KR102488650B1 - Hollow fiber having excellent darkness, complex fiber for manufacturing thereof, fabric comprising the same and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a hollow fiber, and more specifically, a hollow fiber with improved blackness capable of expressing a dark black color without a separate dyeing process and at the same time preventing a decrease in mechanical strength and minimizing hollow collapse, a composite fiber for manufacturing the same, It relates to a fabric comprising the same and a manufacturing method thereof.

Description

Hollow fiber with improved blackness, composite fiber for its manufacture, fabric containing the same, and manufacturing method thereof

The present invention relates to a hollow fiber, and more specifically, a hollow fiber with improved blackness capable of expressing a dark black color without a separate dyeing process and at the same time preventing a decrease in mechanical strength and minimizing hollow collapse, a composite fiber for manufacturing the same, It relates to a fabric comprising the same and a manufacturing method thereof.

Textile dyeing refers to coloring a color or pattern required for fibers or textile products such as yarn, cloth, knitting fabric, etc. using dyes to have practical value. If the dyeing method for coloring is classified into technical methods, it can be divided into the needle method, the printing method, the rolling method, the high-pressure dyeing method, the high-temperature dyeing method, the printing method, the spray method, the dyeing method, and the lead method. However, as a result, it can be classified into a dip dyeing method in which the entire dye is immersed in a dye solution in which the dye is dissolved in a solvent (water) in a single color and only a part of it is dyed, and a printing method in which a pattern is displayed with dyes or pigments of a single color or multiple colors.

The dyeing method of the fiber as described above depends on the physical properties of the fiber. For example, polyester or polyamide fibers having strong hydrophobicity may be dyed using specific dyes such as disperse dyes, reactive dyes, and acid dyes. there is.

On the other hand, dyeing by applying dye on the fabric (or thread) or the fabric made of the fiber has the advantage of being able to dye in various colors and patterns, but by frequent washing during the manufacturing process of the fabric or during use after fabrication There is a problem in that the color of the fabric fades or loses color due to the detachment of the dye.

As a way to solve this problem, another way to express color in the fiber is to include a dye representing a desired color inside the fiber so that the color can be expressed by itself without dyeing.

However, the dye provided inside the fiber has a problem in compatibility with the main material constituting the fiber and can act as a foreign substance, significantly reducing spinning workability during spinning or deteriorating the physical properties of the manufactured fiber.

In particular, hollow fibers are produced when the elution component is reduced in a composite fiber in which the fiber is composed of a non-eluting component and an eluting component, but the eluting component is disposed in the center of the fiber. Collapse of the hollow part can easily occur in the subsequent yarn processing and fabric manufacturing processes.

When the non-eluted component of such a hollow fiber is provided with a pigment, the mechanical strength of the hollow fiber may be further reduced, and there is a problem in that the hollowness cannot be maintained at a desired level.

In addition, when a small amount of pigment is included to prevent this, there is a problem in that a desired level of deep color cannot be expressed.

Therefore, the fiber itself can express a dark color without dyeing, and at the same time, there is no effect on radioactivity, and even after a part of the composite fiber is eluted, the hollow part is formed without lowering the mechanical strength of the hollow fiber by the pigment provided together with the non-eluted component. There is an urgent need to develop hollow fibers that can be maintained continuously.

The present invention has been made to solve the above problems, and the present invention is to provide a hollow fiber that can express a dark black color without a separate dyeing process and at the same time maintains mechanical strength so that collapse of the hollow part is minimized The purpose.

In addition, the present invention is a composite fiber capable of realizing a hollow fiber in which collapse of the hollow part hardly occurs because the mechanical strength is secured even though the hollow fiber produced after the elution component of the composite fiber is eluted expresses a dark black color. for another purpose.

In addition, another object of the present invention is to provide a fabric that has excellent mechanical strength and does not require separate dyeing as it expresses a dark black color and prevents color change even after washing.

In order to solve the above-mentioned first problem, the present invention, a hollow part; a fiber portion surrounding the hollow portion including black pigment; and a gap continuously formed in the longitudinal direction of the fiber to improve the darkness by allowing at least a portion of the light incident on the fiber to directly enter the hollow portion without passing through the fiber portion, wherein the black pigment includes a fiber portion Provides a hollow fiber with improved blackness, which is included in 1.1 to 2.2% by weight relative to the total weight.

According to a preferred embodiment of the present invention, the fiber unit may further include any one or more fiber-forming components of a polyester-based compound and a polyamide-based compound.

According to another preferred embodiment of the present invention, the hollowness of the hollow fiber may be 30 to 65%.

According to another preferred embodiment of the present invention, the hollow fiber may have a value of 0.11 to 0.20 according to Equation 1 below.

[Equation 1]

According to another preferred embodiment of the present invention, the hollow fiber may have a value of 0.11 to 0.36 according to Equation 2 below.

[Equation 2]

However, the black pigment content is based on the total weight of the fiber part.

According to another preferred embodiment of the present invention, the value according to Equation 2 may be 0.14 to 0.31.

According to another preferred embodiment of the present invention, the hollow fiber may be any one of partially drawn yarn (POY), drawn yarn (SDY) and textured yarn.

In addition, the present invention in order to solve the above-mentioned second problem, the elution portion to form a hollow portion is reduced; and a fiber portion including a color pigment surrounding the elution portion, wherein the elution portion directs at least a portion of incident light after reducing the elution portion into the hollow portion without passing through the fiber portion to improve darkness. It is continuously exposed in the longitudinal direction of the fiber so that a gap is formed, and the black pigment is included in 1.1 to 2.2% by weight relative to the total weight of the fiber portion to provide a composite fiber for manufacturing hollow fibers with improved darkness.

According to a preferred embodiment of the present invention, the eluting part may be an alkali-soluble component or a water-soluble component.

According to another preferred embodiment of the present invention, the composite fiber may have a value of 0.11 to 0.20 according to Equation 3 below.

[Equation 3]

According to another preferred embodiment of the present invention, the composite fiber may have a value of 0.11 to 0.36 according to Equation 4 below.

[Equation 4]

However, the black pigment content is based on the total weight of the fiber part.

According to another preferred embodiment of the present invention, the value according to Equation 4 may be 0.11 to 0.31.

According to another preferred embodiment of the present invention, the percentage of the cross-sectional area of the eluting portion based on the cross-sectional area of the composite fiber may be 30 to 65%.

On the other hand, in order to solve the above-described first problem, the present invention provides a hollow fiber manufacturing method with improved blackness, including the step of reducing the elution portion in the composite fiber according to the present invention.

In addition, the present invention in order to solve the above-described third problem, (1) preparing a composite fiber according to the present invention; (2) preparing a fabric by weaving or knitting yarns containing the composite fibers; And (3) reducing the elution portion in the composite fiber of the manufactured fabric; provides a method for manufacturing a fabric including a hollow fiber having improved blackness.

In addition, the present invention, (a) preparing a hollow fiber according to the present invention; and (b) preparing a fabric by weaving or knitting yarns containing the hollow fibers.

In addition, the present invention provides a fabric comprising hollow fibers having improved blackness, including the hollow fibers according to the present invention.

In addition, the present invention is a yarn having a composite fiber according to the present invention; And non-dyed cotton yarn; provides a denim fabric comprising a.

In addition, the present invention is a yarn having a hollow fiber according to the present invention; And yarn-dyed cotton yarn; provides a denim fabric comprising a.

Hereinafter, terms used in the present invention will be described.

In the present invention, the term "fiber" used herein means 'yarn' or 'thread', and refers to various types of conventional yarns and fibers.

In the present invention, the term "composite fiber" used in the present invention includes the yarn itself produced by conjugate spinning or fibers subjected to processes such as drawing and false drawing, and refers to fibers before the elution portion is reduced.

The hollow fiber of the present invention can express a dark black color without a separate dyeing process, and at the same time, the decrease in mechanical strength is minimized. Hollow fibers that guarantee mechanical strength can minimize hollow collapse and maintain physical properties such as lightness and warmth. In addition, in the case of hollow fibers satisfying specific conditions according to the present invention, it can be more suitable for expressing a dark black color while minimizing a decrease in mechanical strength, so it can be widely applied to various fabrics such as denim fabric.

1 is a partial cross-sectional view of a hollow fiber according to an embodiment of the present invention, and
2 is a cross-sectional view of a composite fiber according to an embodiment of the present invention.
Figure 3a is a cross-sectional view of a composite fiber according to an embodiment of the present invention, Figure 3b is a cross-sectional view of the hollow fiber implemented after the elution portion is reduced in the composite fiber of Figure 3a.
FIG. 4a is a schematic diagram showing an optical path incident on a hollow fiber without gaps, and FIG. 4b is a schematic view showing an optical path of light incident on a hollow fiber with gaps.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein. In order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar components throughout the specification.

As shown in FIG. 1, the hollow fiber according to the present invention includes a fiber portion 10 surrounding the hollow portion E, and includes a gap G formed continuously in the longitudinal direction of the fiber.

First, the fiber unit 10 will be described.

The fiber part 10 includes a black pigment 12 so that the hollow fiber can express a black color, and may further include a fiber forming component 11 for forming the fiber part.

The black pigment is provided in an amount of 1.1 to 2.2% by weight based on the total weight of the fiber part, and through this, a decrease in mechanical strength of the hollow fiber can be prevented and a black color can be expressed. Preferably, the black pigment may be provided in the fiber part in an amount of 1.1 to 1.8% by weight. If the black pigment is provided in less than 1.1% by weight, it is easy to implement hollow fibers having good mechanical strength, but on the other hand, there may be a problem in that a desired level of deep black color cannot be expressed. In addition, if the black pigment is provided in excess of 2.2% by weight, the mechanical strength of the hollow fiber is significantly lowered, causing frequent collapse of the hollow, and it may be difficult to manufacture a fabric with a yarn in a hollow fiber state. In addition, when the black pigment is included in an amount exceeding 2.2% by weight, there is a problem of significantly increasing the internal pressure of the spin pack to reduce radioactivity and shortening the life of the spin pack, and frequent replacement of the spin pack and this There is a problem of increase in manufacturing cost due to this.

The black pigment may be used without limitation in the case of a pigment capable of expressing a conventional black color. However, preferably, the black pigment may be a carbon-based pigment, more preferably any one or more of graphite and carbon black, but is not limited thereto. The black pigment may have a standard shape such as a sphere or an irregular shape. In addition, the average diameter of the black pigment may be 30 to 50 nm. If the average diameter of the black pigment is less than 30 nm, there is a problem in that the dispersibility within the fiber is significantly reduced, and the black pigment is agglomerated and present in the fiber, and the mechanical strength of the fiber portion where the black pigment is agglomerated may be further reduced. In addition, when the average diameter of the black pigment exceeds 50 nm, the content of the black pigment must be further increased to express black with a desired level of light and shade, and there is a risk of deterioration of fiber properties along with the problem of reduced radioactivity there is.

The fiber-forming component may be used without limitation if it is a conventional component that can be implemented as a fiber. As a non-limiting example of this, the fiber-forming component may include any one or more of a polyester-based compound and a polyamide-based compound. The polyester fiber-forming component may be any one selected from the group consisting of polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT). In addition, the polyamide-based fiber-forming component may be any one selected from the group consisting of nylon 6, nylon 66, nylon 6.10 and aramid, but is not limited thereto.

Meanwhile, an inorganic additive may be further provided in the fiber part to make the hollow fiber darker. The inorganic additive may be a known compound, for example, titanium dioxide. When the inorganic additive is provided, the inorganic additive may be provided in an amount of 0.5 to 3% by weight based on the total weight of the fiber unit. If the inorganic additive is provided in an amount of less than 0.5% by weight, there is a problem in that the effect of alleviating the greasy gloss phenomenon peculiar to the fiber is weak. In addition, if the inorganic additive is provided in excess of 3% by weight, it causes mechanical defects of the spinning device such as clogging of the spinning pack filter or damage to the guide and oil roller during spinning, and also causes a problem of deteriorating fiber properties.

Next, the hollow part E disposed inside the fiber part 10 will be described.

The hollow part (E) may have a hollow ratio of 30 to 65% for improved lightness and warmth. If the hollowness rate is less than 30%, there is a problem that the function as a hollow fiber is weak due to low heat retention and lightness of the hollow fiber, and if the hollowness rate exceeds 65%, the strength is lowered due to the thin structure of the fiber part, Through this, the tear strength of the fabric to be woven is lowered, so that the final product is easily torn or the hollow part collapses, so that the effect of the hollow part is not expressed.

On the other hand, the hollow part (E) affects the degree of lightness of the fiber and the degree of expression of black color according to the black pigment included in the fiber part. In other words, even if the black pigment is included in the same amount of fiber-forming component, the degree of black expression is different between a conventional fiber having a black pigment inside the fiber and having no empty space inside and a hollow fiber having an empty space inside. . Specifically, in the case of Comparative Examples 1 and 2 described below in which the black pigment is dispersed in the same content (% by weight) inside mono fibers of the same diameter, hollow in comparison to Comparative Example 1 having no empty space inside the fiber It can be seen that Comparative Example 2 having the negative (60% hollowness) has a remarkably high lightness value (L) measured by a colorimeter. This is because, even if the content ratio of the black pigment based on the fiber-forming component is the same, as the hollow ratio increases, the absolute amount of the fiber-forming component decreases, and accordingly, the absolute amount of the black pigment also decreases.

Accordingly, in order to express the blackness of hollow fibers with increased hollowness to a level similar to that of hollow fibers having the same diameter and small hollowness, the fiber part should be provided with a higher content of black pigment. However, as described above, as the content of the black pigment in the fiber part increases, the mechanical strength of the yarn decreases. In addition, when the content of the black pigment provided in the thin fiber part increases, the mechanical strength is not better, There is also a problem that the life of the pack is also reduced. Therefore, the control of blackness by adjusting the content of black pigment in hollow fibers has clear limitations when compared to non-hollow fibers.

In order to solve this problem, the hollow fiber according to the present invention includes a gap G formed long in the longitudinal direction of the fiber, and as shown in FIG. 1, the outside of the hollow fiber 100 and the inside of the hollow fiber through the gap G The hollow parts (E) of may be in communication with each other. In this case, some of the light incident from the outside of the hollow fiber 100 toward the outer surface of the fiber may be directly incident into the hollow fiber 100 through the gap G, and the light incident directly into the hollow fiber 100 Light may be repeatedly reflected and partially absorbed on the inner surface of the hollow fiber, and through this, the light transmitted from the inside of the hollow fiber to the outside of the fiber is reduced, thereby increasing the blackness of the fiber. The light reflected from the inner surface of the hollow fiber has an effect of further reducing the reflected light as it is difficult to exit the fiber again through the gap G.

Specifically, as shown in FIG. 4a, some of the light (A ₁ ) incident on hollow fibers without gaps can be absorbed (simultaneously transmitted) (A′ ₂ ) through the hollow fibers, but the rest is reflected (A ₂ ). do. On the other hand, as shown in FIG. 4B, when the light incident on the hollow fiber passes through the gap and is incident on the inner surface of the fiber, the incident light (B ₁ ) is repeatedly reflected inside the hollow until all of the light is absorbed (simultaneously transmitted). As the light trapped in the hollow does not easily escape, as a result, the amount of light reflected from the hollow fiber according to FIG. 4b is significantly reduced compared to the light reflected from the hollow fiber according to FIG. 4a. The blackness of the hollow fiber may further increase.

The effect of adjusting the blackness by the gap (G) can solve the problem of lowering the mechanical strength due to the increase in the content of black pigment included in the fiber part of the hollow fiber, and through the control of the gap even with a relatively small content, It is possible to implement black with a degree of light and shade.

On the other hand, the optical movement tendency of light generated on the surface of the fiber other than the gap provided in the longitudinal direction of the monofilament may be similar to that of a hollow fiber having the same diameter and the same hollowness but without gaps, so that the light moves in the opposite direction of the gap of the monofilament. In the case of incident light, it may be difficult to express the desired degree of blackness.

However, when a plurality of monofilaments form a fiber bundle, the direction of the gap in the fiber bundle is randomly determined, so that even when light is incident from any direction, an effect of improving blackness can be obtained through the gap. In addition, if several such yarns are plied and then used as warp and weft yarns to implement a fabric, the direction of the gap of the mono yarns in the fabric can be more random, and accordingly, the blackness of the fabric is uniform regardless of the incident direction of light At the same time, it is advantageous to express more excellent blackness.

The gap may preferably be formed such that a value according to Equation 1 satisfies 0.11 to 0.20.

[Equation 1]

As shown in FIG. 1, the gap distance means the distance between both ends of the discontinuous fiber portion of the fiber portion 10, and the shape of one end of the discontinuous fiber portion is formed round as shown in FIG. When formed as, the shortest distance between both ends of the fiber part may be the gap distance. If the value according to Equation 1 is less than 0.11, it is difficult to adjust the black color to be dark, so it is not easy to implement hollow fibers that achieve desired physical properties, such as light hollow fibers. In addition, if the value according to Equation 1 exceeds 2.0, the gap distance becomes too large, so that the mechanical strength of the hollow fiber is significantly lowered and even when light directly enters through the gap, it is reflected from the inner surface of the hollow fiber and then the gap again As it can be emitted to the outside of the fiber through, the desired level of blackness may not be achieved. Alternatively, it is not easy to achieve the desired physical properties, such as having a problem in that the average diameter of the hollow fibers is too small and it may be difficult to implement the hollowness at a desired level.

On the other hand, the hollow fiber may have a value of 0.11 to 0.36 according to Equation 2 below in order to express more improved blackness, ensure mechanical strength, and better express characteristics as a hollow fiber.

[Equation 2]

At this time, the black pigment is a weight percentage based on the total weight of the fiber part, and the gap angle means an included angle between two lines connecting the center of the hollow part and both discontinuous ends of the fiber part in the cross section of the hollow fiber.

If the value according to Equation 2 is less than 0.11, the hollowness ratio may be reduced, and thus the hollow fiber characteristics may not be expressed at a desired level, and there may be a problem of implementing a light black color. If the value according to Equation 2 exceeds 0.36, there may be a problem in that the mechanical strength of the hollow fiber is significantly lowered and the degree of improvement in blackness is only insignificant.

In addition, more preferably, the value according to Equation 2 may satisfy 0.11 to 0.31 in order to further secure the mechanical strength of the hollow fiber and at the same time extend the life of the spinning pack during spinning to reduce the manufacturing cost. In this case, the content of the black pigment may be 1.1 to 1.8% by weight. If the content of the black pigment exceeds 1.8% by weight and/or the value of Equation 2 exceeds 0.31, it may not be easy to implement hollow fibers having excellent mechanical strength, and the use cycle of the spin pack is significantly extended can be difficult to do In addition, when the content of the black pigment is less than 1.1% by weight and/or less than 0.14 according to Equation 2, it may not be easy to implement black hollow fibers having a darker shade.

The hollow fiber 100 according to an embodiment of the present invention described above may be any one of partially drawn yarn (POY), drawn yarn (SDY) and textured yarn. The texture yarns include false twist yarn (DTY), air texture yarn (ATY), and edge crimped yarn (Edge Crimped yarn). yarn) may be a known texture yarn. In the case of partially drawn yarn (POY) or drawn yarn (SDY), the fineness may be 50 to 200 denier and 18 to 100 filaments for convenience of use and ease of processing. In addition, when the hollow fiber is a false-twist yarn, the fineness may be 30 to 1000 denier and 18 to 720 filaments for convenience of use and ease of processing. However, it is not limited to the above description, and various processed yarns can be made according to the type and purpose of yarn to be manufactured, and the fineness and number of filaments of the processed yarn can be changed according to the purpose.

Specifically, FIG. 3 is a cross-sectional view of a false-twisted hollow fiber according to an embodiment of the present invention. As can be seen from the drawing, the hollow does not collapse at all in the cross section even after twisting, and the hollow fiber with excellent blackness is implemented. there is.

The above-described hollow fiber may be manufactured through a conventional hollow fiber manufacturing method, but preferably, it may be implemented through a composite fiber described later for forming and finely adjusting a desired gap.

As shown in FIG. 2, the composite fiber 100' includes a fiber portion 10' surrounding the elution portion 20' including an elution portion 20' forming a hollow portion and a black pigment 12'; Including, the elution part 20 'has a gap for improving the darkness by directing at least a part of the incident light after the reduction of the elution part to the hollow without passing through the fiber part 10'. It is implemented by composite spinning so that it is continuously exposed in the longitudinal direction of the fiber as much as possible.

A detailed description of the fiber portion 10' is the same as that of the fiber portion of the hollow fiber described above, and thus a detailed description thereof will be omitted.

The elution unit 20' may include an alkali-soluble component or a water-soluble component. The alkali-soluble component or the water-soluble component may be a known component, and the present invention is not particularly limited thereto. Preferably, the alkali-soluble component may include copolyester for composite fibers of Patent Registration No. 10-1487941 by the applicant of the present invention as a reference, and the water-soluble component may be incorporated by reference. The water-soluble copolyester provided in the composite fibers of Patent Registration No. 10-1489437 may be incorporated as a reference.

The elution portion 20 'can satisfy 30 to 65% of the cross-sectional area percentage of the elution portion 20' based on the cross-sectional area of the composite fiber 100', and has an excellent hollowness after the elution portion is reduced through this. Hollow fibers may be implemented.

Meanwhile, the eluting portion may be exposed to the outer surface of the composite fiber such that a value according to Equation 3 below satisfies 0.11 to 0.20.

[Equation 3]

As shown in FIG. 2, the average gap distance means the shortest distance between both ends of the fiber portion 10' spun to be discontinuous in the cross section of the composite fiber. When the value according to Equation 3 satisfies 0.11 to 0.20, it is possible to implement a hollow fiber with a gap in which the value according to Equation 1 above satisfies 0.11 to 0.20, thereby improving mechanical strength and blackness controllability. It may be more suitable for realizing black hollow fibers of darker shades according to the present invention.

In addition, the composite fiber may be a composite fiber having a value of 0.11 to 0.36 according to Equation 4 below.

[Equation 4]

At this time, the black pigment content means the content based on the total weight of the fiber part.

When the composite fiber satisfies the value according to Equation 4, it is more suitable to satisfy the desired numerical value according to Equation 1 in the above-described hollow fiber, and through this, it is possible to more easily implement the hollow fiber expressing the desired physical properties. can Description of specific numerical values is the same as that of Equation 1 described above, and thus detailed descriptions are omitted.

In addition, more preferably, the composite fiber has a black pigment content of 1.1 to 1.8% by weight included in the fiber portion, and the value according to Equation 4 may be 0.11 to 0.31, thereby further expressing desired physical properties At the same time, the life of the spinning pack is not shortened, so it may be more suitable for manufacturing hollow fibers with reduced manufacturing costs. A detailed description of this is the same as the description of Equation 1 in the above-described hollow fiber, so the detailed description is omitted.

The composite fiber is a partially drawn yarn (POY) partially drawn simultaneously with spinning, or a drawn yarn (SDY) drawn separately from the partially drawn yarn or drawn simultaneously with spinning, or a sintering process for the partially drawn yarn or drawn yarn. It can be a texture company.

When the conjugate fibers are partially stretched yarns or stretched yarns, the fineness may be 50 to 200 denier and 18 to 100 filaments for convenience of use and ease of processing. In addition, when the composite fiber is a false-twist yarn as an example of texture yarn, the fineness may be 30 to 1000 denier and 18 to 720 filaments for convenience of use and ease of processing. However, it is not limited to this, and various processed yarns can be made according to the type and purpose of yarn to be manufactured, and the fineness and number of filaments of the processed yarn can vary depending on the purpose and use.

The hollow fiber according to the present invention can be implemented by reducing the elution portion in the above-described composite fiber.

As for the weight loss of the elution unit, specific reduction conditions may vary depending on the specific types of components included in the elution unit, and known elution conditions may be selected according to known elution components, so the present invention is not particularly limited thereto. For example, when the elution component is an alkali-soluble component, the reduction process may be performed through an alkali solution. More specifically, soft winding by plying 1 to 10 composite fibers on a paper pipe for yarn dyeing; and eluting the composite fibers wound around the paper pipe for yarn dyeing through an aqueous solution of 80 to 100 to 1 to 5% by weight of sodium hydroxide.

It is possible to reduce the elution portion by plying the composite fibers in 1 to 10 combinations. Through this, a separate plying process is unnecessary in the subsequent process by adjusting in advance in the reduction step to various fineness and the number of filaments required by consumers when manufacturing fabric. As a result, there is an advantage in responding to consumer demand without reducing manufacturing time, simplifying the manufacturing process, and without additional processes.

The solution for the reduction may preferably be a 1 to 5% sodium hydroxide solution. If the reduction is performed in a sodium hydroxide (NaOH) aqueous solution of less than 1%, the reduction time is long, and the sodium hydroxide in excess of 5% When reducing (NaOH) in an aqueous solution, the fiber-forming component and/or the black pigment are subjected to alkali attack, resulting in defects in the hollow fiber, resulting in a decrease in strength or detachment of the black pigment. The reduction time in the sodium hydroxide (NaOH) aqueous solution may vary depending on the concentration of the sodium hydroxide aqueous solution, but may be preferably 10 to 120 minutes. Preferably, at this time, the reduction temperature may be 80 to 100 °C in the case of normal pressure and 60 to 120 °C in the case of high pressure. If the reduction temperature according to the pressure does not satisfy the above range, there is a problem that the elution portion may be reduced unevenly.

On the other hand, the present invention includes a fabric having a hollow fiber according to the present invention.

The fabric may be a woven or knitted fabric manufactured by weaving or knitting.

First, the structure of the fabric may be formed by any one method selected from the group consisting of plain weave, twill weave, satin weave, and double weave.

When the plain weave, twill weave, and satin weave are referred to as ternary tissues, the specific weaving method for each of the ternary tissues is based on the conventional weaving method, and the fabric can be changed by transforming the tissue based on the ternary tissue or by combining several tissues. For example, there are ridge weave and basket weave as changeable plain weave, and new twill weave, broken twill weave, non-twill weave, mountain type twill weave, etc. there is

The double weave is a weaving method of a fabric in which either one of the warp or weft is doubled or both are doubled, and a specific method may be a conventional double weaving method.

However, it is not limited to the description of the fabric structure, and warp and weft yarn densities in weaving are not particularly limited.

Preferably, the knitting may be performed by weft knitting or warp knitting, and the specific method of weft knitting and warp knitting may be performed by conventional weft knitting or warp knitting.

Through the weft knitting, weft knitted products such as flat, rubber pieces, and pearl pieces can be specifically produced, and through the warp knitting, warp knitted products such as tricots, millinies, and raschels can be specifically produced.

In addition, the fabric may be manufactured by mixing the hollow fiber according to the present invention and a different type of yarn through mixed weaving or mixed knitting. The fabric according to a preferred embodiment of the present invention may be interwoven or interlaced with yarns of different types for the purpose of the fabric to be manufactured and to impart new functions.

Alternatively, in the fabric, the hollow fiber according to the present invention is input as a yarn for fabric manufacturing in a multifilament or two or more multifilament fibers are plied, or a yarn for fabric manufacturing in a state in which hollow fibers are mixed with heterogeneous yarns. can be put into In order to improve the elasticity of the fabric when it is introduced as a mixed yarn in a mixed state, the hollow fiber may be mixed with an elastic yarn such as spandex fiber, which is known to have excellent elasticity, and preferably, the elastic yarn is used as a screening, and the screening is It may be in the form of a covering yarn in which the hollow fiber is covered with superfine yarn.

Accordingly, the fabric may be specifically a denim fabric including a yarn having a hollow fiber and a yarn-dyed cotton yarn according to the present invention. At this time, the yarn may be a covering yarn obtained by screening the above-described stretch yarn and using hollow fibers as the first yarn.

A fabric provided with hollow fibers according to the present invention can be manufactured through a manufacturing method described later.

The first production example is a method for manufacturing a fabric by introducing the hollow fiber according to the present invention into a yarn, specifically (a) preparing the hollow fiber according to the present invention; And (b) preparing a fabric by weaving or knitting yarns containing the hollow fibers; the fabric may be prepared, including.

Alternatively, as a second manufacturing example, a method for preparing a fabric by injecting the composite fibers for manufacturing hollow fibers according to the present invention into yarns, specifically (1) preparing the composite fibers according to the present invention; (2) preparing a fabric by weaving or knitting yarns containing the composite fibers; And (3) reducing the elution portion in the composite fibers of the prepared fabric; it is possible to manufacture a fabric, including.

The second manufacturing example is a method of manufacturing a fabric having hollow fibers by reducing the elution portion of the composite fiber through a weight loss process after manufacturing the fabric with composite fibers, and the specific weight loss process employs the above-described weight loss conditions of the yarn state. At this time, the weight loss process may be performed under known conditions by putting the fabric into a known weight loss machine.

The fabric manufactured through the second manufacturing example may be, for example, denim fabric. Specifically, it may be denim fabric manufactured by inputting a yarn having a composite fiber according to the present invention and a non-dyed cotton yarn as a yarn.

The yarn having the conjugate fiber may be a covering yarn obtained by using the above-described stretchable yarn as a core and covering the conjugate fiber with superfine yarn.

In addition, cotton yarn is provided as the heterogeneous yarn, but undyed cotton yarn is introduced as yarn, which, when a composite fiber is provided in the fabric, must necessarily undergo a weight loss process in the fabric state to include it in the fabric as a hollow fiber. However, the alkali solution used in the weight loss process has a problem of desorbing the dye of the dyed cotton yarn, and accordingly, the color implemented on the fabric after weight loss is different from the color implemented on the fabric before weight loss, and an additional dyeing process is required. there is a problem. Accordingly, in order to prevent the primary dyeing of the yarn state of cotton fiber and the additional secondary dyeing in the fabric state, the cotton yarn is provided in a non-dyed state on the fabric, and after passing through the reduction process of the fabric state, the cotton yarn is dyed through the dyeing process. It is possible to manufacture a fabric expressing a desired color, and through this, it is possible to reduce the manufacturing cost of denim fabric, shorten the manufacturing time, and implement a fabric with better dyeing quality.

Hereinafter, the present invention will be described in more detail through examples, but the following examples are not intended to limit the scope of the present invention, which should be interpreted to aid understanding of the present invention.

<Example 1>

First, to prepare the fiber part, polyethylene terephthalate as a fiber-forming component to be included in the fiber part, carbon black (Orion Engineered Carbon Co., Ltd., HIBLACK® 30) having an average particle diameter of 30 nm as a black pigment, and titanium dioxide having an average particle diameter of 300 nm were prepared, , After melting polyethylene terephthalate at 290, the carbon black and titanium dioxide were added to the prepared fiber to be 1.67% by weight and 0.26% by weight, respectively.

In addition, after melting the alkali-soluble copolyester (Toray Chemical, ESP) at 270 in the elution part, the molten polyethylene terephthalate and the copolyester were combined spun at a weight ratio of 40:60, respectively, to obtain a cross section as shown in FIG. and partially oriented composite fibers (POY) having a filament number of 36 and a fineness of 75 denier were prepared under the conditions shown in Table 1 below. G / R in Table 1 below means a godet roller.

Thereafter, 6 plying is performed on the partially oriented composite fiber (POY) prepared under conditions of yarn speed of 500 m/min, twist number of 3400 TM (twist/m) Z-twist, and heat setting of 165 to prepare a double-twisted composite fiber (DTY) Then, after soft winding the prepared false twisted composite fiber in a paper tube for yarn dyeing, the false twisted hollow fiber (DTY) according to Table 2 was prepared by eluting in a yarn state in an aqueous solution of 95% 4% by weight of sodium hydroxide under normal pressure.

four forms Radiation temperature (℃) G/R1 speed
(mpm, m/min) G/R1 on
degrees (℃) G/R2 speed
(mpm, m/min) G/R2 temperature
(℃) Partially stretched yarn (POY) 285 2930 - 3030 -

<Examples 2 to 6>

It was prepared in the same manner as in Example 1, but the conditions were changed as shown in Table 2 or Table 3 below to prepare twisted composite fibers (DTY) and twisted hollow fibers (DTY).

<Comparative Example 1>

It was prepared in the same manner as in Example 1, but without introducing the components of the elution portion during spinning, only the components of the fiber portion were added to prepare a drawn fiber having a circular cross section as shown in Table 3 below.

<Comparative Example 2>

It is prepared in the same manner as in Example 1, but instead of spinning so that a part of the elution portion is exposed to the outer surface of the composite fiber as in FIG. 2, it is spun so that the elution portion is not exposed to the outer surface of the composite fiber. Composite fibers and hollow fibers were prepared.

<Comparative Examples 3 to 4>

It was prepared in the same manner as in Example 1, but the conditions were changed as shown in Table 3 below to prepare twisted composite fibers (DTY) and twisted hollow fibers (DTY) shown in Table 3 below.

<Experimental example>

The following physical properties of the fibers prepared in Examples and Comparative Examples were measured and shown in Table 2 or Table 3.

1. Blackness evaluation

The L (brightness) and E (color difference) values of the yarn were measured using a color difference meter (CM3700D, Minolta).

As a result of the blackness evaluation, the lower the L, the higher the blackness.

2. Radiation pack replacement cycle

When the spinning process was performed continuously for 24 hours in a spinning device equipped with an exchanged spinning pack, the number of days to reach the pressure was evaluated by taking the time when the spinning pack pressure reached 350 kg / cm 2 as the replacement point.

As can be seen from Tables 2 and 3 above,

Although the content of the black pigment is provided as 1.25% by weight, in the case of Comparative Example 1, which is a non-hollow type, it can be seen that the blackness is excellent despite the small content of the black pigment. On the other hand, in the case of Comparative Example 2, despite having the black pigment in the same content as Comparative Example 1, it can be confirmed that the blackness is lowered according to the hollow part.

Through this, in the case of hollow fibers, compared to general fibers without hollow parts, even if they contain the same amount of black pigment, a similar level of blackness cannot be obtained, and for this, it is clearly known that the hollow fibers must have a higher content of black pigment. can

On the other hand, in the case of Comparative Example 2 having an O-shaped cross section having a hollow rate similar to that of Example 5 having a hollow rate of 30% among the embodiments according to the present invention having a gap, the blackness is the same despite the content of the black pigment It comes out differently, which is due to the effect of the gap according to the present invention described above, that is, the light passing through the gap and entering the hollow fiber is not easily reflected to the outside of the hollow fiber, and the absorbed amount increases, so the blackness is improved It can be seen that the results clearly prove that this is happening.

However, despite having a gap, it can be clearly seen that the hollow fiber of Comparative Example 3 in which the content of the black pigment is less than the range according to the present invention has a high L value, so that the blackness is not significantly better than that of Example 2. there is.

In addition, in the case of Comparative Example 4 and Comparative Example 5 in which the content of the black pigment is provided beyond the range according to the present invention, the blackness is superior to that of the examples, but the degree of improvement in blackness compared to the increased content of the black pigment It is also insignificant, and it can be seen that the use cycle of the radiation pack is significantly reduced.

In addition, in the case of Example 4, in which the content of the black pigment is slightly more than the preferred range according to the present invention, the use cycle of the radiation pack is only half that of Example 3, so considering the frequent replacement of the radiation pack, It can be clearly seen that there is a problem of increasing the manufacturing cost compared to 1 to 3.

Claims (19)

hollow part;
a fiber portion surrounding the hollow portion including black pigment; and
A gap continuously formed in the longitudinal direction of the fiber to improve the darkness by allowing at least a portion of the light incident on the fiber to directly enter the hollow portion without passing through the fiber portion;
The black pigment is included in 1.1 to 2.2% by weight relative to the total weight of the fiber part,
Hollow fibers with improved blackness having a value of 0.11 to 0.31 according to Equation 2 below:
[Equation 2]

However, the black pigment content is based on the total weight of the fiber part. According to claim 1,
The fiber portion further comprises at least one fiber-forming component selected from a polyester-based compound and a polyamide-based compound. According to claim 1,
A hollow fiber with improved darkness of 30 to 65% of the hollow fiber. According to claim 1,
The hollow fiber is a hollow fiber with improved darkness having a value of 0.11 to 0.20 according to Equation 1 below.
[Equation 1]

delete delete According to claim 1,
The hollow fiber is a hollow fiber with improved darkness, which is any one of partially drawn yarn (POY), drawn yarn (SDY) and textured yarn. An elution unit that is reduced to form a hollow part; and
Including; a fiber portion surrounding the elution portion including black pigment;
The elution portion is continuously exposed in the longitudinal direction of the fiber so that at least a portion of the incident light after the reduction of the elution portion is directly incident into the hollow portion without passing through the fiber portion to form a gap for improving darkness,
The black pigment is included in 1.1 to 2.2% by weight relative to the total weight of the fiber part,
Composite fibers for manufacturing hollow fibers with improved darkness having a value of 0.11 to 0.31 according to Equation 4 below:
[Equation 4]

However, the black pigment content is based on the total weight of the fiber part. According to claim 8,
Composite fibers for producing hollow fibers in which the eluting portion is an alkali-soluble component or a water-soluble component having improved darkness. According to claim 8,
The composite fiber is a composite fiber for manufacturing a hollow fiber with improved darkness having a value of 0.11 to 0.20 according to Equation 3 below.
[Equation 3]

delete delete According to claim 8,
Composite fibers for producing hollow fibers with improved darkness, wherein the cross-sectional area percentage of the eluting portion based on the cross-sectional area of the composite fibers is 30 to 65%. Claims 8 to 10 and reducing the elution portion in the composite fiber according to any one of claims 13; Blackness (darkness) improved hollow fiber manufacturing method comprising a. (1) preparing a composite fiber according to any one of claims 8 to 10 and 13;
(2) preparing a fabric by weaving or knitting yarns containing the composite fibers; and
(3) reducing the elution in the composite fibers of the manufactured fabric; fabric manufacturing method including hollow fibers with improved blackness. (a) preparing a hollow fiber according to any one of claims 1 to 4 and 7; and
(b) manufacturing a fabric by weaving or knitting yarns containing the hollow fibers; A fabric comprising a hollow fiber having an improved blackness comprising the hollow fiber according to any one of claims 1 to 4 and 7. A yarn having a composite fiber according to any one of claims 8 to 10 and 13; and
Denim fabric including; non-dyed cotton yarn. A yarn having a hollow fiber according to any one of claims 1 to 4 and 7; and
Denim fabric including; dyed cotton yarn.

Images