JP3643610B2 - Sound absorbing material - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a sound-absorbing material that prevents noise leakage, and more particularly, to a sound-absorbing material that is disposed along the inner peripheral surface of a container that houses an air cleaner and prevents unpleasant sound leakage such as wind noise.
[0002]
[Prior art]
When unpleasant sounds such as noise are generated in various devices, sound leakage is generally prevented by disposing a sound absorbing material or adopting a silencing structure. For example, in an air cleaner, a sound absorbing material may be disposed in an air cleaner box (container) to prevent sound leakage such as wind noise generated when air passes.
[0003]
FIG. 4 is a perspective view with a partially broken portion showing an example of a conventional sound absorbing material mounted in an air cleaner box. As shown in the figure, the sound absorbing material 10 includes a sound absorbing portion 12 disposed corresponding to each inner surface of the air cleaner box, and an edge portion 13 disposed around each sound absorbing portion 12, and both side surfaces thereof. Is covered with covers 14a and 14b. A felt (sound absorbing member) 15 formed in a shape corresponding to the shape of the corresponding inner surface of the air cleaner box to be mounted is inserted into the sound absorbing portion 12 having a relatively large thickness.
On the other hand, the edge 13 is a part formed by directly bonding the covers 14a and 14b on both sides, and can be bent. Therefore, the sound absorbing material 10 can be disposed in the air cleaner box in a state where each sound absorbing portion 12 corresponds to a predetermined inner surface by bending at the edge portion 13.
[0004]
[Problems to be solved by the invention]
However, although the felt 15 used as the sound absorbing member in the conventional sound absorbing material 10 has excellent sound absorbing properties, the surface thereof is uneven, causing hair loss and causing dust. I can not.
Therefore, when a felt is used as a sound absorbing member for a sound absorbing material to be attached to an apparatus having an important cleanliness such as an air cleaner, it is necessary to cover the felt 15 with non-blurred materials 14a and 14b like the sound absorbing material 10. is there.
[0005]
Further, since the conventional sound absorbing material 10 is formed by covering the sound absorbing member 15 cut into a predetermined shape with the covers 14a and 14b from both sides, if the position of the felt 15 with respect to the covers 14a and 14b is shifted, the sound absorbing material 15 is formed. When the material 10 is mounted in the box, the position of the sound absorbing portion 12 is deviated from the corresponding surface, so that the mounting property is inferior and sufficient sound absorbing performance cannot be exhibited.
[0006]
Furthermore, depending on the shape of the sound absorbing member 15, the felt cutting operation may be complicated, and it is necessary to assemble the sound absorbing member 15 while being placed at an accurate position.
[0007]
An object of the present invention, which has been made in view of the above problems, is to provide a sound-absorbing material that has a simple structure and is manufactured with a small number of steps.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a sound absorbing portion disposed along each inner surface of a container in which an air cleaner is accommodated, and disposed around each sound absorbing portion and interconnecting these sound absorbing portions. A sound-absorbing material comprising a bendable edge portion, and the sound-absorbing material is composed only of a fluff-like material laminated web made of fibers mixed with heat-sealing fibers, and on the outer periphery of the sound-absorbing portion. The sound-absorbing material is characterized in that a surface defined in a predetermined shape is formed by fusing fibers together with the heat-fusible fiber.
[0009]
[Action]
The sound absorbing material has a foldable edge, and when the edge is bent and each sound absorbing portion is disposed along each inner surface of the corresponding container, the sound absorbing material is mounted in the container. In addition, heat-sealable fibers are blended in the material of the sound-absorbing material. When the surface fibers are fused to each other by the heat-sealable fibers, the surfaces are defined in a predetermined shape and the occurrence of hair loss is prevented. The
[0010]
【Example】
Next, examples of the sound absorbing material according to the present invention will be described in detail. In addition, the same code | symbol is attached | subjected to the site | part common to the site | part of the conventional sound-absorbing material already demonstrated.
FIG. 1 is a perspective view showing a sound absorbing material of this embodiment, and FIG. 2 is a cross-sectional view taken along line AA ′ in FIG.
[0011]
As shown in FIG. 1, the sound absorbing material 1 includes a relatively thick sound absorbing portion 2 and a relatively thin edge 3 disposed around the sound absorbing portion 2. Of these, the sound absorbing portion 2 is a portion disposed on the corresponding inner surface of an air cleaner box (container, not shown) in which the sound absorbing material 1 is mounted. Sound generated in the air cleaner box such as wind noise is mainly generated. It is absorbed in the sound absorbing part 2. The sound-absorbing material 1 of this embodiment is formed by hot pressing, and its surface 4 is partially welded to prevent flaking and hair loss, but the fibers inside the sound-absorbing part 2 described above. Is in the form of so-called absorbent cotton, which is generally referred to as a Kata cotton laminated web, and can effectively absorb sound leakage such as wind noise.
[0012]
On the other hand, the edge portion 3 formed around the sound absorbing portion 2 is thinner than the sound absorbing portion 2 and can be bent at a fold. For example, the sound absorbing material of the present embodiment is mounted in the air cleaner box in a state where the edge portion is folded and folded in a state indicated by a two-dot chain line in FIG.
Note that the shape of the sound absorbing material, such as the shape and number of the sound absorbing portions, corresponds to the shape of a container such as an air cleaner box to be mounted, and needless to say, it should be formed corresponding to the shape of the container.
[0013]
Examples of the fibers used for the material of the sound absorbing material 1 include nylon and polypropylene. Polyester is most preferable. In addition, if the basis weight is the same, the single yarn fineness is preferably as thin as possible from the point of the silencing effect, while it is preferable to be thick from the viewpoint of maintaining the shape. As a result of various examinations of such advantages and disadvantages, in order to achieve the object of the present invention, the single yarn fineness of the polyester fiber may be 1 to 12 denier, preferably 1.5 to 6 denier. Is the best. And the material of a sound-absorbing material is shape | molded by the Kata cotton (laminated web) which mix | blended normal polyester fiber and what is called heat-fusible polyester fiber in a predetermined ratio.
[0014]
The heat-fusible fiber is a fiber composed of a core material made of polyester having a relatively high melting point and a sheath material made of polyester having a relatively low melting point that covers the periphery of the core material, and is lower than the melting point of the core material. When heated to a temperature higher than the melting point of the sheath material, only the sheath material is melted.
[0015]
Accordingly, when the sheath material of the heat-sealable fiber is melted by heating the material, the melted fiber functions as a binder, and bonds the heat-sealable fiber and normal polyester fiber or normal polyester fibers. As described above, if the material of the heat-absorbing material 1 is blended with heat-fusible fibers, the surface 4 is fused by applying heat, so the outer shape of the material, that is, the surface of the sound-absorbing material 1 is obtained by hot pressing. At the same time as defining the shape, it is possible to suppress fluffing and hair loss on the sound-absorbing material surface 4 causing dust.
[0016]
Although various combinations of melting temperatures of the core material and the sheath material of the heat-fusible fiber can be set, the heat-fusible fiber of this example has a core material having a melting point of about 260 ° C. and a sheath having a melting point of about 120 ° C. It consists of materials. The blending ratio of the heat-fusible fiber is required to be 10% or more based on the total weight in order to exhibit the above-mentioned characteristics, that is, the characteristics of suppressing galling and hair loss, but if it is too much, it becomes too hard after fusing. This reduces the soundproofing effect. For this reason, the blending ratio of the heat-sealing fibers in the Kata cotton (laminated web) is 10 to 60% (weight), preferably 15 to 40% (weight).
[0017]
The thickness of the flat plate-like material depends on the size of the sound absorbing material to be manufactured, but when manufacturing a sound absorbing material to be attached to a normal air cleaner box, a thickness of about 20 to 30 mm is used. On the other hand, if the bulk density per unit area of the material is too small, the soundproofing effect decreases, and if it is too large, it is economically disadvantageous and at the same time the soundproofing efficiency decreases. .2 to 1.5 kg / m ² , preferably 500 g to 1 kg / m ² .
[0018]
A method for forming a sound absorbing material by hot pressing such a material will be described.
First, a flat plate material cut into a predetermined shape is carried into a hot press die (not shown) that has been heated to a predetermined temperature in advance, and is subjected to hot pressing. The mold is formed with uneven shapes corresponding to the sound absorbing portion 2 and the edge portion 3, and a predetermined number (five in the present embodiment) of the sound absorbing portion 2 and the edge portion 3 are formed at a time by hot pressing. Molded. When molded by pressing in this way, all the sound absorbing portions 2 can be molded at a time, so that the mutual positions do not shift and the sound absorbing material 1 having the same shape without variation can be molded. Moreover, since it can shape | mold in one process, the sound-absorbing material 1 can be manufactured at a very low manufacturing cost.
[0019]
In this embodiment, the material is pressed into a sound absorbing material 1 having a desired shape by pressing the material for 40 seconds with a mold heated to 150 ° C. In this case, since the surface 4 of the material (sound absorbing material 1) in contact with the mold is heated first, the heat-sealing fiber on the surface 4 is first melted. The melted heat-sealing fiber functions as a binder for bonding the heat-sealing fiber and normal fibers or normal fibers, and when these materials are cooled, these fibers are connected to each other.
[0020]
In this way, when a material mixed with heat-bonding fibers is used, the material is molded into a predetermined shape by hot pressing, and at the same time, the fibers on the surface 4 of the material (sound absorbing material 1) are bonded to each other so as to remove hair and hair loss. Can be suppressed. Therefore, in the sound absorbing material 1 of the present embodiment, a member such as a cover for preventing dust is unnecessary.
[0021]
On the other hand, since the inside of the material (sound absorbing material 1) is not heated as rapidly as the surface, for example, if the heat pressing time is relatively short as in this embodiment, the heat-sealing fiber inside the sound absorbing part 2 is almost melted. Not. That is, the inside of the sound absorbing portion 2 hardly changes before and after the heat press and remains in a so-called absorbent cotton shape, so that excellent sound absorbing performance is maintained.
[0022]
In addition, the sound-absorbing material 1 of the said Example is one Example for demonstrating this invention clearly, and does not limit the content of this invention. Accordingly, various modifications can be made. For example, as shown in FIG. 3, the shape of the sound-absorbing material 1 may naturally be composed of one sound-absorbing portion 2 and an edge portion 3 formed around the sound-absorbing portion 2. In this embodiment, the mold is heated to 150 ° C. and hot pressing is performed, but the heating temperature of the mold may be any temperature that can melt the sheath material of the heat-fusible fiber. Furthermore, the heat pressing time should be set according to the melted state of the heat-sealing fiber inside the sound absorbing portion, and needless to say, it may not be 40 seconds.
[0023]
【The invention's effect】
As described above, according to the present invention, since the material of the heat-absorbing material is blended with the heat-sealable fiber, the surface is defined in a predetermined shape by the heat-sealable fiber that is melted by the hot press. It is possible to suppress surface flaking and hair loss that cause dust. Therefore, it is not necessary to arrange a cover for preventing dust and hair loss on the surface of the sound absorbing material. Thus, the sound-absorbing material according to the present invention is a sound-absorbing material having a very simple structure made of only a material blended with heat-fusible fibers, and can be manufactured with very few processes.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a sound absorbing material according to the present invention.
FIG. 2 is a cross-sectional view showing the AA cross section of FIG. 1;
FIG. 3 is a perspective view showing another embodiment of a sound absorbing material according to the present invention.
FIG. 4 is a perspective view showing a conventional sound-absorbing material and having a stepped portion in a part thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sound absorption material, 2 ... Sound absorption part, 3 ... Edge part, 4 ... Surface.

Claims (1)

A sound absorbing material comprising a sound absorbing portion disposed along each inner surface of a container in which an air cleaner is accommodated, and a bendable edge disposed around each sound absorbing portion and interconnecting these sound absorbing portions. Because
The sound-absorbing material is composed of only a cotton-like material laminated web made of fibers mixed with heat-sealing fibers, and the fibers are fused to each other by the heat-sealing fibers on the outer periphery of the sound-absorbing portion. A sound absorbing material characterized in that a surface defined in a predetermined shape is formed.

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