Composite spinning box for producing superfine denier ES (Ethylene-Propylene-Styrene) fibers
By designing an integrated spinneret and a concentric spinneret core in the composite spinning box, the coaxiality problem of the core-sheath composite spinning was solved, and high-quality production of ultrafine denier ES fibers was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 福建省福地新材料股份有限公司
- Filing Date
- 2026-04-07
- Publication Date
- 2026-05-12
AI Technical Summary
Existing technologies cannot guarantee the coaxiality of the cortex spinneret and the core spinneret, which affects the quality of ultrafine denier ES fibers.
A composite spinning box is adopted, in which the spinneret is composed of a first plate and a second plate that are integrated into one piece. The spinneret core is concentrically set with the mounting hole, and the coaxiality accuracy is ensured through the design of the limiting sleeve and the filter layer.
It improves the coaxiality accuracy of core-sheath composite spinning, meets the processing requirements of ultra-fine denier ES fibers, and reduces material costs and processing errors.
Smart Images
Figure CN122013337A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of spinning technology, and in particular to a composite spinning box for the production of ultrafine denier ES fibers. Background Technology
[0002] ES fiber is a typical core-sheath bicomponent composite fiber. Its production process involves precisely combining two different polymers (PE and PET) in a molten state through a composite spinning box, then extruding, cooling, stretching, and packing them into drums from the same spinneret, followed by subsequent drawing, crimping, drying, and cutting to form short fibers.
[0003] The core component of a composite spinning box is the composite spinning assembly. Two polymers with different properties or structures pass through the skin spinneret and core spinneret of the composite spinning assembly, respectively. Along the fiber axis, one component continuously surrounds the other to form a skin and core layer, and the fibers with a special cross-sectional shape are formed at the end of the spinneret's exit hole. There is one interface between the two components, and only one component has an external boundary.
[0004] The coaxiality of the sheath spinneret and the core spinneret has a significant impact on the forming quality of sheath-core composite fibers. However, the sheath spinneret and the core spinneret are often located on different structural components of the composite spinning assembly, making it difficult to ensure the coaxiality of the sheath spinneret and the core spinneret, thus making it difficult to guarantee the quality of the sheath-core composite fibers. This has a particularly significant impact on the quality of ultrafine denier ES fibers. Summary of the Invention
[0005] In order to improve the coaxiality of the sheath spinneret channel and the core spinneret channel in the spinning assembly, this application provides a composite spinning box for the production of ultrafine denier ES fibers.
[0006] This application provides a composite spinning box for the production of ultrafine denier ES fibers, employing the following technical solution: A composite spinning box for producing ultrafine denier ES fibers includes a box body and a spinning assembly. The box body has a spinning chamber, and the spinning assembly is installed in the spinning chamber. The spinning assembly includes a spinneret and a partition. The spinneret includes a first plate and a second plate that are parallel to each other and are integrally connected. A sheath component flow gap is left between the first plate and the second plate. The first plate has composite spinneret holes, and the second plate has a core spinneret on the side away from the first plate. The second plate has a core spinneret. The spinneret is installed in a mounting hole, and the spinneret is concentric with the mounting hole. The spinneret and the composite spinneret are arranged in a one-to-one correspondence. The spinneret has a spinneret hole that communicates with the composite spinneret hole. The partition is used to separate the inner space of the spinning chamber. The spinneret is located on one side of the partition. The partition has a leather component supply hole and a core component supply hole. The core component supply hole communicates with the gap between the second plate and the partition. The spinneret has a leather component drainage hole that communicates with the leather component supply hole.
[0007] By adopting the above technical solution, the spinneret is installed in the mounting hole on the first plate, and the core component supply hole on the spinneret is aligned with the composite spinneret hole on the second plate. Since the first and second plates are integrated, the composite spinneret hole and the mounting hole can be machined together on a machine tool in one step, eliminating the coaxiality error caused by the assembly connection between the first and second plates. This helps ensure the coaxiality between the composite spinneret hole and the mounting hole, thereby improving the quality of core-sheath composite spinning. The coaxiality accuracy of core-sheath composite spinning can be reliably controlled, which is beneficial for meeting the processing requirements of ultrafine denier ES fibers.
[0008] Optionally, the mounting hole includes a circular hole section and a conical hole section, the large end of the conical hole section is connected to the circular hole section, and the small end of the conical hole section faces the composite spinneret orifice. The core spinneret includes a cylindrical section and a conical section, the cylindrical section and the circular hole section are fitted with a transition fit, and the conical section is adapted to the conical hole section.
[0009] By adopting the above technical solution, the conical section of the spinneret and the conical section of the mounting hole are fitted together, which can maintain a high degree of concentricity between the spinneret and the mounting hole. The cylindrical section of the spinneret and the circular section of the mounting hole adopt a transition fit, which can ensure the fitting accuracy while also making the spinneret easier to assemble and disassemble.
[0010] Optionally, a limiting sleeve is installed at the end of the spinneret away from the first plate in an interference fit manner. The limiting sleeve abuts against the surface of the first plate away from the second plate. Both the end face of the limiting sleeve near the first plate and the surface of the first plate away from the second plate are polished surfaces. The length of the limiting sleeve is greater than the fit length between the spinneret and the limiting sleeve.
[0011] By adopting the above technical solution, the surfaces of the limiting sleeve and the first plate that abut against each other are all polished, so that the limiting sleeve and the first plate fit together as closely as possible, which helps to reduce the entry of the core component melt into the mating gap between the core component spinneret and the mounting hole.
[0012] Optionally, a core component filter layer is provided between the partition and the spinneret. The core component filter layer is conical, with its convex side facing away from the spinneret. The partition has an inner conical surface that matches the convex side of the core component filter layer. The position of the core component supply hole corresponds to the center of the core component filter layer.
[0013] By adopting the above technical solution, the core component filter layer is set in a cone shape to adapt to the diffusion path of fluid in loose porous materials, which helps to reduce the excess material inside the core component filter layer, thereby improving the efficiency of the core component solution passing through the core component filter layer and saving the material cost of the core component filter layer.
[0014] Optionally, a metal mesh is provided between the core component filter layer and the spinneret. The metal mesh is configured with a wavy structure and is in a pre-compression deformed state. The spinneret and the partition are connected by threaded fasteners, which are also connected to the housing.
[0015] By adopting the above technical solution, the spinneret and the partition are locked together by threaded fasteners, which causes the metal mesh to be compressed and deformed elastically. The elastic deformation force of the metal mesh can keep the core component filter layer pressed against the conical surface of the partition, so that the core component filter layer can play a filtering role on the core component melt component.
[0016] Optionally, the core component filter layer includes a primary filter layer and a secondary filter layer. The primary filter layer is conical, and the secondary filter layer is plate-shaped. The precision of the primary filter layer is lower than that of the secondary filter layer. The secondary filter layer is located on the side of the primary filter layer closer to the spinneret, and the convex side of the primary filter layer mates with the conical surface of the partition.
[0017] By adopting the above technical solution, the core component filter layer is composed of a first filter layer and a second filter layer, which can increase the filtration accuracy. The second filter layer has higher filtration accuracy and greater filtration resistance, and can indirectly play a dispersing role on the core component melt.
[0018] Optionally, the partition is connected to a plurality of guide tubes through the leather component supply hole, and the guide tubes are simultaneously connected to the leather component drainage holes one by one.
[0019] By adopting the above technical solution, the leather component material flows through the cavity of the guide tube and through the baffle, thereby indirectly flowing through the leather component supply hole and the leather component drainage hole, which helps to reduce the situation where the leather component melt seeps into the gap between the baffle and the spinneret.
[0020] Optionally, the leather component drainage holes are arranged in a circular array along the center circumference of the spinneret. The leather component drainage holes include straight holes and turning holes. The straight holes pass through the leather component flow gap in a straight line. The turning holes include longitudinal holes and transverse holes that are interconnected. The longitudinal holes are parallel to the straight holes. The end of the longitudinal hole away from the transverse hole is connected to the leather component supply hole. The end of the transverse hole away from the longitudinal hole is connected to the leather component flow gap.
[0021] By adopting the above technical solution, the skin component drainage holes are distributed in a circular array along the center of the spinneret, which can make the skin component melt distributed more evenly in the skin component flow gap; the skin component drainage holes are straight holes and turning holes, the turning holes can adapt to the connection part of the spinneret corresponding to the first plate and the second plate, and the straight holes can adapt to the part of the spinneret used to form the skin component flow gap.
[0022] Optionally, the threaded fasteners include bolts and nuts, and the number of threaded fasteners is less than the number of guide tubes. Both the partition plate and the spinneret are provided with holes for the bolts to pass through. When the bolts are installed, they pass through the guide tubes, and the holes in the spinneret for the bolts to pass through are connected to the leather component drainage holes.
[0023] By adopting the above technical solution, the bolts can pass through the guide tube during installation, which can reduce the amount of molten metal entering between the partition plate and the spinneret.
[0024] Optionally, the inner wall of the spinning chamber is provided with a primary stepped surface and a secondary stepped surface. The spinneret abuts against the primary stepped surface. A first sealing gasket is provided between the spinneret and the primary stepped surface. A second sealing gasket is provided between the partition and the secondary stepped surface. The bolt is fitted with an arched support washer. The bolt passes through the arched portion of the arched support washer. The bolt head abuts against the arched portion of the arched support washer. The arched support washer abuts against the partition. One end of the arched support washer faces the secondary stepped surface.
[0025] By adopting the above technical solution, when the threaded fastener is tightened, the preload between the bolt and nut can act on the first sealing gasket and the second sealing gasket simultaneously, so that a reliable sealing effect is formed between the spinning assembly and the spinning chamber.
[0026] In summary, this application includes at least one of the following beneficial technical effects: Because the first and second plates are integrated, the composite spinneret orifice and mounting hole can be machined together on a machine tool in one step. This eliminates the coaxiality error caused by the assembly connection between the first and second plates, thus ensuring the coaxiality between the composite spinneret orifice and the mounting hole, and improving the quality of core-sheath composite spinning. The coaxiality accuracy of core-sheath composite spinning can be reliably controlled, which is beneficial for meeting the processing requirements of ultrafine denier ES fibers.
[0027] The core component filter layer is designed in a cone shape to adapt to the diffusion path of fluid in loose porous materials. This helps to reduce excess material inside the core component filter layer, thereby improving the efficiency of the core component solution passing through the core component filter layer and saving material costs of the core component filter layer. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of Example 1.
[0029] Figure 2 This is a schematic diagram of the spinning assembly in Example 1.
[0030] Figure 3 This is a schematic diagram of the spinneret structure in Example 1.
[0031] Figure 4 This is a schematic diagram of the spinning assembly in Example 2.
[0032] Explanation of reference numerals in the attached figures: 1. Housing; 11. Spinning chamber; 111. First-level stepped surface; 112. Second-level stepped surface; 113. First sealing gasket; 114. Second sealing gasket; 12. Heating chamber; 13. Insulation chamber; 2. Spinning assembly; 21. Spinneret; 211. First plate; 212. Second plate; 213. Leather component flow gap; 214. Composite spinneret orifice; 215. Mounting hole; 2151. Circular hole section; 2152. Conical hole section; 216. Leather component drainage hole; 2161. Straight through hole; 2162. Turning hole; 21 63. Longitudinal hole; 2164. Transverse hole; 22. Partition; 221. Leather component supply hole; 222. Core component supply hole; 223. Inner conical surface; 23. Core spinneret; 231. Cylindrical section; 232. Conical section; 233. Core spinneret hole; 24. Threaded fastener; 241. Bolt; 242. Nut; 243. Arched support washer; 25. Guide tube; 26. Core component filter layer; 261. Primary filter layer; 262. Secondary filter layer; 27. Limiting sleeve; 28. Metal mesh; 29. Leather component filter layer. Detailed Implementation
[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail. Example 1
[0034] This application discloses a composite spinning box for the production of ultrafine denier ES fibers. (Refer to...) Figure 1 The composite spinning box for the production of ultrafine denier ES fibers includes a box body 1 and a spinning assembly 2. The box body 1 is provided with a spinning chamber 11, a heating chamber 12 and an insulation chamber 13. The heating chamber 12 is filled with heat-conducting oil, which is used to conduct heat from heating devices such as heating rods to the melt in the spinning chamber 11. The insulation chamber 13 is filled with insulation material. The spinning chamber 11 is located inside the heating chamber 12, and the heating chamber 12 is located inside the insulation chamber 13. The spinning assembly 2 is installed inside the spinning chamber 11.
[0035] Reference Figure 1 and Figure 2 The spinning assembly 2 includes a spinneret 21 and a partition 22. The spinneret 21 and the partition 22 are connected by a threaded fastener 24, which is also connected to the wall of the housing 1. The spinneret 21 includes a first plate 211 and a second plate 212 that are parallel to each other. The first plate 211 and the second plate 212 are integrated. A leather component flow gap 213 is left between the first plate 211 and the second plate 212. The first plate 211 is provided with a composite spinneret hole 214. The second plate 212 is provided with a core spinneret 23 on the side away from the first plate 211. The second plate 212 is provided with a mounting hole 215 for mounting the core spinneret 23. The core spinneret 23 and the mounting hole 215 are concentric. The core spinneret 23 and the composite spinneret hole 214 are arranged one-to-one. The core spinneret 23 is provided with a core spinneret hole 233 that communicates with the composite spinneret hole 214.
[0036] The mounting hole 215 includes a circular hole section 2151 and a tapered hole section 2152. The large end of the tapered hole section 2152 is connected to the circular hole section 2151, and the small end of the tapered hole section 2152 faces the composite spinneret hole 214. The core spinneret 23 includes a cylindrical section 231 and a tapered section 232. The cylindrical section 231 and the circular hole section 2151 are interference-fitted.
[0037] The partition 22 is used to separate the inner space of the spinning chamber 11. The spinneret 21 is located on one side of the partition 22. The partition 22 is provided with a leather component supply hole 221 and a core component supply hole 222. The core component supply hole 222 connects the gap between the second plate 212 and the partition 22. The spinneret 21 is provided with a leather component drainage hole 216 that communicates with the leather component supply hole 221.
[0038] Reference Figure 2 and Figure 3The leather component drainage holes 216 are distributed in a circular array along the center of the spinneret 21. The leather component drainage holes 216 include straight holes 2161 and turning holes 2162. The straight holes 2161 pass through the leather component flow gap 213 in a straight line. The turning holes 2162 include longitudinal holes 2163 and transverse holes 2164 that are connected to each other. The longitudinal holes 2163 are parallel to the straight holes 2161. The end of the longitudinal holes 2163 away from the transverse holes 2164 is connected to the leather component supply hole 221. The end of the transverse holes 2164 away from the longitudinal holes 2163 is connected to the leather component flow gap 213.
[0039] The partition 22 is connected to several guide tubes 25 through the leather component supply hole 221, and the guide tubes 25 are simultaneously connected to the leather component drainage hole 216 one by one.
[0040] Reference Figure 2 The threaded fasteners 24 include bolts 241 and nuts 242. The number of threaded fasteners 24 is less than the number of guide tubes 25. Both the partition plate 22 and the spinneret 21 are provided with holes for the bolts 241 to pass through. When the bolts 241 are installed, they pass through the guide tubes 25. The holes in the spinneret 21 for the bolts 241 to pass through are connected to the leather component drainage holes 216.
[0041] Reference Figure 1 and Figure 2 The inner wall of the spinning chamber 11 is provided with a first-level stepped surface 111 and a second-level stepped surface 112. The spinneret 21 abuts against the first-level stepped surface 111. The bolt 241 passes through the part of the spinning chamber 11 corresponding to the first-level stepped surface 111. A first sealing gasket 113 is provided between the spinneret 21 and the first-level stepped surface 111. A second sealing gasket 114 is provided between the partition 22 and the second-level stepped surface 112. The bolt 241 is fitted with an arched support gasket 243. The bolt 241 passes through the arched part of the arched support gasket 243. The bolt head of the bolt 241 abuts against the arched part of the arched support gasket 243. The arched support gasket 243 abuts against the partition 22. One end of the arched support gasket 243 faces the second-level stepped surface 112.
[0042] Referring to Figure X, a core component filter layer 26 is provided between the partition 22 and the spinneret 21, and the position of the core component supply hole 222 corresponds to the center of the core component filter layer 26. The core component filter layer 26 includes a primary filter layer 261 and a secondary filter layer 262, both of which are sintered felt. The primary filter layer 261 is conical, and the secondary filter layer 262 is plate-shaped. The precision of the primary filter layer 261 is less than that of the secondary filter layer 262. The secondary filter layer 262 is located on the side of the primary filter layer 261 closest to the spinneret 21. The partition 22 has an inner conical surface 223 adapted to the primary filter layer 261. A spacer is provided between the secondary filter layer 262 and the spinneret 21, creating a gap between the core component filter layer 26 and the spinneret 21.
[0043] Reference Figure 1 The side of the partition 22 away from the spinneret 21 is provided with a leather component filter layer 29, and the bolt 241 passes through the leather component filter layer 29. The arched support pad 243 presses down on the leather component filter layer 29.
[0044] The implementation principle of a composite spinning box for producing ultrafine denier ES fibers according to an embodiment of this application is as follows: the spinneret is installed in the mounting hole 215 on the first plate 211, and the core component supply hole 222 on the spinneret is aligned with the composite spinneret hole 214 on the second plate 212. Since the first plate 211 and the second plate 212 are integrated, the composite spinneret hole 214 and the mounting hole 215 can be machined together on a machine tool in one step, eliminating the coaxiality error caused by the assembly connection between the first plate 211 and the second plate 212. This helps ensure the coaxiality between the composite spinneret hole 214 and the mounting hole 215, thereby improving the quality of core-sheath composite spinning. The coaxiality accuracy of core-sheath composite spinning can be reliably controlled, which is beneficial for meeting the processing requirements of ultrafine denier ES fibers. Example 2
[0045] Reference Figure 4 The difference between this embodiment and Embodiment 1 is that, in this embodiment, the cylindrical section 231 of the spinneret and the circular hole section 2151 of the mounting hole 215 adopt a transition fit, and the conical section 232 of the spinneret and the conical hole section 2152 of the mounting hole 215 abut against each other. A limiting sleeve 27 is installed at the end of the spinneret 23 away from the first plate 211 with an interference fit. The limiting sleeve 27 abuts against the surface of the first plate 211 away from the second plate 212. Both the end face of the limiting sleeve 27 near the first plate 211 and the surface of the first plate 211 away from the second plate 212 are polished surfaces. The length of the limiting sleeve 27 is greater than the fit length between the spinneret 23 and the limiting sleeve 27.
[0046] A metal mesh 28 is provided between the filter layer and the spinneret 21. The metal mesh 28 has a wavy structure and is in a pre-compressed and deformed state. One side of the metal mesh 28 abuts against the filter layer, and the other side abuts against each limiting sleeve 27, so that the conical section 232 of the spinneret core and the conical hole section 2152 of the mounting hole 215 abut against each other, and the filter layer abuts against the inner conical surface 223. In this embodiment, with the metal mesh 28 provided, there is no need to provide a separator gasket.
[0047] The implementation principle of this embodiment is as follows: the conical segment 232 of the spinneret 23 mates with the conical hole segment 2152 of the mounting hole 215, enabling the spinneret 23 and the mounting hole 215 to maintain a high degree of concentricity. The cylindrical segment 231 of the spinneret 23 and the circular hole segment 2151 of the mounting hole 215 adopt a transition fit, which ensures the fitting accuracy while also making the spinneret 23 easier to assemble and disassemble. The surfaces of the limiting sleeve 27 and the first plate 211 that abut against each other are both polished, so that the limiting sleeve 27 and the first plate 211 fit as closely as possible, which helps to reduce the amount of core component melt entering the fitting gap between the core component spinneret and the mounting hole 215.
[0048] In this embodiment, when polishing the limiting sleeve 27 and the spinneret 21, the polished surface of the spinneret 21 is processed first. Then, the spinneret core and the limiting sleeve 27 are installed on the spinneret 21. The end of the limiting sleeve 27 away from the spinneret 21 is polished. After the limiting sleeve 27 is polished, it is removed from the spinneret core, the two ends are swapped, and then it is reinstalled on the spinneret core so that the polished surface of the limiting sleeve 27 and the polished surface of the spinneret 21 are in close contact. The fact that the polished surface of the limiting sleeve 27 is processed on the spinneret core ensures the parallelism between the polished surface of the limiting sleeve 27 and the polished surface of the spinneret 21.
[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A composite spinning box for the production of ultrafine denier ES fibers, characterized in that: The assembly includes a housing (1) and a spinning assembly (2). The housing (1) has a spinning chamber (11), and the spinning assembly (2) is installed in the spinning chamber (11). The spinning assembly (2) includes a spinneret (21) and a partition (22). The spinneret (21) includes a first plate (211) and a second plate (212) that are parallel to each other. The first plate (211) and the second plate (212) are connected as one unit. A sheath flow gap (213) is left between the first plate (211) and the second plate (212). The first plate (211) is provided with a composite spinneret hole (214). The second plate (212) has a core spinneret (23) on the side away from the first plate (211). The second plate (212) is provided with a space for installing the core spinneret (23). The mounting hole (215) of the core spinneret (23) is concentric with the mounting hole (215). The core spinneret (23) is provided in a one-to-one correspondence with the composite spinneret (214). The core spinneret (23) is provided with a core spinneret (233) that communicates with the composite spinneret (214). The partition (22) is used to separate the inner space of the spinning chamber (11). The spinneret (21) is located on one side of the partition (22). The partition (22) is provided with a leather component supply hole (221) and a core component supply hole (222). The core component supply hole (222) communicates with the gap between the second plate (212) and the partition (22). The spinneret (21) is provided with a leather component drainage hole (216) that communicates with the leather component supply hole (221).
2. The composite spinning box for producing ultrafine denier ES fibers according to claim 1, characterized in that: The mounting hole (215) includes a circular hole section (2151) and a conical hole section (2152). The large end of the conical hole section (2152) is connected to the circular hole section (2151), and the small end of the conical hole section (2152) faces the composite spinneret hole (214). The core spinneret (23) includes a cylindrical section (231) and a conical section (232). The cylindrical section (231) and the circular hole section (2151) are fitted together, and the conical section (232) is adapted to the conical hole section (2152).
3. A composite spinning box for producing ultrafine denier ES fibers according to claim 2, characterized in that: The end of the spinneret (23) away from the first plate (211) is fitted with a limiting sleeve (27) by an interference fit. The limiting sleeve (27) abuts against the surface of the first plate (211) away from the second plate (212). The end face of the limiting sleeve (27) near the first plate (211) and the surface of the first plate (211) away from the second plate (212) are both polished surfaces. The length of the limiting sleeve (27) is greater than the fit length between the spinneret (23) and the limiting sleeve (27).
4. A composite spinning box for producing ultrafine denier ES fibers according to claim 1, characterized in that: A core component filter layer (26) is provided between the partition (22) and the spinneret (21). The core component filter layer (26) is conical, and the convex side of the core component filter layer (26) is away from the spinneret (21). The partition (22) is provided with an inner conical surface (223) that is adapted to the convex side of the core component filter layer (26). The position of the core component supply hole (222) corresponds to the center of the core component filter layer (26).
5. A composite spinning box for producing ultrafine denier ES fibers according to claim 4, characterized in that: A metal mesh (28) is provided between the core component filter layer (26) and the spinneret (21). The metal mesh (28) is configured as a wave-shaped structure and is in a pre-compression deformation state. The spinneret (21) and the partition (22) are connected by a threaded fastener (24), which is also connected to the housing (1).
6. A composite spinning box for producing ultrafine denier ES fibers according to claim 5, characterized in that: The core component filter layer (26) includes a primary filter layer (261) and a secondary filter layer (262). The primary filter layer (261) is conical, and the secondary filter layer (262) is plate-shaped. The precision of the primary filter layer (261) is less than that of the secondary filter layer (262). The secondary filter layer (262) is located on the side of the primary filter layer (261) closer to the spinneret (21). The convex side of the primary filter layer (261) is engaged with the conical surface of the partition plate (22).
7. A composite spinning box for producing ultrafine denier ES fibers according to claim 6, characterized in that: The partition (22) has several guide tubes (25) inserted through the leather component supply hole (221), and the guide tubes (25) are simultaneously inserted into the leather component drainage hole (216) one by one.
8. A composite spinning box for producing ultrafine denier ES fibers according to claim 7, characterized in that: The leather component drainage holes (216) are arranged in a circular array along the center circumference of the spinneret (21). The leather component drainage holes (216) include a straight hole (2161) and a turning hole (2162). The straight hole (2161) passes through the leather component flow gap (213) in a straight line. The turning hole (2162) includes a longitudinal hole (2163) and a transverse hole (2164) that are connected to each other. The longitudinal hole (2163) is parallel to the straight hole (2161). The end of the longitudinal hole (2163) away from the transverse hole (2164) is connected to the leather component supply hole (221). The end of the transverse hole (2164) away from the longitudinal hole (2163) is connected to the leather component flow gap (213).
9. A composite spinning box for producing ultrafine denier ES fibers according to claim 8, characterized in that: The threaded fastener (24) includes a bolt (241) and a nut (242). The number of threaded fasteners (24) is less than the number of guide tubes (25). Both the partition plate (22) and the spinneret (21) are provided with holes for the bolts (241) to pass through. When the bolts (241) are installed, they pass through the guide tubes (25). The holes in the spinneret (21) for the bolts (241) to pass through are connected to the leather component drainage holes (216).
10. A composite spinning box for producing ultrafine denier ES fibers according to claim 9, characterized in that: The inner wall of the spinning chamber (11) is provided with a first-level stepped surface (111) and a second-level stepped surface (112). The spinneret (21) abuts against the first-level stepped surface (111). A first sealing gasket (113) is provided between the spinneret (21) and the first-level stepped surface (111). A second sealing gasket (114) is provided between the partition (22) and the second-level stepped surface (112). The bolt (241) is fitted with an arched support washer (243). The bolt (241) passes through the arched part of the arched support washer (243). The bolt head of the bolt (241) abuts against the arched part of the arched support washer (243). The arched support washer (243) abuts against the partition (22). One end of the arched support washer (243) faces the second-level stepped surface (112).