JP2928796B2 - Wooden soundproof flooring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a wooden sound-insulating flooring material, and more specifically, is directly attached to a floor base such as a concrete floor slab with an adhesive or the like in an apartment house or the like. The present invention relates to a wooden soundproof flooring material used for reducing sound.

<Conventional technology> In a multi-family house, a school, a hotel, etc., floor impact sounds such as human walking, falling objects (light impact noise), and children jumping (heavy impact noise) are generated, and these are concrete floor slabs and the like. However, there is a problem that the noise is transmitted to a lower floor room, an adjacent room, or the like through the floor substrate.

Among them, it has been found that the most effective way to improve the heavy floor impact sound is to increase the floor rigidity by increasing the thickness of the concrete floor slab or the like.

On the other hand, in order to prevent or reduce the light floor impact sound, generally, a cushioning material such as a foamed material such as a synthetic resin or a fibrous mat is attached to the back surface of the flooring material such as a wooden material. 2. Description of the Related Art There has been known a construction in which a concrete floor slab or the like is directly constructed on a floor substrate with an adhesive. In addition, by providing such a cushioning material, appropriate cushioning properties can be provided together with soundproofing properties.

<Problems to be Solved by the Invention> By the way, when soundproofing is imparted by providing the above-described cushioning material, when it is desired to increase the soundproofing performance to, for example, light floor impact sound to sound insulation class L-45 or more. In addition, it is necessary to make the thickness of the cushioning material considerably large and to make the material soft.

However, if the cushioning material is made thick and soft, the flooring material becomes too soft, so that the necessary elasticity and load resistance required cannot be obtained. Inconveniences in practical use, such as an increase in deformation due to the deformation, occur.

Also, as described above, the heavy floor impact sound is improved by thickening the concrete floor slab, but providing a soft cushioning material on the back surface of the floor material as described above is disadvantageous for improving the heavy floor impact sound. In addition, the performance of the floor substrate such as a concrete floor slab may be deteriorated.

Therefore, it is currently difficult to simultaneously improve both the heavy floor impact sound and the light floor impact sound.

The present invention solves the above-mentioned problems, and provides an excellent soundproofing performance of a lightweight floor impact sound having a sound insulation rating of L-45 or more, and at the same time, without deteriorating the performance of a floor base such as a concrete floor slab, It is an object of the present invention to provide a wooden soundproof flooring material capable of satisfying a certain strength and a moderate elasticity as a flooring material.

<Means for Solving the Problems> The wooden sound-insulating flooring material of the present invention is obtained by sequentially laminating a viscoelastic damping material, a second wooden material, and a cushioning material on the back side of a first wooden material. The second wood board has a thickness of 40-80.
% Of the cut is engraved in the thickness direction, and the cushioning material has a firing rate of 5 to 30 on the back surface of the fibrous mat having a density of 0.015 to 0.1 g / cm ³ and a recovery rate of 80% or more. The gist of the present invention is that it is a double stick of an independent foam such as a soft synthetic resin.

Instead of the above independent foam, a sheet made of rubber or the like having a hardness of 10 to 60 degrees by a C-type hardness meter specified in JIS K 6301 may be used.

For the first and second wood boards, wood materials such as plywood, fiberboard, and particle board each having a thickness of about 2 to 6 mm are used.

Various veneers or rotary veneers having a thickness of about 0.2 to 1.5 mm are usually adhered to the surface of the first wood board as a decorative material,
In this case, a veneer or the like may be attached to the back surface of the second wooden board as a measure against the warpage of the floor material.

The above-mentioned cuts in the second wood board are for providing a gap in the second wood board to increase the transmission loss of the impact force and thereby reduce the floor impact sound. Further, since the cut area reduces the contact area with the cushioning material provided on the back surface side, the cushioning effect is enhanced, and the floor impact noise is further reduced.

Such cuts may be, for example, gaps formed by saw teeth, or gaps such as cracks and cracks forcibly provided in the wood board by a tenderizer that rolls the wood board at a high pressure by a pair of rollers. This cut also
Usually, it is cut upward from the back surface side of the second wooden board, and is provided with a groove width of about 1 to 3 mm at an appropriate interval, for example, in the vertical direction, the horizontal direction, or the vertical and horizontal directions of the wooden material surface. .

The depth of the cut is, as described above, 40-80% of the thickness of the second wood board. If it is 40% or less, the degree of improvement of the floor impact sound due to the provision of the cuts is small, and it is difficult to achieve the object of the present invention. On the other hand, if it is 80% or more, problems such as warpage and deformation of the floor material occur, and the commercial value is impaired.

In order to further improve the soundproofing effect, the above cut
It is preferable that the contact area between the wooden board and the cushioning material is 90% or less. If the contact area is larger than this, no soundproofing effect can be expected.

On the other hand, the viscoelastic damping material is used to further improve the floor impact sound by absorbing the impact energy by shearing deformation, and is a viscoelastic material such as rubber, asphalt, ethylene rubber, and polyester. A polymer having a thickness of about 0.5 to 5 mm, which is made of a polymer as a main raw material, mixed with a filler and the like and formed into a sheet, is used.

Furthermore, the fibrous mat constituting the cushioning material is a three-dimensionally entangled synthetic fiber made of a synthetic resin such as a polyester resin or an acrylic resin using a flexible adhesive such as a synthetic rubber. Those having a thickness of about 2 to 5 mm are used. If it is less than 2 mm, a sufficient buffer effect cannot be obtained, while 5 mm
In the above, there is a problem in practical use as a floor such that the floor material sinks largely due to the load when furniture is installed and the walking feeling is deteriorated.

When the density of the fibrous mat is 0.015 g / cm ³ or less, the fibrous mat becomes too porous and the resilience is poor, and when a heavy object such as a piano is installed, the fibrous mat is removed even after the heavy object is removed. It remains sinking without being restored. Further, there is a problem in practicality and durability as a floor, such as occurrence of sagging of the fibrous mat due to repeated loads such as walking. When the density is 0.1 g / cm ³ or more, the effect on reduction of the lightweight floor impact sound is small.

Furthermore, if the restoration rate of the fibrous mat is 80% or less, the recovery property when removing heavy loads such as pianos after loading is poor,
Practical problems such as the fact that the portion on which heavy objects are loaded remain sinking and unevenness occurs on the floor surface occur.

The restoration rate is a value measured by a long-term load loading test, and is a value obtained by dividing the recovered fibrous mat thickness after unloading by the fibrous mat thickness before loading.

Further, the above independent foam is an independent foam such as a soft synthetic resin such as polyethylene. The above-mentioned sheet of rubber or the like is a sheet of natural rubber, synthetic rubber or the like. These independent foams or sheets have a thickness of about 2 to 5 mm.

These independent foams or sheets are provided for improving that the weight floor impact sound performance of the floor slab itself is reduced due to the provision of the fibrous mat. A material having a small degree of compression and a cushioning property capable of absorbing an impact force is preferable. Therefore, as an independent foam such as a soft synthetic resin, one having an expansion ratio of 5 to 30 is used. When the expansion ratio is 5 times or less, the cushioning property is insufficient, and the impact force cannot be completely absorbed. If the expansion ratio is 30 or more, the cushioning property is improved, but the degree of compression becomes too large, and the sink of the flooring material becomes large. On the other hand, as a sheet of rubber or the like, JIS K 6301
Those having a hardness of 10 to 60 degrees by a C-type hardness meter specified in the above item are used. If the hardness is more than 60 degrees, it will be too hard and the cushioning property will be poor, and it will not be possible to absorb impact force. On the other hand, if the hardness is 10 degrees or less, the degree of compression is large, and the sinking of the flooring material becomes large, causing problems in practicality.

<Function> By forming the cushioning material provided on the flooring material by sequentially laminating a fibrous mat and a sheet of independent foam or rubber, the lightweight floor impact sound is reduced by the fibrous mat. In addition, the independent floor foam or the sheet of rubber or the like provided on the side of the concrete floor slab or the like directly in contact with the floor substrate can prevent the heavy floor impact sound performance of the concrete floor slab from being reduced.

On the other hand, since the cut is provided in the second wooden board as described above, the vibration energy transmitted to the flooring material is reduced, the buffering effect of the cushioning material is effectively actuated, and the impact from the floor is more effectively blocked. It becomes possible.

And, as described above, the second damping material and notch
Wooden board, fibrous mat, independent foam or sheet of rubber, etc. are combined and laminated. Each layer functions as a shock absorber, and each layer absorbs different strengths. The effect of reducing floor impact noise can be improved.

In addition, by providing a sheet of independent foam or rubber on the side of the concrete floor slab or the like that comes into contact with the floor substrate, it is possible to prevent penetration of resin, moisture, and the like. In addition, the buffering performance of the fibrous mat is prevented from being reduced due to the adhesive penetrating into the fibrous mat and solidifying. Further, since moisture from the floor substrate such as a concrete floor slab is blocked by the independent foam or the sheet of rubber or the like, the moisture does not expose the floor material. Furthermore, even if there is unevenness in the floor base such as a concrete floor slab, the unevenness can be absorbed and the finish after construction can be improved.

<Example> An example will be described below.

1 and 2 show a wooden soundproof flooring material according to an embodiment of the present invention. This flooring is 50x450mm in size and 3.5mm thick
mm on the surface of the first wooden board 1 made of plywood
A decorative veneer 1a composed of a 0.6 mm veneer is stuck. On the back surface of the first wood board 1, a vibration damping material 2 and a second wood board 3 made of a rubber-based viscoelastic polymer compound having a thickness of about 2 mm are sequentially laminated.

The second wooden board 3 has a plywood 31 having a thickness of about 3.6 mm and a veneer 32 having a thickness of 0.6 mm adhered to the back side.

The second wood board 3 has a groove 3a having a depth of 2.5 mm and a width of about 2 mm, which is machined in the thickness direction from the back side with a saw or the like at a pitch of 8 mm in the longitudinal direction and in the transverse direction. Each is formed with a 90mm bitch (contact surface contact rate 78.2
%).

Furthermore, on the back side of the second wooden board, a 2.5 m thick polyester fiber is three-dimensionally entangled with SBR adhesive.
m, density of 0.035 g / cm ³ , 80% restoration rate, and a cushioning material in which a polyethylene independent foam 5 having a foaming ratio of 30 and a thickness of about 3 mm is sequentially laminated and adhered. .

On the other hand, as the cushioning material, polyester fibers
5mm thick, 0.035 density entangled with R adhesive
A wood-based soundproof flooring (Comparative Example 1) having the same configuration as that of the example using a fibrous mat having a restoration rate of 80% of g / cm ³ was produced.

A wooden soundproof flooring material (Comparative Example 2) having the same configuration as that of the example except that a polyethylene independent foam having a thickness of 5 mm and an expansion ratio of 30 was used as the cushioning material was produced.

Furthermore, as a fibrous mat in the examples, a thickness of 2.5 m
A wooden soundproof flooring material of the same configuration (Comparative Example 3) was prepared except that a needle-punched polyester fiber having a m, a density of 0.035 g / cm ³ and a restoration rate of 50% was used.

The above four wooden soundproof floor materials were directly attached to the upper surface of a 150 mm thick concrete floor slab with an epoxy resin adhesive, and the floor impact sound performance according to JIS A-1418 was measured. The results are shown in Tables 1 and 2.

In addition, a load of up to 150 kg was loaded on the above four wooden sound-insulating floor materials with a circular pressure plate having a diameter of 135 mm, unloaded after 30 days, and the recovery rate when a certain thickness was obtained was measured. .
The results are shown in Table 3.

Table 3 Recovery rate of cushioning material ^* Example 89.5% Comparative example 1 80.5% Comparative example 2 96.8% Comparative example 3 75.5% * Recovery rate = (thickness of recovered cushioning material after unloading / cushioning material before loading) Further, when the walking feeling of each of these four wooden soundproof flooring materials was examined, it was found that the examples and comparative examples 3 were slightly soft, comparative examples 1 were too soft, and comparative examples 2 were too soft. Met.

<Effects of the Invention> As described above, according to the present invention, it has a sound insulation performance of light insulation grade L-45 or more for light floor impact sound, and also deteriorates heavy floor impact sound performance of a floor substrate such as a concrete floor slab. Thus, it is possible to provide a woody soundproof flooring material that can satisfy a certain strength and a suitable elasticity as a suitable flooring material.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wooden sound-insulating floor material of an embodiment, and FIG. 2 is a sectional view taken along line AA of FIG. DESCRIPTION OF SYMBOLS 1 ... 1st wood board, 2 ... Damping material, 3 ... 2nd wood board, 4
... fibrous mat, 5 ... independent foam.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04F 15/04 601 E04F 15/18 602

Claims (2)

(57) [Claims] 1. A viscoelastic damping material, a second wood board, and a cushioning material are sequentially laminated on the back side of a first wood board, and the second wood board has a thickness equal to that of the first wood board. A notch with a depth of 40 to 80% is cut in the thickness direction, and the cushioning material has a density of 0.015%.
A wood material characterized in that an independent foam such as a soft synthetic resin having an expansion ratio of 5 to 30 is adhered to the back surface of a fibrous mat having a recovery rate of 80% or more at 0.1 g / cm ³ or more. Soundproof flooring. 2. A sheet according to claim 1, wherein a sheet of rubber or the like having a hardness of 10 to 60 degrees by a C-type hardness meter specified in JIS K 6301 is used in place of said independent foam. Wooden soundproof flooring.