A method of fiber thread drawing

Abstract

The application provides a fiber thread drawing upper frame method, comprising the following steps: step S1: installing a spinning assembly above the liquid surface of a coagulation bath tank, and spinning the spinning assembly; step S2: threading the yarn through a deflection roller at the bottom of the coagulation bath tank, and then drawing the yarn out of the coagulation bath tank; step S3: after the yarn is drawn out of the coagulation bath tank, lowering the height of the spinning assembly to H2 above the liquid surface, and leading the yarn to a driving drawing roller outside the coagulation bath tank; step S4: after the yarn is threaded through the driving drawing roller, lowering the height of the spinning assembly to H3 above the liquid surface again, and leading the yarn to a guide frame of a processing procedure; and step S5: collecting the yarn. The application gradually lowers the height of the spinning assembly in stages, which can reduce the risk of siphon of the spinning assembly, and improve the spinning continuity of the spinning assembly.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber processing technology, specifically relating to a method for fiber drawing and mounting. Background Technology

[0002] Polyacrylonitrile-based carbon fibers combine high performance with low density. In recent years, the demand for lower carbon fiber costs has become more urgent, leading to the rapid development of efficient and low-cost dry-jet wet spinning technology.

[0003] The processing of polyacrylonitrile (PA) fiber, the precursor of carbon fiber, requires a spinneret assembly, which consists of a spinneret head, a filter layer, and a spinneret plate. The stability of the spinneret plate is a bottleneck restricting carbon fiber quality. Issues such as runaway, siphoning, raining, and material clumping can disrupt the spinneret's stable operation, necessitating replacement. Frequent spinneret plate replacements, coupled with a low success rate, and the high speed of dry-jet wet spinning, with typically over 60 spinnerets in the coagulation bath and small spacing between spinnerets, present challenges for coagulation bath fiber drawing, pulling, and carrying operations after spinneret plate replacement. Frequent backwinding during the fiber pulling and mounting process after plate replacement further contributes to low carbon fiber yield and quality. Therefore, researching methods to improve spinneret plate stability, reduce replacement frequency, and ensure safe and efficient fiber pulling and mounting operations after spinneret plate replacement is crucial for safe production and increased output of dry-jet wet-spun PA fiber.

[0004] The existing production operation method mainly involves immersing the spinneret 1-5mm below the liquid surface of the coagulation bath after it is installed, tying the filaments spun by the spinneret with cotton rope, leading them out of the coagulation bath to the active pull-out roller outside the coagulation bath, and raising the height of the spinneret until it reaches the designated height above the liquid surface before fixing it. This method easily affects the spinneret's spinning stability, causing discontinuous spinning and breakage. Summary of the Invention

[0005] Therefore, the present invention provides a fiber drawing and mounting method, the main technical problem to be solved is: how to improve the spinning stability of the spinneret assembly, so that the spinneret assembly can continuously spin and reduce fiber breakage.

[0006] To address the above problems, the present invention provides a method for fiber drawing and mounting, comprising the following steps:

[0007] Step S1: Install the spinneret above the liquid surface in the coagulation bath to allow the spinneret to spin filaments.

[0008] Step S2: Pass the filament bundle around the deflector roller at the bottom of the coagulation bath, and then pull the filament bundle out of the coagulation bath;

[0009] Step S3: After pulling the filament bundle out of the coagulation bath, lower the height of the spinneret to H2 above the liquid surface and guide the filament bundle to the active pull-out roller outside the coagulation bath.

[0010] Step S4: After the filament bundle passes through the active pull-out roller, the height of the spinneret assembly is lowered again to H3 above the liquid surface, and the filament bundle is guided to the guide frame of the processing step.

[0011] Step S5: Take in the filament bundle.

[0012] In some embodiments, in step S1, the spinneret assembly first spins filaments at a higher height, and after all the spinnerets of the spinneret assembly have continuously spinned filaments, the height of the spinneret assembly is lowered to H1 above the liquid surface.

[0013] In some embodiments, step S01 is included before step S1: heat the spinneret assembly in a vacuum environment at 30-70°C for 15-45 minutes;

[0014] And / or, before step S1, step S02 is also included: feeding material to each spinneret of the spinneret assembly, checking whether each spinneret can continuously discharge material without material blocks; if a spinneret discharges material with material blocks or the spinneret is discontinuous, then the spinneret that discharges material with material blocks or the spinneret is discontinuous is repaired so that it can continuously discharge material without material blocks.

[0015] In some implementations, in step S3, after lowering the height of the spinneret assembly, the filament bundle needs to be drawn to the active pull-out roller at a faster drawing speed.

[0016] In some embodiments, the guide frames of two adjacent spinning positions are respectively designated as the first guide frame and the second guide frame; if a filament breaks on the first guide frame, the broken filament is pulled to the second guide frame and fixed to the filament bundle on the second guide frame, so that the filament bundle on the second guide frame moves forward together with the broken filament.

[0017] In some embodiments, the method for fixing the broken wire to the wire bundle on the second wire guide is as follows:

[0018] Pass the broken wire around the second wire guide frame and pull it in the opposite direction; then fix the broken wire bundle on the upstream side of the second wire guide frame to the wire bundle on the second wire guide frame; then cut off the excess broken wire at the fixing point.

[0019] In some embodiments, before taking the filament bundle in step S5, the filament bundle is first led to the steam drawing device, the steam drawing device heats and draws the filament bundle, and then the filament bundle led out by the steam drawing device is taken up.

[0020] In some embodiments, the winding of the filaments drawn out by the steam drawing device specifically involves:

[0021] First, the temperature of the filament bundle drawn from the steam drawing device is detected. The filament bundle is then wound up after the temperature of the filament bundle is greater than or equal to the preset temperature for a preset time period. The filament bundle that has not reached the temperature standard is then cut off.

[0022] In some embodiments, a temperature detection device is used to detect the temperature of the filament bundle drawn from the steam drawing device, and a filament suction device is used to pull the filament bundle while detecting the temperature.

[0023] The process involves cutting the filament bundle in front of the temperature detection device after it reaches the preset temperature, thus cutting off the filament bundle before the temperature reaches the target. Then, a suction device is used to suck up the cut filament bundle and guide it to the take-up machine for take-up.

[0024] In some embodiments, in step S5, after the filament bundle is led to the steam drawing device, a steel wire is used to guide the filament bundle through the channel of the steam drawing device, so that the steam drawing device heats the filament bundle in the channel; wherein, after the filament bundle passes through the channel of the steam drawing device, the filament bundle is detached from the steel wire.

[0025] In some implementations, the filament bundle is first led to the suction device of the suction station for a transition stop before being led to the steam drawing device.

[0026] The fiber drawing and mounting method provided by this invention has the following beneficial effects:

[0027] 1. This invention reduces the height of the spinneret assembly in stages, and then gradually reduces the height of the spinneret assembly after each stage has stabilized. This can reduce the risk of siphoning in the spinneret assembly and improve the continuity of spinneret spinning, thereby reducing the phenomenon of filament breakage and achieving stable continuous spinneret spinning.

[0028] 2. The present invention uses adjacent spinning positions to carry yarn, which is more convenient and faster, reduces process fluctuations caused by yarn carrying process, and improves yarn carrying efficiency and success rate.

[0029] 3. This invention detects the temperature of the filament bundle before winding. If the temperature of the filament bundle drawn out by the steam drawing device does not meet the standard, that is, the drawing time after steam is introduced into the steam drawing device is too short and the steam does not fully wet the filament bundle, the filament bundle is prone to backtangling or breakage if it is wound up on the rack.

[0030] 4. In this invention, a wire suction device is used to pull the wire bundle when detecting the temperature of the wire bundle and when the wire bundle is placed on the rack for winding. This can avoid the risk of burns and tangling caused by manual pulling of the wire. Attached Figure Description

[0031] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0032] Figure 1 This is a flowchart of the fiber drawing and mounting method of the present invention;

[0033] Figure 2 This is a schematic diagram of the filaments being pulled out of the coagulation tank;

[0034] Figure 3 This is a schematic diagram showing the yarns from adjacent spinning positions;

[0035] Figure 4 This is a schematic diagram reflecting another perspective of the yarn at adjacent spinning positions;

[0036] Figure 5 This is a structural block diagram of a wire-suction device used to pull the wire bundle when performing temperature detection on the wire bundle.

[0037] The attached figures are labeled as follows:

[0038] 1. Fiber bundle; 2. Fiber guide frame; 3. Directional roller; 4. Fixing point; 5. Active pull-out roller; 6. Coagulation bath; 7. Liquid level; 8. Steam drawing device; 9. Temperature detection device; 10. Spinneret assembly; 11. Dryer; 12. Fiber suction device; 13. Drive roller; 14. Fiber take-up machine; 20. Feed pipe; 21. First fiber guide frame; 22. Second fiber guide frame; 31. Broken fiber; 32. Fiber bundle on the second fiber guide frame. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0041] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0042] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0043] See also Figure 1-2 As shown, according to an embodiment of the present invention, a method for fiber drawing and mounting is provided, characterized by comprising the following steps:

[0044] Step S1: Install the spinneret 10 above the liquid surface 7 of the coagulation bath so that the spinneret 10 spins filaments.

[0045] In step S1, the spinneret 10 can initially spin filaments at a relatively high height. After all the spinnerets of the spinneret 10 are continuously spinning filaments, the height of the spinneret 10 is lowered to H1 above the liquid surface 7. The higher the spinneret 10 is above the liquid surface 7 of the coagulation bath, the more likely it is to experience discontinuous spinning and flow interruption. Therefore, lowering the height after all the spinnerets of the spinneret 10 are continuously spinning filaments effectively reduces the occurrence of filament breakage 31.

[0046] Step S2: Pass the filament bundle 1 around the turning roller 3 at the bottom of the coagulation bath 6, and then pull the filament bundle 1 out of the coagulation bath 6.

[0047] In step S2, the drawing speed at which the filament bundle 1 is pulled out of the coagulation bath 6 is V1, where V1 = V2 ± 1.5, and V2 refers to the spinning speed of the spinneret 10. The units of V1 and V2 are both m / min. In some embodiments, V2 is 6-12 m / min.

[0048] In step S2, if the drawing speed is too fast, the fiber bundle 1 is easily thinned and gradually broken; if the drawing speed is too slow, the fiber is prone to becoming thicker, getting caught on the roller, or accumulating in the coagulation bath 6, resulting in filament breakage 31. The present invention designs the drawing speed V1 = V2 ± 1.5, so that the drawing speed V1 can match the spinning speed V2 of the spinneret assembly 10, thereby reducing the risk of filament breakage 31, thickening, roller catching, and accumulation.

[0049] Step S3: After pulling the filament bundle 1 out of the coagulation bath 6, lower the height of the spinneret 10 to H2 above the liquid surface 7, and guide the filament bundle 1 to the active pull-out roller 5 outside the coagulation bath 6.

[0050] In step S3, after the filament bundle 1 is pulled out from the coagulation bath 6, the filament bundle 1 ends the drawing stage in the coagulation bath 6 and the filament bundle 1 will enter the next stage of winding around the active pull-out roller 5. At this time, the height of the spinneret 10 is reduced, which helps to leave a margin for the filament bundle to wind around the active pull-out roller, making it easier for the operator to drive the filament bundle to wind around the active pull-out roller. This can effectively reduce the phenomenon of filament breakage 31.

[0051] It should be noted that in step S3, after lowering the height of the spinneret 10, the filament bundle 1 needs to be drawn to the active pull roller 5 at a faster drawing speed. The main purpose of this design is that if the drawing speed is too slow, the filament bundle 1 may not be able to be drawn to the active pull roller 5 smoothly, or the filament bundle 1 may even become entangled.

[0052] In some embodiments, the drawing speed at which the filament bundle 1 is led to the active pull-out roller 5 in step S3 is V1', where V1' = V2 + a, and a = 2.5-3.5. Preferably, a = 3. The units of V1' and V2 are both m / min. By limiting V1' to V2 + a, excessively fast drawing speeds can prevent large disturbances. Otherwise, if the drawing speed is too fast, it can easily cause large fluctuations in the liquid level within the coagulation bath 6, leading to siphoning in the spinneret 10.

[0053] Step S4: After the filament bundle 1 passes over the active pull-out roller 5, the height of the spinneret 10 is lowered again to H3 above the liquid surface 7, and the filament bundle 1 is guided to the guide frame 2 of the processing step. A wire guide fork can be used to assist the filament bundle 1 in passing through the guide frame 2.

[0054] In step S4, after the filament bundle 1 passes through the active pull-out roller 5, the stage of the filament bundle passing through the active pull-out roller ends, and the filament bundle 1 will enter the next stage of passing through the guide frame 2. At this time, lowering the height of the spinneret assembly is beneficial to leave a margin for the filament bundle 1 to pass through the guide frame 2, making it easier for the operator to drive the filament bundle 1 to pass through the guide frame 2. This can effectively reduce the phenomenon of filament breakage 31.

[0055] Step S5: Take in the filament bundle.

[0056] In the above example, the initial spinning process of the filament bundle 1 is divided into three stages: the initial spinning stage of the spinneret assembly, the filament bundle exiting the coagulation bath stage, and the filament bundle winding around the active pull-out roller stage. After each of these three stages stabilizes, the height of the spinneret assembly 10 is reduced slightly. Specifically, in the initial spinning stage, once all the spinnerets of the spinneret assembly 10 have continuously spun filaments, it indicates that this stage has stabilized, and the height of the spinneret assembly 10 can be reduced to H1 above the liquid surface 7. Then, in the filament bundle exiting the coagulation bath stage, after the operator stably pulls the filament bundle 1 out of the coagulation bath 6, it indicates that this stage has also stabilized, and the height of the spinneret assembly 10 can be reduced a second time to H2 above the liquid surface 7. Finally, in the filament bundle winding around the active pull-out roller stage, the operator winds the filament bundle 1 around the active pull-out roller 5. Once the filament bundle 1 stably exits from the active pull-out roller 5, it indicates that this stage has also stabilized, and the height of the spinneret assembly 10 can be reduced again to H3 above the liquid surface 7.

[0057] The closer the spinneret 10 is to the liquid surface 7 of the coagulation bath, the more susceptible it is to siphoning due to fluctuations in the liquid surface 7, affecting the spinneret 10's spinning stability. While a greater distance reduces the risk of siphoning, it also increases the likelihood of discontinuous spinning and flow interruptions. This invention addresses this by gradually lowering the height of the spinneret 10 in stages, stabilizing at each stage before further reduction. This approach reduces the risk of siphoning while improving spinning continuity. Once the filament bundle 1 has passed over the guide frame 2 and is far from the coagulation bath 6, it no longer causes fluctuations in the liquid surface 7. At this point, the spinneret 10 can be lowered to its lowest point above the liquid surface 7, such as H3 above the liquid surface 7.

[0058] The above-mentioned method of gradually reducing the height of the spinneret 10 in stages can reduce the phenomenon of filament breakage 31, make the spinneret 10 more stable, and achieve stable continuous spinnereting.

[0059] The aforementioned H1 > H2 > H3. In some embodiments, H1 ≤ 20 mm, H2 ≤ 10 mm, and H3 is 2-5 mm.

[0060] In some implementations, such as Figure 1 As shown, the aforementioned step S1 may further include step S01: keeping the spinneret 10 in a vacuum environment at 30-70°C for 15-45 minutes. Specifically, a vacuum drying oven can be used to provide the vacuum environment.

[0061] In step S01, drying the spinneret 10 can reduce the humidity of the spinneret 10 and increase its temperature. If the spinneret 10 is damp or the temperature is too low, the polyacrylonitrile solution will easily flow and smear or become discontinuous when it is ejected from the low-temperature spinneret 10 due to its high temperature.

[0062] In some embodiments, step S02 may be included before step S1: feeding material into each spinneret of the spinneret assembly 10, for example, by using a metering pump to feed material into each spinneret of the spinneret assembly 10 through a feed pipe 20. Check whether each spinneret can continuously discharge material without material blocks. If a spinneret discharges material blocks or the spinning is discontinuous, the spinneret with material blocks or the discontinuous spinning is repaired to enable continuous material discharge without material blocks. Specifically, an alcohol syringe can be used to repair the spinneret with material blocks or the discontinuous spinning. When repairing the spinneret, the alcohol syringe is inserted into the spinneret, and the angle between the alcohol syringe and the center line of the spinneret is 30°-60°.

[0063] In the above example, if the spinneret discharges material blocks or the spinneret is discontinuous, it indicates that the spinneret needs to be repaired. Otherwise, the spinneret is prone to material blocks, discontinuity, or no material output, affecting performance indicators such as fiber linear density, and is prone to fiber breakage 31 and roller entanglement.

[0064] In some implementations, such as Figure 3 and Figure 4 As shown, the guide frames 2 of two adjacent spinning positions are respectively taken as the first guide frame 21 and the second guide frame 22. If a broken filament 31 occurs in the filament bundle 1 on the first guide frame 21, the broken filament 31 is pulled to the second guide frame 22 and fixed to the filament bundle 32 on the second guide frame, so that the filament bundle 32 on the second guide frame moves forward together with the broken filament 31.

[0065] In existing technologies, yarn is typically pulled manually. This requires opening the washing tank cover, affecting the accuracy of washing temperature control. Furthermore, manual pulling can break adjacent yarn bundles 1 on the walking / operating side, and the manual pulling speed is slow and inefficient. In contrast, in the example above, if a yarn bundle 1 on one guide frame 2 breaks, the broken yarn 31 can be connected to a yarn bundle 1 on an adjacent guide frame 2, allowing the yarn bundle 1 on the adjacent guide frame 2 to move forward with the broken yarn 31. Using adjacent spinning positions for yarn pulling is more convenient and faster, reduces process fluctuations caused by the yarn pulling process, and improves yarn pulling efficiency and success rate.

[0066] In some embodiments, the aforementioned method for fixing the broken wire 31 to the wire bundle 32 on the second wire guide can be as follows: Figure 3 As shown, the broken filament 31 is threaded around the second guide frame 22 and pulled in the opposite direction to prevent it from getting tangled or caught, thus affecting adjacent spinning positions. Then, the broken filament bundle upstream of the second guide frame 22 is fixed to the filament bundle 32 on the second guide frame. A 15-30cm length of the broken filament 31 can be cut from its tail and tied tightly to the bundle 32 on the second guide frame 22. Finally, any excess broken filament at the fixing point 4 is cut off. The knotted end should be ≤5cm to prevent filament snagging or affecting adjacent spinning positions during the spinning process.

[0067] like Figure 3 As shown, the direction of the filament bundle 1 is direction a, and the direction of the reverse filament pulling is direction b. Direction a and direction b are opposite.

[0068] In some embodiments, before winding the filament bundle in step S5, the filament bundle 1 is first led to the steam drawing device 8, where the steam drawing device 8 heats and draws the filament bundle 1, and then the filament bundle 1 drawn out by the steam drawing device 8 is wound up. The steam drawing device 8 draws the filament bundle, providing forward propulsion and improving fiber orientation.

[0069] The above-mentioned winding of the filament bundle 1 drawn from the steam drawing device 8 is specifically as follows: Figure 5 First, the temperature of the filament bundle 1 drawn from the steam drawing device 8 is detected. After the temperature of the filament bundle 1 is greater than or equal to the preset temperature for a preset time period, the filament bundle 1 is wound up and cut before the temperature reaches the standard.

[0070] In the above example, the temperature of the filament bundle 1 is detected before winding. If the temperature of the filament bundle 1 drawn out by the steam drawing device 8 is not up to standard, that is, the drawing time after steam is introduced into the steam drawing device 8 is too short and the steam does not completely wet the filament bundle 1, then if the filament bundle 1 is wound up on the rack, it is easy for it to become tangled or break. The preset temperature mentioned above is greater than or equal to 50°C.

[0071] In some embodiments, a temperature detection device 9 can be used to detect the temperature of the filament bundle 1 drawn from the steam drawing device 8. During temperature detection, a filament suction device 12 can be used to pull the filament bundle 1. Once the temperature of the filament bundle 1 reaches a preset temperature, it is cut in front of the temperature detection device 9 to cut the filament bundle before the temperature reaches the target. Then, the filament suction device 12 sucks in the cut filament bundle and guides it to the take-up machine 14 for take-up, thus completing the drawing and mounting of the filament bundle 1. Specifically, the filament suction device 12 guides the filament bundle 1 to the take-up machine 14 as follows: the filament suction device 12 brings the filament bundle 1 into the roller of the take-up machine 14, and winds the filament bundle 1 several times along the rotation direction of the roller before cutting it to prevent the filament bundle 1 from detaching from the roller.

[0072] In the above example, since the suction device 12 is used to absorb the yarn during both temperature detection and shelving processes, the risks of burns and tangling caused by manual yarn pulling can be avoided. The temperature detection device 9 can monitor the temperature of the yarn bundle 1 in real time.

[0073] It should be noted here that: (as...) Figure 5 As shown, a drive roller 13 may be provided on the upstream side of the above-mentioned take-up machine 14. The filament bundle 1 first passes through the drive roller 13 and then is introduced into the take-up machine 14 for take-up.

[0074] The aforementioned silk-suction device 12 can be a silk-suction tube, etc. The silk-suction tube uses compressed air to draw in the silk. The aforementioned temperature detection device 9 can be a temperature detection chamber, which uses infrared temperature measurement.

[0075] In some embodiments, when the aforementioned suction device 12 is used to pull the yarn bundle 1 for temperature detection, a drying mechanism may also be provided between the suction device 12 and the temperature detection device 9. The drying mechanism is used to dry the yarn bundle 1 between the temperature detection device 9 and the suction device to facilitate the suction device 12 in picking up the yarn. The drying mechanism may be a dryer 11, etc. The dryer 11 is driven by a motor and uses strong air drying.

[0076] It should be noted that the aforementioned steam drawing device 8 can be a steam drawing furnace, etc. The aforementioned temperature detection device 9, dryer 11, and suction device 12 form a suction temperature detection assembly. There can be two suction temperature detection assemblies, which are arranged side by side on the downstream side of the steam drawing device 8. Preferably, the two suction temperature detection assemblies are distributed on both sides of the steam drawing device 8 at a 30°-60° angle. The temperature detection device 9, dryer 11, and suction device 12 within each suction temperature detection assembly are all set at the same height and are all at least 10 cm higher than the steam heating device.

[0077] In some embodiments, after the filament bundle 1 is led to the steam drawing device 8, a steel wire can be used to guide the filament bundle 1 through the channel of the steam drawing device 8, so that the steam drawing device 8 heats the filament bundle 1 in the channel. After the filament bundle 1 passes through the channel of the steam drawing device 8, it is then detached from the steel wire.

[0078] In the above example, the front end of the wire with thread typically has a teardrop-shaped, narrow eyelet for easy threading, with an eyelet diameter ≤ 3mm. If the eyelet diameter is too large, the wire will not be able to pass smoothly through the steam drawing device 8 and may easily scratch the sealing components inside the device. If the eyelet diameter is too small, threading will be time-consuming and laborious, and the wire bundle 1 may be frayed during the threading process, hindering the smooth extraction of the wire from the steam drawing device 8. Because the eyelet diameter is small, using a wire can assist the wire bundle 1 in passing through the channel.

[0079] In this process, after the yarn bundle 1 is pulled out of the channel of the steam drawing device 8 using a steel wire, it can be lifted and pulled out from above the yarn bundle 1, the tail of the yarn bundle is cut off, and the yarn bundle 1 is pulled out of the channel of the steam drawing device 8, separating it from the steel wire. Then, the yarn bundle 1 is passed sequentially through the subsequent temperature detection device 9, dryer 11, and yarn suction device 12, and the waste yarn falls into the mesh bag. After the yarn bundle 1 is taut, the steam drawing device 8 is started, so that steam heats the yarn bundle 1 in the channel.

[0080] In some embodiments, before leading the yarn bundle 1 to the steam drawing device 8, the yarn bundle 1 can be temporarily stopped at the yarn suction device of the yarn suction station to facilitate the operator's preparation for the yarn bundle 1 to pass through the steam drawing device 8. After the preparation is completed, the yarn bundle 1 at the yarn suction station is cut and the yarn bundle 1 is led to the steam drawing device 8. The yarn suction device 12 at the yarn suction station is used to pick up the yarn bundle 1.

[0081] By applying the method of this invention to draw and load fibers onto the frame, the spinneret plate and filament of the spinneret assembly 10 can be replaced efficiently, conveniently, and safely. The stability of the spinneret assembly 10 plate surface is improved, and phenomena such as siphoning and overflow caused by filament disturbance are avoided. Back-winding caused by mismatched drawing speed is avoided, and filament breakage and roller entanglement caused by filament loading and mounting are eliminated. At the same time, waste filament generated during the drawing process is minimized, improving work efficiency and reducing process fluctuations caused by filament loading. Furthermore, the process of loading filaments onto the frame through the furnace reduces the risk of burns to personnel, further reducing back-winding and improving mounting efficiency.

[0082] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A method for fiber drawing and mounting, characterized in that: Includes the following steps: Step S1: Install the spinneret (10) above the liquid surface (7) of the coagulation bath so that the spinneret (10) can spin filaments; In step S1, the spinneret (10) first spins filaments at a higher height, and after all the spinnerets of the spinneret (10) have continuously spin filaments, the height of the spinneret (10) is lowered to H1 above the liquid surface (7); Step S2: Pass the filament bundle (1) around the guide roller (3) at the bottom of the coagulation bath (6), and then pull the filament bundle (1) out of the coagulation bath (6); In step S2, the filament pulling speed of the filament bundle (1) out of the coagulation bath (6) is V1, V1=V2±1.5, V2 refers to the filament spinning speed of the spinneret assembly (10), and the units of V1 and V2 are both m / min; Step S3: After pulling the filament bundle (1) out of the coagulation bath (6), lower the height of the spinneret assembly (10) to H2 above the liquid surface (7), and guide the filament bundle (1) to the active pull-out roller (5) outside the coagulation bath (6); wherein, the filament pulling speed of guiding the filament bundle (1) to the active pull-out roller (5) is V1', V1'= V2+a, a=2.5-3.5, and the unit of V1' is m / min; Step S4: After the filament bundle (1) passes through the active pull-out roller (5), the height of the spinneret assembly (10) is lowered again to H3 above the liquid surface (7), and the filament bundle (1) is guided to the guide frame (2) of the processing process. Step S5: Take in the filament bundle.

2. The fiber drawing and mounting method according to claim 1, characterized in that: Before step S1, step S01 is also included: keeping the spinneret assembly (10) in a vacuum environment of 30-70°C for 15-45 minutes; And / or, before step S1, step S02 is also included: feeding material to each spinneret hole of the spinneret assembly (10), checking whether each spinneret hole can continuously discharge material without material blocks; if a spinneret hole discharges material with material blocks or the spinneret is discontinuous, the spinneret hole that discharges material with material blocks or the spinneret is discontinuous is repaired so that it can continuously discharge material without material blocks.

3. The fiber drawing and mounting method according to claim 1, characterized in that: The guide frames (2) of two adjacent spinning positions are respectively designated as the first guide frame (21) and the second guide frame (22); if the yarn bundle (1) on the first guide frame (21) breaks, the broken yarn (31) is pulled to the second guide frame (22), and the broken yarn (31) is fixed to the yarn bundle (32) on the second guide frame, so that the yarn bundle (32) on the second guide frame drives the broken yarn (31) forward together.

4. The fiber drawing and mounting method according to claim 3, characterized in that: The method for fixing the broken wire (31) to the wire bundle (32) on the second wire guide is as follows: Pass the broken wire (31) around the second wire guide frame (22) and pull it in the opposite direction; then fix the broken wire bundle on the upstream side of the second wire guide frame (22) to the wire bundle (32) on the second wire guide frame; then cut off the excess broken wire at the fixing point (4).

5. The fiber drawing and mounting method according to any one of claims 1-4, characterized in that: Before taking the filament bundle in step S5, the filament bundle (1) is first led to the steam drawing device (8). The steam drawing device (8) heats and draws the filament bundle (1), and then the filament bundle (1) led out by the steam drawing device (8) is taken in.

6. The fiber drawing and mounting method according to claim 5, characterized in that: The winding of the filament (1) drawn out by the steam drawing device (8) is specifically performed as follows: First, the temperature of the filament bundle (1) drawn from the steam drawing device (8) is detected. After the temperature of the filament bundle (1) is greater than or equal to the preset temperature within a preset time period, the filament bundle (1) is wound up and cut off before the temperature reaches the standard.

7. The fiber drawing and mounting method according to claim 6, characterized in that: A temperature detection device (9) is used to detect the temperature of the filament bundle (1) drawn from the steam drawing device (8). When the temperature of the filament bundle (1) is detected, a filament suction device (12) is used to pull the filament bundle (1). In this process, after the temperature of the filament bundle (1) reaches the preset temperature, the filament bundle is cut off in front of the temperature detection device (9) to cut off the filament bundle before the temperature reaches the standard; then the filament bundle after being cut is sucked in by the filament suction device (12) and the filament bundle (1) is led to the filament take-up machine (14) for take-up.

8. The fiber drawing and mounting method according to claim 5, characterized in that: After the wire bundle (1) is led to the steam drawing device (8), the wire bundle (1) is driven through the channel of the steam drawing device (8) by a steel wire, so that the steam drawing device (8) heats the wire bundle (1) in the channel; wherein, after the wire bundle (1) passes through the channel of the steam drawing device (8), the wire bundle (1) is detached from the steel wire.

9. The fiber drawing and mounting method according to claim 5, characterized in that: Before leading the filament bundle (1) to the steam drawing device (8), the filament bundle (1) is first led to the suction device (12) of the suction station for a transition stop.

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