KR102227679B1 - Spinneret being able to form noncircular cross-sectional shape, yarn with noncircular cross-sectional shape manufactured using the same and method for manufacturing the same yarn - Google Patents

Abstract

The present invention relates to a spinneret that is easy to manufacture a deformed cross-section, a deformed cross-sectional yarn manufactured using the same, and a method for manufacturing the same, and specifically, it is possible to rapidly cool the fiber-forming component during the manufacturing of the deformed cross-section, thereby forming fibers. The present invention relates to a spinneret for which it is easy to manufacture a deformed cross-section yarn that is as close as possible to an intended shape by minimizing the deformation of a component, and to a deformed cross-section yarn manufactured using the same, and a method of manufacturing the same.

Description

Spinneret for easy manufacturing of the shape of a deformed cross-section, and a method of manufacturing the deformed cross-section yarn manufactured by using it {SPINNERET BEING ABLE TO FORM NONCIRCULAR CROSS-SECTIONAL SHAPE, YARN WITH NONCIRCULAR CROSS-SECTIONAL SHAPE MANUFACTURED USING THE SAME AND METHOD FOR MANUFACTURING THE SAME YARN}

The present invention relates to a spinneret that is easy to manufacture a deformed cross-section, a deformed cross-sectional yarn manufactured using the same, and a method for manufacturing the same, and specifically, it is possible to rapidly cool the fiber-forming component during the manufacturing of the deformed cross-section, thereby forming fibers. The present invention relates to a spinneret for which it is easy to manufacture a deformed cross-section yarn that is as close as possible to an intended shape by minimizing the deformation of a component, and to a deformed cross-section yarn manufactured using the same, and a method of manufacturing the same.

In general, synthetic fibers have many circular cross sections, but for special purposes, they may be given in various shapes such as triangles, squares, stars, and crosses. Synthetic yarns having a cross section other than such a circular section are referred to as deformed section yarns. Deformed cross-section yarn has a large surface area, can give a nut-like gloss or touch, and is used to improve flexural elasticity, stain resistance, heat retention, sweat perspiration and quick-drying properties. The method of manufacturing the above-described deformed cross section can be largely classified into a method of releasing a spinneret or eluting one component through a two-component spinning method, and it is common to use a spinneret of a deformed section. Deformed cross-section yarns are used in a number of ways to improve functions such as deep coloration and quick-drying perspiration. In particular, polyester yarns tend to be greasy after processing, so many attempts have been made to develop deformed cross-section yarns to impart a subtle gloss like silk. The six-leaf-shaped deformed cross-section yarn has the characteristics of excellent deep color and gloss characteristics by causing a diffuse reflection effect, and thus spinnerets and filaments of this type have been developed. As one of the above-described deformed cross-section yarns, the hollow fiber having a high porosity has a small specific gravity and excellent heat retention since the fiber having a high porosity contains a large air layer. Therefore, it has excellent properties that give a warm feeling while being light, and is widely used for heat insulation clothes, blankets, warm blankets, sleeping bags, etc., but the hollow fibers that have been developed so far have a pressure imbalance at the top of the spinning hole during spinning, or the spun polymer melt. In the process of cooling, the yarn is opened by air vortex or the construction is opened during repeated use and the air layer is lost, so there is a drawback in that the repellency, sublimeness, heat retention and dyeing properties are inferior. Conventionally, as a method of increasing the hollowness ratio of the hollow fiber, in Korean Patent Registration No. 0062548, the holding hole has an arc shape that is a part of a circle with a radius of R, and the holding hole protrudes from the vertex of the three sides. Disclosed is a method of manufacturing a hollow fiber using a spinneret for manufacturing a triangular cross-section hollow fiber having three protrusions, and having a gap between each of the holding holes of the three sides, and the shape of the holding hole as a whole is a triangular shape. Using a spinneret in which two or more curved slits are arranged in a circle, the diameter of the hole, the slit width, the length between the curved slit and the slit, the viscosity of the polymer melt, the discharge amount, and the cooling method of the discharge thread are controlled. The method is known.

However, with this method alone, it was easy to manufacture hollow fibers with circular cross-sections, but in the case of manufacturing deformed cross-sectional yarns with high degree of releasability such as cross-shaped, pentagonal, hexagonal, and C-shaped hollow fibers, the slow cooling rate of the fiber-forming component during the spinning process. There is a problem in that the fiber is deformed and the degree of release is reduced, resulting in a different shape from the intended cross-sectional shape.

For example, referring to FIGS. 1, 3, and 5, fiber-forming components were spun using a slit-type spinneret to manufacture U-shaped, circular hollow fibers, and C-shaped hollow fibers. This has a problem in that the fiber-forming component after spinning and before being cooled below the glass transition temperature loses the shape of the spinneret due to its own cohesive force, and has a fiber cross section deviating from the intended shape.

In addition, even if the fiber-forming component is cooled by increasing the air volume/speed of the cooling air in order to improve the cooling rate, it is difficult to manufacture a deformed cross-section yarn with a high degree of release of a desired shape due to poor mobility due to problems such as thermal insulation of the detention. there was. Therefore, there is an urgent need to develop a technology for a spinneret capable of manufacturing a deformed cross-section yarn having a high degree of release close to a desired shape without controlling the cooling air.

In general, synthetic fibers have many circular cross sections, but for special purposes, they may be given in various shapes such as triangles, squares, stars, and crosses. Synthetic yarns having a cross section other than such a circular section are referred to as deformed section yarns. Deformed cross-section yarn has a large surface area, can give a nut-like gloss or touch, and is used to improve flexural elasticity, stain resistance, heat retention, sweat perspiration and quick-drying properties. The method of manufacturing the above-described deformed cross section can be largely classified into a method of releasing a spinneret or eluting one component through a two-component spinning method, and it is common to use a spinneret of a deformed section. Deformed cross-section yarns are used in a number of ways to improve functions such as deep coloration and quick-drying perspiration. In particular, polyester yarns tend to be greasy after processing, so many attempts have been made to develop deformed cross-section yarns to impart a subtle gloss like silk. The six-leaf-shaped deformed cross-section yarn has the characteristics of excellent deep color and gloss characteristics by causing a diffuse reflection effect, and thus spinnerets and filaments of this type have been developed. As one of the above-described deformed cross-section yarns, the hollow fiber having a high porosity has a small specific gravity and excellent heat retention since the fiber having a high porosity contains a large air layer. Therefore, it has excellent properties that give a warm feeling while being light, and is widely used for heat insulation clothes, blankets, warm blankets, sleeping bags, etc., but the hollow fibers that have been developed so far have a pressure imbalance at the top of the spinning hole during spinning, or the spun polymer melt. In the process of cooling, the yarn is opened by air vortex or the construction is opened during repeated use and the air layer is lost, so there is a drawback in that the repellency, sublimeness, heat retention and dyeing properties are inferior. Conventionally, as a method of increasing the hollowness ratio of the hollow fiber, in Korean Patent Registration No. 0062548, the holding hole has an arc shape that is a part of a circle with a radius of R, and the holding hole protrudes from the vertex of the three sides. Disclosed is a method of manufacturing a hollow fiber using a spinneret for manufacturing a triangular cross-section hollow fiber having three protrusions, and having a gap between each of the holding holes of the three sides, and the shape of the holding hole as a whole is a triangular shape. Using a spinneret in which two or more curved slits are arranged in a circle, the diameter of the hole, the slit width, the length between the curved slit and the slit, the viscosity of the polymer melt, the discharge amount, and the cooling method of the discharge thread are controlled. The method is known. However, with this method alone, it was easy to manufacture hollow fibers with circular cross-sections, but in the case of manufacturing deformed cross-sectional yarns with high degree of releasability such as cross-shaped, pentagonal, hexagonal, and C-shaped hollow fibers, the slow cooling rate of the fiber-forming component during the spinning process. There is a problem in that the fiber is deformed and the degree of release is reduced, resulting in a different shape from the intended cross-sectional shape. For example, referring to FIGS. 1, 3, and 5, fiber-forming components were spun using a slit-type spinneret to manufacture U-shaped, circular hollow fibers, and C-shaped hollow fibers. This has a problem in that the fiber-forming component after spinning and before being cooled below the glass transition temperature loses the shape of the spinneret due to its own cohesive force, and has a fiber cross section deviating from the intended shape. In addition, even if the fiber-forming component is cooled by increasing the air volume/speed of the cooling air in order to improve the cooling rate, it is difficult to manufacture a deformed cross-section yarn with a high degree of release of a desired shape due to poor mobility due to problems such as thermal insulation of the detention. there was. Therefore, there is an urgent need to develop a technology for a spinneret capable of manufacturing a deformed cross-section yarn having a high degree of release close to a desired shape without controlling the cooling air.

The present invention was conceived to solve the above problems, and the first problem to be solved of the present invention is a spinneret that makes it easy to manufacture a deformed cross-sectional yarn having a cross-sectional shape approximating a desired shape even if the intended shape has a high degree of release. Is to provide.

The second problem to be solved of the present invention is to provide a deformed cross-section yarn with improved cross-sectional release degree.

The third problem to be solved of the present invention is to provide a manufacturing method capable of easily manufacturing various types of deformed cross-section yarns regardless of high and low releasability using the spinneret described above.

In order to solve the above-described first problem, the present invention is in the deformed cross-section spinneret including a plurality of detent holes for manufacturing a single deformed cross-section yarn, the spinneret includes three or more detention holes arranged adjacent to each other. However, the plurality of detention holes provide a deformed cross-section spinneret, characterized in that 50% or more of the plurality of detention holes have a cross-section having a deformity of 1.3 or less represented by the following equation (1).

[Equation 1]

In Equation 1, l denotes the perimeter of the cross section of the detention hole, and A denotes the area of the detention hole.

According to a preferred embodiment of the present invention, at least some of the plurality of holding holes arranged adjacent to each other may be formed in contact with each other.

According to another preferred embodiment of the present invention, the sum of the areas of the detention holes with the cross-sectional deformity of 1.3 or less relative to the total area of the detention holes may be 30% or more.

According to another preferred embodiment of the present invention, the single deformed cross-sectional yarn has a deformity of 1.5 or more represented by the following Equation 1 or has a cross-sectional shape having a hollow inside, and the plurality of detention holes arranged adjacent to each other are It may be arranged along the cross-sectional shape.

In Equation 1, l denotes the perimeter of the cross section of the detention hole, and A denotes the area of the detention hole.

According to another preferred embodiment of the present invention, the cross-sectional shape is an oval, polygonal, multi-leaf shape, and any one or more of a shape having a hollow in the center of the shape, a W-shaped and a C-shaped, and a craftsman Confucius (工) type. It may have a shape.

Deformed cross-section spinneret according to another preferred embodiment of the present invention may be one that satisfies Equation 2 below.

[Equation 2]

In Equation 2, d ₅₀ denotes the average diameter of circles having the same area as the area of each of the detention holes having the cross-sectional morphology of 1.3 or less, and L denotes the distance between the two furthest points in the cross-sectional shape. .

In order to solve the second problem described above, the present invention provides a deformed cross-section yarn manufactured by spinning a fiber-forming component through the deformed cross-section spinneret.

In order to solve the above-described third problem, the present invention comprises the steps of: (1) spinning a fiber-forming component through the spinneret of any one of claims 1 to 6; And (2) cooling the fibers formed by spinning in the step (1) using a cooling air. It provides a method for manufacturing a modified cross-sectional yarn comprising a.

According to a preferred embodiment of the present invention, in the step (1), the fiber-forming component may be spun at a spinning speed of 1,000 to 5,500 mpm under an ambient temperature of 260 to 360°C.

According to another preferred embodiment of the present invention, the cooling air in step (2) may be applied to the fibers formed by spinning at a wind speed of 60 mpm or less.

In the case of using the deformed cross-section spinneret according to the present invention, the fiber spun through the holding hole can be cooled faster than the conventional technology even if cooling air is not applied particularly strongly, and the cross-sectional shape of the fiber is less deformed during the cooling process, resulting in a high cross-section. Even in the case of manufacturing a deformed cross-sectional yarn having a release degree, it is easy to manufacture it close to the intended shape.

In addition, the deformed cross-section yarn manufactured by using the above-described deformed cross-section spinneret has a cross-section having a higher degree of release compared to the conventional technique.

1 is a schematic diagram of a cross-section of a spinneret for manufacturing a U-shaped hollow fiber according to the prior art.
2A to 2C are schematic views of a cross section of a spinneret for manufacturing a U-shaped hollow fiber according to a preferred embodiment of the present invention. It is a schematic diagram of a cross section, and FIG. 2B is a schematic view of a cross section of a spinneret with a deformed cross-section in which circular detention holes of different sizes are arranged adjacent to each other, and Fig. 2C is a deformed cross-section consisting of a slit shape and the rest of the detent holes. A schematic diagram of a cross section of a detention.
3 is a schematic diagram of a cross-section of a spinneret for manufacturing a circular hollow fiber according to the prior art.
4 is a schematic diagram of a cross-section of a spinneret for manufacturing a circular hollow fiber according to a preferred embodiment of the present invention.
5 is a schematic cross-sectional view of a spinneret for manufacturing a C-shaped hollow fiber according to the prior art.
6 is a schematic cross-sectional view of a spinneret for manufacturing a C-shaped hollow fiber according to a preferred embodiment of the present invention.
7A and 7B are photographs of cross-sections of a C-shaped hollow fiber according to a preferred embodiment of the present invention and a C-shaped hollow fiber manufactured according to the prior art, respectively.

First, the meaning of terms used in the present invention will be described.

In the present invention, the term "deformed cross section" refers to a cross section other than a circular cross section.

Hereinafter, the present invention will be described in more detail.

As described above, in the case of manufacturing the deformed cross-section yarn according to the conventional technique, there is a problem in that the fiber spun from the spinneret is deformed due to surface tension or the like in the process of cooling, resulting in a change to a shape close to a circular shape. The result was a fiber having a cross-section different from the intended shape, and there was a problem with physical properties different from the intended physical properties.

As a result of the present inventors devoted to research in order to solve such a problem, the plurality of detention holes have a cross-section of a shape having a release degree of 1.3 or less represented by Equation 1 below, in which 50% or more based on the number of detention holes. It was to develop a spinneret with a deformed cross section characterized by having.

[Equation 1]

In Equation 1, l denotes the perimeter of the cross section of the detention hole, and A denotes the area of the detention hole. Through such a spinneret, it is possible to quickly cool the spun fibers and to facilitate the manufacture of deformed cross-section yarns close to the intended shape, and also to easily manufacture irregularly shaped deformed cross-section yarns.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the scope of the present invention is not limited by the accompanying drawings, which are only specific application examples, and those skilled in the art It will be possible to easily add and change components within the range.

The deformed cross-section spinneret of the present invention includes a plurality of detent holes, and is for manufacturing a single deformed cross-section yarn by fibers spun through the plurality of detent holes, which are arranged adjacent to each other. And spun fibers are fused together during cooling to form a single shape.

Therefore, the meaning that the plurality of detention holes are arranged next to each other means that the set of the plurality of detention holes is arranged so as to have the shape of the deformed cross-section to be manufactured as a whole. Accordingly, the fiber-forming components spun by the plurality of detent holes are fused together during cooling to form a single deformed cross-section having a deformed cross section intended to be manufactured.

Specifically, Figure 2a is a view schematically showing the shape of a detent hole of a spinneret with a deformed cross-section for manufacturing a U-shaped deformed cross-section yarn according to a preferred embodiment of the present invention.

Referring to Fig. 2a, the deformed cross-section to be manufactured has a U-shaped cross section, but the spinneret is a small circular detention hole with a diameter of d arranged adjacent to each other at intervals of g instead of a U-shaped detention hole. It can be seen that it contains a number of (100). The circular detention hole 100 has a degree of release calculated according to Equation 1 above. The variance can be calculated as follows.

In the case of spinning the fiber-forming component through such a spinneret, there is an advantage that the cross-sectional shape of the manufactured fiber does not significantly deviate from the shape of the holding hole 100 due to the deformation of the fiber-forming component after spinning.

Specifically, since the holding hole for manufacturing one fiber is made up of a set of a plurality of smaller holding holes 100 instead of one, cooling after spinning can be performed faster, so that deformation of the fiber can be reduced. Unlike the case of manufacturing circular fibers, in the case of manufacturing deformed cross-section yarns such as curved C-shaped, star-shaped, cross-shaped, square, oval, and flat shapes, the detention hole 100 of the spinneret is formed in a desired shape. Even if it is spun, the fiber-forming component has a viscosity before it is cooled. At this time, the fiber-forming component tends to gather in a shape close to a circular cross-section due to the cohesive force of the fiber-forming component, and thus, if not rapidly cooled, the desired cross-sectional shape cannot be maintained. In the case of the spinneret according to the present invention, by separating the spinneret with a deformed cross-section into a plurality of holdout holes 100 having a small size, the surface area of the spun fiber can be increased and cooled faster. Accordingly, it is possible to manufacture a deformed sectional yarn having a deformed cross section close to the shape of the set of the plurality of detention holes 100, that is, the intended cross sectional shape.

Specifically, the detention holes 100 may have a diameter d of 0.05mm to 0.40mm in order to control the cooling rate and stability. If d is less than 0.05mm, the shear rate of the detention is high, resulting in poor movable operability, and in particular, there is a problem that defects such as'hair' occur. In addition, if d exceeds 0.40mm, the discharge amount and draft per unit area are lowered, so there is a problem in that the movable operability is poor.

In addition, Figures 4 and 6 are views schematically showing a cross section of a spinneret for manufacturing a circular hollow fiber and a C-shaped hollow fiber, respectively. All of them are formed in a shape in which circular detention holes 100 having a diameter of d and spaced apart from each other at intervals of g are arranged adjacent to each other in order to manufacture deformed cross-sectional yarns having each cross-sectional shape. Due to the arrangement of the holding holes 100 having such a shape, it is possible to manufacture a circular hollow fiber and a C-shaped hollow fiber having a cross-sectional shape very close to the intended shape as in the case of FIG. 2A.

On the other hand, FIGS. 3 and 5 are views schematically showing a cross section of a spinneret with a deformed cross section for manufacturing a circular hollow fiber and a C-shaped hollow fiber according to the prior art. Able to know. In the case of spinning with the spinneret of Figs. 3 and 4, the fiber spun from the slit-type holding hole 200 is deformed by cohesive force before being cooled to the glass transition temperature or less and deviated from the intended shape, thus having a desired release cross-section. It is difficult to manufacture yarn.

In addition, the detention holes satisfying Equation 1 may have the same area or different from each other. FIG. 2B is a diagram schematically showing a cross section of a spinneret with a deformed cross-section for manufacturing a U-shaped deformed cross-section consisting of a set of small circular detention holes having different areas from each other.

2B, the set of the small detention holes 100 are arranged adjacent to each other to form a U-shaped overall shape as in Fig. 2A, and the largest detention hole 100 and the smallest detention hole 100 are It can be seen that the d values are different from each other.

The deformed cross-section spinneret according to the present invention is made up of a total of three or more detention holes. If the number of detention holes is less than three, the cooling rate of the fibers spun from each detention hole decreases, resulting in severe deformation of the cross-sectional shape of the fibers, making it difficult to manufacture a deformed cross-section yarn having an intended release degree.

The number of detention holes may be more preferably 5 to 50, and more preferably 10 to 30.

More than 50% of each detention hole has a cross section of a shape having a release degree of 1.3 or less represented by Equation 1 below, and accordingly, it is quickly cooled to a desired shape, thereby manufacturing a deformed cross-section yarn.

[Equation 1]

In Equation 1, l denotes the circumference of the cross section of the detention hole, and A denotes the cross-sectional area of the detention hole.

The closer the degree of release is to 1, the closer the cross-section is to the circular shape, and the larger the degree of release, the more complex and elongated the cross section is. Compared to the slit-type detention hole, when the slit-type detention hole is divided into several circular detention holes, quick cooling is possible.Since the detention hole itself is circular, deformation of the fiber by cohesive force does not occur at all. There is an advantage of being easy to manufacture. In the case of a detention hole having a cross section of a shape that is not circular but has a shape having a release degree of 1.3 or less, some deformation may occur, but the deformation is not so large that it is possible to manufacture a deformed cross-section close to the desired shape. If the deformity exceeds 1.3, the deformation occurring in each detention hole increases, making it difficult to obtain a deformed cross-section yarn having a desired cross section.

As described above, since the detention hole having a cross section of a shape having a degree of release of 1.3 or less occupies more than 50% of the total number of detention holes, a deformed cross-section yarn with minimal deformation during spinning can be obtained. The number of detention holes having a cross section of a shape having a degree of release of 1.3 or less may preferably be 60% or more in the whole, more preferably 70%, 80%, and 90% or more, and most preferably all detention holes have a release degree. It may be made of a detention hole having a cross-section of a shape of 1.3 or less.

If the number of detention holes with a cross-section of a shape with a release degree of 1.3 or less is less than 50% of the total number of detention holes, the fibers spun from each detention hole may be greatly deformed during the cooling process, and the resulting deformed cross-section fiber cross-section The shape can deviate a lot from the intended shape.

Specifically, it will be described with reference to FIG. 2C. Figure 2c is a spinneret for the production of a U-shaped deformed cross-section, including one slit-type detention hole 200 and 14 small round detention holes 100, the number of circular detention holes 100 The ratio is about 93%.

In the case of manufacturing in this way, deformation may occur in the vicinity of the slit-type holding hole 200, but little deformation occurs in the portion of the circular holding hole that makes up most of the entire fiber, so that the overall intended U-shaped deformed cross-section Fibers close to the shape of yarn can be produced.

In the spinneret of the present invention, a plurality of detention holes are arranged adjacent to each other, and preferably, at least some of the adjacent detention holes are in contact with each other. When the detention holes are in contact, the fibers spun from the adjacent detention holes can be consistently fused, so that the deformed cross-section yarn can be manufactured in a stable shape.

Each of the adjacent detention holes may have a spacing of 0.05 mm or less. The cooling efficiency is excellent when the spacing between the detention holes is less than 0.05mm, but when the distance exceeds 0.05mm, the discharged polymer is not fused directly under spinning, so that the desired cross-sectional shape is not formed. There is a problem that defects may occur when working on fabric.

According to a preferred embodiment of the present invention, the total area of the detention hole having a cross section of a shape that satisfies the condition 1) compared to the total area of the plurality of detention holes may be 30% or more. As described above, the present invention may include a slit-shaped holding hole in addition to the holding hole having a cross section of a shape that satisfies the condition 1). In this case, when the total area of the detention hole having a cross section of a shape that satisfies the condition 1) is 30% or more of the total area, it is easy to manufacture the fiber close to the intended shape. More preferably 50%, more preferably 70% or more of the area may be occupied by a detention hole having a cross section of a shape that satisfies the condition 1). If the ratio is less than 30%, the shape in which the set of detention holes are arranged and the shape of the cross-section of the manufactured deformed cross-section differ greatly, but desired physical properties may not be obtained.

In addition, preferably, the number of detention holes having a cross section of a shape that satisfies the condition 1) may be 40% or more relative to the total number of the plurality of detention holes. More preferably, the number of detention holes having a cross section of a shape satisfying condition 1) may be 60% or more. Most preferably, the number of detention holes having a cross section of a shape satisfying condition 1) may be 80% or more.

If the ratio is less than 40%, the shape in which the set of detention holes are arranged and the shape of the cross section of the deformed cross-section produced by spinning through it are significantly different, but desired physical properties may not be obtained.

The spinneret for manufacturing a deformed cross-section yarn according to the present invention is, for example, a polygon, oval, multi-leaf shape, and a cross-sectional shape of any one or more of a shape with a hollow in the center of the shape, a C-shape, a W-shape, and a craftsman Confucius (工) type. It may be for manufacturing a modified cross-section yarn having. The shape of the deformed sectional yarn is not necessarily limited thereto, and a person skilled in the art can freely select and manufacture a desired shape in order to impart specific physical properties to the fiber. Such a shape can be obtained by spinning a set of detention holes in which a plurality of detention holes are arranged adjacent to each other as described above in the same shape as described above.

In addition, according to another preferred embodiment of the present invention, the detention holes of the spinneret of the deformed cross-section may satisfy Equation 2 below.

[Equation 2]

In Equation 2, d ₅₀ denotes the average diameter of circles having the same area as the area of each of the detention holes having the cross-sectional morphology of 1.3 or less, and L denotes the distance between the two furthest points in the cross-sectional shape. .

If _{the value of d 50} /L is less than 1/20, the size of each detention hole is too small, and the cross-sectional shape of the manufactured deformed cross-section yarn may not be stable, and if it exceeds 1/3, the size of the detention hole is too large for cooling. There is a problem in that it is not possible to manufacture a deformed cross-section yarn having a desired degree of release due to a large deformation during cooling due to a slow speed.

Hereinafter, a description will be given of the deformed cross-section yarn manufactured through the above-described deformed cross-section spinneret.

The modified cross-sectional yarn according to the present invention may have a release degree of 1.5 or more. The degree of release of the fibers is defined according to Equation 1 below.

[Equation 1]

In Equation 2, l denotes the circumference of the cross section of the fiber, A denotes the cross-sectional area of the fiber, and the release degree denotes the number of times the circumference of the circular fiber having the same cross-sectional area.

delete

The modified cross-sectional yarn according to the present invention may preferably be a polyester-based fiber. More preferably, it may be a polyethylene terephthalate (PET)-based fiber.

Hereinafter, a detailed description of the cross-sectional shape of the deformed cross-section yarn will be omitted since it overlaps with the above-described matters related to the spinneret.

Hereinafter, a detailed description will be given of a method of manufacturing the deformed sectional yarn. Parts overlapping with the above description will be omitted and described.

The method for manufacturing a deformed cross-section yarn according to the present invention comprises the steps of: (1) spinning a fiber-forming component through a deformed cross-section spinneret; And (2) cooling the fibers formed by spinning in step (1) by using a cooling air.

The deformed cross-section spinneret in step (1) includes three or more detention holes arranged adjacent to each other as described above, and 50% or more of the plurality of detention holes is expressed by Equation 1 below. It has a cross section of a shape having a degree of release of 1.3 or less.

[Equation 1]

In Equation 1, l denotes the perimeter of the cross section of the detention hole, and A denotes the area of the detention hole.

By spinning and cooling the fiber-forming component through such a spinneret, it is possible to quickly cool the fiber after spinning compared to the case of manufacturing a deformed sectional yarn by a process according to the conventional technique, so that the shape of the fiber cross-section is less deformed. Even if it is high, there is an advantage of being able to manufacture a deformed cross section that is very close to the shape of the spinneret.

In the step (1), the fiber-forming component may be spun under an ambient temperature of 260 to 360°C. More preferably, it may be radiated at an ambient temperature of 280 to 320°C. If the ambient temperature is less than 260°C, fusion between the spun fibers may not occur and the physical properties of the fiber may deteriorate. If it exceeds 360°C, it takes a long time to cool down and the fiber cross-section is deformed, resulting in the desired shape. It can be difficult to obtain a deformed cross-section yarn having a cross section of.

In addition, when spinning, it can be spun at a spinning speed of 1,000 to 5,500 mpm to produce a deformed cross-section yarn, more preferably 1,200 to 4,000 mpm, more preferably 1,500 to 3,000 mpm. . Most preferably, it can be spun at a spinning speed of 1,800 mpm to 2,500 mpm.

According to another preferred embodiment of the present invention, in step (2), cooling wind may be applied to the fiber formed by spinning at a wind speed of 60 mpm or less.

If the wind speed exceeds 60mpm, it is not appropriate because the cooling wind is too strong and the spun fibers may be deformed by the wind.

In the method for producing a deformed sectional yarn according to a preferred embodiment of the present invention, polyester may be used as the fiber-forming component, and polyethylene terephthalate (PET) may be used more preferably.

The fiber-forming component may preferably be used having an intrinsic viscosity of 0.50 to 1.00 dl/g. More preferably, those having an intrinsic viscosity of 0.60 to 0.80 dl/g may be used. If the intrinsic viscosity is less than 0.50 dl/g, the spinnability may deteriorate, and if it exceeds 1.00 dl/g, there may be a problem in that the deformed cross-section yarn of a desired shape may not be obtained due to large deformation during cooling.

Hereinafter, the present invention will be described in more detail through examples. The following examples do not limit the scope of the present invention, which should be construed to aid understanding of the present invention.

<Example>

Example 1

After spinning polyethylene terephthalate having a titanium dioxide content of 0.4% by weight and an intrinsic viscosity (η) of 0.652 dl/g through a spinneret in the form of Fig. 2a at a spinning atmosphere temperature of 300°C and a spinning speed of 2,000 mpm, 30 mpom After cooling and solidification at the wind speed of, an emulsion was applied, and then stretched and heat-treated on a godet roller (manufactured by TEK) to produce a yarn at 4,000 mpm. The yarn thus obtained was woven by a conventional method to prepare a fabric.

Here, in the deformed cross-section spinneret, d was 0.15mm, g was 0.03mm, L was 055mm, and there were a total of 17 circular detention holes.

Example 2

Yarn and fabric were prepared in the same manner as in Example 1, except that the spinneret having the shape of FIG. 2B was used for the deformed cross-section spinneret.

Here, in the deformed cross-sectional spinneret, g and L were the same as in Example 1, and there were a total of 17 circular confinement holes, and four types of diameters of different sizes were mixed and arranged, as shown in FIG. 2B. It was placed in the form of arranging the larger one from the end of the shape to the center. When the diameters from the smallest to the largest were d ₁ , d ₂ , d ₃ and d ₄ , d ₁ was 0.10 _{mm, d 2} was 0.20 mm, d ₃ was 0.30 mm, and d ₄ was 0.40 mm.

Example 3

Yarn and fabric were prepared in the same manner as in Example 1, except that the spinneret having the shape of FIG. 2c was used for the deformed cross-section spinneret.

In the deformed cross-sectional spinneret, d, g, and L were the same as in Example 1, and the vertical distance thickness of the slit-type detention hole among detention holes was d, and the total number of detention holes was 13, of which there were 12 circular detention holes.

Example 4

Yarn and fabric were prepared in the same manner as in Example 1, except that the spinneret having the shape of FIG. 4 was used for the deformed cross-section spinneret.

Here, in the deformed cross-section spinneret, d was 0.15mm, g was 0.05mm, and L was 0.40mm.

Example 5

Yarn and fabric were manufactured in the same manner as in Example 1, except that the spinneret having the shape of FIG. 6 was used for the deformed cross-section spinneret.

In the deformed cross-section spinneret, d, g, and L were the same as in Example 4.

Example 6

Yarn and fabric were prepared in the same manner as in Example 1, except for natural cooling without using a cooling air.

Example 7

Yarn and fabric were prepared in the same manner as in Example 1, except that the spinning temperature was changed to 380°C.

Example 8

Yarn and fabric were manufactured in the same manner as in Example 1, except that the cooling wind speed was changed to 70 mpm.

Example 9

Yarn and fabric were prepared in the same manner as in Example 1, except that the spinning speed was adjusted to 5,700 mpm.

Comparative Example 1

Yarns and fabrics were manufactured in the same manner as in Example 1, except that a spinneret having the shape of FIG. 1 was used for the deformed cross-section spinneret.

In the deformed cross-section spinneret, d and L were the same as d and L of Example 1.

Comparative Example 2

Yarn and fabric were manufactured in the same manner as in Example 1, except that the spinneret having the shape of FIG. 3 was used for the deformed cross-section spinneret.

The d and L values in the deformed cross-section spinneret were the same as in Example 4.

Comparative Example 3

Yarn and fabric were prepared in the same manner as in Example 1, except that a spinneret having the shape of FIG. 5 was used for the deformed cross-section spinneret.

In the deformed cross-section spinneret, d and L values were the same as in Example 5.

<Experimental Example>

Experimental Example 1: Operation pass rate measurement

With respect to the fibers manufactured according to Examples and Comparative Examples, spinning and winding on arbitrary 1,200 samples, the ratio of the total production amount of the product to which no trimmings or appearance defects were found is calculated as the rate of acceptance of operation (spinning operability). And measured.

Experimental Example 2: Measurement of release degree

The yarns of the fibers prepared according to Examples and Comparative Examples were cut with a knife, and the cross-section was taken with a SEM (x50, manufactured by Nikon Corporation), and the cross-sectional photograph was analyzed with BMI PLUS SE, and the release degree was obtained according to Equation 1 below. Calculated.

[Equation 1]

In Equation 1, l denotes the perimeter of the cross section of the detention hole, and A denotes the area of the detention hole.

Experimental Example 3: Fabric functional evaluation

The fabrics prepared according to the Examples and Comparative Examples were visually checked by 15 random experimenters and were made to touch the touch, and then the uprightness of the pile and the degree of softness of the fabric were evaluated as good or bad.

The evaluation criteria are as follows.

Good: 2/3 or more rated good

Moderate: More than 1/3 and less than 2/3 people rated good

Poor: Less than a third of people rated as good

The results evaluated as described above are respectively described in Table 1 below.

division Form of detention Atmosphere temperature
(℃) Cooling wind speed
(mpm) Spinning speed
(mpm) Operation acceptance rate
(%) Lee Hyung-do Fabric functionality Example 1 U-shaped circular detention hole 300 30 2000 97.5 2.8 Good Example 2 U-shaped circular detention hole
Different size 300 30 2000 97.5 2.64 Good Example 3 U-shaped round + slit type 300 30 2000 97.0 2.52 Good Example 4 Circular hollow park type detention hall 300 30 2000 97.5 2.72 Good Example 5 C-shaped circular detention hole 300 30 2000 97.5 2.84 Good Example 6 U-shaped circular detention hole 300 0 2000 97.3 2.68 Good Example 7 U-shaped circular detention hole 380 30 2000 93.0 2.6 Good Example 8 U-shaped circular detention hole 300 70 2000 89.6 2.88 Good Example 9 U-shaped circular detention hole 300 30 5700 75.5 2.4 Bad Comparative Example 1 U-shaped slit type 300 30 2000 94.5 1.48 usually Comparative Example 2 Round hollow slit type 300 30 2000 93.8 1.4 usually Comparative Example 3 C-shape slit type 300 30 2000 93.6 1.37 usually

Referring to Table 1, the degree of release of the deformed cross-section yarn was very low, less than 1.5 in Comparative Examples 1 to 3 using only the slit-type holding hole, and it was found that deformation occurred greatly from the intended shape. Therefore, it can be seen that the fabric functionality of the fabric is also not good.

On the contrary, the deformed cross-section yarns of Examples 1 to 9 all exhibit a high release degree of 1.5 or more, so that when the fiber is manufactured through the deformed cross-section spinneret according to the present invention, it is understood that the deformed cross-section yarn having a high degree of release can be easily manufactured Could. In addition, in Example 9 in which the spinning speed was too fast and Example 8 in which the spinning speed was too strong, the fabric functionality was poor or the mobility was poor.

Referring to Example 6, it was found that when the deformed cross-section spinneret according to the present invention was used, it was possible to easily manufacture deformed cross-section yarns having a high degree of release even without using any cooling air.

100: slit type detention hole
200: circular detention hall
d: diameter
g: spacing
L: the longest distance in the shape of the deformed section

Claims (10)

In the deformed cross-section spinneret including a plurality of detention holes for manufacturing a single deformed cross-section yarn, the spinneret includes 10 to 30 detention holes arranged adjacent to each other, wherein the plurality of detention holes are numbered ( 50% or more based on 個數) has a cross-section of a shape with a degree of release of 1.3 or less represented by the following equation 1
The single deformed cross-section yarn has a cross-sectional shape having a release degree of 1.5 or more represented by the following Equation 1 or having a hollow inside, wherein the plurality of detention holes arranged adjacent to each other are arranged along the cross-sectional shape. Deformed section spinneret:
[Equation 1]

In Equation 1, l denotes the perimeter of the cross section of the detention hole, and A denotes the area of the detention hole. The method of claim 1,
Deformed cross-section spinneret, characterized in that formed by contacting at least some of the plurality of holding holes arranged adjacent to each other. The method of claim 1,
Deformed cross-section spinneret, characterized in that the total area of the detention hole having a cross-sectional release degree of 1.3 or less compared to the total area of the entire detention hole is 30% or more. delete The method of claim 1,
The cross-sectional shape is an oval, polygonal, multi-leaf shape, and a heterogeneous cross-sectional radiation, characterized in that it has a cross-sectional shape of at least one of a W-shape, a C-shape, and a craftsman Confucius (工) shape Detention. The method of claim 1,
Deformed cross-section spinneret characterized in that it satisfies Equation 2 below:
[Equation 2]

In Equation 2, d ₅₀ denotes the average diameter of circles having the same area as the area of each of the detention holes having the cross-sectional morphology of 1.3 or less, and L denotes the distance between the two furthest points in the cross-sectional shape. . delete (1) spinning a fiber-forming component through the spinneret of any one of claims 1 to 3, 5 and 6; And
(2) cooling the fibers formed by spinning in step (1) by cooling air; Deformed cross-sectional yarn manufacturing method comprising a. The method of claim 8,
In the step (1), the fiber-forming component is spun at a spinning speed of 1,000 to 5,500 mpm under an atmosphere temperature of 260 to 360°C. The method of claim 8,
The cooling air in step (2) is applied to the fibers formed by spinning at a wind speed of 60 mpm or less.

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