KR20210099704A - Acoustic absorber of automobile floor carpet using PET fiber - Google Patents

Abstract

The present invention relates to a vehicle flow carpet sound absorbing and insulating material The present invention relates to a flow carpet sound absorbing and insulating material having excellent sound absorption and sound insulation properties while being lightweight, by forming a polyester sound absorbing and insulating material into a multi-layered structure. That is, in a case of an existing vehicle flow carpet, a high-density layer called a heavy layer is inserted into carpet fabrics to improve sound insulation. Therefore, there were problems such as heavy weight, an increase in a manufacturing cost, and environmental pollution due to difficulties in recycling. In the present invention, in order to improve this problem, by stacking different polyester sound absorbing and insulating materials, a sound insulation performance was improved, and a weight was reduced by eliminating the heavy layer. The vehicle flow carpet sound absorbing and insulating material of the present invention is composed of equal to or more than two layers of polyester sound absorbing and insulating materials having different apparent densities, which are made of a low-melting polyester fiber and a high-melting polyester fiber.

Description

Flow carpet sound absorbing and insulating material using PET fiber {Acoustic absorber of automobile floor carpet using PET fiber}

The present invention relates to a sound absorbing and insulating material for a flow carpet for automobiles, and more specifically, it is manufactured through needle punching and a general faceting process so that the apparent density is different after mixing a low-melting-point polyester binder and a high-melting-point polyester fiber in a predetermined weight ratio. It relates to a flow carpet base material that maximizes sound absorption and sound insulation performance by complicating the transmission path of noise by stacking them after the process is completed.

In general, the noise introduced by the automobile flow carpet is largely divided into the noise generated by the engine entering through the vehicle body and the noise generated when the tire and the road surface are in contact through the vehicle body. There are two ways to improve this noise: improving the sound absorption performance and improving the sound insulation performance. Sound absorption means that the generated sound energy is transferred through the internal path of the material and is converted into thermal energy and disappears. is reflected and blocked by the shield.

The sound absorption performance is mainly related to the internal shape of the material, and the sound insulation performance is closely related to the density and structure of the material. In other words, in order to satisfy the sound absorption performance, there must be a lot of fine open cell particles like urethane foam, and it is already known that in the case of felt, a fiber with a low fineness must be used. In order to improve the sound insulation performance, it is a common technology to use a heavy layer material, which is a separate sound insulation material.

Polyurethane foam has been widely used as a sound-absorbing material that has been used in the past to suppress noise. However, in the case of urethane foam, sound absorption is excellent, but sound insulation is deteriorated. are using

However, in this case, the sound insulation is improved to some extent, but the total assembly weight increases due to the insertion of the high-density heavy layer, which lowers the fuel efficiency of automobiles and increases the manufacturing cost due to the need to prepare a separate mold for urethane foam. there is In addition, since such a heavy layer cannot be recycled after use, problems such as environmental problems and separate disposal costs occur.

Accordingly, recently, many products have been used that use polyester from which the heavy layer is removed to lower the weight and improve sound absorption and sound insulation performance. However, these products are superior to the conventional resin felt or needle felt, but there is a problem that the sound absorption and sound insulation performance is somewhat inferior compared to the products using urethane foam.

The present invention made it a technical task to lower the weight while improving sound absorption and sound insulation performance, which are problems of conventional products. The sound absorbing and insulating performance was improved by eliminating the heavy layer used in the existing flow carpet and instead of arranging the structure of the sound absorbing and insulating material into a sound absorbing zone and a sound insulating zone in multiple layers.

In one embodiment, the vehicle flow carpet sound absorbing and insulating material is composed of two or more layers of polyester sound absorbing and insulating materials with different apparent densities made of low-melting polyester fibers and high-melting polyester fibers, and has sound insulation (transmission loss) at less than 2500 Hz. This is 10 dB or more, and the sound insulation (transmission loss) at 2500-5000 Hz or less is 30 dB or more.

The polyester sound absorbing and insulating material includes those having an apparent density of 60 to 140Kg/m 3 in the case of the first stage and 160 to 280 Kg/m 3 in the case of the second stage.

The polyester sound absorbing and insulating material includes four layers of sound absorbing and insulating materials having different apparent densities.

The polyester sound absorbing and insulating material includes those having an apparent density of 60 to 140Kg/m3 for the first layer, 160 to 280Kg/m3 for the second layer, and 60 to 280Kg/m3 for the third and fourth layers.

The flow carpet sound absorbing and insulating material for a vehicle according to the present invention has an effect of improving the fuel efficiency of a vehicle by improving the weight increase caused by the insertion of a heavy layer, which is a problem with the existing flow carpet sound absorbing and insulating material, and at the same time, it is possible to improve both sound absorption and sound insulation Accordingly, it has the effect of lowering the manufacturing cost.

1 is a cross-sectional view of a flow carpet sound absorbing and insulating material for a vehicle according to the present invention.
2 is a cross-sectional view of a conventional vehicle flow carpet sound absorbing and insulating material.

The present invention described below can apply various transformations and can have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description.

However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Also, terms such as first, second, etc. may be used to distinguish and describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, when at least two different embodiments are described in the present application, all or part of the components may be used by merging and mixing with each other even if there is no particular description within the scope not departing from the technical spirit of the present invention. .

Sound insulation is expressed as a sound pressure value called Transmission Loss (dB). do.

Referring to FIG. 1, the polyester sound absorbing and insulating material 100, which had been composed of a single layer, was composed of two or more layers and combined by a general bonding method using a water-soluble adhesive, and then attached to a carpet fabric with a PE film layer. . Preferably, the polyester sound absorbing and insulating material 100 has a low apparent density of 60 to 140Kg/m3 in the case of the first stage 10 and a high density of 160 to 280Kg/m3 in the second stage 20. The reason for using a low-density sound absorbing and insulating material of 140Kg/㎥ is to keep the surface soft and increase the adhesion to the floor plate of general automobiles, thereby preventing the material from splashing when vibration occurs and at the same time suppressing noise leakage. . And the reason for applying the high-density sound absorbing and insulating material of 160~280Kg/㎥ is to induce the loss of sound by causing reflection and refraction when the noise passing through the low-density material of the first stage passes through the high-density material of the second stage. For this reason, continuous reflection and refraction are made by applying high-density materials to the first and second stages as well.

In the present invention, there is provided a flow carpet sound absorbing and insulating material for a vehicle having a sound insulation (transmission loss) of 10 dB or more at less than 2500 Hz and a sound insulation (transmission loss) of 30 dB or more at 2500 to 5000 Hz or less. ) has the effect of lowering the total assembly weight by at least 10% while exhibiting performance equal to or higher than that of the existing flow carpet.

Also, in the present invention, as shown in FIG. 1, the polyester sound absorbing and insulating material 100 may be composed of four layers, and a low-density material having an apparent density of 60 to 140 kg/m3 is used in the lowest part (hereinafter, the first stage) 10. , the back side (hereinafter referred to as the second stage) (20) is composed of a material layer having an apparent density of 160 to 280Kg/m3, and the third layer (30) and 4 having an apparent density of 60 to 280Kg/m3 on the back side of the second stage material The stage 40 may be made of material.

The advantage of the four-stage configuration is that it makes it possible to improve sound insulation (transmission loss) while lowering the overall weight by complicating the sound transmission path than in the case of the two-stage configuration.

The difference in sound insulating performance between the configuration of the sound absorbing and insulating material of the present invention and the existing material configuration as described above will become more apparent from the examples described below. However, the present invention is not limited to the following examples.

[Example 1]

After forming a web by mixing low-melting-point polyester fibers and high-melting-point polyester fibers, the polyester sound absorbing and insulating material 100, which was heat-dried, was manufactured at different pressures and temperatures, and the apparent density was 80 Kg/㎥ and thickness 5mm. The first-stage sound absorbing and insulating material 10 and the second-stage sound absorbing and insulating material satisfying an apparent density of 160Kg/m3 and 5mm in thickness are manufactured. , 40), the second stage sound absorbing and insulating material 20 is attached to the back side of the first stage 10 and assembled, and then attached to the carpet fabric with the PE film layer with an areal density of 600 g/m2, and the total weight is measured in unit square meters. After making an assembly of 3.8 kg per sugar, the sound insulation performance was measured using a sound insulation measurement facility.

[Example 2]

It was prepared in the same manner as in Example 1, except that the weight of the PE film layer on the carpet fabric was changed to 800 g/m 2 and the total weight of the assembly was adjusted to 4.0 Kg per unit square meter.

[Examples 3-4]

As shown in Table 1, the thickness of the first stage 10 and the thickness of the second stage 20 were reduced to 15 mm while deleting the third and fourth stage sound absorbing and insulating materials 30 and 40 on the second stage sound absorbing and insulating material 20 of Example 1 and the total weight was increased by 200gTlr, and the weight of the PE film layer was 800g/m2 as in Example 2, so that the total weight of the assembly was adjusted to 4.2 and 4.4Kg per unit square meter, respectively. It was the same as in Example 1 .

[Comparative Examples 1-2]

The same procedure as in Example 1 was performed except that a heavy layer was attached to the carpet fabric, and one layer of polyurethane foam or polyester was used as a sound absorbing and insulating material. The sound-insulating performance of the sound absorbing and insulating materials of Examples and Comparative Examples was evaluated using a sound-insulating performance measuring device called Apmat from Reiter, Switzerland. To put it simply, the sound insulation performance measuring device consists of an excitation chamber, a part that generates noise, a sample plate, a part where a sample to be measured for sound insulation is placed, and a sound-receiving chamber that measures the noise transmitted through the sample. The measured data is expressed as an insertion loss [dB] value as shown in Table 2 below, and the larger the value of the data, the better the sound insulation performance. In addition, the overall sound insulation and weight reduction effects of the sound absorbing and insulating materials of each Example and Comparative Example were mounted on a passenger car, and Table 3 shows.

division Overall Characteristics floor carpet Reconstruction of sound absorbing and insulating weight
(Kg/㎡) thickness
(mm) 1st stage
(Kg/㎥) 2nd stage
(Kg/㎥) 3 tier
(Kg/㎥) 4 tier
(Kg/㎥) Example 1 3.8 20 9oZ+PE600 80 160 160 160 Example 2 4.0 20 9oZ+PE800 80 160 160 160 Example 3 4.2 20 9oZ+PE800 80 180 - - Example 4 4.4 20 9oZ+PE800 80 200 - - Comparative Example 1 4.3 20 9oZ + Heavy Layer PU 100 - - - Comparative Example 2 4.3 20 9oZ + Heavy Layer PET 120 - - -

The carpet fabric used in Table 1 is 9oZ BCF.

division Sound insulation [dB] 500Hz 630Hz 800Hz 1000Hz 1250Hz 1600Hz 2000Hz 2500Hz 3150Hz 4000Hz 5000Hz Example 1 12.5 16.5 20.2 24.9 27.5 27.7 28.5 30.9 33.6 34.7 35.9 Example 2 10.9 16.9 19.7 24.0 28.3 28.6 29.5 31.1 33.7 36.3 37.2 Example 3 11.0 17.5 22.5 21.1 22.9 24.5 27.6 30.7 34.1 39.5 45.4 Example 4 11.0 18.1 24.3 21.3 25.8 26.5 28.3 31.7 36.3 41.0 47.6 Comparative Example 1 10.7 15.5 17.8 22.7 26.9 28.2 28.1 32.2 33.1 37.7 40.2 Comparative Example 2 6.2 13.9 17.9 18.6 20.5 20.1 20.2 22.1 24.2 25.4 27.3

The sound insulation data are values measured using an Apamat-2 (Apamat-II, Reiter, Switzerland) test facility.

The higher the numerical value of the data, the better the sound insulation performance.

division total weight
(Kg/set) thickness
(mm) Sound insulation evaluation Weight reduction effect
(Kg/set) Example 1 8.74 20 Great -1.15 Example 2 9.20 20 Great -0.69 Example 3 9.66 20 Great -0.23 Example 4 10.1 20 Great +0.20 Comparative Example 1 9.89 20 standard - Comparative Example 2 9.89 20 Inadequate 0

As described in detail above, the flow carpet sound absorbing and insulating material for vehicles according to the present invention has an effect of improving the fuel efficiency of automobiles by improving the weight increase caused by the insertion of the heavy layer, which is a problem with the existing flow carpet sound absorbing and insulating materials, and at the same time, the sound absorption and As it is possible to improve the sound insulation, it has the effect of lowering the manufacturing cost.

On the other hand, the embodiments disclosed in the drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

100: polyester sound absorbing and insulating material 10: 1 stage
20: 2nd stage 30: 3rd stage
40 : 4 steps

Claims (2)

In the flow carpet sound absorbing and insulating material for a vehicle,
It is composed of two or more layers of polyester sound absorbing and insulating material with different apparent densities made of low-melting polyester fiber and high-melting polyester fiber, and has a sound insulation (transmission loss) of 10 dB or more at less than 2500 Hz and Sound insulation (transmission loss) is 30dB or more,
Polyester sound absorbing and insulating material for vehicle flow carpets with an apparent density of 70~130Kg/m3 for the first layer and 180~260Kg/m3 for the second layer. According to claim 1,
The polyester sound absorbing and insulating material is composed of four layers of sound absorbing and insulating materials having different apparent densities,
A sound absorbing and insulating material for flow carpets for vehicles with an apparent density of 70~130Kg/m3 for the first layer, 180~260Kg/m3 for the second layer, and 70~260Kg/m3 for the third and fourth layers.

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