KR20160028062A - Fibrous Assemblies including Shaped cross-section hollow fiber - Google Patents

Abstract

The present invention provides a fibrous assembly including a shaped cross-sectional hollow fiber, wherein the fiber is composed of a hollow part, a shape maintaining part and a volume control part, the volume control part has a shape of protruding in a direction opposite to a fiber core and an end part is formed of a round shape to space adjacent fibers therein, thereby giving bulkiness and sound absorption property thereto and simultaneously reducing a diffraction phenomenon of sound energy.

Description

[0002] Fibrous Assemblies including Shaped Cross-section hollow fibers [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fibrous aggregate comprising heterogeneous hollow fibers, and more particularly to a fibrous aggregate comprising a heterogeneous hollow fiber having bulk control elements formed therein to improve bulkiness and sound absorption.

Generally, synthetic fibers used in fiber aggregates requiring functionalities such as heat insulation have a hollow cross-sectional structure and are manufactured by the following representative methods.

Fiber having a hollow cross-sectional structure using a single polymer is used. Due to the increase of dead air due to the hollow structure, the heat insulation is increased. In the cooling and orientation crystallization process, since the orientation difference in the cross section can be maximized in the hollow structure, the spontaneous crimp can be expressed and thereby a product having a volume feeling can be manufactured. This method is disadvantageous in that the productivity is lowered and the crimp expression is limited in order to maximize the cooling effect.

Another method is to use fibers of a hollow cross-sectional structure using two types of polymer shrinkage fibers. Generally, the void ratio is smaller than that of a single polymer, but the polymer has excellent shrinkability due to the shrinkage difference of the two polymers, thereby maintaining volume and elasticity. This method also has a disadvantage in that it can be used not only in the improvement of the hollow rate but also in the complex spinning because the product having a low viscosity is used for the crimp expression due to the shrinkage difference.

Among these techniques, Korean Patent No. 1387465 discloses a multi-split spinning nozzle having a modified cross section in which at least three or more hollows are formed on the inside of the hollow fiber, and the outer side of the fiber is divided into the same number as the number of divided hollows on the inner side, And the hollow section of the modified section obtained through the multi-division spinning nozzle of the modified section can not be easily crushed or deformed by the external force even at a high hollow ratio, The fiber is able to utilize lightweight, heat-insulating and quick-drying quick-drying properties of the multi-split hollow fiber of the cross section by maximizing the quick drying property by adding surface irregularities to the cross-sectional shape and the cross- .

As a result of a number of tests by the present inventors, although the above technology can form a multi-split hollow fiber, the protruding shape of the outer slit 22, as shown in FIG. 9, It is possible to inhibit the movement of fibers in the aggregate due to the interference of the outer slits, resulting in nonuniformity in the uniformity. Rather, it induces the interfiber adhesion and inhibits formation of spaces between the fibers in the aggregate, thereby inhibiting the bulkiness and warmth As an element.

Also, in order to improve the warmth, glue property and the like of the fiber aggregate, Korean Patent Laid-Open Publication No. 2011-0069474 discloses a method for producing a fiber aggregate, comprising the steps of: 60 to 98% by weight of ultrafine fibers having a diameter of 4 to 15 탆 made of fibers, 15 to 40 탆 of hollow fibers, modified cross-section fibers, sheath / core type fibers, conjugate fibers, 1 to 30% by weight of low-melting-point fibers, 1 to 30% by weight of low-melting-point fibers, and 1 to 12% by weight of low-melting-point fibers, wherein the low melting point fibers are melted by heating to form microfine fibers, hollow fibers, A high heat insulating nonwoven fabric is disclosed, which is produced by combining a conjugate material fiber or a mixed fiber thereof with a sintering technique.

The above-mentioned technology has a common element technology for pursuing light weight and warmth by using some hollow fibers and aiming at morphological stability by fusion of low melting point fibers. However, since the content of microfine fibers is too high, Can not be secured.

Therefore, a multi-functional fiber aggregate having a fiber-reinforced structure having a hollow shape and a sound-absorbing function has been earnestly demanded for securing dead air while maintaining a space between fibers in a fiber aggregate and forming a spontaneous crimp.

In order to solve the above-mentioned problems, it is an object of the present invention to provide a fiber aggregate capable of securing an element for controlling volume in a fiber aggregate while securing morphology of a hollow portion stably, .

It is another object of the present invention to provide a fiber aggregate capable of variously controlling the volume control elements contained in the fiber aggregate.

Another object of the present invention is to provide a fibrous aggregate having excellent elasticity when the bulkiness and sound absorption properties are secured.

Another object of the present invention is to provide a fiber aggregate which can consume sound energy.

In order to achieve the above object, the present invention provides a fibrous aggregate, wherein the fibrous aggregate includes hollow fibers having a modified cross-section, the fibers comprising a hollow portion, a shape retaining portion, and a volume control portion, And the distal end portion is formed in a round shape so as to be spaced apart from adjacent fibers in the aggregate so as to impart bulkiness and sound absorption of the aggregate and at the same time to reduce the diffraction phenomenon of sound energy Lt; / RTI >

Further, the present invention provides a fibrous aggregate satisfying the following conditions when the uppermost portion of the volume control end portion of the above-mentioned modified hollow fiber is defined as a peak and the space between the volume control portions is defined as a valley.

 (1) -3? Z? 4

≤ 1.8(2) 0.9?

1.8

here,

R: radius of curvature of peak

r: radius of curvature of the valley

The present invention also provides a fibrous aggregate wherein the modified monocomponent hollow fiber satisfies the following conditions.

≥ 0.80(3)

≥ 0.80

≥ 0.30(4)

≥ 0.30

here,

T1: the distance from the center point M to the peak 310 is the largest value

T2: the distance from the center point M to the peak 310 is the smallest value

t1: the distance from the center point M to the valley 330 is the largest value

t2: the distance from the center point M to the valley 330 is the smallest value

CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,

CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1

Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax

CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M

Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax

Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin

The present invention also provides a fibrous aggregate produced through a spinneret whose shape is radially expanded to form a volume control of the modified hollow fiber.

Further, the present invention provides a fibrous aggregate wherein the radially-developed angle is at an angle (?) Of 10 to 17 degrees with respect to a center point (M).

In addition, the present invention provides a fibrous aggregate in which 4 to 12 volume control portions of the modified cross-section hollow fibers are formed.

The present invention also provides a fibrous aggregate in which the hollow fibers of the modified cross-section hollow fibers have a hollow ratio of 15 to 30%.

When the fibrous aggregate is produced by a heat bonding process, the fibrous aggregate comprises 60 to 90% by weight of the modified cross-section hollow fibers and 40 to 10% by weight of the binding material, and the length of the modified cross- 64 mm and a fiber thickness of 6 to 8 denier.

When the fibrous aggregate is produced by a melt blowing process, the fibrous aggregate comprises 20 to 60% by weight of the modified hollow fiber and 80 to 40% by weight of the three-fiber PP fiber, and the length of the modified hollow fiber is 32 to 51 mm and the fiber thickness is 6 to 8 denier.

The fibrous aggregate comprising the modified hollow fiber according to an embodiment of the present invention is advantageous in that the fibrous aggregate is secured in the fibrous aggregate due to the interference effect of the volume control portion. Accordingly, it is possible to secure more dead air, There is an advantage that can be shown.

Further, the fibrous aggregate comprising the modified hollow fiber according to the present invention is characterized by high bulkiness, excellent sound absorption due to internal sound absorption and soundproof factor, and the like.

In addition, the fibrous aggregate comprising the modified hollow fiber according to the present invention has an advantage of being excellent in light weight and heat retention as well as bulky property and elasticity.

1 to 6 are schematic views of a fiber cross section according to a preferred embodiment of the present invention.
7 is a conceptual view of spinning and detaching corresponding to a volume control unit according to a preferred embodiment of the present invention.
8 is a schematic cross-sectional view of a fiber assembly according to a preferred embodiment of the present invention.
9 is a conceptual view of spinning and detaching according to the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms "substantially", "substantially", and the like are used herein to refer to a value in or near the numerical value when presenting manufacturing and material tolerances inherent in the meanings mentioned, Absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure.

As used herein, the term fibrous aggregate refers to a group including at least one kind of fibers such as a fabric, a knitted fabric, a fabric, a nonwoven fabric, a web, a sliver, a tow, and the like.

The modified hollow fiber according to a preferred embodiment of the present invention may be made of any material that can be formed into a fibrous shape. Preferably, polyethylene terephthalate (PET) may be used, but not limited thereto, polypropylene (PP), nylon and the like may be used. The melt viscosity of the PET polymer to be melt-spun is preferably from 0.60 to 0.64, and an in-out type radiation cylinder capable of maximizing the cooling effect is suitable. The thickness of the fibers can be varied from 4 to 15 De and the fiber length can be from 22 to 64 mm.

FIG. 1 is a conceptual view of a modified hollow fiber according to a preferred embodiment of the present invention. The fiber 10 may be formed of a hollow part 100, a shape retaining part 200, and a volume control part 300. It is preferable that the hollow portion 100 has a hollow ratio of about 15 to 30% in the total area of the fibers. Above the above range, there may be a problem in fiber formability, and if it is less than the above range, the hollow retention property and the various functionalities of the present invention may be limited. The shape retaining part 200 refers to a fibrous shape between the hollow part 100 and the volume control part 300.

The volume control part 300 may protrude in a direction opposite to the center of the fiber, and the distal end may be round. At this time, the uppermost part of the distal end can be defined as the peak 310, and the space between the volume control parts can be defined as the valley 330. At this time, the radius of curvature of the peak can be defined as R, the radius of curvature of the valley as r, and R and r values that are different from each other can be determined for each volume control (FIG. 2).

A value T1 is the largest distance from the center point M of the hollow portion 100 to the peak 310 and T2 the smallest distance from the center point M to the peak 310 is the center point M And the distance from the center point M to the valley 330 is defined as t2. On the other hand, a circle formed by connecting the tangent of the volume controller 300 having the next higher order distance from the center point M to the peak 310 on the basis of T1 is referred to as CTmax and T2 is defined as a peak from the center point M A circle formed by connecting the tangent of the volume controller 300 having a smaller distance from the center point M to the peak 310 is referred to as a CTmin and a distance from the center point M to the peak 310 on the basis of t1 is larger And a tangent line of the volume control unit 300 having a smaller distance from the center point M to the peak 310 is connected to the tangent line of the volume control unit 300 When the formed circle is Ctmin; The difference value between the center point CTmaxM of the CTmax and the center point M is denoted by CTmax-R and the difference between the center point CTminM of the CTmin and the center point M is denoted by CTmin-R and the center point CtmaxM of the Ctmax, When the difference value between the center point (CtminM) and the center point (M) of the Ctmin is defined as Ctmin-r, the fiber according to the present invention can satisfy the following conditions. 3 to 6)

When the deviation between the curvature radius R of the peak and the curvature radius r of the valley is defined as Z, the above Z may be defined by the following conditions (1) and (2).

(1) -3? Z? 4

≤ 1.8(2) 0.9?

1.8

here,

R: radius of curvature of peak

r: radius of curvature of the valley

Many tests by the present inventors through fiber cross-sectional morphology analysis showed that the volume control portion of one fiber was inserted into the valley between the volume control portions of the adjacent fibers in the outside of the above range to show a structural characteristic as if the gears were engaged, And it is analyzed that it has a bad influence on the uniformity of the fiber aggregate. The volume control part between the fibers interferes with each other within the above range, and the bulky property is maintained. Even if the volume control part is inserted into the valley of the adjacent fiber, the fiber control part can be easily detached by flow or the like, thereby improving uniformity in the fiber aggregate.

The fibers according to the preferred embodiment of the present invention may satisfy the following conditions: CTmax-R, CTmin-R, Ctmax-r, and Ctmin-r.

≥ 0.80(3)

≥ 0.80

≥ 0.30
(4)

≥ 0.30

here,

T1: the distance from the center point M to the peak 310 is the largest value

T2: the distance from the center point M to the peak 310 is the smallest value

t1: the distance from the center point M to the valley 330 is the largest value

t2: the distance from the center point M to the valley 330 is the smallest value

CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,

CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1

Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax

CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M

Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax

Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin

The above conditions (3) and (4) may relate to the formation of fibers according to an embodiment of the present invention. Ideally, the value should be 1, but not 1 due to the rheological properties of the polymer. The condition (3) may be related to formation of the volume control portion. Outside of the above range, the deviation of the volume control portion may be large and the variation of the r value may be large, which may affect the carding property in the process or the bulkiness in the fiber aggregate. Condition (4) can be interpreted as fiber morphology, which can affect the formability of hollow portion 100 and shape retaining portion 200. Outside of the above range, hollow formation and fiber shape retention may be unstable.

In order to form the fiber cross-section as described above, the spinneret of the volume controller 300 may be formed in a radial shape as shown in FIG. At this time, an angle (?) Of 10 to 17 degrees with respect to the center point M may be formed. As a result of a number of tests by the present inventors, a fiber cross-sectional shape has been realized which can satisfy the above requirements for manifesting the function of the member 300 as a volume control element of the modified cross section while maintaining the hollowness within the above range.

 The cross-sectional shape of the modified hollow fiber used in the present invention may be 4 to 12 volume control parts on the fiber surface.

The fibers according to an embodiment of the present invention may be made of polyester which is a thermoplastic resin as a non-limiting example. The fibers may be spun in a short fiber state or in a nonwoven form through spontaneous crimp development due to a difference in crystallization speed during cooling and solidification, It can contribute to improving elasticity.

The fiber according to the present invention can be produced by forming a fibrous assembly including a binding material for forming a binding structure between fibers or only the fibers according to the present invention into a nonwoven fabric through a needle punching process, a heat bonding process, or a meltblowing process have.

The fibrous aggregate to which the modified hollow fiber according to the present invention is applied may be a binding material generally used for binding between fibers. In the short fiber form, a low melting point PET staple fiber having a cis-core type may be used in the heat bonding process. In the blowing process, PP fibers of three islands can be used.

 The material to be produced in the heat bonding step is composed of 60 to 90% by weight of the cross-section hollow fiber and 40 to 10% by weight of the binding material, wherein the length of the cross-section hollow fiber is 51 to 64 mm , And the thickness (fineness) of the fibers may be 6 to 8 denier. When the length of the hollow fiber cross-section is less than 51 mm in the heat bonding step, the gap between the fibers is widened, making it difficult to form a matrix structure, and formation and production into a fibrous aggregate becomes difficult. Also, due to excessive porosity, sound absorption and sound insulation performance may be deteriorated.

The compositional weight ratio of the modified cross-section hollow fiber to the binding material is preferably from 6: 4 to 9: 1. If the content of the hollow fiber of the cross-section is less than 60% by weight, the surface area of the fiber is reduced and the physical properties can not be realized. In particular, since the content of the low melting point PET used in the heat bonding process is relatively high, The fibrous aggregate is hardened because it can not maintain the key property. On the other hand, if the content of the hollow fibers of the cross-section exceeds 90% by weight, the content of the binder fibers, that is, the binding material becomes less than 10%, so that the sufficient binding force between the fibers can not be maintained. It becomes difficult to do.

The material to be produced in the melt blowing step is composed of 20 to 60% by weight of the modified hollow fiber and 80 to 40% by weight of the three-fiber PP fiber, wherein the length of the modified hollow fiber is 32 to 51 mm And the thickness (fineness) of the fibers may be 6 to 8 denier. If it exceeds 51 mm, uneven web is formed due to entanglement between fibers in the blowing process due to post-sagging air. Therefore, it is necessary to select a suitable fiber sheet in the range of 32 ~ 64 ㎜ fiber length according to the post - process applied to sound - absorbing materials and fillers.

In the meantime, the function of the present invention is also expressed as a sound absorbing material, and the term " sound absorption " means that an object absorbs sound. As a sound absorbing material, a lot of fiber materials are used. Part of the energy of sound incident on the fiber material is reflected on the surface, a portion is transmitted, and the rest is absorbed in the material. Sound absorption inside the material is caused by resonance in the case of a porous material such as friction, viscous resistance or fibrillation in the inside thereof, membrane vibration in the case of a thin plate or cloth, or a narrow jar. .

Sound absorption is a phenomenon in which sound is projected on one side of a material, and when it is observed only from that side, the sound that is not reflected is absorbed and permeated by the material, which is apparently absorbed by the material. Is the sound absorption rate. The sound absorption rate depends on the frequency of the sound, the incident angle, the thickness of the material, the installation method, and the situation on the back side. Sound absorption materials with various sound absorption ratios are used to improve the sound effect in the room or to lower the noise level.

Also, sound is energy, and sound is transmitted by diffraction phenomenon. Because of this characteristic, the sound can be propagated to the outside even in the space where the sound absorbing material is installed.

Accordingly, the fiber according to the present invention is intended to further provide a function capable of suppressing not only sound absorption but also sound transmission due to diffraction phenomenon.

As described above, the volume control unit of the fiber according to the present invention secures bulkiness by physical interference in the fiber aggregate as described above, and further secures a space therebetween, so that sound absorption can be improved through vibration of the fiber, securing of a relative thickness,

In addition, since the volume control portion is enlarged in specific surface area as compared with the circular cross section, the energy of sound propagated through the diffraction phenomenon moves along the volume control portion according to the present invention is consumed and the sound energy is reduced. As a result, the fiber and fiber aggregate according to the present invention can further attain soundproofing and sound insulation effects.

Hereinafter, this embodiment will be described.

Examples 1 to 3

Using polyesters having an intrinsic viscosity of 0.64, 4, 6, and 12 fibers with volume control members were produced. After spinning at a spinning temperature of 285 DEG C at a spinning speed of 1,000 m / min, the fiber was stretched at a stretching ratio of 3.8 and crimped through a crimper to produce a fiber having a monofilament fineness of 5.2 De and a 125/24 De / fil. Each of these fibers was used as a lightly knitted fabric.

Example 4

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. After spinning at a spinning temperature of 285 캜 at a spinning speed of 1,000 m / min, the fiber was stretched at a draw ratio of 3.8, crimped through a crimper, and a fiber having a fiber length of 6 Da and a fiber length of 64 mm was produced. The fibers were opened and fabricated in the web state.

Example 5

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. After spinning at a spinning temperature of 285 캜 at a spinning speed of 1,000 m / min, the fiber was stretched at a draw ratio of 3.8, crimped through a crimper, and a fiber having a fiber length of 6 Da and a fiber length of 64 mm was produced. Using this fiber, a polyester low melting point yarn was mixed in an amount of 25% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric was 840 * 840 (mm * mm) and weighed about 330 g.

Example 6

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. After spinning at a spinning temperature of 285 캜 at a spinning speed of 1,000 m / min, the fiber was stretched at a draw ratio of 3.8, crimped through a crimper, and a fiber having a fiber length of 6 Da and a fiber length of 64 mm was produced. Using this fiber, a polyester low melting point yarn was mixed in an amount of 25% by weight, and a nonwoven fabric was produced by needle punching. This nonwoven fabric was 840 * 840 (mm * mm) and weighed about 380 g.

Example 7

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. After spinning at a spinning temperature of 285 캜 at a spinning speed of 1,000 m / min, the fiber was stretched at a draw ratio of 3.8, crimped through a crimper, and a fiber having a fiber length of 6 Da and a fiber length of 64 mm was produced. Using this fiber, a polyester low melting point yarn was mixed in an amount of 25% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric was 840 * 840 (mm * mm) and the weight was about 440 g.

Example 8

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. After spinning at a spinning temperature of 285 캜 at a spinning speed of 1,000 m / min, the fiber was stretched at a draw ratio of 3.8, crimped through a crimper, and a fiber having a fiber length of 6 Da and a fiber length of 64 mm was produced. The nonwoven fabric was prepared by mixing the fibers with 55 wt% of polypropylene melt blown yarn. This nonwoven fabric was 840 * 840 (mm * mm), weighing about 240 g and having a thickness of about 20 mm.

Comparative Examples 1 to 4

형 이형단면 섬유를 제조하였다. 이 때 단섬유 섬도 2.5De이고, 125/24De/fil.인 섬유를 제조한 후 이 각각의 섬유를 이용하여 경편물로 제조하였다.
The same procedure as in Example 1 was carried out except that a circular cross-section fiber, a circular hollow fiber, a circular hollow cross-section fiber having a polyester intrinsic viscosity of 0.64 and 0.50,

Shaped cross section fibers. At this time, the fibers having a single fiber fineness of 2.5De and 125 / 24De / fil. Were prepared, and then each of the fibers was used as a lightly knitted fabric.

Comparative Examples 5 to 7

Circular hollow fiber having a circular cross section fiber, a circular hollow fiber and a polyester intrinsic viscosity of 0.64 and 0.50 were produced in the same manner as in Example 4. In this case, fibers having a fiber size of 6 Da and a fiber length of about 60 mm were produced, and then opened with each of the fibers, and then manufactured into a web state.

Comparative Examples 8 and 9

형 이형8엽단면 섬유를 제조하였다. 이 때 단섬유 섬도 6De이고, 섬유장 64mm인 섬유를 제조하였다. 이 섬유를 이용하되, 폴리에스테르계 저융점사를 25중량%가 되도록 혼합하여 니들펀칭으로 부직포를 제조하였다. 이 부직포는 840*840(mm*mm)이고 중량은 약 330g이 되도록 하였다.
Same as Example 5, except that the circular cross-section fiber,

Shaped cross - section fibers. At this time, fibers having a fiber length of 6 Da and a fiber length of 64 mm were produced. Using this fiber, a polyester low melting point yarn was mixed in an amount of 25% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric was 840 * 840 (mm * mm) and weighed about 330 g.

Comparative Examples 10 and 11

형 이형8엽단면 섬유를 제조하였다. 이 때 단섬유 섬도 6De이고, 섬유장 64mm인 섬유를 제조하였다. 이 섬유를 이용하되, 폴리에스테르계 저융점사를 25중량%가 되도록 혼합하여 니들펀칭으로 부직포를 제조하였다. 이 부직포는 840*840(mm*mm)이고 중량은 약 380g이 되도록 하였다.
Same as Example 6, except that the circular cross-section fiber,

Shaped cross - section fibers. At this time, fibers having a fiber length of 6 Da and a fiber length of 64 mm were produced. Using this fiber, a polyester low melting point yarn was mixed in an amount of 25% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric was 840 * 840 (mm * mm) and weighed about 380 g.

Comparative Examples 12 and 13

형 이형8엽단면 섬유를 제조하였다. 이 때 단섬유 섬도 6De이고, 섬유장 64mm인 섬유를 제조하였다. 이 섬유를 이용하되, 폴리에스테르계 저융점사를 25중량%가 되도록 혼합하여 니들펀칭으로 부직포를 제조하였다. 이 부직포는 840*840(mm*mm)이고 중량은 약 440g이 되도록 하였다.
Same as Example 7, except that the circular cross-section fiber,

Shaped cross - section fibers. At this time, fibers having a fiber length of 6 Da and a fiber length of 64 mm were produced. Using this fiber, a polyester low melting point yarn was mixed in an amount of 25% by weight, and a nonwoven fabric was produced by needle punching. This nonwoven fabric was 840 * 840 (mm * mm) and weighed to about 440 g.

Comparative Example 14

The hollow section fibers were stretched at a spinning temperature of 285 DEG C at a spinning speed of 1,000 m / min using a polyester having an intrinsic viscosity of 0.64, stretched at a stretching ratio of 3.8, crimped through a crimper to obtain a monofilament fineness of 6De, Fibers having a length of 64 mm were produced. The nonwoven fabric was prepared by mixing the fibers with 55 wt% of polypropylene melt blown yarn. This nonwoven fabric was 840 * 840 (mm * mm), weighing about 240 g and having a thickness of about 20 mm.

In the following Examples and Comparative Examples, physical properties were measured as follows.

* Bulkability of composite fibers

end. Test Methods

  - Quantify 20 and 2 g of the prepared sample.

  - The sample is opened for one minute using the carding mechanism.

  - Insert the opened sample into a measuring beaker and let it go down 2 times (4cm) until it is uniformly filled.

  - Set the electronic balance to 0 "after placing the pressure plate on top of the container.

  - Record the weight of the balance while descending in 1 cm increments from the first 10 cm to the 4 cm point.

   - Go back to 10Cm and record the weight.

     (Graduation speed 2 sec / cm)

 I. Bulkite

  - Initial bulky: Bulk properties of fibers, value at 10 cm compression

  - Compression bullet: the rebound characteristics of the fiber, (compression 10 ~ 5cm value + 4cm value) / 2

  - Recovery Bulk: elastic recovery properties of fiber (recovery 10 ~ 5cm value + 4cm value) / 2

* Hollowness

The hollow ratio of the fibers was calculated as the ratio of the area occupied by the hollow to the total area of the fibers. The hollow fiber with the volume control was measured as the ratio of the area occupied by the hollow relative to the area of the contact with the pinion.

* Sound characteristics

end. Sound absorption rate measurement by reverberation method

It was measured using equipment conforming to ISO 354 (KS F 2805: Sound absorption rate measurement method in reverberation room). The size of the test specimen is 1.0mx 1.2m, and the reverberation time is 20dB when compared to the initial eeppressure, and the 1/3 Octave band sound source is used as the sound source. The absorption range was measured in the frequency range from 0.4 to 10 kHz.

Example  Comparative Example One 2 3 One 2 3
Sectional shape 4
The volume controller
Hollow 6
The volume controller
Hollow 12
The volume controller
Hollow
circle
Circular hollow
Circular hollow Hollowness (%) 19 21 18 - 22 6
Bulky Early 310 390 380 20 47 280 compression 11050 11900 11000 6500 8800 9000 recovery 4600 4900 4800 2500 3400 3900

As shown in Table 1, the fibers according to the present invention were tested to have excellent glue properties due to the interference effect of the volume control. In the fiber aggregate, the fibers according to the present invention had a volume control It is shown that the space is secured while interfering with the control part, and the flying property is improved.

division Example 1
(Hz) Example 2
(Hz) Example 4
(Hz) Comparative Example 1
(Hz) Comparative Example 2
(Hz) Comparative Example 3
(Hz) 0.4k 0.1390 0.1120 0.1230 0.0721 0.1170 0.0734 0.5k 0.0685 0.0633 0.0656 0.0656 0.0889 0.0622 0.63k 0.0598 0.0594 0.0596 0.0347 0.0683 0.0231 0.8k 0.1070 0.1050 0.1055 0.0617 0.1080 0.0634 1k 0.1320 0.1300 0.1313 0.0800 0.1370 0.0747 1.25k 0.1970 0.1960 0.1961 0.1050 0.1940 0.1030 1.6k 0.1960 0.2010 0.1980 0.1340 0.2080 0.1260 2k 0.1750 0.1690 0.1720 0.1100 0.1870 0.1050 2.5k 0.1560 0.1450 0.1510 0.0987 0.1520 0.0954 3.15k 0.1860 0.1710 0.1810 0.1000 0.1950 0.0958 4k 0.1630 0.1490 0.1610 0.0782 0.2000 0.0935 5k 0.1160 0.0931 0.1060 0.0832 0.1450 0.0855 6.3k 0.0529 0.0547 0.0528 0.0454 0.0934 0.0128 8k 0.1560 0.0853 0.1460 0.1170 0.2220 0.0488 10k 0.0872 0.1440 0.1170 0.0637 0.2010 0.0034

division Example 4
(Hz) Comparative Example 5
(Hz) Comparative Example 6
(Hz) Comparative Example 7
(Hz) 0.4k 0.22 0.20 0.20 0.20 0.5k 0.41 0.37 0.36 0.35 0.63k 0.47 0.43 0.40 0.39 0.8k 0.51 0.47 0.45 0.42 1k 0.59 0.55 0.54 0.50 1.25k 0.64 0.60 0.59 0.54 1.6k 0.64 0.61 0.62 0.55 2k 0.64 0.61 0.60 0.56 2.5k 0.65 0.61 0.58 0.55 3.15k 0.61 0.57 0.54 0.52 4k 0.57 0.53 0.52 0.50 5k 0.59 0.52 0.52 0.51

division Example 5
(Hz) Comparative Example 8
(Hz) Comparative Example 9
(Hz) 0.4k 0.18 0.18 0.15 0.5k 0.23 0.23 0.20 0.63k 0.22 0.22 0.20 0.8k 0.24 0.23 0.21 1k 0.23 0.22 0.20 1.25k 0.22 0.21 0.20 1.6k 0.27 0.25 0.25 2k 0.34 0.31 0.30 2.5k 0.40 0.36 0.36 3.15k 0.40 0.37 0.36 4k 0.39 0.38 0.36 5k 0.46 0.46 0.43 6.3k 0.53 0.52 0.50 8k 0.57 0.55 0.55 10k 0.62 0.62 0.66

Example 6
(Hz) Comparative Example 10
(Hz) Comparative Example 11
(Hz) 0.4k 0.16 0.18 0.15 0.5k 0.21 0.23 0.21 0.63k 0.22 0.22 0.21 0.8k 0.24 0.21 0.21 1k 0.24 0.20 0.20 1.25k 0.23 0.19 0.19 1.6k 0.29 0.24 0.24 2k 0.36 0.31 0.30 2.5k 0.43 0.37 0.37 3.15k 0.42 0.37 0.37 4k 0.41 0.36 0.36 5k 0.47 0.43 0.44 6.3k 0.54 0.50 0.51 8k 0.59 0.56 0.53 10k 0.71 0.61 0.52

Example 7
(Hz) Comparative Example 12
(Hz) Comparative Example 13
(Hz) 0.4k 0.11 0.15 0.18 0.5k 0.21 0.20 0.22 0.63k 0.23 0.21 0.21 0.8k 0.25 0.22 0.22 1k 0.25 0.22 0.20 1.25k 0.24 0.21 0.19 1.6k 0.30 0.26 0.24 2k 0.38 0.33 0.32 2.5k 0.45 0.39 0.40 3.15k 0.45 0.39 0.39 4k 0.44 0.37 0.37 5k 0.52 0.43 0.45 6.3k 0.62 0.51 0.53 8k 0.66 0.55 0.58 10k 0.69 0.60 0.65

Example 8
(Hz) Comparative Example 14
(Hz) 0.4k 0.25 0.20 0.5k 0.46 0.38 0.63k 0.58 0.46 0.8k 0.72 0.58 1k 0.94 0.77 1.25k 1.12 0.93 1.6k 1.14 0.99 2k 1.03 0.96 2.5k 1.02 0.99 3.15k 0.98 0.96 4k 0.89 0.87 5k 0.92 0.86 6.3k 0.93 0.84 8k 0.94 0.80 10k 0.95 0.74

Tables 2 to 8 show the results of the comparison of the fibrous aggregates according to the present invention with those of the comparative examples, and the fibrous aggregates according to the present invention generally exhibit excellent sound absorbing properties.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (9)

In the fibrous aggregate,
Wherein the fibrous aggregate comprises a modified cross-section hollow fiber,
Wherein the fiber comprises a hollow portion, a shape retaining portion, and a volume control portion,
The volume control portion may be protruded in a direction opposite to the center of the fiber, and the end portion may be formed in a round shape so as to be spaced apart from adjacent fibers in the aggregate, thereby imparting bulkiness and sound absorption of the aggregate and reducing diffraction phenomenon of sound energy. Wherein the fiber bundle comprises a cross-section fiber. The method according to claim 1,
Wherein the uppermost portion of the volume control end portion of the modified hollow fiber is defined as a peak and the space between the volume control portions is defined as a valley.
(1) -3? Z? 4
(2) 0.9?

1.8
here,
R: radius of curvature of peak
r: radius of curvature of the valley The method according to claim 1,
Wherein the modified cross-section hollow fiber satisfies the following conditions.
(3)

≥ 0.80
(4)

≥ 0.30

here,
T1: the distance from the center point M to the peak 310 is the largest value
T2: the distance from the center point M to the peak 310 is the smallest value
t1: the distance from the center point M to the valley 330 is the largest value
t2: the distance from the center point M to the valley 330 is the smallest value
CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,
CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,
Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1
Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,
CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax
CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M
Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax
Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin The method according to claim 1,
Wherein the fibrous aggregate is produced through a spinneret whose shape is radially expanded to form a volume control portion of the modified hollow fiber. 5. The method of claim 4,
Wherein the radially developed angle is an angle (?) Of 10 to 17 degrees with respect to a center point (M). The method according to claim 1,
Wherein the volume control portion of the modified hollow fiber has 4 to 12 fibers. The method according to claim 1,
And the hollow fibers of the modified cross-section hollow fibers have a hollow ratio of 15 to 30%. The method according to claim 1,
When the fibrous assembly is produced by a heat bonding process,
Wherein the fibrous aggregate comprises 60 to 90% by weight of the cross-section hollow fiber and 40 to 10% by weight of the binding material, wherein the cross-section hollow fiber has a length of 51 to 64 mm and a fiber thickness of 6 to 8 denier. The method according to claim 1,
When the fibrous aggregate is produced by a melt blowing process
Wherein the fibrous aggregate comprises 20 to 60% by weight of the hollow fiber of the modified cross-section and 80 to 40% by weight of the PP fiber of the hemp cloth, the length of the modified hollow fiber is 32 to 51 mm and the fiber thickness is 6 to 8 denier .

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