Method for manufacturing composite fibers and composite spinneret

Abstract

To provide composite fibers capable of forming various fiber cross-sectional shapes with high precision and maintaining high dimensional stability of such cross-sectional shapes, a composite fiber manufacturing method involves distributing a sea-based polymer and at least one other polymer different from the sea-based polymer using a distribution plate (3). The sea-based polymer and the other polymer distributed by the distribution plate (3) are discharged from the sea-based discharge hole (2) and other component discharge holes (1) of a discharge plate (4) located downstream of the distribution plate (3) relative to the polymer spinning path direction, thereby forming a composite polymer flow. At least one composite polymer is produced and discharged from the discharge hole (16) of the spinneret discharge plate (5) located downstream of the discharge plate (4) relative to the polymer spinning path direction. In the discharge surface (23) of the discharge plate (4), corresponding to the composite polymer, at least one group of holes is formed, which is arranged with a plurality of sea component discharge holes (2) surrounding one or more of the other component discharge holes (1). In the group of holes, if the circle with the smallest diameter that includes all the other component discharge holes (1) on the inner side is set as an imaginary circle (14), the total discharge amount Q of the sea component polymer discharged from all the sea component discharge holes (2) arranged in the outer region of the imaginary circle (14) is Q. out The total discharge amount Q of the marine component polymer discharged from all the marine component discharge holes (2) disposed in the inner region of the above-mentioned imaginary circle (14) is Q. in Satisfying Q out / Q in ≥0.5.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing composite fibers composed of two or more polymers, and a composite spinneret for the manufacturing method. Background Technology

[0002] Among the methods for manufacturing composite fibers, there are composite spinning methods utilizing composite spinnerets such as core-sheath, parallel, and island-type spinnerets, and polymer alloying methods that involve melting and mixing polymers together. Regarding composite spinning, the principle of producing composite fibers from two or more polymers is no different from polymer alloying. However, composite spinning is considered superior to polymer alloying in that it precisely controls the flow of the composite polymer through the composite spinneret, particularly in forming a high-precision filament cross-sectional shape in the direction of filament travel.

[0003] As an example of composite spinning, the core-sheath type, by coating the core component with the sheath component, can impart sensory effects such as texture and bulkiness, as well as mechanical properties such as strength, elastic modulus, and abrasion resistance, which are impossible to achieve with individual fibers. Regarding the side-by-side type, it can exhibit crimp properties that are impossible to achieve with individual fibers, thus imparting elasticity and other properties. Furthermore, regarding the island-in-the-sea type, by subsequently dissolving the easily soluble component (sea component) from the melt-spun composite fiber, it is possible to obtain extremely fine fibers, for example, with a filament diameter at the nanometer level, leaving only the difficult-to-dissolve component (island component). These extremely fine fibers, due to their large surface area, offer excellent skin feel and drape, and are widely used as constituent materials for nonwoven fabrics and textiles. Moreover, especially in recent years, the requirements for the required filament cross-sectional shape have become very strict. For example, in the case of core-sheath type, a cross-section with high roundness of the core component is required. In the case of parallel type, a cross-section with one polymer very thinly wrapping another polymer in an off-center parallel configuration is required. In the case of island type, a cross-section with high roundness of the island component, a cross-section with high configuration accuracy between the island components, and a cross-section with multiple islands and very complex shapes is required, and so on.

[0004] Here, as a method for manufacturing composite fibers using a composite spinning method, the following method can be cited as an example. First, polymers are produced by extruding fragments corresponding to each component using an extruder. These polymers are then introduced into a spinning assembly through polymer piping located within a heating chamber. Next, impurities are removed by passing each component polymer through a filter media located within the spinning assembly, and the polymers are distributed using a perforated plate. Then, the polymer components are combined using a spinneret to form a composite polymer stream, which is discharged from the outlet of the spinneret to form composite fibers. In such a method for manufacturing composite fibers using a spinneret, determining the cross-sectional shape of the filament is crucial, and various methods have been specifically proposed.

[0005] For example, Patent Document 1 discloses a method for manufacturing core-sheath type composite fibers. In a composite spinneret that simultaneously discharges multiple core-sheath fibers, the flow rate of polymer discharged from the outermost discharge hole is set to 1 / 2 relative to the flow rate of polymer discharged from discharge holes in other regions. This homogenizes the discharge amount from the outermost discharge hole, thereby improving the co-core properties of the core-sheath. It also discloses that this method can be applied to parallel-type composite fibers.

[0006] Furthermore, Patent Document 2 discloses a method for manufacturing a composite fiber with a multilayered structure containing two polymers in a single flat fiber cross-section. This method improves the uniformity of the multilayered structure by supplying 0 to 30% of the polymer flow rate to both ends of the flat fiber cross-section located at the outermost layer of the multilayered structure along its length, relative to the total flow rate of the polymer flowing into the multilayered section.

[0007] Furthermore, while Patent Document 3 does not describe a detailed pattern of the discharge orifice arrangement, it discloses a composite spinneret for manufacturing island-type composite fibers with various island shapes. Regarding this spinneret, it describes how, by concentrating multiple island component discharge orifices of the island component polymer in an arbitrary shape, the island component polymers are made to merge, thereby enabling the island shape to be formed into an arbitrary cross-sectional shape. It discloses that, for example, fibers with island components having a complex cross-section (star-shaped) in a single composite fiber can be obtained.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 4-222205

[0011] Patent Document 2: Japanese Patent Application Publication No. 2010-203005

[0012] Patent Document 3: Japanese Patent Application Publication No. 2011-208313 Summary of the Invention

[0013] The problem that the invention aims to solve

[0014] However, conventional methods for manufacturing composite fibers have the following problems. Patent Document 1 describes methods to improve the uniformity of composite fibers discharged from discharge holes located on the outermost periphery of the composite spinneret, but does not describe techniques for improving the cross-sectional uniformity of composite fibers discharged from discharge holes located on the inner side of the spinneret. According to the inventors of this application, the method described in Patent Document 1 sometimes results in deteriorated cross-sectional uniformity of composite fibers discharged from discharge holes on the inner side of the composite spinneret due to factors such as the arrangement of the discharge holes, polymer properties (viscosity, viscosity difference), and polymer discharge volume. For core-sheath type fibers, a highly spherical cross-section is sometimes unattainable; and for side-by-side type fibers, a cross-section where the two polymers are uniformly bonded is sometimes unattainable. Especially when there are many composite fibers obtained from a composite spinneret (multiple filaments), or many islands configured in a single composite fiber (multiple islands), or islands configured in a single composite fiber with very complex shapes, or island components need to be configured with very high precision in a single composite fiber, the formation of the fiber cross section becomes very difficult in terms of ease of use, and therefore the technology disclosed in Patent Document 1 is sometimes not applicable.

[0015] In Patent Document 2, if the fiber cross-section is limited to a flat shape, the uniformity of the laminated portion can be improved. However, as far as the inventors of this application know, if the fiber cross-section is a general circle, when the polymer is supplied only to the outermost layer of the multilayer laminated portion, sometimes the flow rate of the polymer supplied in the direction perpendicular to the lamination direction of the multilayer laminated portion is insufficient, and the laminated cross-section is deformed in the direction perpendicular to the lamination direction, making it impossible to maintain the uniformity of the laminated portion.

[0016] Patent document 3 describes a method for forming an island shape by densely arranging multiple island component discharge holes, but it does not disclose the arrangement of the discharge holes for the sea component, which is the other polymer component. To the knowledge of the inventors of this application, for example, in order to form a star-shaped island with high precision, not only the island component polymer, but also the sea component polymer, sometimes flows to the outside of a single composite fiber if the sea component discharge holes are not properly arranged around the island component discharge holes to supply the sea component polymer, thus failing to form a star-shaped island.

[0017] As mentioned above, it is not enough to simply supply the island component polymer according to the desired island shape. Appropriately supplying the other ocean component polymer to the outer periphery of the island component polymer is an extremely important factor in manufacturing composite fibers with complex and high-precision island shapes. However, as mentioned above, there are still various problems, and solving these problems is of great industrial significance.

[0018] Therefore, the object of the present invention is to form a composite cross-sectional shape of a composite spinneret with high precision, and to provide a method for manufacturing composite fibers that can maintain the dimensional stability of the cross-sectional shape to a high degree, as well as a composite spinneret.

[0019] Methods for solving problems

[0020] The present invention, which solves the above-mentioned problems, adopts any of the following configurations.

[0021] (1) A method for manufacturing a composite fiber, wherein a sea-based polymer and at least one other polymer different from the sea-based polymer are dispensed using a dispensing plate; the sea-based polymer and the other polymer dispensed by the dispensing plate are respectively discharged from sea-based discharge holes and other component discharge holes of a discharge plate disposed downstream of the dispensing plate relative to the polymer spinning path direction to form at least one composite polymer; and the composite polymer is discharged from discharge holes of a spinneret discharge plate disposed downstream of the discharge plate relative to the polymer spinning path direction, wherein...

[0022] In the discharge surface of the discharge plate, corresponding to one of the composite polymers, at least one group of holes is formed by arranging a plurality of the marine component discharge holes around one or more of the other component discharge holes.

[0023] In the first group of orifices, if the circle with the smallest diameter that includes all the other component discharge orifices on its inner side is designated as an imaginary circle, the total discharge amount Q of the marine component polymer discharged from all the marine component discharge orifices located in the outer region of this imaginary circle is... out The total discharge amount Q of the marine component polymer discharged from all the marine component discharge holes disposed in the inner region of the imaginary circle. in Satisfying Q out / Q in ≥0.5.

[0024] (2) The method for manufacturing composite fibers according to claim 1, wherein, in the group of holes, the sum of the hole areas S of all the sea component discharge holes disposed in the inner region of the imaginary circle is S. in S is the sum of the orifice areas of all the sea component discharge holes located in the outer region of the imaginary circle. out Satisfy S in / S out ≥0.5.

[0025] (3) The method for manufacturing composite fiber according to (1) or (2) above, wherein, in the group of holes, the area of ​​one of the sea component discharge holes disposed in the outer region of the imaginary circle is greater than the area of ​​one of the sea component discharge holes disposed in the inner region of the imaginary circle.

[0026] (4) The method for manufacturing composite fiber according to any one of (1) to (3) above, wherein, in the group of holes, the amount of marine polymer discharged from one of the marine component discharge holes disposed in the outer region of the imaginary circle is greater than the amount of marine polymer discharged from one of the marine component discharge holes disposed in the inner region of the imaginary circle.

[0027] (5) A composite spinneret for discharging at least one composite polymer stream, said composite polymer stream being composed of a marine component polymer and at least one other component polymer different from the marine component polymer, wherein the composite spinneret has:

[0028] A dispensing plate for dispensing the marine component polymer and the other component polymers;

[0029] A discharge plate, disposed downstream of the distribution plate relative to the polymer spinning path direction, is formed with sea component discharge holes for discharging the sea component polymer and other component discharge holes for discharging the other component polymers; and

[0030] A spinneret discharge plate is disposed downstream of the discharge plate relative to the polymer spinning path direction and has discharge holes for discharging the composite polymer.

[0031] In the discharge surface of the discharge plate, corresponding to the one composite polymer flow, there is at least one group of holes arranged such that a plurality of marine component discharge holes surround one or more of the other component discharge holes.

[0032] In the first group of holes, if the circle with the smallest diameter that includes all the other component discharge holes on the inner side is set as an imaginary circle, the hole area of ​​one of the marine component discharge holes located in the outer region of the imaginary circle is greater than the hole area of ​​one of the marine component discharge holes located in the inner region of the imaginary circle.

[0033] Here, in this invention, the term "polymer spinning path direction" refers to the main direction in which each polymer component flows from the distribution plate to the spinneret discharge hole of the spinneret discharge plate.

[0034] In this invention, the term "discharge surface of the discharge plate" refers to the discharge surface facing the downstream side of the discharge plate relative to the direction of the polymer spinning path.

[0035] In this invention, the term "all sea component discharge holes disposed in the outer region of the imaginary circle" refers to all sea component discharge holes disposed in the outer region of the imaginary circle that includes the circumference of the imaginary circle.

[0036] In this invention, the term "all sea component discharge holes disposed in the inner region of the imaginary circle" refers to all sea component discharge holes disposed in the inner region of the imaginary circle, excluding the circumference of the imaginary circle.

[0037] In this invention, the terms "corresponding to one composite polymer" and "corresponding to one composite polymer flow" mean that the imaginary circle is assumed to correspond to the discharge orifice group of each composite polymer. Therefore, for example, in a composite spinneret, if four composite polymers or composite polymer flows are formed, four imaginary circles are assumed. However, typically in a single composite spinneret, since the sea component discharge orifice and other component discharge orifices are similarly arranged in each orifice group, the relationships within each orifice group are the same.

[0038] The effects of the invention

[0039] According to the method for manufacturing composite fibers and the composite spinneret of the present invention, a composite polymer flow is formed by supplying an appropriate amount of other component polymers to the outer periphery of the composite fiber while supplying other component polymers according to the desired shape. This enables the formation of various fiber cross-sectional shapes with high precision and maintains the dimensional stability of the cross-sectional shape to a high degree. Attached Figure Description

[0040] [ Figure 1 [Illustration] is a schematic cross-sectional view of the composite spinneret, spinning assembly, cooling device, and other peripheral equipment used in one embodiment of the present invention.

[0041] [ Figure 2 [Illustration 1] is a schematic cross-sectional view showing a composite spinneret according to an embodiment of the present invention.

[0042] [ Figure 3 ]yes Figure 2 The XX-direction view is an overall view of the discharge surface of the discharge plate.

[0043] [ Figure 4 [A schematic cross-sectional view of a representative composite fiber that can be manufactured by the present invention.]

[0044] [ Figure 5 [A schematic cross-sectional view of a composite fiber manufactured using existing methods.]

[0045] [ Figure 6 [This is a partially enlarged cross-sectional view of the discharge surface of the discharge plate used in the existing method.]

[0046] [ Figure 7 [ ] is a partially enlarged cross-sectional view of the discharge surface of the discharge plate used in this invention.

[0047] [ Figure 8 [ ] is a partially enlarged cross-sectional view of the discharge surface of the discharge plate used in this invention.

[0048] [ Figure 9 [ ] is a partially enlarged cross-sectional view of the discharge surface of the discharge plate used in this invention.

[0049] [ Figure 10 [ ] is a partially enlarged cross-sectional view of the discharge surface of the discharge plate used in this invention.

[0050] [ Figure 11 [ ] is a partially enlarged cross-sectional view of the discharge surface of the discharge plate used in this invention. Detailed Implementation

[0051] Hereinafter, embodiments of the method for manufacturing the composite fiber of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the accompanying drawings are simplified conceptual diagrams intended to accurately convey the key points of the present invention. Therefore, the manufacturing method and composite spinneret of the present invention are not particularly limited to the accompanying drawings, and the number of holes and slots, as well as their dimensional ratios, may be varied according to the embodiments.

[0052] like Figure 1 As shown, in the embodiments of the present invention, the composite spinneret 13 is installed inside the spinning assembly 21, and the spinning assembly 21 is fixed in the spinning box 12. Furthermore, a cooling device 25 is disposed directly below the composite spinneret 13.

[0053] like Figure 2 As shown, the composite spinneret 13 is constructed by sequentially stacking at least one distribution plate 3, a discharge plate 4, and a spinneret discharge plate 5. A marine polymer and at least one other polymer, different from the marine polymer, are introduced into the composite spinneret 13, passing through the distribution plate 3 and the discharge plate 4 respectively, and are discharged from the spinneret discharge hole 16 of the spinneret discharge plate 5 in a composite state. The composite polymer discharged from the spinneret discharge hole 16 is then cooled by an airflow blown from the cooling device 25, and after being coated with an oiling agent, it is wound as a composite fiber.

[0054] It should be noted that, Figure 1 While an annular cooling device 25 that blows air outwards in a circular pattern is used, a cooling device that blows air outwards in a unidirectional pattern can also be used. Furthermore, regarding the components mounted on the upstream side of the distribution plate 3, the flow path used in the existing spinning assembly 21 can be used, and no special proprietary design is required.

[0055] The discharge plate 4 is preferably made of a thin plate. The discharge plate 4 can also be positioned together with the distribution plate 3 and the spinneret discharge plate 5 by using positioning pins to match the center position (core) of the spinning assembly 21, and fixed by screws, bolts or the like after stacking, or metal-jointed by heat pressing.

[0056] After the polymers of each component supplied to the distribution plate 3 pass through the distribution groove 7 and distribution hole 6 of the distribution plate 3, which are stacked with at least one plate, they are discharged from the other component discharge hole 1 of the discharge plate 4 for discharging other component polymers and the sea component discharge hole 2 for discharging sea component polymers, respectively. Furthermore, in the merging hole 17, the other component polymers discharged from adjacent other component discharge holes 1 merge to form an island shape, and the sea component polymers discharged from adjacent sea component discharge holes 2 merge to form a composite polymer by surrounding other component polymers (island component polymers). Then, the composite polymer is discharged from the spinneret discharge hole 16 of the spinneret discharge plate 5 in the form of composite fibers. It should be noted that by discharging and merging the composite polymers discharged from the other component discharge holes 1 and the sea component discharge holes 2 (hereinafter sometimes collectively referred to as discharge holes 8) and then discharging them from the spinneret discharge hole 16, composite fibers are formed. In this invention, one composite polymer and one composite fiber can be formed from one composite spinneret, or multiple composite polymers and composite fibers can be formed. It should be noted that... Figure 3 This is a schematic diagram showing a discharge plate that can form four composite fibers.

[0057] Here, the principle behind the ability to precisely form various fiber cross-sectional shapes is explained. For example, as... Figure 4 As shown in (a), in order to configure other component polymers (A) 18 into a radially expanding linear shape (hereinafter referred to as an island shape) in a single composite fiber 22, it is relatively easy to imagine that: in the discharge surface 23 of the discharge plate 4, a plurality of other component discharge holes 1 are arranged in an aggregate (hole group) to match the island shape, and marine component discharge holes 2 are arranged around the hole group. However, this alone cannot actually form an island shape identical to the target, as... Figure 5 As shown, this easily leads to a thickened, deformed tip on a linear body. For example, in areas where the island shape becomes more complex (equivalent to...). Figure 4 In the central part of the composite fiber shown in (a), a large number of marine component discharge holes 2 need to be finely arranged, and the marine component polymer is pre-divided by a distribution plate 3 and discharged from each marine component discharge hole 2 to form an island shape. Figure 6In the existing discharge plate 4 shown, in order to obtain a certain number of composite fibers from a spinneret of a specified size, it is sometimes impossible to sufficiently ensure the area (the area further outward than the other component discharge holes 1) configured for the outer periphery of the composite fiber 22. In this case, the flow rate of the marine component polymer that can be supplied to the outer periphery of the other component polymer (A) is reduced, resulting in a significant deflection of the composite polymer downstream of the discharge surface 23, causing island-shaped deformation. That is, it becomes very difficult to precisely control the island shape of the composite fiber simply by surrounding the group of holes of the other component discharge holes 1 with the marine component discharge holes 2. It should be noted that although there are methods to increase the size of the discharge plate 4 and increase the area configured with the marine component discharge holes 2, the size of the discharge plate 4 affects the size of the composite spinneret 13 and even the spinning assembly 21, so the number of marine component discharge holes 2 that can ultimately be configured on the discharge plate 4 is limited.

[0058] Therefore, the arrangement of the marine component discharge holes 2 on the discharge surface 23 according to the desired island shape of the composite fiber, and the supply of an appropriate amount of marine component polymer to the outer periphery of other component polymers to form a composite polymer flow, is an extremely important technique in the manufacture of composite fibers. The inventors of this application conducted repeated and in-depth research on the aforementioned problems, which had not been considered in the prior art, and as a result discovered the new technology of this invention.

[0059] In this invention, such as Figure 7 As shown, on the discharge surface 23 of the discharge plate 4, a group of holes is provided corresponding to each composite polymer flow, consisting of multiple marine component discharge holes 2 surrounding one or more other component discharge holes 1. Furthermore, in each group of holes, let Q be the total discharge amount [g / min] of the marine component polymer discharged from all marine component discharge holes 2 arranged in the outer region of the imaginary circle 14, assuming a circle with the smallest diameter that includes all other component discharge holes 1 on its inner side. out Let Q be the total discharge rate [g / min] of all marine component polymers discharged from the discharge holes 2 located in the inner region of the imaginary circle 14. in When, let's assume that Q is satisfied. out / Q in ≥0.5. This controls polymer discharge, specifically for areas with complex island shapes (…). Figure 4 In (a) of the composite fiber, the necessary amount of marine polymer is supplied to the inner region of the imaginary circle 14 (the central part of the composite fiber), and an amount of marine polymer equivalent to more than half of the total discharge amount of marine polymer supplied to the inner region is supplied to the outer region of the imaginary circle 14. This suppresses the island shape on the inner side of the imaginary circle 14 from deflecting to the outer periphery. As a result, the outer periphery of the composite fiber can be formed and a good island shape can be obtained. That is, it is possible to obtain... Figure 4The cross-section of the highly complex composite fiber 22 is shown in (a) above. It should be noted that Q... out / Q in When the value is less than 0.5, the amount of marine polymer supplied to the outer region of the imaginary circle 14 is small, that is, the flow rate of marine polymer supplied to the outer periphery of the composite fiber is small, so it is difficult to sufficiently suppress the deformation of the island shape.

[0060] Furthermore, by increasing the total discharge Q of marine component polymers supplied to the outer region of the imaginary circle 14 out Let Q be the total discharge of marine component polymers supplied to the inner side. in Above (Q out / Q in ≥1), thereby stabilizing the island shape and achieving a better island shape. In particular, such as Figure 3 As shown, because the outer periphery of the orifice group 8 (a concept encompassing the other component orifice 1 and the marine component orifice 2) is close to the wall of the spinneret discharge plate 5, the composite polymer is easily subjected to shear forces, and the island shape is prone to disorder. Therefore, by increasing the marine component polymer in the outer region of the imaginary circle 14, the island shape can be stabilized. On the other hand, Q out / Q in A value below 8 is appropriate. By making Q... out / Q in With a value of 8 or less, the amount of marine polymer supplied to the inner region of the imaginary circle 14 can be sufficiently ensured, that is, the amount of marine polymer in the inner periphery of the composite fiber is sufficient, thereby more reliably preventing minor deformation of the island shape.

[0061] Furthermore, for each group of holes, it is preferable that the sum of the hole areas S of all the marine component discharge holes 2 disposed in the inner region of the imaginary circle 14 in the discharge surface 23 of the discharge plate 4 is S. in The sum of the area S of all sea component discharge holes 2 located in the outer region of the imaginary circle 14 and the total area S of the discharge holes 2. out Satisfy S in / S out ≥0.5. This increases the flow rate of the marine component polymer discharged from the marine component discharge hole 2 located in the inner region of the imaginary circle 14, thereby further stabilizing the cross-section of the composite fiber 22. It should be noted that S in / S out More preferably, it is 0.75 or higher. Furthermore, S in / S outThere is no specific upper limit for the ratio; it can be set within a practical range. However, the larger the ratio, the more stable the island shape. On the other hand, the fewer sea component discharge holes 2 can be arranged on the outer side of the imaginary circle 14. Therefore, from the viewpoint of ensuring the flow rate of sea component polymer supplied to the outer periphery of the composite fiber and forming an island shape, it is preferable that S... in / S out A value of 3 or below is appropriate.

[0062] In each group of holes, such as Figure 8 As shown, the orifice area Sa of one marine component discharge hole 2 preferably located in the outer region of the imaginary circle 14 is... out The area Sa of one marine component discharge hole 2 located in the inner region of the imaginary circle 14 is greater than that of the other. in In this invention, since the flow rate of the marine component polymer discharged from the marine component discharge hole 2 located in the outer region of the imaginary circle 14 is more than half the flow rate of the marine component polymer discharged from the marine component discharge hole 2 located in the inner region of the imaginary circle 14, the pressure loss in the marine component discharge hole 2 located in the outer region becomes larger. However, by pre-increasing the orifice area Sa of the marine component discharge hole 2 located in the outer region... out This reduces pressure loss. Furthermore, it reduces the velocity difference of the polymer discharged from the sea component discharge holes 2 located on the outer and inner sides, thus further suppressing and stabilizing the island shape over time.

[0063] It should be noted that when the orifice areas of the various marine component discharge holes 2 located in the outer region of the imaginary circle 14 are different, it is sufficient to set the average orifice area of ​​each marine component discharge hole 2 as the orifice area Sa of one marine component discharge hole 2. out That's fine. The same applies even when the areas of the discharge holes 2 for each marine component located in the inner region of the imaginary circle 14 are different.

[0064] Furthermore, in each group of holes, preferably in the discharge surface 23 of the discharge plate 4, the discharge amount Qa of the marine component polymer discharged from one marine component discharge hole 2 located in the outer region of the imaginary circle 14 is [missing information]. out The discharge amount Qa of the marine component polymer is greater than that discharged from one marine component discharge hole 2 located in the inner region of the imaginary circle 14. inThis allows for a reduction in the number of marine component discharge holes 2 located on the outer region of the imaginary circle 14, an increase in the number of marine component discharge holes 2 located on the inner region of the imaginary circle 14, and further an increase in the number of other component discharge holes 1, thus enabling the formation of a more complex island-shaped composite fiber cross-section. It should be noted that when the discharge amounts of marine component polymers from each marine component discharge hole 2 located on the outer region of the imaginary circle 14 are different, the average value of the marine component polymers discharged from each marine component discharge hole 2 can be set as the discharge amount Qa from one marine component discharge hole 2. out That is, the same applies when the amount of marine component polymer discharged from each marine component discharge hole 2 located in the inner region of the imaginary circle 14 is different from each other.

[0065] Below, based on Figure 9 , Figure 10 , Figure 11 The discharge plate shown illustrates another embodiment of the present invention. Figure 9 It indicates that it is used for manufacturing. Figure 4 The diagram shows the hole configuration of the discharge surface 23 of the composite fiber (configured with multiple cross-shaped islands) in (b). Figure 10 It is used for manufacturing Figure 4 The perforation configuration of the discharge surface 23 of the composite fiber (where the other component polymers are composed of two polymers and are configured in multiple core-sheath type island shapes) in (c) is described. The perforation configuration of the present invention is not limited to this; it can also be a bimetallic perforation configuration where the island shape is formed. Furthermore, it can be a perforation configuration where the other component polymers are composed of three or more components (three-layered cross-sections). The present invention is particularly suitable when the island shape is complex and multiple discharge holes 1 for other components and discharge holes 2 for other components are required, enabling the formation of various fiber cross-sectional shapes with high precision.

[0066] also, Figure 11 It is used for manufacturing Figure 4 The composite fibers in (d) are configured with multiple cross-shaped islands, wherein, relative to Figure 4 Regarding the arrangement of island components in (a) to (c) of the composite fiber, this method involves arranging the sea component in the center of the composite fiber, specifically the perforation arrangement of the discharge surface 23. In this case, it is also set to satisfy Q. out / Q in ≥0.5, but in cases where, for example, the central region of the island is large and there is no island, in order to more reliably prevent the island from deflecting towards the center and outwards, it is preferable to set it as follows. That is, in the discharge surface 23 of the discharge plate 4, all other component discharge holes 1 are imagined to be the circle with the largest outer diameter, which is set as the second imaginary circle 24, and the total discharge amount of marine component polymers discharged from all marine component discharge holes 2 in the region sandwiched between the second imaginary circle 24 and the imaginary circle 14 is set as Q.in2 At that time, the total discharge amount Q of the marine component polymer discharged from all marine component discharge holes 2 located in the outer region of the imaginary circle 14 is such that... out Satisfying Q out / Q in2 ≥1.05. This is because the island shape of the composite fiber becomes complex in the region where... Figure 11 The area between the outer side of the second imaginary circle 24 and the inner side of the imaginary circle 14 in the discharge surface 23 requires that, while supplying the necessary flow of marine component polymer to this area, sufficient marine component polymer should also be supplied to other areas outside it to prevent the island shape from deviating towards the center and the outside.

[0067] Next, regarding... Figure 1 , Figure 2 The common components of the composite spinneret 13 of the present invention will be described in detail. The composite spinneret 13 of the present invention is not limited to a circle; it can be quadrilateral or polygonal. Furthermore, the arrangement of the spinneret discharge holes 16 in the composite spinneret 13 can be appropriately determined according to the number of multifilaments, the number of filaments, and the cooling device 25. When using an annular cooling device as the cooling device 25, the spinneret discharge holes 16 can be arranged in a single row or in multiple rows in a ring. Furthermore, in a cooling device that blows air from a single direction, the spinneret discharge holes 16 can be arranged in a grid or staggered manner. The cross-section of the spinneret discharge hole 16 in the direction perpendicular to the direction of the polymer spinning path is not limited to a circle; it can also be a cross-section other than a circle or a hollow cross-section. However, when the cross-section is other than a circle, it is preferable to increase the length of the spinneret discharge hole 16 to ensure polymer metering. Furthermore, regarding the other component discharge holes 1 and 2 in this invention, their cross-sections in the direction perpendicular to the direction of the polymer spinning path are not limited to circles; they can also be cross-sections other than circles or hollow cross-sections.

[0068] The confluence orifice 17 of the present invention preferably has a narrowing angle α of 50 to 120° for the flow path from the discharge surface 23 of the discharge plate 4 to the spinneret discharge orifice 16 of the spinneret discharge plate 5. This suppresses instability phenomena such as draw resonance in the composite polymer flow, resulting in a more stable supply of the composite polymer flow. Here, by setting the narrowing angle α to 50° or more, not only is instability in the composite polymer flow suppressed, but also the enlargement of the composite spinneret 13 is prevented. Furthermore, by setting the narrowing angle α to 120° or less, instability in the composite polymer flow can be prevented more reliably. In addition, the aperture of the confluence orifice 17 facing the discharge surface 23 of the discharge plate 4 is preferably configured such that it is larger than the outer diameter of the imaginary circle containing all the other component discharge orifices 1 and component discharge orifices 2 disposed on the discharge surface 23, and the ratio of the cross-sectional area of ​​this imaginary circle to the cross-sectional area of ​​the discharge orifice group is minimized. This suppresses the widening of each polymer discharged from the discharge surface 23, resulting in a more stable composite polymer flow.

[0069] In this invention, a single distribution plate 3 may be provided with only distribution holes 7 or only distribution grooves 8. Alternatively, it may be a distribution plate 3 with distribution holes 7 on the upstream side and distribution grooves 8 on the downstream side in communication with the upstream side; or a distribution plate 3 with distribution grooves 8 on the upstream side and distribution holes 7 on the downstream side in communication with the upstream side.

[0070] In this invention, by reducing the spacing of the other component discharge holes 1 of the discharge plate 4, the other component polymers discharged from adjacent other component discharge holes 1 (island component polymers) become more likely to merge without being obstructed by the sea component polymers, thereby improving the cross-sectional formation of the island shape. Furthermore, by reducing the spacing of the sea component discharge holes 2 of the discharge plate 4, the sea component polymers discharged from adjacent sea component discharge holes 2 become more likely to merge without being obstructed by other component polymers, allowing for precise control of the sea component polymers.

[0071] Below, based on Figures 1-3 , Figures 7-11 A detailed description will be given of a method for manufacturing composite fibers that is common to embodiments of the present invention.

[0072] The method for manufacturing the composite fiber of the present invention can be carried out, for example, using a composite spinneret 13 in a known composite spinning machine. For example, in the case of melt spinning, the spinning temperature is set to the temperature at which the high-melting-point, high-viscosity polymer among the two or more polymers exhibits fluidity. This fluidity-indicating temperature varies depending on the molecular weight, and the melting point of the polymer is used as a reference; it can be set below the melting point +60°C. Below this temperature, the polymer will not undergo thermal decomposition within the spinning box 12 or spinning assembly 21, thus suppressing molecular weight reduction, which is therefore preferable. The spinning speed varies depending on the physical properties of the polymer and the purpose of the composite fiber, and is approximately 1 to 6000 m / min.

[0073] In this invention, the discharge rate ratio of the polymers of each component discharged from the other component discharge hole 1 and the marine component discharge hole 2 is preferably controlled by the discharge volume, hole diameter, and number of holes. Here, the discharge rate refers to the value obtained by dividing the discharge flow rate by the cross-sectional area of ​​the other component discharge hole 1 or the marine component discharge hole 2. When the discharge rate of the other component polymer per single hole is set as Va and the discharge rate of the marine component polymer is set as Vb, their discharge rate ratio (Va / Vb or Vb / Va) is preferably 0.05 to 20, more preferably in the range of 0.1 to 10. If it is in such a range, the polymers discharged from the discharge plate 4 are stabilized, and the cross-sectional shape can be maintained with high precision.

[0074] Furthermore, the composite fiber obtained by the manufacturing method of the present invention refers to a fiber that combines two or more polymers, and specifically, a fiber in which two or more polymers exist in various island-shaped forms in the fiber cross-section. Needless to say, the two or more polymers mentioned in the present invention include two or more polymers with different molecular structures, such as polyester, polyamide, polyphenylene sulfide, polyolefin, polyethylene, and polypropylene. Within a range that does not impair the stability of the yarn production, various functional particles and organic compounds such as matting agents like titanium dioxide, silica, kaolin, anti-coloring agents, stabilizers, antioxidants, deodorizers, flame retardants, yarn friction reducers, coloring pigments, and surface modifiers can also be added. Multiple particles can be used in different amounts, or multiple particles with different molecular weights can be used. Substances copolymerized from these polymers can also be used.

[0075] Furthermore, the cross-section of the composite fiber obtained by the manufacturing method of the present invention can be not only circular, but also triangular, flat, or other non-circular shapes, or hollow shapes. Moreover, the present invention is highly versatile and is not limited by the fineness or number of single filaments of the composite fiber. It is also not limited by the number of filaments in the composite fiber; the number of filaments can be one or more than two filaments.

[0076] Furthermore, the composite fiber obtained by this invention, as described above, refers to a fiber in which two or more different polymers form various island shapes in a cross-section perpendicular to the fiber axis. In this case, the island shape is not limited and can be as follows: Figure 4 As shown in (a), it forms an island shape, or it can be like... Figure 4 (b) Figure 4 (c) Figure 4 As shown in (d), multiple island shapes are formed. Theoretically, the number of island shapes can be infinitely large within the space allowed by the discharge surface 23, but 2 to 10,000 islands are preferred as a practically feasible range. For obtaining the advantages of the method for manufacturing the composite fiber of the present invention, 100 to 10,000 islands are further preferred.

[0077] Furthermore, in this invention, the pore filling density (the value obtained by dividing the number of other component discharge pores 1 that discharge other component polymers by the maximum area of ​​the confluence pores 17) is preferably 0.1 pores / mm. 2 The higher the pore filling density value, the more island-shaped composite fibers with more complex cross-sections can be obtained. For example, if the pore filling density is 0.1 pores / mm... 2 The above further clarifies the differences from existing composite spinneret technology. Moreover, considering practical implementation feasibility, the orifice filling density is 1–20 orifices / mm. 2 This is a more preferred range.

[0078] This invention is not limited to its application in melt spinning, but can also be applied to wet spinning, wet-dry spinning, and dry spinning. In the case of wet spinning, the composite spinneret 13 is immersed in a coagulation bath. In the case of dry spinning, the composite spinneret 13 is positioned above the liquid surface in the coagulation bath.

[0079] As described above, in the manufacturing method of the composite fiber of the present invention, the cross-sectional shape of the island component can be arbitrarily controlled, and therefore it is not limited by the above-mentioned shapes, and can be made into free shapes. Moreover, the composite fiber obtained by the present invention can be made into multi-purpose fiber products such as fiber winding packages, tows, short fibers, cotton, fiber balls, ropes, pile, woven and knitted fabrics, non-woven fabrics, paper, and liquid dispersions.

[0080] Example

[0081] The following examples illustrate the effects of the composite fiber manufacturing method of the present invention. In each example and comparative example, the composite spinneret described later was used to spin the composite fiber, and the presence or absence of confluence of other polymer components and defects in the cross-section of the composite fiber were determined as follows. It should be noted that the diagram used in the description of the discharge holes on the discharge surface of the composite spinneret ( Figure 7 , Figure 9 , Figure 10 The diagram shows the arrangement of the holes, which may differ from the number of discharge holes used in the embodiments and comparative examples.

[0082] (1) Whether there is confluence of other polymer components

[0083] The spinning process begins with 24 hours of continuous spinning. The resulting composite fiber is then cut at any point along the fiber's axial direction. The cross-section of this fiber is imaged using a Keyence VE-7800 scanning electron microscope (SEM) at 3000x magnification. The number of islands in the composite fiber is measured. If the value of the number of islands divided by the number of other component discharge holes in the discharge surface of the discharge plate is 1, there is no confluence of other component polymers (island component polymers) between different hole groups. If the value is less than 1, there is confluence of other component polymers between different hole groups. It should be noted that if the discharge holes for sea components and other components in the composite spinneret are arranged in the same positional relationship, observation of the composite fiber obtained from one group of holes is sufficient.

[0084] (2) Poor cross-section of polymer with other components

[0085] The spinning process begins with 24 hours of continuous spinning. The resulting composite fiber is then cut at any point along the fiber's axial direction. The cross-section of this fiber is photographed using a Keyence VE-7800 scanning electron microscope (SEM) at 3000x magnification. If the island shape of the composite fiber is similar to the shape formed by the group of orifices surrounding the orifice group on the discharge surface of the discharge plate (the shape of the outline surrounding the orifice group), there is no cross-sectional defect. If the shape is dissimilar to the shape surrounding the orifice group, there is a cross-sectional defect. It should be noted that when the orifice groups in the composite spinneret are arranged with the same positional relationship between the sea element discharge holes and other component discharge holes, observation of the composite fiber obtained from one orifice group is sufficient.

[0086] (3) Melt viscosity of the polymer

[0087] The moisture content of the fragmented polymer was reduced to below 200 ppm using a vacuum dryer. The melt viscosity was measured using a Toyo Seiki "Capillograph 1B" laser with progressively varying strain rates. It should be noted that the measurement temperature was set to the same as the spinning temperature; in the examples or comparative examples, a value of 1216 s was recorded. -1 The melt viscosity. Additionally, the time from when the sample is placed in the heating furnace to the start of the measurement is set at 5 minutes, and the measurement is performed under a nitrogen atmosphere.

[0088] [Example 1]

[0089] Polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.65 as a component polymer and polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.59 as a component polymer are melted separately at 285°C. These molten polymers are then fed into a composite spinneret 13 equipped with the following... Figure 1 The apparatus shown discharges polymers of other components / marine components at a discharge ratio of 30 / 70. The discharged polymer is cooled using a cooling device 25, then oiled, interlaced, and hot-stretched. It is then wound onto a winding roller at a speed of 1500 m / min to collect unstretched fibers of 150 dtex-10 filament (single-hole discharge rate 2.25 g / min). The wound unstretched fibers are then stretched 2.5 times between rollers heated to 90°C and 130°C to collect composite fibers of 60 dtex-10 filament.

[0090] At the discharge surface 23 of the discharge plate 4 of the composite spinneret 13, such as Figure 7 As shown, in one group of holes, there are 65 other component discharge holes 1 arranged radially, 526 marine component discharge holes 2 arranged, 380 marine component discharge holes 2 located in the inner region of the imaginary circle 14, and 146 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0091] The spinning test showed no fiber cross-section defects.

[0092] [Example 2]

[0093] Except for the composite spinneret 13, the same polymer and spinning conditions as in Example 1 were used to collect composite fibers arranged in multiple cross-shaped islands.

[0094] At the discharge surface 23 of the discharge plate 4 of the composite spinneret 13, such as Figure 9 As shown, in one group of holes, there are 243 other component discharge holes 1 and 3840 marine component discharge holes 2. There are 2560 marine component discharge holes 2 located in the inner region of the imaginary circle 14 and 1280 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0095] In the spinning test, there were no confluences of other polymer components and no poor fiber cross-sections.

[0096] [Example 3]

[0097] Polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.65 as the first component of the polymer (hereinafter referred to as the first other component polymer), polyethylene terephthalate (PET) with an intrinsic viscosity [η] of 0.59 as the other component polymer, and PET copolymerized with 5.0 mol% sodium isophthalate-5-sulfonate (copolymer PET) with an intrinsic viscosity [η] of 0.58 as the second component of the polymer (hereinafter referred to as the second other component polymer) are melted at 285°C. These molten polymers are then fed to a composite spinneret 13 equipped with the following... Figure 1 The apparatus shown discharges the first other component polymer / second other component polymer / sea component polymer at a discharge ratio of 30 / 10 / 60. Otherwise, using the same spinning conditions as in Example 1, composite fibers arranged in an island shape with multiple core-sheath structures (core being the first other component polymer, sheath being the second other component polymer) are collected.

[0098] At the discharge surface 23 of the discharge plate 4 of the composite spinneret 13, such as Figure 10 As shown, in a group of holes, there are 44 first other component discharge holes 1', 353 second other component discharge holes 1'”, and 2790 marine component discharge holes 2. There are 2500 marine component discharge holes 2 located in the inner region of the imaginary circle 14 and 290 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0099] In the spinning test, there were no confluences of other polymer components and no poor fiber cross-sections.

[0100] [Example 4, Example 5]

[0101] The composite spinneret 13 was modified as follows, and the total discharge ratio of the marine component polymer was adjusted to be as shown in Table 1. Otherwise, the same polymer and spinning conditions as in Example 3 were used to collect composite fibers arranged in the shape of multiple islands with core-sheath structures (core is the first other component polymer and sheath is the second other component polymer).

[0102] At the discharge surface 23 of the composite spinneret 13, such as Figure 10 As shown, in one group of holes, there are 44 first other component discharge holes 11', 353 second other component discharge holes 1”, and 2790 marine component discharge holes 2. There are 2270 marine component discharge holes 2 located in the inner region of the imaginary circle 14 and 520 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0103] In Examples 4 and 5, there was no confluence of other polymer components and no fiber cross-section defects. However, although the island shapes were similar to the outline of the hole group surrounding the second other component discharge hole 1", in Example 5, the island shape with the core-sheath structure was slightly deformed into an elliptical shape compared to Example 4.

[0104] [Example 6, Example 7]

[0105] The composite spinneret 13 was modified as follows: the total discharge ratio of the marine component polymer was adjusted to the values ​​shown in Table 1. Otherwise, the same polymer and spinning conditions as in Example 2 were used to collect composite fibers arranged in multiple cross-shaped islands.

[0106] Examples 6 and 7 both involve the following: on the discharge surface 23 of the composite spinneret 13, such as... Figure 9 As shown, in one group of holes, there are 243 other component discharge holes 1 and 3840 marine component discharge holes 2. In Example 6, there are 3400 marine component discharge holes 2 located in the inner region of the imaginary circle 14 and 440 marine component discharge holes 2 located in the outer shape of the imaginary circle 14; in Example 7, there are 3600 marine component discharge holes 2 located in the inner region of the imaginary circle 14 and 240 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0107] In Examples 6 and 7, there was no confluence of other polymer components and no fiber cross-section defects. However, although the island shapes were similar to the outline of the hole group surrounding the discharge holes 1 of other components, the island shapes disposed on the outer periphery of the composite fiber were slightly deformed in Example 7 compared to Example 6.

[0108] [Comparative Example 1]

[0109] In addition to having Figure 6 Apart from the discharge surface 23 shown, the same composite spinneret 13 as in Example 1 is used for spinning, with the same polymer, the same fineness, and the same spinning conditions as in Example 1.

[0110] In the discharge surface 23, such as Figure 6 As shown, in one group of holes, there are 65 other component discharge holes 1 arranged radially, 526 marine component discharge holes 2 arranged, 421 marine component discharge holes 2 located in the inner region of the imaginary circle 14, and 105 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0111] In the spinning experiment, the result was a fiber with an undesirable cross-section. That is, regarding the obtained composite fiber, it became such that... Figure 5The composite fiber shown is a composite fiber in which the front end of the other component polymer filament is thickened, and a portion of the front end of the other component polymer filament is not covered by the sea component polymer.

[0112] [Comparative Example 2]

[0113] Except for having the following discharge surface 23, the same composite spinneret 13 as in Example 2 is used to spin the composite fibers arranged with multiple cross-shaped islands using the same polymer, the same fineness, and the same spinning conditions as in Example 2.

[0114] On the discharge surface 23, in a group of holes, there are 243 discharge holes 1 for other components and 3840 discharge holes 2 for marine components. There are 1920 marine component discharge holes 2 located in the inner region of the imaginary circle 14 and 1920 marine component discharge holes 2 located in the outer shape of the imaginary circle 14.

[0115] In the spinning test, the fiber cross-section was undesirable due to the confluence of other polymer components, resulting in the partial failure to form a cross-shaped island. That is, the other polymer linear bodies discharged from adjacent pore groups partially merged, the cross-shaped island shape became flat, and even the lengths of the linear bodies on the four sides constituting the cross-shaped island shape became uneven.

[0116] The results of each embodiment and comparative example are summarized in Table 1 and Table 2.

[0117] [Table 1]

[0118]

[0119] [Table 2]

[0120]

[0121] Industrial availability

[0122] This invention is not limited to the manufacturing method of composite fibers used in general solution spinning, but can also be applied to the manufacturing method of composite fibers used in wet spinning and dry-wet spinning, but its application scope is not limited thereto.

[0123] Explanation of reference numerals in the attached figures

[0124] 1, 1', 1" Other component discharge holes

[0125] 2 Marine component discharge holes

[0126] 3 distribution boards

[0127] 4 discharge plates

[0128] 5 spinneret discharge plate

[0129] 6 dispensing holes

[0130] 7 distribution slots

[0131] 8 discharge holes

[0132] 9. Other components of the polymer (A)

[0133] 10 Other Component Polymers (B)

[0134] 11 Marine component polymers (C)

[0135] 12 Spinning Box

[0136] 13 Composite spinnerets

[0137] 14 Imaginary Circle

[0138] 15 Composite Polymers

[0139] 16 Spinneret discharge holes

[0140] 17. Confluence orifice

[0141] 18 Other Component Polymers (A)

[0142] 19 Other component polymers (B)

[0143] 20 Marine Component Polymer (C)

[0144] 21 Spinning Assembly

[0145] 22 Composite Fibers

[0146] 23 Discharge surface

[0147] 24 Imaginary Circle No. 2

[0148] 25 Cooling device

[0149] S in The sum of the pore areas of all marine component discharge holes located in the inner region of the imaginary circle.

[0150] S out The sum of the orifice areas of all marine component discharge holes located in the outer region of the imaginary circle.

Claims

1. A method for manufacturing a composite fiber, wherein a sea-based polymer and at least one other polymer different from the sea-based polymer are dispensed using a dispensing plate; the sea-based polymer and the other polymer dispensed by the dispensing plate are respectively discharged from sea-based discharge holes and other component discharge holes of a discharge plate disposed downstream of the dispensing plate relative to the polymer spinning path direction to form at least one composite polymer; and the composite polymer is discharged from discharge holes of a spinneret discharge plate disposed downstream of the discharge plate relative to the polymer spinning path direction, wherein... In the discharge surface of the discharge plate, corresponding to one of the composite polymers, at least one group of holes is formed by arranging a plurality of the marine component discharge holes around one or more of the other component discharge holes. In the first group of orifices, if the circle with the smallest diameter that includes all the other component discharge orifices on its inner side is designated as an imaginary circle, the total discharge amount Q of the marine component polymer discharged from all the marine component discharge orifices located in the outer region of this imaginary circle is... out The total discharge amount Q of the marine component polymer discharged from all the marine component discharge holes disposed in the inner region of the imaginary circle. in Satisfying Q out / Q in ≥0.5, Furthermore, in the group of holes, the total area S of all the sea component discharge holes located in the inner region of the imaginary circle is... in S is the sum of the orifice areas of all the sea component discharge holes located in the outer region of the imaginary circle. out Satisfy S in / S out ≥0.

5.

2. The method for manufacturing composite fibers according to claim 1, wherein, In the group of holes, the area of ​​one of the sea component discharge holes located in the outer region of the imaginary circle is greater than the area of ​​one of the sea component discharge holes located in the inner region of the imaginary circle.

3. The method for manufacturing composite fibers according to claim 1 or 2, wherein, In the group of holes, the amount of marine polymer discharged from one of the marine component discharge holes located in the outer region of the imaginary circle is greater than the amount of marine polymer discharged from one of the marine component discharge holes located in the inner region of the imaginary circle.

4. A composite spinneret for discharging at least one composite polymer stream, said composite polymer stream comprising a marine component polymer and at least one other component polymer different from the marine component polymer, wherein, The composite spinneret has the following features: A dispensing plate for dispensing the marine component polymer and the other component polymers; A discharge plate is disposed downstream of the distribution plate relative to the polymer spinning path direction and is formed with a marine component discharge hole for discharging the marine component polymer and a other component discharge hole for discharging the other component polymer. and A spinneret discharge plate is disposed downstream of the discharge plate relative to the polymer spinning path direction and has discharge holes for discharging the composite polymer. In the discharge surface of the discharge plate, corresponding to the one composite polymer flow, there is at least one group of holes arranged such that a plurality of marine component discharge holes surround one or more of the other component discharge holes. In the first group of holes, if the circle with the smallest diameter that includes all the other component discharge holes on the inner side is set as an imaginary circle, the hole area of ​​one of the marine component discharge holes located in the outer region of the imaginary circle is greater than the hole area of ​​one of the marine component discharge holes located in the inner region of the imaginary circle.

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