SPIN HOLE OF A SPIN DEVICE FOR PRODUCING LYOCELL FIBER AND LYOCELL FIBER

Abstract

The present invention relates to: a spinneret hole of a spinneret device for manufacturing a lyocell fiber. The spinneret hole of a spinneret device for manufacturing a lyocell fiber according to the present invention is provided in a discharge unit for discharging dope in the spinneret device and includes a plurality of slit holes extending in the longitudinal direction, wherein the plurality of slit holes are connected to each other at a central point, and each of the slit holes is provided with at least one step extension portion extending outward along the width direction and positioned at one point between the central point and the end of the slit hole.

Description

Detention hole and lyocell fiber of the detention device for manufacturing lyocell fiber

[0001] The present invention relates to a slit hole of a slit device for manufacturing lyocell fibers and to lyocell fibers, and more particularly, to a slit hole of a slit device for manufacturing lyocell fibers, which has a step expansion portion provided in the slit hole to increase the area of ​​the end of the slit hole, thereby suppressing dope from being concentrated in the center of the slit hole and enabling dope to be evenly distributed to the end of the slit hole, and to lyocell fibers manufactured through the slit hole of the slit device.

[0002] Cellulose acetate fibers are the most commonly used material for cigarette filters, and cellulose acetate is known to be biodegradable. However, cigarette filters made of cellulose acetate retain their original shape for one to two years after being buried in the soil, and it takes a considerable amount of time for them to completely biodegrade.

[0003] Considering the amount and toxicity of tobacco products discarded in the living environment, as well as the amount of tobacco products collected and landfilled as waste after use, it is necessary to further improve the biodegradability of cigarette filters.

[0004] Meanwhile, since cigarettes are a luxury item enjoyed by inhaling the smoke produced during combustion, the more uniform the smoke concentration, the higher the quality of the cigarette. One factor that can be evaluated in relation to smoke concentration uniformity is the filter's suction resistance, which is known to increase proportionally as the filter's filtration efficiency increases.

[0005] In other words, cigarette filters with superior suction resistance not only provide superior filtration performance against harmful substances, but also superior user satisfaction (quality). Therefore, there is a need to develop filter materials that can replace conventional cellulose acetate materials while achieving filter properties, such as suction resistance, at a level equivalent to or higher than conventional technologies.

[0006] Accordingly, lyocell fibers are being developed as a replacement for commercially available cellulose acetate for cigarette filters. Lyocell fibers can be produced by spinning cellulose pulp and a dope, an aqueous solution of N-methylmorpholine-N-oxide (NMMO), through a die.

[0007] For excellent suction resistance, the fiber's specific surface area must be large, and a cross-section with many protrusions, such as a Y-shaped one, can be the most effective. Furthermore, in solution-spinning and wet-dry spinning processes like lyocell, creating a cross-section with multiple protrusions can be a very difficult technology.

[0008] Compared to conventional regenerated fibers like rayon, lyocell fibers possess superior tensile properties and feel, while producing no pollutants. The amine oxide solvents used in the lyocell fiber manufacturing process are recyclable and biodegradable upon disposal. Lyocell fibers are environmentally friendly and are used in a variety of applications, beyond cigarette filters.

[0009] The present invention is intended to solve the above-described problems, and the present invention relates to a slit hole having a step extension part to implement a cross-section with a protrusion such as a Y-shaped cross-section for expanding the specific surface area of ​​the lyocell fiber, and to a slit hole of a slit hole device for manufacturing lyocell fiber, which suppresses the dope from being concentrated in the center of the slit hole and allows it to be evenly distributed to the end of the slit hole by expanding the area of ​​the end of the slit hole, and to lyocell fiber manufactured through the slit hole of the slit hole device.

[0010] The above-described detention hole of the detention device for producing lyocell fiber of the present invention is a detention hole of the detention device for producing lyocell fiber, and is provided in a spinning section for spinning dope in the detention device, and includes a plurality of slit holes extending in the longitudinal direction; the plurality of slit holes are connected to each other at a central point, and the slit holes are provided with a stepped extension portion extending outward in the width direction at any point between the central point and an end of the slit hole, and the slit holes are characterized in that at least one of the stepped extension portions is provided.

[0011] The above-described slit holes of the detention hole of the detention device for manufacturing lyocell fiber of the present invention may be provided in at least three numbers.

[0012] The slit hole of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above includes a second slit hole extending in the longitudinal direction while forming a second width (W2) from the central point, and a first slit hole connected to the second slit hole and extending in the longitudinal direction while forming a first width (W1), and the step expansion portion may be provided at a point where the first slit hole and the second slit hole are connected.

[0013] The step expansion portion of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above can extend perpendicularly to the direction in which the slit hole extends.

[0014] The step expansion portion of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above can extend in a diagonal direction with respect to the direction in which the slit hole extends.

[0015] The above-described step expansion portion of the detention hole of the detention device for manufacturing lyocell fiber of the present invention may be formed in any one shape among a straight line, a curve, a combination of straight lines, and a combination of curves.

[0016] The first width (W1) of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be made to have a value greater than the second width (W2).

[0017] The value of the first width (W1) relative to the second width (W2) of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be 1.25 to 1.75.

[0018] The first width (W1) of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be 0.03 mm to 0.07 mm, and the second width (W2) may be 0.02 mm to 0.05 mm.

[0019] The second slit hole of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above is extended to a second length (L2), the first slit hole is extended to a first length (L1), and the sum of the second length (L2) and the first length (L1) may be 0.2 mm to 0.57 mm.

[0020] The second length (L2) of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be formed to have a value greater than the first length (L1).

[0021] The first length (L1) of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be 0.09 mm to 0.15 mm, and the second length (L2) may be 0.11 mm to 0.42 mm.

[0022] The value of the first length (L1) relative to the sum of the second length (L2) and the first length (L1) of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be 0.22 to 0.45.

[0023] The end of the slit hole of the detention hole of the detention device for manufacturing lyocell fiber of the present invention described above may be formed in a round shape.

[0024] The lyocell fiber of the present invention described above is manufactured through the detention hole of the detention device of the present invention.

[0025] The present invention relates to a slit hole of a slit device for manufacturing lyocell fiber and to lyocell fiber, and has the advantage of being able to suppress dope from being concentrated in the center of the slit hole and evenly distribute the dope to the end of the slit hole by increasing the area of ​​the end of the slit hole while providing a step expansion portion in the slit hole, thereby producing lyocell fiber with a Y-shaped cross-section.

[0026] In addition, the present invention has the advantage of securing spinning fairness by implementing a wide range of fineness and Y-shaped cross-section by providing a step expansion portion in the slit hole and increasing the area of ​​the end of the slit hole, and improving the sharpness of the Y-shaped cross-section of the spun lyocell fiber.

[0027] Figure 1 is a drawing showing a radiating section of a detention device equipped with a detention hole for radiating dope.

[0028] FIG. 2 is a drawing showing a detention hole in which three slit holes having a single-jaw extension are connected at a central point according to an embodiment of the present invention.

[0029] Figure 3 is a drawing showing a Y-shaped detention hole without a step expansion portion and a lyocell radiation dope radiated from the Y-shaped detention hole.

[0030] FIG. 4 is a drawing showing a cross-section of lyocell fibers radiated from a filament hole in which the value of the first width (W1) of the first slit hole relative to the second width (W2) of the second slit hole is 1.2, and the sum of the second length (L2) of the second slit hole and the first length (L1) of the first slit hole (L = L1 + L2) is 0.196 mm.

[0031] FIG. 5 is a drawing showing a cross-section of a lyocell fiber formed according to an embodiment of the present invention, and FIG. 5 is a drawing showing a cross-section of a lyocell fiber radiated from a filament hole in which a value of a first width (W1) of a first slit hole relative to a second width (W2) of a second slit hole is 1.5, and a sum (L = L1 + L2) of a second length (L2) of a second slit hole and a first length (L1) of a first slit hole is 0.2 mm.

[0032] FIG. 6 is a drawing showing a cross-section of a lyocell fiber formed according to an embodiment of the present invention, and FIG. 6 is a drawing showing a cross-section of a lyocell fiber radiated from a filament hole in which the value of the first width (W1) of the first slit hole with respect to the second width (W2) of the second slit hole is 1.25, and the sum (L = L1 + L2) of the second length (L2) of the second slit hole and the first length (L1) of the first slit hole is 0.39 mm.

[0033] FIG. 7 is a drawing showing a cross-section of a lyocell fiber formed according to an embodiment of the present invention, and FIG. 7 is a drawing showing a cross-section of a lyocell fiber radiated from a filament hole in which a value of a first width (W1) of a first slit hole relative to a second width (W2) of a second slit hole is 1.4, and a sum (L = L1 + L2) of a second length (L2) of a second slit hole and a first length (L1) of a first slit hole is 0.45 mm.

[0034] FIG. 8 is a drawing showing a cross-section of a lyocell fiber formed according to an embodiment of the present invention, and FIG. 8 is a drawing showing a cross-section of a lyocell fiber radiated from a filament hole in which a value of a first width (W1) of a first slit hole relative to a second width (W2) of a second slit hole is 1.75, and a sum (L = L1 + L2) of a second length (L2) of a second slit hole and a first length (L1) of a first slit hole is 0.57 mm.

[0035] FIG. 9 is a drawing showing a single-step extension extending diagonally with respect to the direction in which a slit hole extends according to an embodiment of the present invention.

[0036] FIG. 10 is a drawing showing two vertical extensions extending in a vertical direction with respect to the direction in which the slit hole extends and a step extension extending in a step shape through a first connecting portion according to an embodiment of the present invention.

[0037] FIG. 11 is a drawing showing two diagonal extensions extending diagonally with respect to the direction in which the slit hole extends and a step extension extending through a second connecting portion according to an embodiment of the present invention.

[0038] This specification clarifies the scope of the present invention and explains the principles of the invention and discloses embodiments thereof to enable those skilled in the art to practice the invention. The disclosed embodiments may be implemented in various forms.

[0039] Expressions such as “includes” or “may include” that may be used in various embodiments of the present invention indicate the existence of the disclosed function, operation, or component, etc., and do not limit one or more additional functions, operations, or components, etc. In addition, in various embodiments of the present invention, it should be understood that terms such as “includes” or “has” are intended to specify the existence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and do not exclude in advance the possibility of the existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0040] When it is said that a component is "connected, coupled" to another component, it should be understood that while said component may be directly connected or coupled to said corresponding component, there may also be a new component between said component and said other component. Conversely, when it is said that a component is "directly connected" or "directly coupled" to another component, it should be understood that no new component exists between said component and said other component.

[0041] The terms "first," "second," etc., used herein may be used to describe various components, but the components should not be limited by the terms. The terms are used solely to distinguish one component from another.

[0042] The present invention relates to a slit hole of a slit device for manufacturing lyocell fibers and to lyocell fibers. The present invention relates to a slit hole having a step expansion portion to increase the area of ​​the end of the slit hole, thereby suppressing dope from being concentrated in the center of the slit hole and evenly distributing the dope to the end of the slit hole, and to lyocell fibers manufactured through the slit hole of the slit device. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] The lyocell fibers according to embodiments of the present invention can be used for cigarette filters. Because the lyocell fibers according to embodiments of the present invention are highly biodegradable and environmentally friendly as non-plastic materials, they can be used as cigarette filters, replacing cellulose acetate, a plastic material already commercialized. However, this is not limiting, and the lyocell fibers according to embodiments of the present invention can be used in a variety of fields.

[0044] Referring to FIG. 1, lyocell fibers according to an embodiment of the present invention can be produced through a detention device (10).

[0045] Specifically, the above-detected device (10) is provided with a plurality of detaining holes (30) capable of radiating dope in a certain arrangement (20), and the dope, which is a cellulose pulp and N-methylmorpholine-N-oxide (NMMO) aqueous solution, is radiated through the detaining holes (30).

[0046] The lyocell spinning dope radiated from the above-detected hole of the above-detected device (10) is coagulated to obtain a multifilament, and then the multifilament is washed. The washed multifilament can be treated with an emulsion, and then the multifilament is crimped to obtain a crimped tow, thereby producing a lyocell fiber.

[0047] Fig. 1 is a drawing showing the upper surface of the above-mentioned detention device (10) into which dope is introduced. The upper surface into which dope is introduced is formed of circular holes (30) and forms a certain arrangement (20). The lower surface of the above-mentioned detention device (10) from which dope is radiated may be provided with detention holes (100) as shown in Fig. 2.

[0048] The Y-shaped cross-section has a larger area of ​​the detention hole than the O-shaped cross-section, which results in a higher spin draft (elongation ratio) at the same fineness, making it difficult to ensure spin fairness. Specifically, as the fineness decreases, it becomes more difficult to implement the Y-shape and ensure spin fairness.

[0049] The detention hole of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention is intended to solve such a problem, and the detention hole of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention can manufacture lyocell fibers with a Y-shaped cross-section by adjusting the design of the detention hole (100) provided in the detention device (10) as shown in FIG. 2. In addition, the lyocell fiber according to an embodiment of the present invention can be manufactured through the detention hole (100) provided in the detention device (10).

[0050] Referring to FIGS. 1 and 2, the detention hole (100) of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention may be provided on the lower surface of the detention device (10), and a plurality of the detention holes (100) may be provided on the lower surface of the detention device (10). A plurality of the detention holes (100) may be provided in a certain arrangement on the lower surface of the detention device (10).

[0051] Referring to FIG. 2, the detention hole (100) of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention includes a plurality of slit holes (110).

[0052] The above slit hole (110) is provided on the lower surface of the detention device (10) through which dope is radiated, and extends in the longitudinal direction. A plurality of the slit holes (110) may be provided, and a single detention hole (100) can be formed through a plurality of the slit holes (110).

[0053] According to an embodiment of the present invention, at least three slit holes (110) may be provided in one detention hole (100), and it is preferable that three slit holes (110) are provided in one detention hole (100) to form a Y-shaped cross-section.

[0054] Referring to FIG. 2, a plurality of the slit holes (110) can be connected to each other at the center point (120). Specifically, when three slit holes (110) are provided in one of the detention holes (100), the three slit holes (110) can be connected to each other at the center point (120).

[0055] Referring to FIG. 2, the slit hole (110) according to an embodiment of the present invention may be provided with a step extension portion (130) that extends outward along the width direction at any point between the center point (120) and the end of the slit hole (110).

[0056] The above-mentioned step expansion portion (130) may be a point at which the width of the slit hole (110) is expanded at any point between the center point (120) and the end of the slit hole (110). The above-mentioned step expansion portion (130) may be a portion that extends outward along the width direction from a specific point of the slit hole (110).

[0057] Referring to FIG. 2, the single-jaw extension (130) extends outward along the width direction, but can extend in a direction perpendicular to the length direction of the slit hole (110).

[0058] Specifically, the step expansion portion (130) according to an embodiment of the present invention may extend perpendicularly to the direction in which the slit hole (110) extends. The step expansion portion (130) according to an embodiment of the present invention may extend perpendicularly while forming a 90-degree angle to the direction in which the slit hole (110) extends.

[0059] In addition, the step expansion portion (130) according to an embodiment of the present invention may extend in a diagonal direction with respect to the direction in which the slit hole (110) extends. The step expansion portion (130) according to an embodiment of the present invention may extend in a tapered shape or at a gentle angle with respect to the direction in which the slit hole (110) extends.

[0060] In addition, the step expansion portion (130) according to an embodiment of the present invention may be formed in any one shape among a straight line, a curved line, a combination of straight lines, and a combination of curved lines. The step expansion portion (130) may be formed in a straight line or a curved line. In addition, as needed, the step expansion portion (130) may be formed in any one shape among a combination of straight lines, a combination of curved lines, and a combination of straight lines and curved lines.

[0061] In this way, the single-step expansion portion (130) according to the embodiment of the present invention can be formed in various shapes, and can be formed in various shapes if it extends to the outside of the slit hole (110).

[0062] The above-mentioned step expansion part (130) may be a point at which the width of the slit hole (110) is expanded at any point between the center point (120) and the end of the slit hole (110), and as the step expansion part (130) is provided in the slit hole (110), the area of ​​the end of the slit hole (110) can be expanded.

[0063] The detention hole of the detention device for manufacturing lyocell fibers according to an embodiment of the present invention is provided with the step expansion portion (130) in the slit hole (110), so that the dope can be concentrated in the center of the slit hole, preventing the cross-section of the lyocell fibers from being formed into a triangular cross-section.

[0064] Specifically, if the detention hole is not provided with a step expansion portion as in Fig. 3 and is only composed of a Y-shaped detention hole (40), when dope is radiated, the dope is concentrated at the center point where the three slit holes meet, so that the amount of dope discharged increases, and accordingly, the space between adjacent slit holes is filled with dope, so that the cross-section of the radiated lyocell fiber forms a triangular cross-section.

[0065] If the cross-section of the radiated lyocell fibers forms a triangular cross-section as shown in Fig. 3, it becomes impossible to implement a Y-shaped cross-section with high sharpness. If the cross-section of the radiated lyocell fibers forms a triangular cross-section, the specific surface area may be smaller than that of the Y-shaped cross-section, which may result in poor cigarette filter suction resistance properties.

[0066] In order to solve this problem, the detention hole of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention may be provided with the step expansion part (130) in the slit hole (110).

[0067] The detention hole of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention has the step expansion part (130) in the slit hole (110), thereby increasing the area of ​​the end of the slit hole (110), thereby preventing the dope from being concentrated at the center point (120) where three slit holes (110) are connected.

[0068] The detention hole of the detention device for manufacturing lyocell fiber according to an embodiment of the present invention is provided with the step expansion part (130) in the slit hole (110) so that the area of ​​the end of the slit hole (110) is expanded, thereby evenly distributing the dope flow rate to the end of the slit hole (110), thereby enabling a clear Y-shaped cross-section to be implemented.

[0069] According to an embodiment of the present invention, the slit hole (110) may be provided with one of the step expansion portions (130). However, the present invention is not limited thereto, and the slit hole (110) according to an embodiment of the present invention may be provided with at least one step expansion portion (130).

[0070] Referring to FIG. 2, the slit hole (110) according to an embodiment of the present invention may include a second slit hole (112) extending in the longitudinal direction while forming a second width (W2) from the center point (120), and a first slit hole (111) connected to the second slit hole (112) and extending in the longitudinal direction while forming a first width (W1). The step expansion part (130) according to an embodiment of the present invention may be provided at a point where the first slit hole (111) and the second slit hole (112) are connected.

[0071] According to an embodiment of the present invention, the first width (W1) may be formed to have a larger value than the second width (W2). The first width (W1) may be formed to have a larger value than the second width (W2), and the slit hole (110) may extend to the second width (W2) and then expand to the first width (W1) while passing through the step expansion portion (130). This allows the area of ​​the end of the slit hole (110) to be expanded, thereby enabling the dope flow rate to be evenly distributed to the end of the slit hole (110).

[0072] According to an embodiment of the present invention, the second slit hole (112) may be extended to a second length (L2), and the first slit hole (111) may be extended to a first length (L1).

[0073] When spinning dope through a Y-shaped spinneret hole (100) according to an embodiment of the present invention, considering spinning stability, the smaller the hole area of ​​the Y-shaped spinneret hole, the better. Specifically, the smaller the hole area of ​​the Y-shaped spinneret hole, the lower the stretching ratio (spinning draft) in the spinning air gap to adjust the fiber fineness. According to an embodiment of the present invention, the hole area of ​​the Y-shaped spinneret hole can be adjusted through the width and length of the slit hole (110).

[0074] According to an embodiment of the present invention, the sum (L = L1 + L2) of the second length (L2) and the first length (L1) may be 0.2 mm to 0.57 mm. Referring to FIG. 4, if the length (L) of the slit hole (110), which is the sum of the second length (L2) of the second slit hole (112) and the first length (L1) of the first slit hole (111), is less than 0.2 mm, it may be difficult to implement a Y-shaped cross-section.

[0075] Referring to FIG. 4, when the length (L) of the slit hole (110), which is the sum of the second length (L2) and the first length (L1), becomes too small (L becomes smaller than 0.2 mm), even when dope is radiated through the detention hole (100), a Y-shaped cross-section cannot be formed, but a triangular cross-section may be formed.

[0076] According to an embodiment of the present invention, as the length (L) of the slit hole (110), which is the sum of the second length (L2) and the first length (L1), increases, the sharpness of the Y-shaped cross-section increases, so that a clear Y-shaped cross-section can be obtained.

[0077] Specifically, as shown in FIGS. 5, 6, 7, and 8, the longer the length of the slit hole (110), which is the sum of the second length (L2) and the first length (L1), the greater the clarity of the Y-shaped cross-section. However, if the length (L) of the slit hole (110), which is the sum of the second length (L2) and the first length (L1), becomes too large (L becomes larger than 0.57 mm), the radiation stability may deteriorate as the hole area of ​​the Y-shaped detention hole increases.

[0078] Therefore, it is preferable that the sum (L = L1 + L2) of the second length (L2) and the first length (L1) according to an embodiment of the present invention is 0.2 mm to 0.57 mm as shown in FIGS. 5, 6, 7, and 8.

[0079] According to an embodiment of the present invention, the second length (L2) may be formed to have a value greater than the first length (L1), the first length (L1) may be formed to be 0.09 mm to 0.15 mm, and the second length (L2) may be formed to be 0.11 mm to 0.42 mm.

[0080] Specifically, the sum (L = L1 + L2) of the second length (L2) and the first length (L1) may be 0.2 mm to 0.57 mm, while the first length (L1) may be 0.09 mm to 0.15 mm, and the second length (L2) may be 0.11 mm to 0.42 mm.

[0081] According to an embodiment of the present invention, the value of the first width (W1) with respect to the second width (W2) may be 1.25 to 1.75. Referring to FIG. 4, if the value of the first width (W1) of the first slit hole (111) with respect to the second width (W2) of the second slit hole (112) is too small (if the value of the first width (W1) with respect to the second width (W2) is less than 1.25), it may be difficult to implement a Y-shaped cross-section.

[0082] Specifically, if the value of the first width (W1) of the first slit hole (111) relative to the second width (W2) of the second slit hole (112) is less than 1.25, there is a risk that the dope will be concentrated toward the center point (120) as shown in FIG. 3, thereby forming a triangular cross-section.

[0083] In addition, if the value of the first width (W1) of the first slit hole (111) relative to the second width (W2) of the second slit hole (112) is too large (if the value of the first width (W1) relative to the second width (W2) is greater than 1.75), the radiation stability may deteriorate as the hole area of ​​the Y-shaped detention hole increases.

[0084] Specifically, if the value of the first width (W1) of the first slit hole (111) with respect to the second width (W2) of the second slit hole (112) is greater than 1.75, the end area of ​​the slit hole (110) may relatively increase, thereby increasing the hole area of ​​the Y-shaped detention hole, and thus, the radiation stability may deteriorate. Therefore, the value of the first width (W1) with respect to the second width (W2) according to the embodiment of the present invention is preferably 1.25 to 1.75, as shown in FIGS. 5, 6, 7, and 8.

[0085] According to an embodiment of the present invention, the first width (W1) may be 0.03 mm to 0.07 mm, and the second width (W2) may be 0.02 mm to 0.05 mm. Specifically, the value of the first width (W1) with respect to the second width (W2) may be 1.25 to 1.75, and the first width (W1) may be 0.03 mm to 0.07 mm, and the second width (W2) may be 0.02 mm to 0.05 mm.

[0086] According to an embodiment of the present invention, in order to improve the sharpness of the Y-shaped cross-section while improving the radiation stability, it is preferable that the value of the first width (W1) with respect to the second width (W2) is 1.25 to 1.75, and the sum (L = L1 + L2) of the second length (L2) and the first length (L1) is 0.2 mm to 0.57 mm.

[0087] According to an embodiment of the present invention, the second length (L2) may be configured to have a value greater than the first length (L1). In this case, the value of the first length (L1) relative to the sum (L) of the second length (L2) and the first length (L1) may be configured to be 0.22 to 0.45.

[0088] As the value of the first length (L1) relative to the sum (L) of the second length (L2) and the first length (L1) is 0.22 to 0.45, the sharpness of the Y-shaped cross-section increases as shown in FIGS. 5, 6, 7, and 8, thereby obtaining a clear Y-shaped cross-section. In addition, as the hole area of ​​the Y-shaped detention hole increases, it is possible to prevent the radiation stability from deteriorating.

[0089] According to an embodiment of the present invention, the end of the slit hole (110) may be formed into a round shape. By forming the end of the slit hole (110) into a round shape, the dope can be evenly distributed to the end of the slit hole (110). However, this is not limited thereto, and the end of the slit hole (110) may be formed into various shapes.

[0090] FIG. 9 is a drawing showing the step extension portion (130) that extends diagonally with respect to the direction in which the slit hole (110) extends according to an embodiment of the present invention. The step extension portion (130) according to an embodiment of the present invention may extend perpendicularly to the direction in which the slit hole (110) extends, as in FIG. 2, or may extend perpendicularly to the direction in which the slit hole (110) extends, as in FIG. 9.

[0091] Fig. 10 is a drawing showing the step extension portion (130) that extends while forming a step shape according to an embodiment of the present invention. The step extension portion (130) may include a vertical extension portion (131) that extends perpendicularly to the direction in which the slit hole (110) extends.

[0092] Referring to Fig. 10, the step extension portion (130) may include a plurality of the vertical extension portions (131) and a first connecting portion (132) connecting two of the vertical extension portions (131). The first connecting portion (132) may connect two of the vertical extension portions (131) while extending in a direction parallel to the direction in which the slit hole (110) extends. The step extension portion (130) may extend while forming a step shape through two or more of the vertical extension portions (131) and the first connecting portion (132).

[0093] Referring to Fig. 11, the step extension portion (130) may include a diagonal extension portion (133) extending diagonally with respect to the direction in which the slit hole (110) extends. The step extension portion (130) may include a plurality of the diagonal extension portions (133) and a second connecting portion (134) connecting two of the diagonal extension portions (133).

[0094] The second connecting portion (134) can connect two diagonal extension portions (133) while extending in a direction parallel to the direction in which the slit hole (110) extends. Referring to Fig. 11, the step extension portion (130) can be expanded in width through two or more diagonal extension portions (133) and the second connecting portion (134).

[0095] According to an embodiment of the present invention, the slopes at which the two diagonal extensions (133) extend diagonally may be the same. Furthermore, according to an embodiment of the present invention, the slopes at which the two diagonal extensions (133) extend diagonally may be formed differently.

[0096] The step expansion portion (130) according to an embodiment of the present invention can be formed in various shapes to increase the area of ​​the end of the slit hole (110), thereby implementing a wide range of fineness and Y-shaped cross-section, thereby securing the spinning fairness and improving the sharpness of the Y-shaped cross-section of the spun lyocell fiber.

[0097] Lyocell fibers according to an embodiment of the present invention can be manufactured through the detention hole (100) of the above-described detention device. The detention hole of the detention device used when manufacturing the lyocell fibers according to an embodiment of the present invention can have all the characteristics of the detention hole (100) of the above-described detention device.

[0098] The detention hole and lyocell fiber of the detention device for manufacturing lyocell fiber according to the embodiment of the present invention described above have the following effects.

[0099] The lyocell fiber and the lyocell hole of the lyocell fiber manufacturing device according to an embodiment of the present invention have a step expansion portion in the slit hole, thereby increasing the area of ​​the end of the slit hole, thereby suppressing the dope from being concentrated in the center of the slit hole and evenly distributing the dope to the end of the slit hole, thereby having the advantage of being able to manufacture a lyocell fiber with a Y-shaped cross-section.

[0100] The lyocell fiber and the lyocell hole of the lyocell fiber manufacturing device according to an embodiment of the present invention have a step expansion portion in the slit hole, thereby widening the area of ​​the end of the slit hole, thereby implementing a wide range of fineness and a Y-shaped cross-section, thereby ensuring spinning fairness, and have the advantage of improving the sharpness of the spun Y-shaped lyocell dope.

[0101] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and variations of the embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A spinneret opening of a spinneret device for producing lyocell fiber, containing a plurality of slotted holes formed in the spinning unit of the spinneret device providing spinning of the spinning solution and extending in the longitudinal direction, wherein the plurality of slotted holes are connected to each other at a central point, wherein each of the plurality of slit openings contains a stepped projection projecting outward in the direction of the width of the slot opening at a point between the center point and the end of each of the slot openings, and each of the plurality of slot openings comprises at least one stepped protrusion.

2. The spinneret opening according to claim 1, wherein the plurality of slot openings are formed in the form of at least three slot openings.

3. A spinneret opening according to any one of claims 1 and 2, in which the stepped projection projects at a right angle relative to the direction in which the slot openings extend.

4. A spinneret opening according to any one of claims 1 to 3, wherein the stepped projection projects in an inclined direction relative to the direction in which the slot openings extend.

5. A spinneret opening according to any one of claims 1 to 4, wherein the stepped projection has one shape selected from a rectilinear shape, a curved shape, a combination of rectilinear shapes, a combination of curved shapes, and a combination of rectilinear and curved shapes.

6. A spinneret opening according to any one of paragraphs 1-5, in which the plurality of slot openings include: a second slot opening extending in the longitudinal direction and having a second width (W2) at the central point, and a first slot opening connected to the second slot opening and extending in the longitudinal direction to form a first width (W1), wherein the stepped protrusion is formed at the junction of the first slot opening and the second slot opening.

7. A spinneret hole according to any one of paragraphs 1-6, in which the first width (W1) is greater than the second width (W2).

8. A spinneret hole according to any one of claims 1 to 7, wherein the ratio of the first width (W1) to the second width (W2) is from 1.25 to 1.

75.

9. A spinneret hole according to any one of claims 1 to 8, wherein the first width (W1) is from 0.03 mm to 0.07 mm, and the second width (W2) is from 0.02 mm to 0.06 mm.

10. A spinneret opening according to any one of paragraphs 1-9, in which the second slot opening has a second length (L2), the first slot opening has a first length (L1), wherein the sum of the second length (L2) and the first length (L1) is from 0.2 mm to 0.57 mm.

11. A spinneret hole according to any one of paragraphs 1-10, in which the second length (L2) is greater than the first length (L1).

12. A spinneret hole according to any one of claims 1 to 11, wherein the first length (L1) is from 0.09 mm to 0.15 mm, and the second length (L2) is from 0.11 mm to 0.42 mm.

13. A spinneret hole according to any one of claims 1 to 12, wherein the ratio of the first length (L1) to the sum of the second length (L2) and the first length (L1) is from 0.22 to 0.

45.

14. A spinneret opening according to any one of claims 1-13, wherein the end of each of the plurality of slot openings has a rounded shape.

15. Lyocell fiber obtained using a spinneret opening of a spinneret device according to any one of paragraphs 1-14.