet-like cushioning material used for the flooring of FIG. 1, and FIG. 3 is according to the present invention. It is a graph which shows the soundproofing effect of a floor material in comparison with the conventional floor material. Explanation of symbols 1 ... Substrate, 2 ... Non-woven fabric, 3 ... Sheet cushioning material, 4,
4a, 4b …… Convex part, 5 …… Floor base, 6 …… Soundproof room, 10 ……
Flooring

Claims (1)

[Claims] 1. A sheet-shaped cushioning material, in which a plurality of cylindrical convex portions are formed on both front and back surfaces at intervals, is adhered and laminated on the back surface of a flooring substrate, and the above-mentioned front and back surfaces of the sheet-shaped cushioning material on both sides. A soundproof flooring material, in which the positions of the cylindrical convex portions are formed differently on the front and back surfaces, respectively.