KR101206821B1 - Elastic fiber structure and method of fabricating the same - Google Patents

Abstract

The present invention relates to an elastic fiber structure and a method for manufacturing the same, specifically, a polyester-based polymer having an intrinsic viscosity of 0.45 to 0.56 with a hollow polyester fiber of 5 to 80% by weight and an intrinsic viscosity of 0.63 to 1.30 5 to 80% by weight of a stretch fiber including a composite fiber made of a phosphorus polyester polymer and 5 to 80% by weight of a heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C. The present invention relates to an elastic fiber structure and a method for producing the same having excellent durability.

Description

Elastic fiber structure and manufacturing method thereof {ELASTIC FIBER STRUCTURE AND METHOD OF FABRICATING THE SAME}

The present invention relates to an elastic fiber structure and a method for producing the same, which is soft and elastic recovery performance is continuously excellent.

In general, the most widely used cushioning material used in everyday life is a polyurethane foam (commonly referred to as "sponge"), and is widely used due to its advantages of being light, elastic, and inexpensive. However, polyurethane foams with a sparse foam of polyurethane resin have a peculiar smell, yellowing phenomenon occurs over time, elasticity decreases due to corrosion of the foam cell itself, dust is generated, and recycling is difficult. there was.

Therefore, a great deal of attention is being paid to the material to replace the polyurethane foam, but the situation that the material showing a satisfactory effect has not been presented.

Thus, Korean Patent Publication No. 1990-8073 discloses a fiber-forming polymer having a melting point of 100 ° C.-220 ° C., having one or more hollows continuous to the fiber axis, and having a hollow ratio of 5-80%, after stretching. Heat-adhesive fibers with single yarn fineness of 0.5-30 denier, 3-40 sheets / inch of crimp, and 10-150 mm of fiber length have been proposed, but lack of elasticity and poor strength due to low strength of the fiber itself. There is this.

In addition, Korean Patent Invention No. 908340 discloses 10 to 70% by weight of polyester conjugate fiber, 10 to 70% by weight of polyester conjugate fiber surface-treated with oil containing silicon, It consists of 10 to 70% by weight of low melting point heat-sealed binder fiber and 10 to 70% by weight of a sheath type composite fusion fiber made of polyester or polystyrene. Next, the laminated web is bonded by needle punching using a needle with a barb to form a sheet, and the sheet is passed through a dry box and a heating roller to be fusion bonded. Although a highly elastic nonwoven fabric has been proposed, it is produced by mixing webs by mixing two kinds of conjugate fibers and heat-sealed binder fibers to produce a nonwoven fabric. Greater possibility degrees repeat durability of the elastic structure is dropped during use to be elastic and resilient recovery degraded away, the touch feeling of greater concern is different from the polyurethane foam surface.

In addition, Korean Patent Publication No. 2008-80144 discloses a molded article obtained by thermoforming a fibrous spherical body in a mold, wherein the fibrous spherical body has a melting point of at least 40 ° C lower than the melting point of (a) the inelastic polyester and the inelastic polyester. A composite short fiber in which an elastic thermoplastic elastomer having a compound is disposed, wherein the inelastic polyester is exposed so that 25% to 49% of the surface of the composite short fiber is formed, and (b) a polytrimethylene terephthalate-based short fiber Although a molded article consisting of a highly elastic fiber spherical body has been proposed, wherein a part of its fiber entanglement is thermally fixed at a flexible hot-fixing point, special equipment for forming the spherical body is required, resulting in an increase in manufacturing cost. do.

In addition, when the nonwoven fabric is simply laminated with a conventional short-fiber fiber, and heat-treated, and taken out of the mold, the surface touch of the nonwoven fabric has a hard disadvantage.

Therefore, the existing equipment can be used as much as possible to improve the applicability and economy as cushioning materials such as car seat cover pads, vehicle interior linings, bedding mattresses, cushion pads, bra wicks, ski clothes or winter wear padding materials. It is required to develop a material which can be manufactured by using, exhibits a soft touch and has excellent high resilience and durability.

In order to solve the above problems, an object of the present invention is to provide a soft yet resilient elasticity and durability and environmentally friendly elastic fiber structure and its manufacturing method.

In order to achieve the above object, the present invention provides a polyester-based polymer having an intrinsic viscosity of 0.45 to 0.56 with a hollow polyester fiber 5 to 80% by weight, intrinsic viscosity (IV) of 0.63 to 1.30. It provides an elastic fiber structure comprising 5 to 80% by weight of a stretch fiber comprising a composite fiber consisting of an ester-based polymer and 5 to 80% by weight of a heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C.

In addition, the present invention is characterized in that the composite fiber is selected from the group consisting of side-by-side type, sheath-core type, eccentric sheath-core type.

In addition, the present invention is characterized in that the stretch fiber is a side-by-side type of stretch fiber composed of polytriethylene terephthalate having an intrinsic viscosity of 0.90 to 1.30 and polyethylene terephthalate having an intrinsic viscosity of 0.45 to 0.56.

In addition, the present invention includes that the heat-sealed binder polyester fibers are hollow heat-sealed binder polyester fibers.

In addition, the present invention is the hollow polyester fiber is strength 2 ~ 5g / d, elongation 30 ~ 60%, compression rate 10 ~ 50%, compression recovery rate 80 ~ 100%, the polyester stretch fiber 2 ~ 5g strength / d, elongation 40 to 80%, crimp number 10 to 17, crimping degree 14 to 20, shrinkage rate 2 to 10%, fiber length 20 to 90 mm, the heat-sealing polyester fiber is 2 to 5 g / d, Elongation 20 ~ 60%, crimp number 5 ~ 15, crimping degree 10 ~ 20, shrinkage rate of 2 to 8, characterized in that it provides an elastic fiber structure showing a light, soft and excellent elasticity.

In addition, the present invention is the thickness of the hollow polyester fiber 4 ~ 15 Denier, the polyester-based stretch fibers are 2 to 9 denier, the heat-sealing binder polyester fibers are characterized in that 2 to 10 denier.

In addition, the present invention is preferably applied to a variety of applications that the elastic fiber structure is a short-fiber heat-sealed nonwoven fabric.

In addition, the present invention is that the thickness of the nonwoven fabric is 5 to 50mm is good for showing elasticity and cushioning properties.

In addition, the present invention includes a composite fiber consisting of 5 to 80% by weight hollow polyester fiber having a 20% to 60% hollow fiber, a polyester polymer having an intrinsic viscosity of 0.63 to 1.30 and a polyester polymer having an intrinsic viscosity of 0.45 to 0.56. A fiber mixing step of forming a short fiber mixture by mixing 5 to 80% by weight of the stretch fiber and 5 to 80% by weight of the heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C; A carding step of manufacturing the short fiber mixture into a web; A heat treatment step of heat treating the short fiber mixture passed through the carding step at 80 to 200 ° C .; And a cooling step of cooling the heat treated short fiber mixture to produce an elastic fiber structure.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

The elastic fiber structure of the present invention is a composite fiber consisting of a polyester-based polymer having an intrinsic viscosity of 0.45 to 0.56 and a polyester-based polymer having an intrinsic viscosity of 0.4 to 0.56 It may include 5 to 80% by weight of the stretch fiber containing 5 to 80% by weight of the heat-sealing binder polyester fiber melting point 110 ~ 180 ℃, according to the mixing ratio of the hollow polyester fiber, binder polyester fiber and stretch fiber Required features can be expressed.

Therefore, the elastic fiber structure of the present invention is all composed of polyester-based fibers, and is also thermally bonded by the low melting point heat-sealed binder fibers in the fiber structure without the use of an adhesive containing a separate organic solvent in the inter-fiber adhesion, The odor peculiar to the polyurethane foams used in the process, yellowing phenomenon occurs over time, and the elasticity of the foam cells themselves decreases due to corrosion of the foam cells. As well as complementary, there are environmentally friendly effects with similar or superior elasticity, shape stability and chemical stability compared to polyurethane foams.

Specifically, the hollow polyester fiber having a hollow ratio of 20 to 60% is capable of producing a lighter product than a product that does not include hollow fiber due to the hollow in the fiber, and serves to exhibit high elasticity. It is produced by spinning using 2 ~ 6 leaf hollow block and mainly uses 3 leaf hollow block. The hollow ratio can be calculated according to the following formula.

Hollow rate (%) = cross section of hollow part / shear area of fiber (including hollow section) 단면 100

The hollow polyester fiber of the present invention has a hollow ratio of 20 to 60%, preferably 30 to 40%. If the porosity is less than 20%, the size of the fiber cross-section is large, the elasticity is low, there is a fear that the cushioning properties are not exhibited high. There is a problem. Hollow polyester fiber of the present invention is good to express the elasticity while maintaining the strength required to be 2 ~ 5g / d, 30 ~ 60% elongation, 10 ~ 50% compression rate, 80 ~ 100% compression recovery rate.

In addition, the stretch fiber comprising a composite fiber made of a polyester polymer having an intrinsic viscosity of 0.63 to 1.30 and a polyester polymer having an intrinsic viscosity of 0.45 to 0.56 serves to exhibit elastic modulus and compressive recovery. It may be a side-by-side type, sheath-core type, eccentric sheath-core type. Preferably, the side by side type stretch fiber composed of polytrimethylene terephthalate (PTT) having an intrinsic viscosity of 0.90 to 1.30 and polyethylene terephthalate (PET) having an intrinsic viscosity of 0.45 to 0.56 may exhibit high elasticity. The composite fiber form having the viscosity of the two forms may be excellent in elasticity because the different properties of the polymer having each of the viscosity appears according to the difference in viscosity. If it is out of the above range, the stability in the spin pack is lowered, so that the bonding strength between the polymer is bad or the spinning workability is poor due to the bending of the polymer due to the melt viscosity difference during spinning, so that the viscosity range of each polymer constituting the fiber to be maintained It is important to maintain compatibility with each other. The stretch fiber of the present invention exhibits excellent elasticity of 2 to 5 g / d, 40 to 80% elongation, 10 to 15 crimps, 14 to 20 crimps, 2 to 10% shrinkage, and 20 to 90 mm long fiber. good.

In addition, the heat-sealing binder polyester fiber having a melting point of 110 ~ 180 ℃ to maintain the shape stability by bonding between fibers at low temperatures, similar to the heat treatment at a low temperature than conventional polyester of about 250 ℃ It has physical properties and can be subjected to low temperature heat treatment, thereby reducing the heat treatment cost for fusion. If the melting point is less than 110 ℃, there is a fear that the heat resistance during the manufacturing of the product is lowered, if it exceeds 180 ℃ there is no effect of reducing the heat treatment cost. On the other hand, the present invention may be used as the heat-sealing binder polyester fiber, a hollow heat-sealing binder polyester fiber, the hollow fiber having a melting rate of 110 ~ 180 ℃ and 5 to 50% Compared with the existing heat-adhesive fiber, the additional effect contributes to the weight reduction due to the hollow effect inside the yarn even after heat sealing. Heat-sealed polyester fiber of the present invention has a strength of 2 ~ 5g / d, 20 ~ 60% elongation, 5 ~ 15 crimps, 10 ~ 20 crimping, 2 ~ 8% shrinkage to maintain morphological stability when manufacturing the product It is good to show light weight, soft touch.

In addition, the present invention is the thickness of the hollow polyester fiber 4 ~ 15 Denier, the polyester-based stretch fibers are 2 to 9 denier, the heat-sealing binder polyester fibers are 2 to 10 denier is good elasticity and strength of the final product, showing a soft touch, the elastic fiber structure of the present invention When the thickness of the fibers constituting the is less than the above range, respectively, the strength and elongation of the fiber is low, and when the above range is exceeded, the weight is too large and the surface touch may be rough when manufactured as a final product.

On the other hand, the elastic fiber structure of the present invention is to be included in the content of 5 to 80% by weight hollow polyester fiber, 5 to 80% by weight polyester stretch fiber and 5 to 80% by weight of the heat-sealing binder polyester fiber It is good for showing elasticity, strength and durability with soft touch. If the hollow polyester fiber is less than 5% by weight, the final product may weigh too much, and if the polyester stretch fiber is less than 5% by weight, When the elastic expression is lowered and the heat-sealing binder polyester fiber is less than 5% by weight, there is a problem that the binding force of the final product is weakened and the strength is lowered. On the other hand, if the hollow polyester-based fiber exceeds 80% by weight, the compressive permanent shrinkage of the final product may be lowered, and if the polyester-based stretch fiber exceeds 80% by weight of the fiber structure due to shrinkage of the fiber (fiber) If the density rises and the strength is stronger than elasticity, the touch may be rough, and if the heat-sealing binder polyester fiber exceeds 80% by weight Repulsive elasticity is lowered and the touch of the final product is hardened, there is a fear that the touch is poor.

In the final physical properties, products having a repetitive extrusion reduction ratio of 80% or less, preferably 10 to 80% or repulsive elasticity of 55% or more, preferably 55 to 90% are excellent in elasticity and excellent in maintaining excellent elasticity for a long time. . Beyond the above range, there is a disadvantage in that the shape deformation and rebound elasticity degradation phenomenon due to repeated compression occurs.

Therefore, it is good to use the ratio of each fiber within the said range according to a use for the required physical property.

The elastic fiber structure of the present invention is a short-fiber heat-sealed nonwoven fabric made of a blending ratio of the hollow polyester fiber, polyester stretch fiber, and heat-sealed binder polyester-based fiber in accordance with the purpose, and is easily used as a conventional nonwoven fabric manufacturing facility. It can be manufactured, and is suitable for various applications requiring elasticity. When the thickness of the nonwoven fabric is 5 to 50mm, it is good to show elasticity and cushioning properties. If the thickness is less than 5mm, the thickness is so thin that the elastic effect may be weakened when pressed by hand. As heat transfer is difficult, shape stability decreases.

1 is a manufacturing process diagram of the elastic fiber structure according to an embodiment of the present invention. Referring to FIG. 1, the elastic fiber structure of the present invention may be manufactured including a fiber mixing step S100, a carding step S200, a heat treatment step S300, and a cooling step. The elastic fiber structure of the present invention can be manufactured by using a nonwoven fabric manufacturing apparatus by adjusting the fiber mixing ratio and heat treatment temperature without using a new device, it is easy to manufacture a nonwoven fabric, it is possible to reduce the cost.

Specifically, in the fiber mixing step S100, 5 to 80% by weight of the hollow polyester fiber having a hollow ratio of 20 to 60%, a polyester polymer having an intrinsic viscosity of 0.63 to 1.30 and a polyester polymer having an intrinsic viscosity of 0.450 to 0.560 5 to 80% by weight of the stretch fiber comprising a composite fiber consisting of 5 to 80% by weight of the heat-sealing binder polyester fiber having a melting point of 110 ~ 180 ℃ mixed by adjusting the mixing ratio to meet the required physical properties Proceed with the mixing step to prepare.

Next, after the carding step of manufacturing the short fiber mixture as a web, the heat treatment of the short fiber mixture after the carding step at 80 ~ 200 ℃, the heat treatment is heat treated in a conveyor belt method with hot air at the temperature, the final roller It is good to proceed to the heat treatment step by heat treatment again, the temperature is good to maintain the touch without deteriorating the physical properties of each fiber, hot air to ensure uniform drying without damaging the shape of the manufactured web Good for

  Subsequently, the elastic fiber structure of the present invention may be completed by cooling the heat treated short fiber mixture to proceed a cooling step in which the elastic fiber structure is manufactured.

As described above, the elastic fiber structure of the present invention includes hollow polyester fibers, polyester stretch fibers, and heat-sealed binder polyester fibers to provide a light, soft touch and excellent elasticity and durability.

In addition, the elastic fiber structure of the present invention can be easily adjusted so as to exhibit various characteristics of each fiber by varying the mixing ratio of the fibers constituting the structure, there is an effect that can be applied to various applications.

In addition, since the elastic fiber structure of the present invention is all composed of polyester-based fibers, and is thermally bonded by the low-melting hot-melt binder fibers in the fiber structure without using any adhesive when bonding between fibers, it is similar to the conventional polyurethane foam It has excellent elasticity, but exhibits form stability and chemical stability, and has an environmentally friendly effect.

In addition, the method of the present invention is easy to manufacture non-woven fabrics by using the existing apparatus and there is a cost saving effect.

The elastic fiber structure of the present invention has an effect that is applied to a cushioning material, such as car seat cover pads, vehicle interior materials, bedding mattresses, cushion pads, bra wicks, ski clothes or winter clothing padding material.

1 is a manufacturing process of the elastic fiber structure according to an embodiment of the present invention.
Figure 2 is a schematic diagram of the measuring device for the elastic sample of the present invention (a) permanent compression rate measuring machine, (b) rebound elasticity measuring machine.

Through the following examples will be described in more detail.

Example 1

Hollow Poly 34%, Fineness 8.0 Denier, Strength 3.3g / d, Elongation 51%, Compression 46%, Compression Recovery 91%, Hollow 30%, Hollow Polyethylene Terephthalate (PET) Fiber 64mm Fiber (Fiber A) 45 PolyTrimethylene Terephthalate (PTT) with weight%, fineness 2.5 denier, strength 2.8 g / d, elongation 105%, crimp elongation 52%, recovery rate 32%, shrinkage 96%, fiber length 64mm, intrinsic viscosity 0.95 45% by weight of side by side type stretch fiber (fiber B) made of polyethylene terephthalate (PET) having an intrinsic viscosity of 0.52, fineness 4.4 denier, strength 3.6 g / d, elongation 40%, crimping water 9.4, crimping Figure 16.5, shrinkage rate of 6.4%, filament length 64mm heat-sealing binder polyethylene terephthalate fiber (fiber C) by mixing 10% by weight to form a short fiber mixture and mixing in a carding machine, the carding step of manufacturing the mixture into a web After this, it is conveyed by 170 ℃ hot air After the heat treatment by the ear belt method, and further heat treatment at the final roller at 150 ℃ and cooled at room temperature to prepare a non-woven fabric having a thickness of 15mm and a weight of 330 g / m ² .

Example 2

70% by weight of fiber A, 20% by weight of fiber B and 10% by weight of fiber C were prepared as in Example 1 to prepare a nonwoven fabric having a thickness of 15 mm and a weight of 300 g / m ² .

Example 3

20% by weight of fiber A, 70% by weight of fiber B and 10% by weight of fiber C were prepared as in Example 1 to prepare a nonwoven fabric having a thickness of 15 mm and a weight of 350 g / m ² .

Example 4

Fiber A was prepared by mixing in 35% by weight, fiber B 35% by weight and fiber C 30% by weight to prepare a nonwoven fabric having a thickness of 15mm and weight 410 g / m ² .

Comparative Example 1

The same procedure as in Example 1 was conducted except that fiber A was 4% by weight, fiber B was 11% by weight, and fiber C was 85% by weight.

Comparative Example 2

The same procedure as in Example 1 was conducted except that the fiber A was 5% by weight, the fiber B was 85% by weight, and the fiber C was 10% by weight.

Comparative Example 3

Fiber A was carried out in the same manner as in Example 1 except that 85% by weight, fiber B was 5% by weight, and fiber C was 10% by weight.

* Test Methods

1) Compression permanent reduction rate (room temperature and 70 ℃)

The test piece was made in a square of 50 mm or more in length and 20 mm or more in thickness, and was compressed and fixed to 50% of the thickness of the test piece with a compression plate, and maintained for 22 hours in a constant temperature or 70 ° C constant temperature bath. After leaving for 30 minutes at room temperature, the thickness was measured and calculated by the following equation.

C = ( t ₀ - t ₁ ) / t ₀ × 100

C: permanent compression rate (%)

t ₀ and t ₁ : Thickness of test piece before and after test (mm)

2) resilience

The test piece was made into a square with a side length of 50 mm or more and a thickness of 50 mm or more. A steel ball with a weight of 16 g and a diameter of 16 mm was dropped on the test piece at a height of 500 mm, and the maximum rebound height was measured. At least three times or more of rebound values were measured continuously, and the median value was made into the rebound elastic value (%).

2 is a schematic diagram of a measuring device for an elastic sample of the present invention, showing (a) a permanent compression rate measuring machine and (b) a rebound elasticity measuring machine.

3) Air resistance (Air permeability)

As a measurement standard, ASTM F778-88 or JIS P 8117 (average twice) was used, but in the present invention, JIS P 8117 (average twice) was used.

In the measurement method, first measure the thickness of the sample twice to find the average value (unit: mm), and then prepare the specimen in the size of 2.5cm × 2.5cm. The prepared dry sample is mounted on an automated permporometer (manufacturer: Porous Materials Inc.), model name: CFP-1200-AEL, and connected to an air inlet line. do.

After that, click Execute autotest button in the main menu of the computer program connected to the device, and click show advanced settings. Enter the file location, name, sample name, and sample thickness. Select air permeametry from the test type and start the test. When the report is finished after the analysis, select the coefficients to be expressed in the permeability test report (Darcy, Gurley, Frazier, Rayl), and then report the Gurley method (JIS P 8117). ) The average value of two times is described.

 Calculation

4) Emotional Evaluation

The softness was evaluated by pressing the nonwoven surface.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Fiber A (% by weight) 45 70 20 35 4 5 85 Fiber B (% by weight) 45 20 70 35 11 85 5 Fiber C (% by weight) 10 10 10 30 85 10 10 Nonwoven Thickness (mm) 15 15 15 15 15 15 15 Final heat treatment temperature (℃) 150 150 150 150 150 150 150 Permanent compression
(70 ℃,%) 57 75 42 70 30 50 82 Resilience (%) 65 57 46 72 20 52 53 Air resistance (sec / 100ℓ) 0.19 0.15 0.17 0.26 0.45 0.16 0.13 Weight (g / m ² ) 330 300 350 410 550 470 270 Emotional Evaluation
Nonwoven surface pressed Softness a little
crustiness Very soft crustiness crustiness a little
Softness a little
Softness

As a result of Table 1, when the ratio of the hollow PET fiber is increased, the overall weight is reduced and the air resistance is low (good air permeation). In addition, it was confirmed that the elastic modulus is improved when the ratio of the stretch yarn is increased, and the shape stability is increased when the ratio of the heat-sealed binder fiber is increased.

In addition, it was confirmed that Examples 1, 2 and 4 exhibited more excellent elasticity than Comparative Examples 1 to 3, and Examples 1 and 3 exhibited more excellent effects in terms of soft touch.

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)

Stretch fiber 5 ~ 80% by weight of hollow polyester fiber 5 ~ 80%, stretch fiber including composite fiber composed of polyester polymer with intrinsic viscosity 0.63 ~ 1.30 and polyester polymer with intrinsic viscosity 0.45 ~ 0.56 An elastic fiber structure comprising 80% by weight and 5 to 80% by weight of a heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C. The method of claim 1,
The composite fiber is an elastic fiber structure is a fiber selected from the group consisting of side-by-side type, sheath-core type, eccentric sheath-core type. The method of claim 1,
The stretch fiber is a side-by-side type of stretch fiber composed of polytriethylene terephthalate having an intrinsic viscosity of 0.90 to 1.30 and polyethylene terephthalate having an intrinsic viscosity of 0.45 to 0.56. The method of claim 1,
The heat-sealed binder polyester fiber is an elastic fiber structure is a hollow heat-sealed binder polyester fiber. The method of claim 1,
The hollow polyester fiber has a strength of 2 ~ 5g / d, elongation 30 ~ 60%, compression rate 10 ~ 50%, compression recovery 80 ~ 100%, the polyester stretch fiber has a strength of 2 ~ 5g / d, elongation 40 ~ 80%, 10-15 crimps, 14-20 shrinkage, 2-10% shrinkage, 20-90mm fiber length, the heat-sealed polyester fiber has a strength of 2-5g / d, elongation 20-60% , 5-15 crimps, 10-20 crimps, 2-8% shrinkage. The method of claim 1,
The hollow polyester fiber has a thickness of 4 to 15 denier, the polyester stretch fiber is 2 to 9 denier, the heat-sealing binder polyester fibers are 2 to 10 denier. The method of claim 1,
The elastic fiber structure is a short fiber heat-sealed nonwoven fabric elastic fiber structure. The method of claim 7, wherein
The nonwoven fabric is 5 to 50mm thick elastic fiber structure. 5 to 80% by weight of hollow polyester fiber having a 20% to 60% hollow fiber, a polyester fiber having an intrinsic viscosity of 0.63 to 1.30, and a stretch fiber comprising a composite fiber comprising a polyester polymer having an intrinsic viscosity of 0.45 to 0.56 A fiber mixing step of forming a short fiber mixture by mixing 80% by weight and 5 to 80% by weight of a heat-sealing binder polyester fiber having a melting point of 110 to 180 ° C;
A carding step of manufacturing the short fiber mixture into a web;
A heat treatment step of heat treating the short fiber mixture passed through the carding step at 80 to 200 ° C .; And
A cooling step of cooling the heat treated short fiber mixture to produce an elastic fiber structure;
Method of producing an elastic fiber structure comprising a.

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