JPH07107325B2 - Soundproof flooring - Google Patents

Description

TECHNICAL FIELD The present invention relates to a floor material, and more particularly to a soundproof floor material which is used in an upper floor portion of a house to prevent solid sound from propagating downstairs due to impact of the floor surface. .

<Prior Art> Examples of this kind of soundproof flooring material include 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 floor material 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 integrated value 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 a cushioning material such as the foam is bonded to the back surface of the flooring material, the shock energy is absorbed by the expansion and contraction deformation of the cushioning material caused by the bending vibration of the flooring material, thereby providing a cushioning effect.

<Problems to be Solved by the Invention> In order to provide 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. Used as a thickness of 2 to 3 times the material. However, if the thickness of the cushioning material is set in this way, the flexure of the floor material itself becomes large, and the actual portion of the floor material is damaged or the solid portion is uneven. 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 solves the above problems in the prior art, and provides a novel soundproofing floor material that is excellent in soundproofing effect, has excellent walking feeling, and does not cause practical inconvenience. The present invention was created for the purpose of providing a floor material substrate, and a continuous convex portion is formed on each of the front and back surfaces of the floor material substrate that is adhered to the back surface of the floor material substrate and is surrounded by the continuous convex portion. A sheet-shaped cushioning material in which a plurality of closed spaces are independently formed, a damping sheet bonded to the back surface of the sheet-shaped cushioning material, and an elastic sheet bonded to the back surface of the damping sheet. It is a soundproof flooring material characterized by being made. The position of the hollow closed space on the front and back of the sheet-shaped cushioning material is preferably,
The front and back surfaces are formed to be different from each other.

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

On the surface of the substrate, optional makeup such as pattern printing, veneer sticking, synthetic resin or synthetic resin foam decorative sheet sticking, decorative paper or synthetic resin-impregnated decorative paper or decorative synthetic paper sticking may be applied to the surface of the substrate. it can.

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

On the back surface of such a substrate, a sheet-shaped cushioning material having continuous convex portions 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 monomer 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 if it is less than 30 degrees when it is constructed as a floor, sinking is likely to occur due to the load from heavy objects such as piano, refrigerator and furniture, and if it is rigid enough to exceed 65 degrees, impact force This is because the energy absorption of is not sufficient and the soundproof effect is reduced.

Continuous bumps are formed on both front and back surfaces of the cushioning material, and a plurality of closed spaces surrounded by the continuous bumps are independently formed. The cross-sectional shape of the closed space is not limited, and for example,
A closed space with a regular hexagonal cross section surrounded by multiple convex parts that are continuous like a honeycomb, or multiple closed spaces with a rectangular cross section surrounded by convex parts that are continuous in a grid or block shape. It may be formed by.

In this way, by forming continuous convex portions on both front and back surfaces of the cushioning material and independently forming a plurality of closed spaces surrounded by the convex portions, an excellent soundproofing effect can be obtained.
The reason is considered to be as follows. The mechanism by which the solid sound acting on the floor material is particularly perceived by humans downstairs is that it is transmitted to the floor material as solid vibration from the source, propagates as vibration in the floor material, and finally into the air. Is transmitted as vibrations directly to the human body and is sensed by human hearing. To prevent solid sound in this transmission system, buffering, that is, absorbing shock energy, and damping That is, absorbing vibrational energy requires two factors to be considered.

First, considering buffering, the impact energy applied to the floor surface (floor material substrate) is propagated from the convex portion on the front surface side of the sheet-shaped cushioning material joined to the rear surface to the convex portion on the rear 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 portions, the convex portions are 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 is lengthened accordingly, 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 closed space on the front surface side and the closed space on the back surface side of the sheet-shaped cushioning material are formed at different positions, the bending of the convex portions surrounding the closed spaces formed at different positions on the front and back surfaces becomes larger. The shock energy can be absorbed more effectively, and the propagation of the vibration energy is performed through the zigzag path, so that the propagation distance becomes longer, so that the vibration damping effect can be further improved.

In addition to these effects, in the present invention, continuous convex portions are formed on both front and back surfaces of the sheet-shaped cushioning material, and a plurality of closed spaces surrounded by the continuous convex portions are independently formed, Since each inner space of the convex portion is closed by the upper substrate and the vibration damping sheet of the lower layer to form an independent closed space, the closed space functions as a sound absorbing chamber and at the same time functions as an air cushion. In the present invention, the damping sheet and the elastic sheet are further laminated and adhered to the back surface of the sheet-shaped cushioning material, and the sheet-shaped cushioning material is adhered to the floor base through these sheet materials. Known materials can be used as the vibration damping sheet and the elastic sheet itself. The vibration damping sheet generally contains synthetic rubber and synthetic resin as main components, for example, ethylene.
It is made of propylene rubber (EPDM) and has a rubber hardness of about 60 to 80 degrees, and heavy substances such as iron powder and iron oxide powder are mixed to make it a mass of 1 to 1.2 or more and improve sound insulation. Sometimes the called material is called a sound insulation sheet.
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.
Prevents and absorbs the occurrence of unevenness and, through its elasticity, gives an appropriate walking feeling. Further, by interposing these sheet materials between the sheet-shaped cushioning material and the floor base such as concrete, the adhesiveness can be improved.

<Example> FIG. 1 and FIG. 2 show a preferred example of the soundproof flooring material according to the present invention. In the figure, reference numeral 1 denotes a flooring substrate made of a plate-like body such as plywood, fiber board, particle board, and the like, which is not shown in the drawing, but may have its surface optionally coated. 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.

The convex portions 4 are continuously formed on both front and back surfaces of the sheet-shaped cushioning material 3. In the illustrated embodiment, it is formed in a substantially honeycomb shape so as to provide a plurality of independent closed spaces 6 each having a regular hexagonal cross section (see FIG. 2) between the continuous front surface side convex portion 4a and back surface side convex portion 4b. However, the positions of the independent closed spaces on the front and back surfaces are different from each other (see FIG. 1).

As the floor material, the cushioning material 3 is the convex portions 4a, 4b on the front and back surfaces.
When the upper substrate 1 and the lower vibration damping sheet 5 are bonded to each other through the above, a closed space portion 8 acting as a sound absorbing chamber is provided between them.
Are independently formed inside the convex portion 4.

The shape of the plurality of closed spaces 6 which are independently formed by being surrounded by the continuous convex portions 4a and 4b on the front and back surfaces of the cushioning material 3 are not necessarily limited to regular hexagons, as illustrated in FIG. It can have various shapes.

The damping sheet 5 is bonded to the back surface of the sheet-shaped cushioning material 3 via the lower surface of the convex portion 4b, and the elastic sheet 6 is bonded to the entire back surface of the damping sheet 5.

The floor material 10 of the present invention comprising a substrate 1, a sheet-shaped cushioning material 3, a vibration damping sheet 5 and an elastic sheet 6, and a nonwoven fabric 2 arranged between these substrate and sheet-shaped cushioning material is a floor substrate. It is installed on 7 and used as a soundproof floor material.

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

On a 1818mm × 2727mm, 150mm thick concrete floorboard,
Various test pieces of the same size were placed, 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 test piece as a hitting point. 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 ( Normal temperature), 10% compressive strength 1.2 kg / cm ² , rubber hardness 53 degrees) A sheet with regular hexagonal continuous protrusions 2.5 mm in height on both sides of 1 mm thick, formed in a honeycomb shape as shown in Fig. 2. -Shaped cushioning material is bonded, and "SR-1130" (Saitama Rubber Industry Co., Ltd.) with a hardness of 70 degrees and a thickness of 1 mm is bonded as a damping sheet to the back surface of the sheet-shaped cushioning material, and further on the entire back surface. ,
An elastic sheet with a 10% compressive strength of 1.2 kg / cm ² , a tensile strength of 7.0 kg / cm ² at room temperature, and a thickness of 2 mm, "Lion Board F Grade" (Lion Co., Ltd.),
And (B) on the back surface of the base material of the same laminated wood veneer, made of a polyolefin resin foam and having a foaming ratio of 10 times and 2
A double layer was prepared by adhesively laminating two layers of 4.5 mm each.

The test results of these two types of test bodies are shown in the graph of FIG. In this graph, the result of the light impact test of the test body (A) is ○-○, and the result of the heavy impact test is ●-.
It is indicated by ●, and the result of the light impact test of the test body (B) is △…
△, the results of the heavy impact test are 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 noise due to light impact. The test piece (B), which is a comparative material, has a much lower level than this, and the results of the light impact test, which is close to the impact sound that frequently occurs in general life, reach the L-60 level. It 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.

<Effect of the Invention> According to the present invention, a flooring material having an extremely excellent soundproofing effect can be obtained.
Moreover, this flooring material has a simple structure and can be manufactured at low cost using materials that have been commercially available in the past. Further, the sheet-shaped cushioning material used for the flooring material of the present invention has an appropriate hardness, and furthermore, the presence of the closed space due to the formation of the continuous convex portion provides a cushioning action, and further the elastic sheet is bonded as the lowermost layer. Therefore, it has excellent walking feeling when used as a floor material.

[Brief description of drawings]

FIG. 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 in FIG. 1, and FIG. 3 is a sheet-like cushioning. FIG. 4 is an explanatory view showing a slight modification of the shape and arrangement of the convex portions in the material, and FIG. 4 is a graph showing the soundproofing effect of the floor material according to the present invention in comparison with the conventional floor material. Explanation of symbols 1 ... Substrate, 2 ... Nonwoven fabric, 3 ... Sheet-shaped cushioning material 4,4a, 4b ... Convex portion, 5 ... Damping sheet 6 ... Elastic sheet, 7 ... Floor base, 8 ... … Soundproof room 10… Floor material

Claims (2)

[Claims] 1. A flooring material substrate, a convex portion which is adhered to the back surface of the flooring material substrate and is continuous on both front and back surfaces thereof, and a plurality of closed spaces surrounded by the continuous convex portions are independently formed. A soundproof floor material comprising: a sheet-shaped cushioning material, a vibration-damping sheet bonded to the back surface of the sheet-shaped cushioning material, and an elastic sheet bonded to the back surface of the vibration-damping sheet. . 2. The soundproof floor board according to claim 1, wherein the positions of the closed spaces on the front and back surfaces of the sheet-like cushioning material are different on the front and back surfaces, respectively.