JPS63318341A - Vibration absorbing sheet - Google Patents

Abstract

PURPOSE:To increase vibration-absorbing and shock-insulating effects by forming plural convex parts on both front and rear faces of a buffer material made of a low material of hardness as much as 30-65 deg.. CONSTITUTION:A sheet-shaped buffer material 3 is formed by a sheet-shaped material made of rubber, synthetic resin, etc. using a law material of hardness as much as 30-65 deg.. Plural convex parts of circular, rectangular cross-section are formed on both front and rear faces of the sheet-shaped buffer material. In the contruction, the energy of vibration, shock, etc. applied to a floor face is transmitted from a convex part 2a on the surface of the sheet-shaped buffer material joined on the rear face of the floor face to a convex part 2b on the rear face of the floor face. In this case, because the area in which the buffer material contacts the floor face is small, the amount of deformation due to expansion and contraction per unit area becomes larger, and the amount of transmitted vibration is reduced.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a vibration isolating sheet, which can be used particularly in the upper floors of a house to prevent solid sound from propagating to the lower floors due to impact from the floor. Regarding anti-vibration sheets.

<Prior art> Various types of sheet materials of this type have been proposed and provided on the market under the names of vibration-proof sheets, vibration-damping sheets, sound-proof sheets, etc. (Hereinafter in this book, the term "vibration-proof sheet" will be In these cases, foam is used as an MWR material in the soil, and the foam is compressed or deformed by impact, so the collision time becomes longer during the deformation, and the momentum decreases. The change in impulse, II! ! 2 Even if the time integral value of the force is constant, it reduces the peak value of t* impact force and the shock natural frequency, reduces the impact input energy to the board, and thereby reduces the sound and vibration caused by the impact. be. In addition, when the tX street material such as the foam is attached to the back side of the flooring material of a house6, the impact energy is absorbed by the expansion and contraction deformation of the wI shock material caused by the bending vibration of the floor material, and it acts as a buffer. be.

<Problems to be solved by the invention - Sufficient soundproofing and
In order to provide a vibration-proofing effect, the thickness of the vibration-proofing sheet I- needs to be appropriately set in relation to the flooring material, and is generally used as being two to three times as thick as the flooring material. However, with such thickness! When a 1m material is attached to the back side of a flooring material, the flexure of the flooring material itself becomes too large, and the real part of the flooring material may be damaged or uneven.

In addition, since the cushioning material is too soft, the feeling of walking on the floor deteriorates, and furthermore, heavy objects such as pianos, refrigerators, furniture, etc. are placed on the flooring material, and a concentrated load is applied to the flooring material. If this happens, the cushioning material will be compressed, and its cushioning effect will be significantly reduced.6Furthermore, if such a large load is applied over a long period of time, the resilience of the Sakuragai material itself will be weakened. There were problems such as the floor surface being wavy, and differences in level occurring where the floor material meets adjacent floor materials.

Therefore, the present invention solves the above-mentioned problems in the prior art, has excellent vibration-proofing and sound-proofing effects, and is also good when used by pasting it on the back side of flooring materials. This anti-vibration sheet was devised for the purpose of providing a new anti-vibration sheet that provides a comfortable walking sensation, and is characterized by being made of a sheet-like cushioning material with a plurality of convex portions formed on both the front and back surfaces. It is a sheet.

Preferably, the positions of the convex portions formed on the front and back surfaces of the sheet-like cushioning material are different from each other on the front and back surfaces.

The sheet-like 117% material is formed from a sheet-like material of rubber, synthetic resin, asphalt, etc. 9 For example, a polymer obtained by ring-opening a norbornene monomer consisting of ethylene and cyclopentanediene is preferably used. It will be done.

The hardness of the material of the cushioning material is preferably about 30 to 65 degrees. If the rigidity is less than 30 degrees, it will likely sink due to the load from heavy objects such as pianos, refrigerators, and furniture when installed on the back side of the flooring, and if the rigidity exceeds 65 degrees, This is because the impact energy is not absorbed sufficiently, reducing the soundproofing effect.

The plurality of convex portions formed on both the front and back surfaces of the cushioning material are integrally formed with a circular cross section, but the shape is not limited, and may be, for example, a polygonal prism shape such as a rectangular or trapezoidal cross section, or a truncated shape. The shape may be a conical head, a pyramid, a hollow cylinder, a rectangular cylinder, or the like.

As described above, the vibration-proofing sheet of the present invention in which a plurality of convex portions are formed on both the front and back surfaces of the cushioning material can provide excellent vibration-proofing and sound-proofing effects, and the reasons thereof are believed to be as follows. The mechanism by which solid sound acting on flooring materials is sensed by people downstairs is that the sound is transmitted from the source to the flooring materials as solid vibrations, propagates through the flooring materials as vibrations, and finally emits sound into the air. It is radiated as vibration, or directly transmitted to the human body as vibration, and is sensed by the human hearing.In order to stop solid sound in this propagation system, a buffer, that is, P
It is necessary to consider two factors: absorbing R impact energy and damping, that is, absorbing vibration energy.

In terms of shock absorption, the impact energy applied to the floor is propagated from the convex part on the front side of the street material to the convex part on the back side of the sheet-like anti-vibration sheet #yi attached to the back side. However, the contact area with the flooring material is small, and therefore the expansion and contraction deformation per unit area is large, so if the sheet-like cushioning material is bonded to the entire surface of the flooring material without providing a convex portion, Compared to this, the buffering effect is improved. Further, by providing the convex portions, when impact energy is applied, flexure occurs between the convex portions, so that the amount of deformation becomes larger, and the viscoelasticity of the sheet-like cushioning material itself is effectively exhibited. Furthermore, since the deformation of the sheet-shaped (ff) street material increases in this way, the impact time becomes correspondingly longer, thereby making it possible to reduce the impact energy. Thus, if the anti-vibration sheet of the present invention is used by pasting it on the back surface of the flooring material, a significant [fi]
Effects can be obtained.

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

In particular, if the front and back side protrusions of the sheet-like cushioning material are formed so that their positions are aligned with each other, the deflection between the protrusions formed at different positions on the front and back surfaces becomes larger, causing an impact. In addition to absorbing energy more effectively, the vibration energy is propagated through a zigzag path, resulting in a longer propagation distance, making it possible to improve the vibration damping effect.

Furthermore, the space formed between the back surface of the flooring substrate and the convex part on the front side of the sheet-like material, and between the convex part on the back side of the sheet-like cushioning material and the flooring material is sound-absorbing. Since it acts as a room, the soundproofing effect is further improved.

In addition, when the convex part of the sheet-like cushioning material is formed into a hollow cylindrical shape or a rectangular cylinder shape, the hollow part of the convex part is closed by the substrate to form a sealed space, which acts as a sound absorption chamber and at the same time functions as an air cushion. It also serves to further enhance the soundproofing effect.

In addition, a known damping sheet (also called a sound insulation sheet) and/or an elastic seal is further attached to the back side of the 1fFi material (sheet-like), and it is bonded to the flooring through these sheet materials. Good too. Damping sheets generally have synthetic rubber and synthetic resin as their main components, such as ethylene propylene rubber (EPDM), and have a rubber hardness of 60 to 80.
There are also products that are mixed with heavy materials such as iron powder and iron oxide powder to make a volume of 1 to 1.2 or more L for better sound insulation. . Such a damping sheet absorbs vibration energy and improves the soundproofing effect, while increasing the tensile strength of the composite flooring material to resist bending. In addition, the elastic sheet is, for example, a polyolefin foam with an expansion ratio of 3 to 30 times, and as a second tJffl material, it absorbs vibration energy, prevents and absorbs unevenness, and provides a suitable walking feeling through its elasticity. produce an effect such as giving. In addition, by interposing these sheet materials in the shape of a seam between the member and a flooring such as concrete 1, the adhesion can be improved.

<Example> FIG. 1 is a plan view showing a preferred example of the vibration-proof sheet of the present invention. This anti-vibration sheet 1 has a plurality of convex portions 2 on its surface.
a, 2a..., but also a plurality of convex portions 2t+, 2b on the back side
. . is a sheet-like material ['FFr material 3] having convex steps. In this embodiment, convex portions 2a, 2a, . . . and 2b, 2b, .
The protrusions 2a, 2m, . . . on the front side and the protrusions 2b on the back side are formed with different positions.

2b... are not formed linearly in the cross section of the sheet-like cushioning material 3, but are formed displaced in a zigzag shape.

FIG. 2 is a sectional view showing a specific example of the vibration-proof sheet 1 shown in FIG. 1 applied to a floor surface. That is, the vibration isolating sheet 1 is pasted on the floor base 4, the nonwoven fabric 5 is interposed as necessary, and the flooring material 6 is constructed. The sheet-like cushioning material 3 of the anti-vibration sheet 1 has convex portions 2a, 2a... and 2b, 21+ on its front and back surfaces.
Because it is in contact with the flooring 6 and the flooring 4 through..., there is a space 7 between them as a sound absorption room.
is formed.

In this way, the floor surface constructed using the anti-vibration sheet of the present invention has excellent sound-insulating and anti-vibration effects.
The walking feeling was also good.

<Effects of the Invention> According to the present invention, a vibration isolating sheet capable of exhibiting excellent soundproofing and vibration isolating effects is obtained, and this vibration isolating sheet has a simple structure and can be manufactured using conventionally commercially available materials. It can be manufactured at a low cost, and the desired effect can be achieved simply by pasting it on a flooring or the like. Furthermore, since the sheet-like cushioning material used in the vibration-proof sheet of the present invention has appropriate hardness, it does not give an unpleasant walking feeling when the flooring material I\ is installed.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a vibration isolating sheet according to an embodiment of the present invention, and 21"iff is a sectional view showing a floor surface constructed using the vibration isolating sheet of FIG. 1. Explanation of symbols 1 ... Anti-vibration sheet 2a, 2a: 2b, 2b... Convex portion 3... Sheet-like 12 street material

Claims (2)

[Claims] (1) A vibration-proofing sheet characterized by being made of a sheet-like cushioning material having a plurality of convex portions formed on both the front and back surfaces. (2) The vibration isolating sheet according to claim 1, wherein the positions of the convex portions on both the front and back surfaces of the sheet-like cushioning material are different from each other on the front and back surfaces.