阅读说明：本技术 轻质吸声材料及附着其的基材 (Light sound-absorbing material and base material attached thereto ) 是由 朴玄濬 于 2019-07-18 设计创作，主要内容包括：本发明涉及轻质吸声材料及附着其的基材,更详细地,涉及利用在纤维无纺布的上部面及下部面层叠有微细纤维层的三层薄膜纤维层,从而比现有的吸声材料更轻且提供更优秀的吸声性能的轻质吸声材料及附着其的基材。(The present invention relates to a lightweight sound-absorbing material and a substrate to which the same is attached, and more particularly, to a lightweight sound-absorbing material which is lighter than conventional sound-absorbing materials and provides more excellent sound-absorbing performance by using three thin film fiber layers in which fine fiber layers are laminated on upper and lower surfaces of a fiber nonwoven fabric, and a substrate to which the same is attached.)

1. A light sound-absorbing material is characterized in that,

the film fiber layer comprises a three-layer structure, and the three-layer structure film fiber layer comprises:

a fibrous nonwoven fabric formed of fibers having an average diameter of 10 to 20 μm; and

the upper and lower microfiber layers are formed of fibers having an average diameter of 2 to 6 μm, and are laminated on the upper and lower surfaces of the fibrous nonwoven fabric, respectively.

2. The sound-absorbing light material as claimed in claim 1, wherein the fibrous layer of said film has a weight per unit area of 30g/m ²To 100g/m ²。

3. The sound-absorbing light material as claimed in claim 1, wherein said thin film fiber layer has a thickness of 0.2mm to 1 mm.

4. The sound-absorbing light material as claimed in claim 1, wherein said fibrous layer of film has an air resistivity of 1000000pa.s/m ²To 5000000Pa.s/m ²。

5. The light sound-absorbing material according to claim 1, wherein said light sound-absorbing material is formed by stacking block layers in which a plurality of blocks are arranged at intervals on said lower end fine fiber layer, so that air gaps are formed between said blocks when attached to the base material.

6. The lightweight sound absorbing material of claim 5 wherein said block is a felt material or a foam material.

7. A base material to which the light sound-absorbing material according to any one of claims 1 to 6 is attached, wherein the base material comprises a plurality of protruding support portions protruding to the outside, and when the light sound-absorbing material is attached, air gaps are formed between the protruding support portions.

Technical Field

The present invention relates to a lightweight sound-absorbing material and a substrate to which the same is attached, and more particularly, to a lightweight sound-absorbing material which is lighter than conventional sound-absorbing materials and provides more excellent sound-absorbing performance by using three thin film fiber layers in which fine fiber layers are laminated on upper and lower surfaces of a fiber nonwoven fabric, and a substrate to which the same is attached.

Background

Sound absorbing materials are often used in vehicles, studios, theaters, and the like, and particularly in the case of automobiles, they are provided on a cowl panel for partitioning an engine compartment and a vehicle cabin in order to block noise generated in the engine compartment, or on a vehicle floor or the like in order to block noise transmitted from a vehicle bottom.

The sound absorbing material absorbs sound waves in the sound absorbing material during the process of converting sound wave energy into heat energy through movement. The fibrous layer used as the sound absorbing material converts acoustic energy transmitted to the inside into thermal energy by a vibration damping phenomenon based on the viscous resistance of air and the viscoelastic characteristics of the fibers forming the fibrous layer, and finally reduces noise. Thus, the performance of the fiber-based sound absorbing material depends on the thickness of the fibers forming the fiber layer, the areal density or thickness of the fiber layer, and the like. If the thickness of the fiber is reduced, more fiber can be put in, and finally the void ratio is increased, so that the sound absorption performance can be improved. Further, if the surface density and thickness of the fiber layer are increased, the void ratio and the sound wave dissipation path become longer, and the sound absorption performance is improved. Therefore, in the case of a sound-absorbing material for a vehicle, a sound-absorbing material of high weight and high luminance is used, and in this case, although the sound-absorbing performance is improved, a problem of a decrease in fuel efficiency occurs with an increase in the weight of the vehicle.

Disclosure of Invention

In order to solve the above-described problems, an object of the present invention is to provide a lightweight sound-absorbing material which is lighter and more excellent than conventional sound-absorbing materials by using three thin film fiber layers in which fine fiber layers are laminated on upper and lower surfaces of a fiber nonwoven fabric.

It is still another object of the present invention to provide a sound-absorbing material further having improved sound-absorbing performance by stacking block layers in which an air gap is formed so as to maintain a predetermined distance between the base materials attached to the sound-absorbing material.

Another object of the present invention is to provide a base material in which a plurality of protrusions are formed outside the base material to which the sound absorbent is attached, thereby forming air gaps between the protruding supports when the light sound absorbent is attached.

To this end, the lightweight sound absorbing material of the present invention is characterized by comprising a three-layer structure film fiber layer comprising: a fibrous nonwoven fabric formed of fibers having an average diameter of 10 to 20 μm; and an upper end fine fiber layer and a lower end fine fiber layer, which are formed of fibers having an average diameter of 2 to 6 μm and are laminated on the upper surface and the lower surface of the fibrous nonwoven fabric, respectively.

The weight per unit area of the above film fiber layer may be 30g/m ²To 100g/m ²The thickness may be 0.2mm to 1mm, and the air resistivity may be 1000000Pa.s/m ²To 5000000Pa.s/m ²。

In the light sound absorbing material according to the present invention, the fine fiber layer laminated on the lower surface of the fibrous nonwoven fabric is further laminated with a block layer in which a plurality of blocks are arranged at intervals, so that air gaps can be formed between the blocks when the material is attached to the base material.

The block may be of felt or foam (foam) material.

According to the base material to which the light sound absorbing material is attached of the present invention, the base material includes a plurality of protruding support portions protruding to the outside, and an air gap may be formed between the protruding support portions when the light sound absorbing material is attached.

The light sound-absorbing material and the base material attached thereto of the present invention have the following effects.

1. The fibrous layer of the film having a three-layer structure of the present invention has high air resistivity compared to a sound absorbing material having a single-layer structure with the same areal density, and thus is excellent in sound absorbing performance.

2. When the above-described film fiber layer is further laminated with a block layer having a plurality of blocks arranged with a space left, the sound wave dissipation path can be made long without significantly increasing the areal density of the sound absorbing material, so that the sound absorbing performance can be further improved.

3. In addition, when the light sound-absorbing material of the present invention is attached to the base material, in the case where the base material includes a plurality of protruding support portions that protrude outward at intervals, air gaps are formed between the base material and the light sound-absorbing material due to the protruding support portions, so that the sound wave dissipation path can be lengthened, and the sound absorption performance can be further improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a lightweight sound absorbing material of the present invention formed of a fibrous layer of a film having a three-layer structure.

Fig. 2 is a schematic cross-sectional view of a lightweight sound absorbing material in which block layers are laminated on the thin film fiber layer of fig. 1.

Fig. 3 is a schematic cross-sectional view illustrating a state in which the light sound absorbing material of fig. 1 is attached to a substrate.

Fig. 4 is a graph comparing the sound absorption performance of the lightweight sound absorbing material of fig. 1 with that of a prior art sound absorbing material.

Fig. 5 is a graph of sound absorption performance for various air resistivity of the lightweight sound absorbing material of fig. 1.

Description of the attached drawings

100: light sound-absorbing material

110: film fiber layer 111: fiber non-woven fabric

112: upper-end microfiber layer 113: lower end fine fiber layer

130: block layer 131: block

200. 200': base material 210: protruding support part

300: air gap

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The drawings in the present invention may be exaggerated in order to distinguish, clarify, and facilitate understanding of the technology from the prior art. Also, the terms described below are terms defined in consideration of functions of the present invention, which may be changed according to intentions or conventions of a user or an operator, and therefore, should be defined based on the overall technical contents in the present specification. On the other hand, the embodiments are merely illustrative of the structural elements set forth in the scope of the claims of the present invention, and do not limit the scope of the claims of the present invention, which should be interpreted based on the technical ideas in the entire specification of the present invention.

First embodiment

Hereinafter, a lightweight sound absorbing material formed of a thin film fiber layer in a first embodiment of the present invention will be described with reference to fig. 1. Fig. 1 is a schematic cross-sectional view of a film fiber layer 110 having a three-layer structure, wherein the film fiber layer 110 is formed of a fiber nonwoven fabric 111 and fine fiber layers 112 and 113 laminated on the upper and lower surfaces of the fiber nonwoven fabric, respectively.

The fibrous nonwoven fabric 111 is formed of fibers having an average diameter of 10 to 20 μm, and the upper end fine fiber layer 112 and the lower end fine fiber layer 113 laminated on the upper surface and the lower surface of the fibrous nonwoven fabric 111 are formed of fibers having an average diameter of 2 to 6 μm.

The fibers forming the fiber nonwoven fabric 111 and the fine fiber layers 112 and 113 may be polymers that can be generally used as sound absorbing materials, and may be representatively one or more selected from the group consisting of polyethylene, polypropylene, polyamide copolymer, polyurethane, polyester copolymer, polyvinyl acetate, and polyvinyl alcohol.

The fiber nonwoven fabric 111 serves to improve the physical properties (tensile strength) and air resistance of the film fiber layer 110. When the average diameter of the fibers forming the fiber nonwoven fabric 111 is 10 μm to 20 μm, the air resistivity can be improved to a predetermined value or more.

The fine fiber layers 112 and 113 function to convert acoustic energy into thermal energy or vibrational energy while increasing the air resistivity. It is preferable that the average diameter of the fibers forming the upper end fine fiber layer 112 and the lower end fine fiber layer 113 is 2 μm to 6 μm because the sound absorption performance is increased by increasing the air resistivity with respect to the weight within the above range.

Preferably, the above-mentioned membrane fiber layer 110 is used per unit areaThe weight is 30g/m ²To 100g/m ²And the thickness is 0.2mm to 1mm because of excellent sound absorption property with respect to price in the above range.

Further, it is preferable that the air resistivity of the thin film fiber layer 110 is 1000000Pa.s/m ²To 5000000Pa.s/m ²As confirmed in fig. 5, because better sound absorption performance can be obtained within the above range.

The thin film fiber layer 110 of the first embodiment of the present invention has a higher air resistivity than a fiber layer formed of a single layer, which can be confirmed by the comparative experiment result shown in fig. 4. Fig. 4 is a graph of a comparative experiment of sound absorption performance between the thin film fiber layer 110 of the present invention and a conventional fiber layer formed of a single layer. The following inventive film fiber layers 110 were used in this experiment: the upper end fine fiber layer 112 and the lower end fine fiber layer 113 of a polyethylene terephthalate (PET) fiber nonwoven fabric 111 having an average diameter of 30 μm were laminated with fibers of a polypropylene (PP) material having an average diameter of 3 μm, and the areal density was 70g/m ². Furthermore, the conventional fiber layers were formed of only a single material of polypropylene having an average diameter of 3 μm, and the areal densities thereof were respectively set to 45g/m ²、65g/m ²、75g/m ²The fiber layer of (3) was used as a comparative example. In this experiment, in order to measure the sound absorption performance, the thin film fiber layer 110 of the present invention and the existing fiber layer were fixed to a resistance tube in such a manner that the thickness of the air gap became 10mm, and the sound absorption performance was measured by a test tube method.

As a result, the sound absorption performance of the sound absorbing material 100 is improved as the areal density is increased, but the light sound absorbing material 100 of the present invention (areal density of 70 g/m) ²) Compared with the prior sound absorption material (the areal density is 75 g/m) ²) In contrast, it was confirmed that the sound absorption performance was excellent in a low frequency band of 3000Hz or less. In particular, since the low frequency band is a noise frequency band generated when the automobile is running, the sound absorption effect can be further improved when the film fiber layer 110 is applied to the interior of the automobile.

Second embodiment

Hereinafter, a light sound-absorbing material 100 according to a second embodiment of the present invention will be described with reference to fig. 2. Fig. 2 shows a form in which the block layer 130 is laminated on the film fiber layer 110 of the first embodiment. The block layer 130 is laminated on the lower end fine fiber layer 113 of the thin film fiber layer 110 so as to be formed with a plurality of blocks 131 at equal intervals or different intervals. If such the above-described light sound absorbing material 100 is attached to the base material 200, air gaps 300 are formed between the blocks 131 forming the above-described block layer 130. As a result, the areal density of the lightweight sound-absorbing material 100 can be further reduced, and therefore, compared to a conventional sound-absorbing material having a single-layer structure with the same thickness, the lightweight sound-absorbing material can be reduced in weight and cost, and has excellent sound-absorbing performance. The block 131 may be felt (felt) material or polymer foam (foam).

Third embodiment

Hereinafter, a light sound-absorbing material 100 according to a third embodiment of the present invention will be described with reference to fig. 3. Hereinafter, an additional inventive substrate 200 that forms an air gap when the lightweight sound absorbing material 100 of the present invention is attached will be described with reference to fig. 3. Fig. 3 shows a state where the lightweight sound absorbing material 100 formed of the thin film fiber layer 110 of the first embodiment is attached to the above-described base material 200'. The base material 200' is attached to the base material by protruding the plurality of protruding supports 210 to the outside and contacting the lightweight sound-absorbing material 100 with the plurality of protruding supports 210, and after the attachment, air gaps 300 are formed between the protruding supports 210. The height of the protruding support portion 210 may be 4mm to 20mm, and the protruding support portion 210 may be formed in the injection molding process of the base material 200' or may be integrated with the planar base material through a separate bonding process.

As described above, the present invention has been explained by referring to the embodiments shown in the drawings, but this is merely illustrative, and it should be understood that various modifications and equivalent other embodiments can be made based on the ordinary knowledge in the art to which the present technology pertains. Therefore, the true technical scope of the present invention depends on the technical scope described and is determined based on the specific contents of the above invention.