JPH11293804A - Fiber laminated sound absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the penetration of moisture by forming a sound absorbing material consisting of a core material layer consisting of an organic fiber nonwoven fabric and a surface layer consisting of a water repellent-finished organic fiber nonwoven fabric laminated on one side or both sides of the core material layer through an adhesive layer. SOLUTION: A surface layer 2 consisting of an organic fiber nonwoven fabric is laminated on one side of a core material layer 1 consisting of an organic fiber nonwoven fabric through an adhesive layer 3 to form a fiber laminated sound absorbing material. The core material layer 1 consists of a sheet formed by mixing 35% of a polyester low melting point fiber with a fiber diameter of 3 deniers to 65% of a polyester fiber with a fiber diameter of 6 deniers, and the surface layer 2 consists of a polyester nonwoven fabric subjected to water repellent finishing. The apparent density of the core material layer 1 is set to 0.01 g/cm<3> or more, the apparent density of the surface layer 2 is set to 0.05 g/cm<3> or more, and the space between fibers is set to 200 μm or less. Accordingly, the surface layer prevents the penetration of water drops to the core material layer, and noise can be sufficiently inputted from the surface layer to the core material layer to improve the sound absorbing performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber laminated sound-absorbing material used in buildings, civil engineering materials, railroads, roads, airports, various stadiums, amusement facilities and the like, in particular where noise control is required.

[0002]

2. Description of the Related Art Conventionally, a fiber-based sound-absorbing material having a sound-absorbing performance has been attached to a soundproof wall such as a railway or a road. In this case, there is a problem that water enters the gaps of the fiber-based sound absorbing material due to rainfall and the like, and the sound absorption coefficient is reduced. Measures have been taken such as applying

[0003]

In the conventional countermeasures against water intrusion, the sound absorption coefficient has been reduced and the cost has been high.

Accordingly, an object of the present invention is to provide a fiber-laminated sound absorbing material which can be manufactured at a low cost without preventing infiltration of moisture, without deteriorating the performance of the sound absorbing material such as sound absorbing performance. And

[0005]

In order to achieve the above object,
Therefore, the present invention provides an apparent density of 0.01 g / cm.³More than
Appearance on one or both sides of core layer made of organic fiber non-woven fabric
Density 0.05g / cm ³The gap between fibers is 200μ
m or less and a table made of water-repellent organic fiber nonwoven fabric
It is a laminate of skin layers.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, a skin layer 2 made of an organic fiber nonwoven fabric is laminated on one surface of a core material layer 1 made of an organic fiber nonwoven fabric. The core material layer 1 mixes 35% of a polyester low melting point fiber having a fiber diameter of 3 denier and 65% of a polyester fiber having a fiber diameter of 6 denier, and after forming these fibers, forms a sheet (this is referred to as a web). The web is obtained by heating the web at 150 ° C. for 1 minute to melt the polyester low melting point fibers and bonding the web fibers together. As the skin layer 2, a polyester nonwoven fabric having a fiber diameter of 3 denier manufactured by a spun bond method was used. The nonwoven fabric has been subjected to a water-repellent treatment. The spun bond method is a processing method of forming webs by a dry method and thereafter bonding the fibers of the webs to each other, and is also called a spinning type. As a processing method after forming the web, there are an adhesive type and a mechanical bonding type (fiber rocker type) in addition to the spun bonding method. The formation of the core material layer 1 and the skin layer 2 is performed by a processing other than the above-described spun bonding method. It is also possible by a method.
Also, rayon,
A wide range of raw fibers such as acetate, nylon, polypropylene, tetron, and vinylon can be used.

An adhesive layer 3 is provided between the core layer 1 and the skin layer 2. For the adhesive layer 3, a web containing polyester fibers having a melting point of 200 ° C. or more, preferably 250 ° C., and containing 60 to 100% by weight of polyester low melting point fibers can be suitably used. A core material layer 1 having an adhesive layer 3 provided between the core material layer 1 and the skin layer 2 was heated at 180 ° C. for 1.5 hours using a compression press.
After heating for 1 minute, the low-melting fiber was melted and integrated to obtain a fiber laminated sound absorbing material. At this time, the apparent density of the core material layer 1 is 0.1.
01 g / cm ³ or more, apparent density of skin layer 2 is 0.05
g / cm ³ or more, and the gap between the fibers is 200 μm or less. When the gap between the fibers of the skin layer 2 exceeds 200 μm, water droplets easily enter. Even if it is 200 μm or less, it does not hinder noise input. Preferably 0.1
μm to 100 μm.

The low melting point fiber used for the adhesive layer 3 is 80
It melts at 180 to 180 ° C, particularly 90 to 170 ° C. For example, polyester fibers having a melting point of 110 ° C or 130 ° C can be suitably used. Instead of normal adhesive,
An adhesive layer 3 containing 60 to 100% by weight of the low-melting fiber is provided between the skin layer 2 and the core layer 1, and the skin layer 2 can be adhered to the core layer 1 by heating and pressurizing. Thus, a molded article consisting of only fibers can be formed, and in this respect, the working environment, recyclability, and cost are excellent.

The organic fiber nonwoven fabric forming the core layer 1 and the skin layer 2 has a fiber having a melting point of 200 ° C. or higher, that is, the fiber diameter of the substrate is 15 denier or less, preferably 0.5 to 6 denier, more preferably 1 to 6 denier. Forming from 4 denier fibers is preferred in terms of performance and cost.

The apparent density of the core layer 1 is as described above.
Sea urchin 0.01g / cm³Above, but more preferably
0.02-0.5 g / cm³, More preferably 0.0
3 to 0.4 g / cm³It is. The apparent density of the skin layer 2 is
0.05g / cm³Above, more preferably 0.2-1.
2g / cm³And more preferably 0.3 to 1 g / cm. ³
And By making the skin layer 2 denser than the core layer 1
Thus, a highly rigid fiber laminated sound absorbing material can be obtained.

The thicknesses of the core layer 1 and the skin layer 2 are appropriately selected according to the purpose of use. For example, when the core layer 1 and the skin layer 2 are used as a sound absorbing material to be attached to a soundproof wall, the thickness of the core layer 1 should be 3 to 10 mm.
0 mm, preferably 4 to 60 mm, and the thickness of the skin layer 2 is 1/100 to 1/3, preferably 1/60 of the thickness of the core layer 1.
It is preferable to set it to １ ／ in view of sound absorbing performance and cost.

In the embodiment shown in FIG. 2, a skin layer 2 is laminated on both sides of a core layer 1. As the skin layer 2, a nonwoven fabric made of polyester fiber having a fiber diameter of 1 denier by a spunlace method was used. This nonwoven fabric has been subjected to a water-repellent treatment. The skin layers 2 laminated on both sides of the core layer 1 may have different material fibers or different apparent densities on one side and the other side. Also in this embodiment, the same adhesive layer 3 as described above was provided between the core material layer 1 and the skin layer 2, and the laminate was formed for 15 minutes for 1 to 2 minutes.
Heat at 0-190 ° C and pressurize at 0.1-5 kg / cm ² .

[0014]Example 1  Core layer 1 ... polyester with a fiber diameter of 3 denier Low melting point
(100 ° C) Polyester with 35% fiber and 6 denier fiber diameter
Combined with tellurium fiber (melting point 250 ° C) to form web
And heat-treated at 180 ° C. for 1 minute. Apparent density
0.04g / cm³And a thickness of 60 mm. Skin layer 2: polyester fiber with a fiber diameter of 1 denier
(Melting point 250 ° C) manufactured by the spunbond method.
Woven cloth. 70g / m²0.46mm thick, apparent
Density 0.17g / cm³, The fiber gap is 100 μm or less
Was. After immersing this nonwoven fabric with a fluorine-based processing agent,
The dried and heat-treated one was used as a skin layer. Fluorine
The following processing agents were used. Asahi Glass AG-850 from Asahi Glass Co., Ltd. Dilute AG-850 with water, make a 5% solution and form a non-woven fabric
Spray applied. After application, it was dried at 120 ° C. for 5 minutes.
Thereafter, curing was performed at 150 ° C. × 8 minutes. (Used non-woven
(The cloth is Asahi Kasei Kogyo Co., Ltd., product number E01070) Adhesive layer 3 ... Polyester with fiber diameter of 10 to 15 denier
Non-woven fabric made of only low melting point (100 ° C) fibers. Ba
The basis weight of the inner fiber is 30 g / m.²And Core layer 1
The adhesive layer 3 on the adhesive layer 3 and the skin layer 2 on the adhesive layer 3
Laminate by heating and pressing at 160 ° C for 1 minute using an iron
A sound absorbing material was obtained.

[0015]Example 2  Using the same core material layer 1 and adhesive layer 3 as in Example 1, the skin layer 2
70g / m as basis weight², Thickness 0.33mm, span
Polyester with a fiber diameter of 1 denier manufactured by the lace method
Non-woven fabric was used. Add a silicone-based processing agent to this non-woven fabric.
After blasting, use the dried and heat-treated one as the skin layer.
Used. Use the following silicone processing agents
Was. SM870 of Dow Corning Toray Silicone Co., Ltd.
7 Add SM22K catalyst to SM8707, compared to SM8707
%, And further diluted with water to make a 5% solution.
Spray applied to woven fabric. 110 ° C x 5 minutes after application
After that, curing was performed at 150 ° C. for 5 minutes. (used
(The nonwoven fabric is Asahi Kasei Kogyo Co., Ltd., product number E0080).
Was.

[0016]Comparative Example 1  One composed only of the core material layer 1 of the first embodiment.

[0017]Comparative Example 2  350 g / m of a water repellent on one surface of the core material layer 1 of Example 1.²Paint
Clothed. As a water repellent, use a ceramic water repellent
Was.

FIG. 3 shows the results of measurement of the normal incidence sound absorption coefficient for each frequency in Examples 1 and 2 and Comparative Examples 1 and 2 described above. Reference signs A and B in the graph of FIG. 3 indicate Examples 1 and 2, and reference signs C and D indicate Comparative Examples 1 and 2, respectively. In Examples 1 and 2, it is clear that even if the skin layer 2 is present, the sound absorbing performance of the core layer 1 alone is hardly impaired.

[0019]

According to the present invention, an apparent density of 0.01
laminating a skin layer made of an organic fiber nonwoven fabric gap is water repellent treated with 200μm or less between the fibers in g / cm ³ or more apparent to one or both sides of the core material layer made of an organic fiber nonwoven fabric density 0.05 g / cm ³ or more As a result, the skin layer prevents water droplets from penetrating into the core layer, and noise is sufficiently input from the skin layer to the core layer, the sound absorption coefficient is not impaired, and the characteristics of the fiber laminated sound absorbing material are impaired. Nothing. In the case where an adhesive layer containing 60 to 100% by weight of the low melting point fiber is provided between the core material layer and the skin layer, a general adhesive is not used.
Since the low-melting fiber is melted to bond the core layer and the skin layer, the fiber-laminated sound-absorbing material is substantially composed of only fibers, which is excellent in working environment, recyclability, and cost. Further, the base material of the organic fiber nonwoven fabric has a fiber diameter of 15
In the case of using fibers of denier or less, the sound absorbing performance is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment.

FIG. 3 is a graph showing a normal incidence sound absorption coefficient for each frequency.

[Explanation of symbols]

 1 core material layer 2 skin layer 3 adhesive layer

Claims (3)

[Claims] 1. A gap between the fibers with an apparent density of 0.01 g / cm ³ or more apparent to one or both sides of the core material layer made of an organic fiber nonwoven fabric density 0.05 g / cm ³ or higher 200μm
A fiber laminated sound absorbing material in which a skin layer made of an organic fiber nonwoven fabric subjected to a water-repellent treatment is laminated below. 2. A low-melting fiber is provided between the core layer and the skin layer.
The fiber laminated sound absorbing material according to claim 1, wherein an adhesive layer containing 0 to 100% by weight is provided. 3. The organic fiber nonwoven fabric has a base material having a fiber diameter of 15
The fiber laminated sound absorbing material according to claim 1, wherein the fiber is a fiber having a denier or less.