JP4217184B2 - Sound absorbing plate - Google Patents

Description

  The present invention relates to a sound absorbing plate used for forming a base such as a ceiling and a wall having high sound absorbing performance.

  Conventionally, sound-absorbing plates have been adopted as building materials for ceilings and walls in audio rooms equipped with AV equipment, music practice rooms, entertainment facilities, stores, living rooms, bedrooms, etc. to ensure the required level of sound-absorbing performance. By doing so, the sound absorption performance of the ceiling and walls is improved.

  Many of these conventional sound absorbing plates form a porous plate-like body having high sound absorbing performance by pressurizing a fiber material such as rock wool or glass wool, and form a concavo-convex pattern on the surface by the press. In addition, those having a surface finish by painting or the like are used (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 8-4144

  However, in these conventional sound-absorbing plates, since the surface finish has already been applied, the construction efficiency is excellent, but on the contrary, the design is limited within the range of the finished finish variation, so that the design is poor. There's a problem. Therefore, it is conceivable to finish the sound absorbing plate individually corresponding to various designs. However, the cost becomes high and the management of building materials becomes complicated and the construction period is delayed. In addition, it is conceivable to apply a decorative sheet material such as a wall cloth on the conventional sound absorbing plate, but since the decorative sheet is directly applied on the compressed fiber material, the adhesive strength is unstable. The decorative sheet is likely to peel off.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sound absorbing plate that is excellent in design and low in cost by eliminating the problems of the sound absorbing plate described above and allowing a decorative sheet to be attached thereon.

In order to achieve the above object, the invention according to claim 1 is characterized in that a decorative sheet material is pasted on at least one surface of a base plate formed by compressing a mixed fiber containing main fibers and low-melting melt fibers. The surface material is made of a polyethylene terephthalate spunbond nonwoven fabric and a surface layer using an ethylene vinyl acetate copolymer laminated on the surface .

  The invention according to claim 2 is the sound absorbing plate according to claim 1, wherein the mixed fiber has an average fiber diameter of 10 to 64 μm and an average fiber length of 10 to 100 mm.

The invention according to claim 3 is characterized in that the substrate has a bulk density of 0.5 × 10 ^{5 to} 3.0 × 10 ⁵ g / m ³ and a thickness of 5 to 20 mm. Or it is a sound absorption board of 2.

Since the present invention is constructed as described above, it can be finished by attaching a decorative sheet on the surface material, and is formed using various materials, and has abundant designs such as colors, patterns, and uneven patterns. By selecting and using the most suitable decorative sheet from among the decorative sheets provided, you can obtain various designs that are suitable for the use in stores, living rooms, entertainment rooms, etc., and the use site such as the ceiling and walls. Excellent decoration. And the said surface material consists of a spunbond nonwoven fabric of PET, and the surface layer using EVA laminated | stacked on the surface. Since the surface rigidity is increased by the spunbond nonwoven fabric, the smoothness of the surface of the decorative sheet material applied thereon is increased. In addition, a surface to be coated having a denseness and smoothness is formed by the surface layer, and the decorative sheet material can be reliably attached. A substrate formed by compressing mixed fibers into a plate has excellent sound absorbing performance because it has innumerable voids formed by inter-fiber gaps inside.

  Further, as in the invention described in claim 2, when the mixed fiber has an average fiber diameter of 10 to 64 μm and an average fiber length of 10 to 100 mm, it is excellent in workability and easily made into a plate-like substrate. And sufficient sound absorption performance.

Also as in the invention of claim 3, wherein said substrate has a bulk density of ^{0.5 × 10 5 ~3.0 × 10 5} g / m 3, when the thickness is 5 to 20 mm, required as building materials Excellent rigidity and workability, and excellent sound absorption performance.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of the sound absorbing plate 1. The sound absorbing plate 1 of the present invention is constituted by bonding a base 2 and a surface material 3 for attaching a decorative sheet material.

  The base body 2 is formed by compressing mixed fibers containing main fibers and low-melting melt fibers into a plate shape. As the main fiber, synthetic fibers such as polyester, polyolefin, polyamide, acrylic, and carbon are used for general purposes. Moreover, the fiber which compounded 2 or more types among these polymer components can also be used. Among these, the use of PET, polybutylene terephthalate or the like is preferable from the viewpoint of fiber moldability and the like.

  The low-melting melt fiber has a melting point that is 40 ° C. lower than that of the main fiber, and synthetic fibers such as polyurethane, polyester, and polyolefin are used. And this low melting-point molten fiber is used in the range of 0.1-1 times by weight ratio with respect to the said main fiber, and comprises the said mixed fiber.

  In the present embodiment, the mixed fiber having an average fiber diameter of 10 to 64 μm and an average fiber length of 10 to 100 mm is used. When the average fiber diameter is less than 10 μm, the average fiber diameter becomes too thin, the rigidity of the compressed base 2 is insufficient, and the inside of the base 2 is excessively densified, so that the voids are reduced and the sound absorption performance is lowered. If the average fiber diameter exceeds 64 μm, the average fiber diameter becomes too large, and the ratio of the fibers entangled with each other decreases. As a result, the rigidity of the base body 2 becomes insufficient, and the voids inside the base body 2 become excessive and the sound absorption performance decreases. . Further, if the average fiber length is less than 10 mm, the entanglement between the fibers due to compression becomes shallow, so that the rigidity of the compressed substrate 2 is insufficient and the workability is poor, and further, the economic efficiency is lowered. Further, the workability is deteriorated, and the sound absorbing performance is deteriorated because the fiber sound absorbing plate is inferior in uniformity.

The substrate 2 is not particularly limited and is formed by a known method. For example, using a known hot press apparatus, the mixed fiber is subjected to a pressure of about 1.0 × 10 ^{6 to} 1.0 × 10 ⁷ N / m ² , a temperature of about 130 to 160 ° C. for about 1 to 200 seconds, Heat and pressurize. In this way, the mixed fiber is compressed and a plate-like substrate 2 is formed by heat fusion of the low melting point molten fiber.

The substrate 2 is formed in a plate shape having a bulk density of 0.5 × 10 ^{5 to} 3.0 × 10 ⁵ g / m ³ and a thickness of 5 to 20 mm. When the bulk density is less than 0.5 × 10 ⁵ g / m ³ , the inside of the substrate 2 becomes too sparse, the rigidity of the substrate 2 is insufficient, and the sound absorption performance is lowered, conversely, 3.0 × 10 ^5. If it exceeds g / m ³ , the inside of the substrate 2 becomes too dense, the sound absorbing performance is lowered, and the weight becomes too heavy. If the thickness is less than 5 mm, the sound absorbing performance is deteriorated, and the bending rigidity of the base 2 is insufficient, and warping and cracking are likely to occur. If the thickness exceeds 20 mm, the thickness becomes excessive and the weight becomes too heavy, so that the handling property is increased. And material cost increases more than necessary.

  The surface material 3 includes a spunbond nonwoven fabric 4 formed by a spunbond method using PET and a surface layer 5. The spunbonded nonwoven fabric 4 can enhance the surface rigidity for attaching the decorative sheet material and ensure the smoothness of the surface of the decorative sheet material. Moreover, since the surface layer 5 forms an adherend surface having a denseness and smoothness on the surface, the decorative sheet material can be reliably attached, and no adhesion failure or partial peeling occurs.

The spunbonded nonwoven fabric 4, basis weight is formed to about 10 to 100 g / m ^2. If it is less than 10 g / m ² , the surface rigidity for supporting the decorative sheet material to be attached is insufficient, and the decorative sheet material is swelled. If it exceeds 100 g / m ² , the surface rigidity for supporting the decorative sheet material is insufficient. It becomes excessive, the weight and thickness become excessive, and the material cost increases.

  The surface layer 5 is made of a resin layer using EVA and is formed on the surface of the spunbond nonwoven fabric 4. The surface layer 5 is formed to a thickness of about 5 to 50 μm. If the thickness is less than 5 μm, the strength to maintain the adhesiveness with the decorative sheet material to be adhered thereon is insufficient, and adhesion failure tends to occur. If the thickness exceeds 50 μm, a barrier layer is formed between the indoor space and the substrate 2, and sound absorption Reduce performance.

  The base body 2 and the surface material 3 are arranged integrally with an adhesive such as EVA, polypropylene resin, polyethylene resin, modified PET (low melting point), other films, webs, powders, etc., with the surface layer 5 arranged outside. It is glued. Further, in this example, the surface material 3 is provided only on one surface of the base body 2, but the surface material 3 can also be formed on both surfaces of the base body 2, and in this case, the surface material is attached to a mounting base such as a base rail. Since 3 contacts, it is preferable at the point which an attachment state becomes stable.

A substrate having a bulk density of 1.6 g × 10 ⁵ g / m ³ and a thickness of 8.7 mm by using PET fibers having an average fiber diameter of 28 μm and an average fiber length of 51 mm and pressing them with a known press device 2 was formed. A surface layer 3 using an EVA film having a thickness of 30 μm was attached to the surface of a spunbonded nonwoven fabric using PET having a basis weight of 45 g / m ² to form a surface material 3. The base body 2 and the surface material 3 were integrally laminated and bonded together using an EVA adhesive, and an example having a total thickness of 9 mm was made as a prototype. This example was cut into a rectangular plate shape having a length of 1800 mm and a width of 900 mm for ease of handling.

  FIG. 2 shows the result of measuring the reverberation time in order to evaluate the sound absorbing performance of the sound absorbing plate A. The measurement conditions were a space of 8 tatami mats, the above example was used as the ceiling foundation, and a decorative sheet material mainly composed of cloth was affixed thereon. In addition, the floor surface was made into a flooring finish, and the wall surface was configured by attaching a decorative sheet material mainly composed of a cloth on a 12.5 mm thick gypsum board base.

  From the measurement results, when the sound absorbing plate of the example is used, the room reverberation time can be set to 0.5 to 0.6 seconds which is the optimum reverberation time, and conversation, TV sound, etc. are easy to hear and have the optimum sound. It became clear that I could listen to audio.

  Furthermore, for comparison, Comparative Example 1 in which all other conditions were the same, and a 12.5 mm gypsum board was used as the ceiling foundation, and a 9.0 mm thick rock wool sound absorbing board (manufactured by Matsushita Electric Works, “Humidity carving heaven The reverberation time of Comparative Example 2 using “)” was measured. The reverberation time of the example was much shorter than that of Comparative Example 1, and it was found that the sound absorption effect was high. Compared with Comparative Example 2 using a rock wool sound absorbing plate, the reverberation time characteristics are substantially the same. However, in the 2 to 4 KHz region, the reverberation time of Comparative Example 2 exceeds 0.6 seconds and the optimal reverberation time. However, the example shows the characteristic of the optimal reverberation time.

  FIG. 3 shows the result of measuring the sound pressure level in accordance with JIS-C-1502 in order to measure the indoor quiet performance with respect to the indoor sound source. The measurement conditions were as follows. A space of 10 tatami mat equipped with an air conditioner was used as a sound source, the sound absorbing plate of the example was used as the ceiling base, and a decorative sheet material mainly composed of cloth was attached thereon. The floor and wall specifications were the same as the conditions for the sound absorption performance evaluation test. For comparison, all other conditions were the same, and the same measurement was performed for Comparative Example 3 using a 12.5 mm gypsum board as the ceiling foundation. From the measurement results, it was found that when the sound absorbing plate of the example was used, the air conditioner use sound 500 to 4 KHz band sound could be reduced by 3 to 6 dB compared with the comparative example 3, and the noise level could be improved by 5 dB (A). .

  FIG. 4 shows the result of measuring the sound pressure level in accordance with JIS-A-1417 in order to measure the indoor quiet performance of the outdoor sound source. The measurement condition is that a space of 1 tatami mat adjacent to the toilet as a sound source is used, the sound absorbing plate of the embodiment is used as the base of the ceiling and wall, and a decorative sheet material mainly composed of cloth is pasted thereon. I attached. The floor specifications were the same as the conditions of the sound absorption performance evaluation test. The same measurement was performed in the same manner for Comparative Example 4 in which all other conditions were the same for comparison and 12.5 mm gypsum board was used as the base of the ceiling and wall. From the measurement results, it was found that when the sound absorbing plate of the example was used, the propagation of the toilet use sound to the adjacent living room can be reduced by 4 to 8 dB in the 500 to 4 KHz band sound, and the noise level can be improved by 5 dB (A). did.

It is a perspective view which illustrates one embodiment of the present invention. It is a graph which shows the measurement result of the sound absorption performance of Example A of this invention. It is a graph which shows the measurement result of the indoor quiet performance with respect to the indoor sound source of Example A of this invention. It is a graph which shows the measurement result of the indoor quiet performance with respect to the outdoor sound source of Example A of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sound absorption board 2 Base | substrate 3 Surface material 4 Spunbond nonwoven fabric 5 Surface layer

Claims (3)

A surface material for adhering a decorative sheet material is bonded to at least one surface of a substrate formed by compressing mixed fibers including main fibers and low-melting melt fibers, and the surface material is made of polyethylene terephthalate. Spunbond nonwoven fabric,
A sound absorbing plate comprising a surface layer using an ethylene vinyl acetate copolymer laminated on the surface thereof.   The sound absorbing plate according to claim 1, wherein the mixed fibers have an average fiber diameter of 10 to 64 µm and an average fiber length of 10 to 100 mm. The sound absorbing plate according to claim 1 or 2, wherein the substrate has a bulk density of 0.5 x 10 ^{5 to} 3.0 x 10 ⁵ g / m ³ and a thickness of 5 to 20 mm.

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