KR20140050214A - Fiber aggregate having excellent sound absorption performance and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fiber aggregate with improved sound absorption performance and a manufacturing method thereof, and more specifically, to a fiber aggregate which improves sound absorption performance by forming a large surface area and an air layer to maximize viscosity loss and dissipation path of incident sound energy and can show improved sound absorption performance in a low frequency band. Moreover, the present invention relates to the fiber aggregate and the manufacturing method thereof, wherein the fiber aggregate enables light weight design by expressing improved sound absorption performance and maintains intrinsic properties without the change of a shape for a long period of time after manufacture by obtaining improved compression recovery rates.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fiber aggregate having excellent sound absorption performance,

The present invention relates to a fiber aggregate having excellent sound absorption performance and a manufacturing method thereof, and more particularly to a fiber aggregate having a large surface area and an air layer to exhibit an improved sound absorption rate and excellent sound absorption performance with excellent compression recovery characteristics.

Such as a vacuum cleaner, a dishwasher, a washing machine, an air conditioner, an air purifier, a computer, a projector, and the like, and the problem of noise pollution becomes more serious. Therefore, efforts to block or reduce the noise generated from various noise sources in the modern life are continuing, and in the developed countries, the legal regulations to regulate the noise level between the interlayer and the generation of apartment houses and apartments are increasingly strict . In addition, the noise introduced into the automobile interior is typically generated by the engine, such as the engine noise transmitted through the vehicle body or the air, and the friction sound with the wheel and the ground. In order to suppress such noise, the engine cover and the hood insulation are used The effect of reducing the noise is insignificant, and the dash outer, the dash inner, and the floor carpet attached to the outside of the vehicle play a role of removing most of the noise.

There are two ways to improve the noise. One is to improve the sound absorption performance and the other way to improve the sound insulation performance. Sound absorption is the sound energy that is transmitted through the inner path of the material and is converted into heat energy and disappears. And is reflected and shielded by the shield.

Felt, sponge, polyurethane foam and the like are conventionally used as a conventional sound absorbing and sound insulating material. In addition, sound absorbing materials impregnated with a thermoplastic resin or a thermosetting resin in a compressed fiber, a glass fiber, a rock surface, . However, most of the sound absorbing materials described above have insufficient sound insulating properties, and most of the sound absorbing materials contain harmful components to the human body.

In recent years, regulations on environmental friendliness and recyclability have gradually been strengthened, and the use ratio of fiber-absorbing materials based on thermoplastic resin such as PET or PP (polypropylene) is increasing. In order to reduce carbon dioxide, the regulation of fuel efficiency of the vehicle is gradually increasing. The improvement of fuel efficiency can be attained through the weight reduction of parts, so it is necessary to develop lightweight sound absorbing material with improved performance.

Accordingly, research and development on a sound absorbing material which is harmless to the human body and excellent in the sound absorbing function capable of effectively absorbing and reducing the noise while reducing the thickness has been actively conducted.

As a sound absorbing material that has been conventionally researched and developed, there is disclosed a sound absorbing material which is a web in which general short fibers having a diameter of 10 탆 or more are crimped to a general meltblown fiber in an amount of 10 wt% or more, A sound absorbing material and a heat insulating material which are in the form of a web containing a silane coupling agent and a silane coupling agent are disclosed. However, since the porosity of a web made of a general meltblown fiber is very large and the structure is not so dense, , There is a problem that the thickness of the sound absorbing material must be greatly increased to provide a sufficient sound absorbing effect.

 Although a three-dimensional nonwoven web made of a meltblown microfine fiber is disclosed, a three-dimensional nonwoven web has a large porosity and thus is not densely structured, resulting in insufficient durability. It is necessary to increase the thickness of the three-dimensional nonwoven web significantly, and it is difficult to manufacture the nonwoven web composed of three dimensions as described above, which increases the manufacturing cost significantly.

 In addition, meltblown nonwoven fabrics having a single structure having a density of 50 to 4,000 g / m 2 made of fibers having an average diameter of 0.1 to 20 μm have been disclosed in meltblown nonwoven fabrics having excellent sound absorption properties and heat insulating properties, The nonwoven fabric also has a problem that the soundproofing performance is not improved much as compared with the conventional sound absorbing material.

In addition, although a sound absorbing material is disclosed in which staple fibers that can be fused to the meltblown fibers by heat are included in order to impart steric stability, such a sound absorbing material still has a problem of insufficient soundproofing performance.

In addition, a sound absorbing material using a honeycomb structure having a plurality of spaces together with meltblown fibers has been disclosed. However, such a sound absorbing material is insufficient in soundproof performance and has a problem in that it is limited in its application because of lack of flexibility.

However, the development of a sound-absorbing material exhibiting a superior sound-absorbing effect while reducing the thickness and weight of the sound-absorbing material is insufficient, and development of a shielding product that provides sufficient sound-absorbing property even at a low frequency is still required In fact.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to improve a sound absorption rate by forming an air layer with a large surface area capable of maximizing viscous loss and dissipation path of incident sound energy, And it is an object of the present invention to provide a fiber aggregate excellent in sound absorption performance which can realize an excellent sound absorption performance even when using fibers and can be designed to be lightweight. Also, it is an object of the present invention to provide a fiber aggregate having excellent compression recovery rate, which can maintain its inherent characteristics without changing its shape for a long period of time after its manufacture, and which exhibits an excellent sound absorption performance not only in a high frequency band but also in a low frequency band, and a manufacturing method thereof.

 In order to solve the above problems, the present invention,

 (EN) Disclosed is a fiber aggregate excellent in sound absorption performance, which comprises a meltblown fiber and a polymetallic staple fiber satisfying the following relational expression (1).

[Relation 1]

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm))

According to a preferred embodiment of the present invention, the polymorphic staple fiber may be at least one selected from the group consisting of a hexagonal star shape, a three-point flat shape, a six-leaf shape, and an eight-leaf shape.

According to another preferred embodiment of the present invention, the fiber length of the polymorphic cross-section staple fiber may be 22 to 64 mm.

According to another preferred embodiment of the present invention, the fineness of the polymorphic cross section staple fiber may be 1 to 10 D.

According to another preferred embodiment of the present invention, the meltblown fiber may have a diameter of 1.0 to 20.0 μm.

According to another preferred embodiment of the present invention, the fibrous aggregate may contain 15 to 65% by weight of polymorphic staple fibers.

In addition, the present invention meltblown fibers (meltblown fiber) and polymorphism section short fibers in the fiber aggregate comprising the (staple fiber), the Absorption Coefficient measured by Alpha Cabin method in thickness 16mm or less, the area density 350g / m ² or less A fiber aggregate excellent in sound absorption performance with 0.73 or more at 1000 Hz, 0.94 or more at 2000 Hz, and 1.03 or more at 5000 Hz.

According to a preferred embodiment of the present invention, the polymorphic cross-section staple fiber may satisfy the following relational expression (1).

[Relation 1]

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm))

According to another preferred embodiment of the present invention, the fibrous aggregate may contain 15 to 65% by weight of staple fibers of polymorphic cross section.

The present invention also provides a method for producing a staple fiber, comprising the steps of: (1) preparing a staple fiber having a polymorphic shape satisfying the following relational expression 1; And (2) mixing the staple fibers of the polymorphic type in the course of spinning the meltblown fibers. The present invention also provides a method of producing a fiber aggregate having excellent sound absorption performance.

[Relation 1]

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm))

According to a preferred embodiment of the present invention, the polymorphic staple fiber may be at least one selected from the group consisting of a hexagonal star shape, a three-point flat shape, a six-leaf shape, and an eight-leaf shape.

According to another preferred embodiment of the present invention, the fibrous aggregate may contain 15 to 65% by weight of staple fibers of polymorphic cross section.

The fiber aggregate having excellent sound absorption performance of the present invention can improve the sound absorption rate by forming a large surface area and an air layer so as to maximize the viscous loss and dissipation path of the incident sound energy, and can exhibit an excellent sound absorption rate even in a low frequency band. In addition, it is possible to realize a lightweight design that can exhibit excellent sound absorption performance by using a small amount of fibers, and a fiber aggregate having excellent sound absorption performance, which has excellent compression recovery rate and can maintain its inherent characteristics after long- And a manufacturing method thereof can be provided.

1 is a cross-sectional view of a fiber assembly according to a preferred embodiment of the present invention.
FIG. 2 is a hexagonal star-shaped polymorphic cross section fiber included in a fiber aggregate according to a preferred embodiment of the present invention.
Fig. 3 is a three-bar flat polygonal cross-section short fiber included in a fiber aggregate according to a preferred embodiment of the present invention.
FIG. 4 is a six-leaf type polymorphic cross-section short fiber included in a fiber aggregate according to a preferred embodiment of the present invention.
Fig. 5 is an 8-leaf type polymorphic cross-section short fiber included in a fiber aggregate according to a preferred embodiment of the present invention.
FIG. 6 is a view showing L and W as examples of 8-leaf type polymorphic cross-section short fibers according to a preferred embodiment of the present invention.

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

As described above, the conventional sound absorbing product has a problem of increasing the area density and thickness of the fiber aggregate in order to improve the sound absorption performance and the sound insulation performance by increasing the porosity and the sound dissipation path. In particular, There is a problem that can not be done. In addition, there has been a problem that the sound absorption performance is reduced due to compression and shape deformation caused by external force generated after transportation, storage, or attachment.

 Accordingly, the present invention provides a fiber aggregate excellent in sound absorption performance, which comprises a meltblown fiber and a staple fiber having a polymorphic shape satisfying the following relationship (1) Respectively.

[Relation 1]

(A: 섬유 단면적(μm²), P: 섬유단면 둘레의 길이(μm))

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm))

Through this, it is possible to improve the sound absorption rate by forming a large surface area and an air layer to maximize the viscous loss and dissipation path of the incident sound energy. In particular, it can exhibit an excellent sound absorption rate even in a low frequency band. In addition, it is possible to realize a lightweight design that can exhibit excellent sound absorption performance by using a small amount of fibers, and a fiber aggregate having excellent sound absorption performance, which has excellent compression recovery rate and can maintain its inherent characteristics after long- And a manufacturing method thereof can be provided.

 1 is a cross-sectional view of a fiber aggregate having excellent sound absorption performance according to a preferred embodiment of the present invention. The meltblown fiber aggregate 10 includes a meltblown fiber 11 and a staple fiber fiber (12). The meltblown fiber aggregate 10 has a fine structure in terms of its structure and has a sound absorbing function to a considerable extent. However, in order to greatly reduce the thickness of the meltblown fabric 10, The meltblown fiber aggregate 10 can be formed by separately including a staple fiber 12 that is made of a nonwoven fabric. For this purpose, staple fibers 12 may be mixed in the inside of the melt-blown fiber aggregate to be uniformly dispersed.

 First, the meltblown fiber 11 forming the fiber aggregate 10 of the present invention is not particularly limited as long as it is melt-blown to form meltblown fiber, More preferred are high-pressure processed low-density polyethylene, linear low-density polyethylene (LLDPE), high-density polyethylene (LLDPE), and high-density polyethylene, which are the sole or copolymer of alpha-olefins such as ethylene, propylene, 1-butene, Polypropylene (propylene homopolymer), polypropylene random copolymer, poly 1-butene, poly 4-methyl-1-pentene, ethylene propylene random copolymer, ethylene 1-butene random copolymer, propylene 1- (Polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate and the like), polyamide (nylon Poly (vinyl chloride), ethylene-vinyl acetate copolymer, ethylene vinyl acetate vinyl alcohol copolymer, ethylene (meth) acrylic acid copolymer, ethylene-acrylic acid ester- Carbon monoxide copolymer, polycarbonate, polystyrene, ionomer, or a mixture of two or more thereof.

The diameter of the meltblown fiber 11 may be 1.0 to 20.0 [mu] m. If the diameter of the meltblown fiber (11) is less than 1.0 μm, the manufacturing cost may be greatly increased due to the decrease in productivity, and there may be a problem that the sound absorption performance is decreased due to the reduction of the thickness and compression recovery rate. The structure of the fibrous aggregate is not formed densely, which may result in a problem of sound absorption performance and durability deterioration of the sound absorbing material.

(A: 섬유 단면적 (μm²), P: 섬유단면 둘레의 길이 (μm)) 와 같이 계산되는

값이 1.5 이상을 만족하는 것으로, 기존의 섬유집합체 흡음재에 사용되는 단섬유(staple fiber)에 비하여 넓은 표면적이 확보되고 흡음률 및 투과 손실을 향상시킬 수 있으며, 나아가 우수한 압축회복률을 나타낼 수 있다. 일반적으로 음파는 특정 재료와 마찰하게 되면 점성 손실이 발생하게 되고, 이는 음파의 기계적 에너지가 열에너지로 변환되면서 결국 소음이 감소하는 결과를 가져온다. 동일 중량의 섬유집합체로 입사되는 음파에 대한 에너지 손실률을 높여서 소음을 감소시키기 위해서는 음파의 점성 손실이 발생하는 섬유의 표면적이 증가할수록 유리하다.Next, the staple fibers 12 of the polymorphic cross section included in the fiber aggregate 10 of the present invention,

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm))

Value satisfies 1.5 or more, a large surface area can be secured as compared with a staple fiber used in a conventional fiber aggregate sound absorbing material, the sound absorption rate and transmission loss can be improved, and furthermore, excellent compression recovery rate can be obtained. Generally, when a sound wave rubs against a specific material, a viscous loss is generated, which results in a reduction in the mechanical energy of the sound wave converted into heat energy, resulting in a reduction in noise. In order to reduce the noise by increasing the energy loss rate for the sound waves incident on the same weight fiber aggregate, it is advantageous as the surface area of the fiber in which the viscous loss of the sound waves is increased increases.

값이 1.5 미만일 경우 단섬유(staple fiber)(12) 표면적이 작아 효과적으로 흡음 성능을 구현하기 위해서는 많은 양의 단섬유(staple fiber)(12)가 필요하여 경량화 설계가 불가능한 문제점이 있다.

값이 클수록 섬유 표면적이 넓은 것을 뜻하므로 보다 바람직하게는 본 발명에서 사용되는 다형 단면 단섬유(staple fiber)(12)는 상기

값이 1.8 이상일 수 있으며, 더욱 바람직하게는 1.8 내지 3.0 일 수 있다. 본 발명에서 사용되는 다형 단면 단섬유(staple fiber)(12)의

값이 3.0을 초과할 경우 구금 제작 비용 증가, 냉각 효율 향상 관련 설비 교체, 고화속도 개선을 위한 고분자 개질, 생산성 저하 등으로 인해 결과적으로 제조 비용 상승을 초래하는 문제가 발생할 수 있다.
remind

If the value is less than 1.5, the staple fiber 12 has a small surface area, so that a large amount of staple fibers 12 are required to effectively implement the sound absorption performance.

The larger the value, the wider the surface area of the fiber. More preferably, the staple fibers 12,

Value may be 1.8 or more, and more preferably 1.8 to 3.0. The staple fibers 12 of the polymorphic cross-

If the value is more than 3.0, there is a problem that the manufacturing cost is increased as a result of the increase in the cost of detention manufacturing, the replacement of the related facilities for improving the cooling efficiency, the modification of the polymer for improving the solidification rate, and the lowering of the productivity.

값이 1.5 이상을 만족하는 본 발명 섬유집합체(10)에 포함되는 다형 단면 단섬유(staple fiber)(12)는 육각 별 모양, 3봉 편평형, 6엽형 또는 8엽형 등의 단독 또는 혼합 형태일 수 있다. 구체적으로, 도2는 본 발명의 바람직한 일구현예에 따른 육각 별모양의 다형 단면 단섬유(staple fiber)로,

값이 1.51이며, 도3은 본 발명의 바람직한 일구현예에 따른 3봉 편평형의 다형 단면 단섬유(staple fiber)로,

값은 1.60 이다. 또한, 도4는 본 발명의 바람직한 일구현예에 따른 6엽형의 다형 단면 단섬유(staple fiber)로

값은 1.93이며, 도5는 본 발명의 바람직한 일구현예에 따른 8엽형의 다형 단면 단섬유(staple fiber)로,

값은 2.50이다.
remind

The staple fibers 12 included in the fiber aggregate 10 of the present invention having a value of 1.5 or more can be used alone or in a mixed form such as a hexagonal star shape, a three-rod flat shape, a six- have. Specifically, FIG. 2 is a hexagonal star-shaped staple fiber according to a preferred embodiment of the present invention,

Value of 1.51, and Figure 3 is a three-pole flat-type polymorphic staple fiber according to a preferred embodiment of the present invention,

The value is 1.60. FIG. 4 is a graph showing the relationship between the length of the staple fiber and the length of the staple fibers of the present invention.

Value is 1.93, and Fig. 5 is an 8-leaf type polymorphic staple fiber according to a preferred embodiment of the present invention,

The value is 2.50.

값은 1.0으로 표면적이 충분히 넓지 않아 흡음률이 현저히 떨어지며(비교예2 참조), 육각 별 모양, 3봉 편평형, 6엽형 또는 8엽형 형태의 다형 단면 단섬유(staple fiber)일지라도

값이 1.5 이상을 만족하지 않는다면 소리에너지의 점성 손실을 발생시킬 수 있는 표면적이 충분치 않아 본 발명 멜트블로운 섬유집합체(10)에 사용되는 다형 단면 단섬유(staple fiber)로 적합하지 않다. (비교예3 내지 6 참조)
Of circular cross section staple fiber

The value is 1.0 and the surface area is not sufficiently wide, so that the sound absorption rate is remarkably low (see Comparative Example 2), and even if it is a polymorphic staple fiber of hexagonal star shape, 3-rod flat shape, 6-leaf type or 8-

If the value is not more than 1.5, there is not enough surface area to cause a viscous loss of sound energy, so it is not suitable as a polymorphic staple fiber used in the meltblown fiber aggregate 10 of the present invention. (See Comparative Examples 3 to 6)

More preferably, the polymorphic staple fiber 12 used in the present invention may have an L / W value of 2 to 3. L is the Length abbreviation value of the length of the fiber in the longitudinal direction, and W is the Abbreviation of Length Width in the transverse direction connecting the vertex and the vertex. Specifically, FIG. 6 shows L and W values of 8-leaf type polymorphic cross-section fibers. In the case of 8-leaf type polymorphic cross-section fiber cross-section, The distance from the vertex to the vertex can be expressed by W.

값이 1.5 이상을 만족하는 다형 단면 단섬유(staple fiber)(12)라면 바람직하다.
Further, the number of the vertexes may be more preferably 6 to 8 in the polymorphic staple fiber 12 used in the present invention. However, the number of L / W or the number of vertices is not particularly limited,

It is preferable that the staple fiber 12 satisfies a value of 1.5 or more.

The fiber length of the polymorphic staple fiber 12 may range from 22 to 64 mm. If the fiber length is less than 22 mm, the sound absorption performance may deteriorate due to the reduction of the thickness and compression recovery rate of the fiber structure, The fibers may be uniformly mixed in the fiber opening process and the carding process and the blowing process. When the fibers are mixed at the same ratio, they are adjusted in the unit of weight. Therefore, There may be a problem that the number of fibers is reduced and the physical properties such as the thickness reduction and the compression recovery rate are lowered. Furthermore, the fineness of the polymorphic staple fiber 12 may be 1 to 10 D, and the smaller the fineness, the more effective it is to improve the scratch performance. If the fineness of the polymorphic staple fiber (12) is less than 1 D, there may be a problem in controlling the optimum shape of the target cross-section. If it exceeds 10 De, So that the number of short fibers is reduced in the entire fiber structure, resulting in a decrease in thickness and a decrease in the physical properties such as compression recovery rate There may be a problem.

Polyethylene terephthalate (PET) may be preferably used as the material of the staple fibers 12 included in the fiber aggregate 10 of the present invention, but it is not particularly limited thereto , Polypropylene (PP), rayon, or the like, and may be preferably used as a polymer that can be used as a staple fiber.

The fiber aggregate 10 having excellent sound absorption performance of the present invention comprises 35 to 85% by weight of the meltblown fiber 11 and 15 to 65% by weight of the polymorphic section staple fiber 12 can do. If the polymorphic staple fiber 12 is less than 15 wt%, the advantages of incorporating staple fibers to increase the thickness and compression recovery rate may be reduced, resulting in a problem of reduced sound absorption performance, The ratio of the extremely fine fiber portions is reduced. Therefore, the energy loss rate of the sound waves entering the fiber aggregate of the same weight is increased, and the incidence of the viscous loss of the sound waves for reducing the noise is reduced. As a result, Can be.

The meltblown fibers 11 and the staple fibers 12, which are composed of ultrafine fibers, are present together at a ratio within the above-mentioned range, so that a large surface area and an air layer can be formed to improve the sound absorption rate, In particular, excellent sound absorption performance can be realized not only at high frequencies but also at low frequency bands. Further, it is possible to provide a fiber aggregate which can exhibit excellent sound absorbing performance by using a small amount of fibers, can be designed to be lightweight, and has an excellent compression recovery ratio.

The fibrous aggregate 10 composed of meltblown fiber 11 and staple fiber 12 dispersed therein is formed of the fibrous aggregate 10 The support layers 20 and 30 having a predetermined thickness are formed on one surface or both surfaces thereof.

For this purpose, examples of various well-known materials applied for the interior cover on the surface of the fiber aggregate 10 made of meltblown fiber 11 and polymetal staple fiber 12 Known materials such as a nonwoven fabric, a woven fabric, a knitted fabric, a foam, a film, a paper, a spunbond fabric, a meltblown fabric, a staple web or the like may be used alone or in combination of two or more. (20, 30) may be formed. The supporting layers 20 and 30 cover the surface of the sound absorbing material applied to the interior of the vehicle or the inside of the building to maintain the shape of the sound absorbing material and to provide strength, and at the same time, the staple fibers 12 of the sound absorbing material Is also prevented from being released, so that the sound-absorbing function can be continuously maintained.

 The fibrous aggregate having excellent sound absorption properties as described above comprises (1) a step of producing a staple fiber of polymorphic cross-section satisfying the following relational expression 1; And (2) mixing the staple fiber with the polymorphic cross-section in the course of spinning the meltblown fiber.

[Relation 1]

(A: 섬유 단면적(μm²), P: 섬유단면 둘레의 길이(μm))

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm))

In order to produce a fibrous aggregate having excellent sound absorption performance of the present invention, the above-mentioned polymorphic staple fibers 12 are incorporated into a nonwoven fabric undergoing meltblown formation by a high-pressure air stream and uniformly dispersed therein, As shown in Fig. Detailed descriptions of the meltblown fiber 11 and the polymorphic staple fiber 12, which are equally applicable to the method of manufacturing the sound absorbing material of the present invention, will be omitted below.

Since the meltdowned fiber aggregate 10 is formed by meltblowing as described above and the staple fiber 12 dispersed in the fiber aggregate 10 simultaneously progresses to form a sound absorbing material, The staple fibers 12 are not only uniformly dispersed but also have a characteristic that they are easy to manufacture and the manufacturing process is simple.

The sound absorbing capacity of the fiber aggregate having excellent sound absorption performance of the present invention, which has a thickness of 16 mm or less and a surface density of 350 g / m ² or less, may be 0.73 or more at 1000 Hz, 1.04 or more at 2000 Hz, have.

값이 1.5 이상을 만족하는 다형 단면 단섬유(staple fiber)를 혼입함에 따라 표면적 및 공기층의 형성을 극대화하여 2000Hz, 5000Hz의 고주파 대역뿐만 아니라 1000Hz의 저주파에서도 0.73 이상의 우수한 흡음률을 나타낼 수 있다. 또한, ASTM D6571에 의해 측정한 압축회복률이 43%이상으로, 운송, 보관, 부착 이후 등에 발생하는 외력에 의한 압축 및 형태 변형이 감소될 수 있다. 이에 따라, 본 발명의 흡음재는 외부 소음이 차량 실내로 유입되는 것을 차단하는 자동차용 흡음재 또는 기차, 선박, 항공기 등 전반에 걸쳐 사용될 수 있을 뿐만 아니라 모터 부품을 사용하는 전자제품 등에도 소음 차단 성능을 향상시키기 위해 다양하게 사용할 수 있다.
The fiber aggregate having excellent sound absorption performance of the present invention is obtained by

The staple fibers having a value of 1.5 or more are mixed to maximize the surface area and the formation of the air layer so that an excellent sound absorption ratio of 0.73 or more can be obtained not only in the high frequency band of 2000 Hz and 5000 Hz but also in the low frequency of 1000 Hz. In addition, the compression recovery rate measured by ASTM D6571 is 43% or more, and compression and deformation due to external force occurring after transportation, storage, or attachment can be reduced. Accordingly, the sound absorbing material of the present invention can be used not only for a sound absorbing material for automobiles or for a train, a ship, an airplane, etc., which blocks external noises from entering into a vehicle interior, but also for an electronic product using motor parts. It can be used variously to improve.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

The polyethylene terephthalate polymer having a melting point of 260 ° C and an intrinsic viscosity of 0.65 was irradiated at a spinning temperature of 275 ° C at a winding speed of 1,000 m / min and 3.3 times of stretching at 77 ° C, followed by final heat treatment at 140 ° C, 5, η = 2.5). The obtained polymorphic cross section yarn was made of short fibers having a fineness 7D, a strength of 5.7 g / D, an elongation of 40%, a crimp number of 14.5 / inch, and a fiber length of 64 mm.

The polymorphic cross-section staple fibers were uniformly and quantitatively mixed through a blowing apparatus after opening and carding processes, in which polypropylene melt blown fibers having an average diameter of 2.3 μm were radiated. At this time, the melt blown radiation temperature and the hot air temperature were set at 270 ° C. The multifilament short staple fibers were mixed with each other in a vertically descending meltblown air stream so that the multifilament short staple fibers were 40% by weight and the polypropylene melt blown staple was made to have a residual amount of 60% m < ² > and a thickness of 16 mm were produced and passed through a hot chamber at 130 [deg.] C atmosphere at a speed of 5 m / min to produce a short fiber composite meltblown fiber aggregate.

≪ Example 2 >

The procedure of Example 1 was repeated except that a fiber aggregate was prepared using polymorphic cross-section fibers having a hexagonal star shape (Fig. 2,? = 1.51).

≪ Example 3 >

The procedure of Example 1 was repeated except that a fibrous aggregate was produced using polymetal cross-section staple fibers of three-bar flat shape (Fig. 3,? = 1.60).

<Example 4>

(Fig. 4,? = 1.93) was used to prepare fibrous aggregates. The procedure of Example 1 was repeated to prepare fibrous aggregates.

&Lt; Comparative Example 1 &

The procedure of Example 1 was repeated to prepare a meltblown fiber aggregate composed of 100% polypropylene resin without mixing short fibers.

&Lt; Comparative Example 2 &

= 1.0)의 다형단면 단섬유를 사용하여 섬유집합체를 제조한 것을 제외하고는 실시예1과 동일하게 실시하여 제조하였다.
circle(

= 1.0) was used to prepare a fibrous aggregate. The procedure of Example 1 was repeated to prepare a fiber aggregate.

&Lt; Comparative Example 3 &

= 1.30)의 다형단면 단섬유를 사용하여 섬유집합체를 제조한 것을 제외하고는 실시예1과 동일하게 실시하여 제조하였다.
Star shape (

= 1.30) was used to prepare a fibrous aggregate. The procedure of Example 1 was repeated to prepare a fibrous aggregate.

Comparative Example 4

= 1.42)의 다형단면 단섬유를 사용하여 섬유집합체를 제조한 것을 제외하고는 실시예1과 동일하게 실시하여 제조하였다.
W type

= 1.42) was used to prepare a fibrous aggregate. The procedure of Example 1 was repeated to prepare a fibrous aggregate.

&Lt; Comparative Example 5 &

= 1.26)의 다형단면 단섬유를 사용하여 섬유집합체를 제조한 것을 제외하고는 실시예1과 동일하게 실시하여 제조하였다.
Y type

= 1.26) was used to prepare a fibrous aggregate. The procedure of Example 1 was repeated to prepare a fibrous aggregate.

&Lt; Comparative Example 6 >

= 1.41)의 다형단면 단섬유를 사용하여 섬유집합체를 제조한 것을 제외하고는 실시예1과 동일하게 실시하여 제조하였다.
Hexagon star shape (

= 1.41) was used to prepare a fiber aggregate. The procedure of Example 1 was repeated to prepare a fiber aggregate.

<Experimental Example>

In order to evaluate the sound absorption performance of the fibrous aggregates produced according to Examples 1 to 4 and Comparative Examples 1 to 6, the following tests were carried out, and the results are shown in Table 1.

1. Thickness

The average value was measured 20 times over the entire width using a thickness gauge.

2. Absorption rate

For the measurement of the sound absorption rate, three specimens were prepared for each test piece applicable to the ISO R 354, Alpha Cabin method. The absorption coefficient was measured and the average value of the measured absorption coefficient was shown in Table 3.

3. Compression recovery rate

Compression recovery rates were measured using the ASTM D6571 method under the following conditions. The compressive recovery rate (%) was calculated by calculating the thickness ratio after compression for a certain period of time using the thickness measured at a constant initial condition and the weight of 7.26 kg.

Sample size Plate size Experimental conditions (temperature and humidity) Experimental condition load 200 * 200 mm ² 230 * 230 * 6.35 mm ³ , 187 g 20 ~ 24 ℃, no humidity 7.26 kg

division Frequency (Hz) Absorption Rate Compression recovery rate 1000Hz 2000Hz 3150Hz 5000Hz Example 1 0.86 0.99 0.99 1.12 45 Example 2 0.73 0.94 0.97 1.06 43 Example 3 0.78 0.98 0.97 1.04 43 Example 4 0.84 0.96 0.98 1.12 45 Comparative Example 1 0.51 0.78 0.85 0.93 28 Comparative Example 2 0.64 0.85 0.92 0.97 42 Comparative Example 3 0.69 0.91 0.95 1.02 41 Comparative Example 4 0.71 0.93 0.96 1.03 40 Comparative Example 5 0.68 0.89 0.95 0.99 42 Comparative Example 6 0.70 0.92 0.96 1.03 42

값이 1.5 이상을 만족하는 실시예 1 내지 4가 비교예 1 내지 6에 비하여 흡음성능 및 압축회복률이 우수한 것으로 나타났다.As can be seen from Table 2 above,

It was found that Examples 1 to 4 having a value of 1.5 or more were superior in sound absorption performance and compression recovery rate as compared with Comparative Examples 1 to 6.

값이 1.5 이상을 만족하지 못하는 다형단면 단섬유를 포함한 비교예3 내지 6는 표면적이 충분히 넓지 않아 흡음률 면에서 효과가 떨어지며, 압축회복률 역시 떨어지는 것을 확인할 수 있다. 육각 별모양의 다형 단면 단섬유를 이용하였지만,

값이 1.5 미만인 비교예6 역시 실시예들에 비하여 현저히 낮은 흡음률을 나타냈다.Specifically, not only Comparative Example 2 including the circular cross-section staple fibers

Comparative Examples 3 to 6 including the polymodal cross-section short fibers having a value of not more than 1.5 did not have a sufficiently large surface area, so that the effect was poor in terms of the sound absorption rate and the compression recovery rate was also inferior. Although hexagonal star-shaped polymorphic cross-section fibers were used,

Comparative Example 6 having a value of less than 1.5 also exhibited a significantly lower sound absorption ratio than the Examples.

값이 1.5 이상을 만족하는 다형단면 단섬유를 혼입한 실시예 1 내지 4는 우수한 압축회복률을 나타내어 운송, 보관, 부착 이후 등에 발생하는 외력에 의한 압축 및 형태 변형이 감소될 수 있을 뿐만 아니라 표면적 및 공기층의 형성을 극대화하여 흡음 성능이 현저히 향상되었으며, 특히 1000Hz의 저주파 대역에서도 우수한 흡음률을 보이는 것을 확인할 수 있다.

Examples 1 to 4, in which the polymodal cross-section short fibers satisfying the value of 1.5 or more, exhibited excellent compression recovery rates, so that not only compression and shape deformation due to external forces occurring after transportation, storage, and attachment can be reduced, It was confirmed that the sound absorption performance was remarkably improved by maximizing the formation of the air layer and the excellent sound absorption ratio was exhibited even in the low frequency band of 1000 Hz.

The present invention relates to a fiber aggregate excellent in sound absorption performance and a method of manufacturing the fiber aggregate, and more particularly to a sound absorbing material for automobiles or a train, a vessel, an aircraft, etc., The present invention relates to a fiber aggregate excellent in sound absorption performance which can be used for improving noise shielding performance even in electronic products using motor parts.

Claims (12)

Characterized in that it comprises a meltblown fiber and a polymetallic staple fiber satisfying the following relational expression (1).
[Relation 1]

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm)) The method of claim 1,
Wherein the polymorphic staple fiber is at least one selected from the group consisting of a hexagonal star shape, a three-point flat shape, a six-leaf type shape, and an eight-leaf type shape. The method of claim 1,
Characterized in that the fiber length of the polymorphic section staple fiber is 22 to 64 mm. The method of claim 1,
And the fineness of the polymorphic end face staple fiber is 1 to 10 D. The method of claim 1,
Wherein the meltblown fiber has a diameter of 1.0 to 20.0 占 퐉. The method of claim 1,
Characterized in that the fibrous aggregate comprises 15 to 65 wt% of staple fibers of polymorphic cross-section. For fiber assemblies comprising meltblown fibers and polymetalline short staple fibers,
16mm or less thickness, area density 350g / m ² or less in a method Alpha Cabin Absorption Coefficient at least 0.73 at 1000Hz, 2000Hz at least 0.94, an aggregate having excellent sound-absorbing performance less than 1.03 at 5000Hz fiber measured by. 8. The method of claim 7,
Wherein the staple fiber of the polymorphic section satisfies the following relational expression (1).
[Relation 1]

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm)) 8. The method of claim 7,
Characterized in that the fibrous aggregate comprises 15 to 65 wt% of staple fibers of polymorphic cross-section. (1) producing a staple fiber of polymorphic section satisfying the following relational expression 1; And
(2) mixing the staple fiber of the polymorphic type in the course of the meltblown fiber being radiated.
[Relation 1]

(A: fiber cross-sectional area (μm ² ), P: length of fiber cross-section (μm)) 11. The method of claim 10,
Wherein the polymorphic staple fiber is at least one selected from the group consisting of a hexagonal star shape, a three-point flat shape, a six-leaf type shape, and an eight-leaf type shape. 11. The method of claim 10,
Wherein the fibrous aggregate comprises 15 to 65% by weight of staple fibers of polymorphic cross-section.

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