KR20190138521A - Hollow Conjugate Yarn with Natural Fiber-like Characteristics - Google Patents

Abstract

The present invention relates to a latent crimped polyester fiber in a side-by-side type using two kinds of polymers. More specifically, the present invention relates to a latent crimped polyester fiber with a natural fiber texture, wherein the polyester fiber uses, as a high viscosity polymer, a polyester copolymer which shows high shrinkage characteristics and has intrinsic viscosity of 0.6-0.85, and is also formed of a general polyester polymer having intrinsic viscosity of 0.4-0.55 as a low-viscosity polymer. The cross section of the polyester fiber has a multi-lobed shape with holes.

Description

Hollow Conjugate Yarn with Natural Fiber-like Characteristics

The present invention relates to a hollow latent crimped polyester fiber having a natural fiber texture. The present invention relates to a hollow fiber having a natural fiber texture having excellent latent crimping performance and initial feeling by spinning two polymers having different physical properties into a hollow cross section by a composite spinning method. It relates to latent crimped polyester fibers.

In the case of clothing, there is a lot of demand for fabrics requiring elasticity for activity, and thus, spantex has been used steadily. However, spandex has a problem in chemical resistance, so there is a disadvantage that an additional covering process is required rather than used alone.

In order to overcome these disadvantages, a fiber that expresses physical elasticity by expressing a crimp by complex spinning a polyester commonly used for clothing is a latent crimped polyester fiber.

As a general method for imparting the potential crimp for the purpose of elasticity, two kinds of polymers having different properties are melted in a complex spinning method, and the composites are spun in the longitudinal direction of the fiber in the form of a side bi-site cross section or an eccentric heart shape When the relaxation heat treatment is performed during the relaxation process of the post process, it is common to express spontaneously uniform high crimp characteristics such as the principle of bimetal having different thermal expansion coefficients. A number of patents are known for manufacturing such spun fibers. As a principle of crimping expression of spun fibers, the yarns are simply flat yarns when stretched or annealed by dry heat or wet heat. Crimp is formed by the heat shrink difference of the has the effect of showing the stretching.

In this method, the first method is to spun fibers each with different shrinkage, and then to produce a composite fiber expressing high crimping ability by using a biaxially blending method, the second method using the same polymer having different intrinsic viscosity, Copolymers having different shrinkage properties, for example, a method of using a copolyester-based polymer having a high shrinkage property and a general polyester-based polymer. The latent crimped composite fiber produced through the spinning and stretching process in this way is not only expressing high crimping characteristics through post-processing, but also used to produce soft knits with excellent soft touch and drape and bulkiness.

The latent crimped composite fiber as described above is used a lot as a fiber for clothing. As such, in order to use it as a fiber for clothing, it has to satisfy various functions such as elasticity, feel, and bulkiness.

In addition, warmth is a very important factor for use as autumn or winter clothing depending on the season.

The warmth may be divided into a passive method of preventing heat loss from the human body and an active concept of actively applying heat from the outside. The former method is to insulate the heat generated from the human body by the air layer of the fabric and to use infrared reflective material that does not radiate the radiant heat emitted from the human body to the clothing. A method of using has been proposed, and the latter method has been proposed in which an electric heating material, a chemical reaction heating heat insulating material, and a solar heat storage heat insulating material are introduced into a coating.

In general, thermal insulation using electric heating materials, chemical reaction heating insulation materials, and solar heat storage thermal insulation materials is performed through excessive post-processing or imparting functionality to the fabric to give a function to the fiber, thereby increasing the production cost and washing. In accordance with the problem that the functionality is gradually reduced according to the thermal insulation is the most used through the insulation effect of the fiber.

Korean Patent Laid-Open Publication No. 1993-0000735, entitled "Insulating middle surface material and its manufacturing method," as the prior art of thermal insulation through the above-described heat insulation effect, by "thermally fusion-cutting a polyester hollow filament having a porosity of 5-40% A hollow staple with both ends closed is made, and the short fibers are pre-needle punched to form a nonwoven web, which is then used for the breathable Spun Bond Sheet. A method of manufacturing a heat insulating middle surface material characterized by superimposing on an aluminum deposition layer formed on one side and then needle punching to bind the two.

However, the conventional technology using a fiber having a hollow as described above is a material for thermal insulation only, there is a problem in that it is not suitable for clothing in the form of a fabric such as fabric due to the lack of physical properties of elasticity or resilience. In addition, the conventional hollow fiber is a circular hollow fiber mostly have a unique texture of synthetic fibers, there was a problem that the consumer is external.

It is an object of the present invention to provide latent crimped polyester fibers having a high elasticity which is an advantage of latent crimped yarns.

Another object of the present invention is to provide a latent crimped polyester fiber having excellent heat retention and resilience while maintaining high elasticity which is an advantage of latent crimped yarn.

It is another object of the present invention to provide a polyester fiber having excellent thermal insulation and resilience at the same time as the above-described problems of the preceding materials, the elastic properties by the potential crimp.

The present invention is a latent crimped polyester fiber composed of a side-by-side type using two kinds of polymers, the polyester fiber is a high viscosity polymer, the intrinsic viscosity is 0.6 ~ 0.85 and polyester having high shrinkage characteristics Hollow type having a natural fiber texture, characterized in that the copolymer is formed of a general polyester polymer having a low viscosity polymer having an intrinsic viscosity of 0.4 to 0.55, the cross section of the polyester fiber is a multi-lobed shape having a hollow Provides latent stretch polyester fibers.

In addition, the high viscosity polymer is neopentyl glycol (NPG) 1 to 30 mol% polyester copolymer or isophthalic acid (isophthalic acid: IPA) 1 to 20 mol to give high shrinkage characteristics to the polyester copolymer It provides a hollow latent crimped polyester fiber having a natural fiber texture, characterized in that the polyester copolymer consisting of% and bisphenol a: (BPA) 1 ~ 10mol%.

In addition, the polyester fiber provides a hollow latent crimped polyester fiber having a natural fiber texture, characterized in that it has a lobe cross section.

In addition, the polyester fiber provides a hollow latent crimped polyester fiber having a natural fiber texture, characterized in that it is formed using a spinneret that satisfies the following conditions (1) to (3).

(1) 1.5 ≤ L / W

(2) 5 <θ / W

(3) W = 0.05-0.15 mm

Where L is the slit length of the lobe, W is the slit width of the lobe, and θ is the inside diameter of the slit

The present invention also provides a stretched yarn comprising hollow latent crimped polyester fiber having a natural fiber texture.

The present invention also provides a false twist yarn comprising hollow latent crimped polyester fiber having a natural fiber texture.

As described above, the hollow latent stretchable polyester fiber having a new natural fiber texture according to the present invention has excellent elasticity due to high crimping and tactile feel due to the multi-leaf cross section by applying copolyester, and thus has highly resilient elasticity and natural fiber texture. It is effective to have.

In addition, the cross section of the fiber has a hollow cross-sectional shape to increase the air content of the air in the fiber has the effect of improving the heat insulation through the heat insulating effect.

Through the present invention, there is an effect that can be extended to the application by imparting characteristics such as elasticity, resilience and thermal insulation to the polyester yarn excellent in chemical resistance.

1 is a view showing a cross section of the hollow latent polyester fibers having excellent elasticity and functionality according to the present invention.
Figure 2 is a view showing a spinneret used in the production of the hollow latent polyester fibers of the present invention.

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 represent 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.

As used herein, the terms 'about', 'substantially', and the like, are used at, or in close proximity to, numerical values when a manufacturing and material tolerance inherent in the stated meanings is given, and an understanding of the invention Accurate or absolute figures are used to assist in the prevention of unfair use of unscrupulous infringers.

1 is a cross-sectional view of the hollow latent polyester fibers having excellent elasticity and functionality according to the present invention, Figure 2 shows a spinning nozzle used in the production of hollow latent polyester fibers of the present invention Drawing.

The present invention relates to a hollow latent polyester fiber having excellent elasticity and functionality in a hollow shape as shown in FIG.

The hollow latent crimped polyester fiber of the present invention is formed of hollow latent crimped polyester fiber composed of two polymers, a high viscosity polymer and a low viscosity polymer.

The high viscosity polymer may use a polyester copolymer having intrinsic viscosity of 0.6 to 0.85 and high shrinkage property, and the low viscosity polymer may use a general polyester polymer having an intrinsic viscosity of 0.4 to 0.55.

In the hollow latent crimped polyester fiber 100 of the present invention, the high-viscosity polymer and the low-viscosity polymer are formed in a weight ratio of 30:70 to 70:30. As shown in FIG. 1, the high-viscosity polymer 110 and the low-viscosity polymer ( It will be preferred that 130) be formed into a side-by-side type to have a hollow cross section.

The polymer used as the high-viscosity polymer is 1-30 mol% polyester copolymer of neopentyl glycol (NPG) or 1-20 mol% of isophthalic acid (IPA) and bisphenol in order to give high shrinkage characteristics. A polyester copolymer composed of 1 to 10 mol% of modified bisphenol (BPA) is used.

In the case of the fiber made of a polyester copolymer having such high water-side characteristics, it shows a shrinkage of 12 to 20% in hot water. The higher the content of the copolymer shows a higher shrinkage characteristics, but may cause poor processability due to the generation of foreign matter and single yarn during sacrifice.

In addition, the difference in intrinsic viscosity of the two polymers of high viscosity and low viscosity is preferably 0.1 to 0.3.

The higher the difference in intrinsic viscosity, the higher the crimping effect due to the shrinkage difference, resulting in higher elasticity.However, the larger the difference in physical properties, the greater the difference in thermal rheological properties of the two polymers, resulting in a more severe curvature on the nozzle surface during spinning. Morphological stability may be impaired, thereby lowering spin processability.

In addition, when the difference in intrinsic viscosity of the two polymers of high viscosity and low viscosity is less than 0.1, crimp formation due to shrinkage difference of the two polymers is difficult to obtain elasticity.

As described above, the hollow latent crimped polyester fiber composed of two polymers of the present invention is formed of a slit 210 for discharging a high viscosity polymer having a shape as shown in FIG. 2 and a slit 230 for discharging a low viscosity polymer. It can be produced through the spinning nozzle (200) it is possible to manufacture a high stretch potential crimping yarn through the stretching process after the composite melt spinning in the form of semi-stretched two polymers.

At this time, spinning in the form of semi-stretched yarn with a spinning speed of 2,500 ~ 3,500m / min can be made of polyester fiber.

In the spinning, the temperature of the two gorod rollers is set to the OFF state, and the speed ratio between the two rollers can be set to 1.0 to 1.2 to produce a semi-drawn yarn. The wound hollow crimped semi-stretched yarn can be drawn to draw ratio 1.5-2.5, heating roller temperature 70 ~ 100 ℃, heating plate temperature 160 ~ 250 ℃ stretched wound.

Alternatively, the draw ratio may be prepared by spinning with a semi-stretched yarn at a speed of 2,500 to 3,000 m / min at 1.5 to 2.5.

If the draw ratio is 1.5 or less, the difference in orientation between the two polymers is high and the low viscosity decreases the crimping effect.If the draw ratio is more than 2.5, the trimming occurs, which causes trimming and adversely affects the final product. , Poor appearance.

Hollow latent polyester fiber excellent in elasticity and functionality of the present invention prepared as described above will be able to be produced by twisted yarn through the yarn processing.

 Hollow latent polyester fibers having excellent elasticity and functionality produced by the present invention can be used as a general fabric or knitted fabric, and excellent elastic performance effect can be obtained by applying high shrinkage high viscosity polymer.

In addition, it can be used as a variety of clothing material, such as pants, jackets, innerwear that requires warmth because of the excellent thermal insulation by the cross section compared to the existing potential winding house.

Hereinafter, an embodiment of a method for producing hollow latent polyester fibers having excellent elasticity and functionality according to the present invention is shown, but the present invention is not limited to the examples.

Examples 1 to 3 and Comparative Examples 1 to 3

The hollow latent polyester fibers having excellent elasticity and functionality according to the present invention were prepared under the compositional conditions as shown in Table 1, and the sensitivity evaluation for the functionality and resilience of elasticity and thermal insulation was carried out.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 High viscosity
0.65 0.65 0.65 0.65 0.65 0.65 NFG 10mol% IPA 8mol%
BPA 5mol% IPA 8mol%
BPA 5mol% IPA 8mol%
BPA 5mol% IPA 8mol%
BPA 5mol% 0 Low viscosity 0.55 0.55 0.5 0.55 0.55 0.55 section 6 leaf hollow 6 leaf hollow 6 leaf hollow circle Circular hollow 6 leaf hollow Crimp rate (%) 47 46.3 49.5 46.6 47.5 10.3 Fairness (%) 92 93 90 94 96 97 Hollow rate (%) 16.2 15.6 17 0 0 70 Warmth 60 65 63.5 27 59 64.3 elasticity ◎ ◎ ◎ ◎ △ x Polish ◎ ◎ ◎ x x ◎

* Intrinsic Viscosity (IV): Each polymer was sufficiently dissolved in 1% concentration in ortho-chlorophenol at 120 ° C, and then measured using a Ubelrod viscometer in a 30 ° C thermostat.

Crimping rate (Tc,%): Take a sample of 1m length skein as long as 3,000 ÷ fineness ÷ 4. When the sample is crimped during the hydrothermal treatment, it is left for 4 hours after removing the load after processing for 20 minutes in hot water (100 ℃) while applying a load of 1g, which is a level at which each fiber strand is not entangled. Let it dry naturally. After the natural drying, 6g of the sample was applied, and after 1 minute, the length L1 was measured. Then, the load of 600g was applied, and after 1 minute, the length L2 was measured. The crimp rate is calculated by the following formula and the calculated value.

Tc (%) = ((L2-L1) / L2) X100

* Fairness evaluation: Grade 1 output / total output * 100 = yield (by weight)

* Insulation: Evaluation by KSK 0560

* Elasticity and gloss evaluation: Relative sensory evaluation by 5 experts (XX: Very bad, X: Bad, △: Normal, ○: Good, ◎: Very good)

As shown in Table 1, Examples 1 to 3 showed excellent characteristics of the functional latent yarn. Comparative Examples 1 and 2 have the characteristics of latent crimp yarns that have undergone a stretching process after complex spinning of a high shrinkage high viscosity polymer and a low viscosity polymer in a general circular cross section.

Examples 1 to 3 of the present invention can be seen that the thermal insulation and rebound elasticity is very superior to Comparative Examples 1 and 2, when compared with Comparative Example 2, both polymers by the intrinsic viscosity of the high viscosity polymer as well as low viscosity polymers It can be seen that the intrinsic viscosity difference of is an important factor for the elastic performance.

The present invention has shown the results of the high shrinkage characteristics of high viscosity, the difference in intrinsic viscosity of high viscosity and low viscosity, the elasticity and thermal insulation and rebound elasticity by the cross-sectional change of the fiber.

Claims (6)

In a latent crimped polyester fiber composed of a side-by-side type using two polymers,
The polyester fiber is a high viscosity polymer using a polyester copolymer having an intrinsic viscosity of 0.6 to 0.85 and high shrinkage characteristics, and is formed of a general polyester polymer having an intrinsic viscosity of 0.4 to 0.55 as a low viscosity polymer.
Hollow latent polyester fiber having a natural fiber texture, characterized in that the cross section of the polyester fiber is a multi-lobed shape having a hollow. The method of claim 1,
The high viscosity polymer is a polyester copolymer of neopentyl glycol (NPG) 1-30 mol% polyester copolymer or isophthalic acid (isophthalic acid: IPA) in order to give high shrinkage characteristics and A hollow latent crimped polyester fiber having a natural fiber texture, characterized in that it is a polyester copolymer composed of 1 to 10 mol% of bisphenol a: BPA. The method of claim 1,
The polyester fiber has a hollow fiber latent crimped polyester fiber having a natural fiber texture, characterized in that it has a leaf cross section. The method of claim 1,
The polyester fiber is hollow latent crimped polyester fiber having a natural fiber texture, characterized in that it is formed using a spinneret that satisfies the following conditions (1) to (3).
(1) 1.5 ≤ L / W
(2) 5 <θ / W
(3) W = 0.05-0.15 mm
Where L is the slit length of the lobe, W is the slit width of the lobe, and θ is the inside diameter of the slit A stretched yarn comprising hollow latent crimped polyester fibers having a natural fiber texture as claimed in claim 1. A false twist yarn comprising hollow latent crimped polyester fibers having a natural fiber texture as claimed in claim 1.

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