KR101641898B1 - Shaped cross-section hollow fiber and fibrous Assemblies using thereof - Google Patents

Abstract

The present invention is characterized in that in the hollow fiber of the modified cross section, the fiber comprises a hollow portion, a shape retaining portion and a volume control portion, the volume control portion may protrude in a direction opposite to the center of the fiber, Thereby providing a hollow fiber having a cross section.

Description

Technical Field [0001] The present invention relates to a hollow fiber and a fibrous aggregate using the hollow fiber,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hollow fiber having a uniform cross section and a fiber aggregate using the hollow fiber.

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.

Accordingly, a composite functional fiber and a fiber aggregate capable of securing the shape retentivity of the hollow portion and securing the dead air and maintaining space between fibers in the fiber aggregate and forming a spontaneous crimp and securing the elasticity and cushionability have been earnestly demanded .

In order to solve the above problems, it is an object of the present invention to provide a fiber capable of manifesting various functions by securing a space between fibers by securing an element for controlling volume in the fiber aggregate while securing the morphology of the hollow portion stably. .

It is another object of the present invention to provide fibers formed by variously controlling volume control elements.

Another object of the present invention is to provide a fiber capable of manifesting various functions through spontaneous crimp expression.

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

In order to accomplish the above object, the present invention provides a hollow fiber having a hollow section, a shape retaining section, and a volume control section, wherein the volume control section protrudes in a direction opposite to the center of the fiber , And the distal end portion is formed in a round shape, and the uppermost portion of the end portion of the volume control portion is defined as a peak, and the space between the volume control portions is defined as a valley.

delete

 (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 modified hollow fiber having the following properties.

≥ 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 shaped cross-section hollow fiber produced through a radially deployed spinneret to form the volume control.

The present invention also provides a modified cross-section hollow fiber in which the radially-developed angle is at an angle (?) Of 10 to 17 degrees with respect to a center point (M).

Also, the present invention provides a modified hollow fiber having 4 to 12 volume control portions.

In addition, the present invention provides a modified cross-section hollow fiber in which the hollow portion is formed at 15 to 30% in cross-sectional area of the fiber.

The present invention also relates to a method for producing hollow fibers having a volume control of 4, 6, or 12 using a polyester having an intrinsic viscosity of 0.64, stretching the yarn at a spinning temperature of 285 DEG C at a spinning speed of 1,000 m / Crimped through a crimper to provide a cross-section hollow fiber having a monofilament fineness of 7 De and a fiber length of 64 mm.

The present invention also provides a fibrous aggregate comprising the fibers.

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 modified hollow fiber according to an embodiment of the present invention can provide a fiber having a relatively high hollow ratio and a stable shape.

In addition, the present invention has an advantage of securing the bulky property in the fiber aggregate due to the interference effect of the volume control unit, thereby securing more dead air and exhibiting high heat insulation.

In addition, the present invention is advantageous in that the hollow portion and the spontaneous crimp structure are excellent in light weight and heat retention as well as bulging 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 may be defined as R, the radius of curvature of the valley may be defined as r, and R and r values that are different from each other may be determined for each volume controller (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.

Hereinafter, this embodiment will be described.

Examples 1 to 3

Using 4, 6 and 12 fibers with a volume control of 0.64 as the limiting viscosity. 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 7 Da and a fiber length of 64 mm was produced.

Comparative Examples 1 to 3

Circular hollow fiber having circular cross section fiber, circular hollow cross section fiber and polyester intrinsic viscosity of 0.64 and 0.50 were produced in the same manner as in Example 1.

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

* Bulkability of composite fibers

end. Test Methods

  - Quantify 20 ± 2g 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.

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.

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 (10)

In the modified hollow fiber,
Wherein the fiber comprises a hollow portion, a shape retaining portion, and a volume control portion,
The volume control part may protrude in a direction opposite to the center of the fiber, and the distal end part may have a round shape,
Wherein the uppermost portion of the end portion of the volume control portion is defined as a peak, and the portion between the volume control portions is defined as a valley.
(1) -3? Z? 4
(2) 0.9?

1.8
here,
Z: Deviation between the curvature radius R of the peak and the curvature radius r of the valley
R: radius of curvature of peak
r: radius of curvature of the valley
(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 delete delete The method according to claim 1,
Wherein the volume control is formed through a radially deployed spinneret to form the volume control. 5. The method of claim 4,
Wherein the radially deployed angle is in the range of 10 to 17 degrees with respect to a center point (M). The method according to claim 1,
Wherein the volume control unit comprises 4 to 12 hollow fibers. The method according to claim 1,
Wherein the hollow portion has a hollow ratio of 15 to 30%. A fiber aggregate comprising a fiber according to any one of claims 1 to 7. 9. The method of claim 8,
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. 9. The method of claim 8,
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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