JPH0633580A - Cushioning sheet and soundproof floor material using the same - Google Patents

Abstract

PURPOSE:To provide compression resistance and shock absorbing property so as to reduce floor impulsive sound extending over the whole frequency region. CONSTITUTION:This soundproof floor material is constituted so that slits 5 are provided on one face of a plywood layer 2 composed of a decorative plywood 3 and a base material plywood 4, a cushioning sheet 6 is stuck on the face having the slits 5, the inner face side 7 of the cushioning sheet 6 is provided with recessed parts 9 recessed from a reference plane 8 and bonding parts 10 projecting from the reference plane 8 and contacting with the plywood layer 2, and meanwhile the outer face side 15 is provided with projecting seat parts 19 contacting with a bed face on the top parts of protruded parts 17. The protruded part 17 is positioned on the same position as that of the recessed part 9 on the inner face side 7, and the inner face side 7 and the outer face side 15 are respectively provided with air passages 13 for communication of air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning sheet and a soundproofing floor material using the cushioning sheet, which is laid on the floor of an apartment house, a hotel or the like and has improved vibration damping, soundproofing and cushioning properties. Regarding soundproof flooring materials.

[0002]

2. Description of the Related Art Today, impact vibrations from the upper floors of apartments, such as footsteps of people directly stimulating the floor, vibrate or impact solids such as floor materials and bend them. Waves are said to propagate through solids and release in rooms downstairs. In order to improve such impact vibration noise, there is a method of reducing the impact force applied to the floor with a soft finishing material, or a method of increasing the bending rigidity and mass of the floor to make the floor structure less likely to vibrate. The former method is effective for light impact sound, for example, there is a method of laying a carpet or a cushion sheet on a concrete base material, and the latter method is effective for heavy impact sound, for example, concrete. The thickness of the slab is being studied.

However, today, heavy impact sound is influenced by the structure of the building structure, such as the thickness of the concrete slab, regardless of the type of floor material, so many improvements have been made to the lightweight impact sound, and various floor materials have been developed. Has been done. For example, Japanese Patent Publication Sho 5
The soundproofing floor material disclosed in Japanese Patent Laid-Open No. 6-23509 has a three-layer structure of an elastic molded plate, a floor base material, and a floor finish material, and the individual divided floor base materials are laid without making contact with each other. The pieces are acoustically independent. As a floor material having a four-layer structure, for example, a finishing material having a through hole or a semi-through slit provided on a cushioning material, a flexible thin plate, and a wooden floor decorative board are sequentially laminated. -15647
It is disclosed in Japanese Patent Publication No.

On the other hand, today, attempts are being made to improve the layer structure of flooring materials and the materials constituting them. Among them, as the cushioning material, an inorganic fiber board such as glass wool or rock wool, or an organic foam such as polyethylene, ethylene-vinyl acetate copolymer, polyurethane or polyethylene is used. However, the smaller the hardness of the cushioning material is, the more effective it is to prevent floor impact noise, but on the other hand, when a load is applied from the floor, the compressive deformation becomes large, and in some cases, it cannot be actually used. A thickness of at least 10 mm is required to maintain compression resistance and shock absorption.

[0005]

However, although the soundproofing flooring material using the decorative plywood has some sound insulation effect, it is desired that it exhibits the sound insulation effect over the entire frequency range, especially in the low frequency range. It is rare. At present, there are no floor materials that satisfy this requirement. On the other hand, the cushioning material required a thickness of at least 10 mm or more in order to satisfy both shock absorption and compression resistance, but this increased the total thickness of the flooring material and restricted the floor height of the building. I was giving. Further, when the thickness of the cushioning material is 10 mm or more, there is also a problem that the cost increases. The present invention improves such a point, and provides a cushioning sheet which has a shock resistance as well as a compression resistance and has a reduced floor impact sound level over the entire frequency range, and a soundproof floor material using the same. The purpose is to

[0006]

In order to achieve the above object, the cushioning sheet adhered to the soundproof flooring material of the present invention is
One surface of the cushioning sheet has a recessed portion that is recessed from the reference surface and an adhesive portion that protrudes from the reference surface, and the other surface has a seat portion at the top of the raised portion, and the raised portion is Air passages are formed at the same positions as the recesses, and both surfaces have air passages communicating with the air therein. Further, the soundproofing flooring material of the present invention is provided with a slit on one surface of a plywood layer consisting of a decorative plywood and a base material plywood, and has a structure in which a buffer sheet is attached to the surface having the slit, and the inner surface side of the buffer sheet is It has a recessed portion that is recessed from the reference surface and an adhesive portion that protrudes from the reference surface and is in contact with the plywood layer, and on the other hand, a seat portion whose outer surface side is in contact with the base surface is provided at the top of the raised portion, and the raised portion is Air passages are formed at the same positions as the recesses on the inner surface side, and on the inner surface side and the outer surface side, respectively, for communicating the air present therein. Further, the seat portion provided on the top of the raised portion may be a protruding body.

The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of a soundproof flooring material according to the present invention. The soundproofing floor material 1 includes a decorative plywood 3 and a base plywood 4 having slits 5.
And a slit 5 of the base plywood 4
The buffer sheet 6 is sequentially laminated on the surface provided with. The buffer sheet 6 has an inner surface side 7
As shown in FIG. 3, it has concave portions 9 that are recessed from the reference surface 8 and adhesive portions 10 that protrude from the reference surface 8 and contact the plywood layer. The concave portions 9 and the adhesive portions 10 are regularly arranged in a grid pattern. There is. The adhesive portion 10 is composed of a core portion 11 and a concentric ring portion 12 surrounding the core portion 11. The ring portion 12 adjusts the adhesive force between the cushioning sheet 6 and the base material plywood 4, and at the same time, the core portion 1
1 is reinforced and the cushioning property of the cushioning sheet 6 is improved. An air passage 13 is formed between the adhesive portions 10. This allows the air contained in each recess 9 to communicate with the other recesses 9, thereby improving the cushioning property of the cushioning sheet 6.

On the other hand, the outer surface side 15 of the buffer sheet 6, that is, the surface in contact with the base surface 18, has a reference surface 1 as shown in FIG.
The ridges 17 protruding from 6 are regularly arranged in a grid pattern, and a seat portion 19 in contact with the base surface 18 is provided on the top of the ridges 17. The seat portion 19 is a protruding cylindrical body or rod-shaped body, and is designed so that the contact area with the base surface 18 is small, and the other areas are made to land on the base surface 18 to communicate air. There is. Moreover, the seat portion 19 is configured to secure the air passage 13 so that the soundproofness does not deteriorate even when the cushioning sheet 6 receives a load.

As described above, the cushioning sheet 6 has the inner surface 7
Therefore, the impact sound propagating from the base material plywood 4 is reduced because the base material plywood 4 is locally bonded to the base material plywood 4 and the outer surface side is in contact with the base surface 11 only by the seat portion 19 provided on the top of the raised portion 17. It is difficult to reach the ground 18 directly. Moreover,
Since the air passage 13 is formed on the inner surface side 7 and the outer surface side 15 of the cushioning sheet 6 for communicating the air contained therein, a cushioning property as well as a large amount of the air contained therein absorbs impact noise. There is also an effect to do. Of course,
The buffer sheet 6 is made of rubber such as NR, SBR, EPDM,
Alternatively, since it is an elastomer such as urethane, it also has an effect of partially absorbing and damping impact sound.

In the present invention, the contact area ratio of the cushioning sheet 6 to the lower ground 18 and the contact area ratio of the base material plywood 4 are
The area occupied by the seat portion 19 or the adhesive portion 10 provided on the top of the raised portion is divided by the surface area of the base plywood 4. Usually, the ground contact area ratio of the seat portion 19 is up to 10%, while the ground contact area ratio of the adhesive portion 10 is up to 20%. If it exceeds this, the impact sound is easily propagated from the base plywood 4 to the base surface 11, and the soundproofness is poor. In particular, the ground contact area ratio of the seat portion 19 affects the soundproof performance. The buffer sheet 6 has a thickness of about 0.2 to 2.5 mm.

The plywood layer 2 used here has a thickness of 6-10.
In mm, it is composed of a laminated body of the decorative plywood 3 and the base plywood 4 having the slits 5, or the base plywood 4 having the slits 5. These materials are made of beech, chive, lauan, and the like. Further, it is preferable that the slits 5 provided in the base plywood 4 communicate with each other in order to emit and diffuse the impact sound, and the area occupancy rate is 10 to 60%.

Further, in the soundproof flooring 1, a damping sheet 20 is interposed between the decorative plywood 3 and the base plywood 4 having the slits 5, and the cushioning sheet 6 is provided on the surface of the base plywood 4 having the slits. Are sequentially laminated. The vibration damping sheet 20 is a rubber-based foam, an olefin-based foam, or a urethane-based foam.

On the other hand, the soundproof flooring 1 shown in FIG.
The foam layer 21 is interposed between the cushioning sheet 6 and the cushioning sheet 6 to provide more cushioning. The foam layer 21 used here is a polyolefin-based copolymer such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), and ethylene-methyl methacrylate copolymer (EMMA). A polymer, polyurethane, a foam having closed cells of rubber, or a general inorganic filler added, and particularly preferably 100 parts by weight of the polymer containing aluminum hydroxide, magnesium hydroxide or mica as an inorganic filler. 5 to 200 parts by weight of the composition, or 100 parts by weight of flexible polyurethane and 3 to 30 parts by weight of mica are added, and foaming having cross-linking closed cells with an expansion ratio of about 5 to 30. It is the body. The foam layer has a thickness of 2 to 10 mm. A pattern such as grain may be provided on the surface of the foam layer 21. Of course, a fibrous member such as a non-woven fabric may be used instead of the foam layer 21.

[0014]

According to the present invention, the inner surface side 7 of the cushioning sheet 6 is locally joined to the base plywood 4, while the outer surface side 15 has the seat portion 19 provided on the top of the hollow raised portion 17 and the base surface 18. Air passage 1 which is in contact with
3 is formed, the impact sound propagating from the base plywood 4 is hard to be directly transmitted to the base surface 18, and the impact sound is partially absorbed and attenuated, and the cushioning property and the compression resistance are provided. Improve. Moreover, in the present invention, since the seat portion 19 provided on the top of the raised portion 17 projects and the area in contact with the base surface 18 is limited to a small size, the impact sound further propagating from the base plywood 4 is directly applied to the base surface 18. It is difficult to communicate.

[0015]

EXAMPLES Next, specific examples of the soundproof flooring material of the present invention will be described in detail. Example 1 2.5 mm thick decorative plywood, 1.5 mm thick damping sheet (natural / SBR rubber foam), 5.5 mm thick base plywood (6 plies with slits with 28% occupancy) 1) and a cushioning rubber sheet having a thickness of 1 mm were sequentially laminated to obtain a soundproof flooring material shown in FIG. The buffer sheet is shown in Table 1.
After a sheet having a thickness of 1 mm was prepared using the rubber compound shown in 1), it was placed in a lower mold provided with a hemispherical ridge, and then an upper mold having substantially the same shape was covered, and the mold 153 ° C.
It was left for 10 minutes for vulcanization. The obtained cushioning sheet has the same pattern as that shown in FIGS. 3 and 4, the protruding amount of the seat portion provided on the top of the raised portion is about 1 mm, and the ground contact area ratio of the seat portion is set to 5 and 7%. did.

[0016]

[Table 1]

The impact sound level of the above soundproof floor material was measured according to JIS A-1418 by installing a cushioning rubber sheet so as to face the floor surface of the slab concrete. The load resistance indicates the amount of bending of the floor material when a load of 8 kg / cm ² is applied to the soundproof floor material. Table 2 shows these results. Further, FIG. 6 shows the relationship between the floor impact sound level and the octave band center frequency.

Example 2 The same decorative plywood, damping sheet, base plywood as in Example 1, and a nonwoven fabric made of polyester filaments having a thickness of 2 mm and a basis weight of 200 g, and the same ground contact area ratio of 7% as in Example 1
Using the buffer sheet of No. 3, a soundproof floor material was obtained by sequentially stacking these. The measurement results of the floor impact sound level and the load bearing capacity of the obtained soundproof floor material are shown in Table 2, and FIG. 6 shows the relationship between the floor impact sound level and the octave band center frequency.

Example 3 The same decorative plywood, damping sheet, base plywood as in Example 1 and a polyolefin foam having a thickness of 2 mm and an expansion ratio of 30 were laminated in this order, and the same ground contact area ratio as in Example 1 was obtained. A 5% buffer sheet was attached to obtain a soundproof flooring material. The results of measurement of the floor impact sound level of the obtained soundproofing floor material are shown in Table 2, and FIG. 6 shows the relationship between the floor impact sound level and the octave band center frequency.

Example 4 A soundproof flooring material was obtained by removing the vibration damping sheet (natural / SBR rubber foam) having a thickness of 1.5 mm from the soundproofing floor material of Example 1. Table 2 shows the measurement results of the floor impact sound level of the obtained soundproofing floor material.

Comparative Example 1 The same decorative plywood, damping sheet, base plywood as in Example 1 and a cushioning sheet having a trapezoidal cross-section with a thickness of 1 mm and a trapezoidal section (ground area ratio 60%) Was laminated to obtain a soundproof flooring material. The results of measuring the floor impact sound level of this floor material are shown in Table 2, and FIG. 6 shows the relationship between the floor impact sound level and the octave band center frequency.

COMPARATIVE EXAMPLE 2 The same decorative plywood, damping sheet, base plywood as in Example 1 and a nonwoven fabric made of polyester filaments having a thickness of 2 mm and a basis weight of 200 were used, and these were sequentially laminated to produce soundproofing. The floor impact sound level of this floor material was measured.
The results are shown in Table 2 and FIG. 6 shows the relationship between the floor impact sound level and the octave band center frequency.

Comparative Example 3 The same decorative plywood, vibration damping sheet, base plywood as in Example 1 and a polyolefin foam having a thickness of 4 mm and an expansion ratio of 30 were used, and these were sequentially laminated to produce a soundproof floor. The floor impact sound level of this floor material was measured. The results are shown in Table 2.

[0024]

[Table 2]

As described above, in this embodiment, the L value is 43 to 49 by setting the contact area ratio of the cushioning sheet having the seat portion to the lower ground to be 5 to 7%, which is excellent in soundproofing. ,
In particular, it can be seen that the floor impact sound level at low frequencies is reduced. However, when a cushioning sheet having a large ground contact area ratio without a seat is used, the floor impact sound level is high from a low frequency to a high frequency, the L value is increased, and the load resistance is also excellent.

[0026]

As described above, in the present invention, since the cushioning sheet locally contacts the base plywood and the base surface on the inner surface side and the outer surface side, and the air existing on the inner surface side and the outer surface side communicates with each other, First, the impact sound from the base plywood does not easily propagate to the base surface, and the impact sound is partially absorbed and attenuated, which has the effect of improving soundproofing, and further cushioning and load bearing. Is also excellent. In particular, only the protruding seat provided on the top of the raised portion contacts the base surface, and this state is maintained even when a load is applied, so it is difficult for the impact sound from the base plywood to propagate directly to the base surface. The soundproofing is further improved.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a soundproof flooring according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of the cushioning sheet used for the soundproof flooring of the present invention, as seen from the inner surface side.

FIG. 4 is a plan view of the cushioning sheet used for the soundproof flooring of the present invention as seen from the outer surface side.

5 is a cross-sectional view of a soundproof flooring material which is another embodiment of the present invention and corresponds to FIG.

FIG. 6 is a graph showing the relationship between the floor impact sound level of a soundproof flooring material and the octave band center frequency.

[Explanation of symbols]

 1 Soundproof Flooring Material 2 Plywood Layer 3 Decorative Plywood 4 Base Material Plywood 5 Slit 6 Buffer Sheet 7 Inner Side 8 Reference Surface 9 Recess 10 Adhesive 13 Air Passage 15 Outer Side 17 Raised 18 Lower Ground 19 Seat

[Procedure amendment]

[Submission date] June 4, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The impact sound level of the above soundproof floor material is measured by
The cushioning rubber sheet was placed so as to face the floor surface of the slab concrete, and the test was performed according to JIS A-1418. Also,
The load resistance indicates the amount of bending of the floor material when a load of 4 kg / cm ² is applied to the soundproof floor material. Table 2 shows these results.
Further, FIG. 6 shows the relationship between the floor impact sound level and the octave band center frequency.

Claims (5)

[Claims] 1. A cushioning sheet used for soundproof flooring,
One surface of the cushioning sheet has a recessed portion that is recessed from the reference surface and an adhesive portion that projects from the reference surface, and the other surface is provided with a seat portion on the top of the raised portion, and the raised portion is A buffer sheet, which is located at the same position as the recess, and has air passages formed on both surfaces for communicating the air contained therein. 2. A soundproof flooring comprising a plywood layer composed of a decorative plywood and a base plywood having a slit on one surface thereof, and a cushioning sheet attached to the surface having the slit, wherein the inner surface of the cushioning sheet is recessed from the reference surface. A recess having an elliptical shape and an adhesive portion protruding from the reference surface and in contact with the plywood layer, and a seat portion whose outer surface side is in contact with the base surface is provided on the top of the raised portion, and the raised portion is a recessed portion on the inner surface side. A soundproof flooring material, which is located at the same position as that of the above, and has air passages for communicating the air existing therein formed on the inner surface side and the outer surface side, respectively. 3. The soundproof flooring material according to claim 1, wherein the seat portion provided on the top of the raised portion is a protrusion. 4. The soundproof flooring material according to claim 2, wherein a damping sheet is interposed between the decorative plywood and the base plywood. 5. The soundproof flooring material according to claim 2, wherein a foam layer or a non-woven fabric is interposed between the base plywood and the cushioning sheet.