JPH1088689A - Sound absorption structural body partially sticking sound absorbing film thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorption structural body showing excellent sound absorption efficiency without using any thick fibered sound absorbing material by sticking a sound absorbing film on a perforated board partially in a state of non-tensile force. SOLUTION: In this sound absorption structural body, a sound absorbing film 2 is laminated on one side or both sides of a metal plate (punching metal 1) having a large number of openings, and the sound absorbing film 2 is made to partially adhere to the metal plate 1 in a state of non-tensile force. The metal plate 1 sticking the sound absorbing film 2 thereon is combined with a frame structural body 4 such as channel steel, and sound absorbing frequency is controlled by providing a rear side air layer 5 between the metal plate 1 and frame structural body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing structure in which a sound absorbing film which does not require a fibrous sound absorbing material is partially adhered.

[0002]

2. Description of the Related Art Soundproof walls of houses, buildings, and the like are constructed using fibrous materials such as rock wool and glass wool as sound absorbing materials. When absorbing noise with fibrous materials, 2
Noise in the high frequency range above kHz can be absorbed even by a relatively thin fiber layer. However, for noise in the low frequency region of 2 kHz or less, the required sound absorbing effect cannot be obtained unless the fiber layer is thickened. Therefore, use of a film as a thin material having a sound absorbing property is being studied. In this case, since the film absorbs sound due to resonance vibration of the film, the film is rarely used alone, and is used in a form covering the surface of a sound absorbing fiber layer such as rock wool or glass wool while also finishing the fibrous material. ing.

[0003]

The method of attaching a sound absorbing film to the surface of a fiber layer requires a lot of time and labor. Also, depending on the application to the fiber layer, the sound absorbing film may not exhibit the initial performance. Furthermore, there is a limit in making the fiber layer thinner, and as a result, the soundproof wall tends to be thicker. The present invention has been devised to solve such a problem.By partially applying the sound absorbing film to a perforated plate in a non-tension state, without using a thick fibrous sound absorbing material, An object of the present invention is to provide a sound absorbing structure exhibiting excellent sound absorbing performance.

[0004]

The sound-absorbing structure of the present invention comprises:
In order to achieve the object, a sound absorbing film is laminated on one or both sides of a metal plate having a large number of openings, and the sound absorbing film is partially adhered to the metal plate in a tensionless state. And As the metal plate, a punching metal, a mesh, an expanded metal, a chute slit metal, or the like is used. The material of the sound absorbing film is not particularly limited.
Resin films such as polypropylene, polyester, cellophane, nylon, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyurethane, fluororesin, and polyacrylonitrile. If the sound absorbing film is too thin, it becomes difficult to handle, and if it is too thick, the sound absorbing property is reduced, so that the sound absorbing film preferably has a thickness of 20 to 300 μm. When a metal plate to which a sound absorbing film is attached is combined with a frame structure such as channel steel and a back air layer is provided between the metal plate and the frame structure, the sound absorption frequency is controlled.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to attach a sound absorbing film to a metal plate having a large number of openings without tension, a method of partially bonding the metal plate and the sound absorbing film is employed. In the following description, a punching metal will be described as an example of the metal plate. Many holes are formed in the punching metal 1 as shown in FIG. This punching metal 1
Then, the sound absorbing film 2 is partially adhered with the adhesive 3. In FIG. 1, the sound absorbing film 2 is laminated on one side of the punching metal 1, but the sound absorbing film 2 may be laminated on both sides of the punching metal 1 as shown in FIG. The adhesive 3 is partially applied to the sound absorbing film 2 as shown in FIG.

The sound absorbing film 2 to which the adhesive 3 is partially applied is attached to the punching metal 1 in a tensionless state. Since the sound absorbing film exhibits a sound absorbing effect by the film itself resonating with the energy of sound,
The film is attached to the punching metal 1 in a tensionless state so as to vibrate. When the punching metal 1 on which the sound absorbing film 2 is laminated is combined with a frame structure 4 such as a channel steel as shown in FIG. 4, a back air layer 5 is formed between the punching metal 1 and the frame structure 4. . The sound absorption frequency is controlled according to the size of the back air layer 5. Therefore, even in the case where the sound absorbing material is thin, noise in a low frequency region of 2 kHz or less is efficiently absorbed.

[0007]

EXAMPLE As a punching metal 1, a stainless steel plate having a thickness of 0.6 mm in which holes having a diameter of 8 mm were formed at a pitch of 10 mm was prepared. A 50 μm-thick polyethylene film was laminated as a sound absorbing film 2 on a punching metal 1 using a latex adhesive 3. At this time, the bonding area was set to about 20%, and the sound absorbing film 2 was partially bonded to the punching metal 1. In order to investigate the sound absorbing performance of the laminated sound absorbing material, the normal incidence sound absorbing coefficient was measured using a 4206 type 2 microphone measuring tube and a 2032 type FFT analyzer manufactured by B & K. FIG. 5 shows the measurement results. In FIG. 5, the same punching metal 1 is referred to as Comparative Example 1, and the same punching metal 1 is attached to the entire surface of the same punching metal 1 and bonded with the same sound absorbing film 2 as Comparative Example 2.

As apparent from FIG. 5, a large sound absorbing performance cannot be expected with a single punched metal (Comparative Example 1).
However, a high sound absorption coefficient is obtained by partially laminating the sound absorbing film in a tensionless state. However, when the sound absorbing film was attached to the entire surface of the punching metal by applying tension (Comparative Example 2), the sound absorbing coefficient was significantly reduced. In addition, the vertical incidence sound absorption coefficient was similarly measured for the case where the thickness of the back air layer 5 was changed by using the frame structure 4 having a different shape. When the measurement results were arranged by the thickness of the back air layer 5, the peak sound absorption frequency could be controlled by the thickness of the back air layer 5, as shown in FIG.

[0009]

As described above, the sound-absorbing structure of the present invention is obtained by partially adhering a sound-absorbing film to a metal plate having a large number of openings, such as punching metal, in a non-tension state. A sound-absorbing structure exhibiting excellent sound-absorbing performance can be obtained without requiring a fibrous sound-absorbing material such as wool or glass wool. Further, when an air layer is formed on the back of the sound absorbing structure in combination with the frame structure, the sound absorbing frequency can be controlled by the thickness of the back air layer. Thus, according to the present invention, a sound absorbing structure corresponding to the noise to be cut off is provided.

[Brief description of the drawings]

FIG. 1 A sound absorbing structure in which a sound absorbing film is laminated on one side of a punched metal

Fig. 2 Sound absorbing structure with sound absorbing film laminated on both sides of punched metal

[Figure 3] To partially adhere to the punching metal,
Sound absorbing film partially coated with adhesive

FIG. 4 shows a sound absorbing structure in which a back air layer is formed in combination with a frame structure.

FIG. 5: Effect of sound absorbing property of punching metal and tension of sound absorbing film on sound absorbing performance

FIG. 6: Effect of rear air layer on sound absorption performance

[Explanation of symbols]

1: punching metal 2: sound absorbing film 3:
Adhesive 4: Frame structure 5: Back air layer

Continued on the front page (72) Inventor Kenji Koshiishi 7-1 Takayashinmachi, Ichikawa-shi, Chiba Nisshin Steel R & D Co., Ltd.

Claims (2)

[Claims] 1. A sound absorbing film laminated on one or both sides of a metal plate having a large number of openings, and a sound absorbing film partially adhered to the metal plate in a tensionless state is used. Sound absorbing structure. 2. The sound absorbing structure according to claim 1, wherein the metal plate is combined with a frame structure, and a back air layer is provided between the metal plate and the frame structure.