Continuous spinning jet structure for producing flat filaments

Abstract

The utility model belongs to the technical field of textile material, specifically disclose a kind of continuous spinning spinneret structure of preparation flat wire, including spinneret, the tail end of spinneret is set in nozzle nut, the head end of spinneret protrudes from the head end end surface of nozzle nut, and spinneret head end end surface is uniformly distributed with the spinneret hole structure of rotation symmetry along spinneret head end center;The one end of nozzle nut close to spinneret is equipped with the spinning front filter screen of gap cooperation with spinneret;Spinneret close to nozzle nut side is equipped with the nozzle gasket of nozzle nut end portion adhesion;The side of spinning front filter screen close to spinneret is equipped with the filter gasket of spinneret side adhesion.

Description

Technical Field

[0001] This utility model belongs to the field of textile materials technology, and specifically relates to a continuous spinning spinneret structure for preparing flat filaments. Background Technology

[0002] As the textile industry develops towards high-end and differentiated products, flat filament regenerated cellulose fiber has become a core raw material for high-end textiles due to its excellent luster, drape, and fabric coverage. However, existing spinneret technology has many defects, which seriously restrict product quality and production efficiency.

[0003] First, existing spinneret designs focus only on the cross-sectional shape of the spinneret orifice. This localized design can easily lead to pressure fluctuations and uneven flow when the spinning solution is input. The difference in extrusion volume among multiple spinneret orifices can reach more than 10%, resulting in a high cross-sectional asymmetry rate in the final product, which makes it difficult to meet the quality requirements of high-end textiles.

[0004] Secondly, since existing technologies mostly use rubber gaskets for rigid contact sealing, rigid contact seals are prone to gaps due to assembly stress or long-term use, resulting in insufficient sealing performance of the spinneret. Actual measurements show that the leakage rate of spinning solution in this type of spinneret is as high as 3%-5%, which will cause waste of raw materials, increase production costs, pollute the production environment, increase the difficulty of equipment maintenance, and easily contaminate the spinning solution, ultimately affecting the quality of textiles.

[0005] Furthermore, most existing spinnerets lack an effective pre-spinning filtration mechanism. Undissolved slurry lumps, metal debris, and other tiny impurities remaining in the spinning solution can easily clog the spinneret orifices, causing the spinneret extrusion to be interrupted and resulting in an increased product breakage rate, which can be as high as 5-8 times / ton. This will seriously affect the continuity of production and the stability of product quality.

[0006] In addition, the existing spinneret structure lacks a precise guiding and positioning mechanism, which makes the spinneret assembly prone to misalignment, further aggravating the problem of uneven extrusion; at the same time, it increases the difficulty of disassembling and maintaining the spinneret structure, increasing downtime and labor costs. Utility Model Content

[0007] To address the aforementioned issues, this application provides a continuous spinning spinneret structure for preparing flat filaments that can improve the sealing performance of the spinneret, filter spinning solution, and enhance the quality of textiles.

[0008] To achieve the above objectives, this utility model is realized through the following technical solution: A continuous spinning spinneret structure for producing flat yarns includes a spinneret, the tail end of which is fitted inside a spinneret nut, and the head end of the spinneret protruding beyond the head end face of the spinneret nut. The head end face of the spinneret has a rectangular spinneret hole structure evenly distributed, rotating symmetrically around the center of the head end. The number of spinneret holes can be set to 2F, 4F, or 6F according to process requirements, adapting to the production of flat yarns with deniers from 30D to 100D. A pre-spinning filter, fitted with a clearance fit between the spinneret and the spinneret, is fitted inside the spinneret nut at one end near the spinneret. The spinneret has a spinneret washer fitted on the side near the spinneret nut, which fits snugly against the end of the spinneret nut; the pre-spinning filter screen has a filter washer fitted on the side near the spinneret, which fits snugly against the side of the spinneret; the spinneret nut is a cap-shaped encapsulation structure made of ABS material, with internal threads on the inner wall. The internal threads of the spinneret nut adopt the metric thread specified in GB / T20084-2006, with a specification of M22×1.5, and are adapted to connect with the external threads of the spinneret; the spinneret is made of high-strength alloy material, and the spinneret orifice structure is a flat spinneret orifice.

[0009] Preferably, the nozzle nut provides external axial fixation and protection for the entire spinneret, and also ensures a tight fit of all components through thread preload, combining lightweight (reducing equipment load) and resistance to spinning solution corrosion (no degradation after long-term contact). The spinneret is made of high-strength alloy material, integrating the spinneret orifice structure and internal spinning solution flow channel. The cross-section of the spinneret orifice structure is symmetrical rectangular, with the long side dimension being 0.25-0.5mm and the short side dimension being 0.02-0.04mm. Each of the two long sides has 9 arc-shaped structures with a radius of 0.01-0.02mm to ensure regular shaping of the flat filament cross-section and smooth extrusion of the spinning solution. The spinneret has a conical diversion cavity inside, realizing the uniform diffusion of the spinning solution from the centralized input to multiple spinneret orifice structures.

[0010] Preferably, the spinneret structure includes rectangular spinnerets formed on the end face of the spinneret head, and the long side of the rectangular spinneret is symmetrically provided with arc-shaped guide grooves with a radius of 0.01-0.02 mm. The rectangular spinnerets are located at both ends and on the long side of the rectangular spinneret, and the number of rectangular spinnerets is 9 pairs.

[0011] Preferably, the spinneret has a conical diversion cavity that communicates with the spinneret orifice. The spinneret protrudes from the head end face of the spinneret nut through the spinneret hole set on the spinneret nut. The large end diameter of the conical diversion cavity matches the liquid inlet channel connected to the spinneret nut. The small end diameter of the conical diversion cavity is 15-20 mm, and the depth is 5-8 mm. The outlet of the conical diversion cavity corresponds completely to the spinneret orifice. The angle of the conical diversion cavity is designed to be 30°-45°. Fluid simulation verification shows that the flow rate difference of the spinning solution in the conical diversion cavity is ≤3%, ensuring the consistency of extrusion from multiple spinnerets.

[0012] Preferably, a spinning pre-filter is provided on the side of the spinning pre-filter away from the spinneret, and a positioning washer is provided on the side of the spinning pre-filter away from the spinning pre-filter; a filter mounting groove that cooperates with the spinning pre-filter is provided inside the spinneret.

[0013] Preferably, the nozzle gasket, filter gasket, pre-spinning gasket, and positioning gasket are all connected to the inner wall of the nozzle nut via threads on their outer circumferences. All the nozzle gaskets, filter gaskets, pre-spinning gaskets, and positioning gaskets are hollow frustum-shaped and made of latex with a thickness of 0.5-1mm. The hollow frustum design provides a sealing surface that is 50%-80% larger than standard gaskets. The elasticity of the latex allows for a dual function: each gasket provides a sealing function, ensuring a gap of <0.01mm between the mating surfaces of each component and a spinning solution leakage rate of <0.1%. Each gasket also provides a buffering function, absorbing mechanical stress during assembly and preventing damage to precision components such as the spinneret and filter due to rigid contact, while also improving sealing reliability after repeated disassembly and assembly. Each gasket employs a dual design of "hollow frustum + threaded compression," exhibiting excellent compression recovery performance and self-sealing capability, with a thermal limit of 85℃, meeting long-term production requirements. The components of this invention achieve axial fixation and sealing through the threaded connection of the nozzle nut.

[0014] Preferably, the pre-spinning filter is a 200-300 mesh metal wire mesh, which is set in the upstream flow channel of the spinneret (between the spinneret and the liquid inlet). It can intercept impurities with a particle size >0.02mm, taking into account both filtration accuracy and flow resistance. It ensures that the impurity interception rate is >95% while the pressure drop loss is <5%, avoids spinneret blockage, ensures the consistency of extrusion volume of multiple spinneret structures, and does not affect the fluidity of the spinning solution.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model, by installing a pre-spinning filter screen inside the spinneret, can filter out minute impurities remaining in the spinning solution, thereby improving the product quality of textiles, preventing minute impurities in the spinning solution from clogging the spinneret, reducing the probability of clogging of the spinning hole structure, and thus improving the production efficiency of textiles. By setting a near-rectangular spinneret structure at the head end of the spinneret, the cross-section of the spinneret structure is precisely matched with the cross-section of the regenerated cellulose flat filament, improving the matching degree of fiber forming shape. Each gasket in this utility model adopts the form of "hollow frustum + threaded compression", and with the flow of the spinning solution, it can continuously apply force to each gasket, thereby compressing each gasket, preventing gasket failure, and improving the continuous sealing performance of this utility model.

[0016] 2. This utility model has a complete structure, reliable sealing, and can meet the high-efficiency filtration requirements of continuous spinning spinnerets. It can solve the problems of irregular cross-sectional shape, difficulty in controlling size ratio, poor forming stability, easy leakage and misalignment, and easy clogging in the prior art, and can improve the consistency of flat yarn quality and production efficiency.

[0017] 3. This utility model is a multi-component collaborative structure, the core of which includes an ABS nozzle nut, a high-strength alloy spinneret base, a 200-300 mesh pre-spinning filter, and four sets of latex gaskets of different specifications; wherein, the nozzle nut provides axial fixation and external protection for the whole, the pre-spinning filter intercepts impurities >0.02mm in the spinning solution to avoid clogging of the spinneret holes, the latex gaskets achieve sealing between the components (leakage rate <0.1%) and assembly stress buffering, and the spinneret base serves as the core load-bearing foundation, on which a symmetrically distributed spinneret hole structure is opened to meet the needs of flat yarn preparation.

[0018] 4. The main cross-section of the spinneret structure of this utility model is rectangular. The long side dimension of the rectangular spinneret in the spinneret structure is independently controlled to be 0.08-0.12mm, and the short side dimension is independently controlled to be 0.02-0.04mm. The two ends are smoothly connected by an arc-shaped spinneret groove (radius 0.01-0.02mm). This can ensure smooth flow of spinning solution and make the cross-section of the spinneret structure accurately match the cross-section of the regenerated cellulose flat filament, thereby improving the matching degree of fiber forming morphology.

[0019] 5. This utility model, through the synergistic optimization of "overall assembly structure + precise cross-section design", enables the generated regenerated cellulose fibers to form a unique flat cross-section, thereby significantly improving the fiber specific surface area and fabric coverage, enhancing luster and drape, and making the fabric texture superior and the style more unique. This utility model can also optimize the extrusion state of the spinning solution, reduce flow resistance, and ensure stable flat filament forming to improve mechanical properties (dry breaking strength reaches 2.8~3.2cN / dtex). At the same time, by adjusting the number of spinnerets (2F / 4F / 6F), it can adapt to different denier requirements, stably produce products of specifications such as 30D / 2F and 50D / 4F, meet diverse process requirements, and comprehensively improve the quality and application value of flat filament regenerated cellulose fibers. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cross-section of the head end of the spinneret; Figure 3 This is a schematic diagram of the spinneret hole structure.

[0021] In the figure, the nozzle nut is 1, the spinneret is 2, the pre-spinning filter is 3, the nozzle washer is 4, the filter washer is 5, the pre-spinning washer is 6, the positioning washer is 7, the conical diversion cavity is 8, the spinneret structure is 9, the rectangular spinneret is 10, and the arc-shaped guide groove is 11. Detailed Implementation

[0022] The present invention will be further described in detail below through specific embodiments, but this does not limit the scope of the present invention.

[0023] Example 1 A continuous spinning spinneret structure for preparing flat filaments, the structure of which is as follows: Figure 1-3 As shown, the spinneret 2 is included. The tail end of the spinneret 2 is fitted inside the spinneret nut 1, and the head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. The head end face of the spinneret 2 is evenly distributed with a rectangular spinneret hole structure 9 that is rotationally symmetrical around the center of the head end of the spinneret 2. A pre-spinning filter screen 3 is fitted inside the spinneret nut 1 near the end of the spinneret 2 and has a clearance fit with the spinneret 2. A spinneret washer 4 is fitted on the side of the spinneret 2 near the spinneret nut 1 and fits against the end of the spinneret nut 1. A filter washer 5 is fitted on the side of the pre-spinning filter screen 3 near the spinneret 2 and fits against the side of the spinneret 2.

[0024] The spinneret structure 9 includes a rectangular spinneret hole 10 formed on the end face of the spinneret head 2, and an arc-shaped guide groove 11 symmetrically formed on the long side of the rectangular spinneret hole 10. The spinneret head 2 is provided with a conical flow-dividing cavity 8 that communicates with the spinneret hole, and the spinneret head 2 protrudes from the end face of the spinneret nut 1 through the nozzle hole provided on the nozzle nut 1.

[0025] A spinning pre-filter 3 has a spinning pre-washer 6 on the side away from the spinneret 2, and a positioning washer 7 on the side of the spinning pre-filter 6 away from the spinning pre-filter 3. The spinneret 2 has a filter mounting groove that mates with the spinning pre-filter 3. The spinneret washer 4, filter washer 5, spinning pre-filter 6, and positioning washer 7 are all connected to the inner wall of the spinneret nut 1 by threads on their outer circumferences. All of these components are hollow frustum-shaped. The spinning pre-filter 3 is a 200-300 mesh metal wire mesh.

[0026] This embodiment uses a 30D / 2F flat filament spinneret 2; the structural parameters used in this embodiment are as follows: the nozzle nut 1 is made of ABS material, and the internal thread specification of the nozzle nut 1 is M22×1.5, which conforms to the GB / T20084-2006 standard.

[0027] In this embodiment, the spinneret 2 is made of high-strength alloy material, and the spinneret hole structure 9 is symmetrically distributed in two groups. The long side of the rectangular spinneret hole 10 in the spinneret hole structure 9 is 0.1 mm, the short side is 0.03 mm, the long side / short side ratio is 3.3:1, and the radius of the arc-shaped guide groove 11 is 0.015 mm. The large end diameter of the conical diversion cavity 8 is 10 mm, the small end diameter is 15 mm, and the depth is 6 mm.

[0028] In this embodiment, the pre-spinning filter 3 is made of 250-mesh stainless steel wire mesh, with a diameter of 20mm and a thickness of 0.1mm. In this embodiment, the nozzle gasket 4 (axial mating surface) has a thickness of 0.8mm, the filter gasket 5 (radial mating surface) has a thickness of 0.5mm, and the pre-spinning gasket 6 and positioning gasket 7 (positioning surface) have a thickness of 0.6mm. All gaskets adopt a hollow frustum design, and the sealing surface is 65% larger than that of a standard gasket.

[0029] The assembly steps in this embodiment include: a. Install the filter gasket 5 on the radial mating surface between the pre-spinning filter screen 3 and the spinneret 2, and then place the pre-spinning filter screen 3 into the filter mounting groove of the spinneret 2.

[0030] b. Install the pre-spinning washer 6 and the positioning washer 7 on the axial positioning surface of the spinneret 2 to ensure accurate positioning without deviation.

[0031] c. Install the nozzle washer 4 on the axial mating surface between the nozzle nut 1 and the spinneret 2.

[0032] d. Continue to tighten the nozzle nut 1, controlling the tightening torque to 8-10 N·m, to ensure that all parts fit tightly and are evenly stressed.

[0033] e. Assembly inspection: Verify the sealing performance through a pressure test (0.5MPa pressure, hold pressure for 5 minutes). If there is no leakage, the assembly is complete.

[0034] Production application of this embodiment: ① Spinning solution preparation: Cotton wood pulp is dissolved (NaOH concentration 18%), yellowed (CS2 dosage is 28% of the wood pulp mass), filtered (100 mesh filter), and defoamed (vacuum degree -0.09MPa) to obtain a spinning solution with a viscosity of 5000cP.

[0035] ② Spinning process: The spinning solution is first filtered through the pre-spinning filter screen 3 along the nozzle nut 1 to remove impurities >0.02mm. Then it enters the conical diversion chamber 8 of the spinneret 2 and diffuses evenly. Then it simultaneously enters the rectangular spinneret holes 10 and the arc-shaped guide groove 11 of the two sets of spinneret hole structures 9 for extrusion. After extrusion, it is passed through an acid bath (H2SO4 concentration 10%, N2SO4 concentration 10%). a2SO4 concentration 25%, temperature 45℃) solidification, roller stretching (stretching ratio 3.5 times), water washing (water temperature 60℃, water washing 3 times), drying (temperature 120℃), winding (speed 140m / min) to obtain 30D / 2F flat yarn.

[0036] Performance testing of the 30D / 2F flat yarn obtained in this embodiment: ① Cross-sectional quality: The asymmetry rate of the flat wire cross-section is 2.1%, and the deviation of the long side / short side dimension is ±0.001mm.

[0037] ②Mechanical properties: Dry breaking strength 3.0 cN / dtex, wet breaking strength 2.2 cN / dtex, dry breaking elongation 18%.

[0038] ③ Production stability: This continuous spinning spinneret structure has no leakage after 1200 hours of continuous production, with a leakage rate of <0.1%, a breakage rate of 0.2 times / ton, and no clogging of the spinneret hole structure 9.

[0039] ④ Sealing performance: After 1200 hours of continuous use, the compression recovery rate of nozzle gasket 4, filter gasket 5, pre-spinning gasket 6 and positioning gasket 7 still remained above 90%, and the sealing performance did not decrease significantly.

[0040] Example 2 A continuous spinning spinneret structure for preparing flat filaments, the structure of which is as follows: Figure 1-3 As shown, the spinneret 2 is included. The tail end of the spinneret 2 is fitted inside the spinneret nut 1, and the head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. Spinning holes 9 are evenly distributed on the head end face of the spinneret 2, which are symmetrically arranged around the center of the head end of the spinneret 2. A pre-spinning filter screen 3 is fitted inside the spinneret nut 1 near the end of the spinneret 2, which is in clearance fit with the spinneret 2. A spinneret washer 4 is fitted on the side of the spinneret 2 near the spinneret nut 1, which fits against the end of the spinneret nut 1. A filter washer 5 is fitted on the side of the pre-spinning filter screen 3 near the spinneret 2, which fits against the side of the spinneret 2.

[0041] The spinneret structure 9 includes a rectangular spinneret hole 10 formed on the end face of the spinneret head 2, and an arc-shaped guide groove 11 symmetrically formed on the long side of the rectangular spinneret hole 10. The spinneret head 2 is provided with a conical flow-dividing cavity 8 that communicates with the spinneret hole, and the spinneret head 2 protrudes from the end face of the spinneret nut 1 through the nozzle hole provided on the nozzle nut 1.

[0042] A spinning pre-filter 3 has a spinning pre-washer 6 on the side away from the spinneret 2, and a positioning washer 7 on the side of the spinning pre-filter 6 away from the spinning pre-filter 3. The spinneret 2 has a filter mounting groove that mates with the spinning pre-filter 3. The spinneret washer 4, filter washer 5, spinning pre-filter 6, and positioning washer 7 are all connected to the inner wall of the spinneret nut 1 by threads on their outer circumferences. All of these components are hollow frustum-shaped. The spinning pre-filter 3 is a 200-300 mesh metal wire mesh.

[0043] This embodiment uses a 50D / 4F flat filament spinneret 2; the structural parameters used in this embodiment are: ①In this embodiment, the nozzle nut 1 is made of ABS material, and the internal thread specification of the nozzle nut 1 is M27×1.5.

[0044] ② In this embodiment, the spinneret 2 is made of high-strength alloy material, and the spinneret hole structure 9 is 4 sets symmetrically distributed. The long side of the rectangular spinneret hole 10 in the spinneret hole structure 9 is 0.12mm, the short side is 0.04mm, the long side / short side ratio is 3:1, and the radius of the arc-shaped guide groove 11 is 0.02mm. The large end diameter of the conical diversion cavity 8 is 12mm, the small end diameter is 20mm, and the depth is 8mm.

[0045] ③ In this embodiment, the pre-spinning filter screen 3 is made of 300-mesh stainless steel wire mesh; ④ In this embodiment, the thickness of the nozzle gasket 4 is 1.0 mm, the thickness of the filter gasket 5 is 0.6 mm, and the thickness of the pre-spinning gasket 6 and the positioning gasket 7 is 0.7 mm.

[0046] The production and testing procedures in this embodiment differ from those in Embodiment 1 in that: ① The viscosity of the spinning solution was adjusted to 6000 cP, the stretching ratio was 3.2 times, and the winding speed was 120 m / min.

[0047] ② Performance of the finished product in this embodiment: 50D / 4F flat yarn cross-section asymmetry rate of 2.5%, dry breaking strength of 2.9cN / dtex, no leakage after 1000h of continuous production, zero spinneret blockage rate, meeting the requirements of high-end home textile fabrics.

[0048] Example 3 A continuous spinning spinneret structure for preparing flat filaments includes a spinneret 2, the tail end of which is fitted inside a spinneret nut 1, and the head end of the spinneret 2 protruding from the head end face of the spinneret nut 1. Spinning holes 9 are evenly distributed on the head end face of the spinneret 2, arranged in a rotationally symmetrical manner around the center of the head end. A pre-spinning filter 3, with a clearance fit, is fitted inside the spinneret nut 1 near the end of the spinneret 2. A spinneret washer 4, fitting against the end of the spinneret nut 1, is fitted on the side of the spinneret 2 near the spinneret nut 1. A filter washer 5, fitting against the side of the spinneret 2, is fitted on the side of the pre-spinning filter 3 near the spinneret 2. A pre-spinning washer 6 is provided on the side of the pre-spinning filter 3 away from the spinneret 2.

[0049] The spinneret 2 is fixed to the head end of the spinneret nut 1 by means of a spinneret washer 4 and a threaded clamping method. The head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. The pre-spinning filter 3 is fixed inside the spinneret nut 1 by means of a filter washer 5 and a threaded clamping method. The filter surface of the pre-spinning filter 3 mates with the spinneret 2. It is then fixed inside the spinneret nut 1 by means of a pre-spinning washer 6 and a threaded clamping method, forming a support for the pre-spinning filter 3, thus realizing the installation of this spinneret structure.

[0050] Example 4 A continuous spinning spinneret structure for preparing flat filaments includes a spinneret 2, the tail end of which is fitted inside a spinneret nut 1, and the head end of the spinneret 2 protruding from the head end face of the spinneret nut 1. Spinning holes 9 are evenly distributed on the head end face of the spinneret 2, arranged in a rotationally symmetrical manner around the center of the head end. A pre-spinning filter 3, with a clearance fit, is fitted inside the spinneret nut 1 near the end of the spinneret 2. A spinneret washer 4, fitting against the end of the spinneret nut 1, is fitted on the side of the spinneret 2 near the spinneret nut 1. A filter washer 5, fitting against the side of the spinneret 2, is fitted on the side of the pre-spinning filter 3 near the spinneret 2. A pre-spinning washer 6 is located on the side of the pre-spinning filter 3 away from the spinneret 2, and a positioning washer 7 is located on the side of the pre-spinning washer 6 away from the pre-spinning filter 3.

[0051] The spinneret 2 is fixed to the head end of the spinneret nut 1 by the spinneret washer 4 through threaded clamping. The head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. The pre-spinning filter screen 3 is fixed inside the spinneret nut 1 by the filter washer 5 through threaded clamping. The filter surface of the pre-spinning filter screen 3 mates with the spinneret 2. It is then fixed inside the spinneret nut 1 by the pre-spinning washer 6 through threaded clamping, forming a support for the pre-spinning filter screen 3. Finally, the positioning washer 7 is used to provide auxiliary support for the pre-spinning filter screen 3 through the pre-spinning washer 6 through threaded clamping, thus realizing the installation of this spinneret structure.

[0052] Example 5 A continuous spinning spinneret structure for preparing flat filaments, the structure of which is as follows: Figure 1-3As shown, the spinneret 2 is included. The tail end of the spinneret 2 is fitted inside the spinneret nut 1, and the head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. Spinning holes 9 are evenly distributed on the head end face of the spinneret 2, which are symmetrically arranged around the center of the head end of the spinneret 2. A pre-spinning filter screen 3 is fitted inside the spinneret nut 1 near the end of the spinneret 2, which is in clearance fit with the spinneret 2. A spinneret washer 4 is fitted on the side of the spinneret 2 near the spinneret nut 1, which fits against the end of the spinneret nut 1. A filter washer 5 is fitted on the side of the pre-spinning filter screen 3 near the spinneret 2, which fits against the side of the spinneret 2.

[0053] The spinneret structure 9 includes a rectangular spinneret hole 10 formed on the end face of the spinneret head 2, with arc-shaped guide grooves 11 symmetrically formed on the long side of the rectangular spinneret hole 10. The spinneret head 2 has a conical diversion cavity 8 communicating with the spinneret hole, and the spinneret head 2 protrudes from the end face of the spinneret nut 1 through a nozzle hole provided on the nozzle nut 1. A spinning pre-filter 3 is provided on the side away from the spinneret head 2, and a positioning washer 7 is provided on the side of the spinning pre-filter 3 away from the spinning pre-filter 3.

[0054] The spinneret 2 is fixed to the head end of the spinneret nut 1 by threaded clamping via the spinneret washer 4. The cylindrical surface of the spinneret 2 is aligned with the inner hole of the spinneret nut 1 and inserted, so that the head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. The pre-spinning filter 3 is fixed inside the spinneret nut 1 by threaded clamping via the filter washer 5. The filter surface of the pre-spinning filter 3 mates with the spinneret 2. It is then fixed inside the spinneret nut 1 by threaded clamping via the pre-spinning washer 6, forming a support for the pre-spinning filter 3. Finally, the positioning washer 7 is used to provide auxiliary support for the pre-spinning filter 3 by threaded clamping via the pre-spinning washer 6, thus realizing the installation of this spinneret structure.

[0055] In this embodiment, the spinning solution is first filtered through the pre-spinning filter screen 3 along the nozzle nut 1, and then enters the conical diversion cavity 8 of the spinneret 2 for uniform diffusion. It then enters the rectangular spinneret hole 10 and the arc-shaped guide groove 11 of the spinneret hole structure 9 for extrusion. After extrusion, it is solidified in an acid bath, stretched by rollers, washed, dried, and wound to obtain flat yarn.

[0056] Example 6 A continuous spinning spinneret structure for preparing flat filaments, the structure of which is as follows: Figure 1-3As shown, the spinneret 2 is included. The tail end of the spinneret 2 is fitted inside the spinneret nut 1, and the head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. Spinning holes 9 are evenly distributed on the head end face of the spinneret 2, which are symmetrically arranged around the center of the head end of the spinneret 2. A pre-spinning filter screen 3 is fitted inside the spinneret nut 1 near the end of the spinneret 2, which is in clearance fit with the spinneret 2. A spinneret washer 4 is fitted on the side of the spinneret 2 near the spinneret nut 1, which fits against the end of the spinneret nut 1. A filter washer 5 is fitted on the side of the pre-spinning filter screen 3 near the spinneret 2, which fits against the side of the spinneret 2.

[0057] The spinneret structure 9 includes a rectangular spinneret hole 10 formed on the end face of the spinneret head 2, and an arc-shaped guide groove 11 symmetrically formed on the long side of the rectangular spinneret hole 10. The spinneret head 2 is provided with a conical flow-dividing cavity 8 that communicates with the spinneret hole, and the spinneret head 2 protrudes from the end face of the spinneret nut 1 through the nozzle hole provided on the nozzle nut 1.

[0058] A spinning pre-filter 3 is provided with a spinning pre-washer 6 on the side away from the spinneret 2, and a positioning washer 7 is provided on the side of the spinning pre-filter 6 away from the spinning pre-filter 3. The spinneret washer 4, filter washer 5, spinning pre-washer 6 and positioning washer 7 are all connected to the inner wall of the spinneret nut 1 by the threads on their outer circumferences.

[0059] The spinneret 2 is fixed to the head end of the spinneret nut 1 by the spinneret washer 4 through threaded clamping, so that the head end of the spinneret 2 protrudes from the head end face of the spinneret nut 1. The pre-spinning filter screen 3 is fixed inside the spinneret nut 1 by the filter washer 5 through threaded clamping. The filter surface of the pre-spinning filter screen 3 mates with the spinneret 2. It is then fixed inside the spinneret nut 1 by the pre-spinning washer 6 through threaded clamping, forming a support for the pre-spinning filter screen 3. Finally, the positioning washer 7 is used to provide auxiliary support for the pre-spinning filter screen 3 through the pre-spinning washer 6 through threaded clamping, thus realizing the installation of this spinneret structure.

[0060] In this embodiment, the spinning solution is first filtered through the pre-spinning filter screen 3 along the nozzle nut 1, and then enters the conical diversion cavity 8 of the spinneret 2 for uniform diffusion. It then enters the rectangular spinneret hole 10 and the arc-shaped guide groove 11 of the spinneret hole structure 9 for extrusion. After extrusion, it is solidified in an acid bath, stretched by rollers, washed, dried, and wound to obtain flat yarn.

[0061] The above description is only a preferred embodiment of the present utility model, but is not limited to the above examples. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A continuous spinning spinneret structure for preparing flat filaments, comprising a spinneret, characterized in that, The tail end of the spinneret is fitted inside the spinneret nut, and the head end of the spinneret protrudes from the head end face of the spinneret nut. The head end face of the spinneret has a rectangular spinneret hole structure that is rotationally symmetrical around the center of the head end of the spinneret. A pre-spinning filter screen with clearance fit is fitted inside the spinneret nut at one end. A spinneret washer that fits against the end of the spinneret nut is fitted on the side of the spinneret near the spinneret nut. A filter washer that fits against the side of the spinneret is fitted on the side of the pre-spinning filter screen near the spinneret.

2. The continuous spinning spinneret structure for preparing flat filaments according to claim 1, characterized in that, The spinneret structure includes a rectangular spinneret hole formed on the end face of the spinneret head, and an arc-shaped guide groove is symmetrically formed on the long side of the rectangular spinneret hole.

3. The continuous spinning spinneret structure for preparing flat filaments according to claim 1, characterized in that, The spinneret has a conical flow divider cavity that communicates with the spinneret hole, and the spinneret protrudes from the head end face of the spinneret nut through the spinneret hole provided on the spinneret nut.

4. The continuous spinning spinneret structure for preparing flat filaments according to claim 1, characterized in that, The spinning pre-filter is provided with a spinning pre-waist on the side away from the spinneret, and a positioning washer is provided on the side of the spinning pre-waist that is away from the spinning pre-filter; the spinneret is provided with a filter mounting groove that cooperates with the spinning pre-filter.

5. The continuous spinning spinneret structure for preparing flat filaments according to claim 4, characterized in that, The nozzle washer, filter washer, pre-spinning washer, and positioning washer are all connected to the inner wall of the nozzle nut by the outer circumference thread; the nozzle washer, filter washer, pre-spinning washer, and positioning washer are all hollow frustum-shaped.

6. The continuous spinning spinneret structure for preparing flat filaments according to claim 1, characterized in that, The pre-spinning filter is a 200-300 mesh metal wire mesh.

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